diff options
Diffstat (limited to 'src/cairo-gstate.c')
| -rw-r--r-- | src/cairo-gstate.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/src/cairo-gstate.c b/src/cairo-gstate.c index 5a8664a0..caed88b5 100644 --- a/src/cairo-gstate.c +++ b/src/cairo-gstate.c @@ -993,8 +993,21 @@ _reduce_op (cairo_gstate_t *gstate) const cairo_pattern_t *pattern; op = gstate->op; - if (op != CAIRO_OPERATOR_SOURCE) + if (op == CAIRO_OPERATOR_IN && + gstate->target->is_clear && + gstate->target->content & CAIRO_CONTENT_ALPHA) + { + return CAIRO_OPERATOR_CLEAR; + } + + if (op != CAIRO_OPERATOR_SOURCE && + ! (gstate->target->is_clear && + (op == CAIRO_OPERATOR_OVER || + (op == CAIRO_OPERATOR_ADD && + gstate->target->content & CAIRO_CONTENT_ALPHA)))) + { return op; + } pattern = gstate->source; if (pattern->type == CAIRO_PATTERN_TYPE_SOLID) { |