1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/effects/Gr1DKernelEffect.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,54 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef Gr1DKernelEffect_DEFINED
1.12 +#define Gr1DKernelEffect_DEFINED
1.13 +
1.14 +#include "GrSingleTextureEffect.h"
1.15 +#include "SkMatrix.h"
1.16 +
1.17 +/**
1.18 + * Base class for 1D kernel effects. The kernel operates either in X or Y and
1.19 + * has a pixel radius. The kernel is specified in the src texture's space
1.20 + * and the kernel center is pinned to a texel's center. The radius specifies
1.21 + * the number of texels on either side of the center texel in X or Y that are
1.22 + * read. Since the center pixel is also read, the total width is one larger than
1.23 + * two times the radius.
1.24 + */
1.25 +
1.26 +class Gr1DKernelEffect : public GrSingleTextureEffect {
1.27 +
1.28 +public:
1.29 + enum Direction {
1.30 + kX_Direction,
1.31 + kY_Direction,
1.32 + };
1.33 +
1.34 + Gr1DKernelEffect(GrTexture* texture,
1.35 + Direction direction,
1.36 + int radius)
1.37 + : GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture))
1.38 + , fDirection(direction)
1.39 + , fRadius(radius) {}
1.40 +
1.41 + virtual ~Gr1DKernelEffect() {};
1.42 +
1.43 + static int WidthFromRadius(int radius) { return 2 * radius + 1; }
1.44 +
1.45 + int radius() const { return fRadius; }
1.46 + int width() const { return WidthFromRadius(fRadius); }
1.47 + Direction direction() const { return fDirection; }
1.48 +
1.49 +private:
1.50 +
1.51 + Direction fDirection;
1.52 + int fRadius;
1.53 +
1.54 + typedef GrSingleTextureEffect INHERITED;
1.55 +};
1.56 +
1.57 +#endif
