157 lines
3.6 KiB
Go
157 lines
3.6 KiB
Go
package x
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// import "fmt"
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import "sync"
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import "image"
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import "golang.org/x/image/font"
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// import "github.com/jezek/xgb"
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import "github.com/jezek/xgbutil"
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import "github.com/jezek/xgbutil/ewmh"
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import "github.com/jezek/xgbutil/xwindow"
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import "github.com/jezek/xgbutil/xgraphics"
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import "git.tebibyte.media/sashakoshka/stone"
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type Backend struct {
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application *stone.Application
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config *stone.Config
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connection *xgbutil.XUtil
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window *xwindow.Window
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canvas *xgraphics.Image
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channel chan(stone.Event)
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drawLock sync.Mutex
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font struct {
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face font.Face
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}
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colors [4]xgraphics.BGRA
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metrics struct {
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windowWidth int
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windowHeight int
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cellWidth int
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cellHeight int
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padding int
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paddingX int
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paddingY int
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descent int
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}
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memory struct {
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windowWidth int
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windowHeight int
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}
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}
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func (backend *Backend) SetTitle (title string) (err error) {
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err = ewmh.WmNameSet(backend.connection, backend.window.Id, title)
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return
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}
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func (backend *Backend) SetIcon (icons []image.Image) (err error) {
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wmIcons := []ewmh.WmIcon { }
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for _, icon := range icons {
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width := icon.Bounds().Max.X
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height := icon.Bounds().Max.Y
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wmIcon := ewmh.WmIcon {
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Width: uint(width),
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Height: uint(height),
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Data: make ([]uint, width * height),
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}
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// manually convert image data beacuse of course we have to do
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// this
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index := 0
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for y := 0; y < height; y ++ {
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for x := 0; x < width; x ++ {
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r, g, b, a := icon.At(x, y).RGBA()
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r >>= 8
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g >>= 8
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b >>= 8
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a >>= 8
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wmIcon.Data[index] =
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(uint(a) << 24) |
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(uint(r) << 16) |
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(uint(g) << 8) |
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(uint(b) << 0)
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index ++
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}}
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wmIcons = append(wmIcons, wmIcon)
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}
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err = ewmh.WmIconSet(backend.connection, backend.window.Id, wmIcons)
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return
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}
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// calculateWindowSize calculates window bounds based on the internal buffer
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// size.
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func (backend *Backend) calculateWindowSize () (x, y int) {
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width, height := backend.application.Size()
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x =
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width * backend.metrics.cellWidth +
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backend.metrics.padding * 2
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y =
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height * backend.metrics.cellHeight +
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backend.metrics.padding * 2
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return
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}
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func (backend *Backend) calculateBufferSize () (width, height int) {
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width =
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(backend.metrics.windowWidth - backend.metrics.padding * 2) /
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backend.metrics.cellWidth
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height =
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(backend.metrics.windowHeight - backend.metrics.padding * 2) /
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backend.metrics.cellHeight
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return
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}
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func (backend *Backend) reallocateCanvas () {
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if backend.canvas != nil {
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backend.canvas.Destroy()
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}
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backend.canvas = xgraphics.New (
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backend.connection,
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image.Rect (
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0, 0,
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backend.metrics.windowWidth,
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backend.metrics.windowHeight))
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backend.canvas.For (func (x, y int) xgraphics.BGRA {
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return backend.colors[stone.ColorApplication]
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})
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backend.canvas.XSurfaceSet(backend.window.Id)
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}
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func (backend *Backend) cellAt (onScreen image.Point) (x, y int) {
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x = (onScreen.X - backend.metrics.paddingX) / backend.metrics.cellWidth
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y = (onScreen.Y - backend.metrics.paddingY) / backend.metrics.cellHeight
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return
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}
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func (backend *Backend) cellSubImage (x, y int) (cell *xgraphics.Image) {
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cell = backend.canvas.SubImage(backend.boundsOfCell(x, y)).(*xgraphics.Image)
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return
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}
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func (backend *Backend) originOfCell (x, y int) (origin image.Point) {
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origin = image.Point {
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X: x * backend.metrics.cellWidth + backend.metrics.paddingX,
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Y: y * backend.metrics.cellHeight + backend.metrics.paddingY,
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}
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return
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}
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func (backend *Backend) boundsOfCell (x, y int) (bounds image.Rectangle) {
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bounds = image.Rectangle {
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Min: backend.originOfCell(x, y),
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Max: backend.originOfCell(x + 1, y + 1),
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}
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return
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}
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