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Handle SOURCE and CLEAR operators when painting color glyphs

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In cairo, most operators are composited this way:

  ((src IN mask) OP dst) LERP_clip dst

but SOURCE and CLEAR operators are composited this way:

  (src OP dst) LERP_(clip IN mask) dst

(why is this not specified anywhere in the docs or source tree?)

With color glyphs, we were not special-casing SOURCE and CLEAR.
We do now.

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=102661
This commit is contained in:
Behdad Esfahbod 2017-09-12 01:35:15 -04:00
parent 7f6b57a238
commit 99427c3f4f
1 changed files with 4 additions and 1 deletions
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5
src/cairo-surface.c
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@ -2571,7 +2571,10 @@ composite_one_color_glyph (cairo_surface_t *surface,
pattern = cairo_pattern_create_for_surface ((cairo_surface_t *)glyph_surface);
cairo_matrix_init_translate (&matrix, - x, - y);
cairo_pattern_set_matrix (pattern, &matrix);
status = surface->backend->paint (surface, op, pattern, clip);
if (op == CAIRO_OPERATOR_SOURCE || op == CAIRO_OPERATOR_CLEAR)
status = surface->backend->mask (surface, op, pattern, pattern, clip);
else
status = surface->backend->paint (surface, op, pattern, clip);
}
return status;