Converted AAClips SampleApp slide to GM:simpleaaclip

http://codereview.appspot.com/6220043/



git-svn-id: http://skia.googlecode.com/svn/trunk@4025 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 209 insertions, 0 deletions

diff --git a/gm/simpleaaclip.cpp b/gm/simpleaaclip.cpp
new file mode 100644
index 0000000000..6873816b20
--- /dev/null
+++ b/gm/simpleaaclip.cpp
@@ -0,0 +1,209 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "gm.h"
+#include "SkCanvas.h"
+#include "SkAAClip.h"
+
+namespace skiagm {
+
+static void paint_rgn(SkCanvas* canvas, const SkAAClip& clip,
+                      const SkPaint& paint) {
+    SkMask mask;
+    SkBitmap bm;
+
+    clip.copyToMask(&mask);
+
+    SkAutoMaskFreeImage amfi(mask.fImage);
+
+    bm.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(),
+                 mask.fBounds.height(), mask.fRowBytes);
+    bm.setPixels(mask.fImage);
+
+    // need to copy for deferred drawing test to work
+    SkBitmap bm2;
+
+    bm.deepCopyTo(&bm2, SkBitmap::kA8_Config);
+
+    canvas->drawBitmap(bm2,
+                       SK_Scalar1 * mask.fBounds.fLeft,
+                       SK_Scalar1 * mask.fBounds.fTop,
+                       &paint);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+/*
+ * This GM tests anti aliased single operation booleans with SkAAClips, 
+ * SkRect and SkPaths.
+ */
+class SimpleClipGM : public GM {
+public:
+    enum SkGeomTypes {
+        kRect_GeomType,
+        kPath_GeomType,
+        kAAClip_GeomType
+    };
+
+    SimpleClipGM(SkGeomTypes geomType)
+    : fGeomType(geomType) {
+
+        // offset the rects a bit so we get anti-aliasing in the rect case
+        fBase.set(SkFloatToScalar(100.5f), 
+                  SkFloatToScalar(100.5f), 
+                  SkFloatToScalar(150.5f), 
+                  SkFloatToScalar(150.5f));
+        fRect = fBase;
+        fRect.inset(5, 5);
+        fRect.offset(25, 25);
+
+        fBasePath.addRoundRect(fBase, SkIntToScalar(5), SkIntToScalar(5));
+        fRectPath.addRoundRect(fRect, SkIntToScalar(5), SkIntToScalar(5));
+        INHERITED::setBGColor(0xFFDDDDDD);
+    }
+
+protected:
+    void buildRgn(SkAAClip* clip, SkRegion::Op op) {
+        clip->setPath(fBasePath, NULL, true);
+
+        SkAAClip clip2;
+        clip2.setPath(fRectPath, NULL, true);
+        clip->op(clip2, op);
+    }
+
+    void drawOrig(SkCanvas* canvas) {
+        SkPaint     paint;
+        
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setColor(SK_ColorBLACK);
+        
+        canvas->drawRect(fBase, paint);
+        canvas->drawRect(fRect, paint);
+    }
+    
+    void drawRgnOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
+
+        SkAAClip clip;
+
+        this->buildRgn(&clip, op);
+        this->drawOrig(canvas);
+
+        SkPaint paint;
+        paint.setColor(color);
+        paint_rgn(canvas, clip, paint);
+    }
+
+    void drawPathsOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
+
+        this->drawOrig(canvas);
+
+        canvas->save();
+
+        // create the clip mask with the supplied boolean op
+        if (kPath_GeomType == fGeomType) {
+            // path-based case
+            canvas->clipPath(fBasePath, SkRegion::kReplace_Op, true);
+            canvas->clipPath(fRectPath, op, true);
+        } else {
+            // rect-based case
+            canvas->clipRect(fBase, SkRegion::kReplace_Op, true);
+            canvas->clipRect(fRect, op, true);
+        }
+
+        // draw a rect that will entirely cover the clip mask area
+        SkPaint paint;
+        paint.setColor(color);
+
+        SkRect r = SkRect::MakeLTRB(SkIntToScalar(90),  SkIntToScalar(90),
+                                    SkIntToScalar(180), SkIntToScalar(180));
+
+        canvas->drawRect(r, paint);
+
+        canvas->restore();
+    }
+
+    virtual SkString onShortName() {
+        SkString str;
+        str.printf("simpleaaclip_%s", 
+                    kRect_GeomType == fGeomType ? "rect" :
+                    (kPath_GeomType == fGeomType ? "path" : 
+                    "aaclip"));
+        return str;
+    }
+
+    virtual SkISize onISize() {
+        return make_isize(640, 480);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+
+        static const struct {
+            SkColor         fColor;
+            const char*     fName;
+            SkRegion::Op    fOp;
+        } gOps[] = {
+            { SK_ColorBLACK,    "Difference", SkRegion::kDifference_Op    },
+            { SK_ColorRED,      "Intersect",  SkRegion::kIntersect_Op     },
+            { 0xFF008800,       "Union",      SkRegion::kUnion_Op         },
+            { SK_ColorBLUE,     "XOR",        SkRegion::kXOR_Op           },
+            { SK_ColorGREEN,    "Rev Diff",   SkRegion::kReverseDifference_Op },
+            { SK_ColorYELLOW,   "Replace",    SkRegion::kReplace_Op       }
+        };
+
+        SkPaint textPaint;
+        textPaint.setAntiAlias(true);
+        textPaint.setTextSize(SK_Scalar1*24);
+
+        for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); op++) {
+            canvas->drawText(gOps[op].fName, strlen(gOps[op].fName),
+                             SkIntToScalar(75), SkIntToScalar(50), 
+                             textPaint);
+
+            if (kAAClip_GeomType == fGeomType) {
+                this->drawRgnOped(canvas, gOps[op].fOp, gOps[op].fColor);
+            } else {
+                this->drawPathsOped(canvas, gOps[op].fOp, gOps[op].fColor);
+            }
+
+            if (op && !(op % 3)) {
+                canvas->translate(SkIntToScalar(-600), SkIntToScalar(250));
+            } else {
+                canvas->translate(SkIntToScalar(200), 0);
+            }
+        }
+    }
+private:
+
+    SkGeomTypes fGeomType;
+
+    SkRect fBase;
+    SkRect fRect;
+
+    SkPath fBasePath;       // fBase as a round rect
+    SkPath fRectPath;       // fRect as a round rect
+
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+// rects
+static GM* MyFactory(void*) { return new SimpleClipGM(
+                                            SimpleClipGM::kRect_GeomType); }
+static GMRegistry reg(MyFactory);
+
+// paths
+static GM* MyFactory2(void*) { return new SimpleClipGM(
+                                            SimpleClipGM::kPath_GeomType); }
+static GMRegistry reg2(MyFactory2);
+
+// aa clip
+static GM* MyFactory3(void*) { return new SimpleClipGM(
+                                            SimpleClipGM::kAAClip_GeomType); }
+static GMRegistry reg3(MyFactory3);
+
+}