diff options
Diffstat (limited to 'chromium/third_party/skia/samplecode/SamplePatch.cpp')
| -rw-r--r-- | chromium/third_party/skia/samplecode/SamplePatch.cpp | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/chromium/third_party/skia/samplecode/SamplePatch.cpp b/chromium/third_party/skia/samplecode/SamplePatch.cpp new file mode 100644 index 00000000000..fe94bbfd528 --- /dev/null +++ b/chromium/third_party/skia/samplecode/SamplePatch.cpp @@ -0,0 +1,351 @@ + +/* + * 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); +} + +/////////////////////////////////////////////////////////////////////////////// + +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); |