add gpu backend (not hooked up yet)
git-svn-id: http://skia.googlecode.com/svn/trunk@649 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrClipIterator.h b/gpu/include/GrClipIterator.h
new file mode 100644
index 0000000..d1fe4dd
--- /dev/null
+++ b/gpu/include/GrClipIterator.h
@@ -0,0 +1,81 @@
+/*
+ Copyright 2010 Google Inc.
+
+ 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 GrClipIterator_DEFINED
+#define GrClipIterator_DEFINED
+
+#include "GrRect.h"
+
+class GrClipIterator {
+public:
+ GrClipIterator() : fNeedBounds(true) {}
+ virtual ~GrClipIterator() {}
+
+ /**
+ * Returns true if there are no more rects to process
+ */
+ virtual bool isDone() = 0;
+
+ /**
+ * Rewind the iterate to replay the set of rects again
+ */
+ virtual void rewind() = 0;
+
+ /**
+ * Return the current rect. It is an error to call this when done() is true
+ */
+ virtual void getRect(GrIRect*) = 0;
+
+ /**
+ * Call to move to the next rect in the set
+ */
+ virtual void next() = 0;
+
+ /**
+ * Set bounds to be the bounds of the clip.
+ */
+ virtual void computeBounds(GrIRect* bounds) = 0;
+
+ /**
+ * Subclass should call this whenever their underlying bounds has changed.
+ */
+ void invalidateBoundsCache() { fNeedBounds = true; }
+
+ const GrIRect& getBounds() {
+ if (fNeedBounds) {
+ this->computeBounds(&fBounds);
+ fNeedBounds = false;
+ }
+ return fBounds;
+ }
+
+private:
+ GrIRect fBounds;
+ bool fNeedBounds;
+};
+
+/**
+ * Call to rewind iter, first checking to see if iter is NULL
+ */
+static inline void GrSafeRewind(GrClipIterator* iter) {
+ if (iter) {
+ iter->rewind();
+ }
+}
+
+#endif
+