e6f5d56231
BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2224163005 Review-Url: https://codereview.chromium.org/2224163005
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/*
|
|
* 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
|