Alternate version of SkLocalMatrixImageFilter using an input.

src/core/SkLocalMatrixImageFilter.cpp

Index: src/core/SkLocalMatrixImageFilter.cpp
diff --git a/src/core/SkLocalMatrixImageFilter.cpp b/src/core/SkLocalMatrixImageFilter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..17ee1028a8fe66ccc26360cf2d0ba55b06e76534
--- /dev/null
+++ b/src/core/SkLocalMatrixImageFilter.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkLocalMatrixImageFilter.h"
+#include "SkReadBuffer.h"
+#include "SkString.h"
+
+SkImageFilter* SkLocalMatrixImageFilter::Create(const SkMatrix& localM, SkImageFilter* input) {
+    if (!input) {
+        return nullptr;
+    }
+    if (localM.getType() & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
+        return nullptr;
+    }
+    if (localM.isIdentity()) {
+        return SkRef(input);
+    }
+    return new SkLocalMatrixImageFilter(localM, input);
+}
+
+SkLocalMatrixImageFilter::SkLocalMatrixImageFilter(const SkMatrix& localM, SkImageFilter* input)
+  : INHERITED(1, &input), fLocalM(localM)
+{}
+
+SkFlattenable* SkLocalMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
+    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
+    SkMatrix lm;
+    buffer.readMatrix(&lm);
+    return SkLocalMatrixImageFilter::Create(lm, common.getInput(0));
+}
+
+void SkLocalMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
+    this->INHERITED::flatten(buffer);
+    buffer.writeMatrix(fLocalM);
+}
+
+bool SkLocalMatrixImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const Context& ctx,
+                                             SkBitmap* result, SkIPoint* offset) const {
+    Context localCtx(SkMatrix::Concat(ctx.ctm(), fLocalM), ctx.clipBounds(), ctx.cache());
+    return this->getInput(0)->filterImage(proxy, src, localCtx, result, offset);
+}
+
+bool SkLocalMatrixImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& matrix,
+                                              SkIRect* dst) const {
+    return this->getInput(0)->filterBounds(src, SkMatrix::Concat(matrix, fLocalM), dst);
+}
+
+#ifndef SK_IGNORE_TO_STRING
+void SkLocalMatrixImageFilter::toString(SkString* str) const {
+    str->append("SkLocalMatrixImageFilter: (");
+    str->append(")");
+}
+#endif