[gtk/glyphy2: 51/53] glyphy: Implement synthetic bold
- From: Matthias Clasen <matthiasc src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/glyphy2: 51/53] glyphy: Implement synthetic bold
- Date: Tue, 5 Apr 2022 01:53:59 +0000 (UTC)
commit dd020b863555756a042b845c794389a7cb621d66
Author: Matthias Clasen <mclasen redhat com>
Date: Mon Apr 4 01:44:51 2022 -0400
glyphy: Implement synthetic bold
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.
gsk/gl/gskglrenderjob.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
---
diff --git a/gsk/gl/gskglrenderjob.c b/gsk/gl/gskglrenderjob.c
index 963ecf401a..6f6f45772e 100644
--- a/gsk/gl/gskglrenderjob.c
+++ b/gsk/gl/gskglrenderjob.c
@@ -33,6 +33,7 @@
#include <gsk/gskroundedrectprivate.h>
#include <math.h>
#include <string.h>
+#include <pango/pangofc-font.h>
#include "gskglcommandqueueprivate.h"
#include "gskgldriverprivate.h"
@@ -3123,6 +3124,21 @@ 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)
+{
+ 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;
+ }
+
+ return FALSE;
+}
+
static inline void
gsk_gl_render_job_visit_text_node_glyphy (GskGLRenderJob *job,
const GskRenderNode *node,
@@ -3146,6 +3162,7 @@ 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));
@@ -3156,6 +3173,8 @@ 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);
@@ -3218,6 +3237,10 @@ 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,
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