| 0,0 → 1,306 |
|---|
| ; |
| ; 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 |