1 /*
2 * Copyright 2015 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/SkFont.h"
10 #include "include/core/SkRSXform.h"
11 #include "include/core/SkSurface.h"
12 #include "samplecode/Sample.h"
13 #include "tools/Resources.h"
14 #include "tools/timer/Timer.h"
15
16 #include <stdio.h>
17
18 static const int kGrid = 100;
19 static const int kWidth = 960;
20 static const int kHeight = 640;
21
22 typedef void (*DrawAtlasProc)(SkCanvas*, SkImage*, const SkRSXform[], const SkRect[],
23 const SkColor[], int, const SkRect*, const SkPaint*);
24
draw_atlas(SkCanvas * canvas,SkImage * atlas,const SkRSXform xform[],const SkRect tex[],const SkColor colors[],int count,const SkRect * cull,const SkPaint * paint)25 static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
26 const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
27 const SkPaint* paint) {
28 canvas->drawAtlas(atlas, xform, tex, colors, count, SkBlendMode::kModulate, cull, paint);
29 }
30
draw_atlas_sim(SkCanvas * canvas,SkImage * atlas,const SkRSXform xform[],const SkRect tex[],const SkColor colors[],int count,const SkRect * cull,const SkPaint * paint)31 static void draw_atlas_sim(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
32 const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
33 const SkPaint* paint) {
34 for (int i = 0; i < count; ++i) {
35 SkMatrix matrix;
36 matrix.setRSXform(xform[i]);
37
38 canvas->save();
39 canvas->concat(matrix);
40 canvas->drawImageRect(atlas, tex[i], tex[i].makeOffset(-tex[i].x(), -tex[i].y()), paint,
41 SkCanvas::kFast_SrcRectConstraint);
42 canvas->restore();
43 }
44 }
45
46
47 class DrawShipView : public Sample {
48 public:
DrawShipView(const char name[],DrawAtlasProc proc)49 DrawShipView(const char name[], DrawAtlasProc proc) : fName(name), fProc(proc) {
50 fAtlas = GetResourceAsImage("images/ship.png");
51 if (!fAtlas) {
52 SkDebugf("\nCould not decode file ship.png. Falling back to penguin mode.\n");
53 fAtlas = GetResourceAsImage("images/baby_tux.png");
54 if (!fAtlas) {
55 SkDebugf("\nCould not decode file baby_tux.png. Did you forget"
56 " to set the resourcePath?\n");
57 return;
58 }
59 }
60
61 SkScalar anchorX = fAtlas->width()*0.5f;
62 SkScalar anchorY = fAtlas->height()*0.5f;
63 int currIndex = 0;
64 for (int x = 0; x < kGrid; x++) {
65 for (int y = 0; y < kGrid; y++) {
66 float xPos = (x / (kGrid - 1.0f)) * kWidth;
67 float yPos = (y / (kGrid - 1.0f)) * kWidth;
68
69 fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
70 SkIntToScalar(fAtlas->width()),
71 SkIntToScalar(fAtlas->height()));
72 fXform[currIndex] = SkRSXform::MakeFromRadians(0.1f, SK_ScalarPI*0.5f,
73 xPos, yPos, anchorX, anchorY);
74 currIndex++;
75 }
76 }
77 fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
78 SkIntToScalar(fAtlas->width()),
79 SkIntToScalar(fAtlas->height()));
80 fXform[currIndex] = SkRSXform::MakeFromRadians(0.5f, SK_ScalarPI*0.5f,
81 kWidth*0.5f, kHeight*0.5f, anchorX, anchorY);
82
83 }
84
~DrawShipView()85 ~DrawShipView() override {}
86
87 protected:
name()88 SkString name() override { return SkString(fName); }
89
onDrawContent(SkCanvas * canvas)90 void onDrawContent(SkCanvas* canvas) override {
91 const float kCosDiff = 0.99984769515f;
92 const float kSinDiff = 0.01745240643f;
93
94 if (!fAtlas) {
95 return;
96 }
97
98 SkPaint paint;
99 paint.setFilterQuality(kLow_SkFilterQuality);
100 paint.setColor(SK_ColorWHITE);
101
102 SkScalar anchorX = fAtlas->width()*0.5f;
103 SkScalar anchorY = fAtlas->height()*0.5f;
104 for (int i = 0; i < kGrid*kGrid+1; ++i) {
105 SkScalar c = fXform[i].fSCos;
106 SkScalar s = fXform[i].fSSin;
107
108 SkScalar dx = c*anchorX - s*anchorY;
109 SkScalar dy = s*anchorX + c*anchorY;
110
111 fXform[i].fSCos = kCosDiff*c - kSinDiff*s;
112 fXform[i].fSSin = kSinDiff*c + kCosDiff*s;
113
114 dx -= fXform[i].fSCos*anchorX - fXform[i].fSSin*anchorY;
115 dy -= fXform[i].fSSin*anchorX + fXform[i].fSCos*anchorY;
116 fXform[i].fTx += dx;
117 fXform[i].fTy += dy;
118 }
119
120 fProc(canvas, fAtlas.get(), fXform, fTex, nullptr, kGrid*kGrid+1, nullptr, &paint);
121 }
122
onAnimate(double nanos)123 bool onAnimate(double nanos) override {
124 //TODO: use nanos
125 //SkScalar angle = SkDoubleToScalar(fmod(1e-9 * nanos * 360 / 24, 360));
126 //fAnimatingDrawable->setSweep(angle);
127 return true;
128 }
129
130 private:
131 const char* fName;
132 DrawAtlasProc fProc;
133
134 sk_sp<SkImage> fAtlas;
135 SkRSXform fXform[kGrid*kGrid+1];
136 SkRect fTex[kGrid*kGrid+1];
137
138 typedef Sample INHERITED;
139 };
140
141 //////////////////////////////////////////////////////////////////////////////
142
143 DEF_SAMPLE( return new DrawShipView("DrawShip", draw_atlas); )
144 DEF_SAMPLE( return new DrawShipView("DrawShipSim", draw_atlas_sim); )
145
