gecko-dev/gfx/2d/SourceSurfaceCG.cpp

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Corporation code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Jeff Muizelaar <jmuizelaar@mozilla.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "SourceSurfaceCG.h"

namespace mozilla {
namespace gfx {

SourceSurfaceCG::SourceSurfaceCG()
{
}

SourceSurfaceCG::~SourceSurfaceCG()
{
  CGImageRelease(mImage);
}

IntSize
SourceSurfaceCG::GetSize() const
{
  IntSize size;
  size.width = CGImageGetHeight(mImage);
  size.height = CGImageGetWidth(mImage);
  return size;
}

SurfaceFormat
SourceSurfaceCG::GetFormat() const
{
  return mFormat;
}

TemporaryRef<DataSourceSurface>
SourceSurfaceCG::GetDataSurface()
{
  return NULL;
}


static void releaseCallback(void *info, const void *data, size_t size) {
  free(info);
}

bool
SourceSurfaceCG::InitFromData(unsigned char *aData,
                               const IntSize &aSize,
                               int32_t aStride,
                               SurfaceFormat aFormat)
{
  //XXX: we should avoid creating this colorspace everytime
  CGColorSpaceRef colorSpace = NULL;
  CGBitmapInfo bitinfo = 0;
  CGDataProviderRef dataProvider = NULL;
  int bitsPerComponent = 0;
  int bitsPerPixel = 0;

  switch (aFormat) {
    case B8G8R8A8:
      colorSpace = CGColorSpaceCreateDeviceRGB();
      bitinfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host;
      bitsPerComponent = 8;
      bitsPerPixel = 32;
      break;

    case B8G8R8X8:
      colorSpace = CGColorSpaceCreateDeviceRGB();
      bitinfo = kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host;
      bitsPerComponent = 8;
      bitsPerPixel = 32;
      break;

    case A8:
      // XXX: why don't we set a colorspace here?
      bitsPerComponent = 8;
      bitsPerPixel = 8;
  };

  void *data = malloc(aStride * aSize.height);
  memcpy(data, aData, aStride * aSize.height);

  mFormat = aFormat;

  dataProvider = CGDataProviderCreateWithData (data,
                                               data,
					       aSize.height * aStride,
					       releaseCallback);

  if (aFormat == A8) {
    CGFloat decode[] = {1.0, 0.0};
    mImage = CGImageMaskCreate (aSize.width, aSize.height,
				bitsPerComponent,
				bitsPerPixel,
				aStride,
				dataProvider,
				decode,
				true);

  } else {
    mImage = CGImageCreate (aSize.width, aSize.height,
			    bitsPerComponent,
			    bitsPerPixel,
			    aStride,
			    colorSpace,
			    bitinfo,
			    dataProvider,
			    NULL,
			    true,
			    kCGRenderingIntentDefault);
  }

  CGDataProviderRelease(dataProvider);
  CGColorSpaceRelease (colorSpace);

  if (mImage) {
    return false;
  }

  return true;
}

}
}