Added SkClipStack portion of new clip mask caching system
http://codereview.appspot.com/6449089/
git-svn-id: http://skia.googlecode.com/svn/trunk@4978 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/core/SkClipStack.h b/include/core/SkClipStack.h
index 4c79c2f..077c4b7 100644
--- a/include/core/SkClipStack.h
+++ b/include/core/SkClipStack.h
@@ -10,6 +10,7 @@
#include "SkDeque.h"
#include "SkRegion.h"
+#include "SkTDArray.h"
struct SkRect;
class SkPath;
@@ -76,6 +77,29 @@
*/
bool isWideOpen() const;
+ /**
+ * Add a callback function that will be called whenever a clip state
+ * is no longer viable. This will occur whenever restore
+ * is called or when a clipDevRect or clipDevPath call updates the
+ * clip within an existing save/restore state. Each clip state is
+ * represented by a unique generation ID.
+ */
+ typedef void (*PFPurgeClipCB)(int genID, void* data);
+ void addPurgeClipCallback(PFPurgeClipCB callback, void* data) const;
+
+ /**
+ * Remove a callback added earlier via addPurgeClipCallback
+ */
+ void removePurgeClipCallback(PFPurgeClipCB callback, void* data) const;
+
+ /**
+ * The generation ID has three reserved values to indicate special
+ * (potentially ignoreable) cases
+ */
+ static const int32_t kInvalidGenID = 0;
+ static const int32_t kEmptyGenID = 1; // no pixels writeable
+ static const int32_t kWideOpenGenID = 2; // all pixels writeable
+
private:
struct Rec;
@@ -198,6 +222,33 @@
SkDeque fDeque;
int fSaveCount;
+
+ // Generation ID for the clip stack. This is incremented for each
+ // clipDevRect and clipDevPath call. 0 is reserved to indicate an
+ // invalid ID.
+ static int32_t gGenID;
+
+ struct ClipCallbackData {
+ PFPurgeClipCB fCallback;
+ void* fData;
+
+ friend bool operator==(const ClipCallbackData& a,
+ const ClipCallbackData& b) {
+ return a.fCallback == b.fCallback && a.fData == b.fData;
+ }
+ };
+
+ mutable SkTDArray<ClipCallbackData> fCallbackData;
+
+ /**
+ * Invoke all the purge callbacks passing in rec's generation ID.
+ */
+ void purgeClip(Rec* rec);
+
+ /**
+ * Return the next unique generation ID.
+ */
+ static int32_t GetNextGenID();
};
#endif