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      1 /*
      2  * Copyright 2011 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SampleCode.h"
      9 #include "SkAAClip.h"
     10 #include "SkCanvas.h"
     11 #include "SkPath.h"
     12 #include "SkView.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     SkDEBUGCODE(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.installMaskPixels(mask);
     50 
     51     SkPaint paint;
     52     canvas->drawBitmap(bm,
     53                        SK_Scalar1 * mask.fBounds.fLeft,
     54                        SK_Scalar1 * mask.fBounds.fTop,
     55                        &paint);
     56 }
     57 
     58 class AAClipView : public SampleView {
     59 public:
     60     AAClipView() {
     61         testop();
     62     }
     63 
     64 protected:
     65     // overrides from SkEventSink
     66     virtual bool onQuery(SkEvent* evt) {
     67         if (SampleCode::TitleQ(*evt)) {
     68             SampleCode::TitleR(evt, "AAClip");
     69             return true;
     70         }
     71         return this->INHERITED::onQuery(evt);
     72     }
     73 
     74     virtual void onDrawContent(SkCanvas* canvas) {
     75 #if 1
     76         SkAAClip aaclip;
     77         SkPath path;
     78         SkRect bounds;
     79 
     80         bounds.set(0, 0, 20, 20);
     81         bounds.inset(SK_ScalarHalf, SK_ScalarHalf);
     82 
     83 //        path.addRect(bounds);
     84 //        path.addOval(bounds);
     85         path.addRoundRect(bounds, 4, 4);
     86         aaclip.setPath(path);
     87         canvas->translate(30, 30);
     88         drawClip(canvas, aaclip);
     89 
     90         SkAAClip aaclip2;
     91         path.offset(10, 10);
     92         aaclip2.setPath(path);
     93         canvas->translate(30, 0);
     94         drawClip(canvas, aaclip2);
     95 
     96         SkAAClip aaclip3;
     97         aaclip3.op(aaclip, aaclip2, SkRegion::kIntersect_Op);
     98         canvas->translate(30, 0);
     99         drawClip(canvas, aaclip3);
    100 
    101 #endif
    102 
    103 #if 0
    104         SkRect r;
    105         r.set(0, 0, this->width(), this->height());
    106         r.inset(20, 20);
    107         canvas->clipRect(r);
    108 
    109         SkPath path;
    110         path.addRect(r);
    111         SkPaint paint;
    112         paint.setAntiAlias(true);
    113         paint.setColor(SK_ColorRED);
    114         canvas->drawPath(path, paint);
    115 #endif
    116     }
    117 
    118 private:
    119     typedef SkView INHERITED;
    120 };
    121 
    122 //////////////////////////////////////////////////////////////////////////////
    123 
    124 static SkView* MyFactory() { return new AAClipView; }
    125 static SkViewRegister reg(MyFactory);
    126