/src/skia/src/core/SkDrawShadowInfo.h
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1 | | /* |
2 | | * Copyright 2017 Google Inc. |
3 | | * |
4 | | * Use of this source code is governed by a BSD-style license that can be |
5 | | * found in the LICENSE file. |
6 | | */ |
7 | | |
8 | | #ifndef SkDrawShadowInfo_DEFINED |
9 | | #define SkDrawShadowInfo_DEFINED |
10 | | |
11 | | #include "include/core/SkColor.h" |
12 | | #include "include/core/SkPoint.h" |
13 | | #include "include/core/SkPoint3.h" |
14 | | #include "include/private/SkTPin.h" |
15 | | |
16 | | class SkMatrix; |
17 | | class SkPath; |
18 | | struct SkRect; |
19 | | |
20 | | struct SkDrawShadowRec { |
21 | | SkPoint3 fZPlaneParams; |
22 | | SkPoint3 fLightPos; |
23 | | SkScalar fLightRadius; |
24 | | SkColor fAmbientColor; |
25 | | SkColor fSpotColor; |
26 | | uint32_t fFlags; |
27 | | }; |
28 | | |
29 | | namespace SkDrawShadowMetrics { |
30 | | |
31 | | static constexpr auto kAmbientHeightFactor = 1.0f / 128.0f; |
32 | | static constexpr auto kAmbientGeomFactor = 64.0f; |
33 | | // Assuming that we have a light height of 600 for the spot shadow, |
34 | | // the spot values will reach their maximum at a height of approximately 292.3077. |
35 | | // We'll round up to 300 to keep it simple. |
36 | | static constexpr auto kMaxAmbientRadius = 300*kAmbientHeightFactor*kAmbientGeomFactor; |
37 | | |
38 | 0 | static inline float divide_and_pin(float numer, float denom, float min, float max) { |
39 | 0 | float result = SkTPin(sk_ieee_float_divide(numer, denom), min, max); |
40 | | // ensure that SkTPin handled non-finites correctly |
41 | 0 | SkASSERT(result >= min && result <= max); |
42 | 0 | return result; |
43 | 0 | } Unexecuted instantiation: SkPictureRecorder.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkRecordedDrawable.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkRecorder.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkShadowUtils.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkGlobalInitialization_default.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: Device.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SurfaceDrawContext.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkDrawShadowInfo.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkMiniRecorder.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkRecord.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkRecordDraw.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkRecordOpts.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkRecords.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkBigPicture.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkPicture.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkPicturePlayback.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkPictureRecord.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkShadowTessellator.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkShadowUtils.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SurfaceDrawContext.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: SkDrawShadowInfo.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: FuzzCanvas.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: DebugCanvas.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: DebugLayerManager.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: DrawCommand.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) Unexecuted instantiation: JsonWriteBuffer.cpp:SkDrawShadowMetrics::divide_and_pin(float, float, float, float) |
44 | | |
45 | 0 | inline SkScalar AmbientBlurRadius(SkScalar height) { |
46 | 0 | return std::min(height*kAmbientHeightFactor*kAmbientGeomFactor, kMaxAmbientRadius); |
47 | 0 | } |
48 | | |
49 | 0 | inline SkScalar AmbientRecipAlpha(SkScalar height) { |
50 | 0 | return 1.0f + std::max(height*kAmbientHeightFactor, 0.0f); |
51 | 0 | } |
52 | | |
53 | 0 | inline SkScalar SpotBlurRadius(SkScalar occluderZ, SkScalar lightZ, SkScalar lightRadius) { |
54 | 0 | return lightRadius*divide_and_pin(occluderZ, lightZ - occluderZ, 0.0f, 0.95f); |
55 | 0 | } |
56 | | |
57 | | inline void GetSpotParams(SkScalar occluderZ, SkScalar lightX, SkScalar lightY, SkScalar lightZ, |
58 | | SkScalar lightRadius, |
59 | 0 | SkScalar* blurRadius, SkScalar* scale, SkVector* translate) { |
60 | 0 | SkScalar zRatio = divide_and_pin(occluderZ, lightZ - occluderZ, 0.0f, 0.95f); |
61 | 0 | *blurRadius = lightRadius*zRatio; |
62 | 0 | *scale = divide_and_pin(lightZ, lightZ - occluderZ, 1.0f, 1.95f); |
63 | 0 | *translate = SkVector::Make(-zRatio * lightX, -zRatio * lightY); |
64 | 0 | } |
65 | | |
66 | | inline void GetDirectionalParams(SkScalar occluderZ, SkScalar lightX, SkScalar lightY, |
67 | | SkScalar lightZ, SkScalar lightRadius, |
68 | 0 | SkScalar* blurRadius, SkScalar* scale, SkVector* translate) { |
69 | 0 | *blurRadius = lightRadius*occluderZ; |
70 | 0 | *scale = 1; |
71 | | // Max z-ratio is "max expected elevation"/"min allowable z" |
72 | 0 | constexpr SkScalar kMaxZRatio = 64/SK_ScalarNearlyZero; |
73 | 0 | SkScalar zRatio = divide_and_pin(occluderZ, lightZ, 0.0f, kMaxZRatio); |
74 | 0 | *translate = SkVector::Make(-zRatio * lightX, -zRatio * lightY); |
75 | 0 | } |
76 | | |
77 | | // Create the transformation to apply to a path to get its base shadow outline, given the light |
78 | | // parameters and the path's 3D transformation (given by ctm and zPlaneParams). |
79 | | // Also computes the blur radius to apply the transformed outline. |
80 | | bool GetSpotShadowTransform(const SkPoint3& lightPos, SkScalar lightRadius, |
81 | | const SkMatrix& ctm, const SkPoint3& zPlaneParams, |
82 | | const SkRect& pathBounds, bool directional, |
83 | | SkMatrix* shadowTransform, SkScalar* radius); |
84 | | |
85 | | // get bounds prior to the ctm being applied |
86 | | void GetLocalBounds(const SkPath&, const SkDrawShadowRec&, const SkMatrix& ctm, SkRect* bounds); |
87 | | |
88 | | } // namespace SkDrawShadowMetrics |
89 | | |
90 | | #endif |