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
13namespace importer {
14
15bool 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
42