grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SamplePatch.cpp b/samplecode/SamplePatch.cpp
new file mode 100644
index 0000000..2e55db2
--- /dev/null
+++ b/samplecode/SamplePatch.cpp
@@ -0,0 +1,418 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPath.h"
+#include "SkPorterDuff.h"
+#include "SkRandom.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkXfermode.h"
+#include "SkShaderExtras.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+
+#include "SkImageRef.h"
+#include "SkOSFile.h"
+#include "SkStream.h"
+
+#include "SkGeometry.h" // private include :(
+
+static void drawtriangle(SkCanvas* canvas, const SkPaint& paint,
+ const SkPoint pts[3]) {
+ SkPath path;
+
+ path.moveTo(pts[0]);
+ path.lineTo(pts[1]);
+ path.lineTo(pts[2]);
+
+ canvas->drawPath(path, paint);
+}
+
+static SkShader* make_shader0(SkIPoint* size) {
+ SkBitmap bm;
+
+// SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm);
+ SkImageDecoder::DecodeFile("/skimages/beach.jpg", &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() { 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(300), 0);
+ patch->draw(canvas, paint, 10, 10, true, false);
+ canvas->translate(SkIntToScalar(300), 0);
+ patch->draw(canvas, paint, 10, 10, false, true);
+ canvas->translate(SkIntToScalar(300), 0);
+ patch->draw(canvas, paint, 10, 10, true, true);
+}
+
+class PatchView : public SkView {
+ 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(90);
+ const SkScalar T = SkIntToScalar(64);
+ fPts[0].set(S*1, T);
+ fPts[1].set(S*2, T);
+ fPts[2].set(S*3, T);
+ fPts[3].set(S*4, T);
+ fPts[4].set(S*4, T*2);
+ fPts[5].set(S*4, T*3);
+ fPts[6].set(S*4, T*4);
+ fPts[7].set(S*3, T*4);
+ fPts[8].set(S*2, T*4);
+ fPts[9].set(S*1, T*4);
+ fPts[10].set(S*1, T*3);
+ fPts[11].set(S*1, T*2);
+ }
+
+ virtual ~PatchView() {
+ fShader0->safeUnref();
+ fShader1->safeUnref();
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt))
+ {
+ SkString str("Patch");
+ SampleCode::TitleR(evt, str.c_str());
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void drawBG(SkCanvas* canvas) {
+ canvas->drawColor(SK_ColorGRAY);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ this->drawBG(canvas);
+
+ SkPaint paint;
+ paint.setDither(true);
+ paint.setFilterBitmap(true);
+
+ if (false) {
+ SkPath p;
+ p.moveTo(0, 0);
+ p.lineTo(SkIntToScalar(30000), SkIntToScalar(30000));
+ paint.setStyle(SkPaint::kStroke_Style);
+ paint.setStrokeWidth(SkIntToScalar(4));
+ paint.setAntiAlias(true);
+ canvas->scale(SkIntToScalar(3), SkIntToScalar(3));
+ canvas->drawPath(p, paint);
+ return;
+ }
+
+ if (false) {
+ for (int dy = -1; dy <= 2; dy++) {
+ canvas->save();
+ if (dy == 2) {
+ canvas->translate(0, SK_Scalar1/2);
+ } else {
+ canvas->translate(0, SkIntToScalar(dy)/100);
+ }
+
+ SkBitmap bm;
+ bm.setConfig(SkBitmap::kARGB_8888_Config, 20, 20);
+ bm.allocPixels();
+ SkCanvas c(bm);
+ SkRect r = { 0, 0, 20*SK_Scalar1, SK_Scalar1 };
+ for (int y = 0; y < 20; y++) {
+ SkPaint p;
+ p.setARGB(0xFF, y*5&0xFF, y*13&0xFF, y*29&0xFF);
+ c.drawRect(r, p);
+ r.offset(0, SK_Scalar1);
+ }
+ SkIRect src;
+ SkRect dst;
+
+ static const int srcPts[] = {
+ // 2, 0, 15, 2,
+ 2, 2, 15, 16,
+ 17, 2, 2, 16,
+ 19, 2, 1, 16,
+ // 2, 18, 15, 2
+ };
+ static const double dstPts[] = {
+ // 7, 262 15, 24.5,
+ 7, 286.5, 15, 16,
+ 22, 286.5, 5, 16,
+ 27, 286.5, 1, 16,
+ // 7, 302.5, 15, 24.5
+ };
+
+ SkPaint p;
+// p.setFilterBitmap(true);
+ const int* s = srcPts;
+ const double* d = dstPts;
+ for (int i = 0; i < 3; i++) {
+ src.set(s[0], s[1], s[0]+s[2], s[1]+s[3]);
+ dst.set(SkDoubleToScalar(d[0]),
+ SkDoubleToScalar(d[1]),
+ SkDoubleToScalar(d[0]+d[2]),
+ SkDoubleToScalar(d[1]+d[3]));
+ canvas->drawBitmapRect(bm, &src, dst, &p);
+ canvas->translate(SkDoubleToScalar(1), 0);
+ s += 4;
+ d += 4;
+ }
+ canvas->restore();
+ canvas->translate(SkIntToScalar(32), 0);
+ }
+ return;
+ }
+
+ 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);
+ patch.setBounds(fSize1.fX, fSize1.fY);
+ drawpatches(canvas, paint, 10, 10, &patch);
+ }
+
+ 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) {
+ for (int i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
+ if (hittest(fPts[i], x, y)) {
+ return new PtClick(this, i);
+ }
+ }
+ return this->INHERITED::onFindClickHandler(x, y);
+ }
+
+ virtual bool onClick(Click* click) {
+ fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX, click->fCurr.fY);
+ this->inval(NULL);
+ return true;
+ }
+
+private:
+ typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new PatchView; }
+static SkViewRegister reg(MyFactory);
+