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Handle more cases by assuming no-super-luminescent colors.

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This commit is contained in:
Owen Taylor 2005-05-11 16:32:44 +00:00
parent b913a81c34
commit e4e5b1f00d
2 changed files with 15 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2005-05-11 Owen Taylor <otaylor@redhat.com>
* src/cairo-win32-surface.c (categorize_solid_dest_operator):
Handle more cases by assuming no-super-luminescent colors.
2005-05-11 T Rowley <tim.rowley@gmail.com>
* src/cairo-atsui-font.c:

12
src/cairo-win32-surface.c
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@ -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;
}
}