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; Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson

; (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

; (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

; For conditions of distribution and use, see the disclaimer

; and license in png.inc

; The only people who need to care about what is inside of this are the

; people who will be modifying the library for their own special needs.

; It should NOT be accessed directly by an application.

; in this structure and is required for decompressing the LZ compressed

; data in PNG files.

; can handle at once.  This type need be no larger than 16 bits (so maximum of

; 65535), this define allows us to discover how big it is, but limited by the

; maximuum for png_size_t.  The value can be overriden in a library build

; (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably

; lower value (e.g. 255 works).  A lower value may help memory usage (slightly)

; and may even improve performance on some systems (and degrade it on others.)

struct png_compression_buffer

	next dd ? ;struct png_compression_buffer *

	output db ? ;byte[1] ;actually zbuf_size

ends

{

	mov eax,png_compression_buffer.output

	add eax,[pp+png_struct.zbuffer_size]

}

; functions to hold and communicate information about the color space.

; colorspace corrections, otherwise all the colorspace information can be

; skipped and the size of libpng can be reduced (significantly) by compiling

; out the colorspace support.

; The chromaticities of the red, green and blue colorants and the chromaticity

; of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).

	redx   dd ? ;png_fixed_point

	redy   dd ?

	greenx dd ?

	greeny dd ?

	bluex  dd ?

	bluey  dd ?

	whitex dd ?

	whitey dd ?

ends

; from chromaticities the sum of the Y values is assumed to be 1.0

	red_X dd ? ;png_fixed_point

	red_Y dd ?

	red_Z dd ?

	green_X dd ?

	green_Y dd ?

	green_Z dd ?

	blue_X dd ?

	blue_Y dd ?

	blue_Z dd ?

ends

end if ;COLORSPACE

; A colorspace is all the above plus, potentially, profile information;

; however at present libpng does not use the profile internally so it is only

; stored in the png_info struct (if iCCP is supported.)  The rendering intent

; is retained here and is checked.

; is done by libpng, whereas color correction must currently be done by the

; application.

if PNG_GAMMA_SUPPORTED eq 1

	gamma dd ? ;png_fixed_point ;File gamma

end if

	end_points_xy png_xy ;End points as chromaticities

	end_points_XYZ png_XYZ ;End points as CIE XYZ colorant values

	rendering_intent dw ? ;uint_16 ;Rendering intent of a profile

end if

	flags dw ? ;uint_16 ;As defined below

ends

PNG_COLORSPACE_HAVE_GAMMA     equ 0x0001

PNG_COLORSPACE_HAVE_ENDPOINTS equ 0x0002

PNG_COLORSPACE_HAVE_INTENT    equ 0x0004

PNG_COLORSPACE_FROM_gAMA      equ 0x0008

PNG_COLORSPACE_FROM_cHRM      equ 0x0010

PNG_COLORSPACE_FROM_sRGB      equ 0x0020

PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB equ 0x0040

PNG_COLORSPACE_MATCHES_sRGB   equ 0x0080 ;exact match on profile

PNG_COLORSPACE_INVALID        equ 0x8000

macro PNG_COLORSPACE_CANCEL flags {(0xffff xor (flags))}

end if ;COLORSPACE || GAMMA

if PNG_SETJMP_SUPPORTED eq 1

	jmp_buf_local rb 64 ;jmp_buf ;New name in 1.6.0 for jmp_buf in png_struct

	longjmp_fn   dd ? ;png_longjmp_ptr ;setjmp non-local goto function.

	jmp_buf_ptr  dd ? ;jmp_buf * ;passed to longjmp_fn

	jmp_buf_size dd ? ;size_t ;size of the above, if allocated

end if

	error_fn dd ? ;png_error_ptr ;function for printing errors and aborting

if PNG_WARNINGS_SUPPORTED eq 1

	warning_fn dd ? ;png_error_ptr ;function for printing warnings

end if

	error_ptr dd ? ;voidp ;user supplied struct for error functions

	write_data_fn dd ? ;png_rw_ptr ;function for writing output data

	read_data_fn dd ? ;png_rw_ptr ;function for reading input data

	io_ptr dd ? ;voidp ;ptr to application struct for I/O functions

	read_user_transform_fn dd ? ;png_user_transform_ptr ;user read transform

end if

	write_user_transform_fn dd ? ;png_user_transform_ptr ; user write transform

end if

if PNG_USER_TRANSFORM_PTR_SUPPORTED eq 1

if (PNG_READ_USER_TRANSFORM_SUPPORTED eq 1) | (PNG_WRITE_USER_TRANSFORM_SUPPORTED eq 1)

	user_transform_ptr dd ? ;voidp ;user supplied struct for user transform

	user_transform_depth db ? ;byte ;bit depth of user transformed pixels

	user_transform_channels db ? ;byte ;channels in user transformed pixels

	rb 2 ;align

end if

end if

	flags dd ? ;uint_32 ;flags indicating various things to libpng

	transformations dd ? ;uint_32 ;which transformations to perform

	zstream z_stream ;decompression structure

	zbuffer_size dd ? ;uInt ;size of the actual buffer

	zlib_method dd ? ;int ;holds zlib compression method

	zlib_window_bits dd ? ;int ;holds zlib compression window bits

	zlib_mem_level dd ? ;int ;holds zlib compression memory level

	zlib_strategy  dd ? ;int ;holds zlib compression strategy

; Added at libpng 1.5.4

if PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED eq 1

	zlib_text_level  dd ? ;int ;holds zlib compression level

	zlib_text_method dd ? ;int ;holds zlib compression method

	zlib_text_window_bits dd ? ;int ;holds zlib compression window bits

	zlib_text_mem_level dd ? ;int ;holds zlib compression memory level

	zlib_text_strategy  dd ? ;int ;holds zlib compression strategy

end if

;End of material added at libpng 1.5.4

;Added at libpng 1.6.0

	zlib_set_level  dd ? ;int ;Actual values set into the zstream on write

	zlib_set_method dd ? ;int

	zlib_set_window_bits dd ? ;int

	zlib_set_mem_level dd ? ;int

	zlib_set_strategy  dd ? ;int

	height   dd ? ;uint_32 ;height of image in pixels

	num_rows dd ? ;uint_32 ;number of rows in current pass

	usr_width dd ? ;uint_32 ;width of row at start of write

	rowbytes  dd ? ;png_size_t ;size of row in bytes

	iwidth     dd ? ;uint_32 ;width of current interlaced row in pixels

	row_number dd ? ;uint_32 ;current row in interlace pass

	chunk_name dd ? ;uint_32 ;PNG_CHUNK() id of current chunk

	prev_row dd ? ;bytep ;buffer to save previous (unfiltered) row.

			;While reading this is a pointer into

			;big_prev_row; while writing it is separately

			;allocated if needed.

			;While reading, this is a pointer into

			;big_row_buf; while writing it is separately

			;allocated.

	try_row dd ? ;bytep ;buffer to save trial row when filtering

	tst_row dd ? ;bytep ;buffer to save best trial row when filtering

end if

	info_rowbytes dd ? ;png_size_t ;Added in 1.5.4: cache of updated row bytes

	crc dd ? ;uint_32 ;current chunk CRC value

	palette dd ? ;png_colorp ;palette from the input file

	num_palette dw ? ;uint_16 ;number of color entries in palette

	rb 2 ;align

; Added at libpng-1.5.10

if PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED eq 1

	num_palette_max dd ? ;int ;maximum palette index found in IDAT

end if

	compression db ? ;byte ;file compression type (always 0)

	filter      db ? ;byte ;file filter type (always 0)

	interlaced  db ? ;byte ;PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7

	pass        db ? ;byte ;current interlace pass (0 - 6)

	do_filter   db ? ;byte ;row filter flags (see PNG_FILTER_ in png.inc)

	color_type   db ? ;byte ;color type of file

	bit_depth    db ? ;byte ;bit depth of file

	usr_bit_depth db ? ;byte ;bit depth of users row: write only

	pixel_depth  db ? ;byte ;number of bits per pixel

	channels     db ? ;byte ;number of channels in file

	usr_channels db ? ;byte ;channels at start of write: write only

	sig_bytes    db ? ;byte ;magic bytes read/written from start of file

	maximum_pixel_depth db ? ;byte ;pixel depth used for the row buffers

	transformed_pixel_depth db ? ;byte ;pixel depth after read/write transforms

;if PNG_ZLIB_VERNUM >= 0x1240

	;zstream_start db 1 ;byte ;at start of an input zlib stream

;end if ;Zlib >= 1.2.4

if (PNG_READ_FILLER_SUPPORTED eq 1) | (PNG_WRITE_FILLER_SUPPORTED eq 1)

	filler dw ? ;uint_16 ;filler bytes for pixel expansion

end if

	(PNG_READ_ALPHA_MODE_SUPPORTED eq 1)

	background_gamma_type db ? ;byte

	rb 1 ;align

	background_gamma dd ? ;png_fixed_point

	background png_color_16 ;background color in screen gamma space

	rb 1 ;align

if PNG_READ_GAMMA_SUPPORTED eq 1

	background_1 png_color_16 ;background normalized to gamma 1.0

	rb 1 ;align

end if

end if ;bKGD

	output_flush_fn dd ? ;png_flush_ptr ;Function for flushing output

	flush_dist dd ? ;uint_32 ;how many rows apart to flush, 0 - no flush

	flush_rows dd ? ;uint_32 ;number of rows written since last flush

end if

	gamma_shift  dd ? ;int ;number of "insignificant" bits in 16-bit gamma

	screen_gamma dd ? ;png_fixed_point ;screen gamma value (display_exponent)

	gamma_16_table dd ? ;uint_16pp ;gamma table for 16-bit depth files

if (PNG_READ_BACKGROUND_SUPPORTED eq 1) | \

	(PNG_READ_ALPHA_MODE_SUPPORTED eq 1) | \

	(PNG_READ_RGB_TO_GRAY_SUPPORTED eq 1)

	gamma_from_1  dd ? ;bytep ;converts from 1.0 to screen

	gamma_to_1    dd ? ;bytep ;converts from file to 1.0

	gamma_16_from_1 dd ? ;uint_16pp ;converts from 1.0 to screen

	gamma_16_to_1   dd ? ;uint_16pp ;converts from file to 1.0

end if ;READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY

end if

	sig_bit png_color_8 ;significant bits in each available channel

end if

	shift   png_color_8 ;shift for significant bit tranformation

	rb 2 ;align

end if

	| (PNG_READ_EXPAND_SUPPORTED eq 1) | (PNG_READ_BACKGROUND_SUPPORTED eq 1)

	trans_alpha dd ? ;bytep ;alpha values for paletted files

	trans_color png_color_16 ;transparent color for non-paletted files

	rb 3 ;align

end if

	write_row_fn dd ? ;png_write_status_ptr ;called after each row is encoded

if PNG_PROGRESSIVE_READ_SUPPORTED eq 1

	info_fn      dd ? ;png_progressive_info_ptr ;called after header data fully read

	row_fn        dd ? ;png_progressive_row_ptr ;called after a prog. row is decoded

	end_fn         dd ? ;png_progressive_end_ptr ;called after image is complete

	save_buffer_ptr dd ? ;bytep ;current location in save_buffer

	save_buffer      dd ? ;bytep ;buffer for previously read data

	current_buffer_ptr dd ? ;bytep ;current location in current_buffer

	current_buffer   dd ? ;bytep ;buffer for recently used data

	push_length      dd ? ;uint_32 ;size of current input chunk

	skip_length      dd ? ;uint_32 ;bytes to skip in input data

	save_buffer_size dd ? ;png_size_t ;amount of data now in save_buffer

	save_buffer_max  dd ? ;png_size_t ;total size of save_buffer

	buffer_size      dd ? ;png_size_t ;total amount of available input data

	current_buffer_size dd ? ;png_size_t ;amount of data now in current_buffer

	process_mode     dd ? ;int ;what push library is currently doing

	cur_palette      dd ? ;int ;current push library palette index

	palette_lookup dd ? ;bytep ;lookup table for quantizing

	quantize_index dd ? ;bytep ;index translation for palette files

end if

if PNG_SET_OPTION_SUPPORTED eq 1

	options db ? ;byte ;On/off state (up to 4 options)

end if

; To do: remove this from libpng-1.7

if PNG_TIME_RFC1123_SUPPORTED eq 1

	time_buffer rb 29 ;char[29] ;String to hold RFC 1123 time text

	rb 2 ;align

end if

;end if

	user_chunk_ptr dd ? ;voidp

if PNG_READ_USER_CHUNKS_SUPPORTED eq 1

	read_user_chunk_fn dd ? ;png_user_chunk_ptr ;user read chunk handler

end if

end if

	unknown_default dd ? ;int          ; As PNG_HANDLE_*

	num_chunk_list  dd ? ;unsigned int ; Number of entries in the list

	chunk_list      dd ? ;bytep        ; List of byte[5]; the textual chunk name

			; followed by a PNG_HANDLE_* byte

end if

if PNG_READ_RGB_TO_GRAY_SUPPORTED eq 1

	rgb_to_gray_status db ? ;byte

	; Added in libpng 1.5.5 to record setting of coefficients:

	rgb_to_gray_coefficients_set db ? ;byte

	; These were changed from byte in libpng-1.0.6

	rgb_to_gray_red_coeff   dw ? ;uint_16

	rgb_to_gray_green_coeff dw ? ;uint_16

	; deleted in 1.5.5: rgb_to_gray_blue_coeff;

	rb 2 ;align

end if

; New member added in libpng-1.0.4 (renamed in 1.0.9)

; Changed from byte to uint_32 at version 1.2.0

	mng_features_permitted dd ? ;uint_32

	filter_type db ? ;byte

	rb 3 ;align

end if

if PNG_USER_MEM_SUPPORTED eq 1

	mem_ptr   dd ? ;voidp      ;user supplied struct for mem functions

	malloc_fn dd ? ;malloc_ptr ;function for allocating memory

	free_fn   dd ? ;free_ptr   ;function for freeing memory

end if

	big_row_buf dd ? ;bytep ;buffer to save current (unfiltered) row

; The following three members were added at version 1.0.14 and 1.2.4

	quantize_sort    dd ? ;bytep ;working sort array

	index_to_palette dd ? ;bytep ;where the original index currently is in the palette

	palette_to_index dd ? ;bytep ;which original index points to this palette color

end if

	compression_type db ? ;byte

	rb 3 ;align

	user_width_max dd ? ;uint_32

	user_height_max dd ? ;uint_32

	; chunks that can be stored (0 means unlimited).

	; can occupy when decompressed.  0 means unlimited.

end if

if PNG_READ_UNKNOWN_CHUNKS_SUPPORTED eq 1

	; Temporary storage for unknown chunk that the library doesn't recognize,

	; used while reading the chunk.

	rb 3 ;align

end if

	old_big_row_buf_size dd ? ;png_size_t

; New member added in libpng-1.2.30

	read_buffer dd ? ;bytep ;buffer for reading chunk data

	read_buffer_size dd ? ;png_alloc_size_t ;current size of the buffer

end if

if PNG_SEQUENTIAL_READ_SUPPORTED eq 1

	IDAT_read_size dd ? ;uInt ;limit on read buffer size for IDAT

end if

; New member added in libpng-1.4.0

	io_state dd ? ;uint_32

end if

	big_prev_row dd ? ;bytep

	read_filter rd PNG_FILTER_VALUE_LAST-1

if (PNG_COLORSPACE_SUPPORTED eq 1) | (PNG_GAMMA_SUPPORTED eq 1)

	colorspace png_colorspace

end if

end if

ends