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| 1 /* | |
| 2 * Copyright 2015 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "GrStrokeRectBatch.h" | |
| 9 #include "GrBatchTest.h" | |
| 10 #include "GrBatchFlushState.h" | |
| 11 #include "SkRandom.h" | |
| 12 | |
| 13 GrStrokeRectBatch::GrStrokeRectBatch(const Geometry& geometry, bool snapToPixelC
enters) | |
| 14 : INHERITED(ClassID()) { | |
| 15 fBatch.fHairline = geometry.fStrokeWidth == 0; | |
| 16 | |
| 17 fGeoData.push_back(geometry); | |
| 18 | |
| 19 // setup bounds | |
| 20 fBounds = geometry.fRect; | |
| 21 SkScalar rad = SkScalarHalf(geometry.fStrokeWidth); | |
| 22 fBounds.outset(rad, rad); | |
| 23 geometry.fViewMatrix.mapRect(&fBounds); | |
| 24 | |
| 25 // If our caller snaps to pixel centers then we have to round out the bounds | |
| 26 if (snapToPixelCenters) { | |
| 27 fBounds.roundOut(); | |
| 28 } | |
| 29 } | |
| 30 | |
| 31 void GrStrokeRectBatch::initBatchTracker(const GrPipelineOptimizations& opt) { | |
| 32 // Handle any color overrides | |
| 33 if (!opt.readsColor()) { | |
| 34 fGeoData[0].fColor = GrColor_ILLEGAL; | |
| 35 } | |
| 36 opt.getOverrideColorIfSet(&fGeoData[0].fColor); | |
| 37 | |
| 38 // setup batch properties | |
| 39 fBatch.fColorIgnored = !opt.readsColor(); | |
| 40 fBatch.fColor = fGeoData[0].fColor; | |
| 41 fBatch.fUsesLocalCoords = opt.readsLocalCoords(); | |
| 42 fBatch.fCoverageIgnored = !opt.readsCoverage(); | |
| 43 } | |
| 44 | |
| 45 /* create a triangle strip that strokes the specified rect. There are 8 | |
| 46 unique vertices, but we repeat the last 2 to close up. Alternatively we | |
| 47 could use an indices array, and then only send 8 verts, but not sure that | |
| 48 would be faster. | |
| 49 */ | |
| 50 static void init_stroke_rect_strip(SkPoint verts[10], const SkRect& rect, SkScal
ar width) { | |
| 51 const SkScalar rad = SkScalarHalf(width); | |
| 52 // TODO we should be able to enable this assert, but we'd have to filter the
se draws | |
| 53 // this is a bug | |
| 54 //SkASSERT(rad < rect.width() / 2 && rad < rect.height() / 2); | |
| 55 | |
| 56 verts[0].set(rect.fLeft + rad, rect.fTop + rad); | |
| 57 verts[1].set(rect.fLeft - rad, rect.fTop - rad); | |
| 58 verts[2].set(rect.fRight - rad, rect.fTop + rad); | |
| 59 verts[3].set(rect.fRight + rad, rect.fTop - rad); | |
| 60 verts[4].set(rect.fRight - rad, rect.fBottom - rad); | |
| 61 verts[5].set(rect.fRight + rad, rect.fBottom + rad); | |
| 62 verts[6].set(rect.fLeft + rad, rect.fBottom - rad); | |
| 63 verts[7].set(rect.fLeft - rad, rect.fBottom + rad); | |
| 64 verts[8] = verts[0]; | |
| 65 verts[9] = verts[1]; | |
| 66 } | |
| 67 | |
| 68 void GrStrokeRectBatch::onPrepareDraws(Target* target) { | |
| 69 SkAutoTUnref<const GrGeometryProcessor> gp; | |
| 70 { | |
| 71 using namespace GrDefaultGeoProcFactory; | |
| 72 Color color(this->color()); | |
| 73 Coverage coverage(this->coverageIgnored() ? Coverage::kSolid_Type : | |
| 74 Coverage::kNone_Type); | |
| 75 LocalCoords localCoords(this->usesLocalCoords() ? LocalCoords::kUsePosit
ion_Type : | |
| 76 LocalCoords::kUnused
_Type); | |
| 77 gp.reset(GrDefaultGeoProcFactory::Create(color, coverage, localCoords, | |
| 78 this->viewMatrix())); | |
| 79 } | |
| 80 | |
| 81 target->initDraw(gp, this->pipeline()); | |
| 82 | |
| 83 size_t vertexStride = gp->getVertexStride(); | |
| 84 | |
| 85 SkASSERT(vertexStride == sizeof(GrDefaultGeoProcFactory::PositionAttr)); | |
| 86 | |
| 87 Geometry& args = fGeoData[0]; | |
| 88 | |
| 89 int vertexCount = kVertsPerHairlineRect; | |
| 90 if (args.fStrokeWidth > 0) { | |
| 91 vertexCount = kVertsPerStrokeRect; | |
| 92 } | |
| 93 | |
| 94 const GrVertexBuffer* vertexBuffer; | |
| 95 int firstVertex; | |
| 96 | |
| 97 void* verts = target->makeVertexSpace(vertexStride, vertexCount, &vertexBuff
er, &firstVertex); | |
| 98 | |
| 99 if (!verts) { | |
| 100 SkDebugf("Could not allocate vertices\n"); | |
| 101 return; | |
| 102 } | |
| 103 | |
| 104 SkPoint* vertex = reinterpret_cast<SkPoint*>(verts); | |
| 105 | |
| 106 GrPrimitiveType primType; | |
| 107 | |
| 108 if (args.fStrokeWidth > 0) {; | |
| 109 primType = kTriangleStrip_GrPrimitiveType; | |
| 110 args.fRect.sort(); | |
| 111 init_stroke_rect_strip(vertex, args.fRect, args.fStrokeWidth); | |
| 112 } else { | |
| 113 // hairline | |
| 114 primType = kLineStrip_GrPrimitiveType; | |
| 115 vertex[0].set(args.fRect.fLeft, args.fRect.fTop); | |
| 116 vertex[1].set(args.fRect.fRight, args.fRect.fTop); | |
| 117 vertex[2].set(args.fRect.fRight, args.fRect.fBottom); | |
| 118 vertex[3].set(args.fRect.fLeft, args.fRect.fBottom); | |
| 119 vertex[4].set(args.fRect.fLeft, args.fRect.fTop); | |
| 120 } | |
| 121 | |
| 122 GrVertices vertices; | |
| 123 vertices.init(primType, vertexBuffer, firstVertex, vertexCount); | |
| 124 target->draw(vertices); | |
| 125 } | |
| 126 | |
| 127 #ifdef GR_TEST_UTILS | |
| 128 | |
| 129 DRAW_BATCH_TEST_DEFINE(GrStrokeRectBatch) { | |
| 130 GrStrokeRectBatch::Geometry geometry; | |
| 131 geometry.fViewMatrix = GrTest::TestMatrix(random); | |
| 132 geometry.fColor = GrRandomColor(random); | |
| 133 geometry.fRect = GrTest::TestRect(random); | |
| 134 geometry.fStrokeWidth = random->nextBool() ? 0.0f : 1.0f; | |
| 135 | |
| 136 return GrStrokeRectBatch::Create(geometry, random->nextBool()); | |
| 137 } | |
| 138 | |
| 139 #endif | |
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