New drop of Skia. This is up to CL 121320.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@6925 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 130 insertions, 0 deletions

diff --git a/skia/effects/SkLayerDrawLooper.cpp b/skia/effects/SkLayerDrawLooper.cpp
new file mode 100644
index 0000000..f2d8ba8
--- /dev/null
+++ b/skia/effects/SkLayerDrawLooper.cpp
@@ -0,0 +1,130 @@
+#include "SkCanvas.h"
+#include "SkLayerDrawLooper.h"
+#include "SkPaint.h"
+
+SkLayerDrawLooper::SkLayerDrawLooper() {
+    fRecs = NULL;
+    fCount = 0;
+}
+
+SkLayerDrawLooper::~SkLayerDrawLooper() {
+    Rec* rec = fRecs;
+    while (rec) {
+        Rec* next = rec->fNext;
+        SkDELETE(rec);
+        rec = next;
+    }
+}
+    
+SkPaint* SkLayerDrawLooper::addLayer(SkScalar dx, SkScalar dy) {
+    fCount += 1;
+
+    Rec* rec = SkNEW(Rec);
+    rec->fNext = fRecs;
+    rec->fOffset.set(dx, dy);
+    fRecs = rec;
+
+    return &rec->fPaint;
+}
+
+void SkLayerDrawLooper::init(SkCanvas* canvas, SkPaint* paint) {
+    fIter.fSavedPaint = *paint;
+    fIter.fPaint = paint;
+    fIter.fCanvas = canvas;
+    fIter.fRec = fRecs;
+    canvas->save(SkCanvas::kMatrix_SaveFlag);
+}
+
+bool SkLayerDrawLooper::next() {
+    Rec* rec = fIter.fRec;
+    if (rec) {
+        *fIter.fPaint = rec->fPaint;
+        fIter.fCanvas->restore();
+        fIter.fCanvas->save(SkCanvas::kMatrix_SaveFlag);
+        fIter.fCanvas->translate(rec->fOffset.fX, rec->fOffset.fY);
+
+        fIter.fRec = rec->fNext;
+        return true;
+    }
+    return false;
+}
+
+void SkLayerDrawLooper::restore() {
+    fIter.fCanvas->restore();
+    *fIter.fPaint = fIter.fSavedPaint;
+}
+
+SkLayerDrawLooper::Rec* SkLayerDrawLooper::Rec::Reverse(Rec* head) {
+    Rec* rec = head;
+    Rec* prev = NULL;
+    while (rec) {
+        Rec* next = rec->fNext;
+        rec->fNext = prev;
+        prev = rec;
+        rec = next;
+    }
+    return prev;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void SkLayerDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) {
+    this->INHERITED::flatten(buffer);
+
+#ifdef SK_DEBUG
+    {
+        Rec* rec = fRecs;
+        int count = 0;
+        while (rec) {
+            rec = rec->fNext;
+            count += 1;
+        }
+        SkASSERT(count == fCount);
+    }
+#endif
+
+    buffer.writeInt(fCount);
+    
+    Rec* rec = fRecs;
+    for (int i = 0; i < fCount; i++) {
+        buffer.writeScalar(rec->fOffset.fX);
+        buffer.writeScalar(rec->fOffset.fY);
+        rec->fPaint.flatten(buffer);
+        rec = rec->fNext;
+    }
+}
+
+SkLayerDrawLooper::SkLayerDrawLooper(SkFlattenableReadBuffer& buffer)
+        : INHERITED(buffer) {
+    fRecs = NULL;
+    fCount = 0;
+    
+    int count = buffer.readInt();
+
+    for (int i = 0; i < count; i++) {
+        SkScalar dx = buffer.readScalar();
+        SkScalar dy = buffer.readScalar();
+        this->addLayer(dx, dy)->unflatten(buffer);
+    }
+    SkASSERT(count == fCount);
+
+    // we're in reverse order, so fix it now
+    fRecs = Rec::Reverse(fRecs);
+    
+#ifdef SK_DEBUG
+    {
+        Rec* rec = fRecs;
+        int n = 0;
+        while (rec) {
+            rec = rec->fNext;
+            n += 1;
+        }
+        SkASSERT(count == n);
+    }
+#endif
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkFlattenable::Registrar gReg("SkLayerDrawLooper",
+                                     SkLayerDrawLooper::CreateProc);