1 /*
2 * Copyright 2018 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 "include/core/SkCanvas.h"
9 #include "include/core/SkData.h"
10 #include "include/core/SkImage.h"
11 #include "modules/skresources/include/SkResources.h"
12 #include "tools/Resources.h"
13 #include "tools/viewer/AnimatedImageSlide.h"
14 #include <cmath>
15
AnimatedImageSlide(const SkString & name,const SkString & path)16 AnimatedImageSlide::AnimatedImageSlide(const SkString& name, const SkString& path)
17 : fPath(path)
18 {
19 fName = name;
20 }
21
load(SkScalar w,SkScalar h)22 void AnimatedImageSlide::load(SkScalar w, SkScalar h) {
23 fWinSize = {w, h};
24
25 // Try loading both as a resource and as a regular file.
26 sk_sp<SkData> data = GetResourceAsData(fPath.c_str());
27 if (!data) {
28 data = SkData::MakeFromFileName(fPath.c_str());
29 }
30
31 fImageAsset = skresources::MultiFrameImageAsset::Make(std::move(data));
32 }
33
unload()34 void AnimatedImageSlide::unload() {
35 fImageAsset.reset();
36 fTimeBase = 0;
37 }
38
draw(SkCanvas * canvas)39 void AnimatedImageSlide::draw(SkCanvas* canvas) {
40 if (!fImageAsset) {
41 return;
42 }
43
44 sk_sp<SkImage> frame = fImageAsset->getFrame(fFrameMs * 0.001f);
45
46 SkAutoCanvasRestore acr(canvas, true);
47 canvas->translate((fWinSize.width() - frame->width()) / 2,
48 (fWinSize.height() - frame->height()) / 2);
49
50 SkPaint outline_paint;
51 outline_paint.setAntiAlias(true);
52 outline_paint.setColor(0x80000000);
53 outline_paint.setStyle(SkPaint::kStroke_Style);
54
55 const SkRect outline = SkRect::Make(frame->bounds()).makeOutset(1, 1);
56 canvas->drawRect(outline, outline_paint);
57
58 canvas->drawImage(frame, 0, 0);
59 }
60
animate(double nanos)61 bool AnimatedImageSlide::animate(double nanos) {
62 if (!fImageAsset || !fImageAsset->isMultiFrame()) {
63 return false;
64 }
65
66 if (!fTimeBase) {
67 fTimeBase = nanos;
68 }
69
70 fFrameMs = std::fmod((nanos - fTimeBase) * 0.000001f, fImageAsset->duration());
71
72 return true;
73 }
74
75 DEF_SLIDE( return new AnimatedImageSlide(SkString("AnimatedImage"),
76 SkString("images/alphabetAnim.gif")); )
77
