/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkLightingShader_DEFINED
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#define SkLightingShader_DEFINED
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#include "SkLights.h"
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#include "SkShader.h"
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class SkBitmap;
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class SkMatrix;
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class SkNormalSource;
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class SkLightingShader {
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public:
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/** Returns a shader that lights the shape, colored by the diffuseShader, using the
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normals from normalSource, with the set of lights provided.
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@param diffuseShader the shader that provides the colors. If nullptr, uses the paint's
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color.
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@param normalSource the source for the shape's normals. If nullptr, assumes straight
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up normals (<0,0,1>).
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@param lights the lights applied to the normals
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The lighting equation is currently:
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result = (LightColor * dot(Normal, LightDir) + AmbientColor) * DiffuseColor
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*/
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static sk_sp<SkShader> Make(sk_sp<SkShader> diffuseShader, sk_sp<SkNormalSource> normalSource,
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sk_sp<SkLights> lights);
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static void RegisterFlattenables();
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};
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#endif
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