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
deallocContext(CGContextRef target)41 void deallocContext(CGContextRef target)
42 {
43 CGContextRelease(target);
44 }
45
allocImage(HDC dc,IntSize size,CGContextRef * targetRef)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
createCgContextFromBitmap(HBITMAP bitmap)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
scaleDragImage(DragImageRef image,FloatSize scale)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
createDragImageFromImage(Image * img)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