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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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38 // the quadratic's bounding triangle but has been expanded so that the | 38 // the quadratic's bounding triangle but has been expanded so that the |
39 // 1-pixel wide area around the curve is inside the poly. | 39 // 1-pixel wide area around the curve is inside the poly. |
40 // If a,b,c are the original control points then the poly a0,b0,c0,c1,a1 | 40 // If a,b,c are the original control points then the poly a0,b0,c0,c1,a1 |
41 // that is rendered would look like this: | 41 // that is rendered would look like this: |
42 // b0 | 42 // b0 |
43 // b | 43 // b |
44 // | 44 // |
45 // a0 c0 | 45 // a0 c0 |
46 // a c | 46 // a c |
47 // a1 c1 | 47 // a1 c1 |
48 // Each is drawn as three triangles specified by these 9 indices: | 48 // Each is drawn as three triangles ((a0,a1,b0), (b0,c1,c0), (a1,c1,b0)) |
| 49 // specified by these 9 indices: |
49 static const uint16_t kQuadIdxBufPattern[] = { | 50 static const uint16_t kQuadIdxBufPattern[] = { |
50 0, 1, 2, | 51 0, 1, 2, |
51 2, 4, 3, | 52 2, 4, 3, |
52 1, 4, 2 | 53 1, 4, 2 |
53 }; | 54 }; |
54 | 55 |
55 static const int kIdxsPerQuad = SK_ARRAY_COUNT(kQuadIdxBufPattern); | 56 static const int kIdxsPerQuad = SK_ARRAY_COUNT(kQuadIdxBufPattern); |
56 static const int kQuadNumVertices = 5; | 57 static const int kQuadNumVertices = 5; |
57 static const int kQuadsNumInIdxBuffer = 256; | 58 static const int kQuadsNumInIdxBuffer = 256; |
58 | 59 |
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936 kQuadNumVertices*quads, // sta
rtV | 937 kQuadNumVertices*quads, // sta
rtV |
937 0, // sta
rtI | 938 0, // sta
rtI |
938 kQuadNumVertices*n, // vCo
unt | 939 kQuadNumVertices*n, // vCo
unt |
939 kIdxsPerQuad*n, // iCo
unt | 940 kIdxsPerQuad*n, // iCo
unt |
940 &devBounds); | 941 &devBounds); |
941 quads += n; | 942 quads += n; |
942 } | 943 } |
943 } | 944 } |
944 | 945 |
945 if (conicCnt > 0) { | 946 if (conicCnt > 0) { |
946 GrDrawState::AutoRestoreEffects are(drawState); | |
947 SkAutoTUnref<GrGeometryProcessor> hairConicProcessor( | 947 SkAutoTUnref<GrGeometryProcessor> hairConicProcessor( |
948 GrConicEffect::Create(color, kHairlineAA_GrProcessorEdgeType
, *target->caps(), | 948 GrConicEffect::Create(color, kHairlineAA_GrProcessorEdgeType
, *target->caps(), |
949 newCoverage)); | 949 newCoverage)); |
950 SkASSERT(hairConicProcessor); | 950 SkASSERT(hairConicProcessor); |
| 951 GrDrawState::AutoRestoreEffects are(drawState); |
| 952 target->setIndexSourceToBuffer(fQuadsIndexBuffer); |
951 | 953 |
952 int conics = 0; | 954 int conics = 0; |
953 while (conics < conicCnt) { | 955 while (conics < conicCnt) { |
954 int n = SkTMin(conicCnt - conics, kQuadsNumInIdxBuffer); | 956 int n = SkTMin(conicCnt - conics, kQuadsNumInIdxBuffer); |
955 target->drawIndexed(drawState, | 957 target->drawIndexed(drawState, |
956 hairConicProcessor, | 958 hairConicProcessor, |
957 kTriangles_GrPrimitiveType, | 959 kTriangles_GrPrimitiveType, |
958 kQuadNumVertices*(quadCnt + conics), // sta
rtV | 960 kQuadNumVertices*(quadCnt + conics), // sta
rtV |
959 0, // sta
rtI | 961 0, // sta
rtI |
960 kQuadNumVertices*n, // vCo
unt | 962 kQuadNumVertices*n, // vCo
unt |
961 kIdxsPerQuad*n, // iCo
unt | 963 kIdxsPerQuad*n, // iCo
unt |
962 &devBounds); | 964 &devBounds); |
963 conics += n; | 965 conics += n; |
964 } | 966 } |
965 } | 967 } |
966 } | 968 } |
967 | 969 |
968 target->resetIndexSource(); | 970 target->resetIndexSource(); |
969 | 971 |
970 return true; | 972 return true; |
971 } | 973 } |
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