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      1 /*
      2  * Copyright (C) 2011 Google 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  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 
     28 #include "PlatformImage.h"
     29 
     30 #if USE(SKIA)
     31 #include "NativeImageSkia.h"
     32 #include "PlatformContextSkia.h"
     33 #elif USE(CG)
     34 #include <CoreGraphics/CGBitmapContext.h>
     35 #include <CoreGraphics/CGContext.h>
     36 #include <CoreGraphics/CGImage.h>
     37 #include <wtf/RetainPtr.h>
     38 #else
     39 #error "Need to implement for your platform"
     40 #endif
     41 
     42 namespace WebCore {
     43 
     44 PlatformImage::PlatformImage()
     45 {
     46 }
     47 
     48 void PlatformImage::updateFromImage(NativeImagePtr nativeImage)
     49 {
     50 #if USE(SKIA)
     51     // The layer contains an Image.
     52     NativeImageSkia* skiaImage = static_cast<NativeImageSkia*>(nativeImage);
     53     const SkBitmap* skiaBitmap = skiaImage;
     54 
     55     IntSize bitmapSize(skiaBitmap->width(), skiaBitmap->height());
     56     ASSERT(skiaBitmap);
     57 #elif USE(CG)
     58     // NativeImagePtr is a CGImageRef on Mac OS X.
     59     int width = CGImageGetWidth(nativeImage);
     60     int height = CGImageGetHeight(nativeImage);
     61     IntSize bitmapSize(width, height);
     62 #endif
     63 
     64     size_t bufferSize = bitmapSize.width() * bitmapSize.height() * 4;
     65     if (m_size != bitmapSize) {
     66         m_pixelData = adoptArrayPtr(new uint8_t[bufferSize]);
     67         memset(m_pixelData.get(), 0, bufferSize);
     68         m_size = bitmapSize;
     69     }
     70 
     71 #if USE(SKIA)
     72     SkAutoLockPixels lock(*skiaBitmap);
     73     // FIXME: do we need to support more image configurations?
     74     ASSERT(skiaBitmap->config()== SkBitmap::kARGB_8888_Config);
     75     skiaBitmap->copyPixelsTo(m_pixelData.get(), bufferSize);
     76 #elif USE(CG)
     77     // FIXME: we should get rid of this temporary copy where possible.
     78     int tempRowBytes = width * 4;
     79     // Note we do not zero this vector since we are going to
     80     // completely overwrite its contents with the image below.
     81     // Try to reuse the color space from the image to preserve its colors.
     82     // Some images use a color space (such as indexed) unsupported by the bitmap context.
     83     RetainPtr<CGColorSpaceRef> colorSpaceReleaser;
     84     CGColorSpaceRef colorSpace = CGImageGetColorSpace(nativeImage);
     85     CGColorSpaceModel colorSpaceModel = CGColorSpaceGetModel(colorSpace);
     86     switch (colorSpaceModel) {
     87     case kCGColorSpaceModelMonochrome:
     88     case kCGColorSpaceModelRGB:
     89     case kCGColorSpaceModelCMYK:
     90     case kCGColorSpaceModelLab:
     91     case kCGColorSpaceModelDeviceN:
     92         break;
     93     default:
     94         colorSpaceReleaser.adoptCF(CGColorSpaceCreateDeviceRGB());
     95         colorSpace = colorSpaceReleaser.get();
     96         break;
     97     }
     98     RetainPtr<CGContextRef> tempContext(AdoptCF, CGBitmapContextCreate(m_pixelData.get(),
     99                                                                        width, height, 8, tempRowBytes,
    100                                                                        colorSpace,
    101                                                                        kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
    102     CGContextSetBlendMode(tempContext.get(), kCGBlendModeCopy);
    103     CGContextDrawImage(tempContext.get(),
    104                        CGRectMake(0, 0, static_cast<CGFloat>(width), static_cast<CGFloat>(height)),
    105                        nativeImage);
    106 #else
    107 #error "Need to implement for your platform."
    108 #endif
    109 }
    110 
    111 } // namespace WebCore
    112