;;================================================================================================;;
;;//// libimg.asm //// (c) mike.dld, 2007-2008, (c) diamond, 2009 ////////////////////////////////;;
;;================================================================================================;;
;;                                                                                                ;;
;; This file is part of Common development libraries (Libs-Dev).                                  ;;
;;                                                                                                ;;
;; Libs-Dev is free software: you can redistribute it and/or modify it under the terms of the GNU ;;
;; Lesser General Public License as published by the Free Software Foundation, either version 2.1 ;;
;; of the License, or (at your option) any later version.                                         ;;
;;                                                                                                ;;
;; Libs-Dev is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without  ;;
;; even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  ;;
;; Lesser General Public License for more details.                                                ;;
;;                                                                                                ;;
;; You should have received a copy of the GNU Lesser General Public License along with Libs-Dev.  ;;
;; If not, see <http://www.gnu.org/licenses/>.                                                    ;;
;;                                                                                                ;;
;;================================================================================================;;


format MS COFF

public @EXPORT as 'EXPORTS'

include '../../../../struct.inc'
include '../../../../proc32.inc'
include '../../../../macros.inc'
purge section,mov,add,sub

include 'libimg.inc'

section '.flat' code readable align 16

include 'bmp/bmp.asm'
include 'gif/gif.asm'
include 'jpeg/jpeg.asm'
include 'png/png.asm'
include 'tga/tga.asm'
include 'z80/z80.asm'
include 'ico_cur/ico_cur.asm'
include 'pcx/pcx.asm'

;;================================================================================================;;
proc lib_init ;///////////////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Library entry point (called after library load)                                                ;;
;;------------------------------------------------------------------------------------------------;;
;> eax = pointer to memory allocation routine                                                     ;;
;> ebx = pointer to memory freeing routine                                                        ;;
;> ecx = pointer to memory reallocation routine                                                   ;;
;> edx = pointer to library loading routine                                                       ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 1 (fail) / 0 (ok) (library initialization result)                                        ;;
;;================================================================================================;;
    mov [mem.alloc], eax
    mov [mem.free], ebx
    mov [mem.realloc], ecx
    mov [dll.load], edx

    call    img.initialize.jpeg

    xor eax, eax
    cpuid
    cmp ecx, 'ntel'
    jnz @f
    mov dword [img._.do_rgb.handlers + (Image.bpp15-1)*4], img._.do_rgb.bpp15.intel
    mov dword [img._.do_rgb.handlers + (Image.bpp16-1)*4], img._.do_rgb.bpp16.intel
  @@:

  .ok:  xor eax,eax
    ret
endp

;;================================================================================================;;
proc img.is_img _data, _length ;//////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< --- TBD ---                                                                                    ;;
;;================================================================================================;;
    push    ebx
    mov ebx, img._.formats_table
    @@: stdcall [ebx + FormatsTableEntry.Is], [_data], [_length]
    or  eax, eax
    jnz @f
    add ebx, sizeof.FormatsTableEntry
    cmp dword[ebx], 0
    jnz @b
    xor eax, eax
    @@: pop ebx
    ret
endp

;;================================================================================================;;
proc img.info _data, _length ;////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< --- TBD ---                                                                                    ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img.from_file _filename ;////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to image                                                                     ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img.to_file _img, _filename ;////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img.from_rgb _rgb_data ;/////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to image                                                                     ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img.to_rgb2 _img, _out ;/////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< --- TBD ---                                                                                    ;;
;;================================================================================================;;
    push    esi edi
    mov esi, [_img]
    stdcall img._.validate, esi
    or  eax, eax
    jnz .ret
    mov edi, [_out]
    call    img._.do_rgb
.ret:
    pop edi esi
    ret
endp

;;================================================================================================;;
proc img.to_rgb _img ;////////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to rgb_data (array of [rgb] triplets)                                        ;;
;;================================================================================================;;
    push    esi edi
    mov esi, [_img]
    stdcall img._.validate, esi
    or  eax, eax
    jnz .error

    mov esi, [_img]
    mov ecx, [esi + Image.Width]
    imul    ecx, [esi + Image.Height]
    lea eax, [ecx * 3 + 4 * 3]
    invoke  mem.alloc, eax
    or  eax, eax
    jz  .error

    mov edi, eax
    push    eax
    mov eax, [esi + Image.Width]
    stosd
    mov eax, [esi + Image.Height]
    stosd
    call    img._.do_rgb
    pop eax
    pop edi esi
    ret

  .error:
    xor eax, eax
    pop edi esi
    ret
endp

;;================================================================================================;;
proc img._.do_rgb ;///////////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< --- TBD ---                                                                                    ;;
;;================================================================================================;;
    mov ecx, [esi + Image.Width]
    imul    ecx, [esi + Image.Height]
    mov eax, [esi + Image.Type]
    jmp dword [.handlers + (eax-1)*4]

align 16
.bpp8:
; 8 BPP -> 24 BPP
    push    ebx
    mov ebx, [esi + Image.Palette]
    mov esi, [esi + Image.Data]
    sub ecx, 1
    jz  .bpp8.last
@@:
    movzx   eax, byte [esi]
    add esi, 1
    mov eax, [ebx + eax*4]
    mov [edi], eax
    add edi, 3
    sub ecx, 1
    jnz @b
.bpp8.last:
    movzx   eax, byte [esi]
    mov eax, [ebx + eax*4]
    mov [edi], ax
    shr eax, 16
    mov [edi+2], al
    pop ebx
    ret

; 15 BPP -> 24 BPP
.bpp15.intel:
    push    ebx ebp
    sub ecx, 4
    jb  .bpp15.tail
align 16
.bpp15.intel.loop:
repeat 2
    mov ebx, [esi]
    mov al, [esi]
    mov ah, [esi+1]
    add esi, 4
    and al, 0x1F
    and ah, 0x1F shl 2
    mov ebp, ebx
    mov dl, al
    mov dh, ah
    shr al, 2
    shr ah, 4
    shl dl, 3
    shl dh, 1
    and ebp, 0x1F shl 5
    add al, dl
    add ah, dh
    shr ebp, 2
    mov [edi], al
    mov [edi+2], ah
    mov eax, ebx
    mov ebx, ebp
    shr eax, 16
    shr ebx, 5
    add ebx, ebp
    mov ebp, eax
    mov [edi+1], bl
    and eax, (0x1F) or (0x1F shl 10)
    and ebp, 0x1F shl 5
    lea edx, [eax+eax]
    shr al, 2
    mov ebx, ebp
    shr ah, 4
    shl dl, 2
    shr ebx, 2
    shr ebp, 7
    add al, dl
    add ah, dh
    mov [edi+3], al
    add ebx, ebp
    mov [edi+5], ah
    mov [edi+4], bl
    add edi, 6
end repeat
    sub ecx, 4
    jnb .bpp15.intel.loop
.bpp15.tail:
    add ecx, 4
    jz  .bpp15.done
@@:
    movzx   eax, word [esi]
    mov ebx, eax
    add esi, 2
    and eax, (0x1F) or (0x1F shl 10)
    and ebx, 0x1F shl 5
    lea edx, [eax+eax]
    shr al, 2
    mov ebp, ebx
    shr ebx, 2
    shr ah, 4
    shl dl, 2
    shr ebp, 7
    add eax, edx
    add ebx, ebp
    mov [edi], al
    mov [edi+1], bl
    mov [edi+2], ah
    add edi, 3
    sub ecx, 1
    jnz @b
.bpp15.done:
    pop ebp ebx
    ret

.bpp15.amd:
    push    ebx ebp
    sub ecx, 4
    jb  .bpp15.tail
align 16
.bpp15.amd.loop:
repeat 4
if (% mod 2) = 1
    mov eax, dword [esi]
    mov ebx, dword [esi]
else
    movzx   eax, word [esi]
    mov ebx, eax
end if
    add esi, 2
    and eax, (0x1F) or (0x1F shl 10)
    and ebx, 0x1F shl 5
    lea edx, [eax+eax]
    shr al, 2
    mov ebp, ebx
    shr ebx, 2
    shr ah, 4
    shl dl, 2
    shr ebp, 7
    add eax, edx
    add ebx, ebp
    mov [edi], al
    mov [edi+1], bl
    mov [edi+2], ah
    add edi, 3
end repeat
    sub ecx, 4
    jnb .bpp15.amd.loop
    jmp .bpp15.tail

; 16 BPP -> 24 BPP
.bpp16.intel:
    push    ebx ebp
    sub ecx, 4
    jb  .bpp16.tail
align 16
.bpp16.intel.loop:
repeat 2
    mov ebx, [esi]
    mov al, [esi]
    mov ah, [esi+1]
    add esi, 4
    and al, 0x1F
    and ah, 0x1F shl 3
    mov ebp, ebx
    mov dl, al
    mov dh, ah
    shr al, 2
    shr ah, 5
    shl dl, 3
    and ebp, 0x3F shl 5
    add al, dl
    add ah, dh
    shr ebp, 3
    mov [edi], al
    mov [edi+2], ah
    mov eax, ebx
    mov ebx, ebp
    shr eax, 16
    shr ebx, 6
    add ebx, ebp
    mov ebp, eax
    mov [edi+1], bl
    and eax, (0x1F) or (0x1F shl 11)
    and ebp, 0x3F shl 5
    mov edx, eax
    shr al, 2
    mov ebx, ebp
    shr ah, 5
    shl dl, 3
    shr ebx, 3
    shr ebp, 9
    add al, dl
    add ah, dh
    mov [edi+3], al
    add ebx, ebp
    mov [edi+5], ah
    mov [edi+4], bl
    add edi, 6
end repeat
    sub ecx, 4
    jnb .bpp16.intel.loop
.bpp16.tail:
    add ecx, 4
    jz  .bpp16.done
@@:
    movzx   eax, word [esi]
    mov ebx, eax
    add esi, 2
    and eax, (0x1F) or (0x1F shl 11)
    and ebx, 0x3F shl 5
    mov edx, eax
    shr al, 2
    mov ebp, ebx
    shr ebx, 3
    shr ah, 5
    shl dl, 3
    shr ebp, 9
    add eax, edx
    add ebx, ebp
    mov [edi], al
    mov [edi+1], bl
    mov [edi+2], ah
    add edi, 3
    sub ecx, 1
    jnz @b
.bpp16.done:
    pop ebp ebx
    ret

.bpp16.amd:
    push    ebx ebp
    sub ecx, 4
    jb  .bpp16.tail
align 16
.bpp16.amd.loop:
repeat 4
if (% mod 2) = 1
    mov eax, dword [esi]
    mov ebx, dword [esi]
else
    movzx   eax, word [esi]
    mov ebx, eax
end if
    add esi, 2
    and eax, (0x1F) or (0x1F shl 11)
    and ebx, 0x3F shl 5
    mov edx, eax
    shr al, 2
    mov ebp, ebx
    shr ebx, 3
    shr ah, 5
    shl dl, 3
    shr ebp, 9
    add eax, edx
    add ebx, ebp
    mov [edi], al
    mov [edi+1], bl
    mov [edi+2], ah
    add edi, 3
end repeat
    sub ecx, 4
    jnb .bpp16.amd.loop
    jmp .bpp16.tail

align 16
.bpp24:
; 24 BPP -> 24 BPP
    lea ecx, [ecx*3 + 3]
    mov esi, [esi + Image.Data]
    shr ecx, 2
    rep movsd
    ret

align 16
.bpp32:
; 32 BPP -> 24 BPP
    mov esi, [esi + Image.Data]

    @@:
    mov eax, [esi]
    mov [edi], ax
    shr eax, 16
    mov [edi+2], al
    add esi, 4
    add edi, 3
    sub ecx, 1
    jnz @b

    @@:
    ret

align 16
.bpp1:
    push ebx edx
    mov ebx, esi
    mov esi, [ebx + Image.Data]
    mov ecx, [ebx + Image.Height]
  .bpp1.pre:
    mov edx, [ebx + Image.Width]
    mov eax, 7
  .bpp1.begin:
    push ecx esi
    xor cx, cx
    bt [esi], eax
    setc cl
    mov esi, [ebx + Image.Palette]
     jcxz @f
    add esi, 4
  @@:
    mov ecx, 3
    cld
    rep movsb
    pop esi ecx
    dec edx
     jz .bpp1.end_line
    dec eax
     jns .bpp1.begin
    mov eax, 7
    inc esi
     jmp .bpp1.begin

  .bpp1.end_line:
    dec ecx
     jz .bpp1.quit
    inc esi
     jmp .bpp1.pre

  .bpp1.quit:
    pop edx ebx
    ret

endp

;;================================================================================================;;
proc img.decode _data, _length, _options ;////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to image                                                                     ;;
;;================================================================================================;;
    push    ebx
    mov ebx, img._.formats_table
    @@: stdcall [ebx + FormatsTableEntry.Is], [_data], [_length]
    or  eax, eax
    jnz @f
    add ebx, sizeof.FormatsTableEntry
    cmp dword[ebx], eax ;0
    jnz @b
    pop ebx
    ret
    @@: mov eax, [ebx + FormatsTableEntry.Decode]
    pop ebx
    leave
    jmp eax
endp

;;================================================================================================;;
proc img.encode _img, _p_length, _options ;///////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to encoded data                                                              ;;
;< [_p_length] = data length                                                                      ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img.create _width, _height, _type ;//////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to image                                                                     ;;
;;================================================================================================;;
    push    ecx

    stdcall img._.new
    or  eax, eax
    jz  .error

    mov ecx, [_type]
    mov [eax + Image.Type], ecx

    push    eax

    stdcall img._.resize_data, eax, [_width], [_height]
    or  eax, eax
    jz  .error.2

    pop eax
    jmp .ret

  .error.2:
;       pop     eax
    stdcall img._.delete; eax
    xor eax, eax

  .error:
  .ret:
    pop ecx
    ret
endp

;;================================================================================================;;
proc img.destroy.layer _img ;/////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
    mov eax, [_img]
    mov edx, [eax + Image.Previous]
    test    edx, edx
    jz  @f
    push    [eax + Image.Next]
    pop [edx + Image.Next]
@@:
    mov edx, [eax + Image.Next]
    test    edx, edx
    jz  @f
    push    [eax + Image.Previous]
    pop [edx + Image.Previous]
@@:
    stdcall img._.delete, eax
    ret
endp

;;================================================================================================;;
proc img.destroy _img ;///////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
    push    1
    mov eax, [_img]
    mov eax, [eax + Image.Previous]
.destroy_prev_loop:
    test    eax, eax
    jz  .destroy_prev_done
    pushd   [eax + Image.Previous]
    stdcall img._.delete, eax
    test    eax, eax
    jnz @f
    mov byte [esp+4], 0
@@:
    pop eax
    jmp .destroy_prev_loop
.destroy_prev_done:
    mov eax, [_img]
.destroy_next_loop:
    pushd   [eax + Image.Next]
    stdcall img._.delete, eax
    test    eax, eax
    jnz @f
    mov byte [esp+4], 0
@@:
    pop eax
    test    eax, eax
    jnz .destroy_next_loop
    pop eax
    ret
endp

;;================================================================================================;;
proc img.count _img ;/////////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Get number of images in the list (e.g. in animated GIF file)                                   ;;
;;------------------------------------------------------------------------------------------------;;
;> _img = pointer to image                                                                        ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = -1 (fail) / >0 (ok)                                                                      ;;
;;================================================================================================;;
    push    ecx edx
    mov edx, [_img]
    stdcall img._.validate, edx
    or  eax, eax
    jnz .error

    @@: mov eax, [edx + Image.Previous]
    or  eax, eax
    jz  @f
    mov edx, eax
    jmp @b

    @@: xor ecx, ecx
    @@: inc ecx
    mov eax, [edx + Image.Next]
    or  eax, eax
    jz  .exit
    mov edx, eax
    jmp @b

  .exit:
    mov eax, ecx
    pop edx ecx
    ret

  .error:
    or  eax, -1
    pop edx ecx
    ret
endp

;;//// image processing //////////////////////////////////////////////////////////////////////////;;

;;================================================================================================;;
proc img.lock_bits _img, _start_line, _end_line ;/////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to bits                                                                      ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img.unlock_bits _img, _lock ;////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img.flip.layer _img, _flip_kind ;////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Flip image layer                                                                               ;;
;;------------------------------------------------------------------------------------------------;;
;> _img = pointer to image                                                                        ;;
;> _flip_kind = one of FLIP_* constants                                                           ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
locals
  scanline_len dd ?
endl

    push    ebx esi edi
    mov ebx, [_img]
    stdcall img._.validate, ebx
    or  eax, eax
    jnz .error

    mov ecx, [ebx + Image.Height]
    mov eax, [ebx + Image.Width]
    call    img._.get_scanline_len
    mov [scanline_len], eax

    test    [_flip_kind], FLIP_VERTICAL
    jz  .dont_flip_vert

    imul    eax, ecx
    sub eax, [scanline_len]
    shr ecx, 1
    mov esi, [ebx + Image.Data]
    lea edi, [esi + eax]
    
  .next_line_vert:
    push    ecx

    mov ecx, [scanline_len]
    push    ecx
    shr ecx, 2
    @@: mov eax, [esi]
    xchg    eax, [edi]
    mov [esi], eax
    add esi, 4
    add edi, 4
    sub ecx, 1
    jnz @b
    pop ecx
    and ecx, 3
    jz  .cont_line_vert
    @@:
    mov al, [esi]
    xchg    al, [edi]
    mov [esi], al
    add esi, 1
    add edi, 1
    dec ecx
    jnz @b
    .cont_line_vert:

    pop ecx
    mov eax, [scanline_len]
    shl eax, 1
    sub edi, eax
    dec ecx
    jnz .next_line_vert

  .dont_flip_vert:

    test    [_flip_kind], FLIP_HORIZONTAL
    jz  .exit

    mov ecx, [ebx + Image.Height]
    mov eax, [ebx + Image.Type]
    mov esi, [ebx + Image.Data]
    mov edi, [scanline_len]
    add edi, esi
    jmp dword [.handlers_horz + (eax-1)*4]

.bpp32_horz:
    sub edi, 4

  .next_line_horz:
    push    ecx esi edi

    mov ecx, [scanline_len]
    shr ecx, 3
    @@: mov eax, [esi]
    xchg    eax, [edi]
    mov [esi], eax
    add esi, 4
    add edi, -4
    sub ecx, 1
    jnz @b

    pop edi esi ecx
    add esi, [scanline_len]
    add edi, [scanline_len]
    dec ecx
    jnz .next_line_horz
    jmp .exit

.bpp1x_horz:
    sub edi, 2
  .next_line_horz1x:
    push    ecx esi edi

    mov ecx, [ebx + Image.Width]
    @@: mov ax, [esi]
    mov dx, [edi]
    mov [edi], ax
    mov [esi], dx
    add esi, 2
    sub edi, 2
    sub ecx, 2
    ja  @b

    pop edi esi ecx
    add esi, [scanline_len]
    add edi, [scanline_len]
    dec ecx
    jnz .next_line_horz1x
    jmp .exit

.bpp8_horz:
    dec edi
  .next_line_horz8:
    push    ecx esi edi

    mov ecx, [scanline_len]
    shr ecx, 1
    @@: mov al, [esi]
    mov dl, [edi]
    mov [edi], al
    mov [esi], dl
    add esi, 1
    sub edi, 1
    sub ecx, 1
    jnz @b

    pop edi esi ecx
    add esi, [scanline_len]
    add edi, [scanline_len]
    dec ecx
    jnz .next_line_horz8
    jmp .exit

.bpp24_horz:
    sub edi, 3
  .next_line_horz24:
    push    ecx esi edi

    mov ecx, [ebx + Image.Width]
    @@:
    mov al, [esi]
    mov dl, [edi]
    mov [edi], al
    mov [esi], dl
    mov al, [esi+1]
    mov dl, [edi+1]
    mov [edi+1], al
    mov [esi+1], dl
    mov al, [esi+2]
    mov dl, [edi+2]
    mov [edi+2], al
    mov [esi+2], dl
    add esi, 3
    sub edi, 3
    sub ecx, 2
    ja  @b

    pop edi esi ecx
    add esi, [scanline_len]
    add edi, [scanline_len]
    dec ecx
    jnz .next_line_horz24
    jmp .exit

.bpp1_horz:
    push eax edx
    mov edi, [scanline_len]
    mov edx, [ebx+Image.Width]
    and edx,  0x07
    neg dl
    add dl, 8
    and dl, 0x07                                        ; clear if cl=8
.bpp1_horz.begin:
    push ebx ecx edx esi
    mov eax, 7
    add edi, esi
    sub edi, 1
    mov ebx, [ebx+Image.Width]
    shr ebx, 1
.bpp1_horz.flip_line:
    xor ecx, ecx
    bt  [esi], eax
    setc cl
    bt  [edi], edx
     jc .bpp1_horz.one
  .bpp1_horz.zero:
    btr [esi], eax
     jmp @f
  .bpp1_horz.one:
    bts [esi], eax
  @@:
     jecxz .bpp1_horz.reset
  .bpp1_horz.set:
    bts [edi], edx
     jmp @f
  .bpp1_horz.reset:
    btr [edi], edx
  @@:
    inc edx
    and edx, 0x07
     jnz @f
    dec edi
  @@:
    dec eax
     jns @f
    mov eax, 7
    inc esi
  @@:
    dec ebx
     jnz .bpp1_horz.flip_line

    pop esi edx ecx ebx
    add esi, [scanline_len]
    mov edi, [scanline_len]
    dec ecx
     jnz .bpp1_horz.begin
    pop edx eax

  .exit:
    xor eax, eax
    inc eax
    pop edi esi ebx
    ret

  .error:
    xor eax, eax
    pop edi esi ebx
    ret
endp

;;================================================================================================;;
proc img.flip _img, _flip_kind ;//////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Flip all layers of image                                                                       ;;
;;------------------------------------------------------------------------------------------------;;
;> _img = pointer to image                                                                        ;;
;> _flip_kind = one of FLIP_* constants                                                           ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
    push    1
    mov ebx, [_img]
@@:
    mov eax, [ebx + Image.Previous]
    test    eax, eax
    jz  .loop
    mov ebx, eax
    jmp @b
.loop:
    stdcall img.flip.layer, ebx, [_flip_kind]
    test    eax, eax
    jnz @f
    mov byte [esp], 0
@@:
    mov ebx, [ebx + Image.Next]
    test    ebx, ebx
    jnz .loop
    pop eax
    ret
endp

;;================================================================================================;;
proc img.rotate.layer _img, _rotate_kind ;////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Rotate image layer                                                                             ;;
;;------------------------------------------------------------------------------------------------;;
;> _img = pointer to image                                                                        ;;
;> _rotate_kind = one of ROTATE_* constants                                                       ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
locals
  scanline_len_old    dd ?
  scanline_len_new    dd ?
  scanline_pixels_new dd ?
  line_buffer         dd ?
  pixels_ptr          dd ?
endl

    mov [line_buffer], 0

    push    ebx esi edi
    mov ebx, [_img]
    stdcall img._.validate, ebx
    or  eax, eax
    jnz .error

    cmp [_rotate_kind], ROTATE_90_CCW
    je  .rotate_ccw_low
    cmp [_rotate_kind], ROTATE_90_CW
    je  .rotate_cw_low
    cmp [_rotate_kind], ROTATE_180
    je  .flip
    jmp .exit

  .rotate_ccw_low:
    mov eax, [ebx + Image.Height]
    mov [scanline_pixels_new], eax
    call    img._.get_scanline_len
    mov [scanline_len_new], eax

    invoke  mem.alloc, eax
    or  eax, eax
    jz  .error
    mov [line_buffer], eax

    mov eax, [ebx + Image.Width]
    mov ecx, eax
    call    img._.get_scanline_len
    mov [scanline_len_old], eax

    mov eax, [scanline_len_new]
    imul    eax, ecx
    add eax, [ebx + Image.Data]
    mov [pixels_ptr], eax

    cmp [ebx + Image.Type], Image.bpp1
    jz  .rotate_ccw1
    cmp [ebx + Image.Type], Image.bpp8
    jz  .rotate_ccw8
    cmp [ebx + Image.Type], Image.bpp24
    jz  .rotate_ccw24
    cmp [ebx + Image.Type], Image.bpp32
    jz  .rotate_ccw32

  .next_column_ccw_low1x:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -2

    mov ecx, [scanline_pixels_new]
    mov esi, [ebx + Image.Data]
    mov edi, [line_buffer]
    @@: mov ax, [esi]
    mov [edi], ax
    add esi, edx
    add edi, 2
    sub ecx, 1
    jnz @b

    mov eax, [scanline_pixels_new]
    mov edi, [ebx + Image.Data]
    lea esi, [edi + 2]
    mov edx, [scanline_len_old]
    @@: mov ecx, edx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb
    add esi, 1
    sub eax, 1
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, [scanline_pixels_new]
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    mov edx, ecx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb

    pop ecx
    jmp .next_column_ccw_low1x

.rotate_ccw32:
  .next_column_ccw_low:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -4

    mov ecx, [scanline_pixels_new]
    mov esi, [ebx + Image.Data]
    mov edi, [line_buffer]
    @@: mov eax, [esi]
    stosd
    add esi, edx
    dec ecx
    jnz @b

    mov eax, [scanline_pixels_new]
    mov edi, [ebx + Image.Data]
    lea esi, [edi + 4]
    mov edx, [scanline_len_old]
    shr edx, 2
    @@: mov ecx, edx
    rep movsd
    add esi, 4
    dec eax
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, [scanline_pixels_new]
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    rep movsd

    pop ecx
    jmp .next_column_ccw_low

.rotate_ccw8:
  .next_column_ccw_low8:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -1

    mov ecx, [scanline_pixels_new]
    mov esi, [ebx + Image.Data]
    mov edi, [line_buffer]
    @@: mov al, [esi]
    mov [edi], al
    add esi, edx
    add edi, 1
    sub ecx, 1
    jnz @b

    mov eax, [scanline_pixels_new]
    mov edi, [ebx + Image.Data]
    lea esi, [edi + 1]
    mov edx, [scanline_len_old]
    @@: mov ecx, edx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb
    add esi, 1
    sub eax, 1
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, [scanline_pixels_new]
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    mov edx, ecx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb

    pop ecx
    jmp .next_column_ccw_low8

.rotate_ccw24:
  .next_column_ccw_low24:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -3

    mov ecx, [scanline_pixels_new]
    mov esi, [ebx + Image.Data]
    mov edi, [line_buffer]
    @@: mov al, [esi]
    mov [edi], al
    mov al, [esi+1]
    mov [edi+1], al
    mov al, [esi+2]
    mov [edi+2], al
    add esi, edx
    add edi, 3
    sub ecx, 1
    jnz @b

    mov eax, [scanline_pixels_new]
    mov edi, [ebx + Image.Data]
    lea esi, [edi + 3]
    mov edx, [scanline_len_old]
    @@: mov ecx, edx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb
    add esi, 3
    sub eax, 1
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, eax
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    shr ecx, 2
    rep movsd
    mov ecx, eax
    and ecx, 3
    rep movsb

    pop ecx
    jmp .next_column_ccw_low24

.rotate_ccw1:
    push ecx edx

    mov eax, [ebx+Image.Height]
    add eax, 7
    shr eax, 3
    mul word[ebx+Image.Width]
    shl eax, 16
    shrd eax, edx, 16
    push eax                                            ; save new data size

    invoke  mem.alloc, eax
    or  eax, eax
    jz  .error
    push eax                                            ; save pointer to new data

    mov ecx, [ebx+Image.Width]
    and ecx,  0x07
    neg cl
    add cl, 8
    and cl, 0x07                                        ; clear if cl=8

    mov esi, eax
    mov edi, [ebx+Image.Data]
    mov eax, 7
    mov edx, [scanline_len_old]
    dec edx
    add edi, edx

  .rotate_ccw1.begin:
    bt  [edi], ecx
     jc .rotate_ccw1.one
  .rotate_ccw1.zero:
    btr [esi], eax
     jmp @f
  .rotate_ccw1.one:
    bts [esi], eax
  @@:
    add edi, [scanline_len_old]
    dec [scanline_pixels_new]
     jz .rotate_ccw1.end_of_line
    dec eax
     jns .rotate_ccw1.begin
    mov eax, 7
    inc esi
     jmp .rotate_ccw1.begin

  .rotate_ccw1.end_of_line:
    inc esi
    mov eax, 7
    mov edi, [ebx+Image.Height]
    mov [scanline_pixels_new],  edi
    inc ecx
    and cl, 0x07
     jz @f
    mov edi, [ebx+Image.Data]
    add edi, edx
     jmp .rotate_ccw1.begin 
  @@:
    dec edx
     js .rotate_ccw1.quit
    mov edi, [ebx+Image.Data]
    add edi, edx
     jmp .rotate_ccw1.begin

  .rotate_ccw1.quit:
    pop eax                                             ; get pointer to new data
    mov esi, eax
    mov edi, [ebx + Image.Data]
    pop ecx                                             ; get new data size
    rep movsb

    invoke  mem.free, eax

    pop edx ecx
     jmp .exchange_dims

  .rotate_cw_low:
    mov eax, [ebx + Image.Height]
    mov [scanline_pixels_new], eax
    call    img._.get_scanline_len
    mov [scanline_len_new], eax

    invoke  mem.alloc, eax
    or  eax, eax
    jz  .error
    mov [line_buffer], eax

    mov eax, [ebx + Image.Width]
    mov ecx, eax
    call    img._.get_scanline_len
    mov [scanline_len_old], eax

    mov eax, [scanline_len_new]
    imul    eax, ecx
    add eax, [ebx + Image.Data]
    mov [pixels_ptr], eax

    cmp [ebx + Image.Type], Image.bpp1
    jz  .rotate_cw1
    cmp [ebx + Image.Type], Image.bpp8
    jz  .rotate_cw8
    cmp [ebx + Image.Type], Image.bpp24
    jz  .rotate_cw24
    cmp [ebx + Image.Type], Image.bpp32
    jz  .rotate_cw32

  .next_column_cw_low1x:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -2

    mov ecx, [scanline_pixels_new]
    mov esi, [pixels_ptr]
    add esi, -2
    mov edi, [line_buffer]
    @@: mov ax, [esi]
    mov [edi], ax
    sub esi, edx
    add edi, 2
    sub ecx, 1
    jnz @b

    mov eax, [scanline_pixels_new]
    dec eax
    mov edi, [ebx + Image.Data]
    add edi, [scanline_len_old]
    lea esi, [edi + 2]
    mov edx, [scanline_len_old]
    @@: mov ecx, edx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb
    add esi, 3
    sub eax, 1
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, eax
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    shr ecx, 2
    rep movsd
    mov ecx, eax
    and ecx, 3
    rep movsb

    pop ecx
    jmp .next_column_cw_low1x

.rotate_cw32:
  .next_column_cw_low:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -4

    mov ecx, [scanline_pixels_new]
    mov esi, [pixels_ptr]
    add esi, -4
    mov edi, [line_buffer]
    @@: mov eax, [esi]
    stosd
    sub esi, edx
    dec ecx
    jnz @b

    mov eax, [scanline_pixels_new]
    dec eax
    mov edi, [ebx + Image.Data]
    add edi, [scanline_len_old]
    lea esi, [edi + 4]
    mov edx, [scanline_len_old]
    shr edx, 2
    @@: mov ecx, edx
    rep movsd
    add esi, 4
    dec eax
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, [scanline_pixels_new]
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    rep movsd

    pop ecx
    jmp .next_column_cw_low

.rotate_cw8:
  .next_column_cw_low8:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -1

    mov ecx, [scanline_pixels_new]
    mov esi, [pixels_ptr]
    add esi, -1
    mov edi, [line_buffer]
    @@: mov al, [esi]
    mov [edi], al
    sub esi, edx
    add edi, 1
    sub ecx, 1
    jnz @b

    mov eax, [scanline_pixels_new]
    dec eax
    mov edi, [ebx + Image.Data]
    add edi, [scanline_len_old]
    lea esi, [edi + 1]
    mov edx, [scanline_len_old]
    @@: mov ecx, edx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb
    add esi, 1
    sub eax, 1
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, eax
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    shr ecx, 2
    rep movsd
    mov ecx, eax
    and ecx, 3
    rep movsb

    pop ecx
    jmp .next_column_cw_low8

.rotate_cw24:
  .next_column_cw_low24:
    dec ecx
    js  .exchange_dims
    push    ecx

    mov edx, [scanline_len_old]
    add [scanline_len_old], -3

    mov ecx, [scanline_pixels_new]
    mov esi, [pixels_ptr]
    add esi, -3
    mov edi, [line_buffer]
    @@: mov al, [esi]
    mov [edi], al
    mov al, [esi+1]
    mov [edi+1], al
    mov al, [esi+2]
    mov [edi+2], al
    sub esi, edx
    add edi, 3
    sub ecx, 1
    jnz @b

    mov eax, [scanline_pixels_new]
    dec eax
    mov edi, [ebx + Image.Data]
    add edi, [scanline_len_old]
    lea esi, [edi + 3]
    mov edx, [scanline_len_old]
    @@: mov ecx, edx
    shr ecx, 2
    rep movsd
    mov ecx, edx
    and ecx, 3
    rep movsb
    add esi, 3
    sub eax, 1
    jnz @b

    mov eax, [scanline_len_new]
    sub [pixels_ptr], eax
    mov ecx, eax
    mov esi, [line_buffer]
    mov edi, [pixels_ptr]
    shr ecx, 2
    rep movsd
    mov ecx, eax
    and ecx, 3
    rep movsb

    pop ecx
    jmp .next_column_cw_low24

.rotate_cw1:
    push ecx edx

    mov eax, [ebx+Image.Height]
    add eax, 7
    shr eax, 3
    mul word[ebx+Image.Width]
    shl eax, 16
    shrd eax, edx, 16

    push eax                                            ; save new data size

    invoke  mem.alloc, eax
    or  eax, eax
    jz  .error
    push eax                                            ; save pointer to new data

    mov ecx, 7

    mov edx, [ebx+Image.Width]
    mov [pixels_ptr],   edx                             ; we don't use pixels_ptr as it do other procedures, we save there [ebx+Image.Width]
    mov esi, eax
    mov edi, [ebx+Image.Data]
    mov eax, [ebx+Image.Height]
    dec eax
    mul [scanline_len_old]
    add edi, eax
    mov eax, 7
    mov edx, 0

  .rotate_cw1.begin:
    bt  [edi], ecx
     jc .rotate_cw1.one
  .rotate_cw1.zero:
    btr [esi], eax
     jmp @f
  .rotate_cw1.one:
    bts [esi], eax
  @@:
    sub edi, [scanline_len_old]
    dec [scanline_pixels_new]
     jz .rotate_cw1.end_of_line
    dec eax
     jns .rotate_cw1.begin
    mov eax, 7
    inc esi
     jmp .rotate_cw1.begin

  .rotate_cw1.end_of_line:
    dec [pixels_ptr]
     jz .rotate_cw1.quit
    inc esi
    mov eax, [ebx+Image.Height]
    mov [scanline_pixels_new],   eax
    mov eax, 7
    dec ecx
     js @f
    mov edi, [ebx+Image.Height]
    dec edi
    imul edi, [scanline_len_old]
    add edi, [ebx+Image.Data]
    add edi, edx
     jmp .rotate_cw1.begin
  @@:
    mov ecx, 7
    inc edx
    cmp edx, [scanline_len_old]
     je .rotate_cw1.quit
    mov edi, [ebx+Image.Height]
    dec edi
    imul edi, [scanline_len_old]
    add edi, [ebx+Image.Data]
    add edi, edx
     jmp .rotate_cw1.begin

  .rotate_cw1.quit:
    pop eax                                             ; get pointer to new data
    mov esi, eax
    mov edi, [ebx + Image.Data]
    pop ecx                                             ; get new data size
    rep movsb

    invoke  mem.free, eax

    pop edx ecx
     jmp .exchange_dims

  .flip:
    jmp .exit

  .exchange_dims:
    push    [ebx + Image.Width] [ebx + Image.Height]
    pop [ebx + Image.Width] [ebx + Image.Height]

  .exit:
    invoke  mem.free, [line_buffer]
    xor eax, eax
    inc eax
    pop edi esi ebx
    ret

  .error:
    invoke  mem.free, [line_buffer]
    xor eax, eax
    pop edi esi ebx
    ret
endp

;;================================================================================================;;
proc img.rotate _img, _rotate_kind ;//////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Rotate all layers of image                                                                     ;;
;;------------------------------------------------------------------------------------------------;;
;> _img = pointer to image                                                                        ;;
;> _rotate_kind = one of ROTATE_* constants                                                       ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
    push    1
    mov ebx, [_img]
@@:
    mov eax, [ebx + Image.Previous]
    test    eax, eax
    jz  .loop
    mov ebx, eax
    jmp @b
.loop:
    stdcall img.rotate.layer, ebx, [_rotate_kind]
    test    eax, eax
    jnz @f
    mov byte [esp], 0
@@:
    mov ebx, [ebx + Image.Next]
    test    ebx, ebx
    jnz .loop
    pop eax
    ret
endp

;;================================================================================================;;
proc img.draw _img, _x, _y, _width, _height, _xpos, _ypos ;///////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Draw image in the window                                                                       ;;
;;------------------------------------------------------------------------------------------------;;
;> _img = pointer to image                                                                        ;;
;>_x = x-coordinate in the window                                                                 ;;
;>_y = y-coordinate in the window                                                                 ;;
;>_width = maximum width to draw                                                                  ;;
;>_height = maximum height to draw                                                                ;;
;>_xpos = offset in image by x-axis                                                               ;;
;>_ypos = offset in image by y-axis                                                               ;;
;;------------------------------------------------------------------------------------------------;;
;< no return value                                                                                ;;
;;================================================================================================;;
    push    ebx esi edi
    mov ebx, [_img]
    stdcall img._.validate, ebx
    test    eax, eax
    jnz .done
    mov ecx, [ebx + Image.Width]
    sub ecx, [_xpos]
    jbe .done
    cmp ecx, [_width]
    jb  @f
    mov ecx, [_width]
@@:
    mov edx, [ebx + Image.Height]
    sub edx, [_ypos]
    jbe .done
    cmp edx, [_height]
    jb  @f
    mov edx, [_height]
@@:
    mov eax, [ebx + Image.Width]
    sub eax, ecx
    call    img._.get_scanline_len
    shl ecx, 16
    add ecx, edx
    push    eax
    mov eax, [ebx + Image.Width]
    imul    eax, [_ypos]
    add eax, [_xpos]
    call    img._.get_scanline_len
    add eax, [ebx + Image.Data]
    mov edx, [_x - 2]
    mov dx, word [_y]
    mov esi, [ebx + Image.Type]
    mov esi, [type2bpp + (esi-1)*4]
    mov edi, [ebx + Image.Palette]
    xchg    eax, ebx
    pop eax
    push    ebp
    push    65
    pop ebp
    xchg    eax, ebp
    int 40h
    pop ebp
.done:
    pop edi esi ebx
    ret
endp

;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Below are private procs you should never call directly from your code                          ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;


;;================================================================================================;;
proc img._.validate, _img ;///////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< --- TBD ---                                                                                    ;;
;;================================================================================================;;
    xor eax, eax
    ret
endp

;;================================================================================================;;
proc img._.new ;//////////////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to image                                                                     ;;
;;================================================================================================;;
    invoke  mem.alloc, sizeof.Image
    test    eax, eax
    jz  @f
    push    ecx
    xor ecx, ecx
    mov [eax + Image.Data], ecx
    mov [eax + Image.Type], ecx
    mov [eax + Image.Flags], ecx
    mov [eax + Image.Extended], ecx
    mov [eax + Image.Previous], ecx
    mov [eax + Image.Next], ecx
    pop ecx
@@:
    ret
endp

;;================================================================================================;;
proc img._.delete _img ;//////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true                                                                             ;;
;;================================================================================================;;
    push    edx
    mov edx, [_img]
    cmp [edx + Image.Data], 0
    je  @f
    invoke  mem.free, [edx + Image.Data]
    @@: cmp [edx + Image.Extended], 0
    je  @f
    invoke  mem.free, [edx + Image.Extended]
    @@: invoke  mem.free, edx
    pop edx
    ret
endp

;;================================================================================================;;
proc img._.resize_data _img, _width, _height ;////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< --- TBD ---                                                                                    ;;
;;================================================================================================;;
    push    ebx esi
    mov ebx, [_img]
    mov eax, [_height]
; our memory is limited, [_width]*[_height] must not overflow
; image with width or height greater than 65535 is most likely bogus
    cmp word [_width+2], 0
    jnz .error
    cmp word [_height+2], 0
    jnz .error
    imul    eax, [_width]
    test    eax, eax
    jz  .error
; do not allow images which require too many memory
    cmp eax, 4000000h
    jae .error
    cmp [ebx + Image.Type], Image.bpp1
    jz  .bpp1
    cmp [ebx + Image.Type], Image.bpp8
    jz  .bpp8
    cmp [ebx + Image.Type], Image.bpp24
    jz  .bpp24
.bpp32:
    shl eax, 2
    jmp @f
.bpp24:
    lea eax, [eax*3]
    jmp @f
.bpp8:
    add eax, 256*4  ; for palette
    jmp @f
.bpp1:
    mov eax, [_width]
    add eax, 7
    shr eax, 3
    mul word[_height]
    shl eax, 16
    mov ax,  dx
    ror eax, 16

    push ebx
    mov ebx, eax

    mov eax, [_height]
    add eax, 7
    shr eax, 3
    mul word[_width]
    shl eax, 16
    mov ax,  dx
    ror eax, 16

    cmp eax, ebx
     jge .bpp1.skip
    mov eax, ebx
  .bpp1.skip:
    pop ebx

    add eax, 2*4    ; for palette
@@:
    mov esi, eax
    invoke  mem.realloc, [ebx + Image.Data], eax
    or  eax, eax
    jz  .error

    mov [ebx + Image.Data], eax
    push    [_width]
    pop [ebx + Image.Width]
    push    [_height]
    pop [ebx + Image.Height]
    cmp [ebx + Image.Type], Image.bpp8
    jnz @f
    lea esi, [eax + esi - 256*4]
    mov [ebx + Image.Palette], esi
    jmp .ret
@@:
    cmp [ebx + Image.Type], Image.bpp1
    jnz .ret
    lea esi, [eax + esi - 2*4]
    mov [ebx + Image.Palette], esi
    jmp .ret

  .error:
    xor eax, eax
  .ret:
    pop esi ebx
    ret
endp

;;================================================================================================;;
img._.get_scanline_len: ;/////////////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;> --- TBD ---                                                                                    ;;
;;------------------------------------------------------------------------------------------------;;
;< --- TBD ---                                                                                    ;;
;;================================================================================================;;
    cmp [ebx + Image.Type], Image.bpp1
    jz  .bpp1.1
    cmp [ebx + Image.Type], Image.bpp8
    jz  .bpp8.1
    cmp [ebx + Image.Type], Image.bpp24
    jz  .bpp24.1
    add eax, eax
    cmp [ebx + Image.Type], Image.bpp32
    jnz .quit
    add eax, eax
    jmp .quit
.bpp24.1:
    lea eax, [eax*3]
    jmp .quit
.bpp1.1:
    add eax, 7
    shr eax, 3
.bpp8.1:
.quit:
    ret


;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Below is private data you should never use directly from your code                             ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;

align 4
img._.formats_table:
  .bmp dd img.is.bmp, img.decode.bmp, img.encode.bmp
  .ico dd img.is.ico, img.decode.ico_cur, img.encode.ico
  .cur dd img.is.cur, img.decode.ico_cur, img.encode.cur
  .gif dd img.is.gif, img.decode.gif, img.encode.gif
  .png dd img.is.png, img.decode.png, img.encode.png
  .jpg dd img.is.jpg, img.decode.jpg, img.encode.jpg
  .tga dd img.is.tga, img.decode.tga, img.encode.tga
  .pcx dd img.is.pcx, img.decode.pcx, img.encode.pcx
  .z80 dd img.is.z80, img.decode.z80, img.encode.z80 ;this must be the last entry as there are no
  ;signatures in z80 screens at all
       dd 0

align 4
type2bpp    dd  8, 24, 32, 15, 16, 1
img._.do_rgb.handlers:
    dd  img._.do_rgb.bpp8
    dd  img._.do_rgb.bpp24
    dd  img._.do_rgb.bpp32
    dd  img._.do_rgb.bpp15.amd  ; can be overwritten in lib_init
    dd  img._.do_rgb.bpp16.amd  ; can be overwritten in lib_init
    dd  img._.do_rgb.bpp1

img.flip.layer.handlers_horz:
    dd  img.flip.layer.bpp8_horz
    dd  img.flip.layer.bpp24_horz
    dd  img.flip.layer.bpp32_horz
    dd  img.flip.layer.bpp1x_horz
    dd  img.flip.layer.bpp1x_horz
    dd  img.flip.layer.bpp1_horz

;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Exported functions section                                                                     ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;


align 4
@EXPORT:

export                        \
    lib_init    , 'lib_init'        , \
    0x00050007  , 'version'     , \
    img.is_img  , 'img_is_img'      , \
    img.info    , 'img_info'        , \
    img.from_file   , 'img_from_file'   , \
    img.to_file , 'img_to_file'     , \
    img.from_rgb    , 'img_from_rgb'    , \
    img.to_rgb  , 'img_to_rgb'      , \
    img.to_rgb2 , 'img_to_rgb2'     , \
    img.decode  , 'img_decode'      , \
    img.encode  , 'img_encode'      , \
    img.create  , 'img_create'      , \
    img.destroy , 'img_destroy'     , \
    img.destroy.layer, 'img_destroy_layer', \
    img.count   , 'img_count'       , \
    img.lock_bits   , 'img_lock_bits'   , \
    img.unlock_bits , 'img_unlock_bits' , \
    img.flip    , 'img_flip'        , \
    img.flip.layer  , 'img_flip_layer'  , \
    img.rotate  , 'img_rotate'      , \
    img.rotate.layer, 'img_rotate_layer', \
    img.draw        , 'img_draw'

; import from deflate unpacker
; is initialized only when PNG loading is requested
align 4
@IMPORT:

library archiver, 'archiver.obj'
import  archiver, \
    deflate_unpack2, 'deflate_unpack2'

align 4
; mutex for unpacker loading
deflate_loader_mutex    dd  0

; default palette for GIF - b&w
gif_default_palette:
    db  0, 0, 0
    db  0xFF, 0xFF, 0xFF

section '.data' data readable writable align 16
; uninitialized data - global constant tables
mem.alloc   dd ?
mem.free    dd ?
mem.realloc dd ?
dll.load    dd ?

; data for YCbCr -> RGB translation
color_table_1       rd  256
color_table_2       rd  256
color_table_3       rd  256
color_table_4       rd  256