diff options
| author | Owen Taylor <otaylor@redhat.com> | 2005-05-11 16:32:44 +0000 |
|---|---|---|
| committer | Owen Taylor <otaylor@redhat.com> | 2005-05-11 16:32:44 +0000 |
| commit | e4e5b1f00ded346f40c788fa9b6cfdd3164c1241 (patch) | |
| tree | c15f754f59b3b99f2bd1b326dedb610709941213 /src/cairo-win32-surface.c | |
| parent | b913a81c3482f4dc8bc452d91bfaf64b416523f3 (diff) | |
Handle more cases by assuming no-super-luminescent colors.
Diffstat (limited to 'src/cairo-win32-surface.c')
| -rw-r--r-- | src/cairo-win32-surface.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/cairo-win32-surface.c b/src/cairo-win32-surface.c index 7d544e49..9df86380 100644 --- a/src/cairo-win32-surface.c +++ b/src/cairo-win32-surface.c @@ -604,12 +604,15 @@ _cairo_win32_surface_composite (cairo_operator_t operator, /* This big function tells us how to optimize operators for the * case of solid destination and constant-alpha source + * + * NOTE: This function needs revisiting if we add support for + * super-luminescent colors (a == 0, r,g,b > 0) */ static enum { DO_CLEAR, DO_SOURCE, DO_NOTHING, DO_UNSUPPORTED } categorize_solid_dest_operator (cairo_operator_t operator, unsigned short alpha) { - enum { SOURCE_TRANSPARENT, SOURCE_SOLID, SOURCE_OTHER } source; + enum { SOURCE_TRANSPARENT, SOURCE_LIGHT, SOURCE_SOLID, SOURCE_OTHER } source; if (alpha >= 0xff00) source = SOURCE_SOLID; @@ -633,6 +636,8 @@ categorize_solid_dest_operator (cairo_operator_t operator, case CAIRO_OPERATOR_ATOP: /* Ab 1 - Aa */ if (source == SOURCE_SOLID) return DO_SOURCE; + else if (source == SOURCE_TRANSPARENT) + return DO_NOTHING; else return DO_UNSUPPORTED; break; @@ -664,7 +669,10 @@ categorize_solid_dest_operator (cairo_operator_t operator, break; case CAIRO_OPERATOR_ADD: /* 1 1 */ - return DO_UNSUPPORTED; + if (source == SOURCE_TRANSPARENT) + return DO_NOTHING; + else + return DO_UNSUPPORTED; break; } } |