1/*
2 * Copyright 2015 Google Inc.
3 *
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 *
8 */
9
10#include "HelloWorld.h"
11
12#include "gl/GrGLInterface.h"
13#include "GrContext.h"
14#include "SkApplication.h"
15#include "SkCanvas.h"
16#include "SkGradientShader.h"
17#include "SkGraphics.h"
18#include "SkGr.h"
19
20void application_init() {
21    SkGraphics::Init();
22    SkEvent::Init();
23}
24
25void application_term() {
26    SkEvent::Term();
27}
28
29HelloWorldWindow::HelloWorldWindow(void* hwnd)
30    : INHERITED(hwnd) {
31    fType = kGPU_DeviceType;
32    fRenderTarget = NULL;
33    fRotationAngle = 0;
34    this->setTitle();
35    this->setUpBackend();
36}
37
38HelloWorldWindow::~HelloWorldWindow() {
39    tearDownBackend();
40}
41
42void HelloWorldWindow::tearDownBackend() {
43    SkSafeUnref(fContext);
44    fContext = NULL;
45
46    SkSafeUnref(fInterface);
47    fInterface = NULL;
48
49    SkSafeUnref(fRenderTarget);
50    fRenderTarget = NULL;
51
52    INHERITED::detach();
53}
54
55void HelloWorldWindow::setTitle() {
56    SkString title("Hello World ");
57    title.appendf(fType == kRaster_DeviceType ? "raster" : "opengl");
58    INHERITED::setTitle(title.c_str());
59}
60
61bool HelloWorldWindow::setUpBackend() {
62    this->setVisibleP(true);
63    this->setClipToBounds(false);
64
65    bool result = attach(kNativeGL_BackEndType, 0 /*msaa*/, &fAttachmentInfo);
66    if (false == result) {
67        SkDebugf("Not possible to create backend.\n");
68        detach();
69        return false;
70    }
71
72    fInterface = GrGLCreateNativeInterface();
73
74    SkASSERT(NULL != fInterface);
75
76    fContext = GrContext::Create(kOpenGL_GrBackend, (GrBackendContext)fInterface);
77    SkASSERT(NULL != fContext);
78
79    this->setUpRenderTarget();
80    return true;
81}
82
83void HelloWorldWindow::setUpRenderTarget() {
84    SkSafeUnref(fRenderTarget);
85    fRenderTarget = this->renderTarget(fAttachmentInfo, fInterface, fContext);
86}
87
88void HelloWorldWindow::drawContents(SkCanvas* canvas) {
89    // Clear background
90    canvas->drawColor(SK_ColorWHITE);
91
92    SkPaint paint;
93    paint.setColor(SK_ColorRED);
94
95    // Draw a rectangle with red paint
96    SkRect rect = {
97            10, 10,
98            128, 128
99    };
100    canvas->drawRect(rect, paint);
101
102    // Set up a linear gradient and draw a circle
103    {
104        SkPoint linearPoints[] = {
105                {0, 0},
106                {300, 300}
107        };
108        SkColor linearColors[] = {SK_ColorGREEN, SK_ColorBLACK};
109
110        SkShader* shader = SkGradientShader::CreateLinear(
111                linearPoints, linearColors, NULL, 2,
112                SkShader::kMirror_TileMode);
113        SkAutoUnref shader_deleter(shader);
114
115        paint.setShader(shader);
116        paint.setFlags(SkPaint::kAntiAlias_Flag);
117
118        canvas->drawCircle(200, 200, 64, paint);
119
120        // Detach shader
121        paint.setShader(NULL);
122    }
123
124    // Draw a message with a nice black paint.
125    paint.setFlags(
126            SkPaint::kAntiAlias_Flag |
127            SkPaint::kSubpixelText_Flag |  // ... avoid waggly text when rotating.
128            SkPaint::kUnderlineText_Flag);
129    paint.setColor(SK_ColorBLACK);
130    paint.setTextSize(20);
131
132    canvas->save();
133
134    static const char message[] = "Hello World";
135
136    // Translate and rotate
137    canvas->translate(300, 300);
138    fRotationAngle += 0.2f;
139    if (fRotationAngle > 360) {
140        fRotationAngle -= 360;
141    }
142    canvas->rotate(fRotationAngle);
143
144    // Draw the text:
145    canvas->drawText(message, strlen(message), 0, 0, paint);
146
147    canvas->restore();
148}
149
150void HelloWorldWindow::draw(SkCanvas* canvas) {
151    drawContents(canvas);
152    // in case we have queued drawing calls
153    fContext->flush();
154    // Invalidate the window to force a redraw. Poor man's animation mechanism.
155    this->inval(NULL);
156
157    if (kRaster_DeviceType == fType) {
158        // need to send the raster bits to the (gpu) window
159        SkImage* snap = fSurface->newImageSnapshot();
160        size_t rowBytes = 0;
161        SkImageInfo info;
162        const void* pixels = snap->peekPixels(&info, &rowBytes);
163        fRenderTarget->writePixels(0, 0, snap->width(), snap->height(),
164                                        SkImageInfo2GrPixelConfig(info.colorType(),
165                                                                info.alphaType(),
166                                                                info.profileType()),
167                                        pixels,
168                                        rowBytes,
169                                        GrContext::kFlushWrites_PixelOp);
170        SkSafeUnref(snap);
171    }
172    INHERITED::present();
173}
174
175void HelloWorldWindow::onSizeChange() {
176    setUpRenderTarget();
177}
178
179bool HelloWorldWindow::onHandleChar(SkUnichar unichar) {
180    if (' ' == unichar) {
181        fType = fType == kRaster_DeviceType ? kGPU_DeviceType: kRaster_DeviceType;
182        tearDownBackend();
183        setUpBackend();
184        this->setTitle();
185        this->inval(NULL);
186    }
187    return true;
188}
189
190SkOSWindow* create_sk_window(void* hwnd, int , char** ) {
191    return new HelloWorldWindow(hwnd);
192}
193