2 * Copyright (C) 2007 Apple, Inc. All rights reserved.
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5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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14 * its contributors may be used to endorse or promote products derived
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32 #include "PixelDumpSupportCG.h"
34 #include "PixelDumpSupportCairo.h"
37 #include "DumpRenderTree.h"
40 // Note: Must be included *after* DumpRenderTree.h to avoid compile error.
41 #include <CoreGraphics/CGBitmapContext.h>
44 #include <wtf/Assertions.h>
45 #include <wtf/RetainPtr.h>
47 static void makeAlphaChannelOpaque(void* argbBits, LONG width, LONG height)
49 unsigned* pixel = static_cast<unsigned*>(argbBits);
50 for (LONG row = 0; row < height; ++row) {
51 for (LONG column = 0; column < width; ++column)
52 *pixel++ |= 0xff000000;
56 PassRefPtr<BitmapContext> createBitmapContextFromWebView(bool onscreen, bool incrementalRepaint, bool sweepHorizontally, bool drawSelectionRect)
59 if (!GetWindowRect(webViewWindow, &frame))
63 bmp.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
64 bmp.bmiHeader.biWidth = frame.right - frame.left;
65 bmp.bmiHeader.biHeight = -(frame.bottom - frame.top);
66 bmp.bmiHeader.biPlanes = 1;
67 bmp.bmiHeader.biBitCount = 32;
68 bmp.bmiHeader.biCompression = BI_RGB;
71 HBITMAP bitmap = CreateDIBSection(0, &bmp, DIB_RGB_COLORS, &bits, 0, 0);
73 HDC memoryDC = CreateCompatibleDC(0);
74 SelectObject(memoryDC, bitmap);
75 SendMessage(webViewWindow, WM_PRINT, reinterpret_cast<WPARAM>(memoryDC), PRF_CLIENT | PRF_CHILDREN | PRF_OWNED);
79 GetObject(bitmap, sizeof(info), &info);
80 ASSERT(info.bmBitsPixel == 32);
82 // We create a context that has an alpha channel below so that the PNGs we generate will also
83 // have an alpha channel. But WM_PRINT doesn't necessarily write anything into the alpha
84 // channel, so we set the alpha channel to constant full opacity to make sure the resulting image is opaque.
85 makeAlphaChannelOpaque(info.bmBits, info.bmWidth, info.bmHeight);
88 RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
89 CGContextRef context = CGBitmapContextCreate(info.bmBits, info.bmWidth, info.bmHeight, 8,
90 info.bmWidthBytes, colorSpace.get(), kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst);
92 cairo_surface_t* image = cairo_image_surface_create_for_data((unsigned char*)info.bmBits, CAIRO_FORMAT_ARGB32,
93 info.bmWidth, info.bmHeight, info.bmWidthBytes);
94 cairo_t* context = cairo_create(image);
95 cairo_surface_destroy(image);
98 return BitmapContext::createByAdoptingBitmapAndContext(bitmap, context);