aura: Use platform independent skia::PlatformCanvas when possible.

skia/ext/platform_canvas_skia.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "skia/ext/platform_canvas.h"
+
+#include "base/debug/trace_event.h"
+#include "skia/ext/bitmap_platform_device.h"
+
+namespace skia {
+
+PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque) {
+  TRACE_EVENT2("skia", "PlatformCanvas::PlatformCanvas",
+               "width", width, "height", height);
+  if (!initialize(width, height, is_opaque))
+    SK_CRASH();
+}
+
+#if defined(WIN32)
+PlatformCanvas::PlatformCanvas(int width,
+                               int height,
+                               bool is_opaque,
+                               HANDLE shared_section) {
+  TRACE_EVENT2("skia", "PlatformCanvas::PlatformCanvas",
+               "width", width, "height", height);
+  if (!initialize(width, height, is_opaque, shared_section))
+    SK_CRASH();
+}
+#else
+PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque,
+                               uint8_t* data) {
+  TRACE_EVENT2("skia", "PlatformCanvas::PlatformCanvas",
+               "width", width, "height", height);
+  if (!initialize(width, height, is_opaque, data))
+    SK_CRASH();
+}
+#endif
+
+PlatformCanvas::~PlatformCanvas() {
+}
+
+#if defined(WIN32)
+bool PlatformCanvas::initialize(int width,
+                                int height,
+                                bool is_opaque,
+                                HANDLE shared_section) {
+  // Use platform specific device for shared_section.
+  if (shared_section) {
+    if (initializeWithDevice(BitmapPlatformDevice::Create(width,
+                                                          height,
+                                                          is_opaque,
+                                                          shared_section)))
+      return true;
+    // Investigate we failed. If we know the reason, crash in a specific place.
+    unsigned int error = GetLastError();
+    if (shared_section)
+      CrashIfInvalidSection(shared_section);
+    CrashForBitmapAllocationFailure(width, height, error);
+    return false;
+  }
+
+  return initializeWithDevice(new SkDevice(
+      SkBitmap::kARGB_8888_Config, width, height, is_opaque));
+}
+#else
+bool PlatformCanvas::initialize(int width, int height, bool is_opaque,
+                                uint8_t* data) {
+  // Use platform specific device for data.
+  if (data)
+    return initializeWithDevice(BitmapPlatformDevice::Create(
+        width, height, is_opaque, data));
+
+  return initializeWithDevice(new SkDevice(
+      SkBitmap::kARGB_8888_Config, width, height, is_opaque));
+}
+#endif
+
+}  // namespace skia