forked from KolibriOS/kolibrios
285 lines
9.2 KiB
NASM
285 lines
9.2 KiB
NASM
;;================================================================================================;;
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;;//// pcx.asm //// (c) dunkaist, 2010,2012 //////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;; ;;
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;; This file is part of Common development libraries (Libs-Dev). ;;
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;; ;;
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;; Libs-Dev is free software: you can redistribute it and/or modify it under the terms of the GNU ;;
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;; Lesser General Public License as published by the Free Software Foundation, either version 2.1 ;;
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;; of the License, or (at your option) any later version. ;;
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;; ;;
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;; Libs-Dev is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without ;;
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;; even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ;;
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;; Lesser General Public License for more details. ;;
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;; ;;
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;; You should have received a copy of the GNU Lesser General Public License along with Libs-Dev. ;;
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;; If not, see <http://www.gnu.org/licenses/>. ;;
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;; ;;
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;;================================================================================================;;
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include 'pcx.inc'
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;include '../../../../system/board/trunk/debug.inc'
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;;================================================================================================;;
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proc img.is.pcx _data, _length ;//////////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Determine if raw data could be decoded (is in pcx format) ;;
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;;------------------------------------------------------------------------------------------------;;
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;> _data = raw data as read from file/stream ;;
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;> _length = data length ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = false / true ;;
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;;================================================================================================;;
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push ecx edi
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xor eax, eax
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mov edi, [_data]
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cmp byte[edi + pcx_header.magic_number], 0x0A
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jne .is_not_pcx
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cmp byte[edi + pcx_header.version], 5
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jne .is_not_pcx
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cmp byte[edi + pcx_header.encoding], 1
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jne .is_not_pcx
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cmp byte[edi + pcx_header.reserved], 0
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jne .is_not_pcx
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add edi, pcx_header.filler
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xor al, al
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mov ecx, 58
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cld
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repe scasb
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test ecx, ecx
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jnz .is_not_pcx
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.is_pcx:
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inc eax
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.is_not_pcx:
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pop edi ecx
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ret
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endp
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;;================================================================================================;;
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proc img.decode.pcx _data, _length, _options ;////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Decode data into image if it contains correctly formed raw data in pcx format ;;
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;;------------------------------------------------------------------------------------------------;;
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;> _data = raw data as read from file/stream ;;
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;> _length = data length ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = 0 (error) or pointer to image ;;
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;;================================================================================================;;
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locals
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nplanes rd 1
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xsize rd 1
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ysize rd 1
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bpl rd 1
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total_bpl rd 1
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line_begin rd 1
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retvalue rd 1 ; 0 (error) or pointer to image
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endl
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pusha
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mov esi, [_data]
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movzx eax, byte[esi + pcx_header.nplanes]
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mov [nplanes], eax
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movzx ebx, word[esi + pcx_header.bpl]
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mov [bpl], ebx
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imul eax, ebx
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mov [total_bpl], eax
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movzx eax, word[esi + pcx_header.xmax]
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sub ax, word[esi + pcx_header.xmin]
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inc eax
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mov [xsize], eax
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movzx ebx, word[esi + pcx_header.ymax]
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sub bx, word[esi + pcx_header.ymin]
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inc ebx
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mov [ysize], ebx
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cmp [esi + pcx_header.bpp], 1
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jz .monochrome
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cmp byte[esi + pcx_header.nplanes], 3
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jnz .indexed
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.24bit:
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stdcall img.create, eax, ebx, Image.bpp24
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mov [retvalue], eax
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test eax, eax
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jz .quit
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mov esi, [_data]
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add esi, 128 ; skip header
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mov edi, [eax + Image.Data]
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add edi, 2
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mov [line_begin], edi
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.24bit.scanline:
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mov ebx, [total_bpl]
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.24bit.color_line:
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mov edx, [bpl]
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.24bit.next_byte:
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call pcx._.get_byte
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sub edx, ecx
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@@:
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mov [edi], al
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add edi, [nplanes]
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dec ecx
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jnz @b
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test edx, edx
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jnz .24bit.next_byte
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.24bit.end_color_line:
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test ebx, ebx
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jz .24bit.end_full_line
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dec [line_begin]
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mov edi, [line_begin]
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jmp .24bit.color_line
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.24bit.end_full_line:
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dec [ysize]
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jz .quit
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add edi, 2
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bt [xsize], 0
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jnc @f
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sub edi, 3
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@@:
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mov [line_begin], edi
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jmp .24bit.scanline
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.indexed:
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stdcall img.create, eax, ebx, Image.bpp8
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mov [retvalue], eax
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test eax, eax
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jz .quit
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mov ebx, eax
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mov esi, [_data]
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add esi, [_length]
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sub esi, 768
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mov edi, [eax + Image.Palette]
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mov ecx, 256
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xor eax, eax
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@@:
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lodsw
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xchg al, ah
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shl eax, 8
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lodsb
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stosd
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dec ecx
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jnz @b
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mov esi, [_data]
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add esi, 128
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mov edi, [ebx + Image.Data]
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.indexed.line:
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mov ebx, [total_bpl]
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.indexed.next_byte:
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call pcx._.get_byte
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@@:
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stosb
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dec ecx
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jnz @b
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test ebx, ebx
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jnz .indexed.next_byte
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dec [ysize]
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jnz .indexed.line
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jmp .quit
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.monochrome:
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stdcall img.create, eax, ebx, Image.bpp1
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mov [retvalue], eax
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test eax, eax
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jz .quit
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mov edi, [eax + Image.Palette]
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mov [edi], dword 0xff000000
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mov [edi + 4], dword 0xffffffff
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mov esi, [_data]
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add esi, 128
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mov edi, [eax + Image.Data]
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.monochrome.line:
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mov ebx, [total_bpl]
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.monochrome.next_byte:
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call pcx._.get_byte
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@@:
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stosb
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dec ecx
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jnz @b
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test ebx, ebx
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jnz .monochrome.next_byte
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dec [ysize]
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jnz .monochrome.line
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; jmp .quit
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.quit:
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popa
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mov eax, [retvalue]
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ret
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endp
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;;================================================================================================;;
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proc img.encode.pcx _img, _p_length, _options ;///////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Encode image into raw data in pcx format ;;
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;;------------------------------------------------------------------------------------------------;;
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;> _img = pointer to image ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = 0 (error) or pointer to encoded data ;;
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;< _p_length = encoded data length ;;
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;;================================================================================================;;
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xor eax, eax
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ret
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endp
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;! Below are private procs you should never call directly from your code ;;
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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proc pcx._.get_byte
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xor ecx, ecx
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lodsb
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cmp al, 0xC0
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setb cl
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jb .done
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and al, 0x3F
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mov cl, al
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lodsb
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.done:
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sub ebx, ecx
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ret
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endp
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;! Below is private data you should never use directly from your code ;;
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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