image_png_rep.cc revision c2e0dbddbe15c98d52c4786dac06cb8952a8ae6d 
1// Copyright (c) 2012 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 "ui/gfx/image/image_png_rep.h"
6
7#include "third_party/skia/include/core/SkBitmap.h"
8#include "ui/gfx/codec/png_codec.h"
9#include "ui/gfx/size.h"
10
11namespace gfx {
12
13ImagePNGRep::ImagePNGRep()
14    : raw_data(NULL),
15      scale_factor(ui::SCALE_FACTOR_NONE) {
16}
17
18ImagePNGRep::ImagePNGRep(const scoped_refptr<base::RefCountedMemory>& data,
19                         ui::ScaleFactor data_scale_factor)
20    : raw_data(data),
21      scale_factor(data_scale_factor) {
22}
23
24ImagePNGRep::~ImagePNGRep() {
25}
26
27gfx::Size ImagePNGRep::Size() const {
28  // The only way to get the width and height of a raw PNG stream, at least
29  // using the gfx::PNGCodec API, is to decode the whole thing.
30  CHECK(raw_data.get());
31  SkBitmap bitmap;
32  if (!gfx::PNGCodec::Decode(raw_data->front(), raw_data->size(),
33                             &bitmap)) {
34    LOG(ERROR) << "Unable to decode PNG.";
35    return gfx::Size(0, 0);
36  }
37  return gfx::Size(bitmap.width(), bitmap.height());
38}
39
40}  // namespace gfx
41