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 "SkCanvas.h"
10 #include "SkColorPriv.h"
11 #include "SkGradientShader.h"
12 #include "SkPath.h"
13 #include "SkRegion.h"
14 #include "SkUtils.h"
15 #include "SkView.h"
16
draw_rect(SkCanvas * canvas,const SkRect & r,const SkPaint & p)17 static void draw_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
18 canvas->drawRect(r, p);
19
20 SkPaint frame(p);
21 frame.setShader(nullptr);
22 frame.setStyle(SkPaint::kStroke_Style);
23 canvas->drawRect(r, frame);
24 }
25
draw_gradient(SkCanvas * canvas)26 static void draw_gradient(SkCanvas* canvas) {
27 SkRect r = { 0, 0, SkIntToScalar(256), SkIntToScalar(32) };
28 SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fTop } };
29 SkColor colors[] = { 0xFF000000, 0xFFFF0000 };
30 SkPaint p;
31 p.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode));
32 draw_rect(canvas, r, p);
33
34 canvas->translate(0, SkIntToScalar(40));
35 p.setDither(true);
36 draw_rect(canvas, r, p);
37 }
38
test_pathregion()39 static bool test_pathregion() {
40 SkPath path;
41 SkRegion region;
42 path.moveTo(25071800.f, -141823808.f);
43 path.lineTo(25075500.f, -141824000.f);
44 path.lineTo(25075400.f, -141827712.f);
45 path.lineTo(25071810.f, -141827600.f);
46 path.close();
47
48 SkIRect bounds;
49 path.getBounds().round(&bounds);
50 SkRegion clip(bounds);
51 return region.setPath(path, clip); // <-- !! DOWN !!
52 }
53
make_bitmap()54 static SkBitmap make_bitmap() {
55 SkPMColor c[256];
56 for (int i = 0; i < 256; i++) {
57 c[i] = SkPackARGB32(0xFF, i, 0, 0);
58 }
59 SkColorTable* ctable = new SkColorTable(c, 256);
60
61 SkBitmap bm;
62 bm.allocPixels(SkImageInfo::Make(256, 32, kIndex_8_SkColorType, kPremul_SkAlphaType),
63 nullptr, ctable);
64 ctable->unref();
65
66 bm.lockPixels();
67 for (int y = 0; y < bm.height(); y++) {
68 uint8_t* p = bm.getAddr8(0, y);
69 for (int x = 0; x < 256; x++) {
70 p[x] = x;
71 }
72 }
73 bm.unlockPixels();
74 return bm;
75 }
76
77 class DitherBitmapView : public SampleView {
78 SkBitmap fBM8;
79 SkBitmap fBM32;
80 bool fResult;
81 public:
DitherBitmapView()82 DitherBitmapView() {
83 fResult = test_pathregion();
84 fBM8 = make_bitmap();
85 fBM8.copyTo(&fBM32, kN32_SkColorType);
86
87 this->setBGColor(0xFFDDDDDD);
88 }
89
90 protected:
91 // overrides from SkEventSink
onQuery(SkEvent * evt)92 virtual bool onQuery(SkEvent* evt) {
93 if (SampleCode::TitleQ(*evt)) {
94 SampleCode::TitleR(evt, "DitherBitmap");
95 return true;
96 }
97 return this->INHERITED::onQuery(evt);
98 }
99
setBitmapOpaque(SkBitmap * bm,bool isOpaque)100 static void setBitmapOpaque(SkBitmap* bm, bool isOpaque) {
101 SkAutoLockPixels alp(*bm); // needed for ctable
102 bm->setAlphaType(isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
103 }
104
draw2(SkCanvas * canvas,const SkBitmap & bm)105 static void draw2(SkCanvas* canvas, const SkBitmap& bm) {
106 SkPaint paint;
107 SkBitmap bitmap(bm);
108
109 setBitmapOpaque(&bitmap, false);
110 paint.setDither(false);
111 canvas->drawBitmap(bitmap, 0, 0, &paint);
112 paint.setDither(true);
113 canvas->drawBitmap(bitmap, 0, SkIntToScalar(bm.height() + 10), &paint);
114
115 setBitmapOpaque(&bitmap, true);
116 SkScalar x = SkIntToScalar(bm.width() + 10);
117 paint.setDither(false);
118 canvas->drawBitmap(bitmap, x, 0, &paint);
119 paint.setDither(true);
120 canvas->drawBitmap(bitmap, x, SkIntToScalar(bm.height() + 10), &paint);
121 }
122
onDrawContent(SkCanvas * canvas)123 virtual void onDrawContent(SkCanvas* canvas) {
124 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
125
126 draw2(canvas, fBM8);
127 canvas->translate(0, SkIntToScalar(fBM8.height() *3));
128 draw2(canvas, fBM32);
129
130 canvas->translate(0, SkIntToScalar(fBM8.height() *3));
131 draw_gradient(canvas);
132
133 char resultTrue[] = "SkRegion::setPath returned true";
134 char resultFalse[] = "SkRegion::setPath returned false";
135 SkPaint p;
136 if (fResult)
137 canvas->drawText(resultTrue, sizeof(resultTrue) - 1, 0, 50, p);
138 else
139 canvas->drawText(resultFalse, sizeof(resultFalse) - 1, 0, 50, p);
140 }
141
142 private:
143 typedef SampleView INHERITED;
144 };
145
146 //////////////////////////////////////////////////////////////////////////////
147
MyFactory()148 static SkView* MyFactory() { return new DitherBitmapView; }
149 static SkViewRegister reg(MyFactory);
150