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 nullptr, 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