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
Review URL: http://codereview.chromium.org/7019013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86625 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 75 insertions, 0 deletions

diff --git a/skia/ext/platform_device.h b/skia/ext/platform_device.h
index 971c0a7..4f876d9 100644
--- a/skia/ext/platform_device.h
+++ b/skia/ext/platform_device.h
@@ -10,6 +10,81 @@
 // header file for your platform.
 
 #if defined(WIN32)
+#include <windows.h>
+#endif
+
+#include "third_party/skia/include/core/SkPreConfig.h"
+#include "third_party/skia/include/core/SkColor.h"
+
+
+class SkDevice;
+struct SkIRect;
+
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+typedef struct _cairo cairo_t;
+typedef struct _cairo_rectangle cairo_rectangle_t;
+#elif defined(__APPLE__)
+typedef struct CGContext* CGContextRef;
+typedef struct CGRect CGRect;
+#endif
+
+namespace skia {
+
+class PlatformDevice;
+
+#if defined(WIN32)
+typedef HDC PlatformSurface;
+typedef RECT PlatformRect;
+#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+typedef cairo_t* PlatformSurface;
+typedef cairo_rectangle_t PlatformRect;
+#elif defined(__APPLE__)
+typedef CGContextRef PlatformSurface;
+typedef CGRect PlatformRect;
+#endif
+
+// The following routines provide accessor points for the functionality
+// exported by the various PlatformDevice ports.  The PlatformDevice, and
+// BitmapPlatformDevice classes inherit directly from SkDevice, which is no
+// longer a supported usage-pattern for skia.  In preparation of the removal of
+// these classes, all calls to PlatformDevice::* should be routed through these
+// helper functions.
+
+// Bind a PlatformDevice instance, |platform_device| to |device|.  Subsequent
+// calls to the functions exported below will forward the request to the
+// corresponding method on the bound PlatformDevice instance.    If no
+// PlatformDevice has been bound to the SkDevice passed, then the routines are
+// NOPS.
+SK_API void SetPlatformDevice(SkDevice* device,
+                              PlatformDevice* platform_device);
+SK_API PlatformDevice* GetPlatformDevice(SkDevice* device);
+
+// Returns if the preferred rendering engine is vectorial or bitmap based.
+// Forwards to PlatformDevice::IsVectorial, if a PlatformDevice is bound,
+// otherwise falls-back to the SkDevice::getDeviceCapabilities routine.
+SK_API bool IsVectorial(SkDevice* device);
+
+// Returns if the native font rendering engine is allowed to render text to
+// this device.
+SK_API bool IsNativeFontRenderingAllowed(SkDevice* device);
+
+// Returns the PlatformSurface used for native rendering into the device.
+SK_API PlatformSurface BeginPlatformPaint(SkDevice* device);
+
+// Finish a previous call to BeginPlatformPaint.
+SK_API void EndPlatformPaint(SkDevice* device);
+
+// Draws to the given PlatformSurface, |context|. Forwards to the
+// PlatformDevice bound to |device|.  Otherwise is a NOP.
+SK_API void DrawToNativeContext(SkDevice* device, PlatformSurface context,
+                                int x, int y, const PlatformRect* src_rect);
+
+// Sets the opacity of each pixel in the specified region to be opaque.
+SK_API void MakeOpaque(SkDevice* device, int x, int y, int width, int height);
+
+}  // namespace skia
+
+#if defined(WIN32)
 #include "skia/ext/platform_device_win.h"
 #elif defined(__APPLE__)
 #include "skia/ext/platform_device_mac.h"