72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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"image"
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"image/color"
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"image/png"
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"io/ioutil"
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"os"
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)
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const (
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bytesPerPixel = 2
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width = 480
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height = 320
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toolbarHeight = 16
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actualHeight = height - toolbarHeight
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total = width * actualHeight * bytesPerPixel
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)
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func main() {
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if len(os.Args) == 1 {
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fmt.Printf("Usage: %s INPUT ...\n", os.Args[0])
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fmt.Printf("Example: %s tmemo000.tmd tmemo001.tmd\n", os.Args[0])
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os.Exit(0)
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}
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for _, a := range os.Args[1:] {
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err := convert(a)
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if err != nil {
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fmt.Fprintf(os.Stderr, "failed to convert %s: %s\n", a, err)
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os.Exit(1)
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}
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}
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}
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func convert(fn string) error {
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raw, err := ioutil.ReadFile(fn)
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if err != nil {
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return fmt.Errorf("failed to read %s: %s", fn, err)
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}
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if len(raw) != total {
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return fmt.Errorf("unexpected binary length: expect=%d, actual=%d", total, len(raw))
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}
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rgba := image.NewRGBA(image.Rect(0, 0, width, actualHeight))
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for i := 0; i < width*actualHeight; i++ {
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pixel := uint16(raw[i*2+1])<<8 + uint16(raw[i*2])
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r := float64(pixel&0xf800>>11) * 255 / 31
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g := float64(pixel&0x07e0>>5) * 255 / 63
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b := float64(pixel&0x001f) * 255 / 31
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rgba.SetRGBA(i%width, actualHeight-i/width, color.RGBA{R: uint8(r), G: uint8(g), B: uint8(b), A: 255})
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}
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newFn := fn + ".png"
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out, err := os.Create(newFn)
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if err != nil {
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return fmt.Errorf("failed to create a file %s: %s", newFn, err)
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}
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defer out.Close()
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err = png.Encode(out, rgba)
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if err != nil {
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return fmt.Errorf("failed to compress the image into PNG: %s", err)
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}
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return nil
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}
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