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read_chunk.odin
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read_chunk.odin
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package aseprite_file_handler
import "base:intrinsics"
import "core:io"
import "core:fmt"
import "core:log"
import "core:bytes"
import "core:compress/zlib"
_::fmt
_::log
read_file_header :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (h: File_Header, err: Unmarshal_Error) {
h.size = read_dword(r, rt) or_return
if io.Stream_Mode.Size in io.query(r) {
stream_size := io.size(r) or_return
if stream_size != i64(h.size) {
return {}, .Data_Size_Not_Equal_To_Header
}
}
magic := read_word(r, rt) or_return
if magic != FILE_MAGIC_NUM {
return {}, .Bad_File_Magic_Number
}
h.frames = read_word(r, rt) or_return
h.width = read_word(r, rt) or_return
h.height = read_word(r, rt) or_return
h.color_depth = Color_Depth(read_word(r, rt) or_return)
h.flags = transmute(File_Flags)read_dword(r, rt) or_return
h.speed = read_word(r, rt) or_return
read_skip(r, 4+4, rt) or_return
h.transparent_index = read_byte(r, rt) or_return
read_skip(r, 3, rt) or_return
h.num_of_colors = read_word(r, rt) or_return
h.ratio_width = read_byte(r, rt) or_return
h.ratio_height = read_byte(r, rt) or_return
h.x = read_short(r, rt) or_return
h.y = read_short(r, rt) or_return
h.grid_width = read_word(r, rt) or_return
h.grid_height = read_word(r, rt) or_return
read_skip(r, 84, rt) or_return
return
}
read_old_palette_256 :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Old_Palette_256_Chunk, err: Unmarshal_Error) {
op_size := cast(int)read_word(r, rt) or_return
chunk = make(Old_Palette_256_Chunk, op_size, allocator) or_return
for &packet in chunk {
packet.entries_to_skip = read_byte(r, rt) or_return
packet.num_colors = read_byte(r, rt) or_return
count := int(packet.num_colors)
if count == 0 {
count = 256
}
packet.colors = make([]Color_RGB, count, allocator) or_return
for &c in packet.colors {
// TODO: Maybe read into an array???
c[0] = read_byte(r, rt) or_return
c[1] = read_byte(r, rt) or_return
c[2] = read_byte(r, rt) or_return
}
}
return
}
read_old_palette_64 :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Old_Palette_64_Chunk, err: Unmarshal_Error) {
op_size := cast(int)read_word(r, rt) or_return
chunk = make(Old_Palette_64_Chunk, op_size, allocator) or_return
for &packet in chunk {
packet.entries_to_skip = read_byte(r, rt) or_return
packet.num_colors = read_byte(r, rt) or_return
count := int(packet.num_colors)
if count == 0 {
count = 256
}
packet.colors = make([]Color_RGB, count, allocator) or_return
for &c in packet.colors {
// TODO: Maybe read into an array???
c[0] = read_byte(r, rt) or_return
c[1] = read_byte(r, rt) or_return
c[2] = read_byte(r, rt) or_return
}
}
return
}
read_layer :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Layer_Chunk, err: Unmarshal_Error) {
chunk.flags = transmute(Layer_Chunk_Flags)read_word(r, rt) or_return
chunk.type = Layer_Types(read_word(r, rt) or_return)
chunk.child_level = read_word(r, rt) or_return
chunk.default_width = read_word(r, rt) or_return
chunk.default_height = read_word(r, rt) or_return
chunk.blend_mode = Layer_Blend_Mode(read_word(r, rt) or_return)
chunk.opacity = read_byte(r, rt) or_return
read_skip(r, 3, rt) or_return
chunk.name = read_string(r, rt, allocator) or_return
if chunk.type == .Tilemap {
chunk.tileset_index = read_dword(r, rt) or_return
}
return
}
read_cel :: proc(r: io.Reader, rt: ^int, color_depth: int, c_size: int, allocator := context.allocator) -> (chunk: Cel_Chunk, err: Unmarshal_Error) {
context.allocator = allocator
chunk.layer_index = read_word(r, rt) or_return
chunk.x = read_short(r, rt) or_return
chunk.y = read_short(r, rt) or_return
chunk.opacity_level = read_byte(r, rt) or_return
chunk.type = Cel_Types(read_word(r, rt) or_return)
chunk.z_index = read_short(r, rt) or_return
read_skip(r, 5, rt) or_return
switch chunk.type {
case .Raw:
cel: Raw_Cel
cel.width = read_word(r, rt) or_return
cel.height = read_word(r, rt) or_return
cel.pixel = make([]PIXEL, int(cel.width * cel.height)) or_return
read_bytes(r, cel.pixel[:], rt) or_return
chunk.cel = cel
case .Linked_Cel:
chunk.cel = Linked_Cel(read_word(r, rt) or_return)
case .Compressed_Image:
cel: Com_Image_Cel
cel.width = read_word(r, rt) or_return
cel.height = read_word(r, rt) or_return
com_size := c_size-26
if com_size <= 0 {
err = .Invalid_Compression_Size
return
}
buf: bytes.Buffer
defer bytes.buffer_destroy(&buf)
data := make([]byte, com_size) or_return
defer delete(data)
read_bytes(r, data[:], rt) or_return
exp_size := color_depth / 8 * int(cel.height) * int(cel.width)
zlib.inflate(data[:], &buf, expected_output_size=exp_size) or_return
cel.pixel = make([]byte, exp_size) or_return
copy(cel.pixel[:], buf.buf[:])
chunk.cel = cel
case .Compressed_Tilemap:
cel: Com_Tilemap_Cel
cel.width = read_word(r, rt) or_return
cel.height = read_word(r, rt) or_return
cel.bits_per_tile = read_word(r, rt) or_return
cel.bitmask_id = Tile_ID(read_dword(r, rt) or_return)
cel.bitmask_x = read_dword(r, rt) or_return
cel.bitmask_y = read_dword(r, rt) or_return
cel.bitmask_diagonal = read_dword(r, rt) or_return
read_skip(r, 10, rt) or_return
buf: bytes.Buffer
defer bytes.buffer_destroy(&buf)
// size_of(DWORD*5, WORD*6, SHORT*3, BYTE, SKIPED*15)-1
com_size := c_size-54
if com_size <= 0 {
err = .Invalid_Compression_Size
return
}
data := make([]byte, com_size) or_return
defer delete(data)
read_bytes(r, data[:], rt) or_return
exp_size := color_depth / 8 * int(cel.height) * int(cel.width)
zlib.inflate(data[:], &buf, expected_output_size=exp_size) or_return
br: bytes.Reader
bytes.reader_init(&br, buf.buf[:])
rr, ok := io.to_reader(bytes.reader_to_stream(&br))
if !ok { err = .Unable_Make_Reader; return }
cel.tiles = make([]TILE, cel.height * cel.width) or_return
read_tiles(rr, cel.tiles[:], cel.bitmask_id, rt) or_return
chunk.cel = cel
case:
err = .Invalid_Cel_Type
return
}
return
}
read_cel_extra :: proc(r: io.Reader, rt: ^int) -> (chunk: Cel_Extra_Chunk, err: Unmarshal_Error) {
chunk.flags = transmute(Cel_Extra_Flags)read_word(r, rt) or_return
chunk.x = read_fixed(r, rt) or_return
chunk.y = read_fixed(r, rt) or_return
chunk.width = read_fixed(r, rt) or_return
chunk.height = read_fixed(r, rt) or_return
return
}
read_color_profile :: proc(r: io.Reader, rt: ^int, warned: ^bool, allocator := context.allocator) -> (chunk: Color_Profile_Chunk, err: Unmarshal_Error) {
chunk.type = Color_Profile_Type(read_word(r, rt) or_return)
chunk.flags = transmute(Color_Profile_Flags)read_word(r, rt) or_return
chunk.fixed_gamma = read_fixed(r, rt) or_return
read_skip(r, 8, rt) or_return
if chunk.type == .ICC {
icc_size := cast(int)read_dword(r, rt) or_return
chunk.icc = make(ICC_Profile, icc_size, allocator) or_return
read_bytes(r, cast([]u8)chunk.icc.(ICC_Profile)[:], rt) or_return
if !warned^ {
log.warn("Embedded ICC Color Profiles are currently not supported.")
warned^ = true
}
}
return
}
read_external_files :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: External_Files_Chunk, err: Unmarshal_Error) {
entries := read_dword(r, rt) or_return
chunk = make([]External_Files_Entry, entries, allocator) or_return
read_skip(r, 8, rt) or_return
for &entry in chunk {
entry.id = read_dword(r, rt) or_return
entry.type = ExF_Entry_Type(read_byte(r, rt) or_return)
read_skip(r, 7, rt) or_return
entry.file_name_or_id = read_string(r, rt, allocator) or_return
}
return
}
read_mask :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Mask_Chunk, err: Unmarshal_Error) {
chunk.x = read_short(r, rt) or_return
chunk.y = read_short(r, rt) or_return
chunk.width = read_word(r, rt) or_return
chunk.height = read_word(r, rt) or_return
read_skip(r, 8, rt) or_return
chunk.name = read_string(r, rt, allocator) or_return
size := int(chunk.height) * ((int(chunk.width) + 7) / 8)
chunk.bit_map_data = make([]BYTE, size, allocator) or_return
read_bytes(r, chunk.bit_map_data[:], rt) or_return
return
}
read_path :: proc() -> (chunk: Path_Chunk) {
return
}
read_tags :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Tags_Chunk, err: Unmarshal_Error) {
size := cast(int)read_word(r, rt) or_return
chunk = make([]Tag, size, allocator) or_return
read_skip(r, 8, rt) or_return
for &tag in chunk {
tag.from_frame = read_word(r, rt) or_return
tag.to_frame = read_word(r, rt) or_return
tag.loop_direction = Tag_Loop_Dir(read_byte(r, rt) or_return)
tag.repeat = read_word(r, rt) or_return
read_skip(r, 6, rt) or_return
// TODO: Maybe read into an array???
tag.tag_color[0] = read_byte(r, rt) or_return
tag.tag_color[1] = read_byte(r, rt) or_return
tag.tag_color[2] = read_byte(r, rt) or_return
read_byte(r, rt) or_return
tag.name = read_string(r, rt, allocator) or_return
}
return
}
read_palette :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Palette_Chunk, err: Unmarshal_Error) {
chunk.size = read_dword(r, rt) or_return
chunk.first_index = read_dword(r, rt) or_return
chunk.last_index = read_dword(r, rt) or_return
size := int(chunk.last_index - chunk.first_index + 1)
chunk.entries = make([]Palette_Entry, size, allocator) or_return
read_skip(r, 8, rt) or_return
for &entry in chunk.entries {
// TODO: Maybe read into an array???
pf := transmute(Pal_Flags)read_word(r, rt) or_return
entry.color[0] = read_byte(r, rt) or_return
entry.color[1] = read_byte(r, rt) or_return
entry.color[2] = read_byte(r, rt) or_return
entry.color[3] = read_byte(r, rt) or_return
if .Has_Name in pf {
entry.name = read_string(r, rt, allocator) or_return
}
}
return
}
read_user_data :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: User_Data_Chunk, err: Unmarshal_Error) {
flags := transmute(UD_Flags)read_dword(r, rt) or_return
if .Text in flags {
chunk.text = read_string(r, rt) or_return
}
if .Color in flags {
// TODO: Maybe read into an array???
colour: Color_RGBA
colour[0] = read_byte(r, rt) or_return
colour[1] = read_byte(r, rt) or_return
colour[2] = read_byte(r, rt) or_return
colour[3] = read_byte(r, rt) or_return
chunk.color = colour
}
if .Properties in flags {
//map_size := read_dword(r, rt) or_return
read_skip(r, 4, rt) or_return
map_num := read_dword(r, rt) or_return
maps := make(Properties_Map, map_num) or_return
for _ in 0..<int(map_num) {
key := read_dword(r, rt) or_return
prop_num := int(read_dword(r, rt) or_return)
val := make(Properties, prop_num) or_return
for _ in 0..<prop_num {
name := read_string(r, rt) or_return
defer delete(name)
type := Property_Type(read_word(r, rt) or_return)
val[name] = read_ud_value(r, type, rt) or_return
}
maps[key] = val
}
chunk.maps = maps
}
return
}
read_slice :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Slice_Chunk, err: Unmarshal_Error) {
keys := int(read_dword(r, rt) or_return)
chunk.flags = transmute(Slice_Flags)read_dword(r, rt) or_return
read_dword(r, rt) or_return
chunk.name = read_string(r, rt) or_return
chunk.keys = make([]Slice_Key, keys, allocator) or_return
for &key in chunk.keys {
key.frame_num = read_dword(r, rt) or_return
key.x = read_long(r, rt) or_return
key.y = read_long(r, rt) or_return
key.width = read_dword(r, rt) or_return
key.height = read_dword(r, rt) or_return
if .Patched_slice in chunk.flags {
cen: Slice_Center
cen.x = read_long(r, rt) or_return
cen.y = read_long(r, rt) or_return
cen.width = read_dword(r, rt) or_return
cen.height = read_dword(r, rt) or_return
key.center = cen
}
if .Pivot_Information in chunk.flags {
p: Slice_Pivot
p.x = read_long(r, rt) or_return
p.y = read_long(r, rt) or_return
key.pivot = p
}
}
return
}
read_tileset :: proc(r: io.Reader, rt: ^int, allocator := context.allocator) -> (chunk: Tileset_Chunk, err: Unmarshal_Error) {
chunk.id = read_dword(r, rt) or_return
flags := transmute(Tileset_Flags)read_dword(r, rt) or_return
chunk.num_of_tiles = read_dword(r, rt) or_return
chunk.width = read_word(r, rt) or_return
chunk.height = read_word(r, rt) or_return
chunk.base_index = read_short(r, rt) or_return
read_skip(r, 14, rt)
chunk.name = read_string(r, rt) or_return
if .Include_Link_To_External_File in flags {
ex: Tileset_External
ex.file_id = read_dword(r, rt) or_return
ex.tileset_id = read_dword(r, rt) or_return
chunk.external = ex
}
if .Include_Tiles_Inside_This_File in flags {
tc: Tileset_Compressed
size := int(read_dword(r, rt) or_return)
buf: bytes.Buffer
defer bytes.buffer_destroy(&buf)
data := make([]byte, size, allocator) or_return
defer delete(data)
read_bytes(r, data[:], rt) or_return
exp_size := int(chunk.width) * int(chunk.height) * int(chunk.num_of_tiles)
zlib.inflate(data[:], &buf, expected_output_size=exp_size) or_return
tc = make(Tileset_Compressed, exp_size, allocator) or_return
copy(tc[:], cast(Tileset_Compressed)buf.buf[:])
chunk.compressed = tc
}
return
}