| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef SkShadowParams_DEFINED |
| #define SkShadowParams_DEFINED |
| |
| /** \struct SkShadowParams |
| |
| This struct holds information needed for drawing shadows. |
| |
| fShadowRadius - radius of the shadow blur |
| |
| fBiasingConstant - A constant used in variance shadow mapping to directly |
| 0.0 - 1.0 reduce light bleeding. Essentially sets all shadows |
| ~.25 below a certain brightness equal to no light, and does |
| a linear step on the rest. Essentially makes shadows |
| darker and more rounded at higher values. |
| |
| fMinVariance - Too low of a variance (near the outer edges of blurry |
| ~512, 1024 shadows) will lead to ugly sharp shadow brightness |
| distortions. This enforces a minimum amount of variance |
| in the calculation to smooth out the outside edges of |
| blurry shadows. However, too high of a value for this will |
| cause all shadows to be lighter by visibly different |
| amounts varying on depth. |
| |
| fType - Decides which algorithm to use to draw shadows. |
| */ |
| struct SkShadowParams { |
| SkScalar fShadowRadius; |
| SkScalar fBiasingConstant; |
| SkScalar fMinVariance; |
| |
| enum ShadowType { |
| kNoBlur_ShadowType, |
| kVariance_ShadowType, |
| |
| kLast_ShadowType = kVariance_ShadowType |
| }; |
| static const int kShadowTypeCount = kLast_ShadowType + 1; |
| |
| ShadowType fType; |
| }; |
| |
| #endif |