nsgif__parse_colour_table()

static nsgif_error fl::third_party::nsgif__parse_colour_table ( struct nsgif * gif, struct nsgif_frame * frame, const fl::u8 ** pos, bool decode )

static

Get a frame's colour table.

Sets up gif->colour_table for the frame.

Parameters

[in]	gif	The gif object we're decoding.
[in]	frame	The frame to get the colour table for.
[in]	pos	Current position in data, updated on exit.
[in]	decode	Whether to decode the colour table.

Returns

NSGIF_OK on success, appropriate error otherwise.

Definition at line 1148 of file gif.cpp.hpp.

{
    nsgif_error ret;
    const fl::u8 *data = *pos;
    fl::size len = gif->buf + gif->buf_len - data;
    fl::size used_bytes;
 
    FL_ASSERT(gif != nullptr, "GIF object required");
    FL_ASSERT(frame != nullptr, "Frame object required");
 
    if ((frame->flags & NSGIF_COLOUR_TABLE_MASK) == 0) {
        gif->colour_table = gif->global_colour_table;
        return NSGIF_OK;
    }
 
    if (decode == false) {
        frame->colour_table_offset = *pos - gif->buf;
    }
 
    ret = nsgif__colour_table_extract(
            gif->local_colour_table, &gif->colour_layout,
            2 << (frame->flags & NSGIF_COLOUR_TABLE_SIZE_MASK),
            data, len, &used_bytes, decode);
    if (ret != NSGIF_OK) {
        return ret;
    }
    *pos += used_bytes;
 
    if (decode) {
        gif->colour_table = gif->local_colour_table;
    } else {
        frame->info.local_palette = true;
    }
 
    return NSGIF_OK;
}

References FL_ASSERT, FL_NOEXCEPT, nsgif__colour_table_extract(), NSGIF_COLOUR_TABLE_MASK, NSGIF_COLOUR_TABLE_SIZE_MASK, NSGIF_OK, and pos.

Referenced by nsgif__process_frame().

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