152 lines
4.9 KiB
C++
152 lines
4.9 KiB
C++
/*
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* Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "DragImage.h"
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#if USE(CG)
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#include "BitmapInfo.h"
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#include "CachedImage.h"
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#include "GraphicsContextCG.h"
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#include "HWndDC.h"
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#include "Image.h"
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#include <CoreGraphics/CoreGraphics.h>
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#include <wtf/RetainPtr.h>
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#include <wtf/win/GDIObject.h>
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#include <windows.h>
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namespace WebCore {
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void deallocContext(CGContextRef target)
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{
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CGContextRelease(target);
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}
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GDIObject<HBITMAP> allocImage(HDC dc, IntSize size, CGContextRef *targetRef)
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{
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BitmapInfo bmpInfo = BitmapInfo::create(size);
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LPVOID bits = nullptr;
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auto hbmp = adoptGDIObject(::CreateDIBSection(dc, &bmpInfo, DIB_RGB_COLORS, &bits, 0, 0));
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if (!targetRef || !hbmp)
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return hbmp;
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auto bitmapContext = adoptCF(CGBitmapContextCreate(bits, bmpInfo.bmiHeader.biWidth, bmpInfo.bmiHeader.biHeight, 8, bmpInfo.bmiHeader.biWidth * 4, sRGBColorSpaceRef(), kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst));
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if (!bitmapContext)
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return GDIObject<HBITMAP>();
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*targetRef = bitmapContext.leakRef();
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return hbmp;
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}
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static RetainPtr<CGContextRef> createCgContextFromBitmap(HBITMAP bitmap)
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{
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BITMAP info;
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GetObject(bitmap, sizeof(info), &info);
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ASSERT(info.bmBitsPixel == 32);
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return adoptCF(CGBitmapContextCreate(info.bmBits, info.bmWidth, info.bmHeight, 8, info.bmWidthBytes, sRGBColorSpaceRef(), kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst));
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}
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DragImageRef scaleDragImage(DragImageRef imageRef, FloatSize scale)
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{
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// FIXME: due to the way drag images are done on windows we need
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// to preprocess the alpha channel <rdar://problem/5015946>
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if (!imageRef)
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return 0;
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GDIObject<HBITMAP> hbmp;
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auto image = adoptGDIObject(imageRef);
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auto returnHbmp = [&hbmp, &image] {
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if (!hbmp)
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hbmp.swap(image);
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return hbmp.leak();
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};
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IntSize srcSize = dragImageSize(image.get());
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IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_cast<int>(srcSize.height() * scale.height()));
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HWndDC dc(0);
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auto dstDC = adoptGDIObject(::CreateCompatibleDC(dc));
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if (!dstDC)
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return returnHbmp();
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CGContextRef targetContext;
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hbmp = allocImage(dstDC.get(), dstSize, &targetContext);
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if (!hbmp)
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return returnHbmp();
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auto srcContext = createCgContextFromBitmap(image.get());
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auto srcImage = adoptCF(CGBitmapContextCreateImage(srcContext.get()));
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CGRect rect;
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rect.origin.x = 0;
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rect.origin.y = 0;
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rect.size = dstSize;
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CGContextDrawImage(targetContext, rect, srcImage.get());
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CGContextRelease(targetContext);
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return returnHbmp();
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}
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DragImageRef createDragImageFromImage(Image* img, ImageOrientation)
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{
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HWndDC dc(0);
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auto workingDC = adoptGDIObject(::CreateCompatibleDC(dc));
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if (!workingDC)
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return 0;
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CGContextRef drawContext = 0;
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auto hbmp = allocImage(workingDC.get(), IntSize(img->size()), &drawContext);
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if (!hbmp || !drawContext)
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return 0;
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CGRect rect;
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rect.size = IntSize(img->size());
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rect.origin.x = 0;
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rect.origin.y = -rect.size.height;
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static const CGFloat white [] = {1.0, 1.0, 1.0, 1.0};
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CGContextScaleCTM(drawContext, 1, -1);
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CGContextSetFillColor(drawContext, white);
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CGContextFillRect(drawContext, rect);
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if (auto srcImage = img->nativeImage()) {
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if (auto platformImage = srcImage->platformImage()) {
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CGContextSetBlendMode(drawContext, kCGBlendModeNormal);
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CGContextDrawImage(drawContext, rect, platformImage.get());
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}
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}
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CGContextRelease(drawContext);
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return hbmp.leak();
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}
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}
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#endif
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