Skia Merge (revision 1510)

This CL includes bug fixes and closely mirrors the version of
Skia used in Chrome M13, which is likely to be our baseline for
ICS.

The CL also adds source files for the SampleApp which will allow
us to execute basic skia tests. The SampleApp requires the
utils/views directory in order to run.

Finally, we have included the PDF backend for Skia in order to
experiment with using it to generate PDF files for certain
applications.

Note: The SampleApp and PDF code are not built as part of libskia.

Change-Id: I1895ccfbd8074e25f19148cc7bd1b4af571fb307

1 files changed, 189 insertions, 0 deletions

diff --git a/samplecode/SampleCull.cpp b/samplecode/SampleCull.cpp
new file mode 100644
index 0000000..7b4eab6
--- /dev/null
+++ b/samplecode/SampleCull.cpp
@@ -0,0 +1,189 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkCornerPathEffect.h"
+#include "SkCullPoints.h"
+#include "SkGradientShader.h"
+#include "SkPath.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkRandom.h"
+
+static void addbump(SkPath* path, const SkPoint pts[2], SkScalar bump) {
+    SkVector    tang;
+    
+    tang.setLength(pts[1].fX - pts[0].fX, pts[1].fY - pts[0].fY, bump);
+
+    path->lineTo(SkScalarHalf(pts[0].fX + pts[1].fX) - tang.fY,
+                 SkScalarHalf(pts[0].fY + pts[1].fY) + tang.fX);
+    path->lineTo(pts[1]);
+}
+
+static void subdivide(SkPath* path, SkScalar bump) {
+    SkPath::Iter    iter(*path, false);
+    SkPoint         pts[4];
+    SkPath          tmp;
+    
+    for (;;)
+        switch (iter.next(pts)) {
+        case SkPath::kMove_Verb:
+            tmp.moveTo(pts[0]);
+            break;
+        case SkPath::kLine_Verb:
+            addbump(&tmp, pts, bump);
+            bump = -bump;
+            break;
+        case SkPath::kDone_Verb:
+            goto FINISH;
+        default:
+            break;
+        }
+
+FINISH:
+    path->swap(tmp);
+}
+
+static SkIPoint* getpts(const SkPath& path, int* count) {
+    SkPoint     pts[4];
+    int         n = 1;
+    SkIPoint*   array;
+
+    {
+        SkPath::Iter    iter(path, false);
+        for (;;)
+            switch (iter.next(pts)) {
+            case SkPath::kLine_Verb:
+                n += 1;
+                break;
+            case SkPath::kDone_Verb:
+                goto FINISHED;
+            default:
+                break;
+            }
+    }
+
+FINISHED:
+    array = new SkIPoint[n];
+    n = 0;
+
+    {
+        SkPath::Iter    iter(path, false);
+        for (;;)
+            switch (iter.next(pts)) {
+            case SkPath::kMove_Verb:
+                array[n++].set(SkScalarRound(pts[0].fX), SkScalarRound(pts[0].fY));
+                break;
+            case SkPath::kLine_Verb:
+                array[n++].set(SkScalarRound(pts[1].fX), SkScalarRound(pts[1].fY));
+                break;
+            case SkPath::kDone_Verb:
+                goto FINISHED2;
+            default:
+                break;
+            }
+    }
+    
+FINISHED2:
+    *count = n;
+    return array;
+}
+
+static SkScalar nextScalarRange(SkRandom& rand, SkScalar min, SkScalar max) {
+    return min + SkScalarMul(rand.nextUScalar1(), max - min);
+}
+
+class CullView : public SampleView {
+public:
+	CullView() {
+        fClip.set(0, 0, SkIntToScalar(160), SkIntToScalar(160));
+        
+        SkRandom    rand;
+        
+        for (int i = 0; i < 50; i++) {
+            SkScalar x = nextScalarRange(rand, -fClip.width()*1, fClip.width()*2);
+            SkScalar y = nextScalarRange(rand, -fClip.height()*1, fClip.height()*2);
+            if (i == 0)
+                fPath.moveTo(x, y);
+            else
+                fPath.lineTo(x, y);
+        }
+        
+        SkScalar bump = fClip.width()/8;
+        subdivide(&fPath, bump);
+        subdivide(&fPath, bump);
+        subdivide(&fPath, bump);
+        fPoints = getpts(fPath, &fPtCount);
+        
+        this->setBGColor(0xFFDDDDDD);
+    }
+    
+    virtual ~CullView() {
+        delete[] fPoints;
+    }
+
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "Culling");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    virtual void onDrawContent(SkCanvas* canvas) {
+        SkAutoCanvasRestore ar(canvas, true);
+
+        canvas->translate(  SkScalarHalf(this->width() - fClip.width()),
+                            SkScalarHalf(this->height() - fClip.height()));
+
+   //     canvas->scale(SK_Scalar1*3, SK_Scalar1*3, 0, 0);
+
+        SkPaint paint;
+        
+    //    paint.setAntiAliasOn(true);
+        paint.setStyle(SkPaint::kStroke_Style);
+
+        canvas->drawRect(fClip, paint);
+
+#if 1
+        paint.setColor(0xFF555555);
+        paint.setStrokeWidth(SkIntToScalar(2));
+//        paint.setPathEffect(new SkCornerPathEffect(SkIntToScalar(30)))->unref();
+        canvas->drawPath(fPath, paint);
+//        paint.setPathEffect(NULL);
+#endif
+
+        SkPath  tmp;
+        SkIRect iclip;
+        fClip.round(&iclip);
+        
+        SkCullPointsPath    cpp(iclip, &tmp);
+        
+        cpp.moveTo(fPoints[0].fX, fPoints[0].fY);
+        for (int i = 0; i < fPtCount; i++)
+            cpp.lineTo(fPoints[i].fX, fPoints[i].fY);
+        
+        paint.setColor(SK_ColorRED);
+        paint.setStrokeWidth(SkIntToScalar(3));
+        paint.setStrokeJoin(SkPaint::kRound_Join);
+        canvas->drawPath(tmp, paint);
+        
+        this->inval(NULL);
+    }
+    
+private:
+    SkRect      fClip;
+    SkIPoint*   fPoints;
+    SkPath      fPath;
+    int         fPtCount;
+
+    typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new CullView; }
+static SkViewRegister reg(MyFactory);
+