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| 1 /* | |
| 2 * Copyright (C) 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 "GraphicsContext.h" | |
| 32 #include "GraphicsContextPlatformPrivateCairo.h" | |
| 33 #include "Image.h" | |
| 34 #include "NativeImageCairo.h" | |
| 35 #include <wtf/RetainPtr.h> | |
| 36 #include <cairo-win32.h> | |
| 37 #include <windows.h> | |
| 38 | |
| 39 namespace WebCore { | |
| 40 | |
| 41 void deallocContext(PlatformContextCairo* target) | |
| 42 { | |
| 43 delete target; | |
| 44 } | |
| 45 | |
| 46 HBITMAP allocImage(HDC dc, IntSize size, PlatformContextCairo** 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 // At this point, we have a Cairo surface that points to a Windows DIB. The
DIB interprets | |
| 54 // with the opposite meaning of positive Y axis, so everything we draw into
this cairo | |
| 55 // context is going to be upside down. | |
| 56 if (!targetRef) | |
| 57 return hbmp; | |
| 58 | |
| 59 cairo_surface_t* bitmapContext = cairo_image_surface_create_for_data((unsign
ed char*)bits, | |
| 60 CAIRO_FORMAT_ARGB32, | |
| 61 bmpInfo.bmiHeader.biWidth, | |
| 62 bmpInfo.bmiHeader.biHeight, | |
| 63 bmpInfo.bmiHeader.biWidth * 4); | |
| 64 | |
| 65 if (!bitmapContext) { | |
| 66 DeleteObject(hbmp); | |
| 67 return 0; | |
| 68 } | |
| 69 | |
| 70 cairo_t* cr = cairo_create(bitmapContext); | |
| 71 cairo_surface_destroy(bitmapContext); | |
| 72 | |
| 73 // At this point, we have a Cairo surface that points to a Windows DIB. The
DIB interprets | |
| 74 // with the opposite meaning of positive Y axis, so everything we draw into
this cairo | |
| 75 // context is going to be upside down. | |
| 76 // | |
| 77 // So, we must invert the CTM for the context so that drawing commands will
be flipped | |
| 78 // before they get written to the internal buffer. | |
| 79 cairo_matrix_t matrix; | |
| 80 cairo_matrix_init(&matrix, 1.0, 0.0, 0.0, -1.0, 0.0, size.height()); | |
| 81 cairo_set_matrix(cr, &matrix); | |
| 82 | |
| 83 *targetRef = new PlatformGraphicsContext(cr); | |
| 84 cairo_destroy(cr); | |
| 85 | |
| 86 return hbmp; | |
| 87 } | |
| 88 | |
| 89 static cairo_surface_t* createCairoContextFromBitmap(HBITMAP bitmap) | |
| 90 { | |
| 91 BITMAP info; | |
| 92 GetObject(bitmap, sizeof(info), &info); | |
| 93 ASSERT(info.bmBitsPixel == 32); | |
| 94 | |
| 95 // At this point, we have a Cairo surface that points to a Windows BITMAP.
The BITMAP | |
| 96 // has the opposite meaning of positive Y axis, so everything we draw into t
his cairo | |
| 97 // context is going to be upside down. | |
| 98 return cairo_image_surface_create_for_data((unsigned char*)info.bmBits, | |
| 99 CAIRO_FORMAT_ARGB32, | |
| 100 info.bmWidth, | |
| 101 info.bmHeight, | |
| 102 info.bmWidthBytes); | |
| 103 } | |
| 104 | |
| 105 DragImageRef scaleDragImage(DragImageRef image, FloatSize scale) | |
| 106 { | |
| 107 // FIXME: due to the way drag images are done on windows we need | |
| 108 // to preprocess the alpha channel <rdar://problem/5015946> | |
| 109 if (!image) | |
| 110 return 0; | |
| 111 | |
| 112 IntSize srcSize = dragImageSize(image); | |
| 113 IntSize dstSize(static_cast<int>(srcSize.width() * scale.width()), static_ca
st<int>(srcSize.height() * scale.height())); | |
| 114 | |
| 115 HBITMAP hbmp = 0; | |
| 116 HDC dc = GetDC(0); | |
| 117 HDC dstDC = CreateCompatibleDC(dc); | |
| 118 | |
| 119 if (!dstDC) | |
| 120 goto exit; | |
| 121 | |
| 122 PlatformContextCairo* targetContext; | |
| 123 hbmp = allocImage(dstDC, dstSize, &targetContext); | |
| 124 if (!hbmp) | |
| 125 goto exit; | |
| 126 | |
| 127 cairo_surface_t* srcImage = createCairoContextFromBitmap(image); | |
| 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 ::DeleteObject(image); | |
| 143 image = 0; | |
| 144 | |
| 145 exit: | |
| 146 if (!hbmp) | |
| 147 hbmp = image; | |
| 148 if (dstDC) | |
| 149 DeleteDC(dstDC); | |
| 150 ReleaseDC(0, dc); | |
| 151 return hbmp; | |
| 152 } | |
| 153 | |
| 154 DragImageRef createDragImageFromImage(Image* img, RespectImageOrientationEnum) | |
| 155 { | |
| 156 HBITMAP hbmp = 0; | |
| 157 HDC dc = GetDC(0); | |
| 158 HDC workingDC = CreateCompatibleDC(dc); | |
| 159 if (!workingDC) | |
| 160 goto exit; | |
| 161 | |
| 162 PlatformContextCairo* drawContext = 0; | |
| 163 hbmp = allocImage(workingDC, img->size(), &drawContext); | |
| 164 if (!hbmp) | |
| 165 goto exit; | |
| 166 | |
| 167 if (!drawContext) { | |
| 168 ::DeleteObject(hbmp); | |
| 169 hbmp = 0; | |
| 170 } | |
| 171 | |
| 172 cairo_t* cr = drawContext->cr(); | |
| 173 cairo_set_source_rgb(cr, 1.0, 0.0, 1.0); | |
| 174 cairo_fill_preserve(cr); | |
| 175 | |
| 176 NativeImageCairo* srcNativeImage = img->nativeImageForCurrentFrame(); | |
| 177 cairo_surface_t* srcImage = (srcNativeImage) ? srcNativeImage->surface() : 0
; | |
| 178 | |
| 179 if (srcImage) { | |
| 180 // Draw the image. | |
| 181 cairo_set_source_surface(cr, srcImage, 0.0, 0.0); | |
| 182 cairo_paint(cr); | |
| 183 } | |
| 184 | |
| 185 deallocContext(drawContext); | |
| 186 | |
| 187 exit: | |
| 188 if (workingDC) | |
| 189 DeleteDC(workingDC); | |
| 190 ReleaseDC(0, dc); | |
| 191 return hbmp; | |
| 192 } | |
| 193 | |
| 194 } | |
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