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Add wxHAS_PREMULTIPLIED_ALPHA to abstract if wxBitmap pixels are premultiplied.

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All previous relevant platform-specific tests have been changed to use this
symbol. Also, samples/image now premultiplies conditionally, correcting a
visual anomaly on wxGTK.
This commit is contained in:
Tim Eliseo 2023-11-23 18:42:32 -08:00
parent 17c34d41ba
commit fce4941404
7 changed files with 86 additions and 42 deletions
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4
tests/graphics/graphbitmap.cpp
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@ -101,12 +101,12 @@ wxBitmap CreateBitmapRGBA(int w, int h, bool withMask)
const wxColour clrBg(*wxGREEN);
const unsigned char alpha = 51;
#if defined(__WXMSW__) || defined(__WXOSX__) || defined(__WXQT__)
#ifdef wxHAS_PREMULTIPLIED_ALPHA
// premultiplied values
const wxColour clrFgAlpha(((clrFg.Red() * alpha) + 127) / 255, ((clrFg.Green() * alpha) + 127) / 255, ((clrFg.Blue() * alpha) + 127) / 255);
#else
const wxColour clrFgAlpha(clrFg);
#endif // __WXMSW__ || __WXOSX__ || __WXQT__
#endif // wxHAS_PREMULTIPLIED_ALPHA
wxAlphaPixelData data(bmp);
REQUIRE(data);