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// Copyright 2020 The Wuffs Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
pub status "#bad header"
pub status "#unsupported NIE file"
pri status "@internal note: short read"
pub const DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE : base.u64 = 0
pub struct decoder? implements base.image_decoder(
pixfmt : base.u32,
width : base.u32[..= 0x7FFF_FFFF],
height : base.u32[..= 0x7FFF_FFFF],
// Call sequence states:
// - 0x00: initial state.
// - 0x03: image config decoded.
// - 0x04: frame config decoded.
// - 0xFF: end-of-data, usually after (the non-animated) frame decoded.
//
// State transitions:
//
// - 0x00 -> 0x03: via DIC
// - 0x00 -> 0x04: via DFC with implicit DIC
// - 0x00 -> 0xFF: via DF with implicit DIC and DFC
//
// - 0x03 -> 0x04: via DFC
// - 0x03 -> 0xFF: via DF with implicit DFC
//
// - 0x04 -> 0xFF: via DFC
// - 0x04 -> 0xFF: via DF
//
// - ???? -> 0x03: via RF for ???? > 0x00
//
// Where:
// - DF is decode_frame
// - DFC is decode_frame_config, implicit means nullptr args.dst
// - DIC is decode_image_config, implicit means nullptr args.dst
// - RF is restart_frame
call_sequence : base.u8,
dst_x : base.u32,
dst_y : base.u32,
swizzler : base.pixel_swizzler,
util : base.utility,
)
pub func decoder.set_quirk_enabled!(quirk: base.u32, enabled: base.bool) {
}
pub func decoder.decode_image_config?(dst: nptr base.image_config, src: base.io_reader) {
var a : base.u32
if this.call_sequence <> 0 {
return base."#bad call sequence"
}
a = args.src.read_u32le?()
if a <> 'nĂ¯E'le {
return "#bad header"
}
a = args.src.read_u32le?()
if a == '\xFFbn4'le {
this.pixfmt = base.PIXEL_FORMAT__BGRA_NONPREMUL
} else if a == '\xFFbn8'le {
this.pixfmt = base.PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE
} else if a == '\xFFbp4'le {
return "#unsupported NIE file"
} else if a == '\xFFbp8'le {
return "#unsupported NIE file"
} else {
return "#bad header"
}
a = args.src.read_u32le?()
if a >= 0x8000_0000 {
return "#bad header"
}
this.width = a
a = args.src.read_u32le?()
if a >= 0x8000_0000 {
return "#bad header"
}
this.height = a
if args.dst <> nullptr {
args.dst.set!(
pixfmt: this.pixfmt,
pixsub: 0,
width: this.width,
height: this.height,
first_frame_io_position: 16,
first_frame_is_opaque: false)
}
this.call_sequence = 3
}
pub func decoder.decode_frame_config?(dst: nptr base.frame_config, src: base.io_reader) {
if this.call_sequence < 3 {
this.decode_image_config?(dst: nullptr, src: args.src)
} else if this.call_sequence == 3 {
if 16 <> args.src.position() {
return base."#bad restart"
}
} else if this.call_sequence == 4 {
this.call_sequence = 0xFF
return base."@end of data"
} else {
return base."@end of data"
}
if args.dst <> nullptr {
args.dst.set!(bounds: this.util.make_rect_ie_u32(
min_incl_x: 0,
min_incl_y: 0,
max_excl_x: this.width,
max_excl_y: this.height),
duration: 0,
index: 0,
io_position: 16,
disposal: 0,
opaque_within_bounds: false,
overwrite_instead_of_blend: false,
background_color: 0x0000_0000)
}
this.call_sequence = 4
}
pub func decoder.decode_frame?(dst: ptr base.pixel_buffer, src: base.io_reader, blend: base.pixel_blend, workbuf: slice base.u8, opts: nptr base.decode_frame_options) {
var status : base.status
if this.call_sequence < 4 {
this.decode_frame_config?(dst: nullptr, src: args.src)
} else if this.call_sequence == 4 {
// No-op.
} else {
return base."@end of data"
}
this.dst_x = 0
this.dst_y = 0
status = this.swizzler.prepare!(
dst_pixfmt: args.dst.pixel_format(),
dst_palette: args.dst.palette(),
src_pixfmt: this.util.make_pixel_format(repr: this.pixfmt),
src_palette: this.util.empty_slice_u8(),
blend: args.blend)
if not status.is_ok() {
return status
}
while true {
status = this.swizzle!(dst: args.dst, src: args.src)
if status.is_ok() {
break
} else if status <> "@internal note: short read" {
return status
}
yield? base."$short read"
} endwhile
this.call_sequence = 0xFF
}
pri func decoder.swizzle!(dst: ptr base.pixel_buffer, src: base.io_reader) base.status {
var dst_pixfmt : base.pixel_format
var dst_bits_per_pixel : base.u32[..= 256]
var dst_bytes_per_pixel : base.u64[..= 32]
var dst_bytes_per_row : base.u64
var tab : table base.u8
var dst : slice base.u8
var i : base.u64
var n : base.u64
// TODO: the dst_pixfmt variable shouldn't be necessary. We should be able
// to chain the two calls: "args.dst.pixel_format().bits_per_pixel()".
dst_pixfmt = args.dst.pixel_format()
dst_bits_per_pixel = dst_pixfmt.bits_per_pixel()
if (dst_bits_per_pixel & 7) <> 0 {
return base."#unsupported option"
}
dst_bytes_per_pixel = (dst_bits_per_pixel / 8) as base.u64
dst_bytes_per_row = (this.width as base.u64) * dst_bytes_per_pixel
tab = args.dst.plane(p: 0)
while true {
if this.dst_x == this.width {
this.dst_x = 0
this.dst_y ~mod+= 1
if this.dst_y >= this.height {
break
}
}
dst = tab.row_u32(y: this.dst_y)
if dst_bytes_per_row < dst.length() {
dst = dst[.. dst_bytes_per_row]
}
i = (this.dst_x as base.u64) * dst_bytes_per_pixel
if i >= dst.length() {
// TODO: advance args.src if the dst pixel_buffer bounds is
// smaller than this NIE's image bounds?
continue
}
n = this.swizzler.swizzle_interleaved_from_reader!(
dst: dst[i ..],
dst_palette: args.dst.palette(),
src: args.src)
if n == 0 {
return "@internal note: short read"
}
this.dst_x ~sat+= (n & 0xFFFF_FFFF) as base.u32
} endwhile
return ok
}
pub func decoder.frame_dirty_rect() base.rect_ie_u32 {
return this.util.make_rect_ie_u32(
min_incl_x: 0,
min_incl_y: 0,
max_excl_x: this.width,
max_excl_y: this.height)
}
pub func decoder.num_animation_loops() base.u32 {
return 0
}
pub func decoder.num_decoded_frame_configs() base.u64 {
if this.call_sequence > 3 {
return 1
}
return 0
}
pub func decoder.num_decoded_frames() base.u64 {
if this.call_sequence > 4 {
return 1
}
return 0
}
pub func decoder.restart_frame!(index: base.u64, io_position: base.u64) base.status {
if this.call_sequence < 3 {
return base."#bad call sequence"
}
if (args.index <> 0) or (args.io_position <> 16) {
return base."#bad argument"
}
this.call_sequence = 3
return ok
}
pub func decoder.set_report_metadata!(fourcc: base.u32, report: base.bool) {
// No-op. NIE doesn't support metadata.
}
pub func decoder.tell_me_more?(dst: base.io_writer, minfo: nptr base.more_information, src: base.io_reader) {
return base."#no more information"
}
pub func decoder.workbuf_len() base.range_ii_u64 {
return this.util.make_range_ii_u64(min_incl: 0, max_incl: 0)
}