michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef SkGpuBlurUtils_DEFINED
michael@0: #define SkGpuBlurUtils_DEFINED
michael@0: 
michael@0: #if SK_SUPPORT_GPU
michael@0: class GrTexture;
michael@0: class GrContext;
michael@0: #endif
michael@0: 
michael@0: struct SkRect;
michael@0: 
michael@0: namespace SkGpuBlurUtils {
michael@0: 
michael@0: #if SK_SUPPORT_GPU
michael@0:   /**
michael@0:     * Applies a 2D Gaussian blur to a given texture.
michael@0:     * @param context         The GPU context
michael@0:     * @param srcTexture      The source texture to be blurred.
michael@0:     * @param canClobberSrc   If true, srcTexture may be overwritten, and
michael@0:     *                        may be returned as the result.
michael@0:     * @param rect            The destination rectangle.
michael@0:     * @param cropToRect      If true, do not sample any pixels outside the
michael@0:     *                        source rect.
michael@0:     * @param sigmaX          The blur's standard deviation in X.
michael@0:     * @param sigmaY          The blur's standard deviation in Y.
michael@0:     * @return the blurred texture, which may be srcTexture reffed, or a
michael@0:     * new texture.  It is the caller's responsibility to unref this texture.
michael@0:     */
michael@0:     GrTexture* GaussianBlur(GrContext* context,
michael@0:                             GrTexture* srcTexture,
michael@0:                             bool canClobberSrc,
michael@0:                             const SkRect& rect,
michael@0:                             bool cropToRect,
michael@0:                             float sigmaX,
michael@0:                             float sigmaY);
michael@0: #endif
michael@0: 
michael@0: };
michael@0: 
michael@0: #endif