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Try to simply alpha handling in wxCairoBitmapData a bit more

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Don't use hasAlpha under platforms where it's always true.
This commit is contained in:
Vadim Zeitlin
2019-11-10 17:51:55 +01:00
parent c81021e850
commit d6d5375fe9
1 changed files with 9 additions and 9 deletions
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18
src/generic/graphicc.cpp
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@@ -1491,10 +1491,15 @@ wxCairoBitmapData::wxCairoBitmapData( wxGraphicsRenderer* renderer, const wxBitm
// different format and iterator than if it doesn't...
const bool isSrcBpp32 = bmp.GetDepth() == 32;
#if defined(__WXMSW__) || defined(__WXOSX__)
// Under MSW and OSX we can have 32 bpp xRGB bitmaps (without alpha).
const bool hasAlpha = bmpSource.HasAlpha();
#endif
cairo_format_t bufferFormat =
// Under MSW and OSX we can have 32 bpp xRGB bitmaps (without alpha).
#if defined(__WXMSW__) || defined(__WXOSX__)
(isSrcBpp32 && bmp.HasAlpha()) || bmp.GetMask() != NULL
(isSrcBpp32 && hasAlpha) || bmp.GetMask() != NULL
#else
isSrcBpp32 || bmp.GetMask() != NULL
#endif
@@ -1507,13 +1512,6 @@ wxCairoBitmapData::wxCairoBitmapData( wxGraphicsRenderer* renderer, const wxBitm
if ( isSrcBpp32 )
{
#if defined(__WXMSW__) || defined(__WXOSX__)
// Under MSW and OSX we can have 32 bpp xRGB bitmaps (without alpha).
const bool hasAlpha = bmpSource.HasAlpha();
#else
const bool hasAlpha = true;
#endif
{
// use the bitmap's alpha
wxAlphaPixelData pixData(bmpSource);
@@ -1530,11 +1528,13 @@ wxCairoBitmapData::wxCairoBitmapData( wxGraphicsRenderer* renderer, const wxBitm
// with alpha in the upper 8 bits, then red, then green, then
// blue. The 32-bit quantities are stored native-endian.
// Pre-multiplied alpha is used.
unsigned char alpha = hasAlpha ? p.Alpha() : 255;
#if defined (__WXMSW__) || defined(__WXOSX__)
unsigned char alpha = hasAlpha ? p.Alpha() : 255;
// MSW and OSX bitmap pixel bits are already premultiplied.
*data = (alpha << 24 | p.Red() << 16 | p.Green() << 8 | p.Blue());
#else // !__WXMSW__ , !__WXOSX__
// We always have alpha, but we need to premultiply it.
unsigned char alpha = p.Alpha();
if (alpha == 0)
*data = 0;
else