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
ReencodeFavicon(const unsigned char * src_data,size_t src_len,std::vector<unsigned char> * png_data)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
42