Golang C.TTF_Init函數代碼示例

func Init() error {
	ret := C.TTF_Init()
	if ret == 0 {
		return nil
	}
	return sdl.GetError()
}

//Opens a window.
//Returns an indicator of success.
func OpenDisplay(width, height int, fullscreen bool) bool {
	if C.SDL_Init(C.SDL_INIT_VIDEO) != 0 {
		return false
	}
	C.TTF_Init()
	var flags C.Uint32 = C.SDL_DOUBLEBUF
	flags |= C.SDL_SWSURFACE
	flags |= C.SDL_HWACCEL

	if fullscreen {
		screen = C.openDisplayFullscreen(C.int(width), C.int(height))
	} else {
		screen = C.openDisplay(C.int(width), C.int(height))
	}
	if screen == nil {
		return false
	}
	C.SDL_WM_SetCaption(C.CString(displayTitle), C.CString(""))
	C.SDL_GL_SetAttribute(C.SDL_GL_SWAP_CONTROL, 1)

	return true
}

// Init (https://www.libsdl.org/projects/SDL_ttf/docs/SDL_ttf_8.html#SEC8)
func Init() error {
	if C.TTF_Init() == -1 {
		return GetError()
	}
	return nil
}

func InitTTF() int {
	return int(C.TTF_Init())
}

// Initializes SDL_ttf.
func Init() int {
	sdl.GlobalMutex.Lock()
	status := int(C.TTF_Init())
	sdl.GlobalMutex.Unlock()
	return status
}

func main() {
	runtime.GOMAXPROCS(32)

	// sdl
	C.SDL_Init(C.SDL_INIT_AUDIO | C.SDL_INIT_VIDEO | C.SDL_INIT_TIMER)
	defer C.SDL_Quit()
	runtime.LockOSThread()
	window := C.SDL_CreateWindow(C.CString("play"), 0, 0, 1680, 1050,
		C.SDL_WINDOW_BORDERLESS|C.SDL_WINDOW_RESIZABLE|C.SDL_WINDOW_MAXIMIZED|C.SDL_WINDOW_OPENGL)
	if window == nil {
		fatalSDLError()
	}
	defer C.SDL_DestroyWindow(window)
	C.SDL_DisableScreenSaver()
	renderer := C.SDL_CreateRenderer(window, -1, C.SDL_RENDERER_ACCELERATED)
	if renderer == nil {
		fatalSDLError()
	}
	defer C.SDL_DestroyRenderer(renderer)
	var width, height C.int
	C.SDL_GetWindowSize(window, &width, &height)
	texture := C.SDL_CreateTexture(renderer,
		C.SDL_PIXELFORMAT_YV12,
		C.SDL_TEXTUREACCESS_STREAMING,
		width, height)
	if texture == nil {
		fatalSDLError()
	}
	defer C.SDL_DestroyTexture(texture)

	// sdl ttf
	if C.TTF_Init() == C.int(-1) {
		log.Fatal("sdl ttf init failed")
	}
	defer C.TTF_Quit()
	font := C.TTF_OpenFont(C.CString("/home/reus/font.ttf"), 32)
	if font == nil {
		fatalTTFError()
	}
	defer C.TTF_CloseFont(font)

	// open decoder
	decoder, err := NewDecoder(os.Args[1])
	if err != nil {
		log.Fatal(err)
	}
	if len(decoder.AudioStreams) == 0 || len(decoder.VideoStreams) == 0 {
		log.Fatal("no video or audio")
	}
	defer decoder.Close()

	// audio
	aCodecCtx := decoder.AudioStreams[0].codec
	audioStream := setupAudioOutput(int(aCodecCtx.sample_rate), int(aCodecCtx.channels), decoder)

	// call closure in sdl thread
	callEventCode := C.SDL_RegisterEvents(1)
	callbacks := make(chan func(Env), 1024)
	call := func(f func(env Env)) {
		var event C.SDL_Event
		var userevent C.SDL_UserEvent
		userevent._type = C.SDL_USEREVENT
		userevent.code = C.Sint32(callEventCode)
		C.set_userevent(&event, userevent)
		callbacks <- f
		C.SDL_PushEvent(&event)
	}

	// show fps
	nFrames := 0
	var fpsTexture *C.SDL_Texture
	var fpsColor C.SDL_Color
	var fpsSrc, fpsDst C.SDL_Rect
	fpsColor.r = 255
	fpsColor.g = 255
	fpsColor.b = 255
	fpsColor.a = 0
	go func() {
		for _ = range time.NewTicker(time.Second * 1).C {
			call(func(env Env) {
				cText := C.CString(fmt.Sprintf("%d", nFrames))
				sur := C.TTF_RenderUTF8_Blended(font, cText, fpsColor)
				fpsSrc.w = sur.w
				fpsSrc.h = sur.h
				fpsDst.w = sur.w
				fpsDst.h = sur.h
				C.SDL_DestroyTexture(fpsTexture)
				fpsTexture = C.SDL_CreateTextureFromSurface(env.renderer, sur)
				C.SDL_FreeSurface(sur)
				C.free(unsafe.Pointer(cText))
				nFrames = 0
			})
		}
	}()

	// render
	go func() {
		for {
			frame := <-decoder.timedFrames
			nFrames++
//.........這裏部分代碼省略.........

// Initialize the TTF engine - returns 0 if successful, -1 on error
func TTFInit() int {
	return int(C.TTF_Init())
}

// Initializes SDL_ttf.
func Init() error {
	sdl.GlobalMutex.Lock()
	status := int(C.TTF_Init())
	sdl.GlobalMutex.Unlock()
	return err(status)
}

func Init() error {
	if C.TTF_Init() != 0 {
		return getError()
	}
	return nil
}

// Initializes SDL_ttf.
func Init() int {
	status := int(C.TTF_Init())
	return status
}