The Tor Browser: gfx/skia/trunk/src/gpu/effects/Gr1DKernelEffect.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright 2012 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  */

     8 #ifndef Gr1DKernelEffect_DEFINED

     9 #define Gr1DKernelEffect_DEFINED

    11 #include "GrSingleTextureEffect.h"

    12 #include "SkMatrix.h"

    14 /**

    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.

    21  */

    23 class Gr1DKernelEffect : public GrSingleTextureEffect {

    25 public:

    26     enum Direction {

    27         kX_Direction,

    28         kY_Direction,

    29     };

    31     Gr1DKernelEffect(GrTexture* texture,

    32                      Direction direction,

    33                      int radius)

    34         : GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture))

    35         , fDirection(direction)

    36         , fRadius(radius) {}

    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; }

    46 private:

    48     Direction       fDirection;

    49     int             fRadius;

    51     typedef GrSingleTextureEffect INHERITED;

    52 };

    54 #endif

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