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- /*
- * 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/SkBitmap.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColorFilter.h"
- #include "include/core/SkColorPriv.h"
- #include "include/core/SkGraphics.h"
- #include "include/core/SkPath.h"
- #include "include/core/SkRegion.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkTime.h"
- #include "include/core/SkTypeface.h"
- #include "include/core/SkVertices.h"
- #include "include/effects/SkGradientShader.h"
- #include "include/utils/SkRandom.h"
- #include "samplecode/Sample.h"
- #include "src/utils/SkUTF.h"
- #include "include/core/SkStream.h"
- #include "src/core/SkOSFile.h"
- static sk_sp<SkShader> make_shader0(SkIPoint* size) {
- SkBitmap bm;
- size->set(2, 2);
- SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80);
- SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff);
- bm.allocN32Pixels(size->fX, size->fY);
- bm.eraseColor(color0);
- uint32_t* pixels = (uint32_t*) bm.getPixels();
- pixels[0] = pixels[2] = color0;
- pixels[1] = pixels[3] = color1;
- return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat);
- }
- 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 VerticesView : public Sample {
- sk_sp<SkShader> fShader0;
- sk_sp<SkShader> fShader1;
- public:
- VerticesView() {
- SkIPoint size;
- fShader0 = make_shader0(&size);
- fShader1 = make_shader1(size);
- make_strip(&fRecs[0], size.fX, size.fY);
- make_fan(&fRecs[1], size.fX, size.fY);
- make_tris(&fRecs[2]);
- fScale = SK_Scalar1;
- this->setBGColor(SK_ColorGRAY);
- }
- protected:
- SkString name() override { return SkString("Vertices"); }
- SkScalar fScale;
- void onDrawContent(SkCanvas* canvas) override {
- SkPaint paint;
- paint.setDither(true);
- paint.setFilterQuality(kLow_SkFilterQuality);
- for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
- auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount,
- fRecs[i].fVerts, fRecs[i].fTexs,
- nullptr);
- canvas->save();
- paint.setShader(nullptr);
- canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
- canvas->translate(SkIntToScalar(250), 0);
- paint.setShader(fShader0);
- canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
- canvas->translate(SkIntToScalar(250), 0);
- paint.setShader(fShader1);
- canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
- canvas->restore();
- canvas->translate(0, SkIntToScalar(250));
- }
- }
- Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
- return new Click();
- }
- bool onClick(Click* click) override {
- // fCurrX = click->fICurr.fX;
- // fCurrY = click->fICurr.fY;
- return true;
- }
- private:
- struct Rec {
- SkVertices::VertexMode fMode;
- int fCount;
- SkPoint* fVerts;
- SkPoint* fTexs;
- Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {}
- ~Rec() { delete[] fVerts; delete[] fTexs; }
- };
- void make_tris(Rec* rec) {
- int n = 10;
- SkRandom rand;
- rec->fMode = SkVertices::kTriangles_VertexMode;
- rec->fCount = n * 3;
- rec->fVerts = new SkPoint[rec->fCount];
- for (int i = 0; i < n; i++) {
- SkPoint* v = &rec->fVerts[i*3];
- for (int j = 0; j < 3; j++) {
- v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250);
- }
- }
- }
- void make_fan(Rec* rec, int texWidth, int texHeight) {
- const SkScalar tx = SkIntToScalar(texWidth);
- const SkScalar ty = SkIntToScalar(texHeight);
- const int n = 24;
- rec->fMode = SkVertices::kTriangleFan_VertexMode;
- rec->fCount = n + 2;
- rec->fVerts = new SkPoint[rec->fCount];
- rec->fTexs = new SkPoint[rec->fCount];
- SkPoint* v = rec->fVerts;
- SkPoint* t = rec->fTexs;
- v[0].set(0, 0);
- t[0].set(0, 0);
- for (int i = 0; i < n; i++) {
- SkScalar r = SK_ScalarPI * 2 * i / n,
- sin = SkScalarSin(r),
- cos = SkScalarCos(r);
- v[i+1].set(cos, sin);
- t[i+1].set(i*tx/n, ty);
- }
- v[n+1] = v[1];
- t[n+1].set(tx, ty);
- SkMatrix m;
- m.setScale(SkIntToScalar(100), SkIntToScalar(100));
- m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
- m.mapPoints(v, rec->fCount);
- }
- void make_strip(Rec* rec, int texWidth, int texHeight) {
- const SkScalar tx = SkIntToScalar(texWidth);
- const SkScalar ty = SkIntToScalar(texHeight);
- const int n = 24;
- rec->fMode = SkVertices::kTriangleStrip_VertexMode;
- rec->fCount = 2 * (n + 1);
- rec->fVerts = new SkPoint[rec->fCount];
- rec->fTexs = new SkPoint[rec->fCount];
- SkPoint* v = rec->fVerts;
- SkPoint* t = rec->fTexs;
- for (int i = 0; i < n; i++) {
- SkScalar r = SK_ScalarPI * 2 * i / n,
- sin = SkScalarSin(r),
- cos = SkScalarCos(r);
- v[i*2 + 0].set(cos/2, sin/2);
- v[i*2 + 1].set(cos, sin);
- t[i*2 + 0].set(tx * i / n, ty);
- t[i*2 + 1].set(tx * i / n, 0);
- }
- v[2*n + 0] = v[0];
- v[2*n + 1] = v[1];
- t[2*n + 0].set(tx, ty);
- t[2*n + 1].set(tx, 0);
- SkMatrix m;
- m.setScale(SkIntToScalar(100), SkIntToScalar(100));
- m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
- m.mapPoints(v, rec->fCount);
- }
- Rec fRecs[3];
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new VerticesView(); )
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