1 files changed, 39 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/core/SkMatrixUtils.h b/gfx/skia/skia/src/core/SkMatrixUtils.h
new file mode 100644
index 0000000000..e6a9003bed
--- /dev/null
+++ b/gfx/skia/skia/src/core/SkMatrixUtils.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMatrixUtils_DEFINED
+#define SkMatrixUtils_DEFINED
+
+#include "include/core/SkPoint.h"
+#include "include/core/SkSize.h"
+
+class SkMatrix;
+struct SkSamplingOptions;
+
+/**
+ *  Given a matrix, size and an antialias setting, return true if the computed dst-rect
+ *  would align such that there is a 1-to-1 coorspondence between src and dst pixels.
+ *  This can be called by drawing code to see if drawBitmap can be turned into
+ *  drawSprite (which is faster).
+ *
+ *  The src-rect is defined to be { 0, 0, size.width(), size.height() }
+ */
+bool SkTreatAsSprite(const SkMatrix&, const SkISize& size, const SkSamplingOptions&,
+                     bool isAntiAlias);
+
+/** Decomposes the upper-left 2x2 of the matrix into a rotation (represented by
+    the cosine and sine of the rotation angle), followed by a non-uniform scale,
+    followed by another rotation. If there is a reflection, one of the scale
+    factors will be negative.
+    Returns true if successful. Returns false if the matrix is degenerate.
+    */
+bool SkDecomposeUpper2x2(const SkMatrix& matrix,
+                         SkPoint* rotation1,
+                         SkPoint* scale,
+                         SkPoint* rotation2);
+
+#endif