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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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