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