chrome/utility/importer/favicon_reencode.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/utility/importer/favicon_reencode.h"
   6
   7 #include "content/public/child/image_decoder_utils.h"
   8 #include "skia/ext/image_operations.h"
   9 #include "third_party/skia/include/core/SkBitmap.h"
  10 #include "ui/gfx/codec/png_codec.h"
  11 #include "ui/gfx/favicon_size.h"
  12
  13 namespace importer {
  14
  15 bool ReencodeFavicon(const unsigned char* src_data,
  16                      size_t src_len,
  17                      std::vector<unsigned char>* png_data) {
  18   // Decode the favicon using WebKit's image decoder.
  19   SkBitmap decoded = content::DecodeImage(
  20       src_data,
  21       gfx::Size(gfx::kFaviconSize, gfx::kFaviconSize),
  22       src_len);
  23   if (decoded.empty())
  24     return false;  // Unable to decode.
  25
  26   if (decoded.width() != gfx::kFaviconSize ||
  27       decoded.height() != gfx::kFaviconSize) {
  28     // The bitmap is not the correct size, re-sample.
  29     int new_width = decoded.width();
  30     int new_height = decoded.height();
  31     gfx::CalculateFaviconTargetSize(&new_width, &new_height);
  32     decoded = skia::ImageOperations::Resize(
  33         decoded, skia::ImageOperations::RESIZE_LANCZOS3, new_width, new_height);
  34   }
  35
  36   // Encode our bitmap as a PNG.
  37   gfx::PNGCodec::EncodeBGRASkBitmap(decoded, false, png_data);
  38   return true;
  39 }
  40
  41 }  // namespace importer