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 "third_party/skia/include/core/SkBitmap.h"
   8 #include "ui/gfx/codec/png_codec.h"
   9 #include "ui/gfx/size.h"
  10
  11 namespace gfx {
  12
  13 ImagePNGRep::ImagePNGRep()
  14     : raw_data(NULL),
  15       scale_factor(ui::SCALE_FACTOR_NONE) {
  16 }
  17
  18 ImagePNGRep::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
  24 ImagePNGRep::~ImagePNGRep() {
  25 }
  26
  27 gfx::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