grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 259 insertions, 0 deletions

diff --git a/samplecode/SampleLayers.cpp b/samplecode/SampleLayers.cpp
new file mode 100644
index 0000000000..fcf71070c3
--- /dev/null
+++ b/samplecode/SampleLayers.cpp
@@ -0,0 +1,259 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkBlurMaskFilter.h"
+#include "SkCamera.h"
+#include "SkColorFilter.h"
+#include "SkColorPriv.h"
+#include "SkDevice.h"
+#include "SkGradientShader.h"
+#include "SkImageDecoder.h"
+#include "SkInterpolator.h"
+#include "SkMaskFilter.h"
+#include "SkPath.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkShaderExtras.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+#include "SkUtils.h"
+#include "SkKey.h"
+#include "SkPorterDuff.h"
+#include "SkXfermode.h"
+#include "SkDrawFilter.h"
+
+static void make_paint(SkPaint* paint) {
+    SkColor colors[] = { 0, SK_ColorWHITE };
+    SkPoint pts[] = { 0, 0, 0, SK_Scalar1*20 };
+    SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+    
+    paint->setShader(s)->unref();
+    paint->setXfermode(SkPorterDuff::CreateXfermode(SkPorterDuff::kDstIn_Mode))->unref();
+}
+
+static void dump_layers(const char label[], SkCanvas* canvas) {
+    SkDebugf("Dump Layers(%s)\n", label);
+
+    SkCanvas::LayerIter iter(canvas, true);
+    int index = 0;
+    while (!iter.done()) {
+        const SkBitmap& bm = iter.device()->accessBitmap(false);
+        const SkIRect& clip = iter.clip().getBounds();
+        SkDebugf("Layer[%d] bitmap [%d %d] X=%d Y=%d clip=[%d %d %d %d] alpha=%d\n", index++,
+                 bm.width(), bm.height(), iter.x(), iter.y(),
+                 clip.fLeft, clip.fTop, clip.fRight, clip.fBottom,
+                 iter.paint().getAlpha());
+        iter.next();
+    }
+}
+
+// test drawing with strips of fading gradient above and below
+static void test_fade(SkCanvas* canvas) {
+    SkAutoCanvasRestore ar(canvas, true);
+
+    SkRect r;
+    
+    SkPaint p;
+    p.setAlpha(0x88);
+
+    SkAutoCanvasRestore(canvas, false);
+
+    // create the layers
+
+    r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100));
+    canvas->clipRect(r);
+    
+    r.fBottom = SkIntToScalar(20);
+    canvas->saveLayer(&r, NULL, (SkCanvas::SaveFlags)(SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kFullColorLayer_SaveFlag));
+
+    r.fTop = SkIntToScalar(80);
+    r.fBottom = SkIntToScalar(100);
+    canvas->saveLayer(&r, NULL, (SkCanvas::SaveFlags)(SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kFullColorLayer_SaveFlag));
+    
+    // now draw the "content" 
+
+    if (true) {
+        r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100));
+
+        canvas->saveLayerAlpha(&r, 0x80);
+
+        SkPaint p;
+        p.setColor(SK_ColorRED);
+        p.setAntiAlias(true);
+        canvas->drawOval(r, p);
+        
+        dump_layers("inside layer alpha", canvas);
+        
+        canvas->restore();
+    } else {
+        r.set(0, 0, SkIntToScalar(100), SkIntToScalar(100));
+        
+        SkPaint p;
+        p.setColor(SK_ColorRED);
+        p.setAntiAlias(true);
+        canvas->drawOval(r, p);
+    }
+    
+//    return;
+
+    dump_layers("outside layer alpha", canvas);
+
+    // now apply an effect
+
+    SkPaint paint;
+    make_paint(&paint);
+    r.set(0, 0, SkIntToScalar(100), SkIntToScalar(20));
+//    SkDebugf("--------- draw top grad\n");
+    canvas->drawRect(r, paint);
+
+    SkMatrix m;
+    SkShader* s = paint.getShader();
+    m.setScale(SK_Scalar1, -SK_Scalar1);
+    m.postTranslate(0, SkIntToScalar(100));
+    s->setLocalMatrix(m);
+    
+    r.fTop = SkIntToScalar(80);
+    r.fBottom = SkIntToScalar(100);
+//    SkDebugf("--------- draw bot grad\n");
+    canvas->drawRect(r, paint);
+}
+
+class RedFilter : public SkDrawFilter {
+public:
+    virtual bool filter(SkCanvas*, SkPaint* p, SkDrawFilter::Type) {
+        fColor = p->getColor();
+        if (fColor == SK_ColorRED) {
+            p->setColor(SK_ColorGREEN);
+        }
+        return true;
+    }
+    virtual void restore(SkCanvas*, SkPaint* p, SkDrawFilter::Type) {
+        p->setColor(fColor);
+    }
+    
+private:
+    SkColor fColor;
+};
+
+class LayersView : public SkView {
+public:
+	LayersView() {}
+
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "Layers");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorWHITE);
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+        
+        if (false) {
+            SkRect r;
+			r.set(SkIntToScalar(0), SkIntToScalar(0),
+				  SkIntToScalar(220), SkIntToScalar(120));
+            SkPaint p;
+            p.setAlpha(0x88);
+            p.setAntiAlias(true);
+            
+            if (true) {
+                canvas->saveLayer(&r, &p);
+                p.setColor(0xFFFF0000);
+                canvas->drawOval(r, p);
+                canvas->restore();
+            }
+
+            p.setColor(0xFF0000FF);
+            r.offset(SkIntToScalar(20), SkIntToScalar(50));
+            canvas->drawOval(r, p);
+        }
+
+        if (false) {
+            SkPaint p;
+            p.setAlpha(0x88);
+            p.setAntiAlias(true);
+
+            canvas->translate(SkIntToScalar(300), 0);
+
+            SkRect r;
+			r.set(SkIntToScalar(0), SkIntToScalar(0),
+				  SkIntToScalar(220), SkIntToScalar(60));
+
+            canvas->saveLayer(&r, &p, (SkCanvas::SaveFlags)(SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kFullColorLayer_SaveFlag));
+//            canvas->clipRect(r, SkRegion::kDifference_Op);
+//            canvas->clipRect(r, SkRegion::kIntersect_Op);
+
+			r.set(SkIntToScalar(0), SkIntToScalar(0),
+				  SkIntToScalar(220), SkIntToScalar(120));
+            p.setColor(SK_ColorBLUE);
+            canvas->drawOval(r, p);
+            canvas->restore();
+            return;
+        }
+        
+        //canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
+        test_fade(canvas);
+        return;
+
+    //    canvas->setDrawFilter(new RedFilter)->unref();
+        
+        SkRect  r;
+        SkPaint p;
+        
+        canvas->translate(SkIntToScalar(220), SkIntToScalar(20));
+        
+        p.setAntiAlias(true);
+        r.set(SkIntToScalar(20), SkIntToScalar(20),
+              SkIntToScalar(220), SkIntToScalar(120));
+        
+        p.setColor(SK_ColorBLUE);
+     //   p.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(8), SkBlurMaskFilter::kNormal_BlurStyle))->unref();
+        canvas->drawRect(r, p);
+        p.setMaskFilter(NULL);
+
+        SkRect bounds = r;
+        bounds.fBottom = bounds.centerY();
+        canvas->saveLayer(&bounds, NULL, SkCanvas::kARGB_NoClipLayer_SaveFlag);
+
+        p.setColor(SK_ColorRED);
+        canvas->drawOval(r, p);
+        
+        p.setAlpha(0x80);
+        p.setPorterDuffXfermode(SkPorterDuff::kDstIn_Mode);
+        canvas->drawRect(bounds, p);
+
+        canvas->restore();
+    }
+    
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+        this->inval(NULL);
+        
+        return this->INHERITED::onFindClickHandler(x, y);
+    }
+    
+    virtual bool onClick(Click* click) {
+        return this->INHERITED::onClick(click);
+    }
+
+	virtual bool handleKey(SkKey key) {
+        this->inval(NULL);
+        return true;
+    }
+
+private:
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new LayersView; }
+static SkViewRegister reg(MyFactory);
+