experiment
git-svn-id: http://skia.googlecode.com/svn/trunk@396 2bbb7eff-a529-9590-31e7-b0007b416f81
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reed@android.com
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samplecode/ClockFaceView.cpp
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255
samplecode/ClockFaceView.cpp
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#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkPath.h"
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#include "SkRegion.h"
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#include "SkShader.h"
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#include "SkUtils.h"
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#include "SkColorPriv.h"
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#include "SkColorFilter.h"
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#include "SkTypeface.h"
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#include "SkAvoidXfermode.h"
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static inline SkPMColor rgb2gray(SkPMColor c)
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{
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unsigned r = SkGetPackedR32(c);
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unsigned g = SkGetPackedG32(c);
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unsigned b = SkGetPackedB32(c);
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unsigned x = r * 5 + g * 7 + b * 4 >> 4;
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return SkPackARGB32(0, x, x, x) | (c & (SK_A32_MASK << SK_A32_SHIFT));
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}
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class SkGrayScaleColorFilter : public SkColorFilter {
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public:
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virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[])
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{
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for (int i = 0; i < count; i++)
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result[i] = rgb2gray(src[i]);
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}
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};
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class SkChannelMaskColorFilter : public SkColorFilter {
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public:
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SkChannelMaskColorFilter(U8CPU redMask, U8CPU greenMask, U8CPU blueMask)
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{
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fMask = SkPackARGB32(0xFF, redMask, greenMask, blueMask);
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}
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virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[])
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{
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SkPMColor mask = fMask;
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for (int i = 0; i < count; i++)
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result[i] = src[i] & mask;
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}
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private:
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SkPMColor fMask;
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};
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///////////////////////////////////////////////////////////
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#include "SkGradientShader.h"
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#include "SkLayerRasterizer.h"
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#include "SkBlurMaskFilter.h"
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#include "Sk2DPathEffect.h"
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class Dot2DPathEffect : public Sk2DPathEffect {
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public:
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Dot2DPathEffect(SkScalar radius, const SkMatrix& matrix,
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SkTDArray<SkPoint>* pts)
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: Sk2DPathEffect(matrix), fRadius(radius), fPts(pts) {}
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virtual void flatten(SkFlattenableWriteBuffer& buffer)
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{
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this->INHERITED::flatten(buffer);
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buffer.writeScalar(fRadius);
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}
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virtual Factory getFactory() { return CreateProc; }
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protected:
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virtual void begin(const SkIRect& uvBounds, SkPath* dst) {
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if (fPts) {
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fPts->reset();
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}
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this->INHERITED::begin(uvBounds, dst);
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}
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// virtual void end(SkPath* dst) {}
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virtual void next(const SkPoint& loc, int u, int v, SkPath* dst)
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{
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if (fPts) {
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*fPts->append() = loc;
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}
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dst->addCircle(loc.fX, loc.fY, fRadius);
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}
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Dot2DPathEffect(SkFlattenableReadBuffer& buffer) : Sk2DPathEffect(buffer)
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{
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fRadius = buffer.readScalar();
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fPts = NULL;
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}
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private:
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SkScalar fRadius;
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SkTDArray<SkPoint>* fPts;
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static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer)
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{
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return new Dot2DPathEffect(buffer);
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}
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typedef Sk2DPathEffect INHERITED;
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};
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class InverseFillPE : public SkPathEffect {
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public:
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InverseFillPE() {}
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virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width) {
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*dst = src;
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dst->setFillType(SkPath::kInverseWinding_FillType);
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return true;
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}
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virtual Factory getFactory() { return Factory; }
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protected:
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// InverseFillPE(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
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private:
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static SkFlattenable* Factory(SkFlattenableReadBuffer& buffer) {
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return new InverseFillPE;
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}
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typedef SkPathEffect INHERITED;
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};
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static SkPathEffect* makepe(float interp, SkTDArray<SkPoint>* pts) {
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SkMatrix lattice;
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SkScalar rad = 3 + SkIntToScalar(4) * (1 - interp);
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lattice.setScale(rad*2, rad*2, 0, 0);
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lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
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return new Dot2DPathEffect(rad, lattice, pts);
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}
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static void r7(SkLayerRasterizer* rast, SkPaint& p, SkScalar interp) {
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p.setPathEffect(makepe(interp, NULL))->unref();
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rast->addLayer(p);
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#if 0
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p.setPathEffect(new InverseFillPE())->unref();
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p.setXfermodeMode(SkXfermode::kSrcIn_Mode);
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p.setXfermodeMode(SkXfermode::kClear_Mode);
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p.setAlpha((1 - interp) * 255);
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rast->addLayer(p);
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#endif
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}
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typedef void (*raster_proc)(SkLayerRasterizer*, SkPaint&);
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#include "SkXfermode.h"
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static void apply_shader(SkPaint* paint, float scale)
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{
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SkPaint p;
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SkLayerRasterizer* rast = new SkLayerRasterizer;
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p.setAntiAlias(true);
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r7(rast, p, scale);
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paint->setRasterizer(rast)->unref();
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paint->setColor(SK_ColorBLUE);
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}
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class ClockFaceView : public SkView {
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SkTypeface* fFace;
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SkScalar fInterp;
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SkScalar fDx;
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public:
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ClockFaceView()
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{
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fFace = SkTypeface::CreateFromFile("/Users/reed/Downloads/p052024l.pfb");
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fInterp = 0;
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fDx = SK_Scalar1/64;
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}
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virtual ~ClockFaceView()
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{
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fFace->safeUnref();
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt)
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{
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if (SampleCode::TitleQ(*evt))
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{
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SampleCode::TitleR(evt, "Text Effects");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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void drawBG(SkCanvas* canvas)
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{
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// canvas->drawColor(0xFFDDDDDD);
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canvas->drawColor(SK_ColorWHITE);
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}
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static void drawdots(SkCanvas* canvas, const SkPaint& orig) {
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SkTDArray<SkPoint> pts;
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SkPathEffect* pe = makepe(0, &pts);
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SkScalar width = -1;
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SkPath path, dstPath;
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orig.getTextPath("9", 1, 0, 0, &path);
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pe->filterPath(&dstPath, path, &width);
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SkPaint p;
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p.setAntiAlias(true);
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p.setStrokeWidth(10);
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p.setColor(SK_ColorRED);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, pts.count(), pts.begin(),
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p);
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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SkScalar x = SkIntToScalar(20);
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SkScalar y = SkIntToScalar(300);
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setTextSize(SkIntToScalar(240));
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paint.setTypeface(SkTypeface::CreateFromName("sans-serif",
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SkTypeface::kBold));
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SkString str("9");
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paint.setTypeface(fFace);
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apply_shader(&paint, fInterp);
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canvas->drawText(str.c_str(), str.size(), x, y, paint);
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// drawdots(canvas, paint);
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if (false) {
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fInterp += fDx;
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if (fInterp > 1) {
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fInterp = 1;
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fDx = -fDx;
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} else if (fInterp < 0) {
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fInterp = 0;
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fDx = -fDx;
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}
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this->inval(NULL);
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}
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}
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private:
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typedef SkView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new ClockFaceView; }
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static SkViewRegister reg(MyFactory);
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