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cogl-texture: Avoid premult conversion if the dst format has no alpha

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The _cogl_texture_needs_premult_conversion function was already
checking whether the source format had an alpha channel before
returning TRUE, but it also doesn't make sense to do the premult
conversion if the destination format has no alpha. This patch adds
that check in too.
This commit is contained in:
Neil Roberts 2010-06-01 13:32:57 +01:00
parent 279ad7b7e5
commit 3abe26b913
1 changed files with 2 additions and 1 deletions
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3
clutter/cogl/cogl/cogl-texture.c
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@ -125,8 +125,9 @@ static gboolean
_cogl_texture_needs_premult_conversion (CoglPixelFormat src_format,
CoglPixelFormat dst_format)
{
return ((src_format & COGL_A_BIT) &&
return ((src_format & dst_format & COGL_A_BIT) &&
src_format != COGL_PIXEL_FORMAT_A_8 &&
dst_format != COGL_PIXEL_FORMAT_A_8 &&
(src_format & COGL_PREMULT_BIT) !=
(dst_format & COGL_PREMULT_BIT));
}