image.decoders.common

fn new_bitreader_lsb(data []u8) BitReader

new_bitreader_lsb creates an LSB-first reader.

fn new_bitreader_msb(data []u8) BitReader

new_bitreader_msb creates an MSB-first reader.

struct Animation {
pub:
	frames     []Frame
	loop_count int // 0 = forever, >= 1 finite
}

Animation is a sequence of frames with a loop count.

struct BitReader {
mut:
	data     []u8
	byte_pos int
	bit_pos  int // bits already consumed in the current byte (0..8)
	msb      bool
}

BitReader reads bits from a byte buffer in either LSB-first (GIF/WebP) or MSB-first (JPEG) order. Format-specific byte stuffing (e.g. JPEG FF00) is handled by the caller.

fn (mut r BitReader) read_bits(n int) !u32

read_bits reads up to 32 bits and returns them as a u32. Bits are assembled in the order they are read.

fn (mut r BitReader) align_bytes()

align_bytes skips to the next byte boundary (no-op if already aligned).

fn (r BitReader) remaining() int

remaining returns the number of whole bytes left (approximate).

struct Frame {
pub:
	image    Image
	delay_ms int
	disposal int
}

Frame is one coalesced animation frame.

struct Image {
pub:
	width  int
	height int
	rgba   []u8 // len == width * height * 4
}

Image is a decoded, top-down RGBA image (straight, non-premultiplied alpha).