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