| /* | |
| * Copyright 2013 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| // This test only works with the GPU backend. | |
| #include "gm.h" | |
| #if SK_SUPPORT_GPU | |
| #include "GrContext.h" | |
| #include "GrPathUtils.h" | |
| #include "GrTest.h" | |
| #include "SkColorPriv.h" | |
| #include "SkDevice.h" | |
| #include "SkGeometry.h" | |
| #include "effects/GrBezierEffect.h" | |
| // Position & KLM line eq values. These are the vertex attributes for Bezier curves. The last value | |
| // of the Vec4f is ignored. | |
| namespace { | |
| extern const GrVertexAttrib kAttribs[] = { | |
| {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding}, | |
| {kVec4f_GrVertexAttribType, sizeof(SkPoint), kGeometryProcessor_GrVertexAttribBinding} | |
| }; | |
| } | |
| static inline SkScalar eval_line(const SkPoint& p, const SkScalar lineEq[3], SkScalar sign) { | |
| return sign * (lineEq[0] * p.fX + lineEq[1] * p.fY + lineEq[2]); | |
| } | |
| namespace skiagm { | |
| /** | |
| * This GM directly exercises effects that draw Bezier curves in the GPU backend. | |
| */ | |
| class BezierCubicEffects : public GM { | |
| public: | |
| BezierCubicEffects() { | |
| this->setBGColor(0xFFFFFFFF); | |
| } | |
| protected: | |
| virtual SkString onShortName() SK_OVERRIDE { | |
| return SkString("bezier_cubic_effects"); | |
| } | |
| virtual SkISize onISize() SK_OVERRIDE { | |
| return SkISize::Make(800, 800); | |
| } | |
| virtual uint32_t onGetFlags() const SK_OVERRIDE { | |
| // This is a GPU-specific GM. | |
| return kGPUOnly_Flag; | |
| } | |
| virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { | |
| GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget(); | |
| if (NULL == rt) { | |
| return; | |
| } | |
| GrContext* context = rt->getContext(); | |
| if (NULL == context) { | |
| return; | |
| } | |
| struct Vertex { | |
| SkPoint fPosition; | |
| float fKLM[4]; // The last value is ignored. The effect expects a vec4f. | |
| }; | |
| static const int kNumCubics = 15; | |
| SkRandom rand; | |
| // Mult by 3 for each edge effect type | |
| int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumCubics*3))); | |
| int numRows = SkScalarCeilToInt(SkIntToScalar(kNumCubics*3) / numCols); | |
| SkScalar w = SkIntToScalar(rt->width()) / numCols; | |
| SkScalar h = SkIntToScalar(rt->height()) / numRows; | |
| int row = 0; | |
| int col = 0; | |
| for (int i = 0; i < kNumCubics; ++i) { | |
| SkPoint baseControlPts[] = { | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}, | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}, | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}, | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)} | |
| }; | |
| for(int edgeType = 0; edgeType < kGrProcessorEdgeTypeCnt; ++edgeType) { | |
| SkAutoTUnref<GrGeometryProcessor> gp; | |
| { // scope to contain GrTestTarget | |
| GrTestTarget tt; | |
| context->getTestTarget(&tt); | |
| if (NULL == tt.target()) { | |
| continue; | |
| } | |
| GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)edgeType; | |
| gp.reset(GrCubicEffect::Create(et, *tt.target()->caps())); | |
| if (!gp) { | |
| continue; | |
| } | |
| } | |
| SkScalar x = SkScalarMul(col, w); | |
| SkScalar y = SkScalarMul(row, h); | |
| SkPoint controlPts[] = { | |
| {x + baseControlPts[0].fX, y + baseControlPts[0].fY}, | |
| {x + baseControlPts[1].fX, y + baseControlPts[1].fY}, | |
| {x + baseControlPts[2].fX, y + baseControlPts[2].fY}, | |
| {x + baseControlPts[3].fX, y + baseControlPts[3].fY} | |
| }; | |
| SkPoint chopped[10]; | |
| SkScalar klmEqs[9]; | |
| SkScalar klmSigns[3]; | |
| int cnt = GrPathUtils::chopCubicAtLoopIntersection(controlPts, | |
| chopped, | |
| klmEqs, | |
| klmSigns); | |
| SkPaint ctrlPtPaint; | |
| ctrlPtPaint.setColor(rand.nextU() | 0xFF000000); | |
| for (int i = 0; i < 4; ++i) { | |
| canvas->drawCircle(controlPts[i].fX, controlPts[i].fY, 6.f, ctrlPtPaint); | |
| } | |
| SkPaint polyPaint; | |
| polyPaint.setColor(0xffA0A0A0); | |
| polyPaint.setStrokeWidth(0); | |
| polyPaint.setStyle(SkPaint::kStroke_Style); | |
| canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, controlPts, polyPaint); | |
| SkPaint choppedPtPaint; | |
| choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000); | |
| for (int c = 0; c < cnt; ++c) { | |
| SkPoint* pts = chopped + 3 * c; | |
| for (int i = 0; i < 4; ++i) { | |
| canvas->drawCircle(pts[i].fX, pts[i].fY, 3.f, choppedPtPaint); | |
| } | |
| SkRect bounds; | |
| bounds.set(pts, 4); | |
| SkPaint boundsPaint; | |
| boundsPaint.setColor(0xff808080); | |
| boundsPaint.setStrokeWidth(0); | |
| boundsPaint.setStyle(SkPaint::kStroke_Style); | |
| canvas->drawRect(bounds, boundsPaint); | |
| Vertex verts[4]; | |
| verts[0].fPosition.setRectFan(bounds.fLeft, bounds.fTop, | |
| bounds.fRight, bounds.fBottom, | |
| sizeof(Vertex)); | |
| for (int v = 0; v < 4; ++v) { | |
| verts[v].fKLM[0] = eval_line(verts[v].fPosition, klmEqs + 0, klmSigns[c]); | |
| verts[v].fKLM[1] = eval_line(verts[v].fPosition, klmEqs + 3, klmSigns[c]); | |
| verts[v].fKLM[2] = eval_line(verts[v].fPosition, klmEqs + 6, 1.f); | |
| } | |
| GrTestTarget tt; | |
| context->getTestTarget(&tt); | |
| SkASSERT(tt.target()); | |
| GrDrawState* drawState = tt.target()->drawState(); | |
| drawState->setVertexAttribs<kAttribs>(2, sizeof(Vertex)); | |
| drawState->setGeometryProcessor(gp); | |
| drawState->setRenderTarget(rt); | |
| drawState->setColor(0xff000000); | |
| tt.target()->setVertexSourceToArray(verts, 4); | |
| tt.target()->setIndexSourceToBuffer(context->getQuadIndexBuffer()); | |
| tt.target()->drawIndexed(kTriangleFan_GrPrimitiveType, 0, 0, 4, 6); | |
| } | |
| ++col; | |
| if (numCols == col) { | |
| col = 0; | |
| ++row; | |
| } | |
| } | |
| } | |
| } | |
| private: | |
| typedef GM INHERITED; | |
| }; | |
| ////////////////////////////////////////////////////////////////////////////// | |
| /** | |
| * This GM directly exercises effects that draw Bezier curves in the GPU backend. | |
| */ | |
| class BezierConicEffects : public GM { | |
| public: | |
| BezierConicEffects() { | |
| this->setBGColor(0xFFFFFFFF); | |
| } | |
| protected: | |
| virtual SkString onShortName() SK_OVERRIDE { | |
| return SkString("bezier_conic_effects"); | |
| } | |
| virtual SkISize onISize() SK_OVERRIDE { | |
| return SkISize::Make(800, 800); | |
| } | |
| virtual uint32_t onGetFlags() const SK_OVERRIDE { | |
| // This is a GPU-specific GM. | |
| return kGPUOnly_Flag; | |
| } | |
| virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { | |
| GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget(); | |
| if (NULL == rt) { | |
| return; | |
| } | |
| GrContext* context = rt->getContext(); | |
| if (NULL == context) { | |
| return; | |
| } | |
| struct Vertex { | |
| SkPoint fPosition; | |
| float fKLM[4]; // The last value is ignored. The effect expects a vec4f. | |
| }; | |
| static const int kNumConics = 10; | |
| SkRandom rand; | |
| // Mult by 3 for each edge effect type | |
| int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumConics*3))); | |
| int numRows = SkScalarCeilToInt(SkIntToScalar(kNumConics*3) / numCols); | |
| SkScalar w = SkIntToScalar(rt->width()) / numCols; | |
| SkScalar h = SkIntToScalar(rt->height()) / numRows; | |
| int row = 0; | |
| int col = 0; | |
| for (int i = 0; i < kNumConics; ++i) { | |
| SkPoint baseControlPts[] = { | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}, | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}, | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)} | |
| }; | |
| SkScalar weight = rand.nextRangeF(0.f, 2.f); | |
| for(int edgeType = 0; edgeType < kGrProcessorEdgeTypeCnt; ++edgeType) { | |
| SkAutoTUnref<GrGeometryProcessor> gp; | |
| { // scope to contain GrTestTarget | |
| GrTestTarget tt; | |
| context->getTestTarget(&tt); | |
| if (NULL == tt.target()) { | |
| continue; | |
| } | |
| GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)edgeType; | |
| gp.reset(GrConicEffect::Create(et, *tt.target()->caps())); | |
| if (!gp) { | |
| continue; | |
| } | |
| } | |
| SkScalar x = SkScalarMul(col, w); | |
| SkScalar y = SkScalarMul(row, h); | |
| SkPoint controlPts[] = { | |
| {x + baseControlPts[0].fX, y + baseControlPts[0].fY}, | |
| {x + baseControlPts[1].fX, y + baseControlPts[1].fY}, | |
| {x + baseControlPts[2].fX, y + baseControlPts[2].fY} | |
| }; | |
| SkConic dst[4]; | |
| SkScalar klmEqs[9]; | |
| int cnt = chop_conic(controlPts, dst, weight); | |
| GrPathUtils::getConicKLM(controlPts, weight, klmEqs); | |
| SkPaint ctrlPtPaint; | |
| ctrlPtPaint.setColor(rand.nextU() | 0xFF000000); | |
| for (int i = 0; i < 3; ++i) { | |
| canvas->drawCircle(controlPts[i].fX, controlPts[i].fY, 6.f, ctrlPtPaint); | |
| } | |
| SkPaint polyPaint; | |
| polyPaint.setColor(0xffA0A0A0); | |
| polyPaint.setStrokeWidth(0); | |
| polyPaint.setStyle(SkPaint::kStroke_Style); | |
| canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, controlPts, polyPaint); | |
| SkPaint choppedPtPaint; | |
| choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000); | |
| for (int c = 0; c < cnt; ++c) { | |
| SkPoint* pts = dst[c].fPts; | |
| for (int i = 0; i < 3; ++i) { | |
| canvas->drawCircle(pts[i].fX, pts[i].fY, 3.f, choppedPtPaint); | |
| } | |
| SkRect bounds; | |
| //SkPoint bPts[] = {{0.f, 0.f}, {800.f, 800.f}}; | |
| //bounds.set(bPts, 2); | |
| bounds.set(pts, 3); | |
| SkPaint boundsPaint; | |
| boundsPaint.setColor(0xff808080); | |
| boundsPaint.setStrokeWidth(0); | |
| boundsPaint.setStyle(SkPaint::kStroke_Style); | |
| canvas->drawRect(bounds, boundsPaint); | |
| Vertex verts[4]; | |
| verts[0].fPosition.setRectFan(bounds.fLeft, bounds.fTop, | |
| bounds.fRight, bounds.fBottom, | |
| sizeof(Vertex)); | |
| for (int v = 0; v < 4; ++v) { | |
| verts[v].fKLM[0] = eval_line(verts[v].fPosition, klmEqs + 0, 1.f); | |
| verts[v].fKLM[1] = eval_line(verts[v].fPosition, klmEqs + 3, 1.f); | |
| verts[v].fKLM[2] = eval_line(verts[v].fPosition, klmEqs + 6, 1.f); | |
| } | |
| GrTestTarget tt; | |
| context->getTestTarget(&tt); | |
| SkASSERT(tt.target()); | |
| GrDrawState* drawState = tt.target()->drawState(); | |
| drawState->setVertexAttribs<kAttribs>(2, sizeof(Vertex)); | |
| drawState->setGeometryProcessor(gp); | |
| drawState->setRenderTarget(rt); | |
| drawState->setColor(0xff000000); | |
| tt.target()->setVertexSourceToArray(verts, 4); | |
| tt.target()->setIndexSourceToBuffer(context->getQuadIndexBuffer()); | |
| tt.target()->drawIndexed(kTriangleFan_GrPrimitiveType, 0, 0, 4, 6); | |
| } | |
| ++col; | |
| if (numCols == col) { | |
| col = 0; | |
| ++row; | |
| } | |
| } | |
| } | |
| } | |
| private: | |
| // Uses the max curvature function for quads to estimate | |
| // where to chop the conic. If the max curvature is not | |
| // found along the curve segment it will return 1 and | |
| // dst[0] is the original conic. If it returns 2 the dst[0] | |
| // and dst[1] are the two new conics. | |
| int split_conic(const SkPoint src[3], SkConic dst[2], const SkScalar weight) { | |
| SkScalar t = SkFindQuadMaxCurvature(src); | |
| if (t == 0) { | |
| if (dst) { | |
| dst[0].set(src, weight); | |
| } | |
| return 1; | |
| } else { | |
| if (dst) { | |
| SkConic conic; | |
| conic.set(src, weight); | |
| conic.chopAt(t, dst); | |
| } | |
| return 2; | |
| } | |
| } | |
| // Calls split_conic on the entire conic and then once more on each subsection. | |
| // Most cases will result in either 1 conic (chop point is not within t range) | |
| // or 3 points (split once and then one subsection is split again). | |
| int chop_conic(const SkPoint src[3], SkConic dst[4], const SkScalar weight) { | |
| SkConic dstTemp[2]; | |
| int conicCnt = split_conic(src, dstTemp, weight); | |
| if (2 == conicCnt) { | |
| int conicCnt2 = split_conic(dstTemp[0].fPts, dst, dstTemp[0].fW); | |
| conicCnt = conicCnt2 + split_conic(dstTemp[1].fPts, &dst[conicCnt2], dstTemp[1].fW); | |
| } else { | |
| dst[0] = dstTemp[0]; | |
| } | |
| return conicCnt; | |
| } | |
| typedef GM INHERITED; | |
| }; | |
| ////////////////////////////////////////////////////////////////////////////// | |
| /** | |
| * This GM directly exercises effects that draw Bezier quad curves in the GPU backend. | |
| */ | |
| class BezierQuadEffects : public GM { | |
| public: | |
| BezierQuadEffects() { | |
| this->setBGColor(0xFFFFFFFF); | |
| } | |
| protected: | |
| virtual SkString onShortName() SK_OVERRIDE { | |
| return SkString("bezier_quad_effects"); | |
| } | |
| virtual SkISize onISize() SK_OVERRIDE { | |
| return SkISize::Make(800, 800); | |
| } | |
| virtual uint32_t onGetFlags() const SK_OVERRIDE { | |
| // This is a GPU-specific GM. | |
| return kGPUOnly_Flag; | |
| } | |
| virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { | |
| GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget(); | |
| if (NULL == rt) { | |
| return; | |
| } | |
| GrContext* context = rt->getContext(); | |
| if (NULL == context) { | |
| return; | |
| } | |
| struct Vertex { | |
| SkPoint fPosition; | |
| float fUV[4]; // The last two values are ignored. The effect expects a vec4f. | |
| }; | |
| static const int kNumQuads = 5; | |
| SkRandom rand; | |
| int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumQuads*3))); | |
| int numRows = SkScalarCeilToInt(SkIntToScalar(kNumQuads*3) / numCols); | |
| SkScalar w = SkIntToScalar(rt->width()) / numCols; | |
| SkScalar h = SkIntToScalar(rt->height()) / numRows; | |
| int row = 0; | |
| int col = 0; | |
| for (int i = 0; i < kNumQuads; ++i) { | |
| SkPoint baseControlPts[] = { | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}, | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}, | |
| {rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)} | |
| }; | |
| for(int edgeType = 0; edgeType < kGrProcessorEdgeTypeCnt; ++edgeType) { | |
| SkAutoTUnref<GrGeometryProcessor> gp; | |
| { // scope to contain GrTestTarget | |
| GrTestTarget tt; | |
| context->getTestTarget(&tt); | |
| if (NULL == tt.target()) { | |
| continue; | |
| } | |
| GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)edgeType; | |
| gp.reset(GrQuadEffect::Create(et, *tt.target()->caps())); | |
| if (!gp) { | |
| continue; | |
| } | |
| } | |
| SkScalar x = SkScalarMul(col, w); | |
| SkScalar y = SkScalarMul(row, h); | |
| SkPoint controlPts[] = { | |
| {x + baseControlPts[0].fX, y + baseControlPts[0].fY}, | |
| {x + baseControlPts[1].fX, y + baseControlPts[1].fY}, | |
| {x + baseControlPts[2].fX, y + baseControlPts[2].fY} | |
| }; | |
| SkPoint chopped[5]; | |
| int cnt = SkChopQuadAtMaxCurvature(controlPts, chopped); | |
| SkPaint ctrlPtPaint; | |
| ctrlPtPaint.setColor(rand.nextU() | 0xFF000000); | |
| for (int i = 0; i < 3; ++i) { | |
| canvas->drawCircle(controlPts[i].fX, controlPts[i].fY, 6.f, ctrlPtPaint); | |
| } | |
| SkPaint polyPaint; | |
| polyPaint.setColor(0xffA0A0A0); | |
| polyPaint.setStrokeWidth(0); | |
| polyPaint.setStyle(SkPaint::kStroke_Style); | |
| canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, controlPts, polyPaint); | |
| SkPaint choppedPtPaint; | |
| choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000); | |
| for (int c = 0; c < cnt; ++c) { | |
| SkPoint* pts = chopped + 2 * c; | |
| for (int i = 0; i < 3; ++i) { | |
| canvas->drawCircle(pts[i].fX, pts[i].fY, 3.f, choppedPtPaint); | |
| } | |
| SkRect bounds; | |
| bounds.set(pts, 3); | |
| SkPaint boundsPaint; | |
| boundsPaint.setColor(0xff808080); | |
| boundsPaint.setStrokeWidth(0); | |
| boundsPaint.setStyle(SkPaint::kStroke_Style); | |
| canvas->drawRect(bounds, boundsPaint); | |
| Vertex verts[4]; | |
| verts[0].fPosition.setRectFan(bounds.fLeft, bounds.fTop, | |
| bounds.fRight, bounds.fBottom, | |
| sizeof(Vertex)); | |
| GrPathUtils::QuadUVMatrix DevToUV(pts); | |
| DevToUV.apply<4, sizeof(Vertex), sizeof(SkPoint)>(verts); | |
| GrTestTarget tt; | |
| context->getTestTarget(&tt); | |
| SkASSERT(tt.target()); | |
| GrDrawState* drawState = tt.target()->drawState(); | |
| drawState->setVertexAttribs<kAttribs>(2, sizeof(Vertex)); | |
| drawState->setGeometryProcessor(gp); | |
| drawState->setRenderTarget(rt); | |
| drawState->setColor(0xff000000); | |
| tt.target()->setVertexSourceToArray(verts, 4); | |
| tt.target()->setIndexSourceToBuffer(context->getQuadIndexBuffer()); | |
| tt.target()->drawIndexed(kTriangles_GrPrimitiveType, 0, 0, 4, 6); | |
| } | |
| ++col; | |
| if (numCols == col) { | |
| col = 0; | |
| ++row; | |
| } | |
| } | |
| } | |
| } | |
| private: | |
| typedef GM INHERITED; | |
| }; | |
| DEF_GM( return SkNEW(BezierCubicEffects); ) | |
| DEF_GM( return SkNEW(BezierConicEffects); ) | |
| DEF_GM( return SkNEW(BezierQuadEffects); ) | |
| } | |
| #endif |