1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/effects/GrSingleTextureEffect.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,67 @@
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 GrSingleTextureEffect_DEFINED
1.12 +#define GrSingleTextureEffect_DEFINED
1.13 +
1.14 +#include "GrEffect.h"
1.15 +#include "SkMatrix.h"
1.16 +#include "GrCoordTransform.h"
1.17 +
1.18 +class GrTexture;
1.19 +
1.20 +/**
1.21 + * A base class for effects that draw a single texture with a texture matrix. This effect has no
1.22 + * backend implementations. One must be provided by the subclass.
1.23 + */
1.24 +class GrSingleTextureEffect : public GrEffect {
1.25 +public:
1.26 + virtual ~GrSingleTextureEffect();
1.27 +
1.28 +protected:
1.29 + /** unfiltered, clamp mode */
1.30 + GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrCoordSet = kLocal_GrCoordSet);
1.31 + /** clamp mode */
1.32 + GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrTextureParams::FilterMode filterMode,
1.33 + GrCoordSet = kLocal_GrCoordSet);
1.34 + GrSingleTextureEffect(GrTexture*,
1.35 + const SkMatrix&,
1.36 + const GrTextureParams&,
1.37 + GrCoordSet = kLocal_GrCoordSet);
1.38 +
1.39 + /**
1.40 + * Helper for subclass onIsEqual() functions.
1.41 + */
1.42 + bool hasSameTextureParamsMatrixAndSourceCoords(const GrSingleTextureEffect& other) const {
1.43 + // We don't have to check the accesses' swizzles because they are inferred from the texture.
1.44 + return fTextureAccess == other.fTextureAccess &&
1.45 + fCoordTransform.getMatrix().cheapEqualTo(other.fCoordTransform.getMatrix()) &&
1.46 + fCoordTransform.sourceCoords() == other.fCoordTransform.sourceCoords();
1.47 + }
1.48 +
1.49 + /**
1.50 + * Can be used as a helper to implement subclass getConstantColorComponents(). It assumes that
1.51 + * the subclass output color will be a modulation of the input color with a value read from the
1.52 + * texture.
1.53 + */
1.54 + void updateConstantColorComponentsForModulation(GrColor* color, uint32_t* validFlags) const {
1.55 + if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
1.56 + GrPixelConfigIsOpaque(this->texture(0)->config())) {
1.57 + *validFlags = kA_GrColorComponentFlag;
1.58 + } else {
1.59 + *validFlags = 0;
1.60 + }
1.61 + }
1.62 +
1.63 +private:
1.64 + GrCoordTransform fCoordTransform;
1.65 + GrTextureAccess fTextureAccess;
1.66 +
1.67 + typedef GrEffect INHERITED;
1.68 +};
1.69 +
1.70 +#endif
