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glyphy: Implement synthetic bold

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When the font appears to be synthetic bold (as
indicated by th embolden property in FcPattern),
use glyphys boldness uniform to render the font
bolder.
This commit is contained in:
Matthias Clasen
2022-04-04 01:44:51 -04:00
parent c1d7a820ab
commit f3b00d075e
1 changed files with 27 additions and 0 deletions
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27
gsk/gl/gskglrenderjob.c
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@@ -35,6 +35,9 @@
#include <gsk/gskrectprivate.h>
#include <math.h>
#include <string.h>
#ifdef HAVE_PANGOFT
#include <pango/pangofc-font.h>
#endif
#include "gskglcommandqueueprivate.h"
#include "gskgldriverprivate.h"
@@ -3150,6 +3153,23 @@ add_encoded_glyph (GskGLDrawVertex *vertices,
*vertices = (GskGLDrawVertex) { .position = { eg->x, eg->y}, .uv = { eg->g16hi, eg->g16lo}, .color = { c[0], c[1], c[2], c[3] } };
}
static gboolean
font_is_synthetic_bold (PangoFont *font)
{
#ifdef HAVE_PANGOFT
if (PANGO_IS_FC_FONT (font))
{
FcPattern *pattern = pango_fc_font_get_pattern (PANGO_FC_FONT (font));
gboolean ret;
if (FcPatternGetBool (pattern, FC_EMBOLDEN, 0, &ret) == FcResultMatch)
return ret;
}
#endif
return FALSE;
}
static inline void
gsk_gl_render_job_visit_text_node_glyphy (GskGLRenderJob *job,
const GskRenderNode *node,
@@ -3173,6 +3193,7 @@ gsk_gl_render_job_visit_text_node_glyphy (GskGLRenderJob *job,
guint i;
int x_position = 0;
float font_scale;
gboolean synthetic_bold;
g_assert (!gsk_text_node_has_color_glyphs (node));
@@ -3183,6 +3204,8 @@ gsk_gl_render_job_visit_text_node_glyphy (GskGLRenderJob *job,
return;
font = (PangoFont *)gsk_text_node_get_font (node);
synthetic_bold = font_is_synthetic_bold (font);
glyphs = gsk_text_node_get_glyphs (node, NULL);
library = job->driver->glyphy_library;
offset = gsk_text_node_get_offset (node);
@@ -3245,6 +3268,10 @@ gsk_gl_render_job_visit_text_node_glyphy (GskGLRenderJob *job,
gsk_gl_program_set_uniform1f (job->current_program,
UNIFORM_GLYPHY_CONTRAST, 0,
1.0);
gsk_gl_program_set_uniform1f (job->current_program,
UNIFORM_GLYPHY_BOLDNESS, 0,
synthetic_bold ? 0.1 : 0.0);
#if 0
gsk_gl_program_set_uniform1f (job->current_program,
UNIFORM_GLYPHY_OUTLINE_THICKNESS, 0,