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Side by Side Diff: include/effects/SkGradientShader.h

Issue 287063009: Revert of remove unused (by clients) SkUnitMapper (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Created 6 years, 7 months ago
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1 /* 1 /*
2 * Copyright 2006 The Android Open Source Project 2 * Copyright 2006 The Android Open Source Project
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 SkGradientShader_DEFINED 8 #ifndef SkGradientShader_DEFINED
9 #define SkGradientShader_DEFINED 9 #define SkGradientShader_DEFINED
10 10
11 #include "SkShader.h" 11 #include "SkShader.h"
12 12
13 class SkUnitMapper;
14
13 /** \class SkGradientShader 15 /** \class SkGradientShader
14 16
15 SkGradientShader hosts factories for creating subclasses of SkShader that 17 SkGradientShader hosts factories for creating subclasses of SkShader that
16 render linear and radial gradients. 18 render linear and radial gradients.
17 */ 19 */
18 class SK_API SkGradientShader { 20 class SK_API SkGradientShader {
19 public: 21 public:
20 enum Flags { 22 enum Flags {
21 /** By default gradients will interpolate their colors in unpremul space 23 /** By default gradients will interpolate their colors in unpremul space
22 * and then premultiply each of the results. By setting this flag, the 24 * and then premultiply each of the results. By setting this flag, the
(...skipping 11 matching lines...) Expand all
34 It is an error for count to be < 2. 36 It is an error for count to be < 2.
35 @param pts The start and end points for the gradient. 37 @param pts The start and end points for the gradient.
36 @param colors The array[count] of colors, to be distributed between th e two points 38 @param colors The array[count] of colors, to be distributed between th e two points
37 @param pos May be NULL. array[count] of SkScalars, or NULL, of the relative position of 39 @param pos May be NULL. array[count] of SkScalars, or NULL, of the relative position of
38 each corresponding color in the colors array. If this is NULL, 40 each corresponding color in the colors array. If this is NULL,
39 the the colors are distributed evenly between the start and end point. 41 the the colors are distributed evenly between the start and end point.
40 If this is not null, the values must begin with 0, end w ith 1.0, and 42 If this is not null, the values must begin with 0, end w ith 1.0, and
41 intermediate values must be strictly increasing. 43 intermediate values must be strictly increasing.
42 @param count Must be >=2. The number of colors (and pos if not NULL) entries. 44 @param count Must be >=2. The number of colors (and pos if not NULL) entries.
43 @param mode The tiling mode 45 @param mode The tiling mode
46 @param mapper May be NULL. Callback to modify the spread of the colors .
44 */ 47 */
45 static SkShader* CreateLinear(const SkPoint pts[2], 48 static SkShader* CreateLinear(const SkPoint pts[2],
46 const SkColor colors[], const SkScalar pos[], int count, 49 const SkColor colors[], const SkScalar pos[], int count,
47 SkShader::TileMode mode, 50 SkShader::TileMode mode,
48 uint32_t flags, const SkMatrix* localMatrix); 51 SkUnitMapper* mapper = NULL,
49 52 uint32_t flags = 0,
50 static SkShader* CreateLinear(const SkPoint pts[2], 53 const SkMatrix* localMatrix = NULL);
51 const SkColor colors[], const SkScalar pos[], int count,
52 SkShader::TileMode mode) {
53 return CreateLinear(pts, colors, pos, count, mode, 0, NULL);
54 }
55
56 #ifdef SK_SUPPORT_LEGACY_DEADUNITMAPPERTYPE
57 static SkShader* CreateLinear(const SkPoint pts[2],
58 const SkColor colors[], const SkScalar pos[], int count,
59 SkShader::TileMode mode,
60 SkDeadUnitMapperType*, // this type is now go ne
61 uint32_t flags,
62 const SkMatrix* localMatrix) {
63 return CreateLinear(pts, colors, pos, count, mode, flags, localMatrix);
64 }
65 #endif
66 54
67 /** Returns a shader that generates a radial gradient given the center and r adius. 55 /** Returns a shader that generates a radial gradient given the center and r adius.
68 <p /> 56 <p />
69 CreateRadial returns a shader with a reference count of 1. 57 CreateRadial returns a shader with a reference count of 1.
70 The caller should decrement the shader's reference count when done with the shader. 58 The caller should decrement the shader's reference count when done with the shader.
71 It is an error for colorCount to be < 2, or for radius to be <= 0. 59 It is an error for colorCount to be < 2, or for radius to be <= 0.
72 @param center The center of the circle for this gradient 60 @param center The center of the circle for this gradient
73 @param radius Must be positive. The radius of the circle for this grad ient 61 @param radius Must be positive. The radius of the circle for this grad ient
74 @param colors The array[count] of colors, to be distributed between th e center and edge of the circle 62 @param colors The array[count] of colors, to be distributed between th e center and edge of the circle
75 @param pos May be NULL. The array[count] of SkScalars, or NULL, of the relative position of 63 @param pos May be NULL. The array[count] of SkScalars, or NULL, of the relative position of
76 each corresponding color in the colors array. If this is NULL, 64 each corresponding color in the colors array. If this is NULL,
77 the the colors are distributed evenly between the center and edge of the circle. 65 the the colors are distributed evenly between the center and edge of the circle.
78 If this is not null, the values must begin with 0, end w ith 1.0, and 66 If this is not null, the values must begin with 0, end w ith 1.0, and
79 intermediate values must be strictly increasing. 67 intermediate values must be strictly increasing.
80 @param count Must be >= 2. The number of colors (and pos if not NULL) entries 68 @param count Must be >= 2. The number of colors (and pos if not NULL) entries
81 @param mode The tiling mode 69 @param mode The tiling mode
70 @param mapper May be NULL. Callback to modify the spread of the colors .
82 */ 71 */
83 static SkShader* CreateRadial(const SkPoint& center, SkScalar radius, 72 static SkShader* CreateRadial(const SkPoint& center, SkScalar radius,
84 const SkColor colors[], const SkScalar pos[], int count, 73 const SkColor colors[], const SkScalar pos[], int count,
85 SkShader::TileMode mode, 74 SkShader::TileMode mode,
86 uint32_t flags, const SkMatrix* localMatrix); 75 SkUnitMapper* mapper = NULL,
87 76 uint32_t flags = 0,
88 static SkShader* CreateRadial(const SkPoint& center, SkScalar radius, 77 const SkMatrix* localMatrix = NULL);
89 const SkColor colors[], const SkScalar pos[], int count,
90 SkShader::TileMode mode) {
91 return CreateRadial(center, radius, colors, pos, count, mode, 0, NULL);
92 }
93
94 #ifdef SK_SUPPORT_LEGACY_DEADUNITMAPPERTYPE
95 static SkShader* CreateRadial(const SkPoint& center, SkScalar radius,
96 const SkColor colors[], const SkScalar pos[], int count,
97 SkShader::TileMode mode,
98 SkDeadUnitMapperType*,
99 uint32_t flags, const SkMatrix* localMatrix) {
100 return CreateRadial(center, radius, colors, pos, count, mode, flags, loc alMatrix);
101 }
102 #endif
103 78
104 /** Returns a shader that generates a radial gradient given the start positi on, start radius, end position and end radius. 79 /** Returns a shader that generates a radial gradient given the start positi on, start radius, end position and end radius.
105 <p /> 80 <p />
106 CreateTwoPointRadial returns a shader with a reference count of 1. 81 CreateTwoPointRadial returns a shader with a reference count of 1.
107 The caller should decrement the shader's reference count when done with the shader. 82 The caller should decrement the shader's reference count when done with the shader.
108 It is an error for colorCount to be < 2, for startRadius or endRadius to be < 0, or for 83 It is an error for colorCount to be < 2, for startRadius or endRadius to be < 0, or for
109 startRadius to be equal to endRadius. 84 startRadius to be equal to endRadius.
110 @param start The center of the start circle for this gradient 85 @param start The center of the start circle for this gradient
111 @param startRadius Must be positive. The radius of the start circle f or this gradient. 86 @param startRadius Must be positive. The radius of the start circle f or this gradient.
112 @param end The center of the end circle for this gradient 87 @param end The center of the end circle for this gradient
113 @param endRadius Must be positive. The radius of the end circle for th is gradient. 88 @param endRadius Must be positive. The radius of the end circle for th is gradient.
114 @param colors The array[count] of colors, to be distributed between th e center and edge of the circle 89 @param colors The array[count] of colors, to be distributed between th e center and edge of the circle
115 @param pos May be NULL. The array[count] of SkScalars, or NULL, of the relative position of 90 @param pos May be NULL. The array[count] of SkScalars, or NULL, of the relative position of
116 each corresponding color in the colors array. If this is NULL, 91 each corresponding color in the colors array. If this is NULL,
117 the the colors are distributed evenly between the center and edge of the circle. 92 the the colors are distributed evenly between the center and edge of the circle.
118 If this is not null, the values must begin with 0, end w ith 1.0, and 93 If this is not null, the values must begin with 0, end w ith 1.0, and
119 intermediate values must be strictly increasing. 94 intermediate values must be strictly increasing.
120 @param count Must be >= 2. The number of colors (and pos if not NULL) entries 95 @param count Must be >= 2. The number of colors (and pos if not NULL) entries
121 @param mode The tiling mode 96 @param mode The tiling mode
97 @param mapper May be NULL. Callback to modify the spread of the colors .
122 */ 98 */
123 static SkShader* CreateTwoPointRadial(const SkPoint& start, SkScalar startRa dius, 99 static SkShader* CreateTwoPointRadial(const SkPoint& start,
124 const SkPoint& end, SkScalar endRadius , 100 SkScalar startRadius,
125 const SkColor colors[], const SkScalar pos[], int count, 101 const SkPoint& end,
102 SkScalar endRadius,
103 const SkColor colors[],
104 const SkScalar pos[], int count,
126 SkShader::TileMode mode, 105 SkShader::TileMode mode,
127 uint32_t flags, const SkMatrix* localM atrix); 106 SkUnitMapper* mapper = NULL,
128 107 uint32_t flags = 0,
129 static SkShader* CreateTwoPointRadial(const SkPoint& start, SkScalar startRa dius, 108 const SkMatrix* localMatrix = NULL);
130 const SkPoint& end, SkScalar endRadius ,
131 const SkColor colors[], const SkScalar pos[], int count,
132 SkShader::TileMode mode) {
133 return CreateTwoPointRadial(start, startRadius, end, endRadius, colors, pos, count, mode,
134 0, NULL);
135 }
136
137 #ifdef SK_SUPPORT_LEGACY_DEADUNITMAPPERTYPE
138 static SkShader* CreateTwoPointRadial(const SkPoint& start, SkScalar startRa dius,
139 const SkPoint& end, SkScalar endRadius ,
140 const SkColor colors[], const SkScalar pos[], int count,
141 SkShader::TileMode mode,
142 SkDeadUnitMapperType*,
143 uint32_t flags, const SkMatrix* localM atrix) {
144 return CreateTwoPointRadial(start, startRadius, end, endRadius, colors, pos, count, mode,
145 flags, localMatrix);
146 }
147 #endif
148 109
149 /** 110 /**
150 * Returns a shader that generates a conical gradient given two circles, or 111 * Returns a shader that generates a conical gradient given two circles, or
151 * returns NULL if the inputs are invalid. The gradient interprets the 112 * returns NULL if the inputs are invalid. The gradient interprets the
152 * two circles according to the following HTML spec. 113 * two circles according to the following HTML spec.
153 * http://dev.w3.org/html5/2dcontext/#dom-context-2d-createradialgradient 114 * http://dev.w3.org/html5/2dcontext/#dom-context-2d-createradialgradient
154 */ 115 */
155 static SkShader* CreateTwoPointConical(const SkPoint& start, SkScalar startR adius, 116 static SkShader* CreateTwoPointConical(const SkPoint& start,
156 const SkPoint& end, SkScalar endRadiu s, 117 SkScalar startRadius,
157 const SkColor colors[], const SkScala r pos[], int count, 118 const SkPoint& end,
119 SkScalar endRadius,
120 const SkColor colors[],
121 const SkScalar pos[], int count,
158 SkShader::TileMode mode, 122 SkShader::TileMode mode,
159 uint32_t flags, const SkMatrix* local Matrix); 123 SkUnitMapper* mapper = NULL,
160 124 uint32_t flags = 0,
161 static SkShader* CreateTwoPointConical(const SkPoint& start, SkScalar startR adius, 125 const SkMatrix* localMatrix = NULL);
162 const SkPoint& end, SkScalar endRadiu s,
163 const SkColor colors[], const SkScala r pos[], int count,
164 SkShader::TileMode mode) {
165 return CreateTwoPointConical(start, startRadius, end, endRadius, colors, pos, count, mode,
166 0, NULL);
167 }
168
169 #ifdef SK_SUPPORT_LEGACY_DEADUNITMAPPERTYPE
170 static SkShader* CreateTwoPointConical(const SkPoint& start, SkScalar startR adius,
171 const SkPoint& end, SkScalar endRadiu s,
172 const SkColor colors[], const SkScala r pos[], int count,
173 SkShader::TileMode mode,
174 SkDeadUnitMapperType*,
175 uint32_t flags, const SkMatrix* local Matrix) {
176 return CreateTwoPointConical(start, startRadius, end, endRadius, colors, pos, count, mode,
177 flags, localMatrix);
178 }
179 #endif
180 126
181 /** Returns a shader that generates a sweep gradient given a center. 127 /** Returns a shader that generates a sweep gradient given a center.
182 <p /> 128 <p />
183 CreateSweep returns a shader with a reference count of 1. 129 CreateSweep returns a shader with a reference count of 1.
184 The caller should decrement the shader's reference count when done with the shader. 130 The caller should decrement the shader's reference count when done with the shader.
185 It is an error for colorCount to be < 2. 131 It is an error for colorCount to be < 2.
186 @param cx The X coordinate of the center of the sweep 132 @param cx The X coordinate of the center of the sweep
187 @param cx The Y coordinate of the center of the sweep 133 @param cx The Y coordinate of the center of the sweep
188 @param colors The array[count] of colors, to be distributed around the center. 134 @param colors The array[count] of colors, to be distributed around the center.
189 @param pos May be NULL. The array[count] of SkScalars, or NULL, of the relative position of 135 @param pos May be NULL. The array[count] of SkScalars, or NULL, of the relative position of
190 each corresponding color in the colors array. If this is NULL, 136 each corresponding color in the colors array. If this is NULL,
191 the the colors are distributed evenly between the center and edge of the circle. 137 the the colors are distributed evenly between the center and edge of the circle.
192 If this is not null, the values must begin with 0, end w ith 1.0, and 138 If this is not null, the values must begin with 0, end w ith 1.0, and
193 intermediate values must be strictly increasing. 139 intermediate values must be strictly increasing.
194 @param count Must be >= 2. The number of colors (and pos if not NULL) entries 140 @param count Must be >= 2. The number of colors (and pos if not NULL) entries
141 @param mapper May be NULL. Callback to modify the spread of the colors .
195 */ 142 */
196 static SkShader* CreateSweep(SkScalar cx, SkScalar cy, 143 static SkShader* CreateSweep(SkScalar cx, SkScalar cy,
197 const SkColor colors[], const SkScalar pos[], i nt count, 144 const SkColor colors[], const SkScalar pos[],
198 uint32_t flags, const SkMatrix* localMatrix); 145 int count, SkUnitMapper* mapper = NULL,
199 146 uint32_t flags = 0,
200 static SkShader* CreateSweep(SkScalar cx, SkScalar cy, 147 const SkMatrix* localMatrix = NULL);
201 const SkColor colors[], const SkScalar pos[], i nt count) {
202 return CreateSweep(cx, cy, colors, pos, count, 0, NULL);
203 }
204
205 #ifdef SK_SUPPORT_LEGACY_DEADUNITMAPPERTYPE
206 static SkShader* CreateSweep(SkScalar cx, SkScalar cy,
207 const SkColor colors[], const SkScalar pos[], i nt count,
208 SkDeadUnitMapperType*,
209 uint32_t flags, const SkMatrix* localMatrix) {
210 return CreateSweep(cx, cy, colors, pos, count, flags, localMatrix);
211 }
212 #endif
213 148
214 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() 149 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
215 }; 150 };
216 151
217 #endif 152 #endif
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