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font rendering: Show ink rect too

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This commit is contained in:
Matthias Clasen 2019-07-25 22:06:34 -04:00
parent 0820a79bf5
commit df1892c052
1 changed files with 15 additions and 7 deletions
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22
demos/gtk-demo/fontrendering.c
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@ -31,7 +31,7 @@ update_image (void)
const char *text;
PangoFontDescription *desc;
PangoLayout *layout;
PangoRectangle ink, logical;
PangoRectangle ink, pink, logical;
int baseline;
cairo_surface_t *surface;
cairo_t *cr;
@ -79,6 +79,7 @@ update_image (void)
pango_layout_set_font_description (layout, desc);
pango_layout_set_text (layout, text, -1);
pango_layout_get_extents (layout, &ink, &logical);
pink = ink;
baseline = pango_layout_get_baseline (layout);
pango_extents_to_pixels (&ink, NULL);
@ -126,16 +127,23 @@ update_image (void)
cairo_set_source_rgba (cr, 0, 0, 1, 1);
cairo_rectangle (cr,
scale * (10 + (double)logical.x / PANGO_SCALE) - 0.5,
scale * (10 + (double)logical.y / PANGO_SCALE) - 0.5,
scale * ((double)logical.width / PANGO_SCALE) + 1,
scale * ((double)logical.height / PANGO_SCALE) + 1);
scale * (10 + logical.x / PANGO_SCALE) - 0.5,
scale * (10 + logical.y / PANGO_SCALE) - 0.5,
scale * (logical.width / PANGO_SCALE) + 1,
scale * (logical.height / PANGO_SCALE) + 1);
cairo_stroke (cr);
cairo_move_to (cr, scale * (10 + (double)logical.x / PANGO_SCALE) - 0.5,
cairo_move_to (cr, scale * (10 + logical.x / PANGO_SCALE) - 0.5,
scale * (10 + baseline / PANGO_SCALE) - 0.5);
cairo_line_to (cr, scale * (10 + (double)(logical.x + logical.width) / PANGO_SCALE) + 1,
cairo_line_to (cr, scale * (10 + (logical.x + logical.width) / PANGO_SCALE) + 1,
scale * (10 + baseline / PANGO_SCALE) - 0.5);
cairo_stroke (cr);
cairo_set_source_rgba (cr, 1, 0, 0, 1);
cairo_rectangle (cr,
scale * (10 + pink.x / PANGO_SCALE) + 0.5,
scale * (10 + pink.y / PANGO_SCALE) + 0.5,
scale * (pink.width / PANGO_SCALE) - 0.5,
scale * (pink.height / PANGO_SCALE) - 0.5);
cairo_stroke (cr);
cairo_surface_destroy (surface);
}
else