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
|
/*
* 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 "HelloWorld.h"
#include "gl/GrGLInterface.h"
#include "GrContext.h"
#include "SkApplication.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkGr.h"
void application_init() {
SkGraphics::Init();
SkEvent::Init();
}
void application_term() {
SkEvent::Term();
}
HelloWorldWindow::HelloWorldWindow(void* hwnd)
: INHERITED(hwnd) {
fType = kGPU_DeviceType;
fRotationAngle = 0;
this->setTitle();
this->setUpBackend();
}
HelloWorldWindow::~HelloWorldWindow() {
tearDownBackend();
}
void HelloWorldWindow::tearDownBackend() {
SkSafeUnref(fContext);
fContext = NULL;
SkSafeUnref(fInterface);
fInterface = NULL;
fGpuSurface = nullptr;
INHERITED::release();
}
void HelloWorldWindow::setTitle() {
SkString title("Hello World ");
title.appendf(fType == kRaster_DeviceType ? "raster" : "opengl");
INHERITED::setTitle(title.c_str());
}
bool HelloWorldWindow::setUpBackend() {
this->setVisibleP(true);
this->setClipToBounds(false);
bool result = attach(kNativeGL_BackEndType, 0 /*msaa*/, false, &fAttachmentInfo);
if (false == result) {
SkDebugf("Not possible to create backend.\n");
release();
return false;
}
fInterface = GrGLCreateNativeInterface();
SkASSERT(NULL != fInterface);
fContext = GrContext::Create(kOpenGL_GrBackend, (GrBackendContext)fInterface);
SkASSERT(NULL != fContext);
this->setUpGpuBackedSurface();
return true;
}
void HelloWorldWindow::setUpGpuBackedSurface() {
fGpuSurface = this->makeGpuBackedSurface(fAttachmentInfo, fInterface, fContext);
}
void HelloWorldWindow::drawContents(SkCanvas* canvas) {
// Clear background
canvas->drawColor(SK_ColorWHITE);
SkPaint paint;
paint.setColor(SK_ColorRED);
// Draw a rectangle with red paint
SkRect rect = SkRect::MakeXYWH(10, 10, 128, 128);
canvas->drawRect(rect, paint);
// Set up a linear gradient and draw a circle
{
SkPoint linearPoints[] = {
{0, 0},
{300, 300}
};
SkColor linearColors[] = {SK_ColorGREEN, SK_ColorBLACK};
paint.setShader(SkGradientShader::MakeLinear(
linearPoints, linearColors, nullptr, 2,
SkShader::kMirror_TileMode));
paint.setFlags(SkPaint::kAntiAlias_Flag);
canvas->drawCircle(200, 200, 64, paint);
// Detach shader
paint.setShader(nullptr);
}
// Draw a message with a nice black paint.
paint.setFlags(
SkPaint::kAntiAlias_Flag |
SkPaint::kSubpixelText_Flag | // ... avoid waggly text when rotating.
SkPaint::kUnderlineText_Flag);
paint.setColor(SK_ColorBLACK);
paint.setTextSize(20);
canvas->save();
static const char message[] = "Hello World";
// Translate and rotate
canvas->translate(300, 300);
fRotationAngle += 0.2f;
if (fRotationAngle > 360) {
fRotationAngle -= 360;
}
canvas->rotate(fRotationAngle);
// Draw the text:
canvas->drawText(message, strlen(message), 0, 0, paint);
canvas->restore();
}
void HelloWorldWindow::draw(SkCanvas* canvas) {
this->drawContents(canvas);
// in case we have queued drawing calls
fContext->flush();
// Invalidate the window to force a redraw. Poor man's animation mechanism.
this->inval(NULL);
if (kRaster_DeviceType == fType) {
// need to send the raster bits to the (gpu) window
sk_sp<SkImage> snap = fRasterSurface->makeImageSnapshot();
SkPixmap pmap;
if (snap->peekPixels(&pmap)) {
const SkImageInfo& info = pmap.info();
SkCanvas* canvas = fGpuSurface->getCanvas();
canvas->writePixels(info, pmap.addr(), pmap.rowBytes(), 0, 0);
canvas->flush();
}
}
INHERITED::present();
}
void HelloWorldWindow::onSizeChange() {
this->setUpGpuBackedSurface();
}
bool HelloWorldWindow::onHandleChar(SkUnichar unichar) {
if (' ' == unichar) {
fType = fType == kRaster_DeviceType ? kGPU_DeviceType: kRaster_DeviceType;
tearDownBackend();
setUpBackend();
this->setTitle();
this->inval(NULL);
}
return true;
}
SkOSWindow* create_sk_window(void* hwnd, int , char** ) {
return new HelloWorldWindow(hwnd);
}
|
