1 files changed, 151 insertions, 0 deletions
diff --git a/effects/SkBlurDrawLooper.cpp b/effects/SkBlurDrawLooper.cpp
new file mode 100644
index 00000000..9585214b
--- /dev/null
+++ b/effects/SkBlurDrawLooper.cpp
@@ -0,0 +1,151 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkBlurDrawLooper.h"
+#include "SkBlurMaskFilter.h"
+#include "SkCanvas.h"
+#include "SkColorFilter.h"
+#include "SkFlattenableBuffers.h"
+#include "SkMaskFilter.h"
+#include "SkPaint.h"
+#include "SkString.h"
+#include "SkStringUtils.h"
+
+SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy,
+                                   SkColor color, uint32_t flags)
+    : fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags), fState(kDone) {
+
+    SkASSERT(flags <= kAll_BlurFlag);
+    if (radius > 0) {
+        uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ?
+            SkBlurMaskFilter::kIgnoreTransform_BlurFlag :
+            SkBlurMaskFilter::kNone_BlurFlag;
+
+        blurFlags |= flags & kHighQuality_BlurFlag ?
+            SkBlurMaskFilter::kHighQuality_BlurFlag :
+            SkBlurMaskFilter::kNone_BlurFlag;
+
+        fBlur = SkBlurMaskFilter::Create(radius,
+                                         SkBlurMaskFilter::kNormal_BlurStyle,
+                                         blurFlags);
+    } else {
+        fBlur = NULL;
+    }
+
+    if (flags & kOverrideColor_BlurFlag) {
+        // Set alpha to 1 for the override since transparency will already
+        // be baked into the blurred mask.
+        SkColor opaqueColor = SkColorSetA(color, 255);
+        //The SrcIn xfer mode will multiply 'color' by the incoming alpha
+        fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor,
+                                                       SkXfermode::kSrcIn_Mode);
+    } else {
+        fColorFilter = NULL;
+    }
+}
+
+SkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer)
+: INHERITED(buffer) {
+
+    fDx = buffer.readScalar();
+    fDy = buffer.readScalar();
+    fBlurColor = buffer.readColor();
+    fBlur = buffer.readFlattenableT<SkMaskFilter>();
+    fColorFilter = buffer.readFlattenableT<SkColorFilter>();
+    fBlurFlags = buffer.readUInt() & kAll_BlurFlag;
+}
+
+SkBlurDrawLooper::~SkBlurDrawLooper() {
+    SkSafeUnref(fBlur);
+    SkSafeUnref(fColorFilter);
+}
+
+void SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) const {
+    this->INHERITED::flatten(buffer);
+    buffer.writeScalar(fDx);
+    buffer.writeScalar(fDy);
+    buffer.writeColor(fBlurColor);
+    buffer.writeFlattenable(fBlur);
+    buffer.writeFlattenable(fColorFilter);
+    buffer.writeUInt(fBlurFlags);
+}
+
+void SkBlurDrawLooper::init(SkCanvas*) {
+    fState = kBeforeEdge;
+}
+
+bool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) {
+    switch (fState) {
+        case kBeforeEdge:
+            // we do nothing if a maskfilter is already installed
+            if (paint->getMaskFilter()) {
+                fState = kDone;
+                return false;
+            }
+#ifdef SK_BUILD_FOR_ANDROID
+            SkColor blurColor;
+            blurColor = fBlurColor;
+            if (SkColorGetA(blurColor) == 255) {
+                blurColor = SkColorSetA(blurColor, paint->getAlpha());
+            }
+            paint->setColor(blurColor);
+#else
+            paint->setColor(fBlurColor);
+#endif
+            paint->setMaskFilter(fBlur);
+            paint->setColorFilter(fColorFilter);
+            canvas->save(SkCanvas::kMatrix_SaveFlag);
+            if (fBlurFlags & kIgnoreTransform_BlurFlag) {
+                SkMatrix transform(canvas->getTotalMatrix());
+                transform.postTranslate(fDx, fDy);
+                canvas->setMatrix(transform);
+            } else {
+                canvas->translate(fDx, fDy);
+            }
+            fState = kAfterEdge;
+            return true;
+        case kAfterEdge:
+            canvas->restore();
+            fState = kDone;
+            return true;
+        default:
+            SkASSERT(kDone == fState);
+            return false;
+    }
+}
+
+#ifdef SK_DEVELOPER
+void SkBlurDrawLooper::toString(SkString* str) const {
+    str->append("SkBlurDrawLooper: ");
+
+    str->append("dx: ");
+    str->appendScalar(fDx);
+
+    str->append(" dy: ");
+    str->appendScalar(fDy);
+
+    str->append(" color: ");
+    str->appendHex(fBlurColor);
+
+    str->append(" flags: (");
+    if (kNone_BlurFlag == fBlurFlags) {
+        str->append("None");
+    } else {
+        bool needsSeparator = false;
+        SkAddFlagToString(str, SkToBool(kIgnoreTransform_BlurFlag & fBlurFlags), "IgnoreTransform",
+                          &needsSeparator);
+        SkAddFlagToString(str, SkToBool(kOverrideColor_BlurFlag & fBlurFlags), "OverrideColor",
+                          &needsSeparator);
+        SkAddFlagToString(str, SkToBool(kHighQuality_BlurFlag & fBlurFlags), "HighQuality",
+                          &needsSeparator);
+    }
+    str->append(")");
+
+    // TODO: add optional "fBlurFilter->toString(str);" when SkMaskFilter::toString is added
+    // alternatively we could cache the radius in SkBlurDrawLooper and just add it here
+}
+#endif