Refactor the PlatformContext layer to have only one class.

Previously we had three classes of PlatformCanvas*, one for each platform. Then
we had a typedef of PlatformContext to PlatformCanvas[Mac|Win|Linux] for the
specific platform.

This means that it was almost impossible to forward-declare PlatformCanvas and
there were a bunch of unnecessary includes of platform_canvas.h in header
files.

This change makes there be only one platform_canvas.h header with ifdefs, which
removes a decent amount of duplicated code. There is a platform-independent
file, and one platform-dependent file of platform_canvas for each platform.

I also renamed PlatformDevice[Mac|Win|Linux] to PlatformDevice, althouth in
this case I kept the separate headers since there was much less overlap.

I also broke out CanvasPaint into separate headers so this template doesn't
need to be included all over the project (only a couple of files actually need
it).

Review URL: http://codereview.chromium.org/125109

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18363 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 13 deletions

diff --git a/skia/ext/platform_device.h b/skia/ext/platform_device.h
index 413a47f..00845ca 100644
--- a/skia/ext/platform_device.h
+++ b/skia/ext/platform_device.h
@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Declare a platform-neutral name for this platform's device class
-// that can be used by upper-level classes that just need to pass a reference
-// around.
+#ifndef SKIA_EXT_PLATFORM_DEVICE_H_
+#define SKIA_EXT_PLATFORM_DEVICE_H_
+
+// This file provides an easy way to include the appropriate PlatformDevice
+// header file for your platform.
 
 #if defined(WIN32)
 #include "skia/ext/platform_device_win.h"
@@ -14,14 +16,4 @@
 #include "skia/ext/platform_device_linux.h"
 #endif
 
-namespace skia {
-
-#if defined(WIN32)
-typedef PlatformDeviceWin PlatformDevice;
-#elif defined(__APPLE__)
-typedef PlatformDeviceMac PlatformDevice;
-#elif defined(__linux__)
-typedef PlatformDeviceLinux PlatformDevice;
 #endif
-
-}  // namespace skia