grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/effects/SkLayerRasterizer.h b/include/effects/SkLayerRasterizer.h
new file mode 100644
index 0000000..820f6fc
--- /dev/null
+++ b/include/effects/SkLayerRasterizer.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SkLayerRasterizer_DEFINED
+#define SkLayerRasterizer_DEFINED
+
+#include "SkRasterizer.h"
+#include "SkDeque.h"
+#include "SkScalar.h"
+
+class SkPaint;
+
+class SkLayerRasterizer : public SkRasterizer {
+public:
+ SkLayerRasterizer();
+ virtual ~SkLayerRasterizer();
+
+ void addLayer(const SkPaint& paint)
+ {
+ this->addLayer(paint, 0, 0);
+ }
+
+ /** Add a new layer (above any previous layers) to the rasterizer.
+ The layer will extract those fields that affect the mask from
+ the specified paint, but will not retain a reference to the paint
+ object itself, so it may be reused without danger of side-effects.
+ */
+ void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy);
+
+ // overrides from SkFlattenable
+ virtual Factory getFactory();
+ virtual void flatten(SkFlattenableWriteBuffer&);
+
+protected:
+ SkLayerRasterizer(SkFlattenableReadBuffer&);
+
+ // override from SkRasterizer
+ virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix,
+ const SkIRect* clipBounds,
+ SkMask* mask, SkMask::CreateMode mode);
+
+private:
+ SkDeque fLayers;
+
+ static SkFlattenable* CreateProc(SkFlattenableReadBuffer&);
+
+ typedef SkRasterizer INHERITED;
+};
+
+#endif