add experimental wrapper for region+aaclip

git-svn-id: http://skia.googlecode.com/svn/trunk@2451 2bbb7eff-a529-9590-31e7-b0007b416f81

src/core/SkRasterClip.cpp

@@ -0,0 +1,104 @@
+/*
+ * Copyright 2010 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkRasterClip.h"
+
+
+SkRasterClip::SkRasterClip() {
+    fIsBW = true;
+}
+
+bool SkRasterClip::isEmpty() const {
+    return fIsBW ? fBW.isEmpty() : fAA.isEmpty();
+}
+
+bool SkRasterClip::isRect() const {
+    return fIsBW ? fBW.isRect() : false;
+}
+
+bool SkRasterClip::isComplex() const {
+    return fIsBW ? fBW.isComplex() : !fAA.isEmpty();
+}
+
+const SkIRect& SkRasterClip::getBounds() const {
+    return fIsBW ? fBW.getBounds() : fAA.getBounds();
+}
+
+bool SkRasterClip::setEmpty() {
+    fIsBW = true;
+    fBW.setEmpty();
+    fAA.setEmpty();
+    return false;
+}
+
+bool SkRasterClip::setIRect(const SkIRect& rect) {
+    fIsBW = true;
+    fAA.setEmpty();
+    return fBW.setRect(rect);
+}
+
+bool SkRasterClip::setPath(const SkPath& path, const SkRegion& clip, bool doAA) {
+    if (this->isBW() && !doAA) {
+        return fBW.setPath(path, clip);
+    } else {
+        if (this->isBW()) {
+            this->convertToAA();
+        }
+        return fAA.setPath(path, &clip, doAA);
+    }
+}
+
+bool SkRasterClip::setPath(const SkPath& path, const SkIRect& clip, bool doAA) {
+    SkRegion tmp;
+    tmp.setRect(clip);
+    return this->setPath(path, tmp, doAA);
+}
+
+bool SkRasterClip::setPath(const SkPath& path, const SkRasterClip& clip,
+                           bool doAA) {
+    if (clip.isBW()) {
+        return this->setPath(path, clip.bwRgn(), doAA);
+    } else {
+        SkRegion tmp;
+        tmp.setRect(clip.getBounds());
+        if (!this->setPath(path, clip, doAA)) {
+            return false;
+        }
+        return this->op(clip, SkRegion::kIntersect_Op);
+    }
+}
+
+bool SkRasterClip::op(const SkIRect& rect, SkRegion::Op op) {
+    return fIsBW ? fBW.op(rect, op) : fAA.op(rect, op);
+}
+
+bool SkRasterClip::op(const SkRasterClip& clip, SkRegion::Op op) {
+    if (this->isBW() && clip.isBW()) {
+        return fBW.op(clip.fBW, op);
+    } else {
+        SkAAClip tmp;
+        const SkAAClip* other;
+
+        if (this->isBW()) {
+            this->convertToAA();
+        }
+        if (clip.isBW()) {
+            tmp.setRegion(clip.bwRgn());
+            other = &tmp;
+        } else {
+            other = &clip.aaRgn();
+        }
+        return fAA.op(*other, op);
+    }
+}
+
+void SkRasterClip::convertToAA() {
+    SkASSERT(fIsBW);
+    fAA.setRegion(fBW);
+    fIsBW = false;
+}
+

src/core/SkRasterClip.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkRasterClip_DEFINED
+#define SkRasterClip_DEFINED
+
+#include "SkRegion.h"
+#include "SkAAClip.h"
+
+class SkRasterClip {
+public:
+    SkRasterClip();
+    SkRasterClip(const SkRasterClip&);
+    ~SkRasterClip();
+
+    bool isBW() const { return fIsBW; }
+    bool isAA() const { return !fIsBW; }
+
+    bool isEmpty() const;
+    bool isRect() const;
+    bool isComplex() const;
+    const SkIRect& getBounds() const;
+
+    bool setEmpty();
+    bool setIRect(const SkIRect&);
+
+    bool setPath(const SkPath& path, const SkRegion& clip, bool doAA);
+    bool setPath(const SkPath& path, const SkIRect& clip, bool doAA);
+    bool setPath(const SkPath& path, const SkRasterClip&, bool doAA);
+
+    bool op(const SkIRect&, SkRegion::Op);
+    bool op(const SkRasterClip&, SkRegion::Op);
+
+    const SkRegion& bwRgn() const { SkASSERT(fIsBW); return fBW; }
+    const SkAAClip& aaRgn() const { SkASSERT(!fIsBW); return fAA; }
+
+private:
+    SkRegion    fBW;
+    SkAAClip    fAA;
+    bool        fIsBW;
+
+    void convertToAA();
+};
+
+#endif