b41bd15a4b
Change-Id: I64c67ddcac29b68cdd0d25e4af4153358939b0ee Reviewed-on: https://skia-review.googlesource.com/c/skia/+/343736 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com>
509 lines
15 KiB
C++
509 lines
15 KiB
C++
/*
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* Copyright 2011 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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#include "include/core/SkCanvas.h"
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#include "include/core/SkColorFilter.h"
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#include "include/core/SkColorPriv.h"
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#include "include/core/SkContourMeasure.h"
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#include "include/core/SkGraphics.h"
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#include "include/core/SkPath.h"
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#include "include/core/SkRegion.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkStream.h"
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#include "include/core/SkTime.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkVertices.h"
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#include "include/effects/SkGradientShader.h"
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#include "include/effects/SkOpPathEffect.h"
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#include "include/private/SkTDArray.h"
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#include "include/utils/SkRandom.h"
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#include "samplecode/DecodeFile.h"
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#include "samplecode/Sample.h"
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#include "src/core/SkGeometry.h"
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#include "src/core/SkOSFile.h"
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#include "src/utils/SkUTF.h"
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#include "tools/Resources.h"
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#include "tools/timer/TimeUtils.h"
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namespace {
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static sk_sp<SkShader> make_shader0(SkIPoint* size) {
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SkBitmap bm;
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decode_file(GetResourceAsData("images/dog.jpg"), &bm);
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*size = SkIPoint{bm.width(), bm.height()};
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return bm.makeShader(SkSamplingOptions(SkFilterMode::kLinear,
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SkMipmapMode::kNone));
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}
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static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
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SkPoint pts[] = { { 0, 0, },
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{ SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
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SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
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return SkGradientShader::MakeLinear(pts, colors, nullptr,
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SK_ARRAY_COUNT(colors), SkTileMode::kMirror);
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}
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class Patch {
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public:
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Patch() { sk_bzero(fPts, sizeof(fPts)); }
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~Patch() {}
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void setPatch(const SkPoint pts[12]) {
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memcpy(fPts, pts, 12 * sizeof(SkPoint));
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fPts[12] = pts[0]; // the last shall be first
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}
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void setBounds(int w, int h) { fW = w; fH = h; }
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void draw(SkCanvas*, const SkPaint&, int segsU, int segsV,
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bool doTextures, bool doColors);
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private:
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SkPoint fPts[13];
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int fW, fH;
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};
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static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) {
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SkScalar t = 0;
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SkScalar dt = SK_Scalar1 / segs;
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samples[0] = cubic[0];
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for (int i = 1; i < segs; i++) {
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t += dt;
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SkEvalCubicAt(cubic, t, &samples[i], nullptr, nullptr);
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}
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}
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static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv,
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SkPoint* pt) {
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const int TL = 0;
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const int TR = nu;
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const int BR = TR + nv;
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const int BL = BR + nu;
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SkScalar u = SkIntToScalar(iu) / nu;
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SkScalar v = SkIntToScalar(iv) / nv;
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SkScalar uv = u * v;
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SkScalar Uv = (1 - u) * v;
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SkScalar uV = u * (1 - v);
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SkScalar UV = (1 - u) * (1 - v);
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SkScalar x0 = UV * edge[TL].fX + uV * edge[TR].fX + Uv * edge[BL].fX + uv * edge[BR].fX;
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SkScalar y0 = UV * edge[TL].fY + uV * edge[TR].fY + Uv * edge[BL].fY + uv * edge[BR].fY;
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SkScalar x = (1 - v) * edge[TL+iu].fX + u * edge[TR+iv].fX +
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v * edge[BR+nu-iu].fX + (1 - u) * edge[BL+nv-iv].fX - x0;
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SkScalar y = (1 - v) * edge[TL+iu].fY + u * edge[TR+iv].fY +
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v * edge[BR+nu-iu].fY + (1 - u) * edge[BL+nv-iv].fY - y0;
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pt->set(x, y);
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}
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static SkColor make_color(SkScalar s, SkScalar t) {
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return SkColorSetARGB(0xFF, SkUnitScalarClampToByte(s), SkUnitScalarClampToByte(t), 0);
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}
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void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
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bool doTextures, bool doColors) {
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if (nu < 1 || nv < 1) {
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return;
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}
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int i, npts = (nu + nv) * 2;
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SkAutoSTMalloc<16, SkPoint> storage(npts + 1);
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SkPoint* edge0 = storage.get();
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SkPoint* edge1 = edge0 + nu;
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SkPoint* edge2 = edge1 + nv;
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SkPoint* edge3 = edge2 + nu;
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// evaluate the edge points
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eval_patch_edge(fPts + 0, edge0, nu);
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eval_patch_edge(fPts + 3, edge1, nv);
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eval_patch_edge(fPts + 6, edge2, nu);
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eval_patch_edge(fPts + 9, edge3, nv);
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edge3[nv] = edge0[0]; // the last shall be first
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for (i = 0; i < npts; i++) {
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// canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint);
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}
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int row, vertCount = (nu + 1) * (nv + 1);
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SkAutoTMalloc<SkPoint> vertStorage(vertCount);
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SkPoint* verts = vertStorage.get();
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// first row
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memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint));
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// rows
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SkPoint* r = verts;
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for (row = 1; row < nv; row++) {
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r += nu + 1;
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r[0] = edge3[nv - row];
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for (int col = 1; col < nu; col++) {
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eval_sheet(edge0, nu, nv, col, row, &r[col]);
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}
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r[nu] = edge1[row];
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}
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// last row
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SkPoint* last = verts + nv * (nu + 1);
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for (i = 0; i <= nu; i++) {
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last[i] = edge2[nu - i];
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}
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// canvas->drawPoints(verts, vertCount, paint);
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int stripCount = (nu + 1) * 2;
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SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2);
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SkAutoTMalloc<SkColor> colorStorage(stripCount);
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SkPoint* strip = stripStorage.get();
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SkPoint* tex = strip + stripCount;
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SkColor* colors = colorStorage.get();
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SkScalar t = 0;
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const SkScalar ds = SK_Scalar1 * fW / nu;
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const SkScalar dt = SK_Scalar1 * fH / nv;
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r = verts;
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for (row = 0; row < nv; row++) {
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SkPoint* upper = r;
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SkPoint* lower = r + nu + 1;
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r = lower;
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SkScalar s = 0;
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for (i = 0; i <= nu; i++) {
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strip[i*2 + 0] = *upper++;
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strip[i*2 + 1] = *lower++;
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tex[i*2 + 0].set(s, t);
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tex[i*2 + 1].set(s, t + dt);
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colors[i*2 + 0] = make_color(s/fW, t/fH);
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colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH);
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s += ds;
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}
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t += dt;
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canvas->drawVertices(SkVertices::MakeCopy(SkVertices::kTriangleStrip_VertexMode, stripCount,
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strip, doTextures ? tex : nullptr,
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doColors ? colors : nullptr),
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SkBlendMode::kModulate, paint);
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}
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}
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static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
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Patch* patch) {
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SkAutoCanvasRestore ar(canvas, true);
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patch->draw(canvas, paint, nu, nv, false, false);
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canvas->translate(SkIntToScalar(180), 0);
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patch->draw(canvas, paint, nu, nv, true, false);
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canvas->translate(SkIntToScalar(180), 0);
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patch->draw(canvas, paint, nu, nv, false, true);
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canvas->translate(SkIntToScalar(180), 0);
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patch->draw(canvas, paint, nu, nv, true, true);
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}
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static constexpr SkScalar DX = 20;
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static constexpr SkScalar DY = 0;
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static constexpr SkScalar kS = 50;
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static constexpr SkScalar kT = 40;
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struct PatchView : public Sample {
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sk_sp<SkShader> fShader0;
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sk_sp<SkShader> fShader1;
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SkScalar fAngle = 0;
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SkIPoint fSize0 = {0, 0},
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fSize1 = {0, 0};
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SkPoint fPts[12] = {
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{kS * 0, kT * 1},
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{kS * 1, kT * 1},
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{kS * 2, kT * 1},
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{kS * 3, kT * 1},
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{kS * 3, kT * 2},
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{kS * 3, kT * 3},
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{kS * 3, kT * 4},
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{kS * 2, kT * 4},
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{kS * 1, kT * 4},
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{kS * 0, kT * 4},
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{kS * 0, kT * 3},
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{kS * 0, kT * 2},
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};
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void onOnceBeforeDraw() override {
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fShader0 = make_shader0(&fSize0);
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fSize1 = fSize0;
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if (fSize0.fX == 0 || fSize0.fY == 0) {
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fSize1.set(2, 2);
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}
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fShader1 = make_shader1(fSize1);
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this->setBGColor(SK_ColorGRAY);
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}
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SkString name() override { return SkString("Patch"); }
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void onDrawContent(SkCanvas* canvas) override {
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const int nu = 10;
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const int nv = 10;
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SkPaint paint;
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paint.setDither(true);
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canvas->translate(DX, DY);
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Patch patch;
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paint.setShader(fShader0);
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if (fSize0.fX == 0) {
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fSize0.fX = 1;
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}
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if (fSize0.fY == 0) {
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fSize0.fY = 1;
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}
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patch.setBounds(fSize0.fX, fSize0.fY);
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patch.setPatch(fPts);
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drawpatches(canvas, paint, nu, nv, &patch);
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paint.setShader(nullptr);
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paint.setAntiAlias(true);
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paint.setStrokeWidth(SkIntToScalar(5));
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canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint);
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canvas->translate(0, SkIntToScalar(300));
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paint.setAntiAlias(false);
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paint.setShader(fShader1);
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{
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SkMatrix m;
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m.setSkew(1, 0);
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paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
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}
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{
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SkMatrix m;
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m.setRotate(fAngle);
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paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
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}
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patch.setBounds(fSize1.fX, fSize1.fY);
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drawpatches(canvas, paint, nu, nv, &patch);
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}
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bool onAnimate(double nanos) override {
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fAngle = TimeUtils::Scaled(1e-9 * nanos, 60, 360);
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return true;
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}
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class PtClick : public Click {
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public:
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int fIndex;
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PtClick(int index) : fIndex(index) {}
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};
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static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) {
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return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5);
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}
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Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override {
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x -= DX;
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y -= DY;
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for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
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if (hittest(fPts[i], x, y)) {
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return new PtClick((int)i);
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}
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}
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return nullptr;
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}
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bool onClick(Click* click) override {
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fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX - DX, click->fCurr.fY - DY);
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return true;
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}
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private:
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using INHERITED = Sample;
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};
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} // namespace
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DEF_SAMPLE( return new PatchView(); )
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//////////////////////////////////////////////////////////////////////////////
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namespace {
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static sk_sp<SkVertices> make_verts(const SkPath& path, SkScalar width) {
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auto meas = SkContourMeasureIter(path, false).next();
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if (!meas) {
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return nullptr;
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}
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const SkPoint src[2] = {
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{ 0, -width/2 }, { 0, width/2 },
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};
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SkTDArray<SkPoint> pts;
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const SkScalar step = 2;
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for (SkScalar distance = 0; distance < meas->length(); distance += step) {
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SkMatrix mx;
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if (!meas->getMatrix(distance, &mx)) {
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continue;
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}
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SkPoint* dst = pts.append(2);
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mx.mapPoints(dst, src, 2);
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}
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int vertCount = pts.count();
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int indexCount = 0; // no texture
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unsigned flags = SkVertices::kHasColors_BuilderFlag;
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SkVertices::Builder builder(SkVertices::kTriangleStrip_VertexMode,
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vertCount, indexCount, flags);
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memcpy(builder.positions(), pts.begin(), vertCount * sizeof(SkPoint));
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SkRandom rand;
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for (int i = 0; i < vertCount; ++i) {
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builder.colors()[i] = rand.nextU() | 0xFF000000;
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}
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SkDebugf("vert count = %d\n", vertCount);
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return builder.detach();
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}
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class PseudoInkView : public Sample {
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enum { N = 100 };
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SkPath fPath;
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sk_sp<SkVertices> fVertices[N];
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SkPaint fSkeletonP, fStrokeP, fVertsP;
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bool fDirty = true;
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public:
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PseudoInkView() {
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fSkeletonP.setStyle(SkPaint::kStroke_Style);
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fSkeletonP.setAntiAlias(true);
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fStrokeP.setStyle(SkPaint::kStroke_Style);
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fStrokeP.setStrokeWidth(30);
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fStrokeP.setColor(0x44888888);
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}
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protected:
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SkString name() override { return SkString("PseudoInk"); }
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bool onAnimate(double nanos) override { return true; }
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void onDrawContent(SkCanvas* canvas) override {
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if (fDirty) {
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for (int i = 0; i < N; ++i) {
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fVertices[i] = make_verts(fPath, 30);
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}
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fDirty = false;
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}
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for (int i = 0; i < N; ++i) {
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canvas->drawVertices(fVertices[i], SkBlendMode::kSrc, fVertsP);
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canvas->translate(1, 1);
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}
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// canvas->drawPath(fPath, fStrokeP);
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// canvas->drawPath(fPath, fSkeletonP);
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}
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Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override {
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Click* click = new Click();
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fPath.reset();
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fPath.moveTo(x, y);
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return click;
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}
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bool onClick(Click* click) override {
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switch (click->fState) {
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case skui::InputState::kMove:
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fPath.lineTo(click->fCurr);
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fDirty = true;
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break;
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default:
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break;
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}
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return true;
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}
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private:
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using INHERITED = Sample;
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};
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} // namespace
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DEF_SAMPLE( return new PseudoInkView(); )
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namespace {
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// Show stroking options using patheffects (and pathops)
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// and why strokeandfill is a hacks
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class ManyStrokesView : public Sample {
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SkPath fPath;
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sk_sp<SkPathEffect> fPE[6];
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public:
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ManyStrokesView() {
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fPE[0] = SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap);
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auto p0 = SkStrokePathEffect::Make(25, SkPaint::kRound_Join, SkPaint::kRound_Cap);
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auto p1 = SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap);
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fPE[1] = SkMergePathEffect::Make(p0, p1, SkPathOp::kDifference_SkPathOp);
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fPE[2] = SkMergePathEffect::Make(nullptr, p1, SkPathOp::kDifference_SkPathOp);
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fPE[3] = SkMergePathEffect::Make(nullptr, p1, SkPathOp::kUnion_SkPathOp);
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fPE[4] = SkMergePathEffect::Make(p0, nullptr, SkPathOp::kDifference_SkPathOp);
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fPE[5] = SkMergePathEffect::Make(p0, nullptr, SkPathOp::kIntersect_SkPathOp);
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}
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protected:
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SkString name() override { return SkString("ManyStrokes"); }
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bool onAnimate(double nanos) override { return true; }
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void dodraw(SkCanvas* canvas, sk_sp<SkPathEffect> pe, SkScalar x, SkScalar y,
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const SkPaint* ptr = nullptr) {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setPathEffect(pe);
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canvas->save();
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canvas->translate(x, y);
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canvas->drawPath(fPath, ptr ? *ptr : paint);
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paint.setPathEffect(nullptr);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setColor(SK_ColorGREEN);
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canvas->drawPath(fPath, paint);
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canvas->restore();
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}
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void onDrawContent(SkCanvas* canvas) override {
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SkPaint p;
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p.setColor(0);
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this->dodraw(canvas, nullptr, 0, 0, &p);
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this->dodraw(canvas, fPE[0], 300, 0);
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this->dodraw(canvas, fPE[1], 0, 300);
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this->dodraw(canvas, fPE[2], 300, 300);
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this->dodraw(canvas, fPE[3], 600, 300);
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|
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, skui::ModifierKey modi) override {
|
|
Click* click = new Click();
|
|
fPath.reset();
|
|
fPath.moveTo(x, y);
|
|
return click;
|
|
}
|
|
|
|
bool onClick(Click* click) override {
|
|
switch (click->fState) {
|
|
case skui::InputState::kMove:
|
|
fPath.lineTo(click->fCurr);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
using INHERITED = Sample;
|
|
};
|
|
} // namespace
|
|
DEF_SAMPLE( return new ManyStrokesView(); )
|