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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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48
47-07.html
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@ -74,35 +74,35 @@ RightClipPlaneMask db 00fh,001h,003h,007h
.code
public _FillRectangleX
_FillRectangleX proc near
push bp ;preserve caller’s stack frame
push bp ;preserve caller’s stack frame
mov bp,sp ;point to local stack frame
push si ;preserve caller’s register variables
push si ;preserve caller’s register variables
push di
cld
mov ax,SCREEN_WIDTH
mul [bp+StartY] ;offset in page of top rectangle scan line
mov di,[bp+StartX]
mul [bp+StartY] ;offset in page of top rectangle scan line
mov di,[bp+StartX]
shr di,1 ;X/4 = offset of first rectangle pixel in scan
shr di,1 ; line
add di,ax ;offset of first rectangle pixel in page
add di,[bp+PageBase] ;offset of first rectangle pixel in
add di,[bp+PageBase] ;offset of first rectangle pixel in
; display memory
mov ax,SCREEN_SEG ;point ES:DI to the first rectangle
mov es,ax ; pixel’s address
mov es,ax ; pixel’s address
mov dx,SC_INDEX ;set the Sequence Controller Index to
mov al,MAP_MASK ; point to the Map Mask register
out dx,al
inc dx ;point DX to the SC Data register
mov si,[bp+StartX]
mov si,[bp+StartX]
and si,0003h ;look up left edge plane mask
mov bh,LeftClipPlaneMask[si]; to clip & put in BH
mov si,[bp+EndX]
mov si,[bp+EndX]
and si,0003h ;look up right edge plane
mov bl,RightClipPlaneMask[si]; mask to clip & put in BL
mov cx,[bp+EndX] ;calculate # of addresses across rect
mov si,[bp+StartX]
mov cx,[bp+EndX] ;calculate # of addresses across rect
mov si,[bp+StartX]
cmp cx,si
jle FillDone ;skip if 0 or negative width
dec cx
@ -110,15 +110,15 @@ _FillRectangleX proc near
sub cx,si
shr cx,1
shr cx,1 ;# of addresses across rectangle to fill - 1
jnz MasksSet ;there’s more than one byte to draw
and bh,bl ;there’s only one byte, so combine the left-
jnz MasksSet ;there’s more than one byte to draw
and bh,bl ;there’s only one byte, so combine the left-
; and right-edge clip masks
MasksSet:
mov si,[bp+EndY]
sub si,[bp+StartY] ;BX = height of rectangle
mov si,[bp+EndY]
sub si,[bp+StartY] ;BX = height of rectangle
jle FillDone ;skip if 0 or negative height
mov ah,byte ptr [bp+Color] ;color with which to fill
mov bp,SCREEN_WIDTH ;stack frame isn’t needed any more
mov ah,byte ptr [bp+Color] ;color with which to fill
mov bp,SCREEN_WIDTH ;stack frame isn’t needed any more
sub bp,cx ;distance from end of one scan line to start
dec bp ; of next
FillRowsLoop:
@ -128,7 +128,7 @@ FillRowsLoop:
mov al,ah ;put color in AL
stosb ;draw the left edge
dec cx ;count off left edge byte
js FillLoopBottom ;that’s the only byte
js FillLoopBottom ;that’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
@ -146,17 +146,17 @@ FillLoopBottom:
dec si ;count down scan lines
jnz FillRowsLoop
FillDone:
pop di ;restore caller’s register variables
pop di ;restore caller’s register variables
pop si
pop bp ;restore caller’s stack frame
pop bp ;restore caller’s stack frame
ret
_FillRectangleX endp
end
</PRE>
<!-- END CODE //-->
<P>Just so you can see Mode X in action, Listing 47.7 is a sample program that selects Mode X and draws a number of rectangles. Listing 47.7 links to any of the rectangle fill routines I&#146;ve presented.
<P>Just so you can see Mode X in action, Listing 47.7 is a sample program that selects Mode X and draws a number of rectangles. Listing 47.7 links to any of the rectangle fill routines I&rsquo;ve presented.
</P>
<P>And now, I hope, you&#146;re beginning to see why I&#146;m so fond of Mode X. In the next chapter, we&#146;ll continue with Mode X by exploring the wonders that the latches and parallel plane hardware can work on scrolls, copies, blits, and pattern fills.</P>
<P>And now, I hope, you&rsquo;re beginning to see why I&rsquo;m so fond of Mode X. In the next chapter, we&rsquo;ll continue with Mode X by exploring the wonders that the latches and parallel plane hardware can work on scrolls, copies, blits, and pattern fills.</P>
<P><B>LISTING 47.7 L47-7.C</B></P>
<!-- CODE //-->
<PRE>
@ -175,9 +175,9 @@ void main() {
Set320x240Mode();
FillRectangleX(0,0,320,240,0,0); /* clear the screen to black */
for (j = 1; j &lt; 220; j &#43;= 21) {
for (i = 1; i &lt; 300; i &#43;= 21) {
FillRectangleX(i, j, i&#43;20, j&#43;20, 0, ((j/21*15)&#43;i/21) & 0xFF);
for (j = 1; j &lt; 220; j += 21) {
for (i = 1; i &lt; 300; i += 21) {
FillRectangleX(i, j, i+20, j+20, 0, ((j/21*15)+i/21) & 0xFF);
}
}
getch();