| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkColorPriv.h" |
| #include "include/core/SkContourMeasure.h" |
| #include "include/core/SkGraphics.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkRegion.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkStream.h" |
| #include "include/core/SkTime.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/core/SkVertices.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/effects/SkOpPathEffect.h" |
| #include "include/private/SkTDArray.h" |
| #include "include/utils/SkRandom.h" |
| #include "samplecode/DecodeFile.h" |
| #include "samplecode/Sample.h" |
| #include "src/core/SkGeometry.h" |
| #include "src/core/SkOSFile.h" |
| #include "src/utils/SkUTF.h" |
| #include "tools/Resources.h" |
| #include "tools/timer/TimeUtils.h" |
| |
| namespace { |
| static sk_sp<SkShader> make_shader0(SkIPoint* size) { |
| SkBitmap bm; |
| decode_file(GetResourceAsData("images/dog.jpg"), &bm); |
| *size = SkIPoint{bm.width(), bm.height()}; |
| return bm.makeShader(); |
| } |
| |
| static sk_sp<SkShader> make_shader1(const SkIPoint& size) { |
| SkPoint pts[] = { { 0, 0, }, |
| { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } }; |
| SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED }; |
| return SkGradientShader::MakeLinear(pts, colors, nullptr, |
| SK_ARRAY_COUNT(colors), SkTileMode::kMirror); |
| } |
| |
| class Patch { |
| public: |
| Patch() { sk_bzero(fPts, sizeof(fPts)); } |
| ~Patch() {} |
| |
| void setPatch(const SkPoint pts[12]) { |
| memcpy(fPts, pts, 12 * sizeof(SkPoint)); |
| fPts[12] = pts[0]; // the last shall be first |
| } |
| void setBounds(int w, int h) { fW = w; fH = h; } |
| |
| void draw(SkCanvas*, const SkPaint&, int segsU, int segsV, |
| bool doTextures, bool doColors); |
| |
| private: |
| SkPoint fPts[13]; |
| int fW, fH; |
| }; |
| |
| static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) { |
| SkScalar t = 0; |
| SkScalar dt = SK_Scalar1 / segs; |
| |
| samples[0] = cubic[0]; |
| for (int i = 1; i < segs; i++) { |
| t += dt; |
| SkEvalCubicAt(cubic, t, &samples[i], nullptr, nullptr); |
| } |
| } |
| |
| static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv, |
| SkPoint* pt) { |
| const int TL = 0; |
| const int TR = nu; |
| const int BR = TR + nv; |
| const int BL = BR + nu; |
| |
| SkScalar u = SkIntToScalar(iu) / nu; |
| SkScalar v = SkIntToScalar(iv) / nv; |
| |
| SkScalar uv = u * v; |
| SkScalar Uv = (1 - u) * v; |
| SkScalar uV = u * (1 - v); |
| SkScalar UV = (1 - u) * (1 - v); |
| |
| SkScalar x0 = UV * edge[TL].fX + uV * edge[TR].fX + Uv * edge[BL].fX + uv * edge[BR].fX; |
| SkScalar y0 = UV * edge[TL].fY + uV * edge[TR].fY + Uv * edge[BL].fY + uv * edge[BR].fY; |
| |
| SkScalar x = (1 - v) * edge[TL+iu].fX + u * edge[TR+iv].fX + |
| v * edge[BR+nu-iu].fX + (1 - u) * edge[BL+nv-iv].fX - x0; |
| SkScalar y = (1 - v) * edge[TL+iu].fY + u * edge[TR+iv].fY + |
| v * edge[BR+nu-iu].fY + (1 - u) * edge[BL+nv-iv].fY - y0; |
| pt->set(x, y); |
| } |
| |
| static SkColor make_color(SkScalar s, SkScalar t) { |
| return SkColorSetARGB(0xFF, SkUnitScalarClampToByte(s), SkUnitScalarClampToByte(t), 0); |
| } |
| |
| void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, |
| bool doTextures, bool doColors) { |
| if (nu < 1 || nv < 1) { |
| return; |
| } |
| |
| int i, npts = (nu + nv) * 2; |
| SkAutoSTMalloc<16, SkPoint> storage(npts + 1); |
| SkPoint* edge0 = storage.get(); |
| SkPoint* edge1 = edge0 + nu; |
| SkPoint* edge2 = edge1 + nv; |
| SkPoint* edge3 = edge2 + nu; |
| |
| // evaluate the edge points |
| eval_patch_edge(fPts + 0, edge0, nu); |
| eval_patch_edge(fPts + 3, edge1, nv); |
| eval_patch_edge(fPts + 6, edge2, nu); |
| eval_patch_edge(fPts + 9, edge3, nv); |
| edge3[nv] = edge0[0]; // the last shall be first |
| |
| for (i = 0; i < npts; i++) { |
| // canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint); |
| } |
| |
| int row, vertCount = (nu + 1) * (nv + 1); |
| SkAutoTMalloc<SkPoint> vertStorage(vertCount); |
| SkPoint* verts = vertStorage.get(); |
| |
| // first row |
| memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint)); |
| // rows |
| SkPoint* r = verts; |
| for (row = 1; row < nv; row++) { |
| r += nu + 1; |
| r[0] = edge3[nv - row]; |
| for (int col = 1; col < nu; col++) { |
| eval_sheet(edge0, nu, nv, col, row, &r[col]); |
| } |
| r[nu] = edge1[row]; |
| } |
| // last row |
| SkPoint* last = verts + nv * (nu + 1); |
| for (i = 0; i <= nu; i++) { |
| last[i] = edge2[nu - i]; |
| } |
| |
| // canvas->drawPoints(verts, vertCount, paint); |
| |
| int stripCount = (nu + 1) * 2; |
| SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2); |
| SkAutoTMalloc<SkColor> colorStorage(stripCount); |
| SkPoint* strip = stripStorage.get(); |
| SkPoint* tex = strip + stripCount; |
| SkColor* colors = colorStorage.get(); |
| SkScalar t = 0; |
| const SkScalar ds = SK_Scalar1 * fW / nu; |
| const SkScalar dt = SK_Scalar1 * fH / nv; |
| r = verts; |
| for (row = 0; row < nv; row++) { |
| SkPoint* upper = r; |
| SkPoint* lower = r + nu + 1; |
| r = lower; |
| SkScalar s = 0; |
| for (i = 0; i <= nu; i++) { |
| strip[i*2 + 0] = *upper++; |
| strip[i*2 + 1] = *lower++; |
| tex[i*2 + 0].set(s, t); |
| tex[i*2 + 1].set(s, t + dt); |
| colors[i*2 + 0] = make_color(s/fW, t/fH); |
| colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH); |
| s += ds; |
| } |
| t += dt; |
| canvas->drawVertices(SkVertices::MakeCopy(SkVertices::kTriangleStrip_VertexMode, stripCount, |
| strip, doTextures ? tex : nullptr, |
| doColors ? colors : nullptr), |
| SkBlendMode::kModulate, paint); |
| } |
| } |
| |
| static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, |
| Patch* patch) { |
| SkAutoCanvasRestore ar(canvas, true); |
| |
| patch->draw(canvas, paint, nu, nv, false, false); |
| canvas->translate(SkIntToScalar(180), 0); |
| patch->draw(canvas, paint, nu, nv, true, false); |
| canvas->translate(SkIntToScalar(180), 0); |
| patch->draw(canvas, paint, nu, nv, false, true); |
| canvas->translate(SkIntToScalar(180), 0); |
| patch->draw(canvas, paint, nu, nv, true, true); |
| } |
| |
| static constexpr SkScalar DX = 20; |
| static constexpr SkScalar DY = 0; |
| static constexpr SkScalar kS = 50; |
| static constexpr SkScalar kT = 40; |
| |
| struct PatchView : public Sample { |
| sk_sp<SkShader> fShader0; |
| sk_sp<SkShader> fShader1; |
| SkScalar fAngle = 0; |
| SkIPoint fSize0 = {0, 0}, |
| fSize1 = {0, 0}; |
| SkPoint fPts[12] = { |
| {kS * 0, kT * 1}, |
| {kS * 1, kT * 1}, |
| {kS * 2, kT * 1}, |
| {kS * 3, kT * 1}, |
| {kS * 3, kT * 2}, |
| {kS * 3, kT * 3}, |
| {kS * 3, kT * 4}, |
| {kS * 2, kT * 4}, |
| {kS * 1, kT * 4}, |
| {kS * 0, kT * 4}, |
| {kS * 0, kT * 3}, |
| {kS * 0, kT * 2}, |
| }; |
| |
| void onOnceBeforeDraw() override { |
| fShader0 = make_shader0(&fSize0); |
| fSize1 = fSize0; |
| if (fSize0.fX == 0 || fSize0.fY == 0) { |
| fSize1.set(2, 2); |
| } |
| fShader1 = make_shader1(fSize1); |
| this->setBGColor(SK_ColorGRAY); |
| } |
| |
| SkString name() override { return SkString("Patch"); } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| const int nu = 10; |
| const int nv = 10; |
| |
| SkPaint paint; |
| paint.setDither(true); |
| paint.setFilterQuality(kLow_SkFilterQuality); |
| |
| canvas->translate(DX, DY); |
| |
| Patch patch; |
| |
| paint.setShader(fShader0); |
| if (fSize0.fX == 0) { |
| fSize0.fX = 1; |
| } |
| if (fSize0.fY == 0) { |
| fSize0.fY = 1; |
| } |
| patch.setBounds(fSize0.fX, fSize0.fY); |
| |
| patch.setPatch(fPts); |
| drawpatches(canvas, paint, nu, nv, &patch); |
| |
| paint.setShader(nullptr); |
| paint.setAntiAlias(true); |
| paint.setStrokeWidth(SkIntToScalar(5)); |
| canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint); |
| |
| canvas->translate(0, SkIntToScalar(300)); |
| |
| paint.setAntiAlias(false); |
| paint.setShader(fShader1); |
| { |
| SkMatrix m; |
| m.setSkew(1, 0); |
| paint.setShader(paint.getShader()->makeWithLocalMatrix(m)); |
| } |
| { |
| SkMatrix m; |
| m.setRotate(fAngle); |
| paint.setShader(paint.getShader()->makeWithLocalMatrix(m)); |
| } |
| patch.setBounds(fSize1.fX, fSize1.fY); |
| drawpatches(canvas, paint, nu, nv, &patch); |
| } |
| |
| bool onAnimate(double nanos) override { |
| fAngle = TimeUtils::Scaled(1e-9 * nanos, 60, 360); |
| return true; |
| } |
| |
| class PtClick : public Click { |
| public: |
| int fIndex; |
| PtClick(int index) : fIndex(index) {} |
| }; |
| |
| static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) { |
| return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5); |
| } |
| |
| Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi) override { |
| x -= DX; |
| y -= DY; |
| for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) { |
| if (hittest(fPts[i], x, y)) { |
| return new PtClick((int)i); |
| } |
| } |
| return nullptr; |
| } |
| |
| bool onClick(Click* click) override { |
| fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX - DX, click->fCurr.fY - DY); |
| return true; |
| } |
| |
| private: |
| typedef Sample INHERITED; |
| }; |
| } // namespace |
| DEF_SAMPLE( return new PatchView(); ) |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| namespace { |
| static sk_sp<SkVertices> make_verts(const SkPath& path, SkScalar width) { |
| auto meas = SkContourMeasureIter(path, false).next(); |
| if (!meas) { |
| return nullptr; |
| } |
| |
| const SkPoint src[2] = { |
| { 0, -width/2 }, { 0, width/2 }, |
| }; |
| SkTDArray<SkPoint> pts; |
| |
| const SkScalar step = 2; |
| for (SkScalar distance = 0; distance < meas->length(); distance += step) { |
| SkMatrix mx; |
| if (!meas->getMatrix(distance, &mx)) { |
| continue; |
| } |
| SkPoint* dst = pts.append(2); |
| mx.mapPoints(dst, src, 2); |
| } |
| |
| int vertCount = pts.count(); |
| int indexCount = 0; // no texture |
| unsigned flags = SkVertices::kHasColors_BuilderFlag | |
| SkVertices::kIsNonVolatile_BuilderFlag; |
| SkVertices::Builder builder(SkVertices::kTriangleStrip_VertexMode, |
| vertCount, indexCount, flags); |
| memcpy(builder.positions(), pts.begin(), vertCount * sizeof(SkPoint)); |
| SkRandom rand; |
| for (int i = 0; i < vertCount; ++i) { |
| builder.colors()[i] = rand.nextU() | 0xFF000000; |
| } |
| SkDebugf("vert count = %d\n", vertCount); |
| |
| return builder.detach(); |
| } |
| |
| class PseudoInkView : public Sample { |
| enum { N = 100 }; |
| SkPath fPath; |
| sk_sp<SkVertices> fVertices[N]; |
| SkPaint fSkeletonP, fStrokeP, fVertsP; |
| bool fDirty = true; |
| |
| public: |
| PseudoInkView() { |
| fSkeletonP.setStyle(SkPaint::kStroke_Style); |
| fSkeletonP.setAntiAlias(true); |
| |
| fStrokeP.setStyle(SkPaint::kStroke_Style); |
| fStrokeP.setStrokeWidth(30); |
| fStrokeP.setColor(0x44888888); |
| } |
| |
| protected: |
| SkString name() override { return SkString("PseudoInk"); } |
| |
| bool onAnimate(double nanos) override { return true; } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| if (fDirty) { |
| for (int i = 0; i < N; ++i) { |
| fVertices[i] = make_verts(fPath, 30); |
| } |
| fDirty = false; |
| } |
| for (int i = 0; i < N; ++i) { |
| canvas->drawVertices(fVertices[i], SkBlendMode::kSrc, fVertsP); |
| canvas->translate(1, 1); |
| } |
| // canvas->drawPath(fPath, fStrokeP); |
| // canvas->drawPath(fPath, fSkeletonP); |
| } |
| |
| Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi) override { |
| Click* click = new Click(); |
| fPath.reset(); |
| fPath.moveTo(x, y); |
| return click; |
| } |
| |
| bool onClick(Click* click) override { |
| switch (click->fState) { |
| case InputState::kMove: |
| fPath.lineTo(click->fCurr); |
| fDirty = true; |
| break; |
| default: |
| break; |
| } |
| return true; |
| } |
| |
| private: |
| typedef Sample INHERITED; |
| }; |
| } // namespace |
| DEF_SAMPLE( return new PseudoInkView(); ) |
| |
| namespace { |
| // Show stroking options using patheffects (and pathops) |
| // and why strokeandfill is a hacks |
| class ManyStrokesView : public Sample { |
| SkPath fPath; |
| sk_sp<SkPathEffect> fPE[6]; |
| |
| public: |
| ManyStrokesView() { |
| fPE[0] = SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap); |
| |
| auto p0 = SkStrokePathEffect::Make(25, SkPaint::kRound_Join, SkPaint::kRound_Cap); |
| auto p1 = SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap); |
| fPE[1] = SkMergePathEffect::Make(p0, p1, SkPathOp::kDifference_SkPathOp); |
| |
| fPE[2] = SkMergePathEffect::Make(nullptr, p1, SkPathOp::kDifference_SkPathOp); |
| fPE[3] = SkMergePathEffect::Make(nullptr, p1, SkPathOp::kUnion_SkPathOp); |
| fPE[4] = SkMergePathEffect::Make(p0, nullptr, SkPathOp::kDifference_SkPathOp); |
| fPE[5] = SkMergePathEffect::Make(p0, nullptr, SkPathOp::kIntersect_SkPathOp); |
| } |
| |
| protected: |
| SkString name() override { return SkString("ManyStrokes"); } |
| |
| bool onAnimate(double nanos) override { return true; } |
| |
| void dodraw(SkCanvas* canvas, sk_sp<SkPathEffect> pe, SkScalar x, SkScalar y, |
| const SkPaint* ptr = nullptr) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setPathEffect(pe); |
| canvas->save(); |
| canvas->translate(x, y); |
| canvas->drawPath(fPath, ptr ? *ptr : paint); |
| |
| paint.setPathEffect(nullptr); |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setColor(SK_ColorGREEN); |
| canvas->drawPath(fPath, paint); |
| |
| canvas->restore(); |
| } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| SkPaint p; |
| p.setColor(0); |
| this->dodraw(canvas, nullptr, 0, 0, &p); |
| |
| this->dodraw(canvas, fPE[0], 300, 0); |
| this->dodraw(canvas, fPE[1], 0, 300); |
| this->dodraw(canvas, fPE[2], 300, 300); |
| this->dodraw(canvas, fPE[3], 600, 300); |
| this->dodraw(canvas, fPE[4], 900, 0); |
| this->dodraw(canvas, fPE[5], 900, 300); |
| |
| p.setColor(SK_ColorBLACK); |
| p.setStyle(SkPaint::kStrokeAndFill_Style); |
| p.setStrokeJoin(SkPaint::kRound_Join); |
| p.setStrokeCap(SkPaint::kRound_Cap); |
| p.setStrokeWidth(20); |
| this->dodraw(canvas, nullptr, 600, 0, &p); |
| } |
| |
| Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi) override { |
| Click* click = new Click(); |
| fPath.reset(); |
| fPath.moveTo(x, y); |
| return click; |
| } |
| |
| bool onClick(Click* click) override { |
| switch (click->fState) { |
| case InputState::kMove: |
| fPath.lineTo(click->fCurr); |
| break; |
| default: |
| break; |
| } |
| return true; |
| } |
| |
| private: |
| typedef Sample INHERITED; |
| }; |
| } // namespace |
| DEF_SAMPLE( return new ManyStrokesView(); ) |