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1 /* | 1 /* |
2 * Copyright 2016 Google Inc. | 2 * Copyright 2016 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkNormalSource_DEFINED | 8 #ifndef SkNormalSource_DEFINED |
9 #define SkNormalSource_DEFINED | 9 #define SkNormalSource_DEFINED |
10 | 10 |
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61 is retrieved by: | 61 is retrieved by: |
62 N.x = R-127; | 62 N.x = R-127; |
63 N.y = G-127; | 63 N.y = G-127; |
64 N.z = B-127; | 64 N.z = B-127; |
65 N.normalize(); | 65 N.normalize(); |
66 The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is | 66 The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is |
67 (127, 127, 0). | 67 (127, 127, 0). |
68 */ | 68 */ |
69 static sk_sp<SkNormalSource> MakeFromNormalMap(sk_sp<SkShader> map, const Sk Matrix& ctm); | 69 static sk_sp<SkNormalSource> MakeFromNormalMap(sk_sp<SkShader> map, const Sk Matrix& ctm); |
70 | 70 |
71 /** Returns a normal source that provides straight-up normals only (0, 0, 1) . | 71 /** Returns a normal source that provides straight-up normals only <0, 0, 1> . |
72 */ | 72 */ |
73 static sk_sp<SkNormalSource> MakeFlat(); | 73 static sk_sp<SkNormalSource> MakeFlat(); |
74 | 74 |
75 /** This enum specifies the shape of the bevel. All bevels output <0, 0, 1> as the surface | 75 /** This enum specifies the shape of the bevel. All bevels output <0, 0, 1> as the surface |
76 * normal for any point more than 'width' away from any edge. | 76 * normal for any point more than 'width' away from any edge. |
77 * | 77 * |
78 * Mathematical details: | 78 * Mathematical details: |
79 * For the purpose of describing the shape of the bevel, we define 'w' to b e the given width of | 79 * For the purpose of describing the shape of the bevel, we define 'w' to b e the given width of |
80 * the bevel, and 'h' to be the given height. We will assume the shape is r otated such that the | 80 * the bevel, and 'h' to be the given height. We will assume the shape is r otated such that the |
81 * point being shaded as well as the closest point in the shape's edge to t hat point are in the | 81 * point being shaded as well as the closest point in the shape's edge to t hat point are in the |
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101 /* This bevel simulates a surface that sharply becomes perpendicular to the x-y plane when | 101 /* This bevel simulates a surface that sharply becomes perpendicular to the x-y plane when |
102 * at 'width' units from the nearest edge, and then rounds off towards t he shape's | 102 * at 'width' units from the nearest edge, and then rounds off towards t he shape's |
103 * edge, smoothly becoming parallel to the x-y plane. | 103 * edge, smoothly becoming parallel to the x-y plane. |
104 * | 104 * |
105 * Mathematical details: | 105 * Mathematical details: |
106 * This bevel follows the only quadratic bezier curve whose start point is at (w, 0, 0), | 106 * This bevel follows the only quadratic bezier curve whose start point is at (w, 0, 0), |
107 * control point is at (0, 0, 0), and end point is at (0, 0, h). | 107 * control point is at (0, 0, 0), and end point is at (0, 0, h). |
108 */ | 108 */ |
109 kRoundedIn | 109 kRoundedIn |
110 }; | 110 }; |
111 /** Returns a normal source that generates a bevel for the given shape. UNIM PLEMENTED: Will | 111 /** Returns a normal source that generates a bevel for the shape being drawn . This normal source |
112 return straight-up normals only. | 112 works only for shapes whose geometry processors implement distance vecto rs (as of 2016-08-11 |
egdaniel
2016/08/11 20:21:02
After the first sentence, I would say "Currently t
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113 only anti-aliased rectangles and circles do this). It is also only imple mented in the GPU | |
114 backend, so rendering must happen on the GPU for this effect to work cor rectly. | |
113 | 115 |
114 @param type the type of bevel to add. | 116 @param type the type of bevel to add. |
115 @param width the width of the bevel, in source space. Must be positive . | 117 @param width the width of the bevel, in source space. Must be positive . |
116 @param height the height of the plateau, in source space. Can be positi ve, negative, | 118 @param height the height of the plateau, in source space. Can be positi ve, negative, |
117 or zero. A negative height means the simulated bevels slo pe downwards. | 119 or zero. A negative height means the simulated bevels slo pe downwards. |
118 */ | 120 */ |
119 static sk_sp<SkNormalSource> MakeBevel(BevelType, SkScalar width, SkScalar h eight); | 121 static sk_sp<SkNormalSource> MakeBevel(BevelType, SkScalar width, SkScalar h eight); |
120 | 122 |
121 SK_DEFINE_FLATTENABLE_TYPE(SkNormalSource) | 123 SK_DEFINE_FLATTENABLE_TYPE(SkNormalSource) |
122 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() | 124 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() |
123 }; | 125 }; |
124 | 126 |
125 #endif | 127 #endif |
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