2 * Copyright 2012 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef Gr1DKernelEffect_DEFINED
9 #define Gr1DKernelEffect_DEFINED
11 #include "GrSingleTextureEffect.h"
15 * Base class for 1D kernel effects. The kernel operates either in X or Y and
16 * has a pixel radius. The kernel is specified in the src texture's space
17 * and the kernel center is pinned to a texel's center. The radius specifies
18 * the number of texels on either side of the center texel in X or Y that are
19 * read. Since the center pixel is also read, the total width is one larger than
20 * two times the radius.
23 class Gr1DKernelEffect : public GrSingleTextureEffect {
31 Gr1DKernelEffect(GrTexture* texture,
34 : GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture))
35 , fDirection(direction)
38 virtual ~Gr1DKernelEffect() {};
40 static int WidthFromRadius(int radius) { return 2 * radius + 1; }
42 int radius() const { return fRadius; }
43 int width() const { return WidthFromRadius(fRadius); }
44 Direction direction() const { return fDirection; }
51 typedef GrSingleTextureEffect INHERITED;