2008-12-17 18:59:43 +03:00
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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 "SkBlurMaskFilter.h"
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#include "SkCamera.h"
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#include "SkColorFilter.h"
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#include "SkColorPriv.h"
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#include "SkDevice.h"
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#include "SkGradientShader.h"
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#include "SkImageDecoder.h"
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#include "SkInterpolator.h"
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#include "SkMaskFilter.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 "SkTime.h"
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#include "SkTypeface.h"
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#include "SkUtils.h"
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#include "SkKey.h"
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#include "SkXfermode.h"
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#include "SkDrawFilter.h"
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static void make_paint(SkPaint* paint) {
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SkColor colors[] = { 0, SK_ColorWHITE };
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SkPoint pts[] = { 0, 0, 0, SK_Scalar1*20 };
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SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
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paint->setShader(s)->unref();
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2009-06-24 16:41:42 +04:00
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paint->setXfermodeMode(SkXfermode::kDstIn_Mode);
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2008-12-17 18:59:43 +03:00
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}
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static void dump_layers(const char label[], SkCanvas* canvas) {
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SkDebugf("Dump Layers(%s)\n", label);
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SkCanvas::LayerIter iter(canvas, true);
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int index = 0;
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while (!iter.done()) {
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const SkBitmap& bm = iter.device()->accessBitmap(false);
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const SkIRect& clip = iter.clip().getBounds();
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SkDebugf("Layer[%d] bitmap [%d %d] X=%d Y=%d clip=[%d %d %d %d] alpha=%d\n", index++,
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bm.width(), bm.height(), iter.x(), iter.y(),
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clip.fLeft, clip.fTop, clip.fRight, clip.fBottom,
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iter.paint().getAlpha());
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iter.next();
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}
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}
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// test drawing with strips of fading gradient above and below
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static void test_fade(SkCanvas* canvas) {
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SkAutoCanvasRestore ar(canvas, true);
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SkRect r;
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SkPaint p;
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p.setAlpha(0x88);
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SkAutoCanvasRestore(canvas, false);
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// create the layers
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r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100));
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canvas->clipRect(r);
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r.fBottom = SkIntToScalar(20);
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canvas->saveLayer(&r, NULL, (SkCanvas::SaveFlags)(SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kFullColorLayer_SaveFlag));
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r.fTop = SkIntToScalar(80);
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r.fBottom = SkIntToScalar(100);
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canvas->saveLayer(&r, NULL, (SkCanvas::SaveFlags)(SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kFullColorLayer_SaveFlag));
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// now draw the "content"
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if (true) {
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r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100));
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canvas->saveLayerAlpha(&r, 0x80);
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setAntiAlias(true);
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canvas->drawOval(r, p);
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dump_layers("inside layer alpha", canvas);
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canvas->restore();
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} else {
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r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100));
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setAntiAlias(true);
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canvas->drawOval(r, p);
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}
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// return;
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dump_layers("outside layer alpha", canvas);
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// now apply an effect
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SkPaint paint;
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make_paint(&paint);
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r.set(0, 0, SkIntToScalar(100), SkIntToScalar(20));
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// SkDebugf("--------- draw top grad\n");
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canvas->drawRect(r, paint);
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SkMatrix m;
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SkShader* s = paint.getShader();
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m.setScale(SK_Scalar1, -SK_Scalar1);
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m.postTranslate(0, SkIntToScalar(100));
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s->setLocalMatrix(m);
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r.fTop = SkIntToScalar(80);
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r.fBottom = SkIntToScalar(100);
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// SkDebugf("--------- draw bot grad\n");
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canvas->drawRect(r, paint);
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}
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class RedFilter : public SkDrawFilter {
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public:
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virtual bool filter(SkCanvas*, SkPaint* p, SkDrawFilter::Type) {
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fColor = p->getColor();
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if (fColor == SK_ColorRED) {
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p->setColor(SK_ColorGREEN);
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}
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return true;
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}
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virtual void restore(SkCanvas*, SkPaint* p, SkDrawFilter::Type) {
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p->setColor(fColor);
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}
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private:
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SkColor fColor;
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};
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class LayersView : public SkView {
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public:
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LayersView() {}
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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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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "Layers");
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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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2009-05-22 18:39:03 +04:00
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canvas->drawColor(SK_ColorGRAY);
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2008-12-17 18:59:43 +03:00
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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2009-05-22 18:39:03 +04:00
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if (true) {
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SkRect r;
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r.set(SkIntToScalar(0), SkIntToScalar(0),
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SkIntToScalar(220), SkIntToScalar(120));
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SkPaint p;
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canvas->saveLayer(&r, &p);
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canvas->drawColor(0xFFFF0000);
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2010-12-20 21:26:13 +03:00
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p.setAlpha(0); // or 0
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2009-06-24 16:41:42 +04:00
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p.setXfermodeMode(SkXfermode::kSrc_Mode);
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2009-05-22 18:39:03 +04:00
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canvas->drawOval(r, p);
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canvas->restore();
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return;
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}
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2008-12-17 18:59:43 +03:00
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if (false) {
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SkRect r;
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r.set(SkIntToScalar(0), SkIntToScalar(0),
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SkIntToScalar(220), SkIntToScalar(120));
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SkPaint p;
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p.setAlpha(0x88);
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p.setAntiAlias(true);
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if (true) {
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canvas->saveLayer(&r, &p);
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p.setColor(0xFFFF0000);
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canvas->drawOval(r, p);
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canvas->restore();
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}
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p.setColor(0xFF0000FF);
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r.offset(SkIntToScalar(20), SkIntToScalar(50));
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canvas->drawOval(r, p);
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}
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if (false) {
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SkPaint p;
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p.setAlpha(0x88);
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p.setAntiAlias(true);
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canvas->translate(SkIntToScalar(300), 0);
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SkRect r;
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r.set(SkIntToScalar(0), SkIntToScalar(0),
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SkIntToScalar(220), SkIntToScalar(60));
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canvas->saveLayer(&r, &p, (SkCanvas::SaveFlags)(SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kFullColorLayer_SaveFlag));
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// canvas->clipRect(r, SkRegion::kDifference_Op);
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// canvas->clipRect(r, SkRegion::kIntersect_Op);
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r.set(SkIntToScalar(0), SkIntToScalar(0),
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SkIntToScalar(220), SkIntToScalar(120));
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p.setColor(SK_ColorBLUE);
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canvas->drawOval(r, p);
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canvas->restore();
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return;
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}
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//canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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test_fade(canvas);
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return;
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// canvas->setDrawFilter(new RedFilter)->unref();
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SkRect r;
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SkPaint p;
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canvas->translate(SkIntToScalar(220), SkIntToScalar(20));
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p.setAntiAlias(true);
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r.set(SkIntToScalar(20), SkIntToScalar(20),
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SkIntToScalar(220), SkIntToScalar(120));
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p.setColor(SK_ColorBLUE);
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// p.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(8), SkBlurMaskFilter::kNormal_BlurStyle))->unref();
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canvas->drawRect(r, p);
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p.setMaskFilter(NULL);
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SkRect bounds = r;
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bounds.fBottom = bounds.centerY();
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canvas->saveLayer(&bounds, NULL, SkCanvas::kARGB_NoClipLayer_SaveFlag);
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p.setColor(SK_ColorRED);
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canvas->drawOval(r, p);
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p.setAlpha(0x80);
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2009-06-24 16:41:42 +04:00
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p.setXfermodeMode(SkXfermode::kDstIn_Mode);
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2008-12-17 18:59:43 +03:00
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canvas->drawRect(bounds, p);
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canvas->restore();
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}
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virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
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this->inval(NULL);
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return this->INHERITED::onFindClickHandler(x, y);
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}
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virtual bool onClick(Click* click) {
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return this->INHERITED::onClick(click);
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}
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virtual bool handleKey(SkKey key) {
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this->inval(NULL);
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return true;
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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 LayersView; }
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static SkViewRegister reg(MyFactory);
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