/* Pango * pango-layout.c: Highlevel layout driver * * Copyright (C) 2000, 2001 Red Hat Software * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include /* For pango_shape() */ #include #include #include #include #include "pango-layout-private.h" #define LINE_IS_VALID(line) ((line)->layout != NULL) typedef struct _Extents Extents; typedef struct _ItemProperties ItemProperties; typedef struct _ParaBreakState ParaBreakState; struct _Extents { /* Vertical position of the line's baseline in layout coords */ int baseline; /* Line extents in layout coords */ PangoRectangle ink_rect; PangoRectangle logical_rect; }; struct _ItemProperties { PangoUnderline uline; gint rise; gint letter_spacing; gboolean shape_set; PangoRectangle *shape_ink_rect; PangoRectangle *shape_logical_rect; }; struct _PangoLayoutIter { PangoLayout *layout; GSList *line_list_link; PangoLayoutLine *line; /* If run is NULL, it means we're on a "virtual run" * at the end of the line with 0 width */ GSList *run_list_link; PangoLayoutRun *run; /* FIXME nuke this, just keep the link */ int index; /* layout extents in layout coordinates */ PangoRectangle logical_rect; /* list of Extents for each line in layout coordinates */ GSList *line_extents; GSList *line_extents_link; /* X position of the current run */ int run_x; /* Extents of the current run */ PangoRectangle run_logical_rect; /* this run is left-to-right */ gboolean ltr; /* X position of the left side of the current cluster */ int cluster_x; /* The width of the current cluster */ int cluster_width; /* glyph offset to the current cluster start */ int cluster_start; /* first glyph in the next cluster */ int next_cluster_glyph; /* number of unicode chars in current cluster */ int cluster_num_chars; /* visual position of current character within the cluster */ int character_position; }; typedef struct _PangoLayoutLinePrivate PangoLayoutLinePrivate; struct _PangoLayoutLinePrivate { PangoLayoutLine line; guint ref_count; }; struct _PangoLayoutClass { GObjectClass parent_class; }; static void pango_layout_clear_lines (PangoLayout *layout); static void pango_layout_check_lines (PangoLayout *layout); static PangoAttrList *pango_layout_get_effective_attributes (PangoLayout *layout); static PangoLayoutLine * pango_layout_line_new (PangoLayout *layout); static void pango_layout_line_postprocess (PangoLayoutLine *line, ParaBreakState *state); static int *pango_layout_line_get_log2vis_map (PangoLayoutLine *line, gboolean strong); static int *pango_layout_line_get_vis2log_map (PangoLayoutLine *line, gboolean strong); static void pango_layout_get_item_properties (PangoItem *item, ItemProperties *properties); static void pango_layout_finalize (GObject *object); G_DEFINE_TYPE (PangoLayout, pango_layout, G_TYPE_OBJECT) static void pango_layout_init (PangoLayout *layout) { layout->attrs = NULL; layout->font_desc = NULL; layout->text = NULL; layout->length = 0; layout->width = -1; layout->indent = 0; layout->alignment = PANGO_ALIGN_LEFT; layout->justify = FALSE; layout->auto_dir = TRUE; layout->log_attrs = NULL; layout->lines = NULL; layout->tab_width = -1; layout->wrap = PANGO_WRAP_WORD; layout->ellipsize = PANGO_ELLIPSIZE_NONE; } static void pango_layout_class_init (PangoLayoutClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); object_class->finalize = pango_layout_finalize; } static void pango_layout_finalize (GObject *object) { PangoLayout *layout; layout = PANGO_LAYOUT (object); pango_layout_clear_lines (layout); if (layout->context) g_object_unref (layout->context); if (layout->attrs) pango_attr_list_unref (layout->attrs); if (layout->text) g_free (layout->text); if (layout->font_desc) pango_font_description_free (layout->font_desc); if (layout->tabs) pango_tab_array_free (layout->tabs); G_OBJECT_CLASS (pango_layout_parent_class)->finalize (object); } /** * pango_layout_new: * @context: a #PangoContext * * Create a new #PangoLayout object with attributes initialized to * default values for a particular #PangoContext. * * Return value: a new #PangoLayout, with a reference count of one. **/ PangoLayout * pango_layout_new (PangoContext *context) { PangoLayout *layout; g_return_val_if_fail (context != NULL, NULL); layout = g_object_new (PANGO_TYPE_LAYOUT, NULL); layout->context = context; g_object_ref (context); return layout; } /** * pango_layout_copy: * @src: a #PangoLayout * * Does a deep copy-by-value of the @src layout. The attribute list, * tab array, and text from the original layout are all copied by * value. * * Return value: a new #PangoLayout identical to @src **/ PangoLayout* pango_layout_copy (PangoLayout *src) { PangoLayout *layout; g_return_val_if_fail (PANGO_IS_LAYOUT (src), NULL); layout = pango_layout_new (src->context); if (src->attrs) layout->attrs = pango_attr_list_copy (src->attrs); if (src->font_desc) layout->font_desc = pango_font_description_copy (src->font_desc); layout->text = g_strdup (src->text); layout->length = src->length; layout->width = src->width; layout->indent = src->indent; layout->spacing = src->spacing; layout->justify = src->justify; layout->auto_dir = src->auto_dir; layout->alignment = src->alignment; layout->n_chars = src->n_chars; layout->tab_width = src->tab_width; if (src->tabs) layout->tabs = pango_tab_array_copy (src->tabs); layout->wrap = src->wrap; layout->ellipsize = src->ellipsize; /* log_attrs, lines fields are updated by check_lines */ return layout; } /** * pango_layout_get_context: * @layout: a #PangoLayout * * Retrieves the #PangoContext used for this layout. * * Return value: The #PangoContext for the layout. This does not * have an additional refcount added, so if you want to keep * a copy of this around, you must reference it yourself. **/ PangoContext * pango_layout_get_context (PangoLayout *layout) { g_return_val_if_fail (layout != NULL, NULL); return layout->context; } /** * pango_layout_set_width: * @layout: a #PangoLayout. * @width: the desired width, or -1 to indicate that no wrapping should be * performed. * * Sets the width to which the lines of the #PangoLayout should be wrapped. **/ void pango_layout_set_width (PangoLayout *layout, int width) { g_return_if_fail (layout != NULL); if (width != layout->width) { layout->width = width; pango_layout_clear_lines (layout); } } /** * pango_layout_get_width: * @layout: a #PangoLayout * * Gets the width to which the lines of the #PangoLayout should be wrapped. * * Return value: the width **/ int pango_layout_get_width (PangoLayout *layout) { g_return_val_if_fail (layout != NULL, 0); return layout->width; } /** * pango_layout_set_wrap: * @layout: a #PangoLayout * @wrap: the wrap mode * * Sets the wrap mode; the wrap mode only has an effect if a width * is set on the layout with pango_layout_set_width(). To turn off wrapping, * set the width to -1. **/ void pango_layout_set_wrap (PangoLayout *layout, PangoWrapMode wrap) { g_return_if_fail (PANGO_IS_LAYOUT (layout)); if (layout->wrap != wrap) { pango_layout_clear_lines (layout); layout->wrap = wrap; } } /** * pango_layout_get_wrap: * @layout: a #PangoLayout * * Gets the wrap mode for the layout. * * Return value: Active wrap mode. **/ PangoWrapMode pango_layout_get_wrap (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), 0); return layout->wrap; } /** * pango_layout_set_indent * @layout: a #PangoLayout. * @indent: the amount by which to indentset * * Sets the width in pango units to indent each paragraph. A negative value * of @indent will produce a hanging indent. That is, the first line will * have the full width, and subsequent lines will be indented by the * absolute value of @indent. **/ void pango_layout_set_indent (PangoLayout *layout, int indent) { g_return_if_fail (layout != NULL); if (indent != layout->indent) { layout->indent = indent; pango_layout_clear_lines (layout); } } /** * pango_layout_get_indent: * @layout: a #PangoLayout * * Gets the paragraph indent width in pango units. A negative value * indicates a hanging indent. * * Return value: the indent **/ int pango_layout_get_indent (PangoLayout *layout) { g_return_val_if_fail (layout != NULL, 0); return layout->indent; } /** * pango_layout_set_spacing: * @layout: a #PangoLayout. * @spacing: the amount of spacing * * Sets the amount of spacing between the lines of the layout. **/ void pango_layout_set_spacing (PangoLayout *layout, int spacing) { g_return_if_fail (layout != NULL); if (spacing != layout->spacing) { layout->spacing = spacing; pango_layout_clear_lines (layout); } } /** * pango_layout_get_spacing: * @layout: a #PangoLayout * * Gets the amount of spacing between the lines of the layout. * * Return value: the spacing (in #PangoGlyphUnit) **/ int pango_layout_get_spacing (PangoLayout *layout) { g_return_val_if_fail (layout != NULL, 0); return layout->spacing; } /** * pango_layout_set_attributes: * @layout: a #PangoLayout * @attrs: a #PangoAttrList * * Sets the text attributes for a layout object. **/ void pango_layout_set_attributes (PangoLayout *layout, PangoAttrList *attrs) { PangoAttrList *old_attrs; g_return_if_fail (layout != NULL); old_attrs = layout->attrs; layout->attrs = attrs; if (layout->attrs) pango_attr_list_ref (layout->attrs); pango_layout_clear_lines (layout); if (old_attrs) pango_attr_list_unref (old_attrs); layout->tab_width = -1; } /** * pango_layout_get_attributes: * @layout: a #PangoLayout * * Gets the attribute list for the layout, if any. * * Return value: a #PangoAttrList **/ PangoAttrList* pango_layout_get_attributes (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL); return layout->attrs; } /** * pango_layout_set_font_description: * @layout: a #PangoLayout * @desc: the new #PangoFontDescription, or %NULL to unset the * current font description. * * Sets the default font description for the layout. If no font * description is set on the layout, the font description from * the layout's context is used. **/ void pango_layout_set_font_description (PangoLayout *layout, const PangoFontDescription *desc) { g_return_if_fail (layout != NULL); if (desc != layout->font_desc) { if (layout->font_desc) pango_font_description_free (layout->font_desc); if (desc) layout->font_desc = pango_font_description_copy (desc); else layout->font_desc = NULL; pango_layout_clear_lines (layout); layout->tab_width = -1; } } /** * pango_layout_get_font_description: * @layout: a #PangoLayout * * Gets the font description for the layout, if any. * * Return value: a pointer to the layout's font description, * or %NULL if the font description from the layout's * context is inherited. This value is owned by the layout * and must not be modified or freed. **/ G_CONST_RETURN PangoFontDescription * pango_layout_get_font_description (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL); return layout->font_desc; } /** * pango_layout_set_justify: * @layout: a #PangoLayout * @justify: whether the lines in the layout should be justified. * * Sets whether or not each complete line should be stretched to * fill the entire width of the layout. This stretching is typically * done by adding whitespace, but for some scripts (such as Arabic), * the justification is done by extending the characters. * * Note that as of Pango-1.4, this functionality is not yet implemented. **/ void pango_layout_set_justify (PangoLayout *layout, gboolean justify) { g_return_if_fail (layout != NULL); layout->justify = justify; } /** * pango_layout_get_justify: * @layout: a #PangoLayout * * Gets whether or not each complete line should be stretched to * fill the entire width of the layout. * * Return value: the justify **/ gboolean pango_layout_get_justify (PangoLayout *layout) { g_return_val_if_fail (layout != NULL, FALSE); return layout->justify; } /** * pango_layout_set_auto_dir: * @layout: a #PangoLayout * @auto_dir: if %TRUE, compute the bidirectional base direction * from the layout's contents. * * Sets whether to calculate the bidirectional base direction * for the layout according to the contents of the layout; * when this flag is on (the default), then paragraphs in @layout that begin with strong right-to-left characters * (Arabic and Hebrew principally), will have right-to-left * layout, paragraphs with letters from other scripts will * have left-to-right layout. Paragraphs with only neutral * characters get their direction from the surrounding paragraphs. * * When %FALSE, the choice between left-to-right and * right-to-left layout is done by according to the base direction * of the layout's #PangoContext. (See pango_context_set_base_dir()). * * When the auto-computed direction or a paragraph differs from the * base direction of the context, then the interpretation of * %PANGO_ALIGN_LEFT and %PANGO_ALIGN_RIGHT are swapped. **/ void pango_layout_set_auto_dir (PangoLayout *layout, gboolean auto_dir) { g_return_if_fail (PANGO_IS_LAYOUT (layout)); auto_dir = auto_dir != FALSE; if (auto_dir != layout->auto_dir) { layout->auto_dir = auto_dir; pango_layout_clear_lines (layout); } } /** * pango_layout_get_auto_dir: * @layout: a #PangoLayout * * Gets whether to calculate the bidirectional base direction * for the layout according to the contents of the layout. * See pango_layout_set_auto_dir(). * * Return value: if %TRUE, the bidirectional base direction * is computed from the layout's contents. **/ gboolean pango_layout_get_auto_dir (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), FALSE); return layout->auto_dir; } /** * pango_layout_set_alignment: * @layout: a #PangoLayout * @alignment: the new alignment * * Sets the alignment for the layout (how partial lines are * positioned within the horizontal space available.) **/ void pango_layout_set_alignment (PangoLayout *layout, PangoAlignment alignment) { g_return_if_fail (layout != NULL); layout->alignment = alignment; } /** * pango_layout_get_alignment: * @layout: a #PangoLayout * * Sets the alignment for the layout (how partial lines are * positioned within the horizontal space available.) * * Return value: the alignment value **/ PangoAlignment pango_layout_get_alignment (PangoLayout *layout) { g_return_val_if_fail (layout != NULL, PANGO_ALIGN_LEFT); return layout->alignment; } /** * pango_layout_set_tabs: * @layout: a #PangoLayout * @tabs: a #PangoTabArray * * Sets the tabs to use for @layout, overriding the default tabs * (by default, tabs are every 8 spaces). If @tabs is %NULL, the default * tabs are reinstated. @tabs is copied into the layout; you must * free your copy of @tabs yourself. **/ void pango_layout_set_tabs (PangoLayout *layout, PangoTabArray *tabs) { g_return_if_fail (PANGO_IS_LAYOUT (layout)); if (layout->tabs) pango_tab_array_free (layout->tabs); layout->tabs = tabs ? pango_tab_array_copy (tabs) : NULL; } /** * pango_layout_get_tabs: * @layout: a #PangoLayout * * Gets the current #PangoTabArray used by this layout. If no * #PangoTabArray has been set, then the default tabs are in use * and %NULL is returned. Default tabs are every 8 spaces. * The return value should be freed with pango_tab_array_free(). * * Return value: a copy of the tabs for this layout, or %NULL **/ PangoTabArray* pango_layout_get_tabs (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL); if (layout->tabs) return pango_tab_array_copy (layout->tabs); else return NULL; } /** * pango_layout_set_single_paragraph_mode: * @layout: a #PangoLayout * @setting: new setting * * If @setting is %TRUE, do not treat newlines and similar characters * as paragraph separators; instead, keep all text in a single paragraph, * and display a glyph for paragraph separator characters. Used when * you want to allow editing of newlines on a single text line. * **/ void pango_layout_set_single_paragraph_mode (PangoLayout *layout, gboolean setting) { g_return_if_fail (PANGO_IS_LAYOUT (layout)); setting = setting != FALSE; if (layout->single_paragraph != setting) { layout->single_paragraph = setting; pango_layout_clear_lines (layout); } } /** * pango_layout_get_single_paragraph_mode: * @layout: a #PangoLayout * * Obtains the value set by pango_layout_set_single_paragraph_mode(). * * Return value: %TRUE if the layout does not break paragraphs at * paragraph separator characters **/ gboolean pango_layout_get_single_paragraph_mode (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), FALSE); return layout->single_paragraph; } /** * pango_layout_set_ellipsize: * @layout: a #PangoLayout * @ellipsize: the new ellipsization mode for @layout * * Sets the type of ellipsization being performed for @layout. * Depending on the ellipsization mode @ellipsize text is * removed from the start, middle, or end of lines so they * fit within the width of layout set with pango_layout_set_width (). * * If the layout contains characters such as newlines that * force it to be layed out in multiple lines, then each line * is ellipsized separately. * * Since: 1.6 **/ void pango_layout_set_ellipsize (PangoLayout *layout, PangoEllipsizeMode ellipsize) { g_return_if_fail (PANGO_IS_LAYOUT (layout)); if (ellipsize != layout->ellipsize) { layout->ellipsize = ellipsize; pango_layout_clear_lines (layout); } } /** * pango_layout_get_ellipsize: * @layout: a #PangoLayout * * Gets the type of ellipsization being performed for @layout. * See pango_layout_set_ellipsize() * * Return value: the current ellipsization mode for @layout * * Since: 1.6 **/ PangoEllipsizeMode pango_layout_get_ellipsize (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), PANGO_ELLIPSIZE_NONE); return layout->ellipsize; } /** * pango_layout_set_text: * @layout: a #PangoLayout * @text: a UTF-8 string * @length: the length of @text, in bytes. -1 indicates that * the string is nul-terminated and the length should be * calculated. * * Sets the text of the layout. **/ void pango_layout_set_text (PangoLayout *layout, const char *text, int length) { const char *end; char *old_text; g_return_if_fail (layout != NULL); g_return_if_fail (length == 0 || text != NULL); old_text = layout->text; if (length != 0) { if (!g_utf8_validate (text, length, &end)) g_warning ("Invalid UTF-8 string passed to pango_layout_set_text()"); length = end - text; } /* NULL-terminate the text for convenience. */ layout->text = g_malloc (length + 1); if (length > 0) memcpy (layout->text, text, length); layout->text[length] = '\0'; layout->n_chars = g_utf8_strlen (layout->text, -1); layout->length = length; pango_layout_clear_lines (layout); if (old_text) g_free (old_text); } /** * pango_layout_get_text: * @layout: a #PangoLayout * * Gets the text in the layout. The returned text should not * be freed or modified. * * Return value: the text in the @layout **/ const char* pango_layout_get_text (PangoLayout *layout) { g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL); return layout->text; } /** * pango_layout_set_markup: * @layout: a #PangoLayout * @markup: marked-up text * @length: length of marked-up text in bytes, or -1 * * Same as pango_layout_set_markup_with_accel(), but * the markup text isn't scanned for accelerators. * **/ void pango_layout_set_markup (PangoLayout *layout, const char *markup, int length) { pango_layout_set_markup_with_accel (layout, markup, length, 0, NULL); } /** * pango_layout_set_markup_with_accel: * @layout: a #PangoLayout * @markup: some marked-up text * (see markup format) * @length: length of @markup in bytes * @accel_marker: marker for accelerators in the text * @accel_char: return location for any located accelerators * * Sets the layout text and attribute list from marked-up text (see * markup format). Replaces * the current text and attribute list. * * If @accel_marker is nonzero, the given character will mark the * character following it as an accelerator. For example, the accel * marker might be an ampersand or underscore. All characters marked * as an accelerator will receive a %PANGO_UNDERLINE_LOW attribute, * and the first character so marked will be returned in @accel_char. * Two @accel_marker characters following each other produce a single * literal @accel_marker character. **/ void pango_layout_set_markup_with_accel (PangoLayout *layout, const char *markup, int length, gunichar accel_marker, gunichar *accel_char) { PangoAttrList *list = NULL; char *text = NULL; GError *error; g_return_if_fail (PANGO_IS_LAYOUT (layout)); g_return_if_fail (markup != NULL); error = NULL; if (!pango_parse_markup (markup, length, accel_marker, &list, &text, accel_char, &error)) { g_warning ("%s: %s", G_STRLOC, error->message); g_error_free (error); return; } pango_layout_set_text (layout, text, -1); pango_layout_set_attributes (layout, list); pango_attr_list_unref (list); g_free (text); } /** * pango_layout_context_changed: * @layout: a #PangoLayout * * Forces recomputation of any state in the #PangoLayout that * might depend on the layout's context. This function should * be called if you make changes to the context subsequent * to creating the layout. **/ void pango_layout_context_changed (PangoLayout *layout) { pango_layout_clear_lines (layout); layout->tab_width = -1; } /** * pango_layout_get_log_attrs: * @layout: a #PangoLayout * @attrs: location to store a pointer to an array of logical attributes * This value must be freed with g_free(). * @n_attrs: location to store the number of the attributes in the * array. (The stored value will be one more than the total number * of characters in the layout, since there need to be attributes * corresponding to both the position before the first character * and the position after the last character.) * * Retrieves an array of logical attributes for each character in * the @layout. **/ void pango_layout_get_log_attrs (PangoLayout *layout, PangoLogAttr **attrs, gint *n_attrs) { g_return_if_fail (layout != NULL); pango_layout_check_lines (layout); if (attrs) { *attrs = g_new (PangoLogAttr, layout->n_chars + 1); memcpy (*attrs, layout->log_attrs, sizeof(PangoLogAttr) * (layout->n_chars + 1)); } if (n_attrs) *n_attrs = layout->n_chars + 1; } /** * pango_layout_get_line_count: * @layout: #PangoLayout * * Retrieves the count of lines for the @layout. * * Return value: the line count **/ int pango_layout_get_line_count (PangoLayout *layout) { g_return_val_if_fail (layout != NULL, 0); pango_layout_check_lines (layout); return g_slist_length (layout->lines); } /** * pango_layout_get_lines: * @layout: a #PangoLayout * * Returns the lines of the @layout as a list. * * Return value: a #GSList containing the lines in the layout. This * points to internal data of the #PangoLayout and must be used with * care. It will become invalid on any change to the layout's * text or properties. **/ GSList * pango_layout_get_lines (PangoLayout *layout) { pango_layout_check_lines (layout); return layout->lines; } /** * pango_layout_get_line: * @layout: a #PangoLayout * @line: the index of a line, which must be between 0 and * pango_layout_get_line_count(layout) - 1, inclusive. * * Retrieves a particular line from a #PangoLayout. * * Return value: the requested #PangoLayoutLine, or %NULL if the * index is out of range. This layout line can * be ref'ed and retained, but will become invalid * if changes are made to the #PangoLayout. **/ PangoLayoutLine * pango_layout_get_line (PangoLayout *layout, int line) { GSList *list_item; g_return_val_if_fail (layout != NULL, NULL); g_return_val_if_fail (line >= 0, NULL); if (line < 0) return NULL; pango_layout_check_lines (layout); list_item = g_slist_nth (layout->lines, line); if (list_item) return list_item->data; return NULL; } /** * pango_layout_line_index_to_x: * @line: a #PangoLayoutLine * @index_: byte offset of a grapheme within the layout * @trailing: an integer indicating the edge of the grapheme to retrieve * the position of. If 0, the trailing edge of the grapheme, * if > 0, the leading of the grapheme. * @x_pos: location to store the x_offset (in #PangoGlyphUnit) * * Converts an index within a line to a X position. * **/ void pango_layout_line_index_to_x (PangoLayoutLine *line, int index, int trailing, int *x_pos) { PangoLayout *layout = line->layout; GSList *run_list = line->runs; int width = 0; while (run_list) { PangoLayoutRun *run = run_list->data; ItemProperties properties; pango_layout_get_item_properties (run->item, &properties); if (run->item->offset <= index && run->item->offset + run->item->length > index) { if (properties.shape_set) { if (x_pos) *x_pos = width + (trailing > 0 ? properties.shape_logical_rect->width : 0); } else { int offset = g_utf8_pointer_to_offset (layout->text, layout->text + index); if (trailing) { while (index < line->start_index + line->length && offset + 1 < layout->n_chars && !layout->log_attrs[offset + 1].is_cursor_position) { offset++; index = g_utf8_next_char (layout->text + index) - layout->text; } } else { while (index > line->start_index && !layout->log_attrs[offset].is_cursor_position) { offset--; index = g_utf8_prev_char (layout->text + index) - layout->text; } } pango_glyph_string_index_to_x (run->glyphs, layout->text + run->item->offset, run->item->length, &run->item->analysis, index - run->item->offset, trailing, x_pos); if (x_pos) *x_pos += width; } return; } if (!properties.shape_set) { PangoRectangle logical_rect; pango_glyph_string_extents (run->glyphs, run->item->analysis.font, NULL, &logical_rect); width += logical_rect.width; } else { width += properties.shape_logical_rect->width; } run_list = run_list->next; } if (x_pos) *x_pos = width; } static PangoLayoutLine * pango_layout_index_to_line (PangoLayout *layout, int index, int *line_nr, PangoLayoutLine **line_before, PangoLayoutLine **line_after) { GSList *tmp_list; GSList *line_list; PangoLayoutLine *line = NULL; PangoLayoutLine *prev_line = NULL; int i = 0; line_list = tmp_list = layout->lines; while (tmp_list) { PangoLayoutLine *tmp_line = tmp_list->data; if (tmp_line && tmp_line->start_index > index) break; /* index was in paragraph delimiters */ prev_line = line; line = tmp_line; line_list = tmp_list; i++; if (line->start_index + line->length > index) break; tmp_list = tmp_list->next; } if (line_nr) *line_nr = i; if (line_before) *line_before = prev_line; if (line_after) *line_after = (line_list && line_list->next) ? line_list->next->data : NULL; return line; } static PangoLayoutLine * pango_layout_index_to_line_and_extents (PangoLayout *layout, int index, PangoRectangle *line_rect) { PangoLayoutIter *iter; PangoLayoutLine *line = NULL; iter = pango_layout_get_iter (layout); while (TRUE) { PangoLayoutLine *tmp_line = pango_layout_iter_get_line (iter); if (tmp_line && tmp_line->start_index > index) break; /* index was in paragraph delimiters */ line = tmp_line; pango_layout_iter_get_line_extents (iter, NULL, line_rect); if (line->start_index + line->length > index) break; if (!pango_layout_iter_next_line (iter)) break; /* Use end of last line */ } pango_layout_iter_free (iter); return line; } /** * pango_layout_index_to_line_x: * @layout: a #PangoLayout * @index_: the byte index of a grapheme within the layout. * @trailing: an integer indicating the edge of the grapheme to retrieve the * position of. If 0, the trailing edge of the grapheme, if > 0, * the leading of the grapheme. * @line: location to store resulting line index. (which will * between 0 and pango_layout_get_line_count(layout) - 1) * @x_pos: location to store resulting position within line * (in thousandths of a device unit) * * Converts from byte @index_ within the @layout to line and X position. * (X position is measured from the left edge of the line) */ void pango_layout_index_to_line_x (PangoLayout *layout, int index, gboolean trailing, int *line, int *x_pos) { int line_num; PangoLayoutLine *layout_line = NULL; g_return_if_fail (layout != NULL); g_return_if_fail (index >= 0); g_return_if_fail (index <= layout->length); pango_layout_check_lines (layout); layout_line = pango_layout_index_to_line (layout, index, &line_num, NULL, NULL); if (layout_line) { /* use end of line if index was in the paragraph delimiters */ if (index > layout_line->start_index + layout_line->length) index = layout_line->start_index + layout_line->length; if (line) *line = line_num; pango_layout_line_index_to_x (layout_line, index, trailing, x_pos); } else { if (line) *line = -1; if (x_pos) *x_pos = -1; } } /** * pango_layout_move_cursor_visually: * @layout: a #PangoLayout. * @strong: whether the moving cursor is the strong cursor or the * weak cursor. The strong cursor is the cursor corresponding * to text insertion in the base direction for the layout. * @old_index: the byte index of the grapheme for the old index * @old_trailing: if 0, the cursor was at the trailing edge of the * grapheme indicated by @old_index, if > 0, the cursor * was at the leading edge. * @direction: direction to move cursor. A negative * value indicates motion to the left. * @new_index: location to store the new cursor byte index. A value of -1 * indicates that the cursor has been moved off the beginning * of the layout. A value of G_MAXINT indicates that * the cursor has been moved off the end of the layout. * @new_trailing: number of characters to move forward from the location returned * for @new_index to get the position where the cursor should * be displayed. This allows distinguishing the position at * the beginning of one line from the position at the end * of the preceding line. @new_index is always on the line * where the cursor should be displayed. * * Computes a new cursor position from an old position and * a count of positions to move visually. If @count is positive, * then the new strong cursor position will be one position * to the right of the old cursor position. If @count is position * then the new strong cursor position will be one position * to the left of the old cursor position. * * In the presence of bidirection text, the correspondence * between logical and visual order will depend on the direction * of the current run, and there may be jumps when the cursor * is moved off of the end of a run. * * Motion here is in cursor positions, not in characters, so a * single call to pango_layout_move_cursor_visually() may move the * cursor over multiple characters when multiple characters combine * to form a single grapheme. **/ void pango_layout_move_cursor_visually (PangoLayout *layout, gboolean strong, int old_index, int old_trailing, int direction, int *new_index, int *new_trailing) { PangoLayoutLine *line = NULL; PangoLayoutLine *prev_line; PangoLayoutLine *next_line; int *log2vis_map; int *vis2log_map; int n_vis; int vis_pos, log_pos; int start_offset; gboolean off_start = FALSE; gboolean off_end = FALSE; g_return_if_fail (layout != NULL); g_return_if_fail (old_index >= 0 && old_index <= layout->length); g_return_if_fail (old_index < layout->length || old_trailing == 0); g_return_if_fail (new_index != NULL); g_return_if_fail (new_trailing != NULL); pango_layout_check_lines (layout); /* Find the line the old cursor is on */ line = pango_layout_index_to_line (layout, old_index, NULL, &prev_line, &next_line); start_offset = g_utf8_pointer_to_offset (layout->text, layout->text + line->start_index); while (old_trailing--) old_index = g_utf8_next_char (layout->text + old_index) - layout->text; log2vis_map = pango_layout_line_get_log2vis_map (line, strong); n_vis = g_utf8_strlen (layout->text + line->start_index, line->length); /* Clamp old_index to fit on the line */ if (old_index > (line->start_index + line->length)) old_index = line->start_index + line->length; vis_pos = log2vis_map[old_index - line->start_index]; g_free (log2vis_map); /* Handling movement between lines */ if (vis_pos == 0 && direction < 0) { if (line->resolved_dir == PANGO_DIRECTION_LTR) off_start = TRUE; else off_end = TRUE; } else if (vis_pos == n_vis && direction > 0) { if (line->resolved_dir == PANGO_DIRECTION_LTR) off_end = TRUE; else off_start = TRUE; } if (off_start || off_end) { /* If we move over a paragraph boundary, count that as * an extra position in the motion */ gboolean paragraph_boundary; if (off_start) { if (!prev_line) { *new_index = -1; *new_trailing = 0; return; } line = prev_line; paragraph_boundary = (line->start_index + line->length != old_index); } else { if (!next_line) { *new_index = G_MAXINT; *new_trailing = 0; return; } line = next_line; paragraph_boundary = (line->start_index != old_index); } if (vis_pos == 0 && direction < 0) { vis_pos = g_utf8_strlen (layout->text + line->start_index, line->length); if (paragraph_boundary) vis_pos++; } else /* (vis_pos == n_vis && direction > 0) */ { vis_pos = 0; if (paragraph_boundary) vis_pos--; } } vis2log_map = pango_layout_line_get_vis2log_map (line, strong); do { vis_pos += direction > 0 ? 1 : -1; log_pos = g_utf8_pointer_to_offset (layout->text + line->start_index, layout->text + line->start_index + vis2log_map[vis_pos]); } while (vis_pos > 0 && vis_pos < n_vis && !layout->log_attrs[start_offset + log_pos].is_cursor_position); *new_index = line->start_index + vis2log_map[vis_pos]; g_free (vis2log_map); *new_trailing = 0; if (*new_index == line->start_index + line->length && line->length > 0) { do { log_pos--; *new_index = g_utf8_prev_char (layout->text + *new_index) - layout->text; (*new_trailing)++; } while (log_pos > 0 && !layout->log_attrs[start_offset + log_pos].is_cursor_position); } } /** * pango_layout_xy_to_index: * @layout: a #PangoLayout * @x: the X offset (in #PangoGlyphUnit) * from the left edge of the layout. * @y: the Y offset (in #PangoGlyphUnit) * from the top edge of the layout * @index_: location to store calculated byte index * @trailing: location to store a integer indicating where * in the grapheme the user clicked. It will either * be zero, or the number of characters in the * grapheme. 0 represents the trailing edge of the grapheme. * * Converts from X and Y position within a layout to the byte * index to the character at that logical position. If the * Y position is not inside the layout, the closest position is chosen * (the position will be clamped inside the layout). If the * X position is not within the layout, then the start or the * end of the line is chosen as described for pango_layout_x_to_index(). * If either the X or Y positions were not inside the layout, then the * function returns %FALSE; on an exact hit, it returns %TRUE. * * Return value: %TRUE if the coordinates were inside text **/ gboolean pango_layout_xy_to_index (PangoLayout *layout, int x, int y, int *index, gint *trailing) { PangoLayoutIter *iter; PangoLayoutLine *prev_line = NULL; PangoLayoutLine *found = NULL; int found_line_x = 0; int prev_first = 0; int prev_last = 0; int prev_line_x = 0; gboolean retval = FALSE; gboolean outside = FALSE; g_return_val_if_fail (PANGO_IS_LAYOUT (layout), FALSE); iter = pango_layout_get_iter (layout); do { PangoRectangle line_logical; int first_y, last_y; pango_layout_iter_get_line_extents (iter, NULL, &line_logical); pango_layout_iter_get_line_yrange (iter, &first_y, &last_y); if (y < first_y) { if (prev_line && y < (prev_last + (first_y - prev_last) / 2)) { found = prev_line; found_line_x = prev_line_x; } else { if (prev_line == NULL) outside = TRUE; /* off the top */ found = pango_layout_iter_get_line (iter); found_line_x = x - line_logical.x; } } else if (y >= first_y && y < last_y) { found = pango_layout_iter_get_line (iter); found_line_x = x - line_logical.x; } prev_line = pango_layout_iter_get_line (iter); prev_first = first_y; prev_last = last_y; prev_line_x = x - line_logical.x; if (found != NULL) break; } while (pango_layout_iter_next_line (iter)); pango_layout_iter_free (iter); if (found == NULL) { /* Off the bottom of the layout */ outside = TRUE; found = prev_line; found_line_x = prev_line_x; } retval = pango_layout_line_x_to_index (found, found_line_x, index, trailing); if (outside) retval = FALSE; return retval; } /** * pango_layout_index_to_pos: * @layout: a #PangoLayout * @index_: byte index within @layout * @pos: rectangle in which to store the position of the grapheme * * Converts from an index within a #PangoLayout to the onscreen position * corresponding to the grapheme at that index, which is represented * as rectangle. Note that pos->x is always the leading * edge of the grapheme and pos->x + pos->width the trailing * edge of the grapheme. If the directionality of the grapheme is right-to-left, * then pos->width will be negative. **/ void pango_layout_index_to_pos (PangoLayout *layout, int index, PangoRectangle *pos) { PangoRectangle logical_rect; PangoLayoutIter *iter; PangoLayoutLine *layout_line = NULL; int x_pos; g_return_if_fail (layout != NULL); g_return_if_fail (index >= 0); g_return_if_fail (pos != NULL); iter = pango_layout_get_iter (layout); while (TRUE) { PangoLayoutLine *tmp_line = pango_layout_iter_get_line (iter); if (tmp_line && tmp_line->start_index > index) { /* index is in the paragraph delimiters, move to * end of previous line */ index = layout_line->start_index + layout_line->length; break; } layout_line = tmp_line; pango_layout_iter_get_line_extents (iter, NULL, &logical_rect); if (layout_line->start_index + layout_line->length > index) break; if (!pango_layout_iter_next_line (iter)) { index = layout_line->start_index + layout_line->length; break; } } pos->y = logical_rect.y; pos->height = logical_rect.height; pango_layout_line_index_to_x (layout_line, index, 0, &x_pos); pos->x = logical_rect.x + x_pos; if (index < layout_line->start_index + layout_line->length) { pango_layout_line_index_to_x (layout_line, index, 1, &x_pos); pos->width = (logical_rect.x + x_pos) - pos->x; } else pos->width = 0; pango_layout_iter_free (iter); } static void pango_layout_line_get_range (PangoLayoutLine *line, char **start, char **end) { char *p; p = line->layout->text + line->start_index; if (start) *start = p; if (end) *end = p + line->length; } static int * pango_layout_line_get_vis2log_map (PangoLayoutLine *line, gboolean strong) { PangoLayout *layout = line->layout; PangoDirection prev_dir; PangoDirection cursor_dir; GSList *tmp_list; gchar *start, *end; int *result; int pos; int n_chars; pango_layout_line_get_range (line, &start, &end); n_chars = g_utf8_strlen (start, end - start); result = g_new (int, n_chars + 1); if (strong) cursor_dir = line->resolved_dir; else cursor_dir = (line->resolved_dir == PANGO_DIRECTION_LTR) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR; /* Handle the first visual position */ if (line->resolved_dir == cursor_dir) result[0] = line->resolved_dir == PANGO_DIRECTION_LTR ? 0 : end - start; prev_dir = line->resolved_dir; pos = 0; tmp_list = line->runs; while (tmp_list) { PangoLayoutRun *run = tmp_list->data; int run_n_chars = run->item->num_chars; PangoDirection run_dir = (run->item->analysis.level % 2) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR; char *p = layout->text + run->item->offset; int i; /* pos is the visual position at the start of the run */ /* p is the logical byte index at the start of the run */ if (run_dir == PANGO_DIRECTION_LTR) { if ((cursor_dir == PANGO_DIRECTION_LTR) || (prev_dir == run_dir)) result[pos] = p - start; p = g_utf8_next_char (p); for (i = 1; i < run_n_chars; i++) { result[pos + i] = p - start; p = g_utf8_next_char (p); } if (cursor_dir == PANGO_DIRECTION_LTR) result[pos + run_n_chars] = p - start; } else { if (cursor_dir == PANGO_DIRECTION_RTL) result[pos + run_n_chars] = p - start; p = g_utf8_next_char (p); for (i = 1; i < run_n_chars; i++) { result[pos + run_n_chars - i] = p - start; p = g_utf8_next_char (p); } if ((cursor_dir == PANGO_DIRECTION_RTL) || (prev_dir == run_dir)) result[pos] = p - start; } pos += run_n_chars; prev_dir = run_dir; tmp_list = tmp_list->next; } /* And the last visual position */ if ((cursor_dir == line->resolved_dir) || (prev_dir == line->resolved_dir)) result[pos] = line->resolved_dir == PANGO_DIRECTION_LTR ? end - start : 0; return result; } static int * pango_layout_line_get_log2vis_map (PangoLayoutLine *line, gboolean strong) { gchar *start, *end; int *reverse_map; int *result; int i; int n_chars; pango_layout_line_get_range (line, &start, &end); n_chars = g_utf8_strlen (start, end - start); result = g_new0 (int, end - start + 1); reverse_map = pango_layout_line_get_vis2log_map (line, strong); for (i=0; i <= n_chars; i++) result[reverse_map[i]] = i; g_free (reverse_map); return result; } static PangoDirection pango_layout_line_get_char_direction (PangoLayoutLine *layout_line, int index) { GSList *run_list; run_list = layout_line->runs; while (run_list) { PangoLayoutRun *run = run_list->data; if (run->item->offset <= index && run->item->offset + run->item->length > index) return run->item->analysis.level % 2 ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR; run_list = run_list->next; } g_assert_not_reached (); return PANGO_DIRECTION_LTR; } /** * pango_layout_get_cursor_pos: * @layout: a #PangoLayout * @index_: the byte index of the cursor * @strong_pos: location to store the strong cursor position (may be %NULL) * @weak_pos: location to store the weak cursor position (may be %NULL) * * Given an index within a layout, determines the positions that of the * strong and weak cursors if the insertion point is at that * index. The position of each cursor is stored as a zero-width * rectangle. The strong cursor location is the location where * characters of the directionality equal to the base direction of the * layout are inserted. The weak cursor location is the location * where characters of the directionality opposite to the base * direction of the layout are inserted. **/ void pango_layout_get_cursor_pos (PangoLayout *layout, int index, PangoRectangle *strong_pos, PangoRectangle *weak_pos) { PangoDirection dir1, dir2; PangoRectangle line_rect; PangoLayoutLine *layout_line = NULL; /* Quiet GCC */ int x1_trailing; int x2; g_return_if_fail (layout != NULL); g_return_if_fail (index >= 0 && index <= layout->length); layout_line = pango_layout_index_to_line_and_extents (layout, index, &line_rect); g_assert (index >= layout_line->start_index); /* Examine the trailing edge of the character before the cursor */ if (index == layout_line->start_index) { dir1 = layout_line->resolved_dir; if (layout_line->resolved_dir == PANGO_DIRECTION_LTR) x1_trailing = 0; else x1_trailing = line_rect.width; } else { gint prev_index = g_utf8_prev_char (layout->text + index) - layout->text; dir1 = pango_layout_line_get_char_direction (layout_line, prev_index); pango_layout_line_index_to_x (layout_line, prev_index, TRUE, &x1_trailing); } /* Examine the leading edge of the character after the cursor */ if (index >= layout_line->start_index + layout_line->length) { dir2 = layout_line->resolved_dir; if (layout_line->resolved_dir == PANGO_DIRECTION_LTR) x2 = line_rect.width; else x2 = 0; } else { dir2 = pango_layout_line_get_char_direction (layout_line, index); pango_layout_line_index_to_x (layout_line, index, FALSE, &x2); } if (strong_pos) { strong_pos->x = line_rect.x; if (dir1 == layout_line->resolved_dir) strong_pos->x += x1_trailing; else strong_pos->x += x2; strong_pos->y = line_rect.y; strong_pos->width = 0; strong_pos->height = line_rect.height; } if (weak_pos) { weak_pos->x = line_rect.x; if (dir1 == layout_line->resolved_dir) weak_pos->x += x2; else weak_pos->x += x1_trailing; weak_pos->y = line_rect.y; weak_pos->width = 0; weak_pos->height = line_rect.height; } } static inline int direction_simple (PangoDirection d) { switch (d) { case PANGO_DIRECTION_LTR : return 1; case PANGO_DIRECTION_RTL : return -1; case PANGO_DIRECTION_TTB_LTR : return 1; case PANGO_DIRECTION_TTB_RTL : return -1; case PANGO_DIRECTION_WEAK_LTR : return 1; case PANGO_DIRECTION_WEAK_RTL : return -1; case PANGO_DIRECTION_NEUTRAL : return 0; /* no default compiler should complain if a new values is added */ } /* not reached */ return 0; } static PangoAlignment get_alignment (PangoLayout *layout, PangoLayoutLine *line) { PangoAlignment alignment = layout->alignment; if (line->layout->auto_dir && direction_simple (line->resolved_dir) == -direction_simple (pango_context_get_base_dir (layout->context))) { if (alignment == PANGO_ALIGN_LEFT) alignment = PANGO_ALIGN_RIGHT; else if (alignment == PANGO_ALIGN_RIGHT) alignment = PANGO_ALIGN_LEFT; } return alignment; } static void get_x_offset (PangoLayout *layout, PangoLayoutLine *line, int layout_width, int line_width, int *x_offset) { PangoAlignment alignment = get_alignment (layout, line); /* Alignment */ if (alignment == PANGO_ALIGN_RIGHT) *x_offset = layout_width - line_width; else if (alignment == PANGO_ALIGN_CENTER) *x_offset = (layout_width - line_width) / 2; else *x_offset = 0; /* Indentation */ /* For center, we ignore indentation; I think I've seen word * processors that still do the indentation here as if it were * indented left/right, though we can't sensibly do that without * knowing whether left/right is the "normal" thing for this text */ if (alignment == PANGO_ALIGN_CENTER) return; if (line->is_paragraph_start) { if (layout->indent > 0) { if (alignment == PANGO_ALIGN_LEFT) *x_offset += layout->indent; else *x_offset -= layout->indent; } } else { if (layout->indent < 0) { if (alignment == PANGO_ALIGN_LEFT) *x_offset -= layout->indent; else *x_offset += layout->indent; } } } static void get_line_extents_layout_coords (PangoLayout *layout, PangoLayoutLine *line, int layout_width, int y_offset, int *baseline, PangoRectangle *line_ink_layout, PangoRectangle *line_logical_layout) { int x_offset; /* Line extents in line coords (origin at line baseline) */ PangoRectangle line_ink; PangoRectangle line_logical; pango_layout_line_get_extents (line, line_ink_layout ? &line_ink : NULL, &line_logical); get_x_offset (layout, line, layout_width, line_logical.width, &x_offset); /* Convert the line's extents into layout coordinates */ if (line_ink_layout) { *line_ink_layout = line_ink; line_ink_layout->x = line_ink.x + x_offset; line_ink_layout->y = y_offset - line_logical.y + line_ink.y; } if (line_logical_layout) { *line_logical_layout = line_logical; line_logical_layout->x = line_logical.x + x_offset; line_logical_layout->y = y_offset; } if (baseline) *baseline = y_offset - line_logical.y; } /* if non-NULL line_extents returns a list of line extents * in layout coordinates */ static void pango_layout_get_extents_internal (PangoLayout *layout, PangoRectangle *ink_rect, PangoRectangle *logical_rect, GSList **line_extents) { GSList *line_list; int y_offset = 0; int width; gboolean need_width = FALSE; g_return_if_fail (layout != NULL); pango_layout_check_lines (layout); /* When we are not wrapping, we need the overall width of the layout to * figure out the x_offsets of each line. However, we only need the * x_offsets if we are computing the ink_rect or individual line extents. */ width = layout->width; /* If one of the lines of the layout is not left aligned, then we need * the width of the width to calculate line x-offsets; this requires * looping through the lines for layout->auto_dir. */ if (layout->auto_dir) { line_list = layout->lines; while (line_list) { PangoLayoutLine *line = line_list->data; if (get_alignment (layout, line) != PANGO_ALIGN_LEFT) need_width = TRUE; line_list = line_list->next; } } else if (layout->alignment != PANGO_ALIGN_LEFT) need_width = TRUE; if (width == -1 && need_width && (ink_rect || line_extents)) { PangoRectangle overall_logical; pango_layout_get_extents (layout, NULL, &overall_logical); width = overall_logical.width; } if (logical_rect) { logical_rect->x = 0; logical_rect->y = 0; logical_rect->width = 0; logical_rect->height = 0; } line_list = layout->lines; while (line_list) { PangoLayoutLine *line = line_list->data; /* Line extents in layout coords (origin at 0,0 of the layout) */ PangoRectangle line_ink_layout; PangoRectangle line_logical_layout; int new_pos; /* This block gets the line extents in layout coords */ { int baseline; get_line_extents_layout_coords (layout, line, width, y_offset, &baseline, ink_rect ? &line_ink_layout : NULL, &line_logical_layout); if (line_extents) { Extents *ext = g_new (Extents, 1); ext->baseline = baseline; ext->ink_rect = line_ink_layout; ext->logical_rect = line_logical_layout; *line_extents = g_slist_prepend (*line_extents, ext); } } if (ink_rect) { /* Compute the union of the current ink_rect with * line_ink_layout */ if (line_list == layout->lines) { *ink_rect = line_ink_layout; } else { new_pos = MIN (ink_rect->x, line_ink_layout.x); ink_rect->width = MAX (ink_rect->x + ink_rect->width, line_ink_layout.x + line_ink_layout.width) - new_pos; ink_rect->x = new_pos; new_pos = MIN (ink_rect->y, line_ink_layout.y); ink_rect->height = MAX (ink_rect->y + ink_rect->height, line_ink_layout.y + line_ink_layout.height) - new_pos; ink_rect->y = new_pos; } } if (logical_rect) { if (layout->width == -1) { /* When no width is set on layout, we can just compute the max of the * line lengths to get the horizontal extents ... logical_rect.x = 0. */ logical_rect->width = MAX (logical_rect->width, line_logical_layout.width); } else { /* When a width is set, we have to compute the union of the horizontal * extents of all the lines. */ if (line_list == layout->lines) { logical_rect->x = line_logical_layout.x; logical_rect->width = line_logical_layout.width; } else { new_pos = MIN (logical_rect->x, line_logical_layout.x); logical_rect->width = MAX (logical_rect->x + logical_rect->width, line_logical_layout.x + line_logical_layout.width) - new_pos; logical_rect->x = new_pos; } } logical_rect->height += line_logical_layout.height; /* No space after the last line, of course. */ if (line_list->next != NULL) logical_rect->height += layout->spacing; } y_offset += line_logical_layout.height + layout->spacing; line_list = line_list->next; } if (line_extents) *line_extents = g_slist_reverse (*line_extents); } /** * pango_layout_get_extents: * @layout: a #PangoLayout * @ink_rect: rectangle used to store the extents of the layout as drawn * or %NULL to indicate that the result is not needed. * @logical_rect: rectangle used to store the logical extents of the layout or %NULL to indicate that the result is not needed. * * Computes the logical and ink extents of @layout. Logical extents * are usually what you want for positioning things. The extents * are given in layout coordinates; layout coordinates begin at the * top left corner of the layout. */ void pango_layout_get_extents (PangoLayout *layout, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { g_return_if_fail (layout != NULL); pango_layout_get_extents_internal (layout, ink_rect, logical_rect, NULL); } /** * pango_layout_get_pixel_extents: * @layout: a #PangoLayout * @ink_rect: rectangle used to store the extents of the layout as drawn * or %NULL to indicate that the result is not needed. * @logical_rect: rectangle used to store the logical extents of the * layout or %NULL to indicate that the result is not needed. * * Computes the logical and ink extents of @layout in device units. * See pango_layout_get_extents(); this function just calls * pango_layout_get_extents() and then converts the extents to * device units using the %PANGO_SCALE factor. **/ void pango_layout_get_pixel_extents (PangoLayout *layout, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { g_return_if_fail (PANGO_IS_LAYOUT (layout)); pango_layout_get_extents (layout, ink_rect, logical_rect); if (ink_rect) { ink_rect->width = (ink_rect->width + PANGO_SCALE / 2) / PANGO_SCALE; ink_rect->height = (ink_rect->height + PANGO_SCALE / 2) / PANGO_SCALE; ink_rect->x = PANGO_PIXELS (ink_rect->x); ink_rect->y = PANGO_PIXELS (ink_rect->y); } if (logical_rect) { logical_rect->width = (logical_rect->width + PANGO_SCALE / 2) / PANGO_SCALE; logical_rect->height = (logical_rect->height + PANGO_SCALE / 2) / PANGO_SCALE; logical_rect->x = PANGO_PIXELS (logical_rect->x); logical_rect->y = PANGO_PIXELS (logical_rect->y); } } /** * pango_layout_get_size: * @layout: a #PangoLayout * @width: location to store the logical width, or %NULL * @height: location to store the logical height, or %NULL * * Determines the logical width and height of a #PangoLayout * in Pango units. (device units divided by %PANGO_SCALE). This * is simply a convenience function around pango_layout_get_extents(). **/ void pango_layout_get_size (PangoLayout *layout, int *width, int *height) { PangoRectangle logical_rect; pango_layout_get_extents (layout, NULL, &logical_rect); if (width) *width = logical_rect.width; if (height) *height = logical_rect.height; } /** * pango_layout_get_pixel_size: * @layout: a #PangoLayout * @width: location to store the logical width, or %NULL * @height: location to store the logical height, or %NULL * * Determines the logical width and height of a #PangoLayout * in device units. (pango_layout_get_size() returns the width * and height in thousandths of a device unit.) This * is simply a convenience function around pango_layout_get_extents(). **/ void pango_layout_get_pixel_size (PangoLayout *layout, int *width, int *height) { PangoRectangle logical_rect; pango_layout_get_extents (layout, NULL, &logical_rect); if (width) *width = (logical_rect.width + PANGO_SCALE / 2) / PANGO_SCALE; if (height) *height = (logical_rect.height + PANGO_SCALE / 2) / PANGO_SCALE; } static void pango_layout_clear_lines (PangoLayout *layout) { if (layout->lines) { GSList *tmp_list = layout->lines; while (tmp_list) { PangoLayoutLine *line = tmp_list->data; tmp_list = tmp_list->next; line->layout = NULL; pango_layout_line_unref (line); } g_slist_free (layout->lines); layout->lines = NULL; /* This could be handled separately, since we don't need to * recompute log_attrs on a width change, but this is easiest */ g_free (layout->log_attrs); layout->log_attrs = NULL; } } /************************************************ * Some functions for handling PANGO_ATTR_SHAPE * ************************************************/ static void imposed_shape (const char *text, gint n_chars, PangoRectangle *shape_ink, PangoRectangle *shape_logical, PangoGlyphString *glyphs) { int i; const char *p; pango_glyph_string_set_size (glyphs, n_chars); for (i=0, p = text; i < n_chars; i++, p = g_utf8_next_char (p)) { glyphs->glyphs[i].glyph = 0; glyphs->glyphs[i].geometry.x_offset = 0; glyphs->glyphs[i].geometry.y_offset = 0; glyphs->glyphs[i].geometry.width = shape_logical->width; glyphs->glyphs[i].attr.is_cluster_start = 1; glyphs->log_clusters[i] = p - text; } } static void imposed_extents (gint n_chars, PangoRectangle *shape_ink, PangoRectangle *shape_logical, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { if (n_chars > 0) { if (ink_rect) { ink_rect->x = MIN (shape_ink->x, shape_ink->x + shape_logical->width * (n_chars - 1)); ink_rect->width = MAX (shape_ink->width, shape_ink->width + shape_logical->width * (n_chars - 1)); ink_rect->y = shape_ink->y; ink_rect->height = shape_ink->height; } if (logical_rect) { logical_rect->x = MIN (shape_logical->x, shape_logical->x + shape_logical->width * (n_chars - 1)); logical_rect->width = MAX (shape_logical->width, shape_logical->width + shape_logical->width * (n_chars - 1)); logical_rect->y = shape_logical->y; logical_rect->height = shape_logical->height; } } else { if (ink_rect) { ink_rect->x = 0; ink_rect->y = 0; ink_rect->width = 0; ink_rect->height = 0; } if (logical_rect) { logical_rect->x = 0; logical_rect->y = 0; logical_rect->width = 0; logical_rect->height = 0; } } } /***************** * Line Breaking * *****************/ static void shape_tab (PangoLayoutLine *line, PangoGlyphString *glyphs); static void free_run (PangoLayoutRun *run, gboolean free_item) { if (free_item) pango_item_free (run->item); pango_glyph_string_free (run->glyphs); g_free (run); } static PangoItem * uninsert_run (PangoLayoutLine *line) { PangoLayoutRun *run; PangoItem *item; GSList *tmp_node = line->runs; run = tmp_node->data; item = run->item; line->runs = tmp_node->next; line->length -= item->length; g_slist_free_1 (tmp_node); free_run (run, FALSE); return item; } static void ensure_tab_width (PangoLayout *layout) { if (layout->tab_width == -1) { /* Find out how wide 8 spaces are in the context's default * font. Utter performance killer. :-( */ PangoGlyphString *glyphs = pango_glyph_string_new (); PangoItem *item; GList *items; PangoAttribute *attr; PangoAttrList *layout_attrs; PangoAttrList *tmp_attrs; PangoAttrIterator *iter; PangoFontDescription *font_desc = pango_font_description_copy_static (pango_context_get_font_description (layout->context)); PangoLanguage *language; int i; layout_attrs = pango_layout_get_effective_attributes (layout); iter = pango_attr_list_get_iterator (layout_attrs); pango_attr_iterator_get_font (iter, font_desc, &language, NULL); tmp_attrs = pango_attr_list_new (); attr = pango_attr_font_desc_new (font_desc); pango_font_description_free (font_desc); attr->start_index = 0; attr->end_index = 1; pango_attr_list_insert_before (tmp_attrs, attr); if (language) { attr = pango_attr_language_new (language); attr->start_index = 0; attr->end_index = 1; pango_attr_list_insert_before (tmp_attrs, attr); } items = pango_itemize (layout->context, " ", 0, 1, tmp_attrs, NULL); pango_attr_iterator_destroy (iter); if (layout_attrs != layout->attrs) pango_attr_list_unref (layout_attrs); pango_attr_list_unref (tmp_attrs); item = items->data; pango_shape (" ", 8, &item->analysis, glyphs); pango_item_free (item); g_list_free (items); layout->tab_width = 0; for (i=0; i < glyphs->num_glyphs; i++) layout->tab_width += glyphs->glyphs[i].geometry.width; pango_glyph_string_free (glyphs); /* We need to make sure the tab_width is > 0 so finding tab positions * terminates. This check should be necessary only under extreme * problems with the font. */ if (layout->tab_width <= 0) layout->tab_width = 50 * PANGO_SCALE; /* pretty much arbitrary */ } } /* For now we only need the tab position, we assume * all tabs are left-aligned. */ static int get_tab_pos (PangoLayout *layout, int index) { gint n_tabs; gboolean in_pixels; if (layout->tabs) { n_tabs = pango_tab_array_get_size (layout->tabs); in_pixels = pango_tab_array_get_positions_in_pixels (layout->tabs); } else { n_tabs = 0; in_pixels = FALSE; } if (index < n_tabs) { gint pos = 0; pango_tab_array_get_tab (layout->tabs, index, NULL, &pos); if (in_pixels) return pos * PANGO_SCALE; else return pos; } if (n_tabs > 0) { /* Extrapolate tab position, repeating the last tab gap to * infinity. */ int last_pos = 0; int next_to_last_pos = 0; int tab_width; pango_tab_array_get_tab (layout->tabs, n_tabs - 1, NULL, &last_pos); if (n_tabs > 1) pango_tab_array_get_tab (layout->tabs, n_tabs - 2, NULL, &next_to_last_pos); else next_to_last_pos = 0; if (in_pixels) { next_to_last_pos *= PANGO_SCALE; last_pos *= PANGO_SCALE; } if (last_pos > next_to_last_pos) { tab_width = last_pos - next_to_last_pos; } else { ensure_tab_width (layout); tab_width = layout->tab_width; } return last_pos + tab_width * (index - n_tabs + 1); } else { /* No tab array set, so use default tab width */ ensure_tab_width (layout); return layout->tab_width * index; } } static int line_width (PangoLayoutLine *line) { GSList *l; int i; int width = 0; /* Compute the width of the line currently - inefficient, but easier * than keeping the current width of the line up to date everywhere */ for (l = line->runs; l; l = l->next) { PangoLayoutRun *run = l->data; for (i=0; i < run->glyphs->num_glyphs; i++) width += run->glyphs->glyphs[i].geometry.width; } return width; } static void shape_tab (PangoLayoutLine *line, PangoGlyphString *glyphs) { int i; int current_width = line_width (line); pango_glyph_string_set_size (glyphs, 1); glyphs->glyphs[0].glyph = 0; glyphs->glyphs[0].geometry.x_offset = 0; glyphs->glyphs[0].geometry.y_offset = 0; glyphs->glyphs[0].attr.is_cluster_start = 1; glyphs->log_clusters[0] = 0; for (i=0;;i++) { int tab_pos = get_tab_pos (line->layout, i); if (tab_pos > current_width) { glyphs->glyphs[0].geometry.width = tab_pos - current_width; break; } } } static inline gboolean can_break_at (PangoLayout *layout, gint offset, gboolean always_wrap_char) { PangoWrapMode wrap; /* We probably should have a mode where we treat all white-space as * of fungible width - appropriate for typography but not for * editing. */ wrap = layout->wrap; if (wrap == PANGO_WRAP_WORD_CHAR) wrap = always_wrap_char ? PANGO_WRAP_CHAR : PANGO_WRAP_WORD; if (offset == layout->n_chars) return TRUE; else if (wrap == PANGO_WRAP_WORD) return layout->log_attrs[offset].is_line_break; else if (wrap == PANGO_WRAP_CHAR) return layout->log_attrs[offset].is_char_break; else { g_warning (G_STRLOC": broken PangoLayout"); return TRUE; } } static inline gboolean can_break_in (PangoLayout *layout, int start_offset, int num_chars, gboolean allow_break_at_start) { int i; for (i = allow_break_at_start ? 0 : 1; i < num_chars; i++) if (can_break_at (layout, start_offset + i, FALSE)) return TRUE; return FALSE; } typedef enum { BREAK_NONE_FIT, BREAK_SOME_FIT, BREAK_ALL_FIT, BREAK_EMPTY_FIT, BREAK_LINE_SEPARATOR } BreakResult; struct _ParaBreakState { PangoAttrList *attrs; /* Attributes being used for itemization */ GList *items; /* This paragraph turned into items */ PangoDirection base_dir; /* Current resolved base direction */ gboolean first_line; /* TRUE if this is the first line of the paragraph */ int line_start_index; /* Start index of line in layout->text */ int remaining_width; /* Amount of space remaining on line; < 0 is infinite */ int start_offset; /* Character offset of first item in state->items in layout->text */ PangoGlyphString *glyphs; /* Glyphs for the first item in state->items */ ItemProperties properties; /* Properties for the first item in state->items */ PangoGlyphUnit *log_widths; /* Logical widths for first item in state->items.. */ int log_widths_offset; /* Offset into log_widths to the point corresponding * to the remaining portion of the first item */ }; static PangoGlyphString * shape_run (PangoLayoutLine *line, ParaBreakState *state, PangoItem *item) { PangoLayout *layout = line->layout; PangoGlyphString *glyphs = pango_glyph_string_new (); if (layout->text[item->offset] == '\t') shape_tab (line, glyphs); else { if (state->properties.shape_set) imposed_shape (layout->text + item->offset, item->num_chars, state->properties.shape_ink_rect, state->properties.shape_logical_rect, glyphs); else pango_shape (layout->text + item->offset, item->length, &item->analysis, glyphs); if (state->properties.letter_spacing) { PangoGlyphItem glyph_item; glyph_item.item = item; glyph_item.glyphs = glyphs; pango_glyph_item_letter_space (&glyph_item, layout->text, layout->log_attrs + state->start_offset, state->properties.letter_spacing); /* We put all the letter spacing after the last glyph, then * will go back and redistribute it at the beginning and the * end in a post-processing step over the whole line. */ glyphs->glyphs[glyphs->num_glyphs - 1].geometry.width += state->properties.letter_spacing; } } return glyphs; } static void insert_run (PangoLayoutLine *line, ParaBreakState *state, PangoItem *run_item, gboolean last_run) { PangoLayoutRun *run = g_new (PangoLayoutRun, 1); run->item = run_item; if (last_run && state->log_widths_offset == 0) run->glyphs = state->glyphs; else run->glyphs = shape_run (line, state, run_item); if (last_run) { if (state->log_widths_offset > 0) pango_glyph_string_free (state->glyphs); state->glyphs = NULL; g_free (state->log_widths); } line->runs = g_slist_prepend (line->runs, run); line->length += run_item->length; } /* Tries to insert as much as possible of the item at the head of * state->items onto @line. Three results are possible: * * BREAK_NONE_FIT: Couldn't fit anything * BREAK_SOME_FIT: The item was broken in the middle * BREAK_ALL_FIT: Everything fit. * BREAK_EMPTY_FIT: Nothing fit, but that was ok, as we can break at the first char. * * If @force_fit is TRUE, then BREAK_NONE_FIT will never * be returned, a run will be added even if inserting the minimum amount * will cause the line to overflow. This is used at the start of a line * and until we've found at least some place to break. * * If @no_break_at_end is TRUE, then BREAK_ALL_FIT will never be * returned even everything fits; the run will be broken earlier, * or BREAK_NONE_FIT returned. This is used when the end of the * run is not a break position. */ static BreakResult process_item (PangoLayout *layout, PangoLayoutLine *line, ParaBreakState *state, gboolean force_fit, gboolean no_break_at_end) { PangoItem *item = state->items->data; gboolean shape_set = FALSE; int width; int length; int i; gboolean processing_new_item = FALSE; /* Only one character has type G_UNICODE_LINE_SEPARATOR in Unicode 4.0; * update this if that changes. */ #define LINE_SEPARATOR 0x2028 if (!state->glyphs) { pango_layout_get_item_properties (item, &state->properties); state->glyphs = shape_run (line, state, item); state->log_widths = NULL; state->log_widths_offset = 0; processing_new_item = TRUE; } if (!layout->single_paragraph && g_utf8_get_char (layout->text + item->offset) == LINE_SEPARATOR) { insert_run (line, state, item, TRUE); state->log_widths_offset += item->num_chars; return BREAK_LINE_SEPARATOR; } if (state->remaining_width < 0 && !no_break_at_end) /* Wrapping off */ { insert_run (line, state, item, TRUE); return BREAK_ALL_FIT; } width = 0; if (processing_new_item) { for (i = 0; i < state->glyphs->num_glyphs; i++) width += state->glyphs->glyphs[i].geometry.width; /* We'll add half the letter spacing to each side of the item */ width += state->properties.letter_spacing; } else { for (i = 0; i < item->num_chars; i++) width += state->log_widths[state->log_widths_offset + i]; /* In this case, the letter spacing width has already been * added to the last element in log_widths */ } if ((width <= state->remaining_width || (item->num_chars == 1 && !line->runs)) && !no_break_at_end) { state->remaining_width -= width; state->remaining_width = MAX (state->remaining_width, 0); insert_run (line, state, item, TRUE); return BREAK_ALL_FIT; } else { int num_chars = item->num_chars; int break_num_chars = num_chars; int break_width = width; int orig_width = width; gboolean retrying_with_char_breaks = FALSE; if (processing_new_item) { state->log_widths = g_new (PangoGlyphUnit, item->num_chars); pango_glyph_string_get_logical_widths (state->glyphs, layout->text + item->offset, item->length, item->analysis.level, state->log_widths); /* The extra run letter spacing is actually divided after * the last and and before the first, but it works to * account it all on the last */ if (item->num_chars > 0) state->log_widths[item->num_chars - 1] += state->properties.letter_spacing; } retry_break: /* Shorten the item by one line break */ while (--num_chars >= 0) { width -= (state->log_widths)[state->log_widths_offset + num_chars]; /* If there are no previous runs we have to take care to grab at least one char. */ if (can_break_at (layout, state->start_offset + num_chars, retrying_with_char_breaks) && (num_chars > 0 || line->runs)) { break_num_chars = num_chars; break_width = width; if (width <= state->remaining_width || (num_chars == 1 && !line->runs)) break; } } if (layout->wrap == PANGO_WRAP_WORD_CHAR && force_fit && break_width > state->remaining_width && !retrying_with_char_breaks) { retrying_with_char_breaks = TRUE; num_chars = item->num_chars; width = orig_width; break_num_chars = num_chars; break_width = width; goto retry_break; } if (force_fit || break_width <= state->remaining_width) /* Succesfully broke the item */ { if (state->remaining_width >= 0) { state->remaining_width -= break_width; state->remaining_width = MAX (state->remaining_width, 0); } if (break_num_chars == item->num_chars) { insert_run (line, state, item, TRUE); return BREAK_ALL_FIT; } else if (break_num_chars == 0) { return BREAK_EMPTY_FIT; } else { PangoItem *new_item; length = g_utf8_offset_to_pointer (layout->text + item->offset, break_num_chars) - (layout->text + item->offset); new_item = pango_item_split (item, length, break_num_chars); insert_run (line, state, new_item, FALSE); state->log_widths_offset += break_num_chars; /* Shaped items should never be broken */ g_assert (!shape_set); return BREAK_SOME_FIT; } } else { pango_glyph_string_free (state->glyphs); state->glyphs = NULL; g_free (state->log_widths); return BREAK_NONE_FIT; } } } /* The resolved direction for the line is always one * of LTR/RTL; not a week or neutral directions */ static void line_set_resolved_dir (PangoLayoutLine *line, PangoDirection direction) { switch (direction) { case PANGO_DIRECTION_LTR: case PANGO_DIRECTION_TTB_RTL: case PANGO_DIRECTION_WEAK_LTR: case PANGO_DIRECTION_NEUTRAL: line->resolved_dir = PANGO_DIRECTION_LTR; break; case PANGO_DIRECTION_RTL: case PANGO_DIRECTION_WEAK_RTL: case PANGO_DIRECTION_TTB_LTR: line->resolved_dir = PANGO_DIRECTION_RTL; break; } } static void process_line (PangoLayout *layout, ParaBreakState *state) { PangoLayoutLine *line; gboolean have_break = FALSE; /* If we've seen a possible break yet */ int break_remaining_width = 0; /* Remaining width before adding run with break */ int break_start_offset = 0; /* Start width before adding run with break */ GSList *break_link = NULL; /* Link holding run before break */ line = pango_layout_line_new (layout); line->start_index = state->line_start_index; line->is_paragraph_start = state->first_line; line_set_resolved_dir (line, state->base_dir); if (layout->ellipsize != PANGO_ELLIPSIZE_NONE) state->remaining_width = -1; else if (state->first_line) state->remaining_width = (layout->indent >= 0) ? layout->width - layout->indent : layout->width; else state->remaining_width = (layout->indent >= 0) ? layout->width : layout->width + layout->indent; while (state->items) { PangoItem *item = state->items->data; BreakResult result; int old_num_chars; int old_remaining_width; gboolean first_item_in_line; old_num_chars = item->num_chars; old_remaining_width = state->remaining_width; first_item_in_line = line->runs != NULL; result = process_item (layout, line, state, !have_break, FALSE); switch (result) { case BREAK_ALL_FIT: if (can_break_in (layout, state->start_offset, old_num_chars, first_item_in_line)) { have_break = TRUE; break_remaining_width = old_remaining_width; break_start_offset = state->start_offset; break_link = line->runs->next; } state->items = g_list_delete_link (state->items, state->items); state->start_offset += old_num_chars; break; case BREAK_EMPTY_FIT: goto done; case BREAK_SOME_FIT: state->start_offset += old_num_chars - item->num_chars; goto done; case BREAK_NONE_FIT: /* Back up over unused runs to run where there is a break */ while (line->runs && line->runs != break_link) state->items = g_list_prepend (state->items, uninsert_run (line)); state->start_offset = break_start_offset; state->remaining_width = break_remaining_width; /* Reshape run to break */ item = state->items->data; old_num_chars = item->num_chars; result = process_item (layout, line, state, TRUE, TRUE); g_assert (result == BREAK_SOME_FIT || result == BREAK_EMPTY_FIT); state->start_offset += old_num_chars - item->num_chars; goto done; case BREAK_LINE_SEPARATOR: state->items = g_list_delete_link (state->items, state->items); state->start_offset += old_num_chars; goto done; } } done: pango_layout_line_postprocess (line, state); layout->lines = g_slist_prepend (layout->lines, line); state->first_line = FALSE; state->line_start_index += line->length; } static void get_items_log_attrs (const char *text, GList *items, PangoLogAttr *log_attrs, int para_delimiter_len) { int offset = 0; int index = 0; while (items) { PangoItem tmp_item = *(PangoItem *)items->data; /* Accumulate all the consecutive items that match in language * characteristics, ignoring font, style tags, etc. */ while (items->next) { PangoItem *next_item = items->next->data; /* FIXME: Handle language tags */ if (next_item->analysis.lang_engine != tmp_item.analysis.lang_engine) break; else { tmp_item.length += next_item->length; tmp_item.num_chars += next_item->num_chars; } items = items->next; } /* Break the paragraph delimiters with the last item */ if (items->next == NULL) { tmp_item.num_chars += g_utf8_strlen (text + index + tmp_item.length, para_delimiter_len); tmp_item.length += para_delimiter_len; } pango_break (text + index, tmp_item.length, &tmp_item.analysis, log_attrs + offset, tmp_item.num_chars + 1); offset += tmp_item.num_chars; index += tmp_item.length; items = items->next; } } static PangoAttrList * pango_layout_get_effective_attributes (PangoLayout *layout) { PangoAttrList *attrs; if (layout->attrs) attrs = pango_attr_list_copy (layout->attrs); else attrs = pango_attr_list_new (); if (layout->font_desc) { PangoAttribute *attr = pango_attr_font_desc_new (layout->font_desc); attr->start_index = 0; attr->end_index = layout->length; pango_attr_list_insert_before (attrs, attr); } return attrs; } static gboolean no_shape_filter_func (PangoAttribute *attribute, gpointer data) { static const PangoAttrType no_shape_types[] = { PANGO_ATTR_FOREGROUND, PANGO_ATTR_BACKGROUND, PANGO_ATTR_UNDERLINE, PANGO_ATTR_STRIKETHROUGH, PANGO_ATTR_RISE }; int i; for (i = 0; i < G_N_ELEMENTS (no_shape_types); i++) if (attribute->klass->type == no_shape_types[i]) return TRUE; return FALSE; } static PangoAttrList * filter_no_shape_attributes (PangoAttrList *attrs) { return pango_attr_list_filter (attrs, no_shape_filter_func, NULL); } static void apply_no_shape_attributes (PangoLayout *layout, PangoAttrList *no_shape_attrs) { GSList *line_list; for (line_list = layout->lines; line_list; line_list = line_list->next) { PangoLayoutLine *line = line_list->data; GSList *old_runs = g_slist_reverse (line->runs); GSList *run_list; line->runs = NULL; for (run_list = old_runs; run_list; run_list = run_list->next) { PangoGlyphItem *glyph_item = run_list->data; GSList *new_runs; new_runs = pango_glyph_item_apply_attrs (glyph_item, layout->text, no_shape_attrs); line->runs = g_slist_concat (new_runs, line->runs); } g_slist_free (old_runs); } } static void pango_layout_check_lines (PangoLayout *layout) { const char *start; gboolean done = FALSE; int start_offset; PangoAttrList *attrs; PangoAttrList *no_shape_attrs; PangoAttrIterator *iter; PangoDirection prev_base_dir = PANGO_DIRECTION_NEUTRAL, base_dir = PANGO_DIRECTION_NEUTRAL; if (layout->lines) return; g_assert (!layout->log_attrs); /* For simplicity, we make sure at this point that layout->text * is non-NULL even if it is zero length */ if (!layout->text) pango_layout_set_text (layout, NULL, 0); attrs = pango_layout_get_effective_attributes (layout); no_shape_attrs = filter_no_shape_attributes (attrs); iter = pango_attr_list_get_iterator (attrs); layout->log_attrs = g_new (PangoLogAttr, layout->n_chars + 1); start_offset = 0; start = layout->text; /* Find the first strong direction of the text */ if (layout->auto_dir) { prev_base_dir = pango_find_base_dir (layout->text, layout->length); if (prev_base_dir == PANGO_DIRECTION_NEUTRAL) prev_base_dir = pango_context_get_base_dir (layout->context); } else base_dir = pango_context_get_base_dir (layout->context); do { int delim_len; const char *end; int delimiter_index, next_para_index; ParaBreakState state; if (layout->single_paragraph) { delimiter_index = layout->length; next_para_index = layout->length; } else { pango_find_paragraph_boundary (start, (layout->text + layout->length) - start, &delimiter_index, &next_para_index); } g_assert (next_para_index >= delimiter_index); if (layout->auto_dir) { base_dir = pango_find_base_dir (start, delimiter_index); /* Propagate the base direction for neutral paragraphs */ if (base_dir == PANGO_DIRECTION_NEUTRAL) base_dir = prev_base_dir; else prev_base_dir = base_dir; } end = start + delimiter_index; delim_len = next_para_index - delimiter_index; if (end == (layout->text + layout->length)) done = TRUE; g_assert (end <= (layout->text + layout->length)); g_assert (start <= (layout->text + layout->length)); g_assert (delim_len < 4); /* PS is 3 bytes */ g_assert (delim_len >= 0); state.attrs = attrs; state.items = pango_itemize_with_base_dir (layout->context, base_dir, layout->text, start - layout->text, end - start, attrs, iter); get_items_log_attrs (start, state.items, layout->log_attrs + start_offset, delim_len); if (state.items) { state.first_line = TRUE; state.base_dir = base_dir; state.start_offset = start_offset; state.line_start_index = start - layout->text; state.glyphs = NULL; state.log_widths = NULL; while (state.items) process_line (layout, &state); } else { PangoLayoutLine *empty_line; empty_line = pango_layout_line_new (layout); empty_line->start_index = start - layout->text; empty_line->is_paragraph_start = TRUE; line_set_resolved_dir (empty_line, base_dir); layout->lines = g_slist_prepend (layout->lines, empty_line); } if (!done) start_offset += g_utf8_strlen (start, (end - start) + delim_len); start = end + delim_len; } while (!done); pango_attr_iterator_destroy (iter); pango_attr_list_unref (attrs); if (no_shape_attrs) { apply_no_shape_attributes (layout, no_shape_attrs); pango_attr_list_unref (no_shape_attrs); } layout->lines = g_slist_reverse (layout->lines); } /** * pango_layout_line_ref: * @line: a #PangoLayoutLine * * Increases the reference count of a #PangoLayoutLine by one. **/ void pango_layout_line_ref (PangoLayoutLine *line) { PangoLayoutLinePrivate *private = (PangoLayoutLinePrivate *)line; g_return_if_fail (line != NULL); private->ref_count++; } /** * pango_layout_line_unref: * @line: a #PangoLayoutLine * * Decreases the reference count of a #PangoLayoutLine by one. * if the result is zero, the line and all associated memory * will be freed. **/ void pango_layout_line_unref (PangoLayoutLine *line) { PangoLayoutLinePrivate *private = (PangoLayoutLinePrivate *)line; g_return_if_fail (line != NULL); g_return_if_fail (private->ref_count > 0); private->ref_count--; if (private->ref_count == 0) { GSList *tmp_list = line->runs; while (tmp_list) { free_run (tmp_list->data, TRUE); tmp_list = tmp_list->next; } g_slist_free (line->runs); g_free (line); } } /** * pango_layout_line_x_to_index: * @line: a #PangoLayoutLine * @x_pos: the x offset (in #PangoGlyphUnit) * from the left edge of the line. * @index_: location to store calculated byte index for * the grapheme in which the user clicked. * @trailing: location to store a integer indicating where * in the grapheme the user clicked. It will either * be zero, or the number of characters in the * grapheme. 0 represents the trailing edge of the grapheme. * * Converts from x offset to the byte index of the corresponding * character within the text of the layout. If @x_pos is outside the line, * @index_ and @trailing will point to the very first or very last position * in the line. This determination is based on the resolved direction * of the paragraph; for example, if the resolved direction is * right-to-left, then an X position to the right of the line (after it) * results in 0 being stored in @index_ and @trailing. An X position to the * left of the line results in @index_ pointing to the (logical) last * grapheme in the line and @trailing being set to the number of characters * in that grapheme. The reverse is true for a left-to-right line. * * Returns: %FALSE if @x_pos was outside the line, %TRUE if inside **/ gboolean pango_layout_line_x_to_index (PangoLayoutLine *line, int x_pos, int *index, int *trailing) { GSList *tmp_list; gint start_pos = 0; gint first_index = 0; /* line->start_index */ gint first_offset; gint last_index; /* start of last grapheme in line */ gint last_offset; gint end_index; /* end iterator for line */ gint end_offset; /* end iterator for line */ PangoLayout *layout; gint last_trailing; gboolean suppress_last_trailing; g_return_val_if_fail (line != NULL, FALSE); g_return_val_if_fail (LINE_IS_VALID (line), FALSE); if (!LINE_IS_VALID (line)) return FALSE; layout = line->layout; /* Find the last index in the line */ first_index = line->start_index; if (line->length == 0) { if (index) *index = first_index; if (trailing) *trailing = 0; return FALSE; } g_assert (line->length > 0); first_offset = g_utf8_pointer_to_offset (layout->text, layout->text + line->start_index); end_index = first_index + line->length; end_offset = first_offset + g_utf8_pointer_to_offset (layout->text + first_index, layout->text + end_index); last_index = end_index; last_offset = end_offset; last_trailing = 0; do { last_index = g_utf8_prev_char (layout->text + last_index) - layout->text; last_offset--; last_trailing++; } while (last_offset > first_offset && !layout->log_attrs[last_offset].is_cursor_position); /* This is a HACK. If a program only keeps track if cursor (etc) * indices and not the trailing flag, then the trailing index of the * last character on a wrapped line is identical to the leading * index of the next line. So, we fake it and set the trailing flag * to zero. * * That is, if the text is "now is the time", and is broken between * 'now' and 'is' * * Then when the cursor is actually at: * * n|o|w| |i|s| * ^ * we lie and say it is at: * * n|o|w| |i|s| * ^ * * So the cursor won't appear on the next line before 'the'. * * Actually, any program keeping cursor * positions with wrapped lines should distinguish leading and * trailing cursors. */ tmp_list = layout->lines; while (tmp_list->data != line) tmp_list = tmp_list->next; if (tmp_list->next && line->start_index + line->length == ((PangoLayoutLine *)tmp_list->next->data)->start_index) suppress_last_trailing = TRUE; else suppress_last_trailing = FALSE; if (x_pos < 0) { /* pick the leftmost char */ if (index) *index = (line->resolved_dir == PANGO_DIRECTION_LTR) ? first_index : last_index; /* and its leftmost edge */ if (trailing) *trailing = (line->resolved_dir == PANGO_DIRECTION_LTR || suppress_last_trailing) ? 0 : last_trailing; return FALSE; } tmp_list = line->runs; while (tmp_list) { PangoLayoutRun *run = tmp_list->data; PangoRectangle logical_rect; ItemProperties properties; pango_layout_get_item_properties (run->item, &properties); if (properties.shape_set) logical_rect = *properties.shape_logical_rect; else pango_glyph_string_extents (run->glyphs, run->item->analysis.font, NULL, &logical_rect); if (x_pos >= start_pos && x_pos < start_pos + logical_rect.width) { int offset; gboolean char_trailing; int grapheme_start_index; int grapheme_start_offset; int grapheme_end_offset; int pos; int char_index; char_index = run->item->offset; if (properties.shape_set) { *trailing = 0; } else { pango_glyph_string_x_to_index (run->glyphs, layout->text + run->item->offset, run->item->length, &run->item->analysis, x_pos - start_pos, &pos, &char_trailing); char_index += pos; } /* Convert from characters to graphemes */ offset = g_utf8_pointer_to_offset (layout->text, layout->text + char_index); grapheme_start_offset = offset; grapheme_start_index = char_index; while (grapheme_start_offset > first_offset && !layout->log_attrs[grapheme_start_offset].is_cursor_position) { grapheme_start_index = g_utf8_prev_char (layout->text + grapheme_start_index) - layout->text; grapheme_start_offset--; } grapheme_end_offset = offset; do { grapheme_end_offset++; } while (grapheme_end_offset < end_offset && !layout->log_attrs[grapheme_end_offset].is_cursor_position); if (index) *index = grapheme_start_index; if (trailing) { if ((grapheme_end_offset == end_offset && suppress_last_trailing) || offset + char_trailing <= (grapheme_start_offset + grapheme_end_offset) / 2) *trailing = 0; else *trailing = grapheme_end_offset - grapheme_start_offset; } return TRUE; } start_pos += logical_rect.width; tmp_list = tmp_list->next; } /* pick the rightmost char */ if (index) *index = (line->resolved_dir == PANGO_DIRECTION_LTR) ? last_index : first_index; /* and its rightmost edge */ if (trailing) *trailing = (line->resolved_dir == PANGO_DIRECTION_LTR && !suppress_last_trailing) ? last_trailing : 0; return FALSE; } /** * pango_layout_line_get_x_ranges: * @line: a #PangoLayoutLine * @start_index: Start byte index of the logical range. If this value * is less than the start index for the line, then * the first range will extend all the way to the leading * edge of the layout. Otherwise it will start at the * leading edge of the first character. * @end_index: Ending byte index of the logical range. If this value * is greater than the end index for the line, then * the last range will extend all the way to the trailing * edge of the layout. Otherwise, it will end at the * trailing edge of the last character. * @ranges: location to store a pointer to an array of ranges. * The array will be of length 2*n_ranges, * with each range starting at (*ranges)[2*n] * and of width (*ranges)[2*n + 1] - (*ranges)[2*n]. * This array must be freed with g_free(). The coordinates are relative * to the layout and are in #PangoGlyphUnit. * @n_ranges: The number of ranges stored in @ranges. * * Gets a list of visual ranges corresponding to a given logical range. * This list is not necessarily minimal - there may be consecutive * ranges which are adjacent. The ranges will be sorted from left to * right. The ranges are with respect to the left edge of the entire * layout, not with respect to the line. **/ void pango_layout_line_get_x_ranges (PangoLayoutLine *line, int start_index, int end_index, int **ranges, int *n_ranges) { PangoRectangle logical_rect; gint line_start_index = 0; GSList *tmp_list; int range_count = 0; int accumulated_width = 0; int x_offset; int width; PangoAlignment alignment; g_return_if_fail (line != NULL); g_return_if_fail (line->layout != NULL); g_return_if_fail (start_index <= end_index); alignment = get_alignment (line->layout, line); width = line->layout->width; if (width == -1 && alignment != PANGO_ALIGN_LEFT) { pango_layout_get_extents (line->layout, NULL, &logical_rect); width = logical_rect.width; } /* FIXME: The computations here could be optimized, by moving the * computations of the x_offset after we go through and figure * out where each range is. */ pango_layout_line_get_extents (line, NULL, &logical_rect); /* FIXME it seems to me that width can be -1 here? */ get_x_offset (line->layout, line, width, logical_rect.width, &x_offset); line_start_index = line->start_index; /* Allocate the maximum possible size */ if (ranges) *ranges = g_new (int, 2 * (2 + g_slist_length (line->runs))); if (x_offset > 0 && ((line->resolved_dir == PANGO_DIRECTION_LTR && start_index < line_start_index) || (line->resolved_dir == PANGO_DIRECTION_RTL && end_index > line_start_index + line->length))) { if (ranges) { (*ranges)[2*range_count] = 0; (*ranges)[2*range_count + 1] = x_offset; } range_count ++; } tmp_list = line->runs; while (tmp_list) { PangoLayoutRun *run = (PangoLayoutRun *)tmp_list->data; if ((start_index < run->item->offset + run->item->length && end_index > run->item->offset)) { if (ranges) { int run_start_index = MAX (start_index, run->item->offset); int run_end_index = MIN (end_index, run->item->offset + run->item->length); int run_start_x, run_end_x; g_assert (run_end_index > 0); /* Back the end_index off one since we want to find the trailing edge of the preceding character */ run_end_index = g_utf8_prev_char (line->layout->text + run_end_index) - line->layout->text; pango_glyph_string_index_to_x (run->glyphs, line->layout->text + run->item->offset, run->item->length, &run->item->analysis, run_start_index - run->item->offset, FALSE, &run_start_x); pango_glyph_string_index_to_x (run->glyphs, line->layout->text + run->item->offset, run->item->length, &run->item->analysis, run_end_index - run->item->offset, TRUE, &run_end_x); (*ranges)[2*range_count] = x_offset + accumulated_width + MIN (run_start_x, run_end_x); (*ranges)[2*range_count + 1] = x_offset + accumulated_width + MAX (run_start_x, run_end_x); } range_count++; } if (tmp_list->next) { PangoRectangle run_logical; pango_glyph_string_extents (run->glyphs, run->item->analysis.font, NULL, &run_logical); accumulated_width += run_logical.width; } tmp_list = tmp_list->next; } if (x_offset + logical_rect.width < line->layout->width && ((line->resolved_dir == PANGO_DIRECTION_LTR && end_index > line_start_index + line->length) || (line->resolved_dir == PANGO_DIRECTION_RTL && start_index < line_start_index))) { if (ranges) { (*ranges)[2*range_count] = x_offset + logical_rect.width; (*ranges)[2*range_count + 1] = line->layout->width; } range_count ++; } if (n_ranges) *n_ranges = range_count; } static void pango_layout_line_get_empty_extents (PangoLayoutLine *line, PangoRectangle *logical_rect) { if (logical_rect) { char *line_start; int index; PangoLayout *layout = line->layout; PangoFont *font; PangoFontDescription *font_desc = NULL; gboolean free_font_desc = FALSE; pango_layout_line_get_range (line, &line_start, NULL); index = line_start - layout->text; /* Find the font description for this line */ if (layout->attrs) { PangoAttrIterator *iter = pango_attr_list_get_iterator (layout->attrs); int start, end; while (TRUE) { pango_attr_iterator_range (iter, &start, &end); if (start <= index && index < end) { PangoFontDescription *base_font_desc; if (layout->font_desc) base_font_desc = layout->font_desc; else base_font_desc = pango_context_get_font_description (layout->context); font_desc = pango_font_description_copy_static (base_font_desc); free_font_desc = TRUE; pango_attr_iterator_get_font (iter, font_desc, NULL, NULL); break; } pango_attr_iterator_next (iter); } pango_attr_iterator_destroy (iter); } else { if (layout->font_desc) font_desc = layout->font_desc; else font_desc = pango_context_get_font_description (layout->context); } font = pango_context_load_font (layout->context, font_desc); if (font) { PangoFontMetrics *metrics; metrics = pango_font_get_metrics (font, pango_context_get_language (layout->context)); logical_rect->y = - pango_font_metrics_get_ascent (metrics); logical_rect->height = - logical_rect->y + pango_font_metrics_get_descent (metrics); g_object_unref (font); pango_font_metrics_unref (metrics); } else { logical_rect->y = 0; logical_rect->height = 0; } if (free_font_desc) pango_font_description_free (font_desc); logical_rect->x = 0; logical_rect->width = 0; } } static void pango_layout_run_get_extents (PangoLayoutRun *run, PangoRectangle *run_ink, PangoRectangle *run_logical) { ItemProperties properties; PangoRectangle tmp_ink; gboolean need_ink; pango_layout_get_item_properties (run->item, &properties); need_ink = run_ink || properties.uline == PANGO_UNDERLINE_LOW; if (properties.shape_set) imposed_extents (run->item->num_chars, properties.shape_ink_rect, properties.shape_logical_rect, need_ink ? &tmp_ink : NULL, run_logical); else pango_glyph_string_extents (run->glyphs, run->item->analysis.font, need_ink ? &tmp_ink : NULL, run_logical); if (run_ink) *run_ink = tmp_ink; switch (properties.uline) { case PANGO_UNDERLINE_NONE: break; case PANGO_UNDERLINE_ERROR: if (run_ink) run_ink->height = MAX (run_ink->height, 3 * PANGO_SCALE - run_ink->y); if (run_logical) run_logical->height = MAX (run_logical->height, 3 * PANGO_SCALE - run_logical->y); break; case PANGO_UNDERLINE_SINGLE: if (run_ink) run_ink->height = MAX (run_ink->height, 2 * PANGO_SCALE - run_ink->y); if (run_logical) run_logical->height = MAX (run_logical->height, 2 * PANGO_SCALE - run_logical->y); break; case PANGO_UNDERLINE_DOUBLE: if (run_ink) run_ink->height = MAX (run_ink->height, 4 * PANGO_SCALE - run_ink->y); if (run_logical) run_logical->height = MAX (run_logical->height, 4 * PANGO_SCALE - run_logical->y); break; case PANGO_UNDERLINE_LOW: /* FIXME: Should this simply be run_logical->height += 2 * PANGO_SCALE instead? */ if (run_ink) run_ink->height += 2 * PANGO_SCALE; if (run_logical) run_logical->height = MAX (run_logical->height, tmp_ink.y + tmp_ink.height + 2 * PANGO_SCALE - run_logical->y); break; } if (properties.rise != 0) { if (run_ink) run_ink->y -= properties.rise; if (run_logical) run_logical->y -= properties.rise; } } /** * pango_layout_line_get_extents: * @line: a #PangoLayoutLine * @ink_rect: rectangle used to store the extents of the glyph string as drawn * or %NULL to indicate that the result is not needed. * @logical_rect: rectangle used to store the logical extents of the glyph string * or %NULL to indicate that the result is not needed. * * Computes the logical and ink extents of a layout line. See the documentation * for pango_font_get_glyph_extents() for details about the interpretation * of the rectangles. */ void pango_layout_line_get_extents (PangoLayoutLine *line, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { GSList *tmp_list; int x_pos = 0; g_return_if_fail (LINE_IS_VALID (line)); if (!LINE_IS_VALID (line)) return; if (ink_rect) { ink_rect->x = 0; ink_rect->y = 0; ink_rect->width = 0; ink_rect->height = 0; } if (logical_rect) { logical_rect->x = 0; logical_rect->y = 0; logical_rect->width = 0; logical_rect->height = 0; } tmp_list = line->runs; while (tmp_list) { PangoLayoutRun *run = tmp_list->data; int new_pos; PangoRectangle run_ink; PangoRectangle run_logical; pango_layout_run_get_extents (run, ink_rect ? &run_ink : NULL, &run_logical); if (ink_rect) { new_pos = MIN (ink_rect->x, x_pos + run_ink.x); ink_rect->width = MAX (ink_rect->x + ink_rect->width, x_pos + run_ink.x + run_ink.width) - new_pos; ink_rect->x = new_pos; new_pos = MIN (ink_rect->y, run_ink.y); ink_rect->height = MAX (ink_rect->y + ink_rect->height, run_ink.y + run_ink.height) - new_pos; ink_rect->y = new_pos; } if (logical_rect) { new_pos = MIN (logical_rect->x, x_pos + run_logical.x); logical_rect->width = MAX (logical_rect->x + logical_rect->width, x_pos + run_logical.x + run_logical.width) - new_pos; logical_rect->x = new_pos; new_pos = MIN (logical_rect->y, run_logical.y); logical_rect->height = MAX (logical_rect->y + logical_rect->height, run_logical.y + run_logical.height) - new_pos; logical_rect->y = new_pos; } x_pos += run_logical.width; tmp_list = tmp_list->next; } if (logical_rect && logical_rect->height == 0) { PangoRectangle temp_rect; pango_layout_line_get_empty_extents (line, &temp_rect); logical_rect->height = temp_rect.height; } } static PangoLayoutLine * pango_layout_line_new (PangoLayout *layout) { PangoLayoutLinePrivate *private = g_new (PangoLayoutLinePrivate, 1); private->ref_count = 1; private->line.layout = layout; private->line.runs = 0; private->line.length = 0; /* Note that we leave start_index, resolved_dir, and is_paragraph_start * uninitialized */ return (PangoLayoutLine *) private; } /** * pango_layout_line_get_pixel_extents: * @layout_line: a #PangoLayoutLine * @ink_rect: rectangle used to store the extents of the glyph string as drawn * or %NULL to indicate that the result is not needed. * @logical_rect: rectangle used to store the logical extents of the glyph string * or %NULL to indicate that the result is not needed. * * Computes the logical and ink extents of a layout line. See the documentation * for pango_font_get_glyph_extents() for details about the interpretation * of the rectangles. The returned rectangles are in device units, as * opposed to pango_layout_line_get_extents(), which returns the extents in * #PangoGlyphUnit. **/ void pango_layout_line_get_pixel_extents (PangoLayoutLine *layout_line, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { g_return_if_fail (LINE_IS_VALID (layout_line)); pango_layout_line_get_extents (layout_line, ink_rect, logical_rect); if (ink_rect) { ink_rect->width = (ink_rect->width + PANGO_SCALE / 2) / PANGO_SCALE; ink_rect->height = (ink_rect->height + PANGO_SCALE / 2) / PANGO_SCALE; ink_rect->x = PANGO_PIXELS (ink_rect->x); ink_rect->y = PANGO_PIXELS (ink_rect->y); } if (logical_rect) { logical_rect->width = (logical_rect->width + PANGO_SCALE / 2) / PANGO_SCALE; logical_rect->height = (logical_rect->height + PANGO_SCALE / 2) / PANGO_SCALE; logical_rect->x = PANGO_PIXELS (logical_rect->x); logical_rect->y = PANGO_PIXELS (logical_rect->y); } } /* * NB: This implement the exact same algorithm as * reorder-items.c:pango_reorder_items(). */ static GSList * reorder_runs_recurse (GSList *items, int n_items) { GSList *tmp_list, *level_start_node; int i, level_start_i; int min_level = G_MAXINT; GSList *result = NULL; if (n_items == 0) return NULL; tmp_list = items; for (i=0; idata; min_level = MIN (min_level, run->item->analysis.level); tmp_list = tmp_list->next; } level_start_i = 0; level_start_node = items; tmp_list = items; for (i=0; idata; if (run->item->analysis.level == min_level) { if (min_level % 2) { if (i > level_start_i) result = g_slist_concat (reorder_runs_recurse (level_start_node, i - level_start_i), result); result = g_slist_prepend (result, run); } else { if (i > level_start_i) result = g_slist_concat (result, reorder_runs_recurse (level_start_node, i - level_start_i)); result = g_slist_append (result, run); } level_start_i = i + 1; level_start_node = tmp_list->next; } tmp_list = tmp_list->next; } if (min_level % 2) { if (i > level_start_i) result = g_slist_concat (reorder_runs_recurse (level_start_node, i - level_start_i), result); } else { if (i > level_start_i) result = g_slist_concat (result, reorder_runs_recurse (level_start_node, i - level_start_i)); } return result; } static void pango_layout_line_reorder (PangoLayoutLine *line) { GSList *logical_runs = line->runs; line->runs = reorder_runs_recurse (logical_runs, g_slist_length (logical_runs)); g_slist_free (logical_runs); } static int get_item_letter_spacing (PangoItem *item) { ItemProperties properties; pango_layout_get_item_properties (item, &properties); return properties.letter_spacing; } static void adjust_final_space (PangoGlyphString *glyphs, int adjustment) { glyphs->glyphs[glyphs->num_glyphs - 1].geometry.width += adjustment; } static gboolean is_tab_run (PangoLayout *layout, PangoLayoutRun *run) { return (layout->text[run->item->offset] == '\t'); } /* When doing shaping, we add the letter spacing value for a * run after every grapheme in the run. This produces ugly * asymetrical results, so what this routine is redistributes * that space to the beginning and the end of the run. * * We also trim the letter spacing from runs adjacent to * tabs and from the outside runs of the lines so that things * line up properly. The line breaking and tab positioning * were computed without this trimming so they are no longer * exactly correct, but this won't be very noticable in most * cases. */ static void adjust_line_letter_spacing (PangoLayoutLine *line) { PangoLayout *layout = line->layout; gboolean reversed; PangoLayoutRun *last_run; int tab_adjustment; GSList *l; /* If we have tab stops and the resolved direction of the * line is RTL, then we need to walk through the line * in reverse direction to figure out the corrections for * tab stops. */ reversed = FALSE; if (line->resolved_dir == PANGO_DIRECTION_RTL) { for (l = line->runs; l; l = l->next) if (is_tab_run (layout, l->data)) { line->runs = g_slist_reverse (line->runs); reversed = TRUE; break; } } /* Walk over the runs in the line, redistributing letter * spacing from the end of the run to the start of the * run and trimming letter spacing from the ends of the * runs adjacent to the ends of the line or tab stops. * * We accumulate a correction factor from this trimming * which we add onto the next tab stop space to keep the * things properly aligned. */ last_run = NULL; tab_adjustment = 0; for (l = line->runs; l; l = l->next) { PangoLayoutRun *run = l->data; PangoLayoutRun *next_run = l->next ? l->next->data : NULL; if (is_tab_run (layout, run)) { adjust_final_space (run->glyphs, tab_adjustment); tab_adjustment = 0; } else { PangoLayoutRun *visual_next_run = reversed ? last_run : next_run; PangoLayoutRun *visual_last_run = reversed ? next_run : last_run; int run_spacing = get_item_letter_spacing (run->item); int adjustment = run_spacing / 2; if (visual_last_run && !is_tab_run (layout, visual_last_run)) adjust_final_space (visual_last_run->glyphs, adjustment); else tab_adjustment += adjustment; if (visual_next_run && !is_tab_run (layout, visual_next_run)) adjust_final_space (run->glyphs, - adjustment); else { adjust_final_space (run->glyphs, - run_spacing); tab_adjustment += run_spacing - adjustment; } } last_run = run; } if (reversed) line->runs = g_slist_reverse (line->runs); } static void pango_layout_line_postprocess (PangoLayoutLine *line, ParaBreakState *state) { /* NB: the runs are in reverse order at this point, since we prepended them to the list */ /* Reverse the runs */ line->runs = g_slist_reverse (line->runs); /* Ellipsize the line if necessary */ _pango_layout_line_ellipsize (line, state->attrs); /* Now convert logical to visual order */ pango_layout_line_reorder (line); /* Fixup letter spacing between runs */ adjust_line_letter_spacing (line); } static void pango_layout_get_item_properties (PangoItem *item, ItemProperties *properties) { GSList *tmp_list = item->analysis.extra_attrs; properties->uline = PANGO_UNDERLINE_NONE; properties->letter_spacing = 0; properties->rise = 0; properties->shape_set = FALSE; properties->shape_ink_rect = NULL; properties->shape_logical_rect = NULL; while (tmp_list) { PangoAttribute *attr = tmp_list->data; switch (attr->klass->type) { case PANGO_ATTR_UNDERLINE: properties->uline = ((PangoAttrInt *)attr)->value; break; case PANGO_ATTR_RISE: properties->rise = ((PangoAttrInt *)attr)->value; break; case PANGO_ATTR_LETTER_SPACING: properties->letter_spacing = ((PangoAttrInt *)attr)->value; break; case PANGO_ATTR_SHAPE: properties->shape_set = TRUE; properties->shape_logical_rect = &((PangoAttrShape *)attr)->logical_rect; properties->shape_ink_rect = &((PangoAttrShape *)attr)->ink_rect; break; default: break; } tmp_list = tmp_list->next; } } static gboolean check_invalid (PangoLayoutIter *iter, const char *loc) { if (iter->line->layout == NULL) { g_warning ("%s: PangoLayout changed since PangoLayoutIter was created, iterator invalid", loc); return TRUE; } else { return FALSE; } } #ifdef G_DISABLE_CHECKS #define IS_INVALID(iter) FALSE #else #define IS_INVALID(iter) check_invalid ((iter), G_STRLOC) #endif static int next_cluster_start (PangoGlyphString *gs, int cluster_start) { int i; i = cluster_start + 1; while (i < gs->num_glyphs) { if (gs->glyphs[i].attr.is_cluster_start) return i; i++; } return gs->num_glyphs; } static int cluster_width (PangoGlyphString *gs, int cluster_start) { int i; int log_cluster; int width = 0; log_cluster = gs->log_clusters[cluster_start]; for (i = cluster_start; i < gs->num_glyphs; i++) { if (gs->log_clusters[i] != log_cluster) break; width += gs->glyphs[i].geometry.width; } return width; } static inline void offset_y (PangoLayoutIter *iter, int *y) { Extents *line_ext; line_ext = (Extents*)iter->line_extents_link->data; *y += line_ext->baseline; } /* Sets up the iter for the start of a new cluster. cluster_start_index * is the byte index of the cluster start relative to the run. */ static void update_cluster (PangoLayoutIter *iter, int cluster_start_index) { char *cluster_text; PangoGlyphString *gs; int cluster_length; iter->character_position = 0; gs = iter->run->glyphs; iter->cluster_width = cluster_width (gs, iter->cluster_start); iter->next_cluster_glyph = next_cluster_start (gs, iter->cluster_start); if (iter->ltr) { /* For LTR text, finding the length of the cluster is easy * since logical and visual runs are in the same direction. */ if (iter->next_cluster_glyph < gs->num_glyphs) cluster_length = gs->log_clusters[iter->next_cluster_glyph] - cluster_start_index; else cluster_length = iter->run->item->length - cluster_start_index; } else { /* For RTL text, we have to scan backwards to find the previous * visual cluster which is the next logical cluster. */ int i = iter->cluster_start; while (i > 0 && gs->log_clusters[i - 1] == cluster_start_index) i--; if (i == 0) cluster_length = iter->run->item->length - cluster_start_index; else cluster_length = gs->log_clusters[i - 1] - cluster_start_index; } cluster_text = iter->layout->text + iter->run->item->offset + cluster_start_index; iter->cluster_num_chars = g_utf8_strlen (cluster_text, cluster_length); if (iter->ltr) iter->index = cluster_text - iter->layout->text; else iter->index = g_utf8_prev_char (cluster_text + cluster_length) - iter->layout->text; } static void update_run (PangoLayoutIter *iter, int run_start_index) { Extents *line_ext; line_ext = (Extents*)iter->line_extents_link->data; /* Note that in iter_new() the iter->run_logical_rect.width * is garbage but we don't use it since we're on the first run of * a line. */ if (iter->run_list_link == iter->line->runs) iter->run_x = line_ext->logical_rect.x; else iter->run_x += iter->run_logical_rect.width; if (iter->run) { pango_layout_run_get_extents (iter->run, NULL, &iter->run_logical_rect); /* Fix coordinates of the run extents to be layout-relative*/ iter->run_logical_rect.x += iter->run_x; offset_y (iter, &iter->run_logical_rect.y); } else { /* The empty run at the end of a line */ iter->run_logical_rect.x = iter->run_x; iter->run_logical_rect.y = line_ext->logical_rect.y; iter->run_logical_rect.width = 0; iter->run_logical_rect.height = line_ext->logical_rect.height; } if (iter->run) iter->ltr = (iter->run->item->analysis.level % 2) == 0; else iter->ltr = TRUE; iter->cluster_start = 0; iter->cluster_x = iter->run_logical_rect.x; if (iter->run) { update_cluster (iter, iter->run->glyphs->log_clusters[0]); } else { iter->cluster_width = 0; iter->character_position = 0; iter->cluster_num_chars = 0; iter->index = run_start_index; } } static PangoLayoutIter * pango_layout_iter_copy (PangoLayoutIter *iter) { PangoLayoutIter *new; GSList *l; new = g_new (PangoLayoutIter, 1); new->layout = g_object_ref (iter->layout); new->line_list_link = iter->line_list_link; new->line = iter->line; pango_layout_line_ref (new->line); new->run_list_link = iter->run_list_link; new->run = iter->run; new->index = iter->index; new->logical_rect = iter->logical_rect; new->line_extents = NULL; new->line_extents_link = NULL; for (l = iter->line_extents; l; l = l->next) { new->line_extents = g_slist_prepend (new->line_extents, g_memdup (l->data, sizeof (Extents))); if (l == iter->line_extents_link) new->line_extents_link = new->line_extents; } new->line_extents = g_slist_reverse (new->line_extents); new->run_x = iter->run_x; new->run_logical_rect = iter->run_logical_rect; new->ltr = iter->ltr; new->cluster_x = iter->cluster_x; new->cluster_width = iter->cluster_x; new->cluster_start = iter->cluster_start; new->next_cluster_glyph = iter->next_cluster_glyph; new->cluster_num_chars = iter->cluster_num_chars; new->character_position = iter->character_position; return new; } GType pango_layout_iter_get_type (void) { static GType our_type = 0; if (our_type == 0) our_type = g_boxed_type_register_static ("PangoLayoutIter", (GBoxedCopyFunc)pango_layout_iter_copy, (GBoxedFreeFunc)pango_layout_iter_free); return our_type; } /** * pango_layout_get_iter: * @layout: a #PangoLayout * * Returns an iterator to iterate over the visual extents of the layout. * * Return value: a new #PangoLayoutIter **/ PangoLayoutIter* pango_layout_get_iter (PangoLayout *layout) { int run_start_index; PangoLayoutIter *iter; g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL); iter = g_new (PangoLayoutIter, 1); iter->layout = layout; g_object_ref (iter->layout); pango_layout_check_lines (layout); iter->line_list_link = layout->lines; iter->line = iter->line_list_link->data; pango_layout_line_ref (iter->line); run_start_index = iter->line->start_index; iter->run_list_link = iter->line->runs; if (iter->run_list_link) { iter->run = iter->run_list_link->data; run_start_index = iter->run->item->offset; } else iter->run = NULL; iter->line_extents = NULL; pango_layout_get_extents_internal (layout, NULL, &iter->logical_rect, &iter->line_extents); iter->line_extents_link = iter->line_extents; update_run (iter, run_start_index); return iter; } /** * pango_layout_iter_free: * @iter: a #PangoLayoutIter * * Frees an iterator that's no longer in use. **/ void pango_layout_iter_free (PangoLayoutIter *iter) { g_return_if_fail (iter != NULL); g_slist_foreach (iter->line_extents, (GFunc) g_free, NULL); g_slist_free (iter->line_extents); pango_layout_line_unref (iter->line); g_object_unref (iter->layout); g_free (iter); } /** * pango_layout_iter_get_index: * @iter: a #PangoLayoutIter * * Gets the current byte index. Note that iterating forward by char * moves in visual order, not logical order, so indexes may not be * sequential. Also, the index may be equal to the length of the text * in the layout, if on the %NULL run (see pango_layout_iter_get_run()). * * Return value: current byte index **/ int pango_layout_iter_get_index (PangoLayoutIter *iter) { if (IS_INVALID (iter)) return 0; return iter->index; } /** * pango_layout_iter_get_run: * @iter: a #PangoLayoutIter * * Gets the current run. When iterating by run, at the end of each * line, there's a position with a %NULL run, so this function can return * %NULL. The %NULL run at the end of each line ensures that all lines have * at least one run, even lines consisting of only a newline. * * Return value: the current run **/ PangoLayoutRun* pango_layout_iter_get_run (PangoLayoutIter *iter) { if (IS_INVALID (iter)) return NULL; return iter->run; } /** * pango_layout_iter_get_line: * @iter: a #PangoLayoutIter * * Gets the current line. * * Return value: the current line **/ PangoLayoutLine* pango_layout_iter_get_line (PangoLayoutIter *iter) { if (IS_INVALID (iter)) return NULL; return iter->line; } /** * pango_layout_iter_at_last_line: * @iter: a #PangoLayoutIter * * Determines whether @iter is on the last line of the layout. * * Return value: %TRUE if @iter is on the last line **/ gboolean pango_layout_iter_at_last_line (PangoLayoutIter *iter) { if (IS_INVALID (iter)) return FALSE; return iter->line_extents_link->next == NULL; } static gboolean line_is_terminated (PangoLayoutIter *iter) { /* There is a real terminator at the end of each paragraph other * than the last. */ if (iter->line_list_link->next) { PangoLayoutLine *next_line = iter->line_list_link->next->data; if (next_line->is_paragraph_start) return TRUE; } return FALSE; } /* Moves to the next non-empty line. If @include_terminators * is set, a line with just an explicit paragraph separator * is considered non-empty. */ static gboolean next_nonempty_line (PangoLayoutIter *iter, gboolean include_terminators) { gboolean result; while (TRUE) { result = pango_layout_iter_next_line (iter); if (!result) break; if (iter->line->runs) break; if (include_terminators && line_is_terminated (iter)) break; } return result; } /* Moves to the next non-empty line. If @include_terminators * is set, the trailing run at the end of a line with an explicit * paragraph separator is considered non-empty. */ static gboolean next_nonempty_run (PangoLayoutIter *iter, gboolean include_terminators) { gboolean result; while (TRUE) { result = pango_layout_iter_next_run (iter); if (!result) break; if (iter->run) break; if (include_terminators && line_is_terminated (iter)) break; } return result; } /* Like pango_layout_next_cluster(), but if @include_terminators * is set, includes the fake runs/clusters for empty lines. * (But not positions introduced by line wrapping). */ static gboolean next_cluster_internal (PangoLayoutIter *iter, gboolean include_terminators) { PangoGlyphString *gs; int next_start; if (IS_INVALID (iter)) return FALSE; if (iter->run == NULL) return next_nonempty_line (iter, include_terminators); gs = iter->run->glyphs; next_start = iter->next_cluster_glyph; if (next_start == gs->num_glyphs) { return next_nonempty_run (iter, include_terminators); } else { iter->cluster_start = next_start; iter->cluster_x += iter->cluster_width; update_cluster(iter, gs->log_clusters[iter->cluster_start]); return TRUE; } } /** * pango_layout_iter_next_char: * @iter: a #PangoLayoutIter * * Moves @iter forward to the next character in visual order. If @iter was already at * the end of the layout, returns %FALSE. * * Return value: whether motion was possible **/ gboolean pango_layout_iter_next_char (PangoLayoutIter *iter) { const char *text; if (IS_INVALID (iter)) return FALSE; if (iter->run == NULL) { /* We need to fake an iterator position in the middle of a \r\n line terminator */ if (line_is_terminated (iter) && strncmp (iter->layout->text + iter->line->start_index + iter->line->length, "\r\n", 2) == 0 && iter->character_position == 0) { iter->character_position++; return TRUE; } return next_nonempty_line (iter, TRUE); } iter->character_position++; if (iter->character_position >= iter->cluster_num_chars) return next_cluster_internal (iter, TRUE); text = iter->layout->text; if (iter->ltr) iter->index = g_utf8_next_char (text + iter->index) - text; else iter->index = g_utf8_prev_char (text + iter->index) - text; return TRUE; } /** * pango_layout_iter_next_cluster: * @iter: a #PangoLayoutIter * * Moves @iter forward to the next cluster in visual order. If @iter * was already at the end of the layout, returns %FALSE. * * Return value: whether motion was possible **/ gboolean pango_layout_iter_next_cluster (PangoLayoutIter *iter) { return next_cluster_internal (iter, FALSE); } /** * pango_layout_iter_next_run: * @iter: a #PangoLayoutIter * * Moves @iter forward to the next run in visual order. If @iter was * already at the end of the layout, returns %FALSE. * * Return value: whether motion was possible **/ gboolean pango_layout_iter_next_run (PangoLayoutIter *iter) { int next_run_start; /* byte index */ GSList *next_link; if (IS_INVALID (iter)) return FALSE; if (iter->run == NULL) return pango_layout_iter_next_line (iter); next_link = iter->run_list_link->next; if (next_link == NULL) { /* Moving on to the zero-width "virtual run" at the end of each * line */ next_run_start = iter->run->item->offset + iter->run->item->length; iter->run = NULL; iter->run_list_link = NULL; } else { iter->run_list_link = next_link; iter->run = iter->run_list_link->data; next_run_start = iter->run->item->offset; } update_run (iter, next_run_start); return TRUE; } /** * pango_layout_iter_next_line: * @iter: a #PangoLayoutIter * * Moves @iter forward to the start of the next line. If @iter is * already on the last line, returns %FALSE. * * Return value: whether motion was possible **/ gboolean pango_layout_iter_next_line (PangoLayoutIter *iter) { GSList *next_link; if (IS_INVALID (iter)) return FALSE; next_link = iter->line_list_link->next; if (next_link == NULL) return FALSE; iter->line_list_link = next_link; pango_layout_line_unref (iter->line); iter->line = iter->line_list_link->data; pango_layout_line_ref (iter->line); iter->run_list_link = iter->line->runs; if (iter->run_list_link) iter->run = iter->run_list_link->data; else iter->run = NULL; iter->line_extents_link = iter->line_extents_link->next; g_assert (iter->line_extents_link != NULL); update_run (iter, iter->line->start_index); return TRUE; } /** * pango_layout_iter_get_char_extents: * @iter: a #PangoLayoutIter * @logical_rect: rectangle to fill with logical extents * * Gets the extents of the current character, in layout coordinates * (origin is the top left of the entire layout). Only logical extents * can sensibly be obtained for characters; ink extents make sense only * down to the level of clusters. * **/ void pango_layout_iter_get_char_extents (PangoLayoutIter *iter, PangoRectangle *logical_rect) { PangoRectangle cluster_rect; double x0, x1; if (IS_INVALID (iter)) return; if (logical_rect == NULL) return; pango_layout_iter_get_cluster_extents (iter, NULL, &cluster_rect); if (iter->run == NULL) { /* When on the NULL run, cluster, char, and run all have the * same extents */ *logical_rect = cluster_rect; return; } g_assert (cluster_rect.width == iter->cluster_width); x0 = ((double)iter->character_position * cluster_rect.width) / iter->cluster_num_chars; x1 = ((double)(iter->character_position + 1) * cluster_rect.width) / iter->cluster_num_chars; logical_rect->width = (int)x1 - (int)x0; logical_rect->height = cluster_rect.height; logical_rect->y = cluster_rect.y; logical_rect->x = cluster_rect.x + (int)x0; } /** * pango_layout_iter_get_cluster_extents: * @iter: a #PangoLayoutIter * @ink_rect: rectangle to fill with ink extents * @logical_rect: rectangle to fill with logical extents * * Gets the extents of the current cluster, in layout coordinates * (origin is the top left of the entire layout). * **/ void pango_layout_iter_get_cluster_extents (PangoLayoutIter *iter, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { if (IS_INVALID (iter)) return; if (iter->run == NULL) { /* When on the NULL run, cluster, char, and run all have the * same extents */ pango_layout_iter_get_run_extents (iter, ink_rect, logical_rect); return; } pango_glyph_string_extents_range (iter->run->glyphs, iter->cluster_start, iter->next_cluster_glyph, iter->run->item->analysis.font, ink_rect, logical_rect); if (ink_rect) { ink_rect->x += iter->cluster_x; offset_y (iter, &ink_rect->y); } if (logical_rect) { logical_rect->x += iter->cluster_x; offset_y (iter, &logical_rect->y); } } /** * pango_layout_iter_get_run_extents: * @iter: a #PangoLayoutIter * @ink_rect: rectangle to fill with ink extents * @logical_rect: rectangle to fill with logical extents * * Gets the extents of the current run in layout coordinates * (origin is the top left of the entire layout). * **/ void pango_layout_iter_get_run_extents (PangoLayoutIter *iter, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { IS_INVALID (iter); if (ink_rect) { if (iter->run) { pango_layout_run_get_extents (iter->run, ink_rect, NULL); offset_y (iter, &ink_rect->y); ink_rect->x += iter->run_x; } else { PangoRectangle line_ink; pango_layout_iter_get_line_extents (iter, &line_ink, NULL); ink_rect->x = iter->run_x; ink_rect->y = line_ink.y; ink_rect->width = 0; ink_rect->height = line_ink.height; } } if (logical_rect) *logical_rect = iter->run_logical_rect; } /** * pango_layout_iter_get_line_extents: * @iter: a #PangoLayoutIter * @ink_rect: rectangle to fill with ink extents * @logical_rect: rectangle to fill with logical extents * * Obtains the extents of the current line. @ink_rect or @logical_rect * can be NULL if you aren't interested in them. Extents are in layout * coordinates (origin is the top-left corner of the entire * #PangoLayout). Thus the extents returned by this function will be * the same width/height but not at the same x/y as the extents * returned from pango_layout_line_get_extents(). * **/ void pango_layout_iter_get_line_extents (PangoLayoutIter *iter, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { Extents *ext; if (IS_INVALID (iter)) return; ext = iter->line_extents_link->data; if (ink_rect) { get_line_extents_layout_coords (iter->layout, iter->line, iter->logical_rect.width, ext->logical_rect.y, NULL, ink_rect, NULL); } if (logical_rect) *logical_rect = ext->logical_rect; } /** * pango_layout_iter_get_line_yrange: * @iter: a #PangoLayoutIter * @y0_: start of line * @y1_: end of line * * Divides the vertical space in the #PangoLayout being iterated over * between the lines in the layout, and returns the space belonging to * the current line. A line's range includes the line's logical * extents, plus half of the spacing above and below the line, if * pango_layout_set_spacing() has been called to set layout spacing. * The y positions are in layout coordinates (origin at top left of the * entire layout). * **/ void pango_layout_iter_get_line_yrange (PangoLayoutIter *iter, int *y0, int *y1) { Extents *ext; int half_spacing; IS_INVALID (iter); ext = iter->line_extents_link->data; half_spacing = iter->layout->spacing / 2; /* Note that if layout->spacing is odd, the remainder spacing goes * above the line (this is pretty arbitrary of course) */ if (y0) { /* No spacing above the first line */ if (iter->line_extents_link == iter->line_extents) *y0 = ext->logical_rect.y; else *y0 = ext->logical_rect.y - (iter->layout->spacing - half_spacing); } if (y1) { /* No spacing below the last line */ if (iter->line_extents_link->next == NULL) *y1 = ext->logical_rect.y + ext->logical_rect.height; else *y1 = ext->logical_rect.y + ext->logical_rect.height + half_spacing; } } /** * pango_layout_iter_get_baseline: * @iter: a #PangoLayoutIter * * Gets the y position of the current line's baseline, in layout * coordinates (origin at top left of the entire layout). * * Return value: baseline of current line **/ int pango_layout_iter_get_baseline (PangoLayoutIter *iter) { Extents *ext; if (IS_INVALID (iter)) return 0; ext = iter->line_extents_link->data; return ext->baseline; } /** * pango_layout_iter_get_layout_extents: * @iter: a #PangoLayoutIter * @ink_rect: rectangle to fill with ink extents * @logical_rect: rectangle to fill with logical extents * * Obtains the extents of the #PangoLayout being iterated * over. @ink_rect or @logical_rect can be NULL if you * aren't interested in them. * **/ void pango_layout_iter_get_layout_extents (PangoLayoutIter *iter, PangoRectangle *ink_rect, PangoRectangle *logical_rect) { if (IS_INVALID (iter)) return; if (ink_rect) { /* expensive recomputation, woo-hoo */ pango_layout_get_extents (iter->layout, ink_rect, NULL); } if (logical_rect) *logical_rect = iter->logical_rect; }