feat: Initial commit
This commit is contained in:
commit
e260768039
7 changed files with 254 additions and 0 deletions
5
README.md
Normal file
5
README.md
Normal file
|
@ -0,0 +1,5 @@
|
|||
# imagedrm
|
||||
|
||||
A simple library that wraps [godrm](https://github.com/kytart/godrm) as [draw.Image](https://pkg.go.dev/image/draw#Image)
|
||||
|
||||
See example usage in `examples/`.
|
145
drm.go
Normal file
145
drm.go
Normal file
|
@ -0,0 +1,145 @@
|
|||
package imagedrm
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/kytart/godrm/pkg/drm"
|
||||
"github.com/kytart/godrm/pkg/mode"
|
||||
"launchpad.net/gommap"
|
||||
"os"
|
||||
)
|
||||
|
||||
type Framebuffer struct {
|
||||
*mode.FB
|
||||
id uint32
|
||||
data []byte
|
||||
}
|
||||
|
||||
type Image struct {
|
||||
file *os.File
|
||||
modeset *mode.SimpleModeset
|
||||
displays []*Display
|
||||
}
|
||||
|
||||
type Display struct {
|
||||
mode *mode.Modeset
|
||||
fb *Framebuffer
|
||||
savedCrtc *mode.Crtc
|
||||
}
|
||||
|
||||
func NewImage() (*Image, error) {
|
||||
file, err := drm.OpenCard(0)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("open drm card: %w", err)
|
||||
}
|
||||
defer file.Close()
|
||||
|
||||
if !drm.HasDumbBuffer(file) {
|
||||
return nil, fmt.Errorf("drm device does not support dumb buffers")
|
||||
}
|
||||
|
||||
modeset, err := mode.NewSimpleModeset(file)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("create modeset: %w", err)
|
||||
}
|
||||
|
||||
image := &Image{
|
||||
file: file,
|
||||
modeset: modeset,
|
||||
}
|
||||
|
||||
for _, mod := range modeset.Modesets {
|
||||
display, err := image.setupDisplay(mod)
|
||||
if err != nil {
|
||||
image.Close()
|
||||
return nil, fmt.Errorf("setup display: %w", err)
|
||||
}
|
||||
|
||||
image.displays = append(image.displays, display)
|
||||
}
|
||||
|
||||
return image, nil
|
||||
}
|
||||
|
||||
func (i *Image) Close() error {
|
||||
var err error
|
||||
for _, display := range i.displays {
|
||||
err = i.destroyFramebuffer(display)
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
func (i *Image) createFramebuffer(dev *mode.Modeset) (*Framebuffer, error) {
|
||||
fb, err := mode.CreateFB(i.file, dev.Width, dev.Height, 32)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("create framebuffer: %w", err)
|
||||
}
|
||||
|
||||
fbID, err := mode.AddFB(i.file, dev.Width, dev.Height, 24, 32, fb.Pitch, fb.Handle)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("create dumb buffer: %w", err)
|
||||
}
|
||||
|
||||
offset, err := mode.MapDumb(i.file, fb.Handle)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("map dumb: %w", err)
|
||||
}
|
||||
|
||||
mmap, err := gommap.MapAt(0, i.file.Fd(), int64(offset), int64(fb.Size), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_SHARED)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("mmap framebuffer: %w", err)
|
||||
}
|
||||
|
||||
for i := uint64(0); i < fb.Size; i++ {
|
||||
mmap[i] = 0
|
||||
}
|
||||
|
||||
return &Framebuffer{
|
||||
FB: fb,
|
||||
id: fbID,
|
||||
data: mmap,
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (i *Image) destroyFramebuffer(display *Display) error {
|
||||
err := gommap.MMap(display.fb.data).UnsafeUnmap()
|
||||
if err != nil {
|
||||
return fmt.Errorf("munmap memory: %w", err)
|
||||
}
|
||||
|
||||
err = mode.RmFB(i.file, display.fb.id)
|
||||
if err != nil {
|
||||
return fmt.Errorf("remove frame buffer: %w", err)
|
||||
}
|
||||
|
||||
err = mode.DestroyDumb(i.file, display.fb.Handle)
|
||||
if err != nil {
|
||||
return fmt.Errorf("destroy dumb buffer: %w", err)
|
||||
}
|
||||
|
||||
return i.modeset.SetCrtc(display.mode, display.savedCrtc)
|
||||
}
|
||||
|
||||
func (i *Image) setupDisplay(mod mode.Modeset) (*Display, error) {
|
||||
framebuf, err := i.createFramebuffer(&mod)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("create framebuffer: %w", err)
|
||||
}
|
||||
|
||||
// save current CRTC of this display to restore at exit
|
||||
savedCrtc, err := mode.GetCrtc(i.file, mod.Crtc)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("get CRTC for connector %d: %w", mod.Conn, err)
|
||||
}
|
||||
|
||||
// change the display
|
||||
err = mode.SetCrtc(i.file, mod.Crtc, framebuf.id, 0, 0, &mod.Conn, 1, &mod.Mode)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("set CRTC for connector %d: %w", mod.Conn, err)
|
||||
}
|
||||
|
||||
return &Display{
|
||||
mode: &mod,
|
||||
fb: framebuf,
|
||||
savedCrtc: savedCrtc,
|
||||
}, nil
|
||||
}
|
BIN
examples/jpeg/glenda.jpg
Normal file
BIN
examples/jpeg/glenda.jpg
Normal file
Binary file not shown.
After Width: | Height: | Size: 5.2 KiB |
39
examples/jpeg/main.go
Normal file
39
examples/jpeg/main.go
Normal file
|
@ -0,0 +1,39 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"image"
|
||||
"image/color"
|
||||
"image/draw"
|
||||
"os"
|
||||
"time"
|
||||
|
||||
"github.com/ptrcnull/imagedrm"
|
||||
)
|
||||
|
||||
func main() {
|
||||
img, err := imagedrm.NewImage()
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer img.Close()
|
||||
|
||||
sourceFile, err := os.Open("glenda.jpg")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer sourceFile.Close()
|
||||
|
||||
source, _, err := image.Decode(sourceFile)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
draw.Draw(img, source.Bounds(), source, image.Point{}, draw.Src)
|
||||
|
||||
for {
|
||||
img.Set(100, 100, color.RGBA{R: 255, G: 255, B: 255})
|
||||
time.Sleep(time.Second * 1)
|
||||
img.Set(100, 100, color.RGBA{})
|
||||
time.Sleep(time.Second * 1)
|
||||
}
|
||||
}
|
8
go.mod
Normal file
8
go.mod
Normal file
|
@ -0,0 +1,8 @@
|
|||
module github.com/ptrcnull/imagedrm
|
||||
|
||||
go 1.17
|
||||
|
||||
require (
|
||||
github.com/kytart/godrm v0.0.0-20210309160922-6b139ef54591
|
||||
launchpad.net/gommap v0.0.0-20121012075617-000000000015
|
||||
)
|
6
go.sum
Normal file
6
go.sum
Normal file
|
@ -0,0 +1,6 @@
|
|||
github.com/kytart/godrm v0.0.0-20210309160922-6b139ef54591 h1:FeNG18vTIhxL15MKaAZytDbspAPlVteebfedo5gabT0=
|
||||
github.com/kytart/godrm v0.0.0-20210309160922-6b139ef54591/go.mod h1:Y+YdK8W4Pp8iogoLluZ0OenjBSNb9+8NqoNNEdYzxec=
|
||||
launchpad.net/gocheck v0.0.0-20140225173054-000000000087 h1:Izowp2XBH6Ya6rv+hqbceQyw/gSGoXfH/UPoTGduL54=
|
||||
launchpad.net/gocheck v0.0.0-20140225173054-000000000087/go.mod h1:hj7XX3B/0A+80Vse0e+BUHsHMTEhd0O4cpUHr/e/BUM=
|
||||
launchpad.net/gommap v0.0.0-20121012075617-000000000015 h1:ROjpWoAwfoub5UmgCuZwFvM/kWU+UFfuBXbJ6lz/awU=
|
||||
launchpad.net/gommap v0.0.0-20121012075617-000000000015/go.mod h1:+rB9VlRTGlxdpc/nkCoOe0Qxgn/pyVwo9lGtVndZbOo=
|
51
image.go
Normal file
51
image.go
Normal file
|
@ -0,0 +1,51 @@
|
|||
package imagedrm
|
||||
|
||||
import (
|
||||
"image"
|
||||
"image/color"
|
||||
"image/draw"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
func (i *Image) ColorModel() color.Model {
|
||||
return &image.Uniform{}
|
||||
}
|
||||
|
||||
func (i *Image) Bounds() image.Rectangle {
|
||||
display := i.displays[0]
|
||||
|
||||
mode := display.mode
|
||||
return image.Rectangle{
|
||||
Min: image.Point{},
|
||||
Max: image.Point{
|
||||
X: int(mode.Width),
|
||||
Y: int(mode.Height),
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func (i *Image) At(x, y int) color.Color {
|
||||
display := i.displays[0]
|
||||
|
||||
offset := (display.fb.Pitch * uint32(y)) + (uint32(x) * 4)
|
||||
val := *(*uint32)(unsafe.Pointer(&display.fb.data[offset]))
|
||||
|
||||
return color.RGBA{
|
||||
A: uint8((val & 0xff000000) >> 24),
|
||||
R: uint8((val & 0x00ff0000) >> 16),
|
||||
G: uint8((val & 0x0000ff00) >> 8),
|
||||
B: uint8(val & 0x000000ff),
|
||||
}
|
||||
}
|
||||
|
||||
func (i *Image) Set(x, y int, c color.Color) {
|
||||
display := i.displays[0]
|
||||
|
||||
r, g, b, a := c.RGBA()
|
||||
val := (a << 24) | (r << 16) | (g << 8) | b
|
||||
|
||||
offset := (display.fb.Pitch * uint32(y)) + (uint32(x) * 4)
|
||||
*(*uint32)(unsafe.Pointer(&display.fb.data[offset])) = val
|
||||
}
|
||||
|
||||
var _ draw.Image = (*Image)(nil)
|
Loading…
Reference in a new issue