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#include "config.h"
#include "pango-run-private.h"
#include "pango-attr-private.h"
#include "pango-item-private.h"
#include "pango-impl-utils.h"
#include "pango-font-metrics-private.h"
#include "pango-attributes-private.h"
#include <math.h>
/**
* Pango2Run:
*
* A `Pango2Run` represents a single run within a `Pango2Line`.
*
* A run is a range of text with uniform script, font and attributes that
* is shaped as a unit.
*
* Script, font and attributes of a run can be accessed via
* [method@Pango2.Run.get_item]. The glyphs that result from shaping
* the text of the run can be obtained via [method@Pango2.Run.get_glyphs].
*/
/**
* pango2_run_get_item:
* @run: a `Pango2Run`
*
* Gets the `Pango2Item` for the run.
*
* Returns: (transfer none): the `Pango2Item` of @run
*/
Pango2Item *
pango2_run_get_item (Pango2Run *run)
{
return run->glyph_item.item;
}
/**
* pango2_run_get_glyphs:
* @run: a `Pango2Run`
*
* Gets the `Pango2GlyphString` for the run.
*
* Returns: (transfer none): the `Pango2GlyphString` of @run
*/
Pango2GlyphString *
pango2_run_get_glyphs (Pango2Run *run)
{
return run->glyph_item.glyphs;
}
static void
pango2_shape_get_extents (int n_chars,
Pango2Attribute *attr,
Pango2Rectangle *ink_rect,
Pango2Rectangle *logical_rect)
{
if (n_chars > 0)
{
ShapeData *data = (ShapeData *)attr->pointer_value;
Pango2Rectangle *shape_ink = &data->ink_rect;
Pango2Rectangle *shape_logical = &data->logical_rect;
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;
}
}
}
/**
* pango2_run_get_extents:
* @run: a `Pango2Run`
* @trim: `Pango2LeadingTrim` flags
* @ink_rect: (out caller-allocates) (optional): return location
* for the ink extents
* @logical_rect: (out caller-allocates) (optional): return location
* for the logical extents
*
* Gets the extents of a `Pango2Run`.
*
* The @trim flags specify if line-height attributes are taken
* into consideration for determining the logical height. See the
* [CSS inline layout](https://www.w3.org/TR/css-inline-3/#inline-height)
* specification for details.
*/
void
pango2_run_get_extents (Pango2Run *run,
Pango2LeadingTrim trim,
Pango2Rectangle *ink_rect,
Pango2Rectangle *logical_rect)
{
Pango2GlyphItem *glyph_item = &run->glyph_item;
ItemProperties properties;
gboolean has_underline;
gboolean has_overline;
gboolean has_strikethrough;
Pango2Rectangle logical;
Pango2FontMetrics *metrics = NULL;
int y_offset;
pango2_item_get_properties (glyph_item->item, &properties);
has_underline = properties.uline_style != PANGO2_LINE_STYLE_NONE;
has_overline = properties.oline_style != PANGO2_LINE_STYLE_NONE;
has_strikethrough = properties.strikethrough_style != PANGO2_LINE_STYLE_NONE;
if (!logical_rect && (glyph_item->item->analysis.flags & PANGO2_ANALYSIS_FLAG_CENTERED_BASELINE))
logical_rect = &logical;
if (!logical_rect && (has_underline || has_overline || has_strikethrough))
logical_rect = &logical;
if (properties.shape)
pango2_shape_get_extents (glyph_item->item->num_chars, properties.shape,
ink_rect, logical_rect);
else
pango2_glyph_string_extents (glyph_item->glyphs, glyph_item->item->analysis.font,
ink_rect, logical_rect);
if (ink_rect && (has_underline || has_overline || has_strikethrough))
{
int underline_thickness;
int underline_position;
int strikethrough_thickness;
int strikethrough_position;
int new_pos;
if (!metrics)
metrics = pango2_font_get_metrics (glyph_item->item->analysis.font,
glyph_item->item->analysis.language);
underline_thickness = pango2_font_metrics_get_underline_thickness (metrics);
underline_position = pango2_font_metrics_get_underline_position (metrics);
strikethrough_thickness = pango2_font_metrics_get_strikethrough_thickness (metrics);
strikethrough_position = pango2_font_metrics_get_strikethrough_position (metrics);
/* the underline/strikethrough takes x, width of logical_rect.
* Reflect that into ink_rect.
*/
new_pos = MIN (ink_rect->x, logical_rect->x);
ink_rect->width = MAX (ink_rect->x + ink_rect->width, logical_rect->x + logical_rect->width) - new_pos;
ink_rect->x = new_pos;
/* We should better handle the case of height==0 in the following cases.
* If ink_rect->height == 0, we should adjust ink_rect->y appropriately.
*/
if (has_strikethrough)
{
if (ink_rect->height == 0)
{
ink_rect->height = strikethrough_thickness;
ink_rect->y = -strikethrough_position;
}
}
if (properties.oline_style == PANGO2_LINE_STYLE_SOLID ||
properties.oline_style == PANGO2_LINE_STYLE_DASHED ||
properties.oline_style == PANGO2_LINE_STYLE_DOTTED)
{
ink_rect->y -= underline_thickness;
ink_rect->height += underline_thickness;
}
else if (properties.oline_style == PANGO2_LINE_STYLE_DOUBLE ||
properties.oline_style == PANGO2_LINE_STYLE_WAVY)
{
ink_rect->y -= 3 * underline_thickness;
ink_rect->height += 3 * underline_thickness;
}
if (properties.uline_style == PANGO2_LINE_STYLE_SOLID ||
properties.uline_style == PANGO2_LINE_STYLE_DASHED ||
properties.uline_style == PANGO2_LINE_STYLE_DOTTED)
{
if (properties.uline_position == PANGO2_UNDERLINE_POSITION_UNDER)
ink_rect->height += 2 * underline_thickness;
else
ink_rect->height = MAX (ink_rect->height,
underline_thickness - underline_position - ink_rect->y);
}
else if (properties.uline_style == PANGO2_LINE_STYLE_DOUBLE ||
properties.uline_style == PANGO2_LINE_STYLE_WAVY)
{
if (properties.uline_position == PANGO2_UNDERLINE_POSITION_UNDER)
ink_rect->height += 4 * underline_thickness;
else
ink_rect->height = MAX (ink_rect->height,
3 * underline_thickness - underline_position - ink_rect->y);
}
}
y_offset = glyph_item->y_offset;
if (glyph_item->item->analysis.flags & PANGO2_ANALYSIS_FLAG_CENTERED_BASELINE)
{
gboolean is_hinted = (logical_rect->y & logical_rect->height & (PANGO2_SCALE - 1)) == 0;
int adjustment = logical_rect->y + logical_rect->height / 2;
if (is_hinted)
adjustment = PANGO2_UNITS_ROUND (adjustment);
y_offset += adjustment;
}
if (ink_rect)
ink_rect->y -= y_offset;
if (logical_rect)
logical_rect->y -= y_offset;
if (logical_rect && trim != PANGO2_LEADING_TRIM_BOTH)
{
int leading;
if (properties.absolute_line_height != 0 || properties.line_height != 0.0)
{
int line_height;
line_height = MAX (properties.absolute_line_height, ceilf (properties.line_height * logical_rect->height));
leading = (line_height - logical_rect->height);
}
else
{
/* line-height 'normal' in the CSS inline layout spec */
if (!metrics)
metrics = pango2_font_get_metrics (glyph_item->item->analysis.font,
glyph_item->item->analysis.language);
leading = MAX (metrics->height - (metrics->ascent + metrics->descent) + properties.line_spacing, 0);
}
if ((trim & PANGO2_LEADING_TRIM_START) == 0)
logical_rect->y -= leading / 2;
if (trim == PANGO2_LEADING_TRIM_NONE)
logical_rect->height += leading;
else
logical_rect->height += (leading - leading / 2);
}
if (metrics)
pango2_font_metrics_free (metrics);
}
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