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//! Exports each GIF frame as a separate image.
use std::env;
use std::fs::File;
use std::path::PathBuf;
fn main() -> Result<(), Box<dyn std::error::Error>> {
let input_path = PathBuf::from(
env::args_os()
.nth(1)
.ok_or("Specify a GIF path as the first argument")?,
);
let input = File::open(&input_path)?;
let mut options = gif::DecodeOptions::new();
options.set_color_output(gif::ColorOutput::Indexed);
let mut decoder = options.read_info(input)?;
let screen_width = decoder.width();
let screen_height = decoder.height();
let global_pal = decoder.global_palette().unwrap_or_default().to_vec();
let output_file_stem = input_path.file_stem().unwrap().to_str().unwrap();
let mut frame_number = 1;
while let Some(frame) = decoder.read_next_frame()? {
let output_path = format!("{}.{:03}.gif", output_file_stem, frame_number);
let mut output = File::create(&output_path)?;
let mut encoder = gif::Encoder::new(&mut output, screen_width, screen_height, &global_pal)?;
encoder.write_frame(&frame)?;
frame_number += 1;
use gif::DisposalMethod::*;
let disposal = match frame.dispose {
Any => "any",
Keep => "keep",
Background => "background",
Previous => "previous",
};
eprintln!(
"Written {} ({}x{}@{}x{} delay={} {})",
output_path, frame.width, frame.height, frame.top, frame.left, frame.delay, disposal
);
}
Ok(())
}
|
