This change implements a first pass in the effort to remove the dependency of PlatformDevice within Chrome. The Skia library now provides multiple back-ends for the SkDevice class, so PlatformDevice's inheritance of SkDevice, and the assumption of instances of PlatformDevice limits the use of these new back-ends.

A new set of helper functions is provided for the PlatformDevice entry points.  Upon construction of a PlatformDevice, a pointer to the interface is cached in the parent SkDevice's SkMetaData.  The new helper functions forward calls to the interface cached in the metadata.

BUG=NONE
TEST=NONE
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=86625
Reverted:  http://src.chromium.org/viewvc/chrome?view=rev&revision=86625
Review URL: http://codereview.chromium.org/7019013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86823 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 74 insertions, 0 deletions

diff --git a/skia/ext/platform_device.cc b/skia/ext/platform_device.cc
new file mode 100644
index 0000000..eff5d4f
--- /dev/null
+++ b/skia/ext/platform_device.cc
@@ -0,0 +1,74 @@
+// Copyright (c) 2011 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_device.h"
+
+#include "third_party/skia/include/core/SkMetaData.h"
+
+namespace skia {
+
+namespace {
+const char* kDevicePlatformBehaviour = "CrDevicePlatformBehaviour";
+}
+
+void SetPlatformDevice(SkDevice* device, PlatformDevice* platform_behaviour) {
+  SkMetaData& meta_data = device->getMetaData();
+  meta_data.setPtr(kDevicePlatformBehaviour, platform_behaviour);
+}
+
+PlatformDevice* GetPlatformDevice(SkDevice* device) {
+  SkMetaData& meta_data = device->getMetaData();
+  PlatformDevice* device_behaviour = NULL;
+  if (meta_data.findPtr(kDevicePlatformBehaviour,
+                        reinterpret_cast<void**>(&device_behaviour)))
+    return device_behaviour;
+
+  return NULL;
+}
+
+PlatformSurface BeginPlatformPaint(SkDevice* device) {
+  PlatformDevice* platform_device = GetPlatformDevice(device);
+  if (platform_device)
+    return platform_device->BeginPlatformPaint();
+
+  return 0;
+}
+
+void EndPlatformPaint(SkDevice* device) {
+  PlatformDevice* platform_device = GetPlatformDevice(device);
+  if (platform_device)
+    return platform_device->EndPlatformPaint();
+}
+
+bool IsVectorial(SkDevice* device) {
+  PlatformDevice* platform_device = GetPlatformDevice(device);
+  if (platform_device)
+    return platform_device->IsVectorial();
+
+  return device->getDeviceCapabilities() & SkDevice::kVector_Capability;
+}
+
+bool IsNativeFontRenderingAllowed(SkDevice* device) {
+  PlatformDevice* platform_device = GetPlatformDevice(device);
+  if (platform_device)
+    return platform_device->IsNativeFontRenderingAllowed();
+
+  return false;
+}
+
+void DrawToNativeContext(SkDevice* device, PlatformSurface context,
+                         int x, int y, const PlatformRect* src_rect) {
+  PlatformDevice* platform_device = GetPlatformDevice(device);
+  if (platform_device)
+    platform_device->DrawToNativeContext(context, x, y, src_rect);
+}
+
+void MakeOpaque(SkDevice* device, int x, int y, int width, int height) {
+  PlatformDevice* platform_device = GetPlatformDevice(device);
+  if (platform_device)
+    platform_device->MakeOpaque(x, y, width, height);
+}
+
+}  // namespace skia
+