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xlib: ADD only reduces to SOURCE for alpha-only targets

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Fixes operator.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-11-23 14:57:35 +00:00
parent 44a868b552
commit e217677ce6
1 changed files with 6 additions and 2 deletions
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8
src/cairo-xlib-render-compositor.c
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@ -313,8 +313,12 @@ fill_reduces_to_source (cairo_operator_t op,
const cairo_color_t *color,
cairo_xlib_surface_t *dst)
{
if (dst->base.is_clear || CAIRO_COLOR_IS_OPAQUE (color))
return op == CAIRO_OPERATOR_OVER || op == CAIRO_OPERATOR_ADD;
if (dst->base.is_clear || CAIRO_COLOR_IS_OPAQUE (color)) {
if (op == CAIRO_OPERATOR_OVER)
return TRUE;
if (op == CAIRO_OPERATOR_ADD)
return (dst->base.content & CAIRO_CONTENT_COLOR) == 0;
}
return FALSE;
}