func writeImageTga(filename string, pixels []float32, xres, yres int) {
outImage := image.NewNRGBA(image.Rect(0, 0, xres, yres))
to_byte := func(v float32) uint8 {
// apply gamma and convert to 0..255
return uint8(Clamp(255.0*math.Pow(float64(v), 1.0/2.2), 0.0, 255.0))
}
for y := 0; y < yres; y++ {
for x := 0; x < xres; x++ {
var fcolor color.NRGBA
fcolor.R = to_byte(pixels[3*(y*xres+x)+2])
fcolor.G = to_byte(pixels[3*(y*xres+x)+1])
fcolor.B = to_byte(pixels[3*(y*xres+x)+0])
fcolor.A = 0xff
outImage.Set(x, y, fcolor)
}
}
f, err := os.Create(filename)
defer f.Close()
if err != nil {
Error("Error writing TGA \"%s\"", filename)
} else {
tga.Encode(f, outImage)
}
}
func encode(m image.Image, name string) (err error) {
var f *os.File
if f, err = os.Create("testdata/" + name + ".tga"); err != nil {
return
}
defer f.Close()
err = tga.Encode(f, m)
return
}
func encode(m image.Image) (err error) {
var f *os.File
if f, err = os.Create("testdata/" + dstFilename); err != nil {
return
}
defer f.Close()
err = tga.Encode(f, m)
return
}