;---------------------------- Include File Header ---------------------------;
; Module Name: lines.inc
;
; Line drawing constants and structures.
;
; NOTE: This file mirrors LINES.H.  Changes here must be reflected in
; the .h file!
;
; Copyright (c) 1993-1995 Microsoft Corporation
;----------------------------------------------------------------------------;

; We have special strip routines when all strips have at most this many
; pixels:

MAX_SHORT_STROKE_LENGTH equ 15

; # of strip drawers in every group:

NUM_STRIP_DRAW_DIRECTIONS equ 4

; # of strip drawers for doing either solid lines or styled lines:

NUM_STRIP_DRAW_STYLES equ 8

STYLE_MAX_COUNT         equ 16
STYLE_MAX_VALUE         equ 3fffh
RUN_MAX                 equ 20
STRIP_MAX               equ 100
STYLE_DENSITY           equ 3

; Flip and round flags:

FL_H_ROUND_DOWN         equ 00000080h   ; Set if x = 1/2 rounds to x = 1
FL_V_ROUND_DOWN         equ 00008000h   ; Set if y = 1/2 rounds to y = 1

FL_FLIP_D               equ 00000005h   ; Diagonal flip
FL_FLIP_V               equ 00000008h   ; Vertical flip
FL_FLIP_SLOPE_ONE       equ 00000010h   ; If slope is exactly one
FL_FLIP_HALF            equ 00000002h   ; Half flip
FL_FLIP_H               equ 00000200h   ; Horizontal (right-to-left) exchange

FL_ROUND_MASK           equ 0000001ch   ; Rounding is dependent on diagonal,
FL_ROUND_SHIFT          equ 2           ;  vertical flips and if slope is one

FL_RECTLCLIP_MASK       equ 0000000ch   ; When we unflip to do clipping, we
FL_RECTLCLIP_SHIFT      equ 2           ;  only have to look at diagonal and
                                        ;  vertical flips

FL_STRIP_MASK           equ 00000003h   ; Which strip drawer we call is based
FL_STRIP_SHIFT          equ 0           ;  on if we did diagonal and/or half
                                        ;  flips

FL_SIMPLE_CLIP          equ 00000020h   ; Denotes our clipping complexity
FL_COMPLEX_CLIP         equ 00000040h
FL_CLIP                 equ (FL_SIMPLE_CLIP + FL_COMPLEX_CLIP)

FL_STYLED               equ 00000400h   ; If the line is styled

FL_LAST_PEL_INCLUSIVE   equ 00002000h   ; If the line is last-pel inclusive

; Miscellaneous DDA defines:

F                       equ 16
FLOG2                   equ 4

;------------------------------------------------------------------------
; NOTE: The following structures must exactly match those declared in
;       lines.h!

STRIPS struc
    ST_cStrips	        dd  ?
    ST_flFlips          dd  ?
    ST_ptlStart         dd  2 dup(?)
    ST_alStrips	        dd  STRIP_MAX dup (?)
STRIPS ends

LINESTATE struc
    LS_pspStart         dd  ?
    LS_pspEnd           dd  ?
    LS_psp              dd  ?
    LS_spRemaining      dd  ?
    LS_spTotal          dd  ?
    LS_spTotal2         dd  ?
    LS_spNext           dd  ?
    LS_spComplex        dd  ?
    LS_aspRtoL          dd  ?
    LS_aspLtoR          dd  ?
    LS_jStyleMask       db  ?
    LS_filler2          db  3 dup (?)
    LS_xyDensity        dd  ?
    LS_cStyle           dd  ?
    LS_ulStyleMaskLtoR  dd  ?
    LS_ulStyleMaskRtoL  dd  ?
    LS_jStartMask       db  ?
    LS_filler3          db  3 dup (?)
LINESTATE ends

RUN struc
    RUN_iStart          dd  ?
    RUN_iStop           dd  ?
RUN ends

DEFAULT_DRAW_CMD	    equ (DRAW_LINE+DRAW+DIR_TYPE_XY+MULTIPLE_PIXELS+WRITE+ \
                             LAST_PIXEL_OFF)