Surface8u convertGdiplusBitmap( Gdiplus::Bitmap &bitmap )
{
Gdiplus::BitmapData bitmapData;
Gdiplus::Rect rect( 0, 0, bitmap.GetWidth(), bitmap.GetHeight() );
Gdiplus::PixelFormat requestedFormat = bitmap.GetPixelFormat();
SurfaceChannelOrder sco;
bool premult;
gdiplusPixelFormatToSurfaceChannelOrder( requestedFormat, &sco, &premult );
if( sco == SurfaceChannelOrder::UNSPECIFIED ) {
UINT flags = bitmap.GetFlags();
sco = ( flags & Gdiplus::ImageFlagsHasAlpha ) ? SurfaceChannelOrder::BGRA : SurfaceChannelOrder::BGR;
requestedFormat = ( flags & Gdiplus::ImageFlagsHasAlpha ) ? PixelFormat32bppARGB : PixelFormat24bppRGB;
}
bitmap.LockBits( &rect, Gdiplus::ImageLockModeRead, requestedFormat, &bitmapData );
Surface8u result( bitmap.GetWidth(), bitmap.GetHeight(), sco.hasAlpha(), sco );
const uint8_t *srcDataBase = (uint8_t*)bitmapData.Scan0;
int32_t width = bitmap.GetWidth();
for( uint32_t y = 0; y < bitmap.GetHeight(); ++y ) {
memcpy( result.getData( Vec2i( 0, y ) ), srcDataBase + y * bitmapData.Stride, width * result.getPixelInc() );
}
bitmap.UnlockBits( &bitmapData );
return result;
}
int32_t SurfaceConstraintsCairo::getRowBytes( int requestedWidth, const SurfaceChannelOrder &sco, int elementSize ) const {
return cairo_format_stride_for_width( sco.hasAlpha() ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24, requestedWidth );
}