haven/prototypes/xgb-image.go

361 lines
8.8 KiB
Go

package main
import (
"encoding/binary"
"log"
"os"
"reflect"
"time"
"unsafe"
"github.com/BurntSushi/xgb"
"github.com/BurntSushi/xgb/render"
"github.com/BurntSushi/xgb/shm"
"github.com/BurntSushi/xgb/xproto"
"image"
"image/color"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
)
// #include <sys/ipc.h>
// #include <sys/shm.h>
import "C"
func F64ToFixed(f float64) render.Fixed { return render.Fixed(f * 65536) }
func FixedToF64(f render.Fixed) float64 { return float64(f) / 65536 }
var formats = map[byte]struct {
format render.Directformat
transform func(color.Color) uint32
}{
32: {
format: render.Directformat{
RedShift: 16,
RedMask: 0xff,
GreenShift: 8,
GreenMask: 0xff,
BlueShift: 0,
BlueMask: 0xff,
AlphaShift: 24,
AlphaMask: 0xff,
},
transform: func(color color.Color) uint32 {
r, g, b, a := color.RGBA()
return (a>>8)<<24 | (r>>8)<<16 | (g>>8)<<8 | (b >> 8)
},
},
30: {
/*
// Alpha makes compositing unbearably slow.
AlphaShift: 30,
AlphaMask: 0x3,
*/
format: render.Directformat{
RedShift: 20,
RedMask: 0x3ff,
GreenShift: 10,
GreenMask: 0x3ff,
BlueShift: 0,
BlueMask: 0x3ff,
},
transform: func(color color.Color) uint32 {
r, g, b, a := color.RGBA()
return (a>>14)<<30 | (r>>6)<<20 | (g>>6)<<10 | (b >> 6)
},
},
}
func main() {
/*
pf, err := os.Create("pprof.out")
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(pf)
defer pprof.StopCPUProfile()
*/
// Load a picture from the command line.
f, err := os.Open(os.Args[1])
if err != nil {
log.Fatalln(err)
}
defer f.Close()
img, name, err := image.Decode(f)
if err != nil {
log.Fatalln(err)
}
log.Println("image type is", name)
// Miscellaneous X11 initialization.
X, err := xgb.NewConn()
if err != nil {
log.Fatalln(err)
}
if err := render.Init(X); err != nil {
log.Fatalln(err)
}
setup := xproto.Setup(X)
screen := setup.DefaultScreen(X)
visual, depth := screen.RootVisual, screen.RootDepth
// Only go for 10-bit when the picture can make use of that range.
prefer30 := false
switch img.(type) {
case *image.Gray16, *image.RGBA64, *image.NRGBA64:
prefer30 = true
}
// XXX: We don't /need/ alpha here, it's just a minor improvement--affects
// the backpixel value. (And we reject it in 30-bit depth anyway.)
for _, i := range screen.AllowedDepths {
for _, v := range i.Visuals {
// TODO: Could/should check other parameters, e.g., the RGB masks.
if v.Class != xproto.VisualClassTrueColor {
continue
}
if i.Depth == 32 || i.Depth == 30 && prefer30 {
visual, depth = v.VisualId, i.Depth
if !prefer30 || i.Depth == 30 {
break
}
}
}
}
format, ok := formats[depth]
if !ok {
log.Fatalln("unsupported bit depth")
}
mid, err := xproto.NewColormapId(X)
if err != nil {
log.Fatalln(err)
}
_ = xproto.CreateColormap(
X, xproto.ColormapAllocNone, mid, screen.Root, visual)
wid, err := xproto.NewWindowId(X)
if err != nil {
log.Fatalln(err)
}
// Border pixel and colormap are required when depth differs from parent.
_ = xproto.CreateWindow(X, depth, wid, screen.Root,
0, 0, 500, 500, 0, xproto.WindowClassInputOutput,
visual, xproto.CwBackPixel|xproto.CwBorderPixel|xproto.CwEventMask|
xproto.CwColormap, []uint32{format.transform(color.Alpha{0x80}), 0,
xproto.EventMaskStructureNotify | xproto.EventMaskExposure,
uint32(mid)})
title := []byte("Image")
_ = xproto.ChangeProperty(X, xproto.PropModeReplace, wid, xproto.AtomWmName,
xproto.AtomString, 8, uint32(len(title)), title)
_ = xproto.MapWindow(X, wid)
pformats, err := render.QueryPictFormats(X).Reply()
if err != nil {
log.Fatalln(err)
}
// Similar to XRenderFindVisualFormat.
// The DefaultScreen is almost certain to be zero.
var pformat render.Pictformat
for _, pd := range pformats.Screens[X.DefaultScreen].Depths {
// This check seems to be slightly extraneous.
if pd.Depth != depth {
continue
}
for _, pv := range pd.Visuals {
if pv.Visual == visual {
pformat = pv.Format
}
}
}
// Wrap the window's surface in a picture.
pid, err := render.NewPictureId(X)
if err != nil {
log.Fatalln(err)
}
render.CreatePicture(X, pid, xproto.Drawable(wid), pformat, 0, []uint32{})
// setup.BitmapFormatScanline{Pad,Unit} and setup.BitmapFormatBitOrder
// don't interest us here since we're only using Z format pixmaps.
for _, pf := range setup.PixmapFormats {
if pf.Depth == depth {
if pf.BitsPerPixel != 32 || pf.ScanlinePad != 32 {
log.Fatalln("unsuported X server")
}
}
}
pixid, err := xproto.NewPixmapId(X)
if err != nil {
log.Fatalln(err)
}
_ = xproto.CreatePixmap(X, depth, pixid, xproto.Drawable(screen.Root),
uint16(img.Bounds().Dx()), uint16(img.Bounds().Dy()))
var bgraFormat render.Pictformat
for _, pf := range pformats.Formats {
if pf.Depth == depth && pf.Direct == format.format {
bgraFormat = pf.Id
break
}
}
if bgraFormat == 0 {
log.Fatalln("picture format not found")
}
// We could also look for the inverse pictformat.
var encoding binary.ByteOrder
if setup.ImageByteOrder == xproto.ImageOrderMSBFirst {
encoding = binary.BigEndian
} else {
encoding = binary.LittleEndian
}
pixpicid, err := render.NewPictureId(X)
if err != nil {
log.Fatalln(err)
}
render.CreatePicture(X, pixpicid, xproto.Drawable(pixid), bgraFormat,
0, []uint32{})
// Do we really need this? :/
cid, err := xproto.NewGcontextId(X)
if err != nil {
log.Fatalln(err)
}
_ = xproto.CreateGC(X, cid, xproto.Drawable(pixid),
xproto.GcGraphicsExposures, []uint32{0})
bounds := img.Bounds()
Lstart := time.Now()
if err := shm.Init(X); err != nil {
log.Println("MIT-SHM unavailable")
// We're being lazy and resolve the 1<<16 limit of requests by sending
// a row at a time. The encoding is also done inefficiently.
// Also see xgbutil/xgraphics/xsurface.go.
row := make([]byte, bounds.Dx()*4)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
encoding.PutUint32(row[x*4:], format.transform(img.At(x, y)))
}
_ = xproto.PutImage(X, xproto.ImageFormatZPixmap,
xproto.Drawable(pixid), cid, uint16(bounds.Dx()), 1,
0, int16(y),
0, depth, row)
}
} else {
rep, err := shm.QueryVersion(X).Reply()
if err != nil {
log.Fatalln(err)
}
if rep.PixmapFormat != xproto.ImageFormatZPixmap ||
!rep.SharedPixmaps {
log.Fatalln("MIT-SHM configuration unfit")
}
shmSize := bounds.Dx() * bounds.Dy() * 4
// As a side note, to clean up unreferenced segments (orphans):
// ipcs -m | awk '$6 == "0" { print $2 }' | xargs ipcrm shm
shmID := int(C.shmget(C.IPC_PRIVATE,
C.size_t(shmSize), C.IPC_CREAT|0777))
if shmID == -1 {
// TODO: We should handle this case by falling back to PutImage,
// if only because the allocation may hit a system limit.
log.Fatalln("memory allocation failed")
}
dataRaw := C.shmat(C.int(shmID), nil, 0)
defer C.shmdt(dataRaw)
defer C.shmctl(C.int(shmID), C.IPC_RMID, nil)
data := *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{
Data: uintptr(dataRaw), Len: shmSize, Cap: shmSize}))
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
row := data[y*bounds.Dx()*4:]
for x := bounds.Min.X; x < bounds.Max.X; x++ {
encoding.PutUint32(row[x*4:], format.transform(img.At(x, y)))
}
}
segid, err := shm.NewSegId(X)
if err != nil {
log.Fatalln(err)
}
// Need to have it attached on the server before we unload the segment.
c := shm.AttachChecked(X, segid, uint32(shmID), true /* RO */)
if err := c.Check(); err != nil {
log.Fatalln(err)
}
_ = shm.PutImage(X, xproto.Drawable(pixid), cid,
uint16(bounds.Dx()), uint16(bounds.Dy()), 0, 0,
uint16(bounds.Dx()), uint16(bounds.Dy()), 0, 0,
depth, xproto.ImageFormatZPixmap,
0 /* SendEvent */, segid, 0 /* Offset */)
}
log.Println("uploading took", time.Now().Sub(Lstart))
var scale float64 = 1
for {
ev, xerr := X.WaitForEvent()
if xerr != nil {
log.Printf("Error: %s\n", xerr)
return
}
if ev == nil {
return
}
log.Printf("Event: %s\n", ev)
switch e := ev.(type) {
case xproto.UnmapNotifyEvent:
return
case xproto.ConfigureNotifyEvent:
w, h := e.Width, e.Height
scaleX := float64(bounds.Dx()) / float64(w)
scaleY := float64(bounds.Dy()) / float64(h)
if scaleX < scaleY {
scale = scaleY
} else {
scale = scaleX
}
_ = render.SetPictureTransform(X, pixpicid, render.Transform{
F64ToFixed(scale), F64ToFixed(0), F64ToFixed(0),
F64ToFixed(0), F64ToFixed(scale), F64ToFixed(0),
F64ToFixed(0), F64ToFixed(0), F64ToFixed(1),
})
_ = render.SetPictureFilter(X, pixpicid, 8, "bilinear", nil)
case xproto.ExposeEvent:
_ = render.Composite(X, render.PictOpSrc,
pixpicid, render.PictureNone, pid,
0, 0, 0, 0, 0 /* dst-x */, 0, /* dst-y */
uint16(float64(img.Bounds().Dx())/scale),
uint16(float64(img.Bounds().Dy())/scale))
}
}
}