Misc/abrash-black-book
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Replace invalid characters with HTML entities

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— with —
’ with ’
+ with +
× with x
ç with ç
“ with “
” with ”
‘ with ‘
• with •
– with -
µ with µ
† with †
Fix C++
θ with θ
Yen symbol instead of times
Fix broken apos
Bullet again
E-circumflex
This commit is contained in:
James Gregory 2013-12-30 12:50:32 +11:00
commit 500e7f5654
353 changed files with 5091 additions and 5091 deletions
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36
50-03.html
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@ -40,7 +40,7 @@
<!-- CODE //-->
<PRE>
; Draws all pixels in the list of horizontal lines passed in, in
; Mode X, the VGA&#146;s undocumented 320x240 256-color mode. Clips to
; Mode X, the VGA&rsquo;s undocumented 320x240 256-color mode. Clips to
; the rectangle specified by (ClipMinX,ClipMinY),(ClipMaxX,ClipMaxY).
; Draws to the page specified by CurrentPageBase.
; C near-callable as:
@ -85,9 +85,9 @@ ToFillDone:
public _DrawHorizontalLineList
align 2
_DrawHorizontalLineList proc
push bp ;preserve caller&#146;s stack frame
push bp ;preserve caller&rsquo;s stack frame
mov bp,sp ;point to our stack frame
push si ;preserve caller&#146;s register variables
push si ;preserve caller&rsquo;s register variables
push di
cld ;make string instructions inc pointers
mov dx,SC_INDEX
@ -95,13 +95,13 @@ _DrawHorizontalLineList proc
out dx,al ;point SC Index to the Map Mask
mov ax,SCREEN_SEGMENT
mov es,ax ;point ES to display memory for REP STOS
mov si,[bp&#43;HLineListPtr] ;point to the line list
mov bx,[si&#43;HLinePtr] ;point to the XStart/XEnd descriptor
mov si,[bp+HLineListPtr] ;point to the line list
mov bx,[si+HLinePtr] ;point to the XStart/XEnd descriptor
; for the first (top) horizontal line
mov cx,[si&#43;YStart] ;first scan line to draw
mov si,[si&#43;Lngth] ;# of scan lines to draw
mov cx,[si+YStart] ;first scan line to draw
mov si,[si+Lngth] ;# of scan lines to draw
cmp si,0 ;are there any lines to draw?
jle ToFillDone ;no, so we&#146;re done
jle ToFillDone ;no, so we&rsquo;re done
cmp cx,[_ClipMinY] ;clipped at top?
jge MinYNotClipped ;no
neg cx ;yes, discard however many lines are
@ -114,7 +114,7 @@ _DrawHorizontalLineList proc
mov cx,[_ClipMinY] ;start at the top clip line
MinYNotClipped:
mov dx,si
add dx,cx ;bottom row to draw &#43; 1
add dx,cx ;bottom row to draw + 1
cmp dx,[_ClipMaxY] ;clipped at bottom?
jle MaxYNotClipped ;no
sub dx,[_ClipMaxY] ;# of lines to clip off the bottom
@ -125,18 +125,18 @@ MaxYNotClipped:
mul cx ; scan line on which to draw
add ax,[_CurrentPageBase] ;offset of first line
mov dx,ax ;ES:DX points to first scan line to draw
mov ah,byte ptr [bp&#43;Color] ;color with which to fill
mov ah,byte ptr [bp+Color] ;color with which to fill
FillLoop:
push bx ;remember line list location
push dx ;remember offset of start of line
push si ;remember # of lines to draw
mov di,[bx&#43;XStart] ;left edge of fill on this line
mov di,[bx+XStart] ;left edge of fill on this line
cmp di,[_ClipMinX] ;clipped to left edge?
jge MinXNotClipped ;no
mov di,[_ClipMinX] ;yes, clip to the left edge
MinXNotClipped:
mov si,di
mov cx,[bx&#43;XEnd] ;right edge of fill
mov cx,[bx+XEnd] ;right edge of fill
cmp cx,[_ClipMaxX] ;clipped to right edge?
jl MaxXNotClipped ;no
mov cx,[_ClipMaxX] ;yes, clip to the right edge
@ -157,18 +157,18 @@ MaxXNotClipped:
sub cx,dx
shr cx,1
shr cx,1 ;# of addresses across rectangle to fill - 1
jnz MasksSet ;there&#146;s more than one byte to draw
and bh,bl ;there&#146;s only one byte, so combine the left
jnz MasksSet ;there&rsquo;s more than one byte to draw
and bh,bl ;there&rsquo;s only one byte, so combine the left
; and right edge clip masks
MasksSet:
mov dx,SC_INDEX&#43;1 ;already points to the Map Mask reg
mov dx,SC_INDEX+1 ;already points to the Map Mask reg
FillRowsLoop:
mov al,bh ;put left-edge clip mask in AL
out dx,al ;set the left-edge plane (clip) mask
mov al,ah ;put color in AL
stosb ;draw the left edge
dec cx ;count off left edge byte
js FillLoopBottom ;that&#146;s the only byte
js FillLoopBottom ;that&rsquo;s the only byte
jz DoRightEdge ;there are only two bytes
mov al,00fh ;middle addresses are drawn 4 pixels at a pop
out dx,al ;set the middle pixel mask to no clip
@ -189,9 +189,9 @@ LineFillDone:
dec si ;count down lines
jnz FillLoop
FillDone:
pop di ;restore caller&#146;s register variables
pop di ;restore caller&rsquo;s register variables
pop si
pop bp ;restore caller&#146;s stack frame
pop bp ;restore caller&rsquo;s stack frame
ret
_DrawHorizontalLineList endp
end