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