Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/image-encoders/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
@@ skipping 13 matching lines @@
  * 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/PNGImageEncoder.h"
 
 #include "platform/graphics/ImageBuffer.h"
-#include "wtf/PtrUtil.h"
-#include <memory>
+#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);
 }
 
-std::unique_ptr<PNGImageEncoderState> PNGImageEncoderState::create(const IntSize& imageSize, Vector<unsigned char>* output)
+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 wrapUnique(new PNGImageEncoderState(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)
 {
-    std::unique_ptr<PNGImageEncoderState> encoderState = PNGImageEncoderState::create(imageSize, 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