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Don't premultiply pixels from wxBitmapBundle::FromSVG() on wxGTK.

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See #24064.
This commit is contained in:
Tim Eliseo 2023-11-21 19:45:57 -08:00
parent 8ea22b5e92
commit 17c34d41ba
1 changed files with 15 additions and 1 deletions
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16
src/generic/bmpsvg.cpp
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@ -189,11 +189,25 @@ wxBitmap wxBitmapBundleImplSVG::DoRasterize(const wxSize& size)
for ( int x = 0; x < size.x; ++x )
{
const unsigned char a = src[3];
#if defined (__WXMSW__) || defined(__WXOSX__) || defined(__WXQT__)
// MSW, OSX, and Qt bitmaps require premultiplication by alpha.
dst.Red() = src[0] * a / 255;
dst.Green() = src[1] * a / 255;
dst.Blue() = src[2] * a / 255;
dst.Alpha() = a;
#else
// Other platforms (esp. GTK) store bitmaps with straight alpha.
dst.Alpha() = a;
if ( a )
{
dst.Red() = src[0];
dst.Green() = src[1];
dst.Blue() = src[2];
}
else
// A more canonical form for completely transparent pixels
dst.Red() = dst.Green() = dst.Blue() = 0;
#endif
++dst;
src += 4;
}