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/* Pango
* fonts.c:
*
* Copyright (C) 1999 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 <stdlib.h>
#include <ctype.h>
#include "pango.h"
/**
* pango_font_description_copy:
* @desc: a #PangoFontDescription
*
* Make a copy of a #PangoFontDescription.
*
* Return value: a newly allocated #PangoFontDescription. This value
* must be freed using pango_font_description_free().
**/
PangoFontDescription *
pango_font_description_copy (const PangoFontDescription *desc)
{
PangoFontDescription *result = g_new (PangoFontDescription, 1);
*result = *desc;
result->family_name = g_strdup (result->family_name);
return result;
}
/**
* pango_font_description_compare:
* @desc1: a #PangoFontDescription
* @desc2: another #PangoFontDescription
*
* Compare two font descriptions for equality.
*
* Return value: %TRUE if the two font descriptions are proveably
* identical. (Two font descriptions may result in
* identical fonts being loaded, but still compare
* %FALSE.)
**/
gboolean
pango_font_description_compare (const PangoFontDescription *desc1,
const PangoFontDescription *desc2)
{
g_return_val_if_fail (desc1 != NULL, FALSE);
g_return_val_if_fail (desc2 != NULL, FALSE);
return (desc1->style == desc2->style &&
desc1->variant == desc2->variant &&
desc1->weight == desc2->weight &&
desc1->stretch == desc2->stretch &&
desc1->size == desc2->size &&
g_strcasecmp (desc1->family_name, desc2->family_name));
}
/**
* pango_font_description_free:
* @desc: a #PangoFontDescription
*
* Free a font description returned from pango_font_describe()
* or pango_font_description_copy().
**/
void pango_font_description_free (PangoFontDescription *desc)
{
if (desc)
{
if (desc->family_name)
g_free (desc->family_name);
g_free (desc);
}
}
/**
* pango_font_descriptions_free:
* @descs: a pointer to an array of #PangoFontDescription
* @n_descs: number of font descriptions in @descs
*
* Free a list of font descriptions from pango_font_map_list_fonts()
**/
void
pango_font_descriptions_free (PangoFontDescription **descs,
int n_descs)
{
int i;
if (descs)
{
for (i = 0; i<n_descs; i++)
pango_font_description_free (descs[i]);
g_free (descs);
}
}
typedef struct
{
int value;
const char *str;
} FieldMap;
FieldMap style_map[] = {
{ PANGO_STYLE_NORMAL, NULL },
{ PANGO_STYLE_OBLIQUE, "Oblique" },
{ PANGO_STYLE_ITALIC, "Italic" }
};
FieldMap variant_map[] = {
{ PANGO_VARIANT_NORMAL, NULL },
{ PANGO_VARIANT_SMALL_CAPS, "Small-Caps" }
};
FieldMap weight_map[] = {
{ 300, "Light" },
{ PANGO_WEIGHT_NORMAL, NULL },
{ 500, "Medium" },
{ 600, "Semi-Bold" },
{ PANGO_WEIGHT_BOLD, "Bold" }
};
FieldMap stretch_map[] = {
{ PANGO_STRETCH_ULTRA_CONDENSED, "Ultra-Condensed" },
{ PANGO_STRETCH_EXTRA_CONDENSED, "Extra-Condensed" },
{ PANGO_STRETCH_CONDENSED, "Condensed" },
{ PANGO_STRETCH_SEMI_CONDENSED, "Semi-Condensed" },
{ PANGO_STRETCH_NORMAL, NULL },
{ PANGO_STRETCH_SEMI_EXPANDED, "Semi-Expanded" },
{ PANGO_STRETCH_EXPANDED, "Expanded" },
{ PANGO_STRETCH_EXTRA_EXPANDED, "Extra-Expanded" },
{ PANGO_STRETCH_ULTRA_EXPANDED, "Ultra-Expanded" }
};
static gboolean
find_field (FieldMap *map, int n_elements, const char *str, int len, int *val)
{
int i;
for (i=0; i<n_elements; i++)
{
if (map[i].str && g_strncasecmp (map[i].str, str, len) == 0)
{
if (val)
*val = map[i].value;
return TRUE;
}
}
return FALSE;
}
static gboolean
find_field_any (const char *str, int len, PangoFontDescription *desc)
{
return (g_strcasecmp (str, "Normal") == 0 ||
find_field (style_map, G_N_ELEMENTS (style_map), str, len,
desc ? (int *)&desc->style : NULL) ||
find_field (variant_map, G_N_ELEMENTS (variant_map), str, len,
desc ? (int *)&desc->variant : NULL) ||
find_field (weight_map, G_N_ELEMENTS (weight_map), str, len,
desc ? (int *)&desc->weight : NULL) ||
find_field (stretch_map, G_N_ELEMENTS (stretch_map), str, len,
desc ? (int *)&desc->stretch : NULL));
}
static const char *
getword (const char *str, const char *last, size_t *wordlen)
{
const char *result;
while (last > str && isspace (*(last - 1)))
last--;
result = last;
while (result > str && !isspace (*(result - 1)))
result--;
*wordlen = last - result;
return result;
}
/**
* pango_font_description_from_string:
* @str: string reprentation of a font description.
*
* Create a new font description from a string representation in the
* form "[FAMILY-LIST] [STYLE-OPTIONS] [SIZE]", where FAMILY-LIST is a
* comma separated list of families optionally terminated by a comma,
* STYLE_OPTIONS is a whitespace separated list of words where each
* WORD describes one of style, variant, weight, or stretch, and SIZE
* is an decimal number (size in points). Any one of the options may
* be absent. If FAMILY-LIST is absent, then the family_name field of
* the resulting font description will be initialized to NULL. If
* STYLE-OPTIONS is missing, then all style options will be set to the
* default values. If SIZE is missing, the size in the resulting font
* description will be set to 0.
*
* Return value: a new #PangoFontDescription, or %NULL if the
* string could not be parsed.
**/
PangoFontDescription *
pango_font_description_from_string (const char *str)
{
PangoFontDescription *desc;
const char *p, *last;
size_t len, wordlen;
g_return_val_if_fail (str != NULL, NULL);
desc = g_new (PangoFontDescription, 1);
desc->family_name = NULL;
desc->style = PANGO_STYLE_NORMAL;
desc->weight = PANGO_WEIGHT_NORMAL;
desc->variant = PANGO_VARIANT_NORMAL;
desc->stretch = PANGO_STRETCH_NORMAL;
desc->size = 0;
len = strlen (str);
last = str + len;
p = getword (str, last, &wordlen);
/* Look for a size at the end of the string
*/
if (wordlen != 0)
{
char *end;
double size = strtod (p, &end);
if (end - p == wordlen) /* word is a valid float */
{
desc->size = (int)(size * 1000 + 0.5);
last = p;
}
}
/* Now parse style words
*/
p = getword (str, last, &wordlen);
while (wordlen != 0)
{
if (!find_field_any (p, wordlen, desc))
break;
else
{
last = p;
p = getword (str, last, &wordlen);
}
}
/* Remainder (str => p) is family list. Trim off trailing commas and leading and trailing white space
*/
while (last > str && isspace (*(last - 1)))
last--;
if (last > str && *(last - 1) == ',')
last--;
while (last > str && isspace (*(last - 1)))
last--;
while (isspace (*str))
str++;
if (str != last)
desc->family_name = g_strndup (str, last - str);
return desc;
}
static void
append_field (GString *str, FieldMap *map, int n_elements, int val)
{
int i;
for (i=0; i<n_elements; i++)
{
if (map[i].value == val)
{
if (map[i].str)
{
if (str->len != 0)
g_string_append_c (str, ' ');
g_string_append (str, map[i].str);
}
return;
}
}
if (str->len != 0)
g_string_append_c (str, ' ');
g_string_sprintfa (str, "%d", val);
}
/**
* pango_font_description_to_string:
* @desc: a #PangoFontDescription
*
* Create a string representation of a font description. See
* pango_font_description_from_string() for a description of the
* format of the string representation. The family list in the
* string description will only have a terminating comma if the
* last word of the list is a valid style option.
*
* Return value: a new string that must be freed with g_free().
**/
char *
pango_font_description_to_string (const PangoFontDescription *desc)
{
GString *result = g_string_new (NULL);
char *str;
if (desc->family_name)
{
const char *p;
size_t wordlen;
g_string_append (result, desc->family_name);
p = getword (desc->family_name, desc->family_name + strlen(desc->family_name), &wordlen);
if (wordlen != 0 && find_field_any (p, wordlen, NULL))
g_string_append_c (result, ',');
}
append_field (result, weight_map, G_N_ELEMENTS (weight_map), desc->weight);
append_field (result, style_map, G_N_ELEMENTS (style_map), desc->style);
append_field (result, stretch_map, G_N_ELEMENTS (stretch_map), desc->stretch);
append_field (result, variant_map, G_N_ELEMENTS (variant_map), desc->variant);
if (result->len == 0)
g_string_append (result, "Normal");
if (desc->size > 0)
{
if (result->len == 0)
g_string_append_c (result, ' ');
g_string_sprintfa (result, "%f", desc->size / 1000.);
}
str = result->str;
g_string_free (result, FALSE);
return str;
}
/**
* pango_font_init:
* @font: a #PangoFont
*
* Initialize a #PangoFont structure. This should
* only be called from the "new" routine of code which
* is implementing a "subclass" of #PangoFont
*/
void
pango_font_init (PangoFont *font)
{
g_return_if_fail (font != NULL);
g_datalist_init (&font->data);
font->ref_count = 1;
}
/**
* pango_font_ref:
* @font: a #PangoFont
*
* Increase the reference count of a #PangoFont.
*/
void
pango_font_ref (PangoFont *font)
{
g_return_if_fail (font != NULL);
font->ref_count++;
}
/**
* pango_font_unref:
* @font: a #PangoFont
*
* Decrease the reference count of a #PangoFont.
* if the result is zero, destroy the font
* and free the associated memory.
*/
void
pango_font_unref (PangoFont *font)
{
g_return_if_fail (font != NULL);
g_return_if_fail (font->ref_count > 0);
font->ref_count--;
if (font->ref_count == 0)
{
g_datalist_clear (&font->data);
font->klass->destroy (font);
}
}
/**
* pango_font_set_data:
* @font: a #PangoFont
* @key: a string identifying the type of user data.
* @data: the data to store. If %NULL, the current
* data for the key will be removed.
* @destroy_func: a function to call when the data is no
* longer stored, either because the font has
* been destroyed, or because the data has
* been replaced. This can be %NULL, in which
* case no function will be called.
*
* Associate user data, tagged with a string id, with a particular
* font.
*/
void
pango_font_set_data (PangoFont *font,
gchar *key,
gpointer data,
GDestroyNotify destroy_func)
{
g_datalist_set_data_full (&font->data, key, data, destroy_func);
}
/**
* pango_font_get_data:
* @font: a #PangoFont
* @key: a string identifying the type of user data.
*
* Look up user data tagged with a particular key.
*
* Returns the data, or NULL if that key does not exist.
*/
gpointer
pango_font_get_data (PangoFont *font,
gchar *key)
{
return g_datalist_get_data (&font->data, key);
}
/**
* pango_font_get_coverage:
* @font: a #PangoFont
* @lang: the language tag (in the form of "en_US")
*
* Compute the coverage map for a given font and language tag.
*
* Return value: a newly allocated #PangoContext object.
**/
PangoCoverage *
pango_font_get_coverage (PangoFont *font,
const char *lang)
{
g_return_val_if_fail (font != NULL, NULL);
g_return_val_if_fail (lang != NULL, NULL);
return font->klass->get_coverage (font, lang);
}
/**
* pango_font_find_shaper:
* @font: a #PangoFont
* @lang: the language tag (in the form of "en_US")
* @ch: the ISO-10646 character code.
*
* Find the best matching shaper for a font for a particular
* language tag and character point.
*
* Return value: the best matching shaper.
**/
PangoEngineShape *
pango_font_find_shaper (PangoFont *font,
const char *lang,
guint32 ch)
{
g_return_val_if_fail (font != NULL, NULL);
g_return_val_if_fail (lang != NULL, NULL);
return font->klass->find_shaper (font, lang, ch);
}
/**
* pango_font_get_glyph_extents:
* @font: a #PangoFont
* @glyph: the glyph index
* @ink_rect: rectangle used to store the extents of the glyph as drawn
* or %NULL to indicate that the result is not needed.
* @logical_rect: rectangle used to store the logical extents of the glyph
* or %NULL to indicate that the result is not needed.
*
* Get the logical and ink extents of a glyph within a font. The
* coordinate system for each rectangle has its origin at the
* base line and horizontal origin of the character with increasing
* coordinates extending to the right and down. The macros PANGO_ASCENT(),
* PANGO_DESCENT(), PANGO_LBEARING(), and PANGO_RBEARING can be used to convert
* from the extents rectangle to more traditional font metrics. The units
* of the rectangles are in 1000ths of a device unit.
**/
void
pango_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
g_return_if_fail (font != NULL);
font->klass->get_glyph_extents (font, glyph, ink_rect, logical_rect);
}
/**
* pango_font_map_init:
* @fontmap: a #PangoFontMap
*
* Initialize a #PangoFontMap structure. This should
* only be called from the "new" routine of code which
* is implementing a "subclass" of #PangoFontMap
*/
void
pango_font_map_init (PangoFontMap *fontmap)
{
g_return_if_fail (fontmap != NULL);
fontmap->ref_count = 1;
}
/**
* pango_font_map_ref:
* @fontmap: a #PangoFontMap
*
* Increase the reference count of a #PangoFontMap.
*/
void
pango_font_map_ref (PangoFontMap *fontmap)
{
g_return_if_fail (fontmap != NULL);
fontmap->ref_count++;
}
/**
* pango_font_map_unref:
* @fontmap: a #PangoFontMap
*
* Decrease the reference count of a #PangoFontMap.
* if the result is zero, destroy the font
* and free the associated memory.
*/
void
pango_font_map_unref (PangoFontMap *fontmap)
{
g_return_if_fail (fontmap != NULL);
g_return_if_fail (fontmap->ref_count > 0);
fontmap->ref_count--;
if (fontmap->ref_count == 0)
fontmap->klass->destroy (fontmap);
}
/**
* pango_font_map_load_font:
* @fontmap: a #PangoFontMap
* @desc: a #PangoFontDescription describing the font to load
*
* Load the font in the fontmap that is the closest match for @desc.
*
* Returns the font loaded, or %NULL if no font matched.
**/
PangoFont *
pango_font_map_load_font (PangoFontMap *fontmap,
const PangoFontDescription *desc)
{
g_return_val_if_fail (fontmap != NULL, NULL);
return fontmap->klass->load_font (fontmap, desc);
}
/**
* pango_font_map_list_fonts:
* @fontmap: a #PangoFontMap
* @family: the family for which to list the fonts, or %NULL
* to list fonts in all families.
* @descs: location to store a pointer to an array of pointers to
* #PangoFontDescription. This array should be freed
* with pango_font_descriptions_free().
* @n_descs: location to store the number of elements in @descs
*
* List all fonts in a fontmap, or the fonts in a particular family.
**/
void
pango_font_map_list_fonts (PangoFontMap *fontmap,
const char *family,
PangoFontDescription ***descs,
int *n_descs)
{
g_return_if_fail (fontmap != NULL);
fontmap->klass->list_fonts (fontmap, family, descs, n_descs);
}
/**
* pango_font_map_list_families:
* @fontmap: a #PangoFontMap
* @families: location to store a pointer to an array of strings.
* This array should be freed with pango_font_map_free_families().
* @n_families: location to store the number of elements in @descs
*
* List all families for a fontmap.
**/
void
pango_font_map_list_families (PangoFontMap *fontmap,
gchar ***families,
int *n_families)
{
g_return_if_fail (fontmap != NULL);
fontmap->klass->list_families (fontmap, families, n_families);
}
/**
* pango_font_map_free_families:
* @families: a list of families
* @n_families: number of elements in @families
*
* Free a list of families returned from pango_font_map_list_families()
**/
void
pango_font_map_free_families (gchar **families,
int n_families)
{
int i;
g_return_if_fail (n_families == 0 || families != NULL);
for (i=0; i<n_families; i++)
g_free (families[i]);
g_free (families);
}
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