42 lines
963 B
Rust
42 lines
963 B
Rust
//! TARGA format images.
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use crate::{err::*, image::*};
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use std::io;
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/// Writes a TGA file from an image.
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///
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/// # Errors
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///
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/// Errors if `out` cannot be written to.
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pub fn write_tga(out: &mut impl io::Write, im: &impl Image) -> ResultS<()>
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{
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// id len, color map type, image type
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out.write_all(&[0, 0, 2])?;
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// color map spec
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out.write_all(&[0, 0, 0, 0, 0])?;
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// x origin
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out.write_all(&[0, 0])?;
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// y origin
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out.write_all(&[0, 0])?;
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// width
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out.write_all(&u16::to_le_bytes(im.w() as u16))?;
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// height
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out.write_all(&u16::to_le_bytes(im.h() as u16))?;
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// depth, descriptor
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out.write_all(&[32, 0])?;
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for y in (0..im.h()).rev() {
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for x in 0..im.w() {
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let cr = im.index(x, y);
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out.write_all(&[(cr.b() >> 8) as u8,
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(cr.g() >> 8) as u8,
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(cr.r() >> 8) as u8,
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(cr.a() >> 8) as u8])?;
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}
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}
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Ok(())
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}
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// EOF
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