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