ui/gfx/image/image_png_rep.cc

   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 "base/logging.h"
   8 #include "third_party/skia/include/core/SkBitmap.h"
   9 #include "ui/gfx/codec/png_codec.h"
  10 #include "ui/gfx/size.h"
  11
  12 namespace gfx {
  13
  14 ImagePNGRep::ImagePNGRep()
  15     : raw_data(NULL),
  16       scale(1.0) {
  17 }
  18
  19 ImagePNGRep::ImagePNGRep(const scoped_refptr<base::RefCountedMemory>& data,
  20                          float data_scale)
  21     : raw_data(data),
  22       scale(data_scale) {
  23 }
  24
  25 ImagePNGRep::~ImagePNGRep() {
  26 }
  27
  28 gfx::Size ImagePNGRep::Size() const {
  29   // The only way to get the width and height of a raw PNG stream, at least
  30   // using the gfx::PNGCodec API, is to decode the whole thing.
  31   CHECK(raw_data.get());
  32   SkBitmap bitmap;
  33   if (!gfx::PNGCodec::Decode(raw_data->front(), raw_data->size(),
  34                              &bitmap)) {
  35     LOG(ERROR) << "Unable to decode PNG.";
  36     return gfx::Size(0, 0);
  37   }
  38   return gfx::Size(bitmap.width(), bitmap.height());
  39 }
  40
  41 }  // namespace gfx