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#include "config.h"
#include "pango-layout-run-private.h"
#include "pango-item-private.h"
#include "pango-impl-utils.h"
#include <math.h>
PangoItem *
pango_layout_run_get_item (PangoLayoutRun *run)
{
return run->item;
}
PangoGlyphString *
pango_layout_run_get_glyphs (PangoLayoutRun *run)
{
return run->glyphs;
}
/**
* pango_layout_run_get_extents:
* @run: a `PangoLayoutRun`
* @trim: `PangoLeadingTrim` 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 `PangoLayoutRun`.
*
* 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
pango_layout_run_get_extents (PangoLayoutRun *run,
PangoLeadingTrim trim,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
PangoGlyphItem *glyph_item = run;
ItemProperties properties;
gboolean has_underline;
gboolean has_overline;
PangoRectangle logical;
PangoFontMetrics *metrics = NULL;
int y_offset;
pango_item_get_properties (glyph_item->item, &properties);
has_underline = properties.uline_single || properties.uline_double ||
properties.uline_low || properties.uline_error;
has_overline = properties.oline_single;
if (!logical_rect && (glyph_item->item->analysis.flags & PANGO_ANALYSIS_FLAG_CENTERED_BASELINE))
logical_rect = &logical;
if (!logical_rect && (has_underline || has_overline || properties.strikethrough))
logical_rect = &logical;
if (properties.shape_set)
_pango_shape_get_extents (glyph_item->item->num_chars,
properties.shape_ink_rect, properties.shape_logical_rect,
ink_rect, logical_rect);
else
pango_glyph_string_extents (glyph_item->glyphs, glyph_item->item->analysis.font,
ink_rect, logical_rect);
if (ink_rect && (has_underline || has_overline || properties.strikethrough))
{
int underline_thickness;
int underline_position;
int strikethrough_thickness;
int strikethrough_position;
int new_pos;
if (!metrics)
metrics = pango_font_get_metrics (glyph_item->item->analysis.font,
glyph_item->item->analysis.language);
underline_thickness = pango_font_metrics_get_underline_thickness (metrics);
underline_position = pango_font_metrics_get_underline_position (metrics);
strikethrough_thickness = pango_font_metrics_get_strikethrough_thickness (metrics);
strikethrough_position = pango_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 (properties.strikethrough)
{
if (ink_rect->height == 0)
{
ink_rect->height = strikethrough_thickness;
ink_rect->y = -strikethrough_position;
}
}
if (properties.oline_single)
{
ink_rect->y -= underline_thickness;
ink_rect->height += underline_thickness;
}
if (properties.uline_low)
ink_rect->height += 2 * underline_thickness;
if (properties.uline_single)
ink_rect->height = MAX (ink_rect->height,
underline_thickness - underline_position - ink_rect->y);
if (properties.uline_double)
ink_rect->height = MAX (ink_rect->height,
3 * underline_thickness - underline_position - ink_rect->y);
if (properties.uline_error)
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 & PANGO_ANALYSIS_FLAG_CENTERED_BASELINE)
{
gboolean is_hinted = (logical_rect->y & logical_rect->height & (PANGO_SCALE - 1)) == 0;
int adjustment = logical_rect->y + logical_rect->height / 2;
if (is_hinted)
adjustment = PANGO_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 != PANGO_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 = pango_font_get_metrics (glyph_item->item->analysis.font,
glyph_item->item->analysis.language);
leading = MAX (metrics->height - (metrics->ascent + metrics->descent), 0);
}
if ((trim & PANGO_LEADING_TRIM_START) == 0)
logical_rect->y -= leading / 2;
if (trim == PANGO_LEADING_TRIM_NONE)
logical_rect->height += leading;
else
logical_rect->height += (leading - leading / 2);
}
if (metrics)
pango_font_metrics_unref (metrics);
}
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