Sample that exercises complex clipping variations.

git-svn-id: http://skia.googlecode.com/svn/trunk@875 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 181 insertions, 0 deletions

diff --git a/samplecode/SampleComplexClip.cpp b/samplecode/SampleComplexClip.cpp
new file mode 100644
index 0000000000..c01a9a30e7
--- /dev/null
+++ b/samplecode/SampleComplexClip.cpp
@@ -0,0 +1,181 @@
+#include "SampleCode.h"
+#include "SkCanvas.h"
+#include "SkParsePath.h"
+#include "SkPath.h"
+#include "SkRandom.h"
+#include "SkView.h"
+
+static void scale_to_width(SkPath* path, SkScalar dstWidth) {
+    const SkRect& bounds = path->getBounds();
+    SkScalar scale = dstWidth / bounds.width();
+    SkMatrix matrix;
+
+    matrix.setScale(scale, scale);
+    path->transform(matrix);
+}
+
+static const struct {
+    SkPaint::Style  fStyle;
+    SkPaint::Join   fJoin;
+    int             fStrokeWidth;
+} gRec[] = {
+    { SkPaint::kFill_Style,             SkPaint::kMiter_Join,   0 },
+    { SkPaint::kStroke_Style,           SkPaint::kMiter_Join,   0 },
+    { SkPaint::kStroke_Style,           SkPaint::kMiter_Join,   10 },
+    { SkPaint::kStrokeAndFill_Style,    SkPaint::kMiter_Join,   10 },
+};
+
+#define TEST_INVERSE 0
+
+class ComplexClipView : public SkView {
+    SkScalar    fWidth;
+public:
+	ComplexClipView() {
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "ComplexClip");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SkColorSetRGB(0xA0,0xDD,0xA0));
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        SkPath path;
+        path.moveTo(SkIntToScalar(0),   SkIntToScalar(50));
+        path.quadTo(SkIntToScalar(0),   SkIntToScalar(0),   SkIntToScalar(50),  SkIntToScalar(0));
+        path.lineTo(SkIntToScalar(175), SkIntToScalar(0));
+        path.quadTo(SkIntToScalar(200), SkIntToScalar(0),   SkIntToScalar(200), SkIntToScalar(25));
+        path.lineTo(SkIntToScalar(200), SkIntToScalar(150));
+        path.quadTo(SkIntToScalar(200), SkIntToScalar(200), SkIntToScalar(150), SkIntToScalar(200));
+        path.lineTo(SkIntToScalar(0),   SkIntToScalar(200));
+        path.close();
+        path.moveTo(SkIntToScalar(50),  SkIntToScalar(50));
+        path.lineTo(SkIntToScalar(150), SkIntToScalar(50));
+        path.lineTo(SkIntToScalar(150), SkIntToScalar(125));
+        path.quadTo(SkIntToScalar(150), SkIntToScalar(150), SkIntToScalar(125), SkIntToScalar(150));
+        path.lineTo(SkIntToScalar(50),  SkIntToScalar(150));
+        path.close();
+        path.setFillType(SkPath::kEvenOdd_FillType);
+        SkColor pathColor = SK_ColorBLACK;
+        SkPaint pathPaint;
+        pathPaint.setAntiAlias(true);
+        pathPaint.setColor(pathColor);
+
+        SkPath clipA;
+        clipA.moveTo(SkIntToScalar(10),  SkIntToScalar(20));
+        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(22));
+        clipA.lineTo(SkIntToScalar(70),  SkIntToScalar(105));
+        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(177));
+        clipA.lineTo(SkIntToScalar(-5),  SkIntToScalar(180));
+        clipA.close();
+        SkColor colorA = SK_ColorCYAN;
+
+        SkPath clipB;
+        clipB.moveTo(SkIntToScalar(40),  SkIntToScalar(10));
+        clipB.lineTo(SkIntToScalar(190), SkIntToScalar(15));
+        clipB.lineTo(SkIntToScalar(195), SkIntToScalar(190));
+        clipB.lineTo(SkIntToScalar(40),  SkIntToScalar(185));
+        clipB.lineTo(SkIntToScalar(155), SkIntToScalar(100));
+        clipB.close();
+        SkColor colorB = SK_ColorRED;
+
+        drawBG(canvas);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setStrokeWidth(0);
+
+        canvas->translate(SkIntToScalar(10),SkIntToScalar(10));
+        canvas->drawPath(path, pathPaint);
+        paint.setColor(colorA);
+        canvas->drawPath(clipA, paint);
+        paint.setColor(colorB);
+        canvas->drawPath(clipB, paint);
+
+        static const struct {
+            SkRegion::Op fOp;
+            const char*  fName;
+        } gOps[] = { //extra spaces in names for measureText
+            {SkRegion::kIntersect_Op,         "Isect "},
+            {SkRegion::kDifference_Op,        "Diff " },
+            {SkRegion::kUnion_Op,             "Union "},
+            {SkRegion::kXOR_Op,               "Xor "  },
+            {SkRegion::kReverseDifference_Op, "RDiff "}
+        };
+
+        canvas->translate(0, SkIntToScalar(40));
+        canvas->scale(3 * SK_Scalar1 / 4, 3 * SK_Scalar1 / 4);
+        canvas->save();
+
+        int invALimit = TEST_INVERSE ? 1 : 2;
+        for (int invA = 0; invALimit < 2; ++invA) {
+            for (int op = 0; op < SK_ARRAY_COUNT(gOps); ++op) {
+                int idx = invA * SK_ARRAY_COUNT(gOps) + op;
+                if (!(idx % 3)) {
+                    canvas->restore();
+                    canvas->translate(0, SkIntToScalar(250));
+                    canvas->save();
+                }
+                canvas->save();
+                    // set clip
+                    clipA.setFillType(invA ? SkPath::kInverseEvenOdd_FillType :
+                                             SkPath::kEvenOdd_FillType);
+                    canvas->clipPath(clipA);
+                    canvas->clipPath(clipB, gOps[op].fOp);
+
+                    // draw path clipped
+                    canvas->drawPath(path, pathPaint);
+                canvas->restore();
+
+                // draw path in hairline
+                paint.setColor(pathColor);
+                canvas->drawPath(path, paint);
+
+                // draw clips in hair line
+                paint.setColor(colorA);
+                canvas->drawPath(clipA, paint);
+                paint.setColor(colorB);
+                canvas->drawPath(clipB, paint);
+
+                paint.setTextSize(SkIntToScalar(20));
+
+                SkScalar txtX = SkIntToScalar(55);
+                paint.setColor(colorA);
+                const char* aTxt = invA ? "InverseA " : "A ";
+                canvas->drawText(aTxt, strlen(aTxt), txtX, SkIntToScalar(220), paint);
+                txtX += paint.measureText(aTxt, strlen(aTxt));
+                paint.setColor(SK_ColorBLACK);
+                canvas->drawText(gOps[op].fName, strlen(gOps[op].fName),
+                                    txtX, SkIntToScalar(220), paint);
+                txtX += paint.measureText(gOps[op].fName, strlen(gOps[op].fName));
+                paint.setColor(colorB);
+                canvas->drawText("B", 1, txtX, SkIntToScalar(220), paint);
+
+                canvas->translate(SkIntToScalar(250),0);
+            }
+        }
+        canvas->restore();
+    }
+
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+        this->inval(NULL);
+        return this->INHERITED::onFindClickHandler(x, y);
+    }
+private:
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new ComplexClipView; }
+static SkViewRegister reg(MyFactory);
+