1 /* 2 * Copyright (C) 2007, 2008 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 COMPUTER, 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 COMPUTER, 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 "Image.h" 33 #include "RetainPtr.h" 34 35 #include <CoreGraphics/CoreGraphics.h> 36 37 #include <windows.h> 38 39 namespace WebCore { 40 41 void deallocContext(CGContextRef target) 42 { 43 CGContextRelease(target); 44 } 45 46 HBITMAP allocImage(HDC dc, IntSize size, CGContextRef *targetRef) 47 { 48 BitmapInfo bmpInfo = BitmapInfo::create(size); 49 50 LPVOID bits; 51 HBITMAP hbmp = CreateDIBSection(dc, &bmpInfo, DIB_RGB_COLORS, &bits, 0, 0); 52 53 if (!targetRef) 54 return hbmp; 55 56 CGContextRef bitmapContext = CGBitmapContextCreate(bits, bmpInfo.bmiHeader.biWidth, bmpInfo.bmiHeader.biHeight, 8, 57 bmpInfo.bmiHeader.biWidth * 4, deviceRGBColorSpaceRef(), 58 kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst); 59 if (!bitmapContext) { 60 DeleteObject(hbmp); 61 return 0; 62 } 63 64 *targetRef = bitmapContext; 65 return hbmp; 66 } 67 68 static 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 79 DragImageRef scaleDragImage(DragImageRef image, 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 84 if (!image) 85 return 0; 86 CGContextRef targetContext; 87 CGContextRef srcContext; 88 CGImageRef srcImage; 89 IntSize srcSize = dragImageSize(image); 90 IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_cast<int>(srcSize.height() * scale.height())); 91 HBITMAP hbmp = 0; 92 HDC dc = GetDC(0); 93 HDC dstDC = CreateCompatibleDC(dc); 94 if (!dstDC) 95 goto exit; 96 97 hbmp = allocImage(dstDC, dstSize, &targetContext); 98 if (!hbmp) 99 goto exit; 100 101 srcContext = createCgContextFromBitmap(image); 102 srcImage = CGBitmapContextCreateImage(srcContext); 103 CGRect rect; 104 rect.origin.x = 0; 105 rect.origin.y = 0; 106 rect.size = dstSize; 107 CGContextDrawImage(targetContext, rect, srcImage); 108 CGImageRelease(srcImage); 109 CGContextRelease(srcContext); 110 CGContextRelease(targetContext); 111 ::DeleteObject(image); 112 image = 0; 113 114 exit: 115 if (!hbmp) 116 hbmp = image; 117 if (dstDC) 118 DeleteDC(dstDC); 119 ReleaseDC(0, dc); 120 return hbmp; 121 } 122 123 DragImageRef createDragImageFromImage(Image* img) 124 { 125 HBITMAP hbmp = 0; 126 HDC dc = GetDC(0); 127 HDC workingDC = CreateCompatibleDC(dc); 128 CGContextRef drawContext = 0; 129 if (!workingDC) 130 goto exit; 131 132 hbmp = allocImage(workingDC, img->size(), &drawContext); 133 134 if (!hbmp) 135 goto exit; 136 137 if (!drawContext) { 138 ::DeleteObject(hbmp); 139 hbmp = 0; 140 } 141 142 CGImageRef srcImage = img->getCGImageRef(); 143 CGRect rect; 144 rect.size = img->size(); 145 rect.origin.x = 0; 146 rect.origin.y = -rect.size.height; 147 static const CGFloat white [] = {1.0, 1.0, 1.0, 1.0}; 148 CGContextScaleCTM(drawContext, 1, -1); 149 CGContextSetFillColor(drawContext, white); 150 CGContextFillRect(drawContext, rect); 151 CGContextSetBlendMode(drawContext, kCGBlendModeNormal); 152 CGContextDrawImage(drawContext, rect, srcImage); 153 CGContextRelease(drawContext); 154 155 exit: 156 if (workingDC) 157 DeleteDC(workingDC); 158 ReleaseDC(0, dc); 159 return hbmp; 160 } 161 162 } 163