1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkAndroidCodec.h"
#include "SkAnimatedImage.h"
#include "SkAnimTimer.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkPictureRecorder.h"
#include "SkRect.h"
#include "SkScalar.h"
#include "SkString.h"
#include "SampleCode.h"
#include "Resources.h"
static constexpr char kPauseKey = 'p';
static constexpr char kResetKey = 'r';
class SampleAnimatedImage : public SampleView {
public:
SampleAnimatedImage()
: INHERITED()
, fYOffset(0)
{}
protected:
void onDrawBackground(SkCanvas* canvas) override {
SkPaint paint;
paint.setAntiAlias(true);
constexpr SkScalar kTextSize = 20;
paint.setTextSize(kTextSize);
SkString str = SkStringPrintf("Press '%c' to start/pause; '%c' to reset.",
kPauseKey, kResetKey);
const char* text = str.c_str();
SkRect bounds;
paint.measureText(text, strlen(text), &bounds);
fYOffset = bounds.height();
canvas->drawText(text, strlen(text), 5, fYOffset, paint);
fYOffset *= 2;
}
void onDrawContent(SkCanvas* canvas) override {
if (!fImage) {
return;
}
canvas->translate(0, fYOffset);
canvas->drawDrawable(fImage.get());
canvas->drawDrawable(fDrawable.get(), fImage->getBounds().width(), 0);
}
bool onAnimate(const SkAnimTimer& animTimer) override {
if (!fImage) {
return false;
}
const double lastWallTime = fLastWallTime;
fLastWallTime = animTimer.msec();
if (fRunning) {
fCurrentTime += fLastWallTime - lastWallTime;
if (fCurrentTime > fTimeToShowNextFrame) {
fTimeToShowNextFrame += fImage->decodeNextFrame();
if (fImage->isFinished()) {
fRunning = false;
}
}
}
return true;
}
void onOnceBeforeDraw() override {
sk_sp<SkData> file(GetResourceAsData("images/alphabetAnim.gif"));
std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(file));
if (!codec) {
return;
}
fImage = SkAnimatedImage::Make(SkAndroidCodec::MakeFromCodec(std::move(codec)));
if (!fImage) {
return;
}
fTimeToShowNextFrame = fImage->currentFrameDuration();
SkPictureRecorder recorder;
auto canvas = recorder.beginRecording(fImage->getBounds());
canvas->drawDrawable(fImage.get());
fDrawable = recorder.finishRecordingAsDrawable();
}
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "AnimatedImage");
return true;
}
SkUnichar uni;
if (fImage && SampleCode::CharQ(*evt, &uni)) {
switch (uni) {
case kPauseKey:
fRunning = !fRunning;
if (fImage->isFinished()) {
// fall through
} else {
return true;
}
case kResetKey:
fImage->reset();
fCurrentTime = fLastWallTime;
fTimeToShowNextFrame = fCurrentTime + fImage->currentFrameDuration();
return true;
default:
break;
}
}
return this->INHERITED::onQuery(evt);
}
private:
sk_sp<SkAnimatedImage> fImage;
sk_sp<SkDrawable> fDrawable;
SkScalar fYOffset;
bool fRunning = false;
double fCurrentTime = 0.0;
double fLastWallTime = 0.0;
double fTimeToShowNextFrame = 0.0;
typedef SampleView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() {
return new SampleAnimatedImage;
}
static SkViewRegister reg(MyFactory);
|
