Remove Source/platform/image-encoders/skia

third_party/WebKit/Source/platform/image-encoders/skia/PNGImageEncoder.cpp

-/*
- * Copyright (c) 2010, 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/PNGImageEncoder.h"
-
-#include "platform/graphics/ImageBuffer.h"
-#include "wtf/OwnPtr.h"
-
-namespace blink {
-
-PNGImageEncoderState::~PNGImageEncoderState()
-{
-    png_destroy_write_struct(&m_png, &m_info);
-}
-
-static void writeOutput(png_structp png, png_bytep data, png_size_t size)
-{
-    static_cast<Vector<unsigned char>*>(png_get_io_ptr(png))->append(data, size);
-}
-
-PassOwnPtr<PNGImageEncoderState> PNGImageEncoderState::create(const IntSize& imageSize, Vector<unsigned char>* output)
-{
-    if (imageSize.width() <= 0 || imageSize.height() <= 0)
-        return nullptr;
-
-    png_struct* png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
-    png_info* info = png_create_info_struct(png);
-    if (!png || !info || setjmp(png_jmpbuf(png))) {
-        png_destroy_write_struct(png ? &png : 0, info ? &info : 0);
-        return nullptr;
-    }
-
-    // Optimize compression for speed.
-    // The parameters are the same as what libpng uses by default for RGB and RGBA images, except:
-    // - the zlib compression level is 3 instead of 6, to avoid the lazy Ziv-Lempel match searching;
-    // - the delta filter is 1 ("sub") instead of 5 ("all"), to reduce the filter computations.
-    // The zlib memory level (8) and strategy (Z_FILTERED) will be set inside libpng.
-    //
-    // Avoid the zlib strategies Z_HUFFMAN_ONLY or Z_RLE.
-    // Although they are the fastest for poorly-compressible images (e.g. photographs),
-    // they are very slow for highly-compressible images (e.g. text, drawings or business graphics)
-    png_set_compression_level(png, 3);
-    png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);
-
-    png_set_write_fn(png, output, writeOutput, 0);
-    png_set_IHDR(png, info, imageSize.width(), imageSize.height(),
-                 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0, 0);
-    png_write_info(png, info);
-
-    return adoptPtr(new PNGImageEncoderState(png, info));
-}
-
-void PNGImageEncoder::writeOneRowToPng(unsigned char* pixels, PNGImageEncoderState* encoderState)
-{
-    png_write_row(encoderState->png(), pixels);
-}
-
-void PNGImageEncoder::finalizePng(PNGImageEncoderState* encoderState)
-{
-    png_write_end(encoderState->png(), encoderState->info());
-}
-
-static bool encodePixels(const IntSize& imageSize, const unsigned char* inputPixels, Vector<unsigned char>* output)
-{
-    OwnPtr<PNGImageEncoderState> encoderState = PNGImageEncoderState::create(imageSize, output);
-    if (!encoderState.get())
-        return false;
-
-    unsigned char* pixels = const_cast<unsigned char*>(inputPixels);
-    const size_t pixelRowStride = imageSize.width() * 4;
-    for (int y = 0; y < imageSize.height(); ++y) {
-        PNGImageEncoder::writeOneRowToPng(pixels, encoderState.get());
-        pixels += pixelRowStride;
-    }
-
-    PNGImageEncoder::finalizePng(encoderState.get());
-    return true;
-}
-
-bool PNGImageEncoder::encode(const ImageDataBuffer& imageData, Vector<unsigned char>* output)
-{
-    if (!imageData.pixels())
-        return false;
-
-    return encodePixels(imageData.size(), imageData.pixels(), output);
-}
-
-} // namespace blink