2020-12-08 18:40:34 +01:00
|
|
|
;
|
|
|
|
|
; Options
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
PNG_RELEASE_BUILD equ 1
|
|
|
|
|
|
|
|
|
|
;---
|
|
|
|
|
; Various modes of operation. Note that after an init, mode is set to
|
|
|
|
|
; zero automatically when the structure is created. Three of these
|
|
|
|
|
; are defined in png.inc because they need to be visible to applications
|
|
|
|
|
; that call png_set_unknown_chunk().
|
|
|
|
|
|
|
|
|
|
;PNG_HAVE_IHDR 0x01 (defined in png.inc)
|
|
|
|
|
;PNG_HAVE_PLTE 0x02 (defined in png.inc)
|
|
|
|
|
PNG_HAVE_IDAT equ 0x04
|
|
|
|
|
;PNG_AFTER_IDAT 0x08 (defined in png.inc)
|
|
|
|
|
PNG_HAVE_IEND equ 0x10
|
|
|
|
|
;0x20 (unused)
|
|
|
|
|
;0x40 (unused)
|
|
|
|
|
;0x80 (unused)
|
|
|
|
|
PNG_HAVE_CHUNK_HEADER equ 0x100
|
|
|
|
|
PNG_WROTE_tIME equ 0x200
|
|
|
|
|
PNG_WROTE_INFO_BEFORE_PLTE equ 0x400
|
|
|
|
|
PNG_BACKGROUND_IS_GRAY equ 0x800
|
|
|
|
|
PNG_HAVE_PNG_SIGNATURE equ 0x1000
|
|
|
|
|
PNG_HAVE_CHUNK_AFTER_IDAT equ 0x2000 ;Have another chunk after IDAT
|
|
|
|
|
;0x4000 (unused)
|
|
|
|
|
PNG_IS_READ_STRUCT equ 0x8000 ;Else is a write struct
|
|
|
|
|
|
|
|
|
|
; Flags for the transformations the PNG library does on the image data
|
|
|
|
|
PNG_BGR equ 0x0001
|
|
|
|
|
PNG_INTERLACE equ 0x0002
|
|
|
|
|
PNG_PACK equ 0x0004
|
|
|
|
|
PNG_SHIFT equ 0x0008
|
|
|
|
|
PNG_SWAP_BYTES equ 0x0010
|
|
|
|
|
PNG_INVERT_MONO equ 0x0020
|
|
|
|
|
PNG_QUANTIZE equ 0x0040
|
|
|
|
|
PNG_COMPOSE equ 0x0080 ;Was PNG_BACKGROUND
|
|
|
|
|
PNG_BACKGROUND_EXPAND equ 0x0100
|
|
|
|
|
PNG_EXPAND_16 equ 0x0200 ;Added to libpng 1.5.2
|
|
|
|
|
PNG_16_TO_8 equ 0x0400 ;Becomes 'chop' in 1.5.4
|
|
|
|
|
PNG_RGBA equ 0x0800
|
|
|
|
|
PNG_EXPAND equ 0x1000
|
|
|
|
|
PNG_GAMMA equ 0x2000
|
|
|
|
|
PNG_GRAY_TO_RGB equ 0x4000
|
|
|
|
|
PNG_FILLER equ 0x8000
|
|
|
|
|
PNG_PACKSWAP equ 0x10000
|
|
|
|
|
PNG_SWAP_ALPHA equ 0x20000
|
|
|
|
|
PNG_STRIP_ALPHA equ 0x40000
|
|
|
|
|
PNG_INVERT_ALPHA equ 0x80000
|
|
|
|
|
PNG_USER_TRANSFORM equ 0x100000
|
|
|
|
|
PNG_RGB_TO_GRAY_ERR equ 0x200000
|
|
|
|
|
PNG_RGB_TO_GRAY_WARN equ 0x400000
|
|
|
|
|
PNG_RGB_TO_GRAY equ 0x600000 ;two bits, RGB_TO_GRAY_ERR|WARN
|
|
|
|
|
PNG_ENCODE_ALPHA equ 0x800000 ;Added to libpng-1.5.4
|
|
|
|
|
PNG_ADD_ALPHA equ 0x1000000 ;Added to libpng-1.2.7
|
|
|
|
|
PNG_EXPAND_tRNS equ 0x2000000 ;Added to libpng-1.2.9
|
|
|
|
|
PNG_SCALE_16_TO_8 equ 0x4000000 ;Added to libpng-1.5.4
|
|
|
|
|
;0x8000000 unused
|
|
|
|
|
;0x10000000 unused
|
|
|
|
|
;0x20000000 unused
|
|
|
|
|
;0x40000000 unused
|
|
|
|
|
; Flags for png_create_struct
|
|
|
|
|
PNG_STRUCT_PNG equ 0x0001
|
|
|
|
|
PNG_STRUCT_INFO equ 0x0002
|
|
|
|
|
|
|
|
|
|
; Flags for the png_ptr->flags rather than declaring a byte for each one
|
|
|
|
|
PNG_FLAG_ZLIB_CUSTOM_STRATEGY equ 0x0001
|
|
|
|
|
PNG_FLAG_ZSTREAM_INITIALIZED equ 0x0002 ;Added to libpng-1.6.0
|
|
|
|
|
;0x0004 unused
|
|
|
|
|
PNG_FLAG_ZSTREAM_ENDED equ 0x0008 ;Added to libpng-1.6.0
|
|
|
|
|
;0x0010 unused
|
|
|
|
|
;0x0020 unused
|
|
|
|
|
PNG_FLAG_ROW_INIT equ 0x0040
|
|
|
|
|
PNG_FLAG_FILLER_AFTER equ 0x0080
|
|
|
|
|
PNG_FLAG_CRC_ANCILLARY_USE equ 0x0100
|
|
|
|
|
PNG_FLAG_CRC_ANCILLARY_NOWARN equ 0x0200
|
|
|
|
|
PNG_FLAG_CRC_CRITICAL_USE equ 0x0400
|
|
|
|
|
PNG_FLAG_CRC_CRITICAL_IGNORE equ 0x0800
|
|
|
|
|
PNG_FLAG_ASSUME_sRGB equ 0x1000 ;Added to libpng-1.5.4
|
|
|
|
|
PNG_FLAG_OPTIMIZE_ALPHA equ 0x2000 ;Added to libpng-1.5.4
|
|
|
|
|
PNG_FLAG_DETECT_UNINITIALIZED equ 0x4000 ;Added to libpng-1.5.4
|
|
|
|
|
;PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000
|
|
|
|
|
;PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000
|
|
|
|
|
PNG_FLAG_LIBRARY_MISMATCH equ 0x20000
|
|
|
|
|
PNG_FLAG_STRIP_ERROR_NUMBERS equ 0x40000
|
|
|
|
|
PNG_FLAG_STRIP_ERROR_TEXT equ 0x80000
|
|
|
|
|
PNG_FLAG_BENIGN_ERRORS_WARN equ 0x100000 ;Added to libpng-1.4.0
|
|
|
|
|
PNG_FLAG_APP_WARNINGS_WARN equ 0x200000 ;Added to libpng-1.6.0
|
|
|
|
|
PNG_FLAG_APP_ERRORS_WARN equ 0x400000 ;Added to libpng-1.6.0
|
|
|
|
|
|
|
|
|
|
; Gamma values (new at libpng-1.5.4):
|
|
|
|
|
PNG_GAMMA_MAC_OLD equ 151724 ;Assume '1.8' is really 2.2/1.45!
|
|
|
|
|
PNG_GAMMA_MAC_INVERSE equ 65909
|
|
|
|
|
PNG_GAMMA_sRGB_INVERSE equ 45455
|
|
|
|
|
|
|
|
|
|
macro PNG_ROWBYTES pixel_bits, width
|
|
|
|
|
{
|
|
|
|
|
local .end0
|
|
|
|
|
if pixel_bits eq eax
|
|
|
|
|
else
|
|
|
|
|
mov eax,pixel_bits
|
|
|
|
|
end if
|
|
|
|
|
cmp eax,8
|
|
|
|
|
jge .end0
|
|
|
|
|
add eax,7
|
|
|
|
|
.end0:
|
|
|
|
|
shr eax,3
|
|
|
|
|
imul eax,width
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
; In 1.7.0 the definitions will be made public in png.inc to avoid having to
|
|
|
|
|
; duplicate the same definitions in application code.
|
|
|
|
|
|
|
|
|
|
png_IDAT equ 'IDAT'
|
|
|
|
|
png_IEND equ 'IEND'
|
|
|
|
|
png_IHDR equ 'IHDR'
|
|
|
|
|
png_PLTE equ 'PLTE'
|
|
|
|
|
png_bKGD equ 'bKGD'
|
|
|
|
|
png_cHRM equ 'cHRM'
|
|
|
|
|
png_fRAc equ 'fRAc' ;registered, not defined
|
|
|
|
|
png_gAMA equ 'gAMA'
|
|
|
|
|
png_gIFg equ 'gIFg'
|
|
|
|
|
png_gIFt equ 'gIFt' ;deprecated
|
|
|
|
|
png_gIFx equ 'gIFx'
|
|
|
|
|
png_hIST equ 'hIST'
|
|
|
|
|
png_iCCP equ 'iCCP'
|
|
|
|
|
png_iTXt equ 'iTXt'
|
|
|
|
|
png_oFFs equ 'oFFs'
|
|
|
|
|
png_pCAL equ 'pCAL'
|
|
|
|
|
png_pHYs equ 'pHYs'
|
|
|
|
|
png_sBIT equ 'sBIT'
|
|
|
|
|
png_sCAL equ 'sCAL'
|
|
|
|
|
png_sPLT equ 'sPLT'
|
|
|
|
|
png_sRGB equ 'sRGB'
|
|
|
|
|
png_sTER equ 'sTER'
|
|
|
|
|
png_tEXt equ 'tEXt'
|
|
|
|
|
png_tIME equ 'tIME'
|
|
|
|
|
png_tRNS equ 'tRNS'
|
|
|
|
|
png_zTXt equ 'zTXt'
|
|
|
|
|
|
|
|
|
|
;Test on flag values as defined in the spec (section 5.4):
|
|
|
|
|
macro PNG_CHUNK_ANCILLARY c
|
|
|
|
|
{
|
|
|
|
|
mov eax,c
|
|
|
|
|
shr eax,29
|
|
|
|
|
and eax,1
|
|
|
|
|
}
|
|
|
|
|
macro PNG_CHUNK_CRITICAL c
|
|
|
|
|
{
|
|
|
|
|
PNG_CHUNK_ANCILLARY c
|
|
|
|
|
xor eax,1
|
|
|
|
|
}
|
|
|
|
|
macro PNG_CHUNK_PRIVATE c
|
|
|
|
|
{
|
|
|
|
|
mov eax,c
|
|
|
|
|
shr eax,21
|
|
|
|
|
and eax,1
|
|
|
|
|
}
|
|
|
|
|
macro PNG_CHUNK_RESERVED c
|
|
|
|
|
{
|
|
|
|
|
mov eax,c
|
|
|
|
|
shr eax,13
|
|
|
|
|
and eax,1
|
|
|
|
|
}
|
|
|
|
|
macro PNG_CHUNK_SAFE_TO_COPY c
|
|
|
|
|
{
|
|
|
|
|
mov eax,c
|
|
|
|
|
shr eax,5
|
|
|
|
|
and eax,1
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
PNG_FLAG_CRC_ANCILLARY_MASK equ (PNG_FLAG_CRC_ANCILLARY_USE or PNG_FLAG_CRC_ANCILLARY_NOWARN)
|
|
|
|
|
PNG_FLAG_CRC_CRITICAL_MASK equ (PNG_FLAG_CRC_CRITICAL_USE or PNG_FLAG_CRC_CRITICAL_IGNORE)
|
|
|
|
|
PNG_FLAG_CRC_MASK equ (PNG_FLAG_CRC_ANCILLARY_MASK or PNG_FLAG_CRC_CRITICAL_MASK)
|
|
|
|
|
|
|
|
|
|
macro PNG_sRGB_FROM_LINEAR linear
|
|
|
|
|
{
|
|
|
|
|
mov eax,linear
|
|
|
|
|
shr eax,15
|
|
|
|
|
shl eax,1
|
|
|
|
|
add eax,png_sRGB_base
|
|
|
|
|
movzx eax,word[eax]
|
|
|
|
|
push ebx ecx
|
|
|
|
|
mov ebx,linear
|
|
|
|
|
shr ebx,15
|
|
|
|
|
add ebx,png_sRGB_delta
|
|
|
|
|
mov ecx,linear
|
|
|
|
|
and ecx,0x7fff
|
|
|
|
|
imul ecx,ebx
|
|
|
|
|
shr ecx,12
|
|
|
|
|
add eax,ecx
|
|
|
|
|
pop ecx ebx
|
|
|
|
|
shr eax,8
|
|
|
|
|
;;;and eax,0xff
|
|
|
|
|
}
|
|
|
|
|
; Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
|
|
|
|
|
; encoded value with maximum error 0.646365. Note that the input is not a
|
|
|
|
|
; 16-bit value; it has been multiplied by 255!
|
|
|
|
|
|
|
|
|
|
PNG_UNEXPECTED_ZLIB_RETURN equ (-7)
|
|
|
|
|
|
|
|
|
|
;...
|
|
|
|
|
|
|
|
|
|
; Suggested size for a number buffer (enough for 64 bits and a sign!)
|
|
|
|
|
PNG_NUMBER_BUFFER_SIZE equ 24
|
|
|
|
|
|
|
|
|
|
; These are the integer formats currently supported, the name is formed from
|
|
|
|
|
; the standard printf(3) format string.
|
|
|
|
|
|
|
|
|
|
PNG_NUMBER_FORMAT_u equ 1 ;chose unsigned API!
|
|
|
|
|
PNG_NUMBER_FORMAT_02u equ 2
|
|
|
|
|
PNG_NUMBER_FORMAT_d equ 1 ;chose signed API!
|
|
|
|
|
PNG_NUMBER_FORMAT_02d equ 2
|
|
|
|
|
PNG_NUMBER_FORMAT_x equ 3
|
|
|
|
|
PNG_NUMBER_FORMAT_02x equ 4
|
|
|
|
|
PNG_NUMBER_FORMAT_fixed equ 5 ;choose the signed API
|
|
|
|
|
|
|
|
|
|
; New defines and members adding in libpng-1.5.4
|
|
|
|
|
PNG_WARNING_PARAMETER_SIZE equ 32
|
|
|
|
|
PNG_WARNING_PARAMETER_COUNT equ 8 ;Maximum 9; see pngerror.asm
|
|
|
|
|
|
|
|
|
|
PNG_CHUNK_WARNING equ 0 ;never an error
|
|
|
|
|
PNG_CHUNK_WRITE_ERROR equ 1 ;an error only on write
|
|
|
|
|
PNG_CHUNK_ERROR equ 2 ;always an error
|
|
|
|
|
|
|
|
|
|
; ASCII to FP interfaces, currently only implemented if sCAL
|
|
|
|
|
; support is required.
|
|
|
|
|
|
|
|
|
|
; MAX_DIGITS is actually the maximum number of characters in an sCAL
|
|
|
|
|
; width or height, derived from the precision (number of significant
|
|
|
|
|
; digits - a build time settable option) and assumptions about the
|
|
|
|
|
; maximum ridiculous exponent.
|
|
|
|
|
|
|
|
|
|
PNG_sCAL_MAX_DIGITS equ PNG_sCAL_PRECISION+1+1+10 ;. E exponent
|
|
|
|
|
|
|
|
|
|
; An internal API to validate the format of a floating point number.
|
|
|
|
|
; The result is the index of the next character. If the number is
|
|
|
|
|
; not valid it will be the index of a character in the supposed number.
|
|
|
|
|
|
|
|
|
|
; The format of a number is defined in the PNG extensions specification
|
|
|
|
|
; and this API is strictly conformant to that spec, not anyone elses!
|
|
|
|
|
|
|
|
|
|
; The format as a regular expression is:
|
|
|
|
|
|
|
|
|
|
; [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
|
|
|
|
|
|
|
|
|
|
; or:
|
|
|
|
|
|
|
|
|
|
; [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
|
|
|
|
|
|
|
|
|
|
; The complexity is that either integer or fraction must be present and the
|
|
|
|
|
; fraction is permitted to have no digits only if the integer is present.
|
|
|
|
|
|
|
|
|
|
; NOTE: The dangling E problem.
|
|
|
|
|
; There is a PNG valid floating point number in the following:
|
|
|
|
|
|
|
|
|
|
; PNG floating point numbers are not greedy.
|
|
|
|
|
|
|
|
|
|
; Working this out requires *TWO* character lookahead (because of the
|
|
|
|
|
; sign), the parser does not do this - it will fail at the 'r' - this
|
|
|
|
|
; doesn't matter for PNG sCAL chunk values, but it requires more care
|
|
|
|
|
; if the value were ever to be embedded in something more complex. Use
|
|
|
|
|
; ANSI-C strtod if you need the lookahead.
|
|
|
|
|
|
|
|
|
|
; State table for the parser.
|
|
|
|
|
PNG_FP_INTEGER equ 0 ;before or in integer
|
|
|
|
|
PNG_FP_FRACTION equ 1 ;before or in fraction
|
|
|
|
|
PNG_FP_EXPONENT equ 2 ;before or in exponent
|
|
|
|
|
PNG_FP_STATE equ 3 ;mask for the above
|
|
|
|
|
PNG_FP_SAW_SIGN equ 4 ;Saw +/- in current state
|
|
|
|
|
PNG_FP_SAW_DIGIT equ 8 ;Saw a digit in current state
|
|
|
|
|
PNG_FP_SAW_DOT equ 16 ;Saw a dot in current state
|
|
|
|
|
PNG_FP_SAW_E equ 32 ;Saw an E (or e) in current state
|
|
|
|
|
PNG_FP_SAW_ANY equ 60 ;Saw any of the above 4
|
|
|
|
|
|
|
|
|
|
; These three values don't affect the parser. They are set but not used.
|
|
|
|
|
|
|
|
|
|
PNG_FP_WAS_VALID equ 64 ;Preceding substring is a valid fp number
|
|
|
|
|
PNG_FP_NEGATIVE equ 128 ;A negative number, including "-0"
|
|
|
|
|
PNG_FP_NONZERO equ 256 ;A non-zero value
|
|
|
|
|
PNG_FP_STICKY equ 448 ;The above three flags
|
|
|
|
|
|
|
|
|
|
; This is available for the caller to store in 'state' if required. Do not
|
|
|
|
|
; call the parser after setting it (the parser sometimes clears it.)
|
|
|
|
|
|
|
|
|
|
PNG_FP_INVALID equ 512 ;Available for callers as a distinct value
|
|
|
|
|
|
|
|
|
|
; Result codes for the parser (boolean - true meants ok, false means
|
|
|
|
|
; not ok yet.)
|
|
|
|
|
|
|
|
|
|
PNG_FP_MAYBE equ 0 ;The number may be valid in the future
|
|
|
|
|
PNG_FP_OK equ 1 ;The number is valid
|
|
|
|
|
|
|
|
|
|
; The internal structure that png_image::opaque points to.
|
|
|
|
|
struct png_control
|
|
|
|
|
png_ptr dd ? ;png_structp
|
|
|
|
|
info_ptr dd ? ;png_infop
|
|
|
|
|
error_buf dd ? ;voidp ;Always a jmp_buf at present.
|
|
|
|
|
|
|
|
|
|
memory dd ? ;bytep ;Memory buffer.
|
|
|
|
|
size dd ? ;png_size_t ;Size of the memory buffer.
|
|
|
|
|
|
|
|
|
|
for_write dd ? ;uint ;:1;Otherwise it is a read structure
|
|
|
|
|
owned_file dd ? ;uint ;:1;We own the file in io_ptr
|
|
|
|
|
ends
|
