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gtk-demo: Font rendering - improve the grid

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Allow changing the character shown in the grid.
This commit is contained in:
Matthias Clasen 2021-09-04 20:28:59 -04:00
parent b77938f40f
commit 7c3fbdecf2
1 changed files with 19 additions and 4 deletions
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23
demos/gtk-demo/fontrendering.c
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@ -167,10 +167,26 @@ update_image (void)
PangoLayoutRun *run; PangoLayoutRun *run;
PangoGlyphInfo *g; PangoGlyphInfo *g;
int i, j; int i, j;
GString *str;
gunichar ch;
if (*text == '\0')
text = " ";
ch = g_utf8_get_char (text);
str = g_string_new ("");
for (i = 0; i < 4; i++)
{
g_string_append_unichar (str, ch);
g_string_append_unichar (str, 0x200c);
}
layout = pango_layout_new (context); layout = pango_layout_new (context);
pango_layout_set_font_description (layout, desc); pango_layout_set_font_description (layout, desc);
pango_layout_set_text (layout, "aaaa", -1); pango_layout_set_text (layout, str->str, -1);
g_string_free (str, TRUE);
pango_layout_get_extents (layout, &ink, &logical); pango_layout_get_extents (layout, &ink, &logical);
pango_extents_to_pixels (&logical, NULL); pango_extents_to_pixels (&logical, NULL);
@ -185,7 +201,7 @@ update_image (void)
cairo_set_source_rgb (cr, 0, 0, 0); cairo_set_source_rgb (cr, 0, 0, 0);
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
{ {
g = &(run->glyphs->glyphs[i]); g = &(run->glyphs->glyphs[2*i]);
g->geometry.width = PANGO_UNITS_ROUND (g->geometry.width * 3 / 2); g->geometry.width = PANGO_UNITS_ROUND (g->geometry.width * 3 / 2);
} }
@ -193,7 +209,7 @@ update_image (void)
{ {
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
{ {
g = &(run->glyphs->glyphs[i]); g = &(run->glyphs->glyphs[2*i]);
g->geometry.x_offset = i * (PANGO_SCALE / 4); g->geometry.x_offset = i * (PANGO_SCALE / 4);
g->geometry.y_offset = j * (PANGO_SCALE / 4); g->geometry.y_offset = j * (PANGO_SCALE / 4);
} }
@ -212,7 +228,6 @@ update_image (void)
cairo_surface_destroy (surface); cairo_surface_destroy (surface);
} }
gtk_picture_set_pixbuf (GTK_PICTURE (image), pixbuf2); gtk_picture_set_pixbuf (GTK_PICTURE (image), pixbuf2);
g_object_unref (pixbuf2); g_object_unref (pixbuf2);