1 files changed, 86 insertions, 0 deletions
diff --git a/skia/effects/SkBlurDrawLooper.cpp b/skia/effects/SkBlurDrawLooper.cpp
new file mode 100644
index 0000000..61b69eb
--- /dev/null
+++ b/skia/effects/SkBlurDrawLooper.cpp
@@ -0,0 +1,86 @@
+#include "SkBlurDrawLooper.h"
+#include "SkBlurMaskFilter.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkMaskFilter.h"
+
+SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy,
+                                   SkColor color)
+    : fDx(dx), fDy(dy), fBlurColor(color)
+{
+    if (radius > 0)
+        fBlur = SkBlurMaskFilter::Create(radius,
+                                         SkBlurMaskFilter::kNormal_BlurStyle);
+    else
+        fBlur = NULL;
+}
+
+SkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer)
+{
+    fDx = buffer.readScalar();
+    fDy = buffer.readScalar();
+    fBlurColor = buffer.readU32();
+    fBlur = static_cast<SkMaskFilter*>(buffer.readFlattenable());
+}
+
+SkBlurDrawLooper::~SkBlurDrawLooper()
+{
+    fBlur->safeUnref();
+}
+
+void SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer)
+{
+    buffer.writeScalar(fDx);
+    buffer.writeScalar(fDy);
+    buffer.write32(fBlurColor);
+    buffer.writeFlattenable(fBlur);
+}
+
+void SkBlurDrawLooper::init(SkCanvas* canvas, SkPaint* paint)
+{
+    // we do nothing if a maskfilter is already installed
+    if (paint->getMaskFilter() != NULL)
+        fState = kDone;
+    else
+    {
+        fState = kBeforeEdge;
+        fPaint = paint;
+        fCanvas = canvas;
+        fSaveCount = canvas->getSaveCount();
+    }
+}
+
+bool SkBlurDrawLooper::next()
+{
+    switch (fState) {
+    case kBeforeEdge:
+        fSavedColor = fPaint->getColor();
+        fPaint->setColor(fBlurColor);
+        fPaint->setMaskFilter(fBlur);
+        fCanvas->save(SkCanvas::kMatrix_SaveFlag);
+        fCanvas->translate(fDx, fDy);
+        fState = kAfterEdge;
+        return true;
+    case kAfterEdge:
+        fPaint->setColor(fSavedColor);
+        fPaint->setMaskFilter(NULL);
+        fCanvas->restore(); // to remove the translate we did earlier
+        fState = kDone;
+        return true;
+    default:
+        SkASSERT(kDone == fState);
+        return false;
+    }
+}
+
+void SkBlurDrawLooper::restore()
+{
+    if (kAfterEdge == fState)
+    {
+        fPaint->setColor(fSavedColor);
+        fPaint->setMaskFilter(NULL);
+        fCanvas->restore(); // to remove the translate we did earlier
+        fState = kDone;
+    }
+}
+