experimental

git-svn-id: http://skia.googlecode.com/svn/trunk@2320 2bbb7eff-a529-9590-31e7-b0007b416f81

include/core/SkImageFilter.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkImageFilter_DEFINED
+#define SkImageFilter_DEFINED
+
+#include "SkFlattenable.h"
+
+class SkImageFilter : public SkFlattenable {
+public:
+
+    /**
+     *  Request a new (result) image to be created from the src image.
+     *  If the src has no pixels (isNull()) then the request just wants to
+     *  receive the config and width/height of the result.
+     *
+     *  The matrix is the current matrix on the canvas.
+     *
+     *  Offset is the amount to translate the resulting image relative to the
+     *  src when it is drawn. 
+     *
+     *  If the result image cannot be created, return false, in which case both
+     *  the result and offset parameters will be ignored by the caller.
+     */
+    bool filterImage(const SkBitmap& src, const SkMatrix&,
+                     SkBitmap* result, SkPoint* offset);
+
+protected:
+    virtual bool onFilterImage(const SkBitmap& src, const SkMatrix&
+                               SkBitmap* result, SkPoint* offset) = 0;
+
+private:
+    typedef SkFlattenable INHERITED;
+};
+
+#endif