| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrDashingEffect.h" |
| |
| #include "../GrAARectRenderer.h" |
| |
| #include "GrGeometryProcessor.h" |
| #include "gl/builders/GrGLFullProgramBuilder.h" |
| #include "gl/GrGLProcessor.h" |
| #include "gl/GrGLGeometryProcessor.h" |
| #include "gl/GrGLSL.h" |
| #include "GrContext.h" |
| #include "GrCoordTransform.h" |
| #include "GrDrawTarget.h" |
| #include "GrDrawTargetCaps.h" |
| #include "GrProcessor.h" |
| #include "GrGpu.h" |
| #include "GrStrokeInfo.h" |
| #include "GrTBackendProcessorFactory.h" |
| #include "SkGr.h" |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // Returns whether or not the gpu can fast path the dash line effect. |
| static bool can_fast_path_dash(const SkPoint pts[2], const GrStrokeInfo& strokeInfo, |
| const GrDrawTarget& target, const SkMatrix& viewMatrix) { |
| if (target.getDrawState().getRenderTarget()->isMultisampled()) { |
| return false; |
| } |
| |
| // Pts must be either horizontal or vertical in src space |
| if (pts[0].fX != pts[1].fX && pts[0].fY != pts[1].fY) { |
| return false; |
| } |
| |
| // May be able to relax this to include skew. As of now cannot do perspective |
| // because of the non uniform scaling of bloating a rect |
| if (!viewMatrix.preservesRightAngles()) { |
| return false; |
| } |
| |
| if (!strokeInfo.isDashed() || 2 != strokeInfo.dashCount()) { |
| return false; |
| } |
| |
| const SkPathEffect::DashInfo& info = strokeInfo.getDashInfo(); |
| if (0 == info.fIntervals[0] && 0 == info.fIntervals[1]) { |
| return false; |
| } |
| |
| SkPaint::Cap cap = strokeInfo.getStrokeRec().getCap(); |
| // Current we do don't handle Round or Square cap dashes |
| if (SkPaint::kRound_Cap == cap && info.fIntervals[0] != 0.f) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| namespace { |
| |
| struct DashLineVertex { |
| SkPoint fPos; |
| SkPoint fDashPos; |
| }; |
| |
| extern const GrVertexAttrib gDashLineNoAAVertexAttribs[] = { |
| { kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding } |
| }; |
| |
| extern const GrVertexAttrib gDashLineVertexAttribs[] = { |
| { kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding }, |
| { kVec2f_GrVertexAttribType, sizeof(SkPoint), kGeometryProcessor_GrVertexAttribBinding }, |
| }; |
| |
| }; |
| static void calc_dash_scaling(SkScalar* parallelScale, SkScalar* perpScale, |
| const SkMatrix& viewMatrix, const SkPoint pts[2]) { |
| SkVector vecSrc = pts[1] - pts[0]; |
| SkScalar magSrc = vecSrc.length(); |
| SkScalar invSrc = magSrc ? SkScalarInvert(magSrc) : 0; |
| vecSrc.scale(invSrc); |
| |
| SkVector vecSrcPerp; |
| vecSrc.rotateCW(&vecSrcPerp); |
| viewMatrix.mapVectors(&vecSrc, 1); |
| viewMatrix.mapVectors(&vecSrcPerp, 1); |
| |
| // parallelScale tells how much to scale along the line parallel to the dash line |
| // perpScale tells how much to scale in the direction perpendicular to the dash line |
| *parallelScale = vecSrc.length(); |
| *perpScale = vecSrcPerp.length(); |
| } |
| |
| // calculates the rotation needed to aligned pts to the x axis with pts[0] < pts[1] |
| // Stores the rotation matrix in rotMatrix, and the mapped points in ptsRot |
| static void align_to_x_axis(const SkPoint pts[2], SkMatrix* rotMatrix, SkPoint ptsRot[2] = NULL) { |
| SkVector vec = pts[1] - pts[0]; |
| SkScalar mag = vec.length(); |
| SkScalar inv = mag ? SkScalarInvert(mag) : 0; |
| |
| vec.scale(inv); |
| rotMatrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); |
| if (ptsRot) { |
| rotMatrix->mapPoints(ptsRot, pts, 2); |
| // correction for numerical issues if map doesn't make ptsRot exactly horizontal |
| ptsRot[1].fY = pts[0].fY; |
| } |
| } |
| |
| // Assumes phase < sum of all intervals |
| static SkScalar calc_start_adjustment(const SkPathEffect::DashInfo& info) { |
| SkASSERT(info.fPhase < info.fIntervals[0] + info.fIntervals[1]); |
| if (info.fPhase >= info.fIntervals[0] && info.fPhase != 0) { |
| SkScalar srcIntervalLen = info.fIntervals[0] + info.fIntervals[1]; |
| return srcIntervalLen - info.fPhase; |
| } |
| return 0; |
| } |
| |
| static SkScalar calc_end_adjustment(const SkPathEffect::DashInfo& info, const SkPoint pts[2], |
| SkScalar phase, SkScalar* endingInt) { |
| if (pts[1].fX <= pts[0].fX) { |
| return 0; |
| } |
| SkScalar srcIntervalLen = info.fIntervals[0] + info.fIntervals[1]; |
| SkScalar totalLen = pts[1].fX - pts[0].fX; |
| SkScalar temp = SkScalarDiv(totalLen, srcIntervalLen); |
| SkScalar numFullIntervals = SkScalarFloorToScalar(temp); |
| *endingInt = totalLen - numFullIntervals * srcIntervalLen + phase; |
| temp = SkScalarDiv(*endingInt, srcIntervalLen); |
| *endingInt = *endingInt - SkScalarFloorToScalar(temp) * srcIntervalLen; |
| if (0 == *endingInt) { |
| *endingInt = srcIntervalLen; |
| } |
| if (*endingInt > info.fIntervals[0]) { |
| if (0 == info.fIntervals[0]) { |
| *endingInt -= 0.01f; // make sure we capture the last zero size pnt (used if has caps) |
| } |
| return *endingInt - info.fIntervals[0]; |
| } |
| return 0; |
| } |
| |
| static void setup_dashed_rect(const SkRect& rect, DashLineVertex* verts, int idx, const SkMatrix& matrix, |
| SkScalar offset, SkScalar bloat, SkScalar len, SkScalar stroke) { |
| |
| SkScalar startDashX = offset - bloat; |
| SkScalar endDashX = offset + len + bloat; |
| SkScalar startDashY = -stroke - bloat; |
| SkScalar endDashY = stroke + bloat; |
| verts[idx].fDashPos = SkPoint::Make(startDashX , startDashY); |
| verts[idx + 1].fDashPos = SkPoint::Make(startDashX, endDashY); |
| verts[idx + 2].fDashPos = SkPoint::Make(endDashX, endDashY); |
| verts[idx + 3].fDashPos = SkPoint::Make(endDashX, startDashY); |
| |
| verts[idx].fPos = SkPoint::Make(rect.fLeft, rect.fTop); |
| verts[idx + 1].fPos = SkPoint::Make(rect.fLeft, rect.fBottom); |
| verts[idx + 2].fPos = SkPoint::Make(rect.fRight, rect.fBottom); |
| verts[idx + 3].fPos = SkPoint::Make(rect.fRight, rect.fTop); |
| |
| matrix.mapPointsWithStride(&verts[idx].fPos, sizeof(DashLineVertex), 4); |
| } |
| |
| |
| bool GrDashingEffect::DrawDashLine(const SkPoint pts[2], const GrPaint& paint, |
| const GrStrokeInfo& strokeInfo, GrGpu* gpu, |
| GrDrawTarget* target, const SkMatrix& vm) { |
| |
| if (!can_fast_path_dash(pts, strokeInfo, *target, vm)) { |
| return false; |
| } |
| |
| const SkPathEffect::DashInfo& info = strokeInfo.getDashInfo(); |
| |
| SkPaint::Cap cap = strokeInfo.getStrokeRec().getCap(); |
| |
| SkScalar srcStrokeWidth = strokeInfo.getStrokeRec().getWidth(); |
| |
| // the phase should be normalized to be [0, sum of all intervals) |
| SkASSERT(info.fPhase >= 0 && info.fPhase < info.fIntervals[0] + info.fIntervals[1]); |
| |
| SkScalar srcPhase = info.fPhase; |
| |
| // Rotate the src pts so they are aligned horizontally with pts[0].fX < pts[1].fX |
| SkMatrix srcRotInv; |
| SkPoint ptsRot[2]; |
| if (pts[0].fY != pts[1].fY || pts[0].fX > pts[1].fX) { |
| SkMatrix rotMatrix; |
| align_to_x_axis(pts, &rotMatrix, ptsRot); |
| if(!rotMatrix.invert(&srcRotInv)) { |
| GrPrintf("Failed to create invertible rotation matrix!\n"); |
| return false; |
| } |
| } else { |
| srcRotInv.reset(); |
| memcpy(ptsRot, pts, 2 * sizeof(SkPoint)); |
| } |
| |
| bool useAA = paint.isAntiAlias(); |
| |
| // Scale corrections of intervals and stroke from view matrix |
| SkScalar parallelScale; |
| SkScalar perpScale; |
| calc_dash_scaling(¶llelScale, &perpScale, vm, ptsRot); |
| |
| bool hasCap = SkPaint::kButt_Cap != cap && 0 != srcStrokeWidth; |
| |
| // We always want to at least stroke out half a pixel on each side in device space |
| // so 0.5f / perpScale gives us this min in src space |
| SkScalar halfSrcStroke = SkMaxScalar(srcStrokeWidth * 0.5f, 0.5f / perpScale); |
| |
| SkScalar strokeAdj; |
| if (!hasCap) { |
| strokeAdj = 0.f; |
| } else { |
| strokeAdj = halfSrcStroke; |
| } |
| |
| SkScalar startAdj = 0; |
| |
| SkMatrix combinedMatrix = srcRotInv; |
| combinedMatrix.postConcat(vm); |
| |
| bool lineDone = false; |
| SkRect startRect; |
| bool hasStartRect = false; |
| // If we are using AA, check to see if we are drawing a partial dash at the start. If so |
| // draw it separately here and adjust our start point accordingly |
| if (useAA) { |
| if (srcPhase > 0 && srcPhase < info.fIntervals[0]) { |
| SkPoint startPts[2]; |
| startPts[0] = ptsRot[0]; |
| startPts[1].fY = startPts[0].fY; |
| startPts[1].fX = SkMinScalar(startPts[0].fX + info.fIntervals[0] - srcPhase, |
| ptsRot[1].fX); |
| startRect.set(startPts, 2); |
| startRect.outset(strokeAdj, halfSrcStroke); |
| |
| hasStartRect = true; |
| startAdj = info.fIntervals[0] + info.fIntervals[1] - srcPhase; |
| } |
| } |
| |
| // adjustments for start and end of bounding rect so we only draw dash intervals |
| // contained in the original line segment. |
| startAdj += calc_start_adjustment(info); |
| if (startAdj != 0) { |
| ptsRot[0].fX += startAdj; |
| srcPhase = 0; |
| } |
| SkScalar endingInterval = 0; |
| SkScalar endAdj = calc_end_adjustment(info, ptsRot, srcPhase, &endingInterval); |
| ptsRot[1].fX -= endAdj; |
| if (ptsRot[0].fX >= ptsRot[1].fX) { |
| lineDone = true; |
| } |
| |
| SkRect endRect; |
| bool hasEndRect = false; |
| // If we are using AA, check to see if we are drawing a partial dash at then end. If so |
| // draw it separately here and adjust our end point accordingly |
| if (useAA && !lineDone) { |
| // If we adjusted the end then we will not be drawing a partial dash at the end. |
| // If we didn't adjust the end point then we just need to make sure the ending |
| // dash isn't a full dash |
| if (0 == endAdj && endingInterval != info.fIntervals[0]) { |
| SkPoint endPts[2]; |
| endPts[1] = ptsRot[1]; |
| endPts[0].fY = endPts[1].fY; |
| endPts[0].fX = endPts[1].fX - endingInterval; |
| |
| endRect.set(endPts, 2); |
| endRect.outset(strokeAdj, halfSrcStroke); |
| |
| hasEndRect = true; |
| endAdj = endingInterval + info.fIntervals[1]; |
| |
| ptsRot[1].fX -= endAdj; |
| if (ptsRot[0].fX >= ptsRot[1].fX) { |
| lineDone = true; |
| } |
| } |
| } |
| |
| if (startAdj != 0) { |
| srcPhase = 0; |
| } |
| |
| // Change the dashing info from src space into device space |
| SkScalar devIntervals[2]; |
| devIntervals[0] = info.fIntervals[0] * parallelScale; |
| devIntervals[1] = info.fIntervals[1] * parallelScale; |
| SkScalar devPhase = srcPhase * parallelScale; |
| SkScalar strokeWidth = srcStrokeWidth * perpScale; |
| |
| if ((strokeWidth < 1.f && !useAA) || 0.f == strokeWidth) { |
| strokeWidth = 1.f; |
| } |
| |
| SkScalar halfDevStroke = strokeWidth * 0.5f; |
| |
| if (SkPaint::kSquare_Cap == cap && 0 != srcStrokeWidth) { |
| // add cap to on interveal and remove from off interval |
| devIntervals[0] += strokeWidth; |
| devIntervals[1] -= strokeWidth; |
| } |
| SkScalar startOffset = devIntervals[1] * 0.5f + devPhase; |
| |
| SkScalar bloatX = useAA ? 0.5f / parallelScale : 0.f; |
| SkScalar bloatY = useAA ? 0.5f / perpScale : 0.f; |
| |
| SkScalar devBloat = useAA ? 0.5f : 0.f; |
| |
| GrDrawState* drawState = target->drawState(); |
| if (devIntervals[1] <= 0.f && useAA) { |
| // Case when we end up drawing a solid AA rect |
| // Reset the start rect to draw this single solid rect |
| // but it requires to upload a new intervals uniform so we can mimic |
| // one giant dash |
| ptsRot[0].fX -= hasStartRect ? startAdj : 0; |
| ptsRot[1].fX += hasEndRect ? endAdj : 0; |
| startRect.set(ptsRot, 2); |
| startRect.outset(strokeAdj, halfSrcStroke); |
| hasStartRect = true; |
| hasEndRect = false; |
| lineDone = true; |
| |
| SkPoint devicePts[2]; |
| vm.mapPoints(devicePts, ptsRot, 2); |
| SkScalar lineLength = SkPoint::Distance(devicePts[0], devicePts[1]); |
| if (hasCap) { |
| lineLength += 2.f * halfDevStroke; |
| } |
| devIntervals[0] = lineLength; |
| } |
| if (devIntervals[1] > 0.f || useAA) { |
| SkPathEffect::DashInfo devInfo; |
| devInfo.fPhase = devPhase; |
| devInfo.fCount = 2; |
| devInfo.fIntervals = devIntervals; |
| GrPrimitiveEdgeType edgeType= useAA ? kFillAA_GrProcessorEdgeType : |
| kFillBW_GrProcessorEdgeType; |
| bool isRoundCap = SkPaint::kRound_Cap == cap; |
| GrDashingEffect::DashCap capType = isRoundCap ? GrDashingEffect::kRound_DashCap : |
| GrDashingEffect::kNonRound_DashCap; |
| drawState->setGeometryProcessor( |
| GrDashingEffect::Create(edgeType, devInfo, strokeWidth, capType))->unref(); |
| |
| // Set up the vertex data for the line and start/end dashes |
| drawState->setVertexAttribs<gDashLineVertexAttribs>(SK_ARRAY_COUNT(gDashLineVertexAttribs), |
| sizeof(DashLineVertex)); |
| } else { |
| // Set up the vertex data for the line and start/end dashes |
| drawState->setVertexAttribs<gDashLineNoAAVertexAttribs>( |
| SK_ARRAY_COUNT(gDashLineNoAAVertexAttribs), sizeof(DashLineVertex)); |
| } |
| |
| int totalRectCnt = 0; |
| |
| totalRectCnt += !lineDone ? 1 : 0; |
| totalRectCnt += hasStartRect ? 1 : 0; |
| totalRectCnt += hasEndRect ? 1 : 0; |
| |
| GrDrawTarget::AutoReleaseGeometry geo(target, totalRectCnt * 4, 0); |
| if (!geo.succeeded()) { |
| GrPrintf("Failed to get space for vertices!\n"); |
| return false; |
| } |
| |
| DashLineVertex* verts = reinterpret_cast<DashLineVertex*>(geo.vertices()); |
| |
| int curVIdx = 0; |
| |
| if (SkPaint::kRound_Cap == cap && 0 != srcStrokeWidth) { |
| // need to adjust this for round caps to correctly set the dashPos attrib on vertices |
| startOffset -= halfDevStroke; |
| } |
| |
| // Draw interior part of dashed line |
| if (!lineDone) { |
| SkPoint devicePts[2]; |
| vm.mapPoints(devicePts, ptsRot, 2); |
| SkScalar lineLength = SkPoint::Distance(devicePts[0], devicePts[1]); |
| if (hasCap) { |
| lineLength += 2.f * halfDevStroke; |
| } |
| |
| SkRect bounds; |
| bounds.set(ptsRot[0].fX, ptsRot[0].fY, ptsRot[1].fX, ptsRot[1].fY); |
| bounds.outset(bloatX + strokeAdj, bloatY + halfSrcStroke); |
| setup_dashed_rect(bounds, verts, curVIdx, combinedMatrix, startOffset, devBloat, |
| lineLength, halfDevStroke); |
| curVIdx += 4; |
| } |
| |
| if (hasStartRect) { |
| SkASSERT(useAA); // so that we know bloatX and bloatY have been set |
| startRect.outset(bloatX, bloatY); |
| setup_dashed_rect(startRect, verts, curVIdx, combinedMatrix, startOffset, devBloat, |
| devIntervals[0], halfDevStroke); |
| curVIdx += 4; |
| } |
| |
| if (hasEndRect) { |
| SkASSERT(useAA); // so that we know bloatX and bloatY have been set |
| endRect.outset(bloatX, bloatY); |
| setup_dashed_rect(endRect, verts, curVIdx, combinedMatrix, startOffset, devBloat, |
| devIntervals[0], halfDevStroke); |
| } |
| |
| target->setIndexSourceToBuffer(gpu->getContext()->getQuadIndexBuffer()); |
| target->drawIndexedInstances(kTriangles_GrPrimitiveType, totalRectCnt, 4, 6); |
| target->resetIndexSource(); |
| return true; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| class GLDashingCircleEffect; |
| /* |
| * This effect will draw a dotted line (defined as a dashed lined with round caps and no on |
| * interval). The radius of the dots is given by the strokeWidth and the spacing by the DashInfo. |
| * Both of the previous two parameters are in device space. This effect also requires the setting of |
| * a vec2 vertex attribute for the the four corners of the bounding rect. This attribute is the |
| * "dash position" of each vertex. In other words it is the vertex coords (in device space) if we |
| * transform the line to be horizontal, with the start of line at the origin then shifted to the |
| * right by half the off interval. The line then goes in the positive x direction. |
| */ |
| class DashingCircleEffect : public GrGeometryProcessor { |
| public: |
| typedef SkPathEffect::DashInfo DashInfo; |
| |
| static GrGeometryProcessor* Create(GrPrimitiveEdgeType edgeType, |
| const DashInfo& info, |
| SkScalar radius); |
| |
| virtual ~DashingCircleEffect(); |
| |
| static const char* Name() { return "DashingCircleEffect"; } |
| |
| const GrShaderVar& inCoord() const { return fInCoord; } |
| |
| GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } |
| |
| SkScalar getRadius() const { return fRadius; } |
| |
| SkScalar getCenterX() const { return fCenterX; } |
| |
| SkScalar getIntervalLength() const { return fIntervalLength; } |
| |
| typedef GLDashingCircleEffect GLProcessor; |
| |
| virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; |
| |
| virtual const GrBackendGeometryProcessorFactory& getFactory() const SK_OVERRIDE; |
| |
| private: |
| DashingCircleEffect(GrPrimitiveEdgeType edgeType, const DashInfo& info, SkScalar radius); |
| |
| virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE; |
| |
| GrPrimitiveEdgeType fEdgeType; |
| const GrShaderVar& fInCoord; |
| SkScalar fIntervalLength; |
| SkScalar fRadius; |
| SkScalar fCenterX; |
| |
| GR_DECLARE_GEOMETRY_PROCESSOR_TEST; |
| |
| typedef GrGeometryProcessor INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| class GLDashingCircleEffect : public GrGLGeometryProcessor { |
| public: |
| GLDashingCircleEffect(const GrBackendProcessorFactory&, const GrProcessor&); |
| |
| virtual void emitCode(GrGLFullProgramBuilder* builder, |
| const GrGeometryProcessor& geometryProcessor, |
| const GrProcessorKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| |
| static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder*); |
| |
| virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE; |
| |
| private: |
| GrGLProgramDataManager::UniformHandle fParamUniform; |
| SkScalar fPrevRadius; |
| SkScalar fPrevCenterX; |
| SkScalar fPrevIntervalLength; |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| GLDashingCircleEffect::GLDashingCircleEffect(const GrBackendProcessorFactory& factory, |
| const GrProcessor&) |
| : INHERITED (factory) { |
| fPrevRadius = SK_ScalarMin; |
| fPrevCenterX = SK_ScalarMin; |
| fPrevIntervalLength = SK_ScalarMax; |
| } |
| |
| void GLDashingCircleEffect::emitCode(GrGLFullProgramBuilder* builder, |
| const GrGeometryProcessor& geometryProcessor, |
| const GrProcessorKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray& samplers) { |
| const DashingCircleEffect& dce = geometryProcessor.cast<DashingCircleEffect>(); |
| const char *paramName; |
| // The param uniforms, xyz, refer to circle radius - 0.5, cicles center x coord, and |
| // the total interval length of the dash. |
| fParamUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec3f_GrSLType, |
| "params", |
| ¶mName); |
| |
| const char *vsCoordName, *fsCoordName; |
| builder->addVarying(kVec2f_GrSLType, "Coord", &vsCoordName, &fsCoordName); |
| |
| GrGLVertexShaderBuilder* vsBuilder = builder->getVertexShaderBuilder(); |
| vsBuilder->codeAppendf("\t%s = %s;\n", vsCoordName, dce.inCoord().c_str()); |
| |
| // transforms all points so that we can compare them to our test circle |
| GrGLProcessorFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
| fsBuilder->codeAppendf("\t\tfloat xShifted = %s.x - floor(%s.x / %s.z) * %s.z;\n", |
| fsCoordName, fsCoordName, paramName, paramName); |
| fsBuilder->codeAppendf("\t\tvec2 fragPosShifted = vec2(xShifted, %s.y);\n", fsCoordName); |
| fsBuilder->codeAppendf("\t\tvec2 center = vec2(%s.y, 0.0);\n", paramName); |
| fsBuilder->codeAppend("\t\tfloat dist = length(center - fragPosShifted);\n"); |
| if (GrProcessorEdgeTypeIsAA(dce.getEdgeType())) { |
| fsBuilder->codeAppendf("\t\tfloat diff = dist - %s.x;\n", paramName); |
| fsBuilder->codeAppend("\t\tdiff = 1.0 - diff;\n"); |
| fsBuilder->codeAppend("\t\tfloat alpha = clamp(diff, 0.0, 1.0);\n"); |
| } else { |
| fsBuilder->codeAppendf("\t\tfloat alpha = 1.0;\n"); |
| fsBuilder->codeAppendf("\t\talpha *= dist < %s.x + 0.5 ? 1.0 : 0.0;\n", paramName); |
| } |
| fsBuilder->codeAppendf("\t\t%s = %s;\n", outputColor, |
| (GrGLSLExpr4(inputColor) * GrGLSLExpr1("alpha")).c_str()); |
| } |
| |
| void GLDashingCircleEffect::setData(const GrGLProgramDataManager& pdman |
| , const GrProcessor& processor) { |
| const DashingCircleEffect& dce = processor.cast<DashingCircleEffect>(); |
| SkScalar radius = dce.getRadius(); |
| SkScalar centerX = dce.getCenterX(); |
| SkScalar intervalLength = dce.getIntervalLength(); |
| if (radius != fPrevRadius || centerX != fPrevCenterX || intervalLength != fPrevIntervalLength) { |
| pdman.set3f(fParamUniform, radius - 0.5f, centerX, intervalLength); |
| fPrevRadius = radius; |
| fPrevCenterX = centerX; |
| fPrevIntervalLength = intervalLength; |
| } |
| } |
| |
| void GLDashingCircleEffect::GenKey(const GrProcessor& processor, const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const DashingCircleEffect& dce = processor.cast<DashingCircleEffect>(); |
| b->add32(dce.getEdgeType()); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| GrGeometryProcessor* DashingCircleEffect::Create(GrPrimitiveEdgeType edgeType, const DashInfo& info, |
| SkScalar radius) { |
| if (info.fCount != 2 || info.fIntervals[0] != 0) { |
| return NULL; |
| } |
| |
| return SkNEW_ARGS(DashingCircleEffect, (edgeType, info, radius)); |
| } |
| |
| DashingCircleEffect::~DashingCircleEffect() {} |
| |
| void DashingCircleEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { |
| *validFlags = 0; |
| } |
| |
| const GrBackendGeometryProcessorFactory& DashingCircleEffect::getFactory() const { |
| return GrTBackendGeometryProcessorFactory<DashingCircleEffect>::getInstance(); |
| } |
| |
| DashingCircleEffect::DashingCircleEffect(GrPrimitiveEdgeType edgeType, const DashInfo& info, |
| SkScalar radius) |
| : fEdgeType(edgeType) |
| , fInCoord(this->addVertexAttrib(GrShaderVar("inCoord", |
| kVec2f_GrSLType, |
| GrShaderVar::kAttribute_TypeModifier))) { |
| SkScalar onLen = info.fIntervals[0]; |
| SkScalar offLen = info.fIntervals[1]; |
| fIntervalLength = onLen + offLen; |
| fRadius = radius; |
| fCenterX = SkScalarHalf(offLen); |
| } |
| |
| bool DashingCircleEffect::onIsEqual(const GrProcessor& other) const { |
| const DashingCircleEffect& dce = other.cast<DashingCircleEffect>(); |
| return (fEdgeType == dce.fEdgeType && |
| fIntervalLength == dce.fIntervalLength && |
| fRadius == dce.fRadius && |
| fCenterX == dce.fCenterX); |
| } |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DashingCircleEffect); |
| |
| GrGeometryProcessor* DashingCircleEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps& caps, |
| GrTexture*[]) { |
| GrPrimitiveEdgeType edgeType = static_cast<GrPrimitiveEdgeType>(random->nextULessThan( |
| kGrProcessorEdgeTypeCnt)); |
| SkScalar strokeWidth = random->nextRangeScalar(0, 100.f); |
| DashInfo info; |
| info.fCount = 2; |
| SkAutoTArray<SkScalar> intervals(info.fCount); |
| info.fIntervals = intervals.get(); |
| info.fIntervals[0] = 0; |
| info.fIntervals[1] = random->nextRangeScalar(0, 10.f); |
| info.fPhase = random->nextRangeScalar(0, info.fIntervals[1]); |
| |
| return DashingCircleEffect::Create(edgeType, info, strokeWidth); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| class GLDashingLineEffect; |
| |
| /* |
| * This effect will draw a dashed line. The width of the dash is given by the strokeWidth and the |
| * length and spacing by the DashInfo. Both of the previous two parameters are in device space. |
| * This effect also requires the setting of a vec2 vertex attribute for the the four corners of the |
| * bounding rect. This attribute is the "dash position" of each vertex. In other words it is the |
| * vertex coords (in device space) if we transform the line to be horizontal, with the start of |
| * line at the origin then shifted to the right by half the off interval. The line then goes in the |
| * positive x direction. |
| */ |
| class DashingLineEffect : public GrGeometryProcessor { |
| public: |
| typedef SkPathEffect::DashInfo DashInfo; |
| |
| static GrGeometryProcessor* Create(GrPrimitiveEdgeType edgeType, |
| const DashInfo& info, |
| SkScalar strokeWidth); |
| |
| virtual ~DashingLineEffect(); |
| |
| static const char* Name() { return "DashingEffect"; } |
| |
| const GrShaderVar& inCoord() const { return fInCoord; } |
| |
| GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } |
| |
| const SkRect& getRect() const { return fRect; } |
| |
| SkScalar getIntervalLength() const { return fIntervalLength; } |
| |
| typedef GLDashingLineEffect GLProcessor; |
| |
| virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; |
| |
| virtual const GrBackendGeometryProcessorFactory& getFactory() const SK_OVERRIDE; |
| |
| private: |
| DashingLineEffect(GrPrimitiveEdgeType edgeType, const DashInfo& info, SkScalar strokeWidth); |
| |
| virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE; |
| |
| GrPrimitiveEdgeType fEdgeType; |
| const GrShaderVar& fInCoord; |
| SkRect fRect; |
| SkScalar fIntervalLength; |
| |
| GR_DECLARE_GEOMETRY_PROCESSOR_TEST; |
| |
| typedef GrGeometryProcessor INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| class GLDashingLineEffect : public GrGLGeometryProcessor { |
| public: |
| GLDashingLineEffect(const GrBackendProcessorFactory&, const GrProcessor&); |
| |
| virtual void emitCode(GrGLFullProgramBuilder* builder, |
| const GrGeometryProcessor& geometryProcessor, |
| const GrProcessorKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| |
| static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder*); |
| |
| virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE; |
| |
| private: |
| GrGLProgramDataManager::UniformHandle fRectUniform; |
| GrGLProgramDataManager::UniformHandle fIntervalUniform; |
| SkRect fPrevRect; |
| SkScalar fPrevIntervalLength; |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| GLDashingLineEffect::GLDashingLineEffect(const GrBackendProcessorFactory& factory, |
| const GrProcessor&) |
| : INHERITED (factory) { |
| fPrevRect.fLeft = SK_ScalarNaN; |
| fPrevIntervalLength = SK_ScalarMax; |
| } |
| |
| void GLDashingLineEffect::emitCode(GrGLFullProgramBuilder* builder, |
| const GrGeometryProcessor& geometryProcessor, |
| const GrProcessorKey& key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray& samplers) { |
| const DashingLineEffect& de = geometryProcessor.cast<DashingLineEffect>(); |
| const char *rectName; |
| // The rect uniform's xyzw refer to (left + 0.5, top + 0.5, right - 0.5, bottom - 0.5), |
| // respectively. |
| fRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec4f_GrSLType, |
| "rect", |
| &rectName); |
| const char *intervalName; |
| // The interval uniform's refers to the total length of the interval (on + off) |
| fIntervalUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, |
| "interval", |
| &intervalName); |
| |
| const char *vsCoordName, *fsCoordName; |
| builder->addVarying(kVec2f_GrSLType, "Coord", &vsCoordName, &fsCoordName); |
| GrGLVertexShaderBuilder* vsBuilder = builder->getVertexShaderBuilder(); |
| vsBuilder->codeAppendf("\t%s = %s;\n", vsCoordName, de.inCoord().c_str()); |
| |
| // transforms all points so that we can compare them to our test rect |
| GrGLProcessorFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
| fsBuilder->codeAppendf("\t\tfloat xShifted = %s.x - floor(%s.x / %s) * %s;\n", |
| fsCoordName, fsCoordName, intervalName, intervalName); |
| fsBuilder->codeAppendf("\t\tvec2 fragPosShifted = vec2(xShifted, %s.y);\n", fsCoordName); |
| if (GrProcessorEdgeTypeIsAA(de.getEdgeType())) { |
| // The amount of coverage removed in x and y by the edges is computed as a pair of negative |
| // numbers, xSub and ySub. |
| fsBuilder->codeAppend("\t\tfloat xSub, ySub;\n"); |
| fsBuilder->codeAppendf("\t\txSub = min(fragPosShifted.x - %s.x, 0.0);\n", rectName); |
| fsBuilder->codeAppendf("\t\txSub += min(%s.z - fragPosShifted.x, 0.0);\n", rectName); |
| fsBuilder->codeAppendf("\t\tySub = min(fragPosShifted.y - %s.y, 0.0);\n", rectName); |
| fsBuilder->codeAppendf("\t\tySub += min(%s.w - fragPosShifted.y, 0.0);\n", rectName); |
| // Now compute coverage in x and y and multiply them to get the fraction of the pixel |
| // covered. |
| fsBuilder->codeAppendf("\t\tfloat alpha = (1.0 + max(xSub, -1.0)) * (1.0 + max(ySub, -1.0));\n"); |
| } else { |
| // Assuming the bounding geometry is tight so no need to check y values |
| fsBuilder->codeAppendf("\t\tfloat alpha = 1.0;\n"); |
| fsBuilder->codeAppendf("\t\talpha *= (fragPosShifted.x - %s.x) > -0.5 ? 1.0 : 0.0;\n", rectName); |
| fsBuilder->codeAppendf("\t\talpha *= (%s.z - fragPosShifted.x) >= -0.5 ? 1.0 : 0.0;\n", rectName); |
| } |
| fsBuilder->codeAppendf("\t\t%s = %s;\n", outputColor, |
| (GrGLSLExpr4(inputColor) * GrGLSLExpr1("alpha")).c_str()); |
| } |
| |
| void GLDashingLineEffect::setData(const GrGLProgramDataManager& pdman, |
| const GrProcessor& processor) { |
| const DashingLineEffect& de = processor.cast<DashingLineEffect>(); |
| const SkRect& rect = de.getRect(); |
| SkScalar intervalLength = de.getIntervalLength(); |
| if (rect != fPrevRect || intervalLength != fPrevIntervalLength) { |
| pdman.set4f(fRectUniform, rect.fLeft + 0.5f, rect.fTop + 0.5f, |
| rect.fRight - 0.5f, rect.fBottom - 0.5f); |
| pdman.set1f(fIntervalUniform, intervalLength); |
| fPrevRect = rect; |
| fPrevIntervalLength = intervalLength; |
| } |
| } |
| |
| void GLDashingLineEffect::GenKey(const GrProcessor& processor, const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const DashingLineEffect& de = processor.cast<DashingLineEffect>(); |
| b->add32(de.getEdgeType()); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| GrGeometryProcessor* DashingLineEffect::Create(GrPrimitiveEdgeType edgeType, |
| const DashInfo& info, |
| SkScalar strokeWidth) { |
| if (info.fCount != 2) { |
| return NULL; |
| } |
| |
| return SkNEW_ARGS(DashingLineEffect, (edgeType, info, strokeWidth)); |
| } |
| |
| DashingLineEffect::~DashingLineEffect() {} |
| |
| void DashingLineEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { |
| *validFlags = 0; |
| } |
| |
| const GrBackendGeometryProcessorFactory& DashingLineEffect::getFactory() const { |
| return GrTBackendGeometryProcessorFactory<DashingLineEffect>::getInstance(); |
| } |
| |
| DashingLineEffect::DashingLineEffect(GrPrimitiveEdgeType edgeType, const DashInfo& info, |
| SkScalar strokeWidth) |
| : fEdgeType(edgeType) |
| , fInCoord(this->addVertexAttrib(GrShaderVar("inCoord", |
| kVec2f_GrSLType, |
| GrShaderVar::kAttribute_TypeModifier))) { |
| SkScalar onLen = info.fIntervals[0]; |
| SkScalar offLen = info.fIntervals[1]; |
| SkScalar halfOffLen = SkScalarHalf(offLen); |
| SkScalar halfStroke = SkScalarHalf(strokeWidth); |
| fIntervalLength = onLen + offLen; |
| fRect.set(halfOffLen, -halfStroke, halfOffLen + onLen, halfStroke); |
| } |
| |
| bool DashingLineEffect::onIsEqual(const GrProcessor& other) const { |
| const DashingLineEffect& de = other.cast<DashingLineEffect>(); |
| return (fEdgeType == de.fEdgeType && |
| fRect == de.fRect && |
| fIntervalLength == de.fIntervalLength); |
| } |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DashingLineEffect); |
| |
| GrGeometryProcessor* DashingLineEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps& caps, |
| GrTexture*[]) { |
| GrPrimitiveEdgeType edgeType = static_cast<GrPrimitiveEdgeType>(random->nextULessThan( |
| kGrProcessorEdgeTypeCnt)); |
| SkScalar strokeWidth = random->nextRangeScalar(0, 100.f); |
| DashInfo info; |
| info.fCount = 2; |
| SkAutoTArray<SkScalar> intervals(info.fCount); |
| info.fIntervals = intervals.get(); |
| info.fIntervals[0] = random->nextRangeScalar(0, 10.f); |
| info.fIntervals[1] = random->nextRangeScalar(0, 10.f); |
| info.fPhase = random->nextRangeScalar(0, info.fIntervals[0] + info.fIntervals[1]); |
| |
| return DashingLineEffect::Create(edgeType, info, strokeWidth); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| GrGeometryProcessor* GrDashingEffect::Create(GrPrimitiveEdgeType edgeType, |
| const SkPathEffect::DashInfo& info, |
| SkScalar strokeWidth, |
| GrDashingEffect::DashCap cap) { |
| switch (cap) { |
| case GrDashingEffect::kRound_DashCap: |
| return DashingCircleEffect::Create(edgeType, info, SkScalarHalf(strokeWidth)); |
| case GrDashingEffect::kNonRound_DashCap: |
| return DashingLineEffect::Create(edgeType, info, strokeWidth); |
| default: |
| SkFAIL("Unexpected dashed cap."); |
| } |
| return NULL; |
| } |
