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