move to self repo
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commit
169b79d0cb
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package gofb
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/*
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <linux/fb.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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int OpenFrameBuffer(char * name) {
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return open(name, O_RDWR);
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}
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static int GetFixedScreenInformation(int fd,struct fb_fix_screeninfo *finfo)
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{
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return ioctl(fd, FBIOGET_FSCREENINFO, finfo);
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}
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static int GetVarScreenInformation(int fd,struct fb_var_screeninfo *vinfo) {
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return ioctl(fd, FBIOGET_VSCREENINFO, vinfo);
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}
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*/
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import "C"
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import (
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"errors"
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"fmt"
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"image"
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"os/exec"
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"unsafe"
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)
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type Framebuffer struct {
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Fd int
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BitsPerPixel int
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Xres int
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Yres int
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Data []byte
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Xoffset int
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Yoffset int
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LineLength int
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Screensize int
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}
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func NewFramebuffer() *Framebuffer {
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return &Framebuffer{}
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}
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func _HideCursor() {
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fmt.Print("\033[?25l")
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exec.Command(`kill `)
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}
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func _ShowCursor() {
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fmt.Printf("\033[?25h")
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}
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func (f *Framebuffer) Init() {
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_HideCursor()
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dev_file := C.CString("/dev/fb0")
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fd, err := C.OpenFrameBuffer(dev_file)
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C.free(unsafe.Pointer(dev_file))
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if err != nil {
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panic(errors.New("Open the framebuffer failed"))
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}
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var finfo C.struct_fb_fix_screeninfo
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if _, err := C.GetFixedScreenInformation(fd, &finfo); err != nil {
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fmt.Println(err)
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}
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var vinfo C.struct_fb_var_screeninfo
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if _, err := C.GetVarScreenInformation(fd, &vinfo); err != nil {
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fmt.Println(err)
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}
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f.Xres = int(vinfo.xres)
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f.Yres = int(vinfo.yres)
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f.BitsPerPixel = int(vinfo.bits_per_pixel)
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f.Xoffset = int(vinfo.xoffset)
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f.Yoffset = int(vinfo.yoffset)
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f.LineLength = int(finfo.line_length)
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f.Screensize = int(finfo.smem_len)
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addr := uintptr(C.mmap(nil, C.size_t(f.Screensize), C.PROT_READ|C.PROT_WRITE, C.MAP_SHARED, fd, 0))
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var sl = struct {
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addr uintptr
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len int
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cap int
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}{addr, f.Screensize, f.Screensize}
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f.Data = *(*[]byte)(unsafe.Pointer(&sl))
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}
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func (f *Framebuffer) Release() {
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C.munmap(unsafe.Pointer(&f.Data[0]), C.size_t(f.Screensize))
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C.close(C.int(f.Fd))
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_ShowCursor()
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}
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func (f *Framebuffer) SetPixel(x int, y int, r uint32, g uint32, b uint32, a uint32) {
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if x < 0 || x > f.Xres {
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panic(errors.New("X is too big or is negative"))
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}
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if y < 0 || y > f.Yres {
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panic(errors.New("Y is too big or is negative"))
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}
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location := (x+f.Xoffset)*(f.BitsPerPixel/8) + (y+f.Yoffset)*f.LineLength
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f.Data[location+3] = byte(a & 0xff)
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f.Data[location+2] = byte(r & 0xff)
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f.Data[location+1] = byte(g & 0xff)
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f.Data[location] = byte(b & 0xff)
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}
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func (f *Framebuffer) DrawImage(xoffset int, yoffset int, image image.Image) {
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b := image.Bounds()
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for y := 0; y < b.Max.Y; y++ {
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for x := 0; x < b.Max.X; x++ {
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r, g, b, a := image.At(x, y).RGBA()
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f.SetPixel(x+xoffset, y+yoffset, r&0xff, g&0xff, b&0xff, a&0xff)
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}
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}
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}
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func (f *Framebuffer) DrawData(xoffset int, yoffset int, data []byte, w int, h int) {
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if w > f.Xres {
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panic(errors.New("The width of data must NOT be bigger the Xres of the framebuffer"))
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}
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for y := 0; y < h; y++ {
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if (y+1)*w > len(data) {
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panic(errors.New("The length of image data is too small or w(h) argument is wrong"))
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}
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line_start := (xoffset+f.Xoffset)*(f.BitsPerPixel/8) + (y+yoffset+f.Yoffset)*f.LineLength
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line_end := (xoffset+f.Xoffset)*(f.BitsPerPixel/8) + (y+1+yoffset+f.Yoffset)*f.LineLength - 1
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if line_start+w > line_end {
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panic(errors.New("The lines is too long beyond the framebuffer"))
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}
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data_line := data[y*w*4 : (y+1)*w*4]
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copy(f.Data[line_start:line_start+w*4], data_line)
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}
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}
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func (f *Framebuffer) Fill(r, g, b, a uint32) {
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for y := 0; y < f.Yres; y++ {
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for x := 0; x < f.Xres; x++ {
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f.SetPixel(x, y, r, g, b, a)
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}
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}
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}
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@ -0,0 +1,132 @@
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package gofb
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import (
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"image"
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"testing"
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"github.com/ungerik/go-cairo"
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)
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func BenchmarkFill(b *testing.B) {
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fb := NewFramebuffer()
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fb.Init()
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defer fb.Release()
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for i := 0; i < b.N; i++ {
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fb.Fill(0, 0, 255, 0)
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}
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}
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func BenchmarkMakeSurfaceImage(b *testing.B) {
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surface := cairo.NewSurface(cairo.FORMAT_ARGB32, 1680, 1050)
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defer surface.Finish()
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for i := 0; i < b.N; i++ {
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surface.SetSourceRGBA(1, 1, 1, 1)
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surface.Rectangle(0, 0, 240, 80)
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surface.Fill()
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surface.SelectFontFace("serif", cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)
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surface.SetFontSize(32.0)
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surface.SetSourceRGBA(0, 0, 0, .1)
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surface.MoveTo(10.0, 50.0)
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surface.ShowText("Hello World")
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surface.GetImage()
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}
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}
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func BenchmarkDrawImage(b *testing.B) {
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fb := NewFramebuffer()
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fb.Init()
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defer fb.Release()
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image := image.NewRGBA(image.Rect(0, 0, fb.Xres, fb.Yres))
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for i := 0; i < b.N; i++ {
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fb.DrawImage(0, 0, image)
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}
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}
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func BenchmarkCairoGetData(b *testing.B) {
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fb := NewFramebuffer()
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fb.Init()
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defer fb.Release()
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surface := cairo.NewSurface(cairo.FORMAT_ARGB32, fb.Xres, fb.Yres)
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defer surface.Finish()
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for i := 0; i < b.N; i++ {
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surface.GetData()
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}
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}
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func BenchmarkDrawData(b *testing.B) {
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fb := NewFramebuffer()
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fb.Init()
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defer fb.Release()
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data := make([]byte, fb.Xres*fb.Yres*4, fb.Xres*fb.Yres*4)
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for i := 0; i < b.N; i++ {
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fb.DrawData(0, 0, data, fb.Xres, fb.Yres)
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}
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}
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func BenchmarkCopyDataByLine(b *testing.B) {
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fb := NewFramebuffer()
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fb.Init()
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defer fb.Release()
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data1 := make([]byte, fb.Xres*fb.Yres*4, fb.Xres*fb.Yres*4)
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data2 := make([]byte, fb.Xres*fb.Yres*4, fb.Xres*fb.Yres*4)
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for i := 0; i < b.N; i++ {
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for y := 0; y < fb.Yres; y++ {
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copy(data1[y*fb.Xres*4:(y+1)*fb.Xres*4], data2[y*fb.Xres*4:(y+1)*fb.Xres*4])
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}
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}
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}
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func BenchmarkCopyDataAllInOne(b *testing.B) {
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fb := NewFramebuffer()
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fb.Init()
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defer fb.Release()
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data1 := make([]byte, fb.Xres*fb.Yres*4, fb.Xres*fb.Yres*4)
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data2 := make([]byte, fb.Xres*fb.Yres*4, fb.Xres*fb.Yres*4)
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for i := 0; i < b.N; i++ {
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copy(data1, data2)
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}
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}
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func BenchmarkAnimation(b *testing.B) {
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fb := NewFramebuffer()
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fb.Init()
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defer fb.Release()
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surface := cairo.NewSurface(cairo.FORMAT_ARGB32, fb.Xres, fb.Yres)
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defer surface.Finish()
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for i := 0; i < b.N; i++ {
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surface.SetSourceRGBA(0, 0, 0, 1)
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surface.Rectangle(0, 0, float64(fb.Xres), float64(fb.Yres))
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surface.Fill()
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surface.SelectFontFace("serif", cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)
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surface.SetFontSize(32.0)
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surface.SetSourceRGBA(1, 1, 1, 1)
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surface.MoveTo(10.0+float64(i), 50.0)
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surface.ShowText("道可道 非常道")
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data := surface.GetData()
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fb.DrawData(0, 0, data, fb.Xres, fb.Yres)
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}
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}
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