1/* 2 * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "DragImage.h" 28 29#include "BitmapInfo.h" 30#include "CachedImage.h" 31#include "GraphicsContextCG.h" 32#include "HWndDC.h" 33#include "Image.h" 34 35#include <CoreGraphics/CoreGraphics.h> 36#include <wtf/RetainPtr.h> 37#include <wtf/win/GDIObject.h> 38 39#include <windows.h> 40 41namespace WebCore { 42 43void deallocContext(CGContextRef target) 44{ 45 CGContextRelease(target); 46} 47 48GDIObject<HBITMAP> allocImage(HDC dc, IntSize size, CGContextRef *targetRef) 49{ 50 BitmapInfo bmpInfo = BitmapInfo::create(size); 51 52 LPVOID bits; 53 auto hbmp = adoptGDIObject(::CreateDIBSection(dc, &bmpInfo, DIB_RGB_COLORS, &bits, 0, 0)); 54 55 if (!targetRef) 56 return hbmp; 57 58 CGContextRef bitmapContext = CGBitmapContextCreate(bits, bmpInfo.bmiHeader.biWidth, bmpInfo.bmiHeader.biHeight, 8, 59 bmpInfo.bmiHeader.biWidth * 4, deviceRGBColorSpaceRef(), 60 kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst); 61 if (!bitmapContext) 62 return GDIObject<HBITMAP>(); 63 64 *targetRef = bitmapContext; 65 return hbmp; 66} 67 68static CGContextRef createCgContextFromBitmap(HBITMAP bitmap) 69{ 70 BITMAP info; 71 GetObject(bitmap, sizeof(info), &info); 72 ASSERT(info.bmBitsPixel == 32); 73 74 CGContextRef bitmapContext = CGBitmapContextCreate(info.bmBits, info.bmWidth, info.bmHeight, 8, 75 info.bmWidthBytes, deviceRGBColorSpaceRef(), kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst); 76 return bitmapContext; 77} 78 79DragImageRef scaleDragImage(DragImageRef imageRef, FloatSize scale) 80{ 81 // FIXME: due to the way drag images are done on windows we need 82 // to preprocess the alpha channel <rdar://problem/5015946> 83 if (!imageRef) 84 return 0; 85 86 GDIObject<HBITMAP> hbmp; 87 auto image = adoptGDIObject(imageRef); 88 89 IntSize srcSize = dragImageSize(image.get()); 90 IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_cast<int>(srcSize.height() * scale.height())); 91 92 HWndDC dc(0); 93 auto dstDC = adoptGDIObject(::CreateCompatibleDC(dc)); 94 if (!dstDC) 95 goto exit; 96 97 CGContextRef targetContext; 98 hbmp = allocImage(dstDC.get(), dstSize, &targetContext); 99 if (!hbmp) 100 goto exit; 101 102 CGContextRef srcContext = createCgContextFromBitmap(image.get()); 103 CGImageRef srcImage = CGBitmapContextCreateImage(srcContext); 104 CGRect rect; 105 rect.origin.x = 0; 106 rect.origin.y = 0; 107 rect.size = dstSize; 108 CGContextDrawImage(targetContext, rect, srcImage); 109 CGImageRelease(srcImage); 110 CGContextRelease(srcContext); 111 CGContextRelease(targetContext); 112 113exit: 114 if (!hbmp) 115 hbmp.swap(image); 116 return hbmp.leak(); 117} 118 119DragImageRef createDragImageFromImage(Image* img, ImageOrientationDescription) 120{ 121 HWndDC dc(0); 122 auto workingDC = adoptGDIObject(::CreateCompatibleDC(dc)); 123 if (!workingDC) 124 return 0; 125 126 CGContextRef drawContext = 0; 127 auto hbmp = allocImage(workingDC.get(), IntSize(img->size()), &drawContext); 128 if (!hbmp || !drawContext) 129 return 0; 130 131 CGImageRef srcImage = img->getCGImageRef(); 132 CGRect rect; 133 rect.size = IntSize(img->size()); 134 rect.origin.x = 0; 135 rect.origin.y = -rect.size.height; 136 static const CGFloat white [] = {1.0, 1.0, 1.0, 1.0}; 137 CGContextScaleCTM(drawContext, 1, -1); 138 CGContextSetFillColor(drawContext, white); 139 CGContextFillRect(drawContext, rect); 140 if (srcImage) { 141 CGContextSetBlendMode(drawContext, kCGBlendModeNormal); 142 CGContextDrawImage(drawContext, rect, srcImage); 143 } 144 CGContextRelease(drawContext); 145 146 return hbmp.leak(); 147} 148 149} 150