capture drawings to png
git-svn-id: http://skia.googlecode.com/svn/trunk@377 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleSlides.cpp b/samplecode/SampleSlides.cpp
new file mode 100644
index 0000000..25e0a69
--- /dev/null
+++ b/samplecode/SampleSlides.cpp
@@ -0,0 +1,534 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkPaint.h"
+
+typedef void (*SlideProc)(SkCanvas*);
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "Sk1DPathEffect.h"
+#include "Sk2DPathEffect.h"
+#include "SkCornerPathEffect.h"
+#include "SkDashPathEffect.h"
+#include "SkDiscretePathEffect.h"
+
+static void compose_pe(SkPaint* paint) {
+ SkPathEffect* pe = paint->getPathEffect();
+ SkPathEffect* corner = new SkCornerPathEffect(25);
+ SkPathEffect* compose;
+ if (pe) {
+ compose = new SkComposePathEffect(pe, corner);
+ corner->unref();
+ } else {
+ compose = corner;
+ }
+ paint->setPathEffect(compose)->unref();
+}
+
+static void hair_pe(SkPaint* paint) {
+ paint->setStrokeWidth(0);
+}
+
+static void hair2_pe(SkPaint* paint) {
+ paint->setStrokeWidth(0);
+ compose_pe(paint);
+}
+
+static void stroke_pe(SkPaint* paint) {
+ paint->setStrokeWidth(12);
+ compose_pe(paint);
+}
+
+static void dash_pe(SkPaint* paint) {
+ SkScalar inter[] = { 20, 10, 10, 10 };
+ paint->setStrokeWidth(12);
+ paint->setPathEffect(new SkDashPathEffect(inter, SK_ARRAY_COUNT(inter),
+ 0))->unref();
+ compose_pe(paint);
+}
+
+static const int gXY[] = {
+4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
+};
+
+static void scale(SkPath* path, SkScalar scale) {
+ SkMatrix m;
+ m.setScale(scale, scale);
+ path->transform(m);
+}
+
+static void one_d_pe(SkPaint* paint) {
+ SkPath path;
+ path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
+ for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
+ path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
+ path.close();
+ path.offset(SkIntToScalar(-6), 0);
+ scale(&path, 1.5);
+
+ paint->setPathEffect(new SkPath1DPathEffect(path, SkIntToScalar(21), 0,
+ SkPath1DPathEffect::kRotate_Style))->unref();
+ compose_pe(paint);
+}
+
+typedef void (*PE_Proc)(SkPaint*);
+static const PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
+
+static void fill_pe(SkPaint* paint) {
+ paint->setStyle(SkPaint::kFill_Style);
+ paint->setPathEffect(NULL);
+}
+
+static void discrete_pe(SkPaint* paint) {
+ paint->setPathEffect(new SkDiscretePathEffect(10, 4))->unref();
+}
+
+class TilePathEffect : public Sk2DPathEffect {
+ static SkMatrix make_mat() {
+ SkMatrix m;
+ m.setScale(12, 12);
+ return m;
+ }
+public:
+ TilePathEffect() : Sk2DPathEffect(make_mat()) {}
+
+protected:
+ virtual void next(const SkPoint& loc, int u, int v, SkPath* dst) {
+ dst->addCircle(loc.fX, loc.fY, 5);
+ }
+};
+
+static void tile_pe(SkPaint* paint) {
+ paint->setPathEffect(new TilePathEffect)->unref();
+}
+
+static const PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
+
+static void patheffect_slide(SkCanvas* canvas) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setStyle(SkPaint::kStroke_Style);
+
+ SkPath path;
+ path.moveTo(20, 20);
+ path.lineTo(70, 120);
+ path.lineTo(120, 30);
+ path.lineTo(170, 80);
+ path.lineTo(240, 50);
+
+ size_t i;
+ canvas->save();
+ for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
+ gPE[i](&paint);
+ canvas->drawPath(path, paint);
+ canvas->translate(0, 75);
+ }
+ canvas->restore();
+
+ path.reset();
+ SkRect r = { 0, 0, 250, 120 };
+ path.addOval(r, SkPath::kCW_Direction);
+ r.inset(50, 50);
+ path.addRect(r, SkPath::kCCW_Direction);
+
+ canvas->translate(320, 20);
+ for (i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
+ gPE2[i](&paint);
+ canvas->drawPath(path, paint);
+ canvas->translate(0, 160);
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkGradientShader.h"
+
+struct GradData {
+ int fCount;
+ const SkColor* fColors;
+ const SkScalar* fPos;
+};
+
+static const SkColor gColors[] = {
+SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
+};
+static const SkScalar gPos0[] = { 0, SK_Scalar1 };
+static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
+static const SkScalar gPos2[] = {
+0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
+};
+
+static const GradData gGradData[] = {
+{ 2, gColors, NULL },
+{ 2, gColors, gPos0 },
+{ 2, gColors, gPos1 },
+{ 5, gColors, NULL },
+{ 5, gColors, gPos2 }
+};
+
+static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
+ SkShader::TileMode tm, SkUnitMapper* mapper) {
+ return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
+ data.fCount, tm, mapper);
+}
+
+static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
+ SkShader::TileMode tm, SkUnitMapper* mapper) {
+ SkPoint center;
+ center.set(SkScalarAve(pts[0].fX, pts[1].fX),
+ SkScalarAve(pts[0].fY, pts[1].fY));
+ return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
+ data.fPos, data.fCount, tm, mapper);
+}
+
+static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
+ SkShader::TileMode tm, SkUnitMapper* mapper) {
+ SkPoint center;
+ center.set(SkScalarAve(pts[0].fX, pts[1].fX),
+ SkScalarAve(pts[0].fY, pts[1].fY));
+ return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
+ data.fPos, data.fCount, mapper);
+}
+
+static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
+ SkShader::TileMode tm, SkUnitMapper* mapper) {
+ SkPoint center0, center1;
+ center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
+ SkScalarAve(pts[0].fY, pts[1].fY));
+ center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
+ SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
+ return SkGradientShader::CreateTwoPointRadial(
+ center1, (pts[1].fX - pts[0].fX) / 7,
+ center0, (pts[1].fX - pts[0].fX) / 2,
+ data.fColors, data.fPos, data.fCount, tm, mapper);
+}
+
+typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
+ SkShader::TileMode tm, SkUnitMapper* mapper);
+static const GradMaker gGradMakers[] = {
+ MakeLinear, MakeRadial, MakeSweep, Make2Radial
+};
+
+static void gradient_slide(SkCanvas* canvas) {
+ SkPoint pts[2] = {
+ { 0, 0 },
+ { SkIntToScalar(100), SkIntToScalar(100) }
+ };
+ SkShader::TileMode tm = SkShader::kClamp_TileMode;
+ SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setDither(true);
+
+ canvas->translate(SkIntToScalar(20), SkIntToScalar(10));
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
+ canvas->save();
+ for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
+ SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL);
+ paint.setShader(shader);
+ canvas->drawRect(r, paint);
+ shader->unref();
+ canvas->translate(0, SkIntToScalar(120));
+ }
+ canvas->restore();
+ canvas->translate(SkIntToScalar(120), 0);
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkPathMeasure.h"
+
+static SkScalar getpathlen(const SkPath& path) {
+ SkPathMeasure meas(path, false);
+ return meas.getLength();
+}
+
+static void textonpath_slide(SkCanvas* canvas) {
+ const char* text = "Displacement";
+ size_t len =strlen(text);
+ SkPath path;
+ path.moveTo(100, 300);
+ path.quadTo(300, 100, 500, 300);
+ path.offset(0, -100);
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setTextSize(40);
+
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawPath(path, paint);
+ paint.setStyle(SkPaint::kFill_Style);
+
+ SkScalar x = 50;
+ paint.setColor(0xFF008800);
+ canvas->drawTextOnPathHV(text, len, path,
+ x, paint.getTextSize()*2/3, paint);
+ paint.setColor(SK_ColorRED);
+ canvas->drawTextOnPathHV(text, len, path,
+ x + 60, 0, paint);
+ paint.setColor(SK_ColorBLUE);
+ canvas->drawTextOnPathHV(text, len, path,
+ x + 120, -paint.getTextSize()*2/3, paint);
+
+ path.offset(0, 200);
+ paint.setTextAlign(SkPaint::kRight_Align);
+
+ text = "Matrices";
+ len = strlen(text);
+ SkScalar pathLen = getpathlen(path);
+ SkMatrix matrix;
+
+ paint.setColor(SK_ColorBLACK);
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawPath(path, paint);
+ paint.setStyle(SkPaint::kFill_Style);
+
+ paint.setTextSize(50);
+ canvas->drawTextOnPath(text, len, path, NULL, paint);
+
+ paint.setColor(SK_ColorRED);
+ matrix.setScale(-SK_Scalar1, SK_Scalar1);
+ matrix.postTranslate(pathLen, 0);
+ canvas->drawTextOnPath(text, len, path, &matrix, paint);
+
+ paint.setColor(SK_ColorBLUE);
+ matrix.setScale(SK_Scalar1, -SK_Scalar1);
+ canvas->drawTextOnPath(text, len, path, &matrix, paint);
+
+ paint.setColor(0xFF008800);
+ matrix.setScale(-SK_Scalar1, -SK_Scalar1);
+ matrix.postTranslate(pathLen, 0);
+ canvas->drawTextOnPath(text, len, path, &matrix, paint);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkImageDecoder.h"
+#include "SkOSFile.h"
+#include "SkRandom.h"
+#include "SkStream.h"
+#include "SkNinePatch.h"
+
+static SkShader* make_shader0(SkIPoint* size) {
+ SkBitmap bm;
+
+ SkImageDecoder::DecodeFile("/skimages/logo.gif", &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);
+}
+
+struct Rec {
+ SkCanvas::VertexMode fMode;
+ int fCount;
+ SkPoint* fVerts;
+ SkPoint* fTexs;
+
+ Rec() : fCount(0), fVerts(NULL), fTexs(NULL) {}
+ ~Rec() { delete[] fVerts; delete[] fTexs; }
+};
+
+void make_tris(Rec* rec) {
+ int n = 10;
+ SkRandom rand;
+
+ rec->fMode = SkCanvas::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 = SkCanvas::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 cos;
+ SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
+ 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 = SkCanvas::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 cos;
+ SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
+ 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);
+}
+
+static void mesh_slide(SkCanvas* canvas) {
+ Rec fRecs[3];
+ SkIPoint size;
+
+ SkShader* fShader0 = make_shader0(&size);
+ SkShader* fShader1 = make_shader1(size);
+
+ make_strip(&fRecs[0], size.fX, size.fY);
+ make_fan(&fRecs[1], size.fX, size.fY);
+ make_tris(&fRecs[2]);
+
+
+
+ SkPaint paint;
+ paint.setDither(true);
+ paint.setFilterBitmap(true);
+
+ canvas->drawColor(SK_ColorLTGRAY);
+ for (int i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
+ canvas->save();
+
+ paint.setShader(NULL);
+ canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
+ fRecs[i].fVerts, fRecs[i].fTexs,
+ NULL, NULL, NULL, 0, paint);
+
+ canvas->translate(SkIntToScalar(210), 0);
+
+ paint.setShader(fShader0);
+ canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
+ fRecs[i].fVerts, fRecs[i].fTexs,
+ NULL, NULL, NULL, 0, paint);
+
+ canvas->translate(SkIntToScalar(210), 0);
+
+ paint.setShader(fShader1);
+ canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
+ fRecs[i].fVerts, fRecs[i].fTexs,
+ NULL, NULL, NULL, 0, paint);
+ canvas->restore();
+
+ canvas->translate(0, SkIntToScalar(250));
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkImageEncoder.h"
+
+static const SlideProc gProc[] = {
+ patheffect_slide,
+ gradient_slide,
+ textonpath_slide,
+ mesh_slide
+};
+
+class SlideView : public SkView {
+ int fIndex;
+public:
+ SlideView() {
+ fIndex = 0;
+
+ SkBitmap bm;
+ bm.setConfig(SkBitmap::kARGB_8888_Config, 1024, 768);
+ bm.allocPixels();
+ SkCanvas canvas(bm);
+ SkScalar s = SkIntToScalar(1024) / 640;
+ canvas.scale(s, s);
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); i++) {
+ canvas.save();
+ canvas.drawColor(SK_ColorWHITE);
+ gProc[i](&canvas);
+ canvas.restore();
+ SkString str;
+ str.printf("/skimages/slide_%d.png", i);
+ SkImageEncoder::EncodeFile(str.c_str(), bm, SkImageEncoder::kPNG_Type, 100);
+ }
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "Slides");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void drawBG(SkCanvas* canvas) {
+ canvas->drawColor(SK_ColorWHITE);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ this->drawBG(canvas);
+
+ gProc[fIndex](canvas);
+ }
+
+ virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+ fIndex = (fIndex + 1) % SK_ARRAY_COUNT(gProc);
+ this->inval(NULL);
+ return NULL;
+ }
+
+private:
+ typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new SlideView; }
+static SkViewRegister reg(MyFactory);
+