Builder class for SkLayerDrawLooper.

src/effects/SkLayerDrawLooper.cpp

Index: src/effects/SkLayerDrawLooper.cpp
diff --git a/src/effects/SkLayerDrawLooper.cpp b/src/effects/SkLayerDrawLooper.cpp
index 449361edc03c60771bfd570efc5b79bbab2bc1e6..4bd4c40c81a30752791913c9fdeb4bfabce5098d 100644
--- a/src/effects/SkLayerDrawLooper.cpp
+++ b/src/effects/SkLayerDrawLooper.cpp
@@ -354,4 +354,71 @@ void SkLayerDrawLooper::toString(SkString* str) const {
         rec = rec->fNext;
     }
 }
+
+SkLayerDrawLooperBuilder::SkLayerDrawLooperBuilder()
+        : fRecs(NULL),
+          fTopRec(NULL),
+          fCount(0) {
+}
+
+SkLayerDrawLooperBuilder::~SkLayerDrawLooperBuilder() {
+    SkLayerDrawLooper::Rec* rec = fRecs;
+    while (rec) {
+        SkLayerDrawLooper::Rec* next = rec->fNext;
+        SkDELETE(rec);
+        rec = next;
+    }
+}
+
+SkPaint* SkLayerDrawLooperBuilder::addLayer(
+        const SkLayerDrawLooper::LayerInfo& info) {
+    fCount += 1;
+
+    SkLayerDrawLooper::Rec* rec = SkNEW(SkLayerDrawLooper::Rec);
+    rec->fNext = fRecs;
+    rec->fInfo = info;
+    fRecs = rec;
+    if (NULL == fTopRec) {
+        fTopRec = rec;
+    }
+
+    return &rec->fPaint;
+}
+
+void SkLayerDrawLooperBuilder::addLayer(SkScalar dx, SkScalar dy) {
+    SkLayerDrawLooper::LayerInfo info;
+
+    info.fOffset.set(dx, dy);
+    (void)this->addLayer(info);
+}
+
+SkPaint* SkLayerDrawLooperBuilder::addLayerOnTop(
+        const SkLayerDrawLooper::LayerInfo& info) {
+    fCount += 1;
+
+    SkLayerDrawLooper::Rec* rec = SkNEW(SkLayerDrawLooper::Rec);
+    rec->fNext = NULL;
+    rec->fInfo = info;
+    if (NULL == fRecs) {
+        fRecs = rec;
+    } else {
+        SkASSERT(NULL != fTopRec);
+        fTopRec->fNext = rec;
+    }
+    fTopRec = rec;
+
+    return &rec->fPaint;
+}
+
+SkDrawLooper* SkLayerDrawLooperBuilder::createLooper() {
+    SkLayerDrawLooper* looper = SkNEW(SkLayerDrawLooper);
+    looper->fCount = fCount;
+    looper->fRecs = fRecs;
+
+    fCount = 0;
+    fRecs = NULL;
+    fTopRec = NULL;
+
+    return looper;
+}
 #endif