| /* |
| * 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 "config.h" |
| #include "core/platform/image-encoders/skia/WEBPImageEncoder.h" |
| |
| #include "SkBitmap.h" |
| #include "core/html/ImageData.h" |
| #include "platform/geometry/IntSize.h" |
| #include "webp/encode.h" |
| |
| typedef int (*WebPImporter)(WebPPicture* const, const uint8_t* const data, int rowStride); |
| |
| namespace WebCore { |
| |
| 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, bool premultiplied, WebPImporter importRGBX, WebPImporter importRGB, WebPPicture* picture) |
| { |
| if (premultiplied) |
| return importRGBX(picture, pixels, picture->width * 4); |
| |
| // Write the RGB pixels to an rgb data buffer, alpha premultiplied, then import the rgb data. |
| |
| Vector<unsigned char> rgb; |
| size_t pixelCount = picture->height * picture->width; |
| rgb.reserveInitialCapacity(pixelCount * 3); |
| |
| for (unsigned char* data = rgb.data(); 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.data(), picture->width * 3); |
| } |
| |
| template <bool Premultiplied> inline bool importPictureBGRX(const unsigned char* pixels, WebPPicture* picture) |
| { |
| return rgbPictureImport(pixels, Premultiplied, &WebPPictureImportBGRX, &WebPPictureImportBGR, picture); |
| } |
| |
| template <bool Premultiplied> inline bool importPictureRGBX(const unsigned char* pixels, WebPPicture* picture) |
| { |
| return rgbPictureImport(pixels, Premultiplied, &WebPPictureImportRGBX, &WebPPictureImportRGB, picture); |
| } |
| |
| static bool encodePixels(IntSize imageSize, const unsigned char* pixels, bool premultiplied, int quality, Vector<unsigned char>* output) |
| { |
| WebPConfig config; |
| if (!WebPConfigInit(&config)) |
| return false; |
| WebPPicture picture; |
| if (!WebPPictureInit(&picture)) |
| return false; |
| |
| imageSize.clampNegativeToZero(); |
| if (!imageSize.width() || imageSize.width() > WEBP_MAX_DIMENSION) |
| return false; |
| picture.width = imageSize.width(); |
| if (!imageSize.height() || imageSize.height() > WEBP_MAX_DIMENSION) |
| return false; |
| picture.height = imageSize.height(); |
| |
| if (premultiplied && !importPictureBGRX<true>(pixels, &picture)) |
| return false; |
| if (!premultiplied && !importPictureRGBX<false>(pixels, &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 SkBitmap& bitmap, int quality, Vector<unsigned char>* output) |
| { |
| SkAutoLockPixels bitmapLock(bitmap); |
| |
| if (bitmap.config() != SkBitmap::kARGB_8888_Config || !bitmap.getPixels()) |
| return false; // Only support 32 bit/pixel skia bitmaps. |
| |
| return encodePixels(IntSize(bitmap.width(), bitmap.height()), static_cast<unsigned char *>(bitmap.getPixels()), true, quality, output); |
| } |
| |
| bool WEBPImageEncoder::encode(const ImageData& imageData, int quality, Vector<unsigned char>* output) |
| { |
| return encodePixels(imageData.size(), imageData.data()->data(), false, quality, output); |
| } |
| |
| } // namespace WebCore |