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/*
* Copyright (c) 2011, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "platform/image-encoders/skia/WEBPImageEncoder.h"
#include "platform/geometry/IntSize.h"
#include "platform/graphics/ImageBuffer.h"
#include "webp/encode.h"
typedef int (*WebPImporter)(WebPPicture* const, const uint8_t* const data, int rowStride);
namespace blink {
static int writeOutput(const uint8_t* data, size_t size, const WebPPicture* const picture)
{
static_cast<Vector<unsigned char>*>(picture->custom_ptr)->append(data, size);
return 1;
}
static bool rgbPictureImport(const unsigned char* pixels, WebPImporter importRGB, WebPPicture* picture)
{
// Write the RGB pixels to an rgb data buffer, alpha premultiplied, then import the rgb data.
size_t pixelCount = picture->height * picture->width;
OwnPtr<unsigned char[]> rgb = adoptArrayPtr(new unsigned char[pixelCount * 3]);
if (!rgb.get())
return false;
for (unsigned char* data = rgb.get(); pixelCount-- > 0; pixels += 4) {
unsigned char alpha = pixels[3];
if (alpha != 255) {
*data++ = SkMulDiv255Round(pixels[0], alpha);
*data++ = SkMulDiv255Round(pixels[1], alpha);
*data++ = SkMulDiv255Round(pixels[2], alpha);
} else {
*data++ = pixels[0];
*data++ = pixels[1];
*data++ = pixels[2];
}
}
return importRGB(picture, rgb.get(), picture->width * 3);
}
static bool encodePixels(IntSize imageSize, const unsigned char* pixels, int quality, Vector<unsigned char>* output)
{
if (imageSize.width() <= 0 || imageSize.width() > WEBP_MAX_DIMENSION)
return false;
if (imageSize.height() <= 0 || imageSize.height() > WEBP_MAX_DIMENSION)
return false;
WebPConfig config;
if (!WebPConfigInit(&config))
return false;
WebPPicture picture;
if (!WebPPictureInit(&picture))
return false;
picture.width = imageSize.width();
picture.height = imageSize.height();
if (!rgbPictureImport(pixels, &WebPPictureImportRGB, &picture))
return false;
picture.custom_ptr = output;
picture.writer = &writeOutput;
config.quality = quality;
config.method = 3;
bool success = WebPEncode(&config, &picture);
WebPPictureFree(&picture);
return success;
}
bool WEBPImageEncoder::encode(const ImageDataBuffer& imageData, int quality, Vector<unsigned char>* output)
{
if (!imageData.pixels())
return false;
return encodePixels(IntSize(imageData.width(), imageData.height()), imageData.pixels(), quality, output);
}
} // namespace blink
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