forked from KolibriOS/kolibrios
232 lines
9.3 KiB
NASM
232 lines
9.3 KiB
NASM
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;;================================================================================================;;
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;;//// pcx.asm //// (c) dunkaist, 2010 ///////////////////////////////////////////////////////////;;
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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 Targa 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 [edi+pcx_header.magic_number], 10
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jne .is_not_pcx
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cmp [edi+pcx_header.version], 5
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jne .is_not_pcx
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cmp [edi+pcx_header.encoding], 1
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jne .is_not_pcx
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; cmp [esi+pcx_header.reserved], 1
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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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;pusha
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;dps 'is_pcx'
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;newline
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;popa
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inc eax
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pop edi ecx
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ret
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.is_not_pcx:
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;pusha
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;dps 'is_not_pcx'
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;newline
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;popa
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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 Targa 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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; IMGwidth dd ?
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; IMGheight dd ?
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; IMGbpp dd ?
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buf rb 1
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nplanes rd 1
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xsize rw 1
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ysize rw 1
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stxsize rw 1
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stysize rw 1
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total_bpl rd 1
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line_begin rd 1
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retvalue rd 1
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endl
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pusha
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mov esi, [_data]
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xor eax, eax
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mov al, byte[esi+pcx_header.nplanes]
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mov [nplanes], eax
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mul word[esi+pcx_header.bpl]
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mov [total_bpl], eax
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movzx eax, word[esi+pcx_header.xmax]
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inc ax
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sub ax, word[esi+pcx_header.xmin]
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mov [xsize], ax
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movzx ebx, word[esi+pcx_header.ymax]
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inc bx
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sub bx, word[esi+pcx_header.ymin]
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mov [ysize], bx
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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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movzx ebx, [xsize]
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movzx ecx, [ysize]
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mov edx, [eax+Image.Data]
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rol ebx, 16
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or ebx, ecx
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xor ebx, [edx]
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mov [eax+Image.Checksum], ebx
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mov esi, [_data]
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add esi, 128
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mov edi, [retvalue]
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mov edi, [edi+Image.Data]
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add edi, 2
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mov [line_begin], edi
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mov ebx, [total_bpl]
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.begin:
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mov eax, [_data]
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mov ax, word[eax+pcx_header.bpl]
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.decode:
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mov dl, byte[esi]
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inc esi
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mov [buf], dl
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and dl, 0xC0
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cmp dl, 0xC0
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jne @f
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mov dl, byte[buf]
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and dl, 0x3F
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mov dh, [esi]
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inc esi
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.write_sequence:
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mov [edi], dh
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dec ax
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dec ebx
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add edi, [nplanes]
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dec dl
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test dl, dl
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jnz .write_sequence
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test ax, ax
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jz .end_color_line
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jmp .decode
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@@:
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mov dl, byte[buf]
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mov [edi], dl
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add edi, [nplanes]
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dec ebx
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dec ax
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jz .end_color_line
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jmp .decode
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.end_color_line:
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test ebx, ebx
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jz .end_full_line
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dec [line_begin]
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mov edi, [line_begin]
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jmp .begin
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.end_full_line:
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dec word[ysize]
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jz .quit
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mov ebx, [total_bpl]
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add edi, 2
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mov [line_begin], edi
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jmp .begin
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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 Targa 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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;;================================================================================================;;
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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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;
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