| |
| /* |
| * 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 "SampleCode.h" |
| #include "SkView.h" |
| #include "SkCanvas.h" |
| #include "SkGradientShader.h" |
| #include "SkGraphics.h" |
| #include "SkImageDecoder.h" |
| #include "SkPath.h" |
| #include "SkRandom.h" |
| #include "SkRegion.h" |
| #include "SkShader.h" |
| #include "SkUtils.h" |
| #include "SkXfermode.h" |
| #include "SkColorPriv.h" |
| #include "SkColorFilter.h" |
| #include "SkTime.h" |
| #include "SkTypeface.h" |
| |
| #include "SkOSFile.h" |
| #include "SkStream.h" |
| |
| #include "SkGeometry.h" // private include :( |
| |
| static SkShader* make_shader0(SkIPoint* size) { |
| SkBitmap bm; |
| |
| // SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm); |
| SkImageDecoder::DecodeFile("/skimages/logo.png", &bm); |
| size->set(bm.width(), bm.height()); |
| return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode, |
| SkShader::kClamp_TileMode); |
| } |
| |
| static 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::CreateLinear(pts, colors, NULL, |
| SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode, NULL); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| 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], NULL, NULL); |
| } |
| } |
| |
| 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 = SkScalarMul(u, v); |
| SkScalar Uv = SkScalarMul(SK_Scalar1 - u, v); |
| SkScalar uV = SkScalarMul(u, SK_Scalar1 - v); |
| SkScalar UV = SkScalarMul(SK_Scalar1 - u, SK_Scalar1 - v); |
| |
| SkScalar x0 = SkScalarMul(UV, edge[TL].fX) + SkScalarMul(uV, edge[TR].fX) + |
| SkScalarMul(Uv, edge[BL].fX) + SkScalarMul(uv, edge[BR].fX); |
| SkScalar y0 = SkScalarMul(UV, edge[TL].fY) + SkScalarMul(uV, edge[TR].fY) + |
| SkScalarMul(Uv, edge[BL].fY) + SkScalarMul(uv, edge[BR].fY); |
| |
| SkScalar x = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fX) + |
| SkScalarMul(u, edge[TR+iv].fX) + |
| SkScalarMul(v, edge[BR+nu-iu].fX) + |
| SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fX) - x0; |
| SkScalar y = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fY) + |
| SkScalarMul(u, edge[TR+iv].fY) + |
| SkScalarMul(v, edge[BR+nu-iu].fY) + |
| SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fY) - y0; |
| pt->set(x, y); |
| } |
| |
| static int ScalarTo255(SkScalar v) { |
| int scale = SkScalarToFixed(v) >> 8; |
| if (scale < 0) { |
| scale = 0; |
| } else if (scale > 255) { |
| scale = 255; |
| } |
| return scale; |
| } |
| |
| static SkColor make_color(SkScalar s, SkScalar t) { |
| int cs = ScalarTo255(s); |
| int ct = ScalarTo255(t); |
| return SkColorSetARGB(0xFF, cs, 0, 0) + SkColorSetARGB(0, 0, ct, 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(SkCanvas::kTriangleStrip_VertexMode, stripCount, |
| strip, doTextures ? tex : NULL, |
| doColors ? colors : NULL, NULL, |
| NULL, 0, paint); |
| } |
| } |
| |
| static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, |
| Patch* patch) { |
| |
| SkAutoCanvasRestore ar(canvas, true); |
| |
| patch->draw(canvas, paint, 10, 10, false, false); |
| canvas->translate(SkIntToScalar(180), 0); |
| patch->draw(canvas, paint, 10, 10, true, false); |
| canvas->translate(SkIntToScalar(180), 0); |
| patch->draw(canvas, paint, 10, 10, false, true); |
| canvas->translate(SkIntToScalar(180), 0); |
| patch->draw(canvas, paint, 10, 10, true, true); |
| } |
| |
| class PatchView : public SampleView { |
| SkShader* fShader0; |
| SkShader* fShader1; |
| SkIPoint fSize0, fSize1; |
| SkPoint fPts[12]; |
| |
| public: |
| PatchView() { |
| fShader0 = make_shader0(&fSize0); |
| fSize1 = fSize0; |
| if (fSize0.fX == 0 || fSize0.fY == 0) { |
| fSize1.set(2, 2); |
| } |
| fShader1 = make_shader1(fSize1); |
| |
| const SkScalar S = SkIntToScalar(50); |
| const SkScalar T = SkIntToScalar(40); |
| fPts[0].set(S*0, T); |
| fPts[1].set(S*1, T); |
| fPts[2].set(S*2, T); |
| fPts[3].set(S*3, T); |
| fPts[4].set(S*3, T*2); |
| fPts[5].set(S*3, T*3); |
| fPts[6].set(S*3, T*4); |
| fPts[7].set(S*2, T*4); |
| fPts[8].set(S*1, T*4); |
| fPts[9].set(S*0, T*4); |
| fPts[10].set(S*0, T*3); |
| fPts[11].set(S*0, T*2); |
| |
| this->setBGColor(SK_ColorGRAY); |
| } |
| |
| virtual ~PatchView() { |
| SkSafeUnref(fShader0); |
| SkSafeUnref(fShader1); |
| } |
| |
| protected: |
| // overrides from SkEventSink |
| virtual bool onQuery(SkEvent* evt) { |
| if (SampleCode::TitleQ(*evt)) { |
| SampleCode::TitleR(evt, "Patch"); |
| return true; |
| } |
| return this->INHERITED::onQuery(evt); |
| } |
| |
| virtual void onDrawContent(SkCanvas* canvas) { |
| SkPaint paint; |
| paint.setDither(true); |
| paint.setFilterLevel(SkPaint::kLow_FilterLevel); |
| |
| canvas->translate(SkIntToScalar(20), 0); |
| |
| 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, 10, 10, &patch); |
| |
| paint.setShader(NULL); |
| 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); |
| SkShader* s = SkShader::CreateLocalMatrixShader(paint.getShader(), m); |
| paint.setShader(s)->unref(); |
| } |
| { |
| static int gAngle; |
| SkMatrix m; |
| m.setRotate(SkIntToScalar(gAngle++)); |
| SkShader* s = SkShader::CreateLocalMatrixShader(paint.getShader(), m); |
| paint.setShader(s)->unref(); |
| } |
| patch.setBounds(fSize1.fX, fSize1.fY); |
| drawpatches(canvas, paint, 10, 10, &patch); |
| |
| this->inval(NULL); |
| } |
| |
| class PtClick : public Click { |
| public: |
| int fIndex; |
| PtClick(SkView* view, int index) : Click(view), fIndex(index) {} |
| }; |
| |
| static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) { |
| return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5); |
| } |
| |
| virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, |
| unsigned modi) SK_OVERRIDE { |
| for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) { |
| if (hittest(fPts[i], x, y)) { |
| return new PtClick(this, (int)i); |
| } |
| } |
| return this->INHERITED::onFindClickHandler(x, y, modi); |
| } |
| |
| virtual bool onClick(Click* click) { |
| fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX, click->fCurr.fY); |
| this->inval(NULL); |
| return true; |
| } |
| |
| private: |
| typedef SampleView INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| static SkView* MyFactory() { return new PatchView; } |
| static SkViewRegister reg(MyFactory); |