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| 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 |
| 12 #include "GrDrawContext.h" |
| 13 |
| 14 class GrContext; |
| 15 class GrTexture; |
| 16 |
| 17 struct SkRect; |
| 18 |
| 19 namespace SkGpuBlurUtils { |
| 20 /** |
| 21 * Applies a 2D Gaussian blur to a given texture. The blurred result is retur
ned |
| 22 * as a drawContext in case the caller wishes to future draw into the result. |
| 23 * Note: one of sigmaX and sigmaY should be non-zero! |
| 24 * @param context The GPU context |
| 25 * @param srcTexture The source texture to be blurred. |
| 26 * @param colorSpace Color space of the source (used for the drawContext
result, too). |
| 27 * @param dstBounds The destination bounds, relative to the source text
ure. |
| 28 * @param srcBounds The source bounds, relative to the source texture.
If non-null, |
| 29 * no pixels will be sampled outside of this rectangle
. |
| 30 * @param sigmaX The blur's standard deviation in X. |
| 31 * @param sigmaY The blur's standard deviation in Y. |
| 32 * @param fit backing fit for the returned draw context |
| 33 * @return The drawContext containing the blurred result. |
| 34 */ |
| 35 sk_sp<GrDrawContext> GaussianBlur(GrContext* context, |
| 36 GrTexture* srcTexture, |
| 37 sk_sp<SkColorSpace> colorSpace, |
| 38 const SkIRect& dstBounds, |
| 39 const SkIRect* srcBounds, |
| 40 float sigmaX, |
| 41 float sigmaY, |
| 42 SkBackingFit fit = SkBackingFit::kApprox); |
| 43 }; |
| 44 |
| 45 #endif |
| 46 #endif |
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