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robustiy has_alpha_channel()

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This commit is contained in:
David Rose 2003-04-12 18:40:58 +00:00
parent 28743b123b
commit 779f24c5f3
1 changed files with 32 additions and 2 deletions
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34
panda/src/egg/eggTexture.cxx
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@ -349,8 +349,38 @@ sorts_less_than(const EggTexture &other, int eq) const {
////////////////////////////////////////////////////////////////////
bool EggTexture::
has_alpha_channel(int num_components) const {
return (num_components == 2 || num_components == 4 ||
(num_components == 1 && _format == F_alpha));
switch (_format) {
case F_red:
case F_green:
case F_blue:
case F_luminance:
case F_rgb:
case F_rgb12:
case F_rgb8:
case F_rgb5:
case F_rgb332:
// These formats never use alpha, regardless of the number of
// components we have.
return false;
case F_alpha:
// This format always uses alpha.
return true;
case F_luminance_alpha:
case F_luminance_alphamask:
case F_rgba:
case F_rgbm:
case F_rgba12:
case F_rgba8:
case F_rgba4:
case F_rgba5:
case F_unspecified:
// These formats use alpha if the image had alpha.
return (num_components == 2 || num_components == 4);
}
return false;
}
////////////////////////////////////////////////////////////////////