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1 /* | 1 /* |
2 * Copyright 2011 Google Inc. | 2 * Copyright 2011 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 #include "GrAAHairLinePathRenderer.h" | 8 #include "GrAAHairLinePathRenderer.h" |
9 | 9 |
10 #include "GrContext.h" | 10 #include "GrContext.h" |
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43 static const size_t kQuadIdxSBufize = kIdxsPerQuad * | 43 static const size_t kQuadIdxSBufize = kIdxsPerQuad * |
44 sizeof(uint16_t) * | 44 sizeof(uint16_t) * |
45 kNumQuadsInIdxBuffer; | 45 kNumQuadsInIdxBuffer; |
46 | 46 |
47 static const int kNumLineSegsInIdxBuffer = 256; | 47 static const int kNumLineSegsInIdxBuffer = 256; |
48 static const size_t kLineSegIdxSBufize = kIdxsPerLineSeg * | 48 static const size_t kLineSegIdxSBufize = kIdxsPerLineSeg * |
49 sizeof(uint16_t) * | 49 sizeof(uint16_t) * |
50 kNumLineSegsInIdxBuffer; | 50 kNumLineSegsInIdxBuffer; |
51 | 51 |
52 static bool push_quad_index_data(GrIndexBuffer* qIdxBuffer) { | 52 static bool push_quad_index_data(GrIndexBuffer* qIdxBuffer) { |
53 uint16_t* data = (uint16_t*) qIdxBuffer->lock(); | 53 uint16_t* data = (uint16_t*) qIdxBuffer->map(); |
54 bool tempData = NULL == data; | 54 bool tempData = NULL == data; |
55 if (tempData) { | 55 if (tempData) { |
56 data = SkNEW_ARRAY(uint16_t, kNumQuadsInIdxBuffer * kIdxsPerQuad); | 56 data = SkNEW_ARRAY(uint16_t, kNumQuadsInIdxBuffer * kIdxsPerQuad); |
57 } | 57 } |
58 for (int i = 0; i < kNumQuadsInIdxBuffer; ++i) { | 58 for (int i = 0; i < kNumQuadsInIdxBuffer; ++i) { |
59 | 59 |
60 // Each quadratic is rendered as a five sided polygon. This poly bounds | 60 // Each quadratic is rendered as a five sided polygon. This poly bounds |
61 // the quadratic's bounding triangle but has been expanded so that the | 61 // the quadratic's bounding triangle but has been expanded so that the |
62 // 1-pixel wide area around the curve is inside the poly. | 62 // 1-pixel wide area around the curve is inside the poly. |
63 // If a,b,c are the original control points then the poly a0,b0,c0,c1,a1 | 63 // If a,b,c are the original control points then the poly a0,b0,c0,c1,a1 |
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79 data[5 + baseIdx] = baseVert + 3; // c0 | 79 data[5 + baseIdx] = baseVert + 3; // c0 |
80 data[6 + baseIdx] = baseVert + 1; // a1 | 80 data[6 + baseIdx] = baseVert + 1; // a1 |
81 data[7 + baseIdx] = baseVert + 4; // c1 | 81 data[7 + baseIdx] = baseVert + 4; // c1 |
82 data[8 + baseIdx] = baseVert + 2; // b0 | 82 data[8 + baseIdx] = baseVert + 2; // b0 |
83 } | 83 } |
84 if (tempData) { | 84 if (tempData) { |
85 bool ret = qIdxBuffer->updateData(data, kQuadIdxSBufize); | 85 bool ret = qIdxBuffer->updateData(data, kQuadIdxSBufize); |
86 delete[] data; | 86 delete[] data; |
87 return ret; | 87 return ret; |
88 } else { | 88 } else { |
89 qIdxBuffer->unlock(); | 89 qIdxBuffer->unmap(); |
90 return true; | 90 return true; |
91 } | 91 } |
92 } | 92 } |
93 | 93 |
94 static bool push_line_index_data(GrIndexBuffer* lIdxBuffer) { | 94 static bool push_line_index_data(GrIndexBuffer* lIdxBuffer) { |
95 uint16_t* data = (uint16_t*) lIdxBuffer->lock(); | 95 uint16_t* data = (uint16_t*) lIdxBuffer->map(); |
96 bool tempData = NULL == data; | 96 bool tempData = NULL == data; |
97 if (tempData) { | 97 if (tempData) { |
98 data = SkNEW_ARRAY(uint16_t, kNumLineSegsInIdxBuffer * kIdxsPerLineSeg); | 98 data = SkNEW_ARRAY(uint16_t, kNumLineSegsInIdxBuffer * kIdxsPerLineSeg); |
99 } | 99 } |
100 for (int i = 0; i < kNumLineSegsInIdxBuffer; ++i) { | 100 for (int i = 0; i < kNumLineSegsInIdxBuffer; ++i) { |
101 // Each line segment is rendered as two quads and two triangles. | 101 // Each line segment is rendered as two quads and two triangles. |
102 // p0 and p1 have alpha = 1 while all other points have alpha = 0. | 102 // p0 and p1 have alpha = 1 while all other points have alpha = 0. |
103 // The four external points are offset 1 pixel perpendicular to the | 103 // The four external points are offset 1 pixel perpendicular to the |
104 // line and half a pixel parallel to the line. | 104 // line and half a pixel parallel to the line. |
105 // | 105 // |
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132 | 132 |
133 data[15 + baseIdx] = baseVert + 1; | 133 data[15 + baseIdx] = baseVert + 1; |
134 data[16 + baseIdx] = baseVert + 5; | 134 data[16 + baseIdx] = baseVert + 5; |
135 data[17 + baseIdx] = baseVert + 3; | 135 data[17 + baseIdx] = baseVert + 3; |
136 } | 136 } |
137 if (tempData) { | 137 if (tempData) { |
138 bool ret = lIdxBuffer->updateData(data, kLineSegIdxSBufize); | 138 bool ret = lIdxBuffer->updateData(data, kLineSegIdxSBufize); |
139 delete[] data; | 139 delete[] data; |
140 return ret; | 140 return ret; |
141 } else { | 141 } else { |
142 lIdxBuffer->unlock(); | 142 lIdxBuffer->unmap(); |
143 return true; | 143 return true; |
144 } | 144 } |
145 } | 145 } |
146 } | 146 } |
147 | 147 |
148 GrPathRenderer* GrAAHairLinePathRenderer::Create(GrContext* context) { | 148 GrPathRenderer* GrAAHairLinePathRenderer::Create(GrContext* context) { |
149 GrGpu* gpu = context->getGpu(); | 149 GrGpu* gpu = context->getGpu(); |
150 GrIndexBuffer* qIdxBuf = gpu->createIndexBuffer(kQuadIdxSBufize, false); | 150 GrIndexBuffer* qIdxBuf = gpu->createIndexBuffer(kQuadIdxSBufize, false); |
151 SkAutoTUnref<GrIndexBuffer> qIdxBuffer(qIdxBuf); | 151 SkAutoTUnref<GrIndexBuffer> qIdxBuffer(qIdxBuf); |
152 if (NULL == qIdxBuf || !push_quad_index_data(qIdxBuf)) { | 152 if (NULL == qIdxBuf || !push_quad_index_data(qIdxBuf)) { |
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1033 &devBounds); | 1033 &devBounds); |
1034 conics += n; | 1034 conics += n; |
1035 } | 1035 } |
1036 } | 1036 } |
1037 } | 1037 } |
1038 | 1038 |
1039 target->resetIndexSource(); | 1039 target->resetIndexSource(); |
1040 | 1040 |
1041 return true; | 1041 return true; |
1042 } | 1042 } |
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