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      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 
     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 
     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 
    114 void GraphicsContext3D::setContextLostCallback(PassOwnPtr<ContextLostCallback>)
    115 {
    116 }
    117 
    118 } // namespace WebCore
    119 
    120 #endif // ENABLE(WEBGL)
    121