910 lines
25 KiB
NASM
910 lines
25 KiB
NASM
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; pngtrans.asm - transforms the data in a row (used by both readers and writers)
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; Last changed in libpng 1.6.24 [August 4, 2016]
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; Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
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; (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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; (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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; This code is released under the libpng license.
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; For conditions of distribution and use, see the disclaimer
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; and license in png.inc
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if (PNG_READ_SUPPORTED eq 1) | (PNG_WRITE_SUPPORTED eq 1)
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; Turn on BGR-to-RGB mapping
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;void (png_structrp png_ptr)
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align 4
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proc png_set_bgr uses edi, png_ptr:dword
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png_debug 1, 'in png_set_bgr'
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mov edi,[png_ptr]
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test edi,edi
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jz @f ;if (..==0) return
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or dword[edi+png_struct.transformations], PNG_BGR
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@@:
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ret
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endp
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; Turn on 16-bit byte swapping
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;void (png_structrp png_ptr)
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align 4
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proc png_set_swap uses edi, png_ptr:dword
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png_debug 1, 'in png_set_swap'
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mov edi,[png_ptr]
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test edi,edi
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jz @f ;if (..==0) return
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cmp byte[edi+png_struct.bit_depth],16
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jne @f ;if (..==..)
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or dword[edi+png_struct.transformations], PNG_SWAP_BYTES
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@@:
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ret
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endp
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; Turn on pixel packing
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;void (png_structrp png_ptr)
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align 4
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proc png_set_packing uses edi, png_ptr:dword
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png_debug 1, 'in png_set_packing'
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mov edi,[png_ptr]
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test edi,edi
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jz @f ;if (..==0) return
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cmp byte[edi+png_struct.bit_depth],8
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jge @f ;if (..<..)
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or dword[edi+png_struct.transformations], PNG_PACK
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if PNG_WRITE_SUPPORTED eq 1
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mov byte[edi+png_struct.usr_bit_depth],8
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end if
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@@:
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ret
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endp
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; Turn on packed pixel swapping
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;void (png_structrp png_ptr)
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align 4
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proc png_set_packswap uses edi, png_ptr:dword
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png_debug 1, 'in png_set_packswap'
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mov edi,[png_ptr]
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test edi,edi
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jz @f ;if (..==0) return
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cmp byte[edi+png_struct.bit_depth],8
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jge @f ;if (..<..)
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or dword[edi+png_struct.transformations], PNG_PACKSWAP
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@@:
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ret
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endp
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;void (png_structrp png_ptr, png_color_8p true_bits)
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align 4
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proc png_set_shift uses ecx edi, png_ptr:dword, true_bits:dword
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png_debug 1, 'in png_set_shift'
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mov edi,[png_ptr]
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test edi,edi
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jz @f ;if (..==0) return
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or dword[edi+png_struct.transformations], PNG_SHIFT
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mov ecx,sizeof.png_color_8
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mov edi,[edi+png_struct.shift]
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mov esi,[true_bits]
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rep movsb
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@@:
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ret
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endp
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;int (png_structrp png_ptr)
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align 4
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proc png_set_interlace_handling uses edi, png_ptr:dword
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png_debug 1, 'in png_set_interlace handling'
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mov edi,[png_ptr]
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test edi,edi
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jz @f
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cmp byte[edi+png_struct.interlaced],0
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je @f ;if(..!=0 && ..!=0)
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or dword[edi+png_struct.transformations], PNG_INTERLACE
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mov eax,7
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jmp .end_f
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@@:
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xor eax,eax
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inc eax
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.end_f:
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ret
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endp
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; Add a filler byte on read, or remove a filler or alpha byte on write.
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; The filler type has changed in v0.95 to allow future 2-byte fillers
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; for 48-bit input data, as well as to avoid problems with some compilers
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; that don't like bytes as parameters.
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;void (png_structrp png_ptr, uint_32 filler, int filler_loc)
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align 4
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proc png_set_filler uses eax edi, png_ptr:dword, filler:dword, filler_loc:dword
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png_debug 1, 'in png_set_filler'
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mov edi,[png_ptr]
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test edi,edi
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jz .end_f ;if (..==0) return
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; In libpng 1.6 it is possible to determine whether this is a read or write
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; operation and therefore to do more checking here for a valid call.
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mov eax,[edi+png_struct.mode]
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and eax,PNG_IS_READ_STRUCT
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jz @f ;if (..!=0)
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if PNG_READ_FILLER_SUPPORTED eq 1
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; On read png_set_filler is always valid, regardless of the base PNG
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; format, because other transformations can give a format where the
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; filler code can execute (basically an 8 or 16-bit component RGB or G
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; format.)
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; NOTE: usr_channels is not used by the read code! (This has led to
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; confusion in the past.) The filler is only used in the read code.
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mov eax,[filler]
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mov [edi+png_struct.filler],ax
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jmp .end0
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else
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cStr ,'png_set_filler not supported on read'
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stdcall png_app_error, edi, eax
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jmp .end_f
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end if
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@@: ;else ;write
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if PNG_WRITE_FILLER_SUPPORTED eq 1
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; On write the usr_channels parameter must be set correctly at the
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; start to record the number of channels in the app-supplied data.
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; switch (png_ptr->color_type)
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; {
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; case PNG_COLOR_TYPE_RGB:
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; png_ptr->usr_channels = 4;
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; break;
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; case PNG_COLOR_TYPE_GRAY:
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; if (png_ptr->bit_depth >= 8)
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; {
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; png_ptr->usr_channels = 2;
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; break;
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; }
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; else
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; {
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; There simply isn't any code in libpng to strip out bits
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; from bytes when the components are less than a byte in
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; size!
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; png_app_error(png_ptr,
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; "png_set_filler is invalid for"
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; " low bit depth gray output");
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; return;
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; }
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; default:
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; png_app_error(png_ptr,
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; "png_set_filler: inappropriate color type");
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; return;
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; }
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else
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cStr ,'png_set_filler not supported on write'
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stdcall png_app_error, edi, eax
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jmp .end_f
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end if
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.end0:
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; Here on success - libpng supports the operation, set the transformation
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; and the flag to say where the filler channel is.
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or dword[edi+png_struct.transformations],PNG_FILLER
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cmp dword[filler_loc],PNG_FILLER_AFTER
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jne @f ;if (..==..)
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or dword[edi+png_struct.flags],PNG_FLAG_FILLER_AFTER
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jmp .end_f
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@@: ;else
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and dword[edi+png_struct.flags],not PNG_FLAG_FILLER_AFTER
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.end_f:
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ret
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endp
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; Added to libpng-1.2.7
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;void (png_structrp png_ptr, uint_32 filler, int filler_loc)
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align 4
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proc png_set_add_alpha uses eax edi, png_ptr:dword, filler:dword, filler_loc:dword
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png_debug 1, 'in png_set_add_alpha'
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mov edi,[png_ptr]
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test edi,edi
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jz .end_f ;if (..==0) return
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stdcall png_set_filler, edi, [filler], [filler_loc]
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; The above may fail to do anything.
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mov eax,[edi+png_struct.transformations]
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and eax,PNG_FILLER
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jz .end_f ;if (..!=0)
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or dword[edi+png_struct.transformations],PNG_ADD_ALPHA
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.end_f:
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ret
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endp
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;void (png_structrp png_ptr)
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align 4
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proc png_set_swap_alpha uses edi, png_ptr:dword
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png_debug 1, 'in png_set_swap_alpha'
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mov edi,[png_ptr]
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test edi,edi
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jz .end_f ;if (..==0) return
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or dword[edi+png_struct.transformations], PNG_SWAP_ALPHA
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.end_f:
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ret
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endp
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;void (png_structrp png_ptr)
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align 4
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proc png_set_invert_alpha uses edi, png_ptr:dword
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png_debug 1, 'in png_set_invert_alpha'
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mov edi,[png_ptr]
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test edi,edi
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jz .end_f ;if (..==0) return
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or dword[edi+png_struct.transformations], PNG_INVERT_ALPHA
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.end_f:
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ret
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endp
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;void (png_structrp png_ptr)
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align 4
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proc png_set_invert_mono uses edi, png_ptr:dword
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png_debug 1, 'in png_set_invert_mono'
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mov edi,[png_ptr]
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test edi,edi
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jz .end_f ;if (..==0) return
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or dword[edi+png_struct.transformations], PNG_INVERT_MONO
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.end_f:
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ret
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endp
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; Invert monochrome grayscale data
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;void (png_row_infop row_info, bytep row)
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align 4
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proc png_do_invert uses eax ebx ecx edx, row_info:dword, row:dword
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;ecx - i
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;eax - rp
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;edx - istop
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png_debug 1, 'in png_do_invert'
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mov ebx,[row_info]
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cmp byte[ebx+png_row_info.color_type],PNG_COLOR_TYPE_GRAY
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jne .end0
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mov eax,[row]
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mov edx,[ebx+png_row_info.rowbytes]
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xor ecx,ecx
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jmp @f
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align 4
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.cycle0:
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inc ecx
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@@:
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cmp ecx,edx
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jae .end_f
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not byte[eax]
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inc eax
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jmp .cycle0
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.end0:
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cmp byte[ebx+png_row_info.color_type],PNG_COLOR_TYPE_GRAY_ALPHA
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jne .end1
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cmp byte[ebx+png_row_info.bit_depth],8
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jne .end1
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mov eax,[row]
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mov edx,[ebx+png_row_info.rowbytes]
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xor ecx,ecx
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jmp @f
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align 4
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.cycle1:
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add ecx,2
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@@:
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cmp ecx,edx
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jae .end_f
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not byte[eax]
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add eax,2
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jmp .cycle1
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.end1:
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if PNG_16BIT_SUPPORTED eq 1
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cmp byte[ebx+png_row_info.color_type],PNG_COLOR_TYPE_GRAY_ALPHA
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jne .end_f
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cmp byte[ebx+png_row_info.bit_depth],16
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jne .end_f
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mov eax,[row]
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mov edx,[ebx+png_row_info.rowbytes]
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xor ecx,ecx
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jmp @f
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align 4
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.cycle2:
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add ecx,4
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@@:
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cmp ecx,edx
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jae .end_f
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not word[eax]
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add eax,4
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jmp .cycle2
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end if
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.end_f:
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ret
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endp
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; Swaps byte order on 16-bit depth images
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;void (png_row_infop row_info, bytep row)
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align 4
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proc png_do_swap, row_info:dword, row:dword
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png_debug 1, 'in png_do_swap'
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; if (row_info->bit_depth == 16)
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; {
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; bytep rp = row;
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; uint_32 i;
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; uint_32 istop= row_info->width * row_info->channels;
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; for (i = 0; i < istop; i++, rp += 2)
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; {
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if PNG_BUILTIN_BSWAP16_SUPPORTED eq 1
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; Feature added to libpng-1.6.11 for testing purposes, not
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; enabled by default.
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; *(uint_16*)rp = __builtin_bswap16(*(uint_16*)rp);
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else
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; byte t = *rp;
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; *rp = *(rp + 1);
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; *(rp + 1) = t;
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end if
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; }
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; }
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ret
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endp
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if (PNG_READ_PACKSWAP_SUPPORTED eq 1) | (PNG_WRITE_PACKSWAP_SUPPORTED eq 1)
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align 4
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onebppswaptable db 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,\
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0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,\
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0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,\
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0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,\
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0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,\
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0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,\
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0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,\
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0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,\
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0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,\
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0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,\
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0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,\
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0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,\
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0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,\
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0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,\
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0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,\
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0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,\
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0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,\
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0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,\
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0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,\
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0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,\
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0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,\
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0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,\
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0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,\
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0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,\
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0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,\
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0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,\
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0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,\
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0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,\
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0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,\
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0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,\
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0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,\
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0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
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align 4
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twobppswaptable db 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,\
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0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,\
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0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,\
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0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,\
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0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,\
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0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,\
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0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,\
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0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,\
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0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,\
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0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,\
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0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,\
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0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,\
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0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,\
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0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,\
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0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,\
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0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,\
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0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,\
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0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,\
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0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,\
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0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,\
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0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,\
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0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,\
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|
0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,\
|
|
0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,\
|
|
0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,\
|
|
0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,\
|
|
0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,\
|
|
0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,\
|
|
0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,\
|
|
0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,\
|
|
0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,\
|
|
0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
|
|
|
|
align 4
|
|
fourbppswaptable db 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,\
|
|
0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,\
|
|
0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,\
|
|
0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,\
|
|
0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,\
|
|
0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,\
|
|
0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,\
|
|
0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,\
|
|
0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,\
|
|
0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,\
|
|
0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,\
|
|
0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,\
|
|
0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,\
|
|
0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,\
|
|
0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,\
|
|
0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,\
|
|
0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,\
|
|
0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,\
|
|
0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,\
|
|
0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,\
|
|
0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,\
|
|
0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,\
|
|
0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,\
|
|
0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,\
|
|
0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,\
|
|
0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,\
|
|
0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,\
|
|
0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,\
|
|
0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,\
|
|
0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,\
|
|
0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,\
|
|
0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
|
|
end if ;PACKSWAP || WRITE_PACKSWAP
|
|
|
|
; Swaps pixel packing order within bytes
|
|
;void (png_row_infop row_info, bytep row)
|
|
align 4
|
|
proc png_do_packswap uses eax edx edi esi, row_info:dword, row:dword
|
|
png_debug 1, 'in png_do_packswap'
|
|
|
|
mov eax,[row_info]
|
|
cmp byte[eax+png_row_info.bit_depth],8
|
|
jge .end_f ;if (..<..)
|
|
;edi = rp
|
|
;esi = table
|
|
|
|
mov edx,[eax+png_row_info.rowbytes]
|
|
mov edi,[row]
|
|
add edx,edi
|
|
|
|
cmp byte[eax+png_row_info.bit_depth],1
|
|
jne @f ;if (..==..)
|
|
mov esi,onebppswaptable
|
|
jmp .cycle0
|
|
@@:
|
|
cmp byte[eax+png_row_info.bit_depth],2
|
|
jne @f ;else if (..==..)
|
|
mov esi,twobppswaptable
|
|
jmp .cycle0
|
|
@@:
|
|
cmp byte[eax+png_row_info.bit_depth],4
|
|
jne .end_f ;else if (..==..)
|
|
mov esi,fourbppswaptable
|
|
align 4
|
|
.cycle0: ;for (..=..;..<..;..)
|
|
cmp edi,edx
|
|
jge .end_f
|
|
movzx eax,byte[edi]
|
|
mov al,byte[esi+eax]
|
|
stosb ;*rp = table[*rp]
|
|
jmp .cycle0
|
|
.end_f:
|
|
ret
|
|
endp
|
|
|
|
; Remove a channel - this used to be 'png_do_strip_filler' but it used a
|
|
; somewhat weird combination of flags to determine what to do. All the calls
|
|
; to png_do_strip_filler are changed in 1.5.2 to call this instead with the
|
|
; correct arguments.
|
|
|
|
; The routine isn't general - the channel must be the channel at the start or
|
|
; end (not in the middle) of each pixel.
|
|
|
|
;void (png_row_infop row_info, bytep row, int at_start)
|
|
align 4
|
|
proc png_do_strip_channel, row_info:dword, row:dword, at_start:dword
|
|
; bytep sp = row; /* source pointer */
|
|
; bytep dp = row; /* destination pointer */
|
|
; bytep ep = row + row_info->rowbytes; /* One beyond end of row */
|
|
|
|
; At the start sp will point to the first byte to copy and dp to where
|
|
; it is copied to. ep always points just beyond the end of the row, so
|
|
; the loop simply copies (channels-1) channels until sp reaches ep.
|
|
|
|
; at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.
|
|
; nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.
|
|
|
|
|
|
; GA, GX, XG cases
|
|
; if (row_info->channels == 2)
|
|
; {
|
|
; if (row_info->bit_depth == 8)
|
|
; {
|
|
; if (at_start != 0) /* Skip initial filler */
|
|
; ++sp;
|
|
; else /* Skip initial channel and, for sp, the filler */
|
|
; sp += 2, ++dp;
|
|
|
|
; For a 1 pixel wide image there is nothing to do
|
|
; while (sp < ep)
|
|
; *dp++ = *sp, sp += 2;
|
|
|
|
; row_info->pixel_depth = 8;
|
|
; }
|
|
|
|
; else if (row_info->bit_depth == 16)
|
|
; {
|
|
; if (at_start != 0) /* Skip initial filler */
|
|
; sp += 2;
|
|
; else /* Skip initial channel and, for sp, the filler */
|
|
; sp += 4, dp += 2;
|
|
|
|
; while (sp < ep)
|
|
; *dp++ = *sp++, *dp++ = *sp, sp += 3;
|
|
|
|
; row_info->pixel_depth = 16;
|
|
; }
|
|
|
|
; else
|
|
; return; /* bad bit depth */
|
|
|
|
; row_info->channels = 1;
|
|
|
|
; Finally fix the color type if it records an alpha channel
|
|
; if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
|
|
; row_info->color_type = PNG_COLOR_TYPE_GRAY;
|
|
; }
|
|
|
|
; RGBA, RGBX, XRGB cases
|
|
; else if (row_info->channels == 4)
|
|
; {
|
|
; if (row_info->bit_depth == 8)
|
|
; {
|
|
; if (at_start != 0) /* Skip initial filler */
|
|
; ++sp;
|
|
; else /* Skip initial channels and, for sp, the filler */
|
|
; sp += 4, dp += 3;
|
|
|
|
; Note that the loop adds 3 to dp and 4 to sp each time.
|
|
; while (sp < ep)
|
|
; *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2;
|
|
|
|
; row_info->pixel_depth = 24;
|
|
; }
|
|
|
|
; else if (row_info->bit_depth == 16)
|
|
; {
|
|
; if (at_start != 0) /* Skip initial filler */
|
|
; sp += 2;
|
|
; else /* Skip initial channels and, for sp, the filler */
|
|
; sp += 8, dp += 6;
|
|
|
|
; while (sp < ep)
|
|
; {
|
|
; /* Copy 6 bytes, skip 2 */
|
|
; *dp++ = *sp++, *dp++ = *sp++;
|
|
; *dp++ = *sp++, *dp++ = *sp++;
|
|
; *dp++ = *sp++, *dp++ = *sp, sp += 3;
|
|
; }
|
|
|
|
; row_info->pixel_depth = 48;
|
|
; }
|
|
|
|
; else
|
|
; return; /* bad bit depth */
|
|
|
|
; row_info->channels = 3;
|
|
|
|
; Finally fix the color type if it records an alpha channel
|
|
; if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
|
; row_info->color_type = PNG_COLOR_TYPE_RGB;
|
|
; }
|
|
|
|
; else
|
|
; return; /* The filler channel has gone already */
|
|
|
|
; Fix the rowbytes value.
|
|
; row_info->rowbytes = dp-row;
|
|
ret
|
|
endp
|
|
|
|
; Swaps red and blue bytes within a pixel
|
|
;void (png_row_infop row_info, bytep row)
|
|
align 4
|
|
proc png_do_bgr, row_info:dword, row:dword
|
|
png_debug 1, 'in png_do_bgr'
|
|
;ebx - rp
|
|
;ecx - i
|
|
;esi - row_width
|
|
pushad
|
|
mov edi,[row_info]
|
|
movzx eax,byte[edi+png_row_info.color_type]
|
|
and eax,PNG_COLOR_MASK_COLOR
|
|
je .end_f
|
|
mov esi,[edi+png_row_info.width]
|
|
cmp byte[edi+png_row_info.bit_depth],8
|
|
jne .end0
|
|
cmp byte[edi+png_row_info.color_type],PNG_COLOR_TYPE_RGB
|
|
jne .end1
|
|
xor ecx,ecx
|
|
mov ebx,[row]
|
|
jmp @f
|
|
align 4
|
|
.cycle0:
|
|
inc ecx
|
|
add ebx,3
|
|
@@:
|
|
cmp ecx,esi
|
|
jae .end_f
|
|
mov dl,[ebx]
|
|
mov al,[ebx+2]
|
|
mov [ebx],al
|
|
mov [ebx+2],dl
|
|
jmp .cycle0
|
|
.end1:
|
|
cmp byte[edi+png_row_info.color_type],PNG_COLOR_TYPE_RGB_ALPHA
|
|
jne .end_f
|
|
xor ecx,ecx
|
|
mov ebx,[row]
|
|
jmp @f
|
|
align 4
|
|
.cycle1:
|
|
inc ecx
|
|
add ebx,4
|
|
@@:
|
|
cmp ecx,esi
|
|
jae .end_f
|
|
mov dl,[ebx]
|
|
mov al,[ebx+2]
|
|
mov [ebx],al
|
|
mov [ebx+2],dl
|
|
jmp .cycle1
|
|
.end0:
|
|
if PNG_16BIT_SUPPORTED eq 1
|
|
cmp byte[edi+png_row_info.bit_depth],16
|
|
jne .end_f
|
|
cmp byte[edi+png_row_info.color_type],PNG_COLOR_TYPE_RGB
|
|
jne .end2
|
|
xor ecx,ecx
|
|
mov ebx,[row]
|
|
jmp @f
|
|
align 4
|
|
.cycle2:
|
|
inc ecx
|
|
add ebx,6
|
|
@@:
|
|
cmp ecx,esi
|
|
jae .end_f
|
|
mov dx,[ebx]
|
|
mov ax,[ebx+4]
|
|
mov [ebx],ax
|
|
mov [ebx+4],dx
|
|
jmp .cycle2
|
|
.end2:
|
|
cmp byte[edi+png_row_info.color_type],PNG_COLOR_TYPE_RGB_ALPHA
|
|
jne .end_f
|
|
xor ecx,ecx
|
|
mov ebx,[row]
|
|
jmp @f
|
|
align 4
|
|
.cycle3:
|
|
inc ecx
|
|
add ebx,8
|
|
@@:
|
|
cmp ecx,esi
|
|
jae .end_f
|
|
mov dx,[ebx]
|
|
mov ax,[ebx+4]
|
|
mov [ebx],ax
|
|
mov [ebx+4],dx
|
|
jmp .cycle3
|
|
end if
|
|
.end_f:
|
|
popad
|
|
ret
|
|
endp
|
|
|
|
; Added at libpng-1.5.10
|
|
;void (png_structrp png_ptr, png_row_infop row_info)
|
|
align 4
|
|
proc png_do_check_palette_indexes, png_ptr:dword, row_info:dword
|
|
; if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
|
|
; png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
|
|
; {
|
|
; Calculations moved outside switch in an attempt to stop different
|
|
; compiler warnings. 'padding' is in *bits* within the last byte, it is
|
|
; an 'int' because pixel_depth becomes an 'int' in the expression below,
|
|
; and this calculation is used because it avoids warnings that other
|
|
; forms produced on either GCC or MSVC.
|
|
|
|
; int padding = (-row_info->pixel_depth * row_info->width) & 7;
|
|
; bytep rp = png_ptr->row_buf + row_info->rowbytes;
|
|
|
|
; switch (row_info->bit_depth)
|
|
; {
|
|
; case 1:
|
|
; {
|
|
; /* in this case, all bytes must be 0 so we don't need
|
|
; to unpack the pixels except for the rightmost one.
|
|
|
|
; for (; rp > png_ptr->row_buf; rp--)
|
|
; {
|
|
; if ((*rp >> padding) != 0)
|
|
; png_ptr->num_palette_max = 1;
|
|
; padding = 0;
|
|
; }
|
|
|
|
; break;
|
|
; }
|
|
|
|
; case 2:
|
|
; {
|
|
; for (; rp > png_ptr->row_buf; rp--)
|
|
; {
|
|
; int i = ((*rp >> padding) & 0x03);
|
|
|
|
; if (i > png_ptr->num_palette_max)
|
|
; png_ptr->num_palette_max = i;
|
|
|
|
; i = (((*rp >> padding) >> 2) & 0x03);
|
|
|
|
; if (i > png_ptr->num_palette_max)
|
|
; png_ptr->num_palette_max = i;
|
|
|
|
; i = (((*rp >> padding) >> 4) & 0x03);
|
|
|
|
; if (i > png_ptr->num_palette_max)
|
|
; png_ptr->num_palette_max = i;
|
|
|
|
; i = (((*rp >> padding) >> 6) & 0x03);
|
|
|
|
; if (i > png_ptr->num_palette_max)
|
|
; png_ptr->num_palette_max = i;
|
|
|
|
; padding = 0;
|
|
; }
|
|
|
|
; break;
|
|
; }
|
|
|
|
; case 4:
|
|
; {
|
|
; for (; rp > png_ptr->row_buf; rp--)
|
|
; {
|
|
; int i = ((*rp >> padding) & 0x0f);
|
|
|
|
; if (i > png_ptr->num_palette_max)
|
|
; png_ptr->num_palette_max = i;
|
|
|
|
; i = (((*rp >> padding) >> 4) & 0x0f);
|
|
|
|
; if (i > png_ptr->num_palette_max)
|
|
; png_ptr->num_palette_max = i;
|
|
|
|
; padding = 0;
|
|
; }
|
|
|
|
; break;
|
|
; }
|
|
|
|
; case 8:
|
|
; {
|
|
; for (; rp > png_ptr->row_buf; rp--)
|
|
; {
|
|
; if (*rp > png_ptr->num_palette_max)
|
|
; png_ptr->num_palette_max = (int) *rp;
|
|
; }
|
|
|
|
; break;
|
|
; }
|
|
|
|
; default:
|
|
; break;
|
|
; }
|
|
; }
|
|
ret
|
|
endp
|
|
|
|
;void (png_structrp png_ptr, voidp user_transform_ptr, int user_transform_depth, int user_transform_channels)
|
|
align 4
|
|
proc png_set_user_transform_info uses eax edi, png_ptr:dword, user_transform_ptr:dword, user_transform_depth:dword, user_transform_channels:dword
|
|
png_debug 1, 'in png_set_user_transform_info'
|
|
|
|
mov edi,[png_ptr]
|
|
test edi,edi
|
|
jz .end_f
|
|
|
|
if PNG_READ_USER_TRANSFORM_SUPPORTED eq 1
|
|
mov eax,[edi+png_struct.mode]
|
|
and eax,PNG_IS_READ_STRUCT
|
|
jz @f
|
|
mov eax,[edi+png_struct.flags]
|
|
and eax,PNG_FLAG_ROW_INIT
|
|
jz @f ;if (..!=0 && ..!=0)
|
|
cStr ,'info change after png_start_read_image or png_read_update_info'
|
|
stdcall png_app_error, edi, eax
|
|
jmp .end_f
|
|
@@:
|
|
end if
|
|
|
|
mov eax,[user_transform_ptr]
|
|
mov [edi+png_struct.user_transform_ptr],eax
|
|
mov eax,[user_transform_depth]
|
|
mov [edi+png_struct.user_transform_depth],al
|
|
mov eax,[user_transform_channels]
|
|
mov [edi+png_struct.user_transform_channels],al
|
|
.end_f:
|
|
ret
|
|
endp
|
|
|
|
; This function returns a pointer to the user_transform_ptr associated with
|
|
; the user transform functions. The application should free any memory
|
|
; associated with this pointer before png_write_destroy and png_read_destroy
|
|
; are called.
|
|
|
|
;voidp (png_structrp png_ptr)
|
|
align 4
|
|
proc png_get_user_transform_ptr, png_ptr:dword
|
|
mov eax,[png_ptr]
|
|
cmp eax,0
|
|
je @f
|
|
mov eax,[eax+png_struct.user_transform_ptr]
|
|
@@:
|
|
ret
|
|
endp
|
|
|
|
;uint_32 (png_structrp png_ptr)
|
|
align 4
|
|
proc png_get_current_row_number, png_ptr:dword
|
|
; See the comments in png.inc - this is the sub-image row when reading an
|
|
; interlaced image.
|
|
|
|
mov eax,[png_ptr]
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
mov eax,[eax+png_struct.row_number]
|
|
jmp .end_f
|
|
@@:
|
|
mov eax,PNG_UINT_32_MAX ;help the app not to fail silently
|
|
.end_f:
|
|
ret
|
|
endp
|
|
|
|
;byte (png_structrp png_ptr)
|
|
align 4
|
|
proc png_get_current_pass_number, png_ptr:dword
|
|
mov eax,[png_ptr]
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
mov eax,[eax+png_struct.pass]
|
|
jmp .end_f
|
|
@@:
|
|
mov eax,8 ;invalid
|
|
.end_f:
|
|
ret
|
|
endp
|
|
end if
|