57 lines
2.1 KiB
Rust
57 lines
2.1 KiB
Rust
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// For reading and opening files
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use png;
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use png::text_metadata::{ITXtChunk, ZTXtChunk};
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use std::env;
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use std::fs::File;
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use std::io::BufWriter;
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fn main() {
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let path = env::args()
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.nth(1)
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.expect("Expected a filename to output to.");
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let file = File::create(path).unwrap();
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let ref mut w = BufWriter::new(file);
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let mut encoder = png::Encoder::new(w, 2, 1); // Width is 2 pixels and height is 1.
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encoder.set_color(png::ColorType::Rgba);
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encoder.set_depth(png::BitDepth::Eight);
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// Adding text chunks to the header
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encoder
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.add_text_chunk(
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"Testing tEXt".to_string(),
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"This is a tEXt chunk that will appear before the IDAT chunks.".to_string(),
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)
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.unwrap();
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encoder
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.add_ztxt_chunk(
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"Testing zTXt".to_string(),
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"This is a zTXt chunk that is compressed in the png file.".to_string(),
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)
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.unwrap();
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encoder
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.add_itxt_chunk(
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"Testing iTXt".to_string(),
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"iTXt chunks support all of UTF8. Example: हिंदी.".to_string(),
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)
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.unwrap();
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let mut writer = encoder.write_header().unwrap();
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let data = [255, 0, 0, 255, 0, 0, 0, 255]; // An array containing a RGBA sequence. First pixel is red and second pixel is black.
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writer.write_image_data(&data).unwrap(); // Save
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// We can add a tEXt/zTXt/iTXt at any point before the encoder is dropped from scope. These chunks will be at the end of the png file.
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let tail_ztxt_chunk = ZTXtChunk::new(
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"Comment".to_string(),
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"A zTXt chunk after the image data.".to_string(),
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);
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writer.write_text_chunk(&tail_ztxt_chunk).unwrap();
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// The fields of the text chunk are public, so they can be mutated before being written to the file.
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let mut tail_itxt_chunk = ITXtChunk::new("Author".to_string(), "सायंतन खान".to_string());
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tail_itxt_chunk.compressed = true;
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tail_itxt_chunk.language_tag = "hi".to_string();
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tail_itxt_chunk.translated_keyword = "लेखक".to_string();
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writer.write_text_chunk(&tail_itxt_chunk).unwrap();
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}
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