656 lines
9.6 KiB
NASM
656 lines
9.6 KiB
NASM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2016. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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format MS COFF
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public @EXPORT as 'EXPORTS'
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include '../../../macros.inc'
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include '../../../proc32.inc'
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; calculate string width in pixels
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proc stringWidth, charQuantity, charHeight
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mov eax,[charHeight]
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shr eax,1
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mul [charQuantity]
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ret
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endp
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; calculate amount of chars that fits given width
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proc charsFit, areaWidth, charHeight
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shr [charHeight],1
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mov eax,[areaWidth]
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xor edx,edx
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div [charHeight]
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ret
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endp
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; calculate amount of valid chars in UTF-8 string
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; supports zero terminated string (set byteQuantity = -1)
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proc countUTF8, string, byteQuantity
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push esi
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mov edx,[byteQuantity]
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inc edx
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xor ecx,ecx
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dec ecx
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mov esi,[string]
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@@:
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inc ecx
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dec edx
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jz .done
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lodsb
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test al,al
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jz .done
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jns @b
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dec ecx
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shl al,1
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jns @b
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.next:
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mov ah,[esi]
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test ah,ah
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jns @b
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shl ah,1
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js @b
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inc esi
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dec edx
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jz @f
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shl al,1
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js .next
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inc ecx
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jmp @b
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@@:
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inc ecx
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.done:
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mov eax,ecx
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pop esi
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ret
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endp
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; draw text on 24bpp or 32bpp image
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; autofits text between 'x' and 'xSize'
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proc drawText, canvas, x, y, string, charQuantity, fontColor, params
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; [canvas]:
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; xSize dd ?
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; ySize dd ?
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; picture rb xSize * ySize * bpp
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; fontColor dd AARRGGBB
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; AA = alpha channel ; 0 = transparent, FF = non transparent
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; params dd ffeewwhh
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; hh = char height
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; ww = char width ; 0 = auto (proportional)
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; ee = encoding ; 1 = cp866, 2 = UTF-16LE, 3 = UTF-8
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; ff = flags ; 0001 = bold, 0010 = italic
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; 0100 = underline, 1000 = strike-through
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; 00010000 = align right, 00100000 = align center
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; 01000000 = set text area between higher and lower halfs of 'x'
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; 10000000 = 32bpp canvas insted of 24bpp
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; all flags combinable, except align right + align center
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; returns: eax = char width (0 = error), ecx = text start X
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pusha
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movzx eax,byte[params+1]
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test eax,eax
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jnz @f
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mov al ,byte[params]
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shr al ,1
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mov byte[params+1],al
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@@:
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cmp al, 22
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jc @f
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mov al, 21
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mov byte[params+1],21
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@@:
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inc [charQuantity]
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mul [charQuantity]
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mov ebx,eax
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mov esi,[canvas]
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mov esi,[esi]
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test byte[params+3],64
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jz .fit
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movzx eax,word[x]
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movzx ecx,word[x+2]
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cmp eax,ecx
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jnc @f
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xchg eax,ecx
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@@:
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mov [x],ecx
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cmp esi,eax
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jc .fit
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mov esi,eax
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.fit:
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mov eax,esi
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sub eax,[x]
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jnc @f
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popa
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xor eax,eax
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jmp .exit
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@@:
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cmp eax,ebx
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jnc @f
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mov ebx,eax
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div [charQuantity]
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mov byte[params+1],al
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sub ebx,edx
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@@:
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mov eax,esi
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sub eax,ebx
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test byte[params+3],32
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jz @f
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sub eax,[x]
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shr eax,1
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add [x],eax
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jmp .ok
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@@:
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test byte[params+3],16
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jz .ok
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mov [x],eax
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.ok:
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movzx eax,byte[params+1]
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lea eax,[eax*2+eax]
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shr eax,3
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test byte[params+1],7
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jz @f
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inc eax
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@@:
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mov ecx,eax
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push eax
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shl eax,3
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mul [charQuantity]
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shl ecx,4
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push ecx
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push eax
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mul ecx
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push eax
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lea ecx,[eax*4+8]
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mcall 68,12
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pop ecx
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popd [eax]
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popd [eax+4]
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push eax
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lea edi,[eax+8]
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xor eax,eax
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rep stosd
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pop edi
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pop ecx
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shl ecx,4
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mov ch, byte[params+2]
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shl ecx,22
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shr ecx,2
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dec ecx
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bts ecx,27
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mov esi,[charQuantity]
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dec esi
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xor ebx,ebx
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mcall 4,,,[string]
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xor eax,eax
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mov ebx,[edi]
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mov ecx,[edi+4]
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push edi
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add edi,8
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test byte[params+3],1
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jnz .bold
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movzx esi,byte[params]
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@@:
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pusha
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call verSub
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popa
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sub esi,16
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jg @b
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jmp @f
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.bold:
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imul ecx,ebx
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dec eax
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movzx ebx,byte[params+1]
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.loop:
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push edi
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push ecx
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call horAdd
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pop ecx
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pop edi
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sub ebx,8
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jg .loop
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@@:
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test byte[params+3],2
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jz @f
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mov edi,[esp]
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mov ecx,[edi]
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mov ebx,[edi+4]
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add edi,8
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mov esi,edi
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call italic
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@@:
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mov edi,[esp]
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mov eax,[edi]
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mov ebx,[edi+4]
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add edi,8
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mov esi,edi
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movzx edx,byte[params]
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call verScale
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mov eax,[charQuantity]
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mul byte[params+1]
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mov esi,[esp]
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mov edx,[esi]
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add esi,8
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mov edi,esi
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mov ebx,eax
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push eax
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movzx eax,byte[params]
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call ClearType
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test byte[params+3],4
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jz @f
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movzx eax,byte[params]
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movzx esi,byte[params+1]
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mov ebx,eax
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dec eax
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call drawLine
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@@:
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test byte[params+3],8
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jz @f
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movzx eax,byte[params]
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movzx esi,byte[params+1]
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mov ebx,eax
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shr eax,1
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call drawLine
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@@:
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mov esi,[canvas]
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mov eax,[esi]
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mul [y]
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add eax,[x]
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mov edi,eax
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mov eax,[esi]
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pop ecx
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sub eax,ecx
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mov ebx,[fontColor]
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movzx edx,byte[params]
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test byte[params+3],128
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mov ebp,3
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jnz @f
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lea edi,[edi*2+edi+8]
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lea eax,[eax*2+eax]
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jmp .go
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@@:
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lea edi,[edi*4+8]
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shl eax,2
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inc ebp
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.go:
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add edi,esi
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mov esi,[esp]
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add esi,8
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call putOnPicture
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pop ecx
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mcall 68,13
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popa
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movzx eax,byte[params+1]
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mov ecx,[x]
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.exit:
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ret
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endp
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drawLine:
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mov ecx,[esp+4]
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lea ecx,[ecx*2+ecx]
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mul ecx
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lea esi,[esi*2+esi]
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sub ecx,esi
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add esi,ecx
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add esi,ecx
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shr ecx,2
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add eax,[esp+8]
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lea edi,[eax+8]
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mov eax,-1
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@@:
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push ecx
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rep stosd
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sub edi,esi
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pop ecx
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sub ebx,16
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jg @b
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ret
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; make horizontal lines thinner
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; one color background only
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verSub:
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; edi -> buffer (32bpp)
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; eax = background color
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; ebx = width
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; ecx = height
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push ebp
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mov edx,ebx
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mov esi,edi
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mov ebp,ecx
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shl ebx,2
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.start:
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cmp [edi],eax
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jnz @f
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.loop:
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add edi,ebx
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dec ecx
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jnz .start
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jmp .next
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@@:
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mov [edi],eax
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@@:
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add edi,ebx
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dec ecx
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jz .next
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cmp [edi],eax
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jnz @b
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jmp .loop
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.next:
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add esi,4
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mov edi,esi
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mov ecx,ebp
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dec edx
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jnz .start
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pop ebp
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ret
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; make vertical lines thicker
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horAdd:
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; edi -> buffer (32bpp)
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; eax = font color
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; ecx = total number of pixels
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repnz scasd
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jcxz .end
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repz scasd
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mov [edi-4],eax
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jmp horAdd
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.end:
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ret
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; esi=edi supported (32bpp)
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italic:
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; esi -> source buffer
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; edi -> result buffer
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; ebx = height
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; ecx = width
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shl ecx,2
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shr ebx,2
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mov eax,ecx
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mul ebx
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shl eax,2
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add esi,eax
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add edi,eax
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dec ecx
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sub esi,8
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sub edi,4
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push ebx
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std
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@@:
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push ecx
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rep movsd
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pop ecx
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sub esi,4
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dec ebx
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jnz @b
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pop ecx
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mov eax,[edi+4]
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rep stosd
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cld
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ret
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; vertical downscale
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; white-black-gray only
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; esi=edi supported (32bpp)
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verScale:
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; esi -> source buffer
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; edi -> result buffer
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; eax = width
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; ebx = source height
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; edx = result height
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push ebp
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dec eax
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shl eax,2
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push eax
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add eax,4
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push edx
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push esi
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push edi
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push eax
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mov ecx,edx
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.scale:
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mov al, [esi]
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add esi,[esp]
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mul cl
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neg ecx
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add ecx,ebx
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mov ebp,eax
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mov al, [esi]
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@@:
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cmp edx,ecx
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jnc @f
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add esi,[esp]
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mul dl
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sub ecx,edx
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add ebp,eax
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mov al, [esi]
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jmp @b
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@@:
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mul cl
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add eax,ebp
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div bl
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mov [edi],al
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mov [edi+1],al
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mov [edi+2],al
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add edi,[esp]
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neg ecx
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add ecx,edx
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jnz @f
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add ecx,edx
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add esi,[esp]
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@@:
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dec dword[esp+12]
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jnz .scale
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mov edi,[esp+4]
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mov esi,[esp+8]
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mov [esp+12],edx
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add edi,[esp+16]
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add esi,[esp+16]
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sub dword[esp+16],4
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jnc .scale
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add esp,20
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pop ebp
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ret
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; horizontal downscale
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; minimum <20> x3, maximum <20> x6
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; white-black-gray only
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; esi=edi supported
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ClearType:
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; esi -> source buffer (32bpp)
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; edi -> result buffer (24bpp)
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; eax = height
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; edx = source width
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; ebx = result width
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push ebp
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lea ebx,[ebx*2+ebx]
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imul eax,ebx
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push eax
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push edi
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push eax
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push edx
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mov ecx,ebx
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.scale:
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movzx eax,byte[esi]
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add esi,4
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mul ecx
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neg ecx
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add ecx,[esp]
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mov ebp,eax
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movzx eax,byte[esi]
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cmp ebx,ecx
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jnc @f
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add esi,4
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mul ebx
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sub ecx,ebx
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add ebp,eax
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movzx eax,byte[esi]
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@@:
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mul ecx
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add eax,ebp
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div dword[esp]
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stosb
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neg ecx
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add ecx,ebx
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jnz @f
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add ecx,ebx
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add esi,4
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@@:
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dec dword[esp+4]
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jnz .scale
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pop edi
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pop edi
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mov edi,[esp]
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mov ecx,[esp+4]
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movzx ebx,byte[edi]
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xor eax,eax
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dec ecx
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.degradation:
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mov al, [edi]
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shl eax,1
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lea eax,[eax*2+eax]
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lea edx,[ebx*4+ebx]
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mov bl, [edi+1]
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add eax,edx
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lea edx,[ebx*4+ebx]
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mov bl, [edi]
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add eax,edx
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shr eax,4
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stosb
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dec ecx
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jnz .degradation
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pop edi
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pop ecx
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.colRev:
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mov al,[edi]
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xchg al,[edi+2]
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mov [edi],al
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add edi,3
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sub ecx,3
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jnz .colRev
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pop ebp
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ret
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; apply color on font, put font on picture
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; white font on black background only, smoothing allowed
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putOnPicture:
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; esi -> font buffer (24bpp)
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; edi -> picture buffer
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; ebx = font color
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; ecx = width
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; edx = height
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; eax = picture buffer line gap in bytes
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; ebp = picture buffer bytes per pixel
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push edx
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push eax
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push ecx
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push ebp
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xor eax,eax
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rol ebx,8
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mov ebp,ecx
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.start:
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cmp byte[esi], 0
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jz @f
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mov al, [esi]
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mul bl
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mov al, ah
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shr ah, 7
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add al, ah
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mov cl, 255
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sub cl, al
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mul bh
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mov edx,eax
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mov al, [edi]
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mul cl
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add eax,edx
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mov al, ah
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shr ah, 7
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add al, ah
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mov [edi],al
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@@:
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cmp byte[esi+1], 0
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jz @f
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mov al, [esi+1]
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mul bl
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mov al, ah
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shr ah, 7
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add al, ah
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mov cl, 255
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sub cl, al
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rol ebx,16
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mul bl
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rol ebx,16
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mov edx,eax
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mov al, [edi+1]
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mul cl
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add eax,edx
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mov al, ah
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shr ah, 7
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add al, ah
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mov [edi+1],al
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@@:
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cmp byte[esi+2], 0
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jz @f
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mov al, [esi+2]
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mul bl
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mov al, ah
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shr ah, 7
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add al, ah
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mov cl, 255
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sub cl, al
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rol ebx,16
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mul bh
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rol ebx,16
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mov edx,eax
|
||
mov al, [edi+2]
|
||
mul cl
|
||
add eax,edx
|
||
mov al, ah
|
||
shr ah, 7
|
||
add al, ah
|
||
mov [edi+2],al
|
||
@@:
|
||
add esi,3
|
||
add edi,[esp]
|
||
dec ebp
|
||
jnz .start
|
||
mov ebp,[esp+4]
|
||
add edi,[esp+8]
|
||
dec dword[esp+12]
|
||
jnz .start
|
||
add esp,16
|
||
ret
|
||
|
||
align 4
|
||
@EXPORT:
|
||
export drawText, 'drawText', \
|
||
countUTF8, 'cntUTF-8', \
|
||
charsFit, 'charsFit', \
|
||
stringWidth, 'strWidth'
|