Make texture domain a helper so that it can be incorporated into other effects.

src/gpu/effects/GrTextureDomainEffect.h

Index: src/gpu/effects/GrTextureDomainEffect.h
diff --git a/src/gpu/effects/GrTextureDomainEffect.h b/src/gpu/effects/GrTextureDomainEffect.h
deleted file mode 100644
index 46ee2a6506689d7d7e48841b470eef501281133f..0000000000000000000000000000000000000000
--- a/src/gpu/effects/GrTextureDomainEffect.h
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrTextureDomainEffect_DEFINED
-#define GrTextureDomainEffect_DEFINED
-
-#include "GrSingleTextureEffect.h"
-
-class GrGLTextureDomainEffect;
-struct SkRect;
-
-/**
- * Limits a texture's lookup coordinates to a domain. Samples outside the domain are either clamped
- * the edge of the domain or result in a vec4 of zeros. The domain is clipped to normalized texture
- * coords ([0,1]x[0,1] square). Bilinear filtering can cause texels outside the domain to affect the
- * read value unless the caller considers this when calculating the domain. TODO: This should be a
- * helper that can assist an effect rather than effect unto itself.
- */
-class GrTextureDomainEffect : public GrSingleTextureEffect {
-
-public:
-    /**
-     * If SkShader::kDecal_TileMode sticks then this enum could be replaced by SkShader::TileMode.
-     * We could also consider replacing/augmenting Decal mode with Border mode where the color
-     * outside of the domain is user-specifiable. Decal mode currently has a hard (non-lerped)
-     * transition between the border and the interior.
-     */
-    enum WrapMode {
-        kClamp_WrapMode,
-        kDecal_WrapMode,
-    };
-
-    static GrEffectRef* Create(GrTexture*,
-                               const SkMatrix&,
-                               const SkRect& domain,
-                               WrapMode,
-                               GrTextureParams::FilterMode filterMode,
-                               GrCoordSet = kLocal_GrCoordSet);
-
-    virtual ~GrTextureDomainEffect();
-
-    static const char* Name() { return "TextureDomain"; }
-
-    typedef GrGLTextureDomainEffect GLEffect;
-
-    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
-    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
-
-    const SkRect& domain() const { return fTextureDomain; }
-    WrapMode wrapMode() const { return fWrapMode; }
-
-    /* Computes a domain that bounds all the texels in texelRect. Note that with bilerp enabled
-       texels neighboring the domain may be read. */
-    static const SkRect MakeTexelDomain(const GrTexture* texture, const SkIRect& texelRect) {
-        SkScalar wInv = SK_Scalar1 / texture->width();
-        SkScalar hInv = SK_Scalar1 / texture->height();
-        SkRect result = {
-            texelRect.fLeft * wInv,
-            texelRect.fTop * hInv,
-            texelRect.fRight * wInv,
-            texelRect.fBottom * hInv
-        };
-        return result;
-    }
-
-protected:
-    WrapMode fWrapMode;
-    SkRect   fTextureDomain;
-
-private:
-    GrTextureDomainEffect(GrTexture*,
-                          const SkMatrix&,
-                          const SkRect& domain,
-                          WrapMode,
-                          GrTextureParams::FilterMode filterMode,
-                          GrCoordSet);
-
-    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
-
-    GR_DECLARE_EFFECT_TEST;
-
-    typedef GrSingleTextureEffect INHERITED;
-};
-
-#endif