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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 #include "SampleCode.h"
9 #include "SkColorPriv.h"
10 #include "SkShader.h"
11 #include "SkView.h"
12 #include "SkCanvas.h"
13 #include "SkUtils.h"
14 
make_bitmap()15 static SkBitmap make_bitmap() {
16     const int N = 1;
17 
18     SkPMColor c[N];
19     for (int i = 0; i < N; i++) {
20         c[i] = SkPackARGB32(0x80, 0x80, 0, 0);
21     }
22     SkColorTable* ctable = new SkColorTable(c, N);
23 
24     SkBitmap bm;
25     bm.allocPixels(SkImageInfo::Make(1, 1, kIndex_8_SkColorType,
26                                      kPremul_SkAlphaType),
27                    NULL, ctable);
28     ctable->unref();
29 
30     bm.lockPixels();
31     for (int y = 0; y < bm.height(); y++) {
32         uint8_t* p = bm.getAddr8(0, y);
33         for (int x = 0; x < bm.width(); x++) {
34             p[x] = 0;
35         }
36     }
37     bm.unlockPixels();
38     return bm;
39 }
40 
41 class TinyBitmapView : public SampleView {
42     SkBitmap    fBM;
43 public:
TinyBitmapView()44     TinyBitmapView() {
45         fBM = make_bitmap();
46         this->setBGColor(0xFFDDDDDD);
47     }
48 
49 protected:
50     // overrides from SkEventSink
onQuery(SkEvent * evt)51     virtual bool onQuery(SkEvent* evt) {
52         if (SampleCode::TitleQ(*evt)) {
53             SampleCode::TitleR(evt, "TinyBitmap");
54             return true;
55         }
56         return this->INHERITED::onQuery(evt);
57     }
58 
setBitmapOpaque(SkBitmap * bm,bool isOpaque)59     static void setBitmapOpaque(SkBitmap* bm, bool isOpaque) {
60         SkAutoLockPixels alp(*bm);  // needed for ctable
61         bm->setAlphaType(isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
62     }
63 
onDrawContent(SkCanvas * canvas)64     virtual void onDrawContent(SkCanvas* canvas) {
65         SkShader* s = SkShader::CreateBitmapShader(fBM, SkShader::kRepeat_TileMode,
66                                                    SkShader::kMirror_TileMode);
67         SkPaint paint;
68         paint.setShader(s)->unref();
69         canvas->drawPaint(paint);
70     }
71 
72 private:
73     typedef SkView INHERITED;
74 };
75 
76 //////////////////////////////////////////////////////////////////////////////
77 
MyFactory()78 static SkView* MyFactory() { return new TinyBitmapView; }
79 static SkViewRegister reg(MyFactory);
80