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use crate::block::{Block, ColorTable, ScreenDescriptor, Version, extension::Extension};
use crate::writer::ImageBuilder;
use crate::Gif;
pub struct GifBuilder {
version: Version,
width: u16,
height: u16,
background_color_index: u8,
global_color_table: Option<ColorTable>,
blocks: Vec<Block>
}
impl GifBuilder {
pub fn new(version: Version, width: u16, height: u16) -> Self {
Self {
version,
width,
height,
background_color_index: 0,
global_color_table: None,
blocks: vec![]
}
}
pub fn global_color_table(mut self, table: ColorTable) -> Self {
self.global_color_table = Some(table);
self
}
pub fn background_color_index(mut self, ind: u8) -> Self {
if self.global_color_table.is_none() {
//TODO: Throw error or let it go by, who knows
panic!("Setting background color index with noGCT!");
}
self.background_color_index = ind;
self
}
pub fn image(mut self, ib: ImageBuilder) -> Self {
self.blocks.push(Block::IndexedImage(ib.build()));
self
}
pub fn extension(mut self, ext: Extension) -> Self {
self.blocks.push(Block::Extension(ext));
self
}
pub fn build(self) -> Gif {
let mut lsd = ScreenDescriptor {
width: self.width,
height: self.height,
packed: 0, // Set later
background_color_index: self.background_color_index,
pixel_aspect_ratio: 0 //TODO: Allow configuring
};
if let Some(gct) = &self.global_color_table {
lsd.color_table_present(true);
lsd.color_table_size(gct.len() as u8);
}
Gif {
header: self.version,
screen_descriptor: lsd,
global_color_table: self.global_color_table,
blocks: self.blocks
}
}
}
|
