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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 "PlatformCanvas.h"
     29 
     30 #include "GraphicsContext.h"
     31 
     32 #if USE(SKIA)
     33 #include "NativeImageSkia.h"
     34 #include "PlatformContextSkia.h"
     35 #include "SkColorPriv.h"
     36 #include "skia/ext/platform_canvas.h"
     37 #elif USE(CG)
     38 #include <CoreGraphics/CGBitmapContext.h>
     39 #endif
     40 
     41 namespace WebCore {
     42 
     43 PlatformCanvas::PlatformCanvas()
     44 {
     45 }
     46 
     47 PlatformCanvas::~PlatformCanvas()
     48 {
     49 }
     50 
     51 void PlatformCanvas::resize(const IntSize& size)
     52 {
     53     m_size = size;
     54 #if USE(SKIA)
     55     m_skiaCanvas = skia::CreateBitmapCanvas(size.width(), size.height(), false);
     56 #elif USE(CG)
     57     size_t bufferSize = size.width() * size.height() * 4;
     58     m_pixelData = adoptArrayPtr(new uint8_t[bufferSize]);
     59     memset(m_pixelData.get(), 0, bufferSize);
     60 #endif
     61 }
     62 
     63 PlatformCanvas::AutoLocker::AutoLocker(PlatformCanvas* canvas)
     64     : m_canvas(canvas)
     65     , m_pixels(0)
     66 {
     67 #if USE(SKIA)
     68     if (m_canvas->m_skiaCanvas) {
     69         m_bitmap = &m_canvas->m_skiaCanvas->getDevice()->accessBitmap(false);
     70         m_bitmap->lockPixels();
     71 
     72         if (m_bitmap->config() == SkBitmap::kARGB_8888_Config)
     73             m_pixels = static_cast<uint8_t*>(m_bitmap->getPixels());
     74     } else
     75         m_bitmap = 0;
     76 #elif USE(CG)
     77     if (canvas->m_pixelData)
     78         m_pixels = &canvas->m_pixelData[0];
     79 #endif
     80 }
     81 
     82 PlatformCanvas::AutoLocker::~AutoLocker()
     83 {
     84 #if USE(SKIA)
     85     if (m_bitmap)
     86         m_bitmap->unlockPixels();
     87 #endif
     88 }
     89 
     90 PlatformCanvas::Painter::Painter(PlatformCanvas* canvas, PlatformCanvas::Painter::TextOption option)
     91 {
     92 #if USE(SKIA)
     93     m_skiaContext = adoptPtr(new PlatformContextSkia(canvas->m_skiaCanvas.get()));
     94 
     95     m_skiaContext->setDrawingToImageBuffer(option == GrayscaleText);
     96 
     97     m_context = adoptPtr(new GraphicsContext(reinterpret_cast<PlatformGraphicsContext*>(m_skiaContext.get())));
     98 #elif USE(CG)
     99 
    100     m_colorSpace = CGColorSpaceCreateDeviceRGB();
    101     size_t rowBytes = canvas->size().width() * 4;
    102     m_contextCG = CGBitmapContextCreate(canvas->m_pixelData.get(),
    103                                         canvas->size().width(), canvas->size().height(), 8, rowBytes,
    104                                         m_colorSpace.get(),
    105                                         kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
    106     CGContextTranslateCTM(m_contextCG.get(), 0, canvas->size().height());
    107     CGContextScaleCTM(m_contextCG.get(), 1, -1);
    108     m_context = adoptPtr(new GraphicsContext(m_contextCG.get()));
    109 #endif
    110 }
    111 
    112 PlatformCanvas::Painter::~Painter()
    113 {
    114 }
    115 
    116 } // namespace WebCore
    117