1/* 2 * Copyright (C) 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 "GraphicsContext.h" 32#include "GraphicsContextPlatformPrivateCairo.h" 33#include "HWndDC.h" 34#include "Image.h" 35#include <cairo-win32.h> 36#include <windows.h> 37#include <wtf/RetainPtr.h> 38#include <wtf/win/GDIObject.h> 39 40namespace WebCore { 41 42void deallocContext(PlatformContextCairo* target) 43{ 44 delete target; 45} 46 47GDIObject<HBITMAP> allocImage(HDC dc, IntSize size, PlatformContextCairo** targetRef) 48{ 49 BitmapInfo bmpInfo = BitmapInfo::create(size); 50 51 LPVOID bits; 52 auto hbmp = adoptGDIObject(::CreateDIBSection(dc, &bmpInfo, DIB_RGB_COLORS, &bits, 0, 0)); 53 54 // At this point, we have a Cairo surface that points to a Windows DIB. The DIB interprets 55 // with the opposite meaning of positive Y axis, so everything we draw into this cairo 56 // context is going to be upside down. 57 if (!targetRef) 58 return hbmp; 59 60 cairo_surface_t* bitmapContext = cairo_image_surface_create_for_data((unsigned char*)bits, 61 CAIRO_FORMAT_ARGB32, 62 bmpInfo.bmiHeader.biWidth, 63 bmpInfo.bmiHeader.biHeight, 64 bmpInfo.bmiHeader.biWidth * 4); 65 66 if (!bitmapContext) 67 return GDIObject<HBITMAP>(); 68 69 cairo_t* cr = cairo_create(bitmapContext); 70 cairo_surface_destroy(bitmapContext); 71 72 // At this point, we have a Cairo surface that points to a Windows DIB. The DIB interprets 73 // with the opposite meaning of positive Y axis, so everything we draw into this cairo 74 // context is going to be upside down. 75 // 76 // So, we must invert the CTM for the context so that drawing commands will be flipped 77 // before they get written to the internal buffer. 78 cairo_matrix_t matrix; 79 cairo_matrix_init(&matrix, 1.0, 0.0, 0.0, -1.0, 0.0, size.height()); 80 cairo_set_matrix(cr, &matrix); 81 82 *targetRef = new PlatformGraphicsContext(cr); 83 cairo_destroy(cr); 84 85 return hbmp; 86} 87 88static cairo_surface_t* createCairoContextFromBitmap(HBITMAP bitmap) 89{ 90 BITMAP info; 91 GetObject(bitmap, sizeof(info), &info); 92 ASSERT(info.bmBitsPixel == 32); 93 94 // At this point, we have a Cairo surface that points to a Windows BITMAP. The BITMAP 95 // has the opposite meaning of positive Y axis, so everything we draw into this cairo 96 // context is going to be upside down. 97 return cairo_image_surface_create_for_data((unsigned char*)info.bmBits, 98 CAIRO_FORMAT_ARGB32, 99 info.bmWidth, 100 info.bmHeight, 101 info.bmWidthBytes); 102} 103 104DragImageRef scaleDragImage(DragImageRef imageRef, FloatSize scale) 105{ 106 // FIXME: due to the way drag images are done on windows we need 107 // to preprocess the alpha channel <rdar://problem/5015946> 108 if (!imageRef) 109 return 0; 110 111 GDIObject<HBITMAP> hbmp; 112 auto image = adoptGDIObject(imageRef); 113 114 IntSize srcSize = dragImageSize(image.get()); 115 IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_cast<int>(srcSize.height() * scale.height())); 116 117 HWndDC dc(0); 118 auto dstDC = adoptGDIObject(::CreateCompatibleDC(dc)); 119 if (!dstDC) 120 goto exit; 121 122 PlatformContextCairo* targetContext; 123 hbmp = allocImage(dstDC.get(), dstSize, &targetContext); 124 if (!hbmp) 125 goto exit; 126 127 cairo_surface_t* srcImage = createCairoContextFromBitmap(image.get()); 128 129 // Scale the target surface to the new image size, and flip it 130 // so that when we set the srcImage as the surface it will draw 131 // right-side-up. 132 cairo_t* cr = targetContext->cr(); 133 cairo_translate(cr, 0, dstSize.height()); 134 cairo_scale(cr, scale.width(), -scale.height()); 135 cairo_set_source_surface(cr, srcImage, 0.0, 0.0); 136 137 // Now we can paint and get the correct result 138 cairo_paint(cr); 139 140 cairo_surface_destroy(srcImage); 141 deallocContext(targetContext); 142 143exit: 144 if (!hbmp) 145 hbmp.swap(image); 146 return hbmp.leak(); 147} 148 149DragImageRef createDragImageFromImage(Image* img, ImageOrientationDescription) 150{ 151 HWndDC dc(0); 152 auto workingDC = adoptGDIObject(::CreateCompatibleDC(dc)); 153 if (!workingDC) 154 return 0; 155 156 PlatformContextCairo* drawContext = 0; 157 auto hbmp = allocImage(workingDC.get(), IntSize(img->size()), &drawContext); 158 if (!hbmp || !drawContext) 159 return 0; 160 161 cairo_t* cr = drawContext->cr(); 162 cairo_set_source_rgb(cr, 1.0, 0.0, 1.0); 163 cairo_fill_preserve(cr); 164 165 RefPtr<cairo_surface_t> surface = img->nativeImageForCurrentFrame(); 166 if (surface) { 167 // Draw the image. 168 cairo_set_source_surface(cr, surface.get(), 0.0, 0.0); 169 cairo_paint(cr); 170 } 171 172 deallocContext(drawContext); 173 174 return hbmp.leak(); 175} 176 177} 178