Replace invalid characters with HTML entities
— 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
parent
9e52de9586
commit
500e7f5654
353 changed files with 5091 additions and 5091 deletions
32
57-03.html
32
57-03.html
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@ -74,7 +74,7 @@ SourceX dd ? ;X location in source for this edge
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SourceY dd ? ;Y location in source for this edge
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SourceStepX dd ? ;X step in source for Y step in dest of 1
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SourceStepY dd ? ;Y step in source for Y step in dest of 1
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;variables used for all-integer Bresenham’s-type
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;variables used for all-integer Bresenham’s-type
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; X stepping through the dest, needed for precise
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; pixel placement to avoid gaps
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DestX dw ? ;current X location in dest for this edge
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@ -114,10 +114,10 @@ ToScanDone:
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public -ScanOutLine
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align 2
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-ScanOutLine proc near
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push bp ;preserve caller’s stack frame
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push bp ;preserve caller’s stack frame
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mov bp,sp ;point to our stack frame
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sub sp,LOCAL-SIZE ;allocate space for local variables
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push si ;preserve caller’s register variables
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push si ;preserve caller’s register variables
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push di
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; Nothing to do if destination is fully X clipped.
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mov di,[bp].RightEdge
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@ -162,7 +162,7 @@ ToScanDone:
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cmp ax,0 ;is the whole step exactly an integer?
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jz SourceXNonNeg ;yes
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inc dx ;no, truncate to integer in the direction of
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; 0, because otherwise we’ll end up with a
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; 0, because otherwise we’ll end up with a
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; whole step of 1-too-large magnitude
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SourceXNonNeg:
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mov [bp].lXAdvanceByOne,cx ;amount to add to source pointer to
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@ -190,7 +190,7 @@ SourceXNonNeg:
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cmp ax,0 ;is the whole step exactly an integer?
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jz SourceYNonNeg ;yes
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inc dx ;no, truncate to integer in the direction of
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; 0, because otherwise we’ll end up with a
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; 0, because otherwise we’ll end up with a
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; whole step of 1-too-large magnitude
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SourceYNonNeg:
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mov [bp].lYAdvanceByOne,cx ;amount to add to source pointer to
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@ -199,9 +199,9 @@ SourceYNonNeg:
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imul dx ; image bitmap when Y steps (ignoring
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mov [bp].lYBaseAdvance,ax ; carry from the fractional part)
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; Advance 1/2 step in the stepping direction, to space scanned pixels evenly
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; between the left and right edges. (There’s a slight inaccuracy in dividing
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; between the left and right edges. (There’s a slight inaccuracy in dividing
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; negative numbers by 2 by shifting rather than dividing, but the inaccuracy
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; is in the least significant bit, and we’ll just live with it.)
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; is in the least significant bit, and we’ll just live with it.)
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mov ax,word ptr [bp].lSourceStepX
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mov dx,word ptr [bp].lSourceStepX+2
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sar dx,1
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@ -277,13 +277,13 @@ LeftEdgeClipped:
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add di,[-CurrentPageBase] ;offset of pixel in display memory
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;ES:DI now points to the first destination pixel
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and cl,011b ;CL = pixel’s plane
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and cl,011b ;CL = pixel’s plane
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mov al,MAP-MASK
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mov dx,SC-INDEX
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out dx,al ;point the SC Index register to the Map Mask
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mov al,11h ;one plane bit in each nibble, so we’ll get carry
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mov al,11h ;one plane bit in each nibble, so we’ll get carry
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; automatically when going from plane 3 to plane 0
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shl al,cl ;set the bit for the first pixel’s plane to 1
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shl al,cl ;set the bit for the first pixel’s plane to 1
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; If source X step is negative, change over to working with non-negative
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; values.
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cmp word ptr [bp].lXAdvanceByOne,0
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@ -299,13 +299,13 @@ SXStepSet:
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not word ptr [bp].lSourceY
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SYStepSet:
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; At this point:
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; AL = initial pixel’s plane mask
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; AL = initial pixel’s plane mask
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; BX = pointer to initial image pixel
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; SI = # of pixels to fill
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; DI = pointer to initial destination pixel
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mov dx,SC-INDEX+1 ;point to SC Data; Index points to Map Mask
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TexScanLoop:
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; Set the Map Mask for this pixel’s plane, then draw the pixel.
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; Set the Map Mask for this pixel’s plane, then draw the pixel.
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out dx,al
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mov ah,[bx] ;get image pixel
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mov es:[di],ah ;set image pixel
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@ -313,13 +313,13 @@ TexScanLoop:
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add bx,[bp].lXBaseAdvance ;advance the minimum # of pixels in X
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mov cx,word ptr [bp].lSourceStepX
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add word ptr [bp].lSourceX,cx;step the source X fractional part
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jnc NoExtraXAdvance ;didn’t turn over; no extra advance
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jnc NoExtraXAdvance ;didn’t turn over; no extra advance
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add bx,[bp].lXAdvanceByOne ;did turn over; advance X one extra
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NoExtraXAdvance:
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add bx,[bp].lYBaseAdvance;advance the minimum # of pixels in Y
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mov cx,word ptr [bp].lSourceStepY
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add word ptr [bp].lSourceY,cx;step the source Y fractional part
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jnc NoExtraYAdvance;didn’t turn over; no extra advance
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jnc NoExtraYAdvance;didn’t turn over; no extra advance
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add bx,[bp].lYAdvanceByOne;did turn over; advance Y one extra
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NoExtraYAdvance:
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; Point to the next destination pixel, by cycling to the next plane, and
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@ -330,10 +330,10 @@ NoExtraYAdvance:
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dec si
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jnz TexScanLoop
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ScanDone:
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pop di ;restore caller’s register variables
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pop di ;restore caller’s register variables
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pop si
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mov sp,bp ;deallocate local variables
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pop bp ;restore caller’s stack frame
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pop bp ;restore caller’s stack frame
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ret
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-ScanOutLine endp
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end
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