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[image] Treat A1 image surfaces as BILEVEL_ALPHA

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Categorise the transparency of FORMAT_A1 image surfaces as BILEVEL_ALPHA.
This commit is contained in:
Chris Wilson 2009-05-05 17:11:55 +01:00
parent aac132a76a
commit 1d609d6722
1 changed files with 7 additions and 2 deletions
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9
src/cairo-image-surface.c
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@ -1578,8 +1578,13 @@ _cairo_image_analyze_transparency (cairo_image_surface_t *image)
if ((image->base.content & CAIRO_CONTENT_ALPHA) == 0)
return image->transparency = CAIRO_IMAGE_IS_OPAQUE;
if ((image->base.content & CAIRO_CONTENT_COLOR) == 0)
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
if ((image->base.content & CAIRO_CONTENT_COLOR) == 0) {
if (image->format == CAIRO_FORMAT_A1)
return image->transparency = CAIRO_IMAGE_HAS_BILEVEL_ALPHA;
else
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
}
if (image->format != CAIRO_FORMAT_ARGB32)
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;