1 /*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 * Copyright (C) 2010 Google Inc. All rights reserved.
4 * Copyright (C) 2011 Igalia S.L.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "config.h"
29 #include "GraphicsContext3D.h"
30 #include "PlatformContextCairo.h"
31
32 #if ENABLE(WEBGL)
33
34 #include "Image.h"
35 #include "RefPtrCairo.h"
36 #include <cairo.h>
37 #include <wtf/PassOwnPtr.h>
38
39 namespace WebCore {
40
getImageData(Image * image,unsigned int format,unsigned int type,bool premultiplyAlpha,bool ignoreGammaAndColorProfile,Vector<uint8_t> & outputVector)41 bool GraphicsContext3D::getImageData(Image* image, unsigned int format, unsigned int type, bool premultiplyAlpha, bool ignoreGammaAndColorProfile, Vector<uint8_t>& outputVector)
42 {
43 if (!image)
44 return false;
45 // We need this to stay in scope because the native image is just a shallow copy of the data.
46 ImageSource decoder(premultiplyAlpha ? ImageSource::AlphaPremultiplied : ImageSource::AlphaNotPremultiplied,
47 ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied);
48 AlphaOp alphaOp = AlphaDoNothing;
49 RefPtr<cairo_surface_t> imageSurface;
50 if (image->data()) {
51 decoder.setData(image->data(), true);
52 if (!decoder.frameCount() || !decoder.frameIsCompleteAtIndex(0))
53 return false;
54 imageSurface = decoder.createFrameAtIndex(0);
55 } else {
56 imageSurface = image->nativeImageForCurrentFrame();
57 if (!premultiplyAlpha)
58 alphaOp = AlphaDoUnmultiply;
59 }
60
61 if (!imageSurface)
62 return false;
63
64 int width = cairo_image_surface_get_width(imageSurface.get());
65 int height = cairo_image_surface_get_height(imageSurface.get());
66 if (!width || !height)
67 return false;
68
69 if (cairo_image_surface_get_format(imageSurface.get()) != CAIRO_FORMAT_ARGB32)
70 return false;
71
72 unsigned int srcUnpackAlignment = 1;
73 size_t bytesPerRow = cairo_image_surface_get_stride(imageSurface.get());
74 size_t bitsPerPixel = 32;
75 unsigned int padding = bytesPerRow - bitsPerPixel / 8 * width;
76 if (padding) {
77 srcUnpackAlignment = padding + 1;
78 while (bytesPerRow % srcUnpackAlignment)
79 ++srcUnpackAlignment;
80 }
81
82 outputVector.resize(width * height * 4);
83 return packPixels(cairo_image_surface_get_data(imageSurface.get()), SourceFormatBGRA8,
84 width, height, srcUnpackAlignment, format, type, alphaOp, outputVector.data());
85 }
86
paintToCanvas(const unsigned char * imagePixels,int imageWidth,int imageHeight,int canvasWidth,int canvasHeight,PlatformContextCairo * context)87 void GraphicsContext3D::paintToCanvas(const unsigned char* imagePixels, int imageWidth, int imageHeight, int canvasWidth, int canvasHeight, PlatformContextCairo* context)
88 {
89 if (!imagePixels || imageWidth <= 0 || imageHeight <= 0 || canvasWidth <= 0 || canvasHeight <= 0 || !context)
90 return;
91
92 cairo_t *cr = context->cr();
93 context->save();
94
95 cairo_rectangle(cr, 0, 0, canvasWidth, canvasHeight);
96 cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
97 cairo_paint(cr);
98
99 RefPtr<cairo_surface_t> imageSurface = adoptRef(cairo_image_surface_create_for_data(
100 const_cast<unsigned char*>(imagePixels), CAIRO_FORMAT_ARGB32, imageWidth, imageHeight, imageWidth * 4));
101
102 // OpenGL keeps the pixels stored bottom up, so we need to flip the image here.
103 cairo_translate(cr, 0, imageHeight);
104 cairo_scale(cr, 1, -1);
105
106 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
107 cairo_set_source_surface(cr, imageSurface.get(), 0, 0);
108 cairo_rectangle(cr, 0, 0, canvasWidth, -canvasHeight);
109
110 cairo_fill(cr);
111 context->restore();
112 }
113
setContextLostCallback(PassOwnPtr<ContextLostCallback>)114 void GraphicsContext3D::setContextLostCallback(PassOwnPtr<ContextLostCallback>)
115 {
116 }
117
118 } // namespace WebCore
119
120 #endif // ENABLE(WEBGL)
121