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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdlib.h>
#include <stdio.h>
#include "GLFW/glfw3.h"
#include "GrBackendSurface.h"
#include "GrContext.h"
#include "SkCanvas.h"
#include "SkImage.h"
#include "SkRSXform.h"
#include "SkSurface.h"
#include "Timer.h"
GrContext* sContext = nullptr;
SkSurface* sSurface = nullptr;
static void error_callback(int error, const char* description) {
fputs(description, stderr);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
}
static void init_skia(int w, int h) {
sContext = GrContext::MakeGL(nullptr).release();
GrGLFramebufferInfo framebufferInfo;
framebufferInfo.fFBOID = 0; // assume default framebuffer
// We are always using OpenGL and we use RGBA8 internal format for both RGBA and BGRA configs in
// OpenGL.
framebufferInfo.fFormat = GR_GL_RGBA8;
SkColorType colorType;
if (kRGBA_8888_GrPixelConfig == kSkia8888_GrPixelConfig) {
colorType = kRGBA_8888_SkColorType;
} else {
colorType = kBGRA_8888_SkColorType;
}
GrBackendRenderTarget backendRenderTarget(w, h,
0, // sample count
0, // stencil bits
framebufferInfo);
sSurface = SkSurface::MakeFromBackendRenderTarget(sContext, backendRenderTarget,
kBottomLeft_GrSurfaceOrigin, colortype,
nullptr, nullptr).release();
}
static void cleanup_skia() {
delete sSurface;
delete sContext;
}
const int kGrid = 100;
const int kWidth = 960;
const int kHeight = 640;
int main(void) {
GLFWwindow* window;
glfwSetErrorCallback(error_callback);
if (!glfwInit()) {
exit(EXIT_FAILURE);
}
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_SRGB_CAPABLE, GL_TRUE);
window = glfwCreateWindow(kWidth, kHeight, "Simple example", NULL, NULL);
if (!window) {
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
init_skia(kWidth, kHeight);
sk_sp<SkImage> atlas;
SkRSXform xform[kGrid*kGrid+1];
SkRect tex[kGrid*kGrid+1];
WallTimer timer;
float times[32];
int currentTime;
sk_sp<SkData> imageData(SkData::MakeFromFileName("images/ship.png"));
atlas.reset(SkImage::NewFromEncoded(imageData.get()));
if (!atlas) {
SkDebugf("\nCould not decode file ship.png\n");
cleanup_skia();
glfwDestroyWindow(window);
glfwTerminate();
exit(EXIT_FAILURE);
}
SkScalar anchorX = atlas->width()*0.5f;
SkScalar anchorY = atlas->height()*0.5f;
int currIndex = 0;
for (int x = 0; x < kGrid; x++) {
for (int y = 0; y < kGrid; y++) {
float xPos = (x / (kGrid - 1.0)) * kWidth;
float yPos = (y / (kGrid - 1.0)) * kWidth;
tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height());
xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f,
xPos, yPos, anchorX, anchorY);
currIndex++;
}
}
tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height());
xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f,
kWidth*0.5f, kHeight*0.5f, anchorX, anchorY);
currentTime = 0;
glfwSwapInterval(1);
glfwSetKeyCallback(window, key_callback);
// Draw to the surface via its SkCanvas.
SkCanvas* canvas = sSurface->getCanvas(); // We don't manage this pointer's lifetime.
SkPaint paint;
paint.setFilterQuality(kLow_SkFilterQuality);
paint.setColor(SK_ColorWHITE);
paint.setTextSize(15.0f);
while (!glfwWindowShouldClose(window)) {
const float kCosDiff = 0.99984769515f;
const float kSinDiff = 0.01745240643f;
timer.start();
glfwPollEvents();
float meanTime = 0.0f;
for (int i = 0; i < 32; ++i) {
meanTime += times[i];
}
meanTime /= 32.f;
char outString[64];
float fps = 1000.f/meanTime;
sprintf(outString, "fps: %f ms: %f", fps, meanTime);
for (int i = 0; i < kGrid*kGrid+1; ++i) {
SkScalar c = xform[i].fSCos;
SkScalar s = xform[i].fSSin;
SkScalar dx = c*anchorX - s*anchorY;
SkScalar dy = s*anchorX + c*anchorY;
xform[i].fSCos = kCosDiff*c - kSinDiff*s;
xform[i].fSSin = kSinDiff*c + kCosDiff*s;
dx -= xform[i].fSCos*anchorX - xform[i].fSSin*anchorY;
dy -= xform[i].fSSin*anchorX + xform[i].fSCos*anchorY;
xform[i].fTx += dx;
xform[i].fTy += dy;
}
canvas->clear(SK_ColorBLACK);
canvas->drawAtlas(atlas, xform, tex, nullptr, kGrid*kGrid+1, SkXfermode::kSrcOver_Mode,
nullptr, &paint);
canvas->drawText(outString, strlen(outString), 100.f, 100.f, paint);
canvas->flush();
timer.end();
times[currentTime] = (float)(timer.fWall);
currentTime = (currentTime + 1) & 0x1f;
glfwSwapBuffers(window);
}
cleanup_skia();
glfwDestroyWindow(window);
glfwTerminate();
exit(EXIT_SUCCESS);
}
|
