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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #include "SampleCode.h"
     10 #include "SkView.h"
     11 #include "SkCanvas.h"
     12 #include "SkAAClip.h"
     13 
     14 static void testop(const SkIRect& r0, const SkIRect& r1, SkRegion::Op op,
     15                    const SkIRect& expectedR) {
     16     SkAAClip c0, c1, c2;
     17     c0.setRect(r0);
     18     c1.setRect(r1);
     19     c2.op(c0, c1, op);
     20 
     21     SkIRect r2 = c2.getBounds();
     22     SkASSERT(r2 == expectedR);
     23 }
     24 
     25 static const struct {
     26     SkIRect r0;
     27     SkIRect r1;
     28     SkRegion::Op op;
     29     SkIRect expectedR;
     30 } gRec[] = {
     31     {{ 1, 2, 9, 3 }, { -3, 2, 5, 11 }, SkRegion::kDifference_Op, { 5, 2, 9, 3 }},
     32     {{ 1, 10, 5, 13 }, { 1, 2, 5, 11 }, SkRegion::kDifference_Op, { 1, 11, 5, 13 }},
     33     {{ 1, 10, 5, 13 }, { 1, 2, 5, 11 }, SkRegion::kReverseDifference_Op, { 1, 2, 5, 10 }},
     34 };
     35 
     36 static void testop() {
     37     for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
     38         testop(gRec[i].r0, gRec[i].r1, gRec[i].op, gRec[i].expectedR);
     39     }
     40 }
     41 
     42 static void drawClip(SkCanvas* canvas, const SkAAClip& clip) {
     43     SkMask mask;
     44     SkBitmap bm;
     45 
     46     clip.copyToMask(&mask);
     47     SkAutoMaskFreeImage amfi(mask.fImage);
     48 
     49     bm.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(),
     50                  mask.fBounds.height(), mask.fRowBytes);
     51     bm.setPixels(mask.fImage);
     52 
     53     SkPaint paint;
     54     canvas->drawBitmap(bm,
     55                        SK_Scalar1 * mask.fBounds.fLeft,
     56                        SK_Scalar1 * mask.fBounds.fTop,
     57                        &paint);
     58 }
     59 
     60 class AAClipView : public SampleView {
     61 public:
     62     AAClipView() {
     63         testop();
     64     }
     65 
     66 protected:
     67     // overrides from SkEventSink
     68     virtual bool onQuery(SkEvent* evt) {
     69         if (SampleCode::TitleQ(*evt)) {
     70             SampleCode::TitleR(evt, "AAClip");
     71             return true;
     72         }
     73         return this->INHERITED::onQuery(evt);
     74     }
     75 
     76     virtual void onDrawContent(SkCanvas* canvas) {
     77 #if 1
     78         SkAAClip aaclip;
     79         SkPath path;
     80         SkRect bounds;
     81 
     82         bounds.set(0, 0, 20, 20);
     83         bounds.inset(SK_ScalarHalf, SK_ScalarHalf);
     84 
     85 //        path.addRect(bounds);
     86 //        path.addOval(bounds);
     87         path.addRoundRect(bounds, 4, 4);
     88         aaclip.setPath(path);
     89         canvas->translate(30, 30);
     90         drawClip(canvas, aaclip);
     91 
     92         SkAAClip aaclip2;
     93         path.offset(10, 10);
     94         aaclip2.setPath(path);
     95         canvas->translate(30, 0);
     96         drawClip(canvas, aaclip2);
     97 
     98         SkAAClip aaclip3;
     99         aaclip3.op(aaclip, aaclip2, SkRegion::kIntersect_Op);
    100         canvas->translate(30, 0);
    101         drawClip(canvas, aaclip3);
    102 
    103 #endif
    104 
    105 #if 0
    106         SkRect r;
    107         r.set(0, 0, this->width(), this->height());
    108         r.inset(20, 20);
    109         canvas->clipRect(r);
    110 
    111         SkPath path;
    112         path.addRect(r);
    113         SkPaint paint;
    114         paint.setAntiAlias(true);
    115         paint.setColor(SK_ColorRED);
    116         canvas->drawPath(path, paint);
    117 #endif
    118     }
    119 
    120 private:
    121     typedef SkView INHERITED;
    122 };
    123 
    124 //////////////////////////////////////////////////////////////////////////////
    125 
    126 static SkView* MyFactory() { return new AAClipView; }
    127 static SkViewRegister reg(MyFactory);
    128 
    129