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package main
import (
"image"
"image/draw"
"os"
"github.com/faiface/gui"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
_ "golang.org/x/image/bmp"
)
func Viewer(env gui.Env, theme *Theme, view <-chan string) {
redraw := func(r image.Rectangle, img image.Image) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
draw.Draw(drw, r, &image.Uniform{theme.Empty}, image.ZP, draw.Src)
DrawCentered(drw, r, img, draw.Over)
return r
}
}
invalid := DrawText("Invalid image", theme.Face, theme.Text)
var (
r image.Rectangle
img image.Image
)
for {
select {
case path := <-view:
func() {
f, err := os.Open(path)
if err != nil {
img = invalid
return
}
defer f.Close()
img, _, err = image.Decode(f)
if err != nil {
img = invalid
return
}
}()
env.Draw() <- redraw(r, img)
case e, ok := <-env.Events():
if !ok {
close(env.Draw())
return
}
var minX, minY, maxX, maxY int
switch {
case e.Matches("resize/%d/%d/%d/%d", &minX, &minY, &maxX, &maxY):
r = image.Rect(minX, minY, maxX, maxY)
env.Draw() <- redraw(r, img)
}
}
}
}
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