1/*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkGpuBlurUtils_DEFINED
9#define SkGpuBlurUtils_DEFINED
10
11#if SK_SUPPORT_GPU
12class GrTexture;
13class GrContext;
14#endif
15
16struct SkRect;
17
18namespace SkGpuBlurUtils {
19
20#if SK_SUPPORT_GPU
21  /**
22    * Applies a 2D Gaussian blur to a given texture.
23    * @param context         The GPU context
24    * @param srcTexture      The source texture to be blurred.
25    * @param canClobberSrc   If true, srcTexture may be overwritten, and
26    *                        may be returned as the result.
27    * @param rect            The destination rectangle.
28    * @param cropToRect      If true, do not sample any pixels outside the
29    *                        source rect.
30    * @param sigmaX          The blur's standard deviation in X.
31    * @param sigmaY          The blur's standard deviation in Y.
32    * @return the blurred texture, which may be srcTexture reffed, or a
33    * new texture.  It is the caller's responsibility to unref this texture.
34    */
35    GrTexture* GaussianBlur(GrContext* context,
36                            GrTexture* srcTexture,
37                            bool canClobberSrc,
38                            const SkRect& rect,
39                            bool cropToRect,
40                            float sigmaX,
41                            float sigmaY);
42#endif
43
44};
45
46#endif
47