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transfer.asm
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Assembly Source File
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1992-09-03
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6KB
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173 lines
*
* Copyright (c) 1992 Commodore-Amiga, Inc.
*
* This example is provided in electronic form by Commodore-Amiga, Inc. for
* use with the "Amiga ROM Kernel Reference Manual: Devices", 3rd Edition,
* published by Addison-Wesley (ISBN 0-201-56775-X).
*
* The "Amiga ROM Kernel Reference Manual: Devices" contains additional
* information on the correct usage of the techniques and operating system
* functions presented in these examples. The source and executable code
* of these examples may only be distributed in free electronic form, via
* bulletin board or as part of a fully non-commercial and freely
* redistributable diskette. Both the source and executable code (including
* comments) must be included, without modification, in any copy. This
* example may not be published in printed form or distributed with any
* commercial product. However, the programming techniques and support
* routines set forth in these examples may be used in the development
* of original executable software products for Commodore Amiga computers.
*
* All other rights reserved.
*
* This example is provided "as-is" and is subject to change; no
* warranties are made. All use is at your own risk. No liability or
* responsibility is assumed.
*
**********************************************************************
*
* Transfer routine for HP_LaserJet
*
**********************************************************************
INCLUDE "exec/types.i"
INCLUDE "intuition/intuition.i"
INCLUDE "devices/printer.i"
INCLUDE "devices/prtbase.i"
INCLUDE "devices/prtgfx.i"
XREF _PD
XDEF _Transfer
SECTION printer,CODE
_Transfer:
; Transfer(PInfo, y, ptr)
; struct PrtInfo *PInfo 4-7
; UWORD y; 8-11
; UBYTE *ptr; 12-15
;
movem.l d2-d6/a2-a3,-(sp) ;save regs used
movea.l 32(sp),a0 ;a0 = PInfo
move.l 36(sp),d0 ;d0 = y
movea.l 40(sp),a1 ;a1 = ptr
move.w pi_width(a0),d1 ;d1 = width
subq.w #1,d1 ;adjust for dbra
move.w pi_threshold(a0),d3 ;d3 = threshold, thresholding?
beq.s grey_scale ;no, grey-scale
threshold:
; a0 - PInfo
; a1 - ptr
; d0 - y
; d1 - width
; d3 - threshold
eori.b #15,d3 ;d3 = dvalue
movea.l pi_ColorInt(a0),a2 ;a2 = ColorInt ptr
move.w pi_xpos(a0),d2 ;d2 = x
movea.l pi_ScaleX(a0),a0 ;a0 = ScaleX (sxptr)
; a0 - sxptr
; a1 - ptr
; a2 - ColorInt ptr
; a3 - dmatrix ptr (NOT USED)
; d0 - byte to set (x >> 3)
; d1 - width
; d2 - x
; d3 - dvalue
; d4 - Black
; d5 - sx
; d6 - bit to set
twidth_loop:
move.b PCMBLACK(a2),d4 ;d4 = Black
addq.l #ce_SIZEOF,a2 ;advance to next entry
move.w (a0)+,d5 ;d5 = # of times to use this pixel (sx)
cmp.b d3,d4 ;render this pixel?
ble.s tsx_end ;no, skip to next pixel.
subq.w #1,d5 ;adjust for dbra
tsx_render: ;yes, render this pixel sx times
move.w d2,d0
lsr.w #3,d0 ;compute byte to set
move.w d2,d6
not.w d6 ;compute bit to set
bset.b d6,0(a1,d0.w) ;*(ptr + x >> 3) |= 2 ^ x
addq.w #1,d2 ;x++
dbra d5,tsx_render ;sx--
dbra d1,twidth_loop ;width--
bra.s exit ;all done
tsx_end:
add.w d5,d2 ;x += sx
dbra d1,twidth_loop ;width--
bra.s exit
grey_scale:
; a0 - PInfo
; a1 - ptr
; d0 - y
; d1 - width
movea.l pi_ColorInt(a0),a2 ;a2 = ColorInt ptr
moveq.l #3,d2
and.w d0,d2 ;d2 = y & 3
lsl.w #2,d2 ;d2 = (y & 3) << 2
movea.l pi_dmatrix(a0),a3 ;a3 = dmatrix
adda.l d2,a3 ;a3 = dmatrix + ((y & 3) << 2)
move.w pi_xpos(a0),d2 ;d2 = x
movea.l pi_ScaleX(a0),a0 ;a0 = ScaleX (sxptr)
; a0 - sxptr
; a1 - ptr
; a2 - ColorInt ptr
; a3 - dmatrix ptr
; d0 - byte to set (x >> 3)
; d1 - width
; d2 - x
; d3 - dvalue (dmatrix[x & 3])
; d4 - Black
; d5 - sx
; d6 - bit to set
gwidth_loop:
move.b PCMBLACK(a2),d4 ;d4 = Black
addq.l #ce_SIZEOF,a2 ;advance to next entry
move.w (a0)+,d5 ;d5 = # of times to use this pixel (sx)
subq.w #1,d5 ;adjust for dbra
gsx_loop:
moveq.l #3,d3
and.w d2,d3 ;d3 = x & 3
move.b 0(a3,d3.w),d3 ;d3 = dmatrix[x & 3]
cmp.b d3,d4 ;render this pixel?
ble.s gsx_end ;no, skip to next pixel.
move.w d2,d0
lsr.w #3,d0 ;compute byte to set
move.w d2,d6
not.w d6 ;compute bit to set
bset.b d6,0(a1,d0.w) ;*(ptr + x >> 3) |= 2 ^ x
gsx_end
addq.w #1,d2 ;x++
dbra d5,gsx_loop ;sx--
dbra d1,gwidth_loop ;width--
exit:
movem.l (sp)+,d2-d6/a2-a3 ;restore regs used
moveq.l #0,d0 ;flag all ok
rts ;goodbye
END