DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
{
// FIXME: due to the way drag images are done on windows we need
// to preprocess the alpha channel <rdar://problem/5015946>
if (!image)
return 0;
CGContextRef targetContext;
CGContextRef srcContext;
CGImageRef srcImage;
IntSize srcSize = dragImageSize(image);
IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_cast<int>(srcSize.height() * scale.height()));
HBITMAP hbmp = 0;
HDC dc = GetDC(0);
HDC dstDC = CreateCompatibleDC(dc);
if (!dstDC)
goto exit;
hbmp = allocImage(dstDC, dstSize, &targetContext);
if (!hbmp)
goto exit;
srcContext = createCgContextFromBitmap(image);
srcImage = CGBitmapContextCreateImage(srcContext);
CGRect rect;
rect.origin.x = 0;
rect.origin.y = 0;
rect.size = dstSize;
CGContextDrawImage(targetContext, rect, srcImage);
CGImageRelease(srcImage);
CGContextRelease(srcContext);
CGContextRelease(targetContext);
::DeleteObject(image);
image = 0;
exit:
if (!hbmp)
hbmp = image;
if (dstDC)
DeleteDC(dstDC);
ReleaseDC(0, dc);
return hbmp;
}
DragImageRef scaleDragImage(DragImageRef imageRef, FloatSize scale)
{
// FIXME: due to the way drag images are done on windows we need
// to preprocess the alpha channel <rdar://problem/5015946>
if (!imageRef)
return 0;
GDIObject<HBITMAP> hbmp;
auto image = adoptGDIObject(imageRef);
IntSize srcSize = dragImageSize(image.get());
IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_cast<int>(srcSize.height() * scale.height()));
HWndDC dc(0);
auto dstDC = adoptGDIObject(::CreateCompatibleDC(dc));
if (!dstDC)
goto exit;
CGContextRef targetContext;
hbmp = allocImage(dstDC.get(), dstSize, &targetContext);
if (!hbmp)
goto exit;
CGContextRef srcContext = createCgContextFromBitmap(image.get());
CGImageRef srcImage = CGBitmapContextCreateImage(srcContext);
CGRect rect;
rect.origin.x = 0;
rect.origin.y = 0;
rect.size = dstSize;
CGContextDrawImage(targetContext, rect, srcImage);
CGImageRelease(srcImage);
CGContextRelease(srcContext);
CGContextRelease(targetContext);
exit:
if (!hbmp)
hbmp.swap(image);
return hbmp.leak();
}
