mirror of https://github.com/nmlgc/ReC98.git
196 lines
3.0 KiB
NASM
196 lines
3.0 KiB
NASM
PAGE 98,120
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; graphics - grcg - round - boxfill - PC98V
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;
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; DESCRIPTION:
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; 角の丸い四角形塗りつぶし (level 2)
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;
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; FUNCTION:
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; void far _pascal grcg_round_boxfill( int x1, int y1, int x2, int y2, unsigned r ) ;
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; PARAMETERS:
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; int x1,y1 左上角の座標
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; int x2,y2 右下角の座標
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; unsigned r 四隅の円の半径
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;
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; BINDING TARGET:
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; Microsoft-C / Turbo-C
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;
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; RUNNING TARGET:
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; NEC PC-9801 Normal mode
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;
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; REQUIRING RESOURCES:
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; CPU: V30
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; GRAPHICS ACCELARATOR: GRAPHIC CHARGER
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;
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; COMPILER/ASSEMBLER:
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; TASM 3.0
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; OPTASM 1.6
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;
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; NOTES:
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; ・描画規則はgrcg_hline, grcg_boxfillに依存しています。
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; ・色をつけるには、グラフィックチャージャーを利用してください。
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; ・grc_setclip()によるクリッピングに対応しています。
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;
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; AUTHOR:
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; 恋塚昭彦
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;
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; 関連関数:
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; grc_setclip()
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; grcg_hline(), grcg_boxfill()
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;
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; HISTORY:
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; 93/ 3/ 1 Initial
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MRETURN macro
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pop DI
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pop SI
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leave
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ret 10
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endm
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; 引数
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x1 = (RETSIZE+5)*2
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y1 = (RETSIZE+4)*2
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x2 = (RETSIZE+3)*2
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y2 = (RETSIZE+2)*2
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r = (RETSIZE+1)*2
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retfunc GC_RBOXF_BOXFILL
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push word ptr [BP+x1]
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push word ptr [BP+y1]
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push word ptr [BP+x2]
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push word ptr [BP+y2]
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call GRCG_BOXFILL
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MRETURN
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endfunc
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func GRCG_ROUND_BOXFILL ; {
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enter 2,0
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push SI
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push DI
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; 変数
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s = -2
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mov AX,[BP+r]
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mov BX,[BP+x1]
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mov SI,[BP+x2]
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cmp BX,SI
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jle short @@SKIP1
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xchg BX,SI
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mov [BP+x1],BX
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mov [BP+x2],SI
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@@SKIP1:
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sub SI,BX
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shr SI,1 ; SI = abs(x2 - x1) / 2
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sub AX,SI ; AX = min(AX,SI)
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sbb DX,DX
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and AX,DX
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add AX,SI
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mov CX,[BP+y1]
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mov DI,[BP+y2]
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cmp CX,DI
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jle short @@SKIP2
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xchg CX,DI
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@@SKIP2:
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mov BX,DI ; BX = max(y1,y2)
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sub DI,CX
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shr DI,1 ; DI = abs(y2 - y1) / 2
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sub AX,DI ; AX = min(AX,DI)
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sbb DX,DX
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and AX,DX
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add AX,DI
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jz short GC_RBOXF_BOXFILL ; 半径が 0 になったら長方形になる
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mov [BP+s],AX
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add CX,AX ; y1,y2を内側へずらす
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sub BX,AX
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mov [BP+y1],CX
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mov [BP+y2],BX
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mov SI,AX ; SI = wx
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inc CX
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dec BX
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cmp BX,CX
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jl short @@SKIP_BOXFILL
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push word ptr [BP+x1]
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push CX
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push word ptr [BP+x2]
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push BX
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call GRCG_BOXFILL
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@@SKIP_BOXFILL:
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add [BP+x1],SI
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sub [BP+x2],SI
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mov DI,0 ; DI = wy
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@@LOOP_8:
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mov AX,[BP+x1]
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sub AX,SI
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push AX ; x1 - wx
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mov AX,[BP+x2]
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add AX,SI
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push AX ; x2 + wx
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mov AX,[BP+y1]
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sub AX,DI ; y1 - wy
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push AX
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call GRCG_HLINE
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mov AX,[BP+x1]
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sub AX,SI
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push AX ; x1 - wx
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mov AX,[BP+x2]
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add AX,SI
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push AX ; x2 + wx
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mov AX,[BP+y2]
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add AX,DI ; y1 + wy
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push AX
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call GRCG_HLINE
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mov AX,DI
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stc
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rcl AX,1 ; (wy << 1) + 1
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sub [BP+s],AX
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jns short @@LOOP_8E
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mov AX,[BP+x1]
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sub AX,DI
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push AX ; x1 - wy
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mov AX,[BP+x2]
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add AX,DI
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push AX ; x2 + wy
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mov AX,[BP+y1]
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sub AX,SI ; y1 - wx
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push AX
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call GRCG_HLINE
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mov AX,[BP+x1]
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sub AX,DI
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push AX ; x1 - wy
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mov AX,[BP+x2]
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add AX,DI
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push AX ; x2 + wy
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mov AX,[BP+y2]
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add AX,SI ; y1 + wx
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push AX
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call GRCG_HLINE
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dec SI ; s += --wx << 1 ;
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mov AX,SI
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shl AX,1
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add [BP+s],AX
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@@LOOP_8E:
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inc DI
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cmp SI,DI
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jae short @@LOOP_8
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MRETURN
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endfunc ; }
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