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Correctly write transparency palette back out

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This commit is contained in:
Joshua Holmer 2016-01-12 13:23:52 -05:00
parent 534ba84052
commit c63c40b303
1 changed files with 22 additions and 0 deletions
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22
src/png.rs
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@ -228,6 +228,7 @@ impl PngData {
}
}
pub fn output(&self) -> Vec<u8> {
// FIXME: This code can all be refactored
// PNG header
let mut output = vec![0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
// IHDR
@ -266,6 +267,27 @@ impl PngData {
let crc = crc32::checksum_ieee(&palette_data);
output.append(&mut palette_data);
output.write_u32::<BigEndian>(crc).ok();
if let Some(transparency_palette) = self.transparency_palette.clone() {
// Transparency pixel
let mut palette_data = Vec::with_capacity(transparency_palette.len() + 4);
palette_data.extend("tRNS".as_bytes());
palette_data.extend(transparency_palette);
output.reserve(palette_data.len() + 8);
output.write_u32::<BigEndian>(palette_data.len() as u32 - 4).ok();
let crc = crc32::checksum_ieee(&palette_data);
output.append(&mut palette_data);
output.write_u32::<BigEndian>(crc).ok();
}
} else if let Some(transparency_pixel) = self.transparency_pixel.clone() {
// Transparency pixel
let mut pixel_data = Vec::with_capacity(transparency_pixel.len() + 4);
pixel_data.extend("tRNS".as_bytes());
pixel_data.extend(transparency_pixel);
output.reserve(pixel_data.len() + 8);
output.write_u32::<BigEndian>(pixel_data.len() as u32 - 4).ok();
let crc = crc32::checksum_ieee(&pixel_data);
output.append(&mut pixel_data);
output.write_u32::<BigEndian>(crc).ok();
}
// IDAT data
let mut idat_data = Vec::with_capacity(self.idat_data.len() + 4);