ui/surface/transport_dib.cc

   1 // Copyright (c) 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 "ui/surface/transport_dib.h"
   6
   7 #include "skia/ext/platform_canvas.h"
   8
   9 // static
  10 bool TransportDIB::VerifyCanvasSize(int w, int h) {
  11   static const size_t kMaxSize = static_cast<size_t>(INT_MAX);
  12   const size_t one_stride = skia::PlatformCanvasStrideForWidth(1);
  13   const size_t stride = skia::PlatformCanvasStrideForWidth(w);
  14   if (w <= 0 || h <= 0 || static_cast<size_t>(w) > (kMaxSize / one_stride) ||
  15       static_cast<size_t>(h) > (kMaxSize / stride)) {
  16     return false;
  17   }
  18
  19   return (stride * h) <= size_;
  20 }
  21
  22 base::SharedMemory* TransportDIB::shared_memory() {
  23   return &shared_memory_;
  24 }