mirror of
https://github.com/reactos/reactos.git
synced 2024-11-20 14:30:57 +00:00
406 lines
10 KiB
C
406 lines
10 KiB
C
/*
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* PROJECT: ReactOS VGA display driver
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: win32ss/drivers/displays/vga/objects/lineto.c
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* PURPOSE:
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* PROGRAMMERS: Copyright (C) 1998-2003 ReactOS Team
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*/
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#include <vgaddi.h>
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/*
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* Draw a line from top-left to bottom-right
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*/
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static void FASTCALL
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vgaNWtoSE(
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IN CLIPOBJ* Clip,
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IN BRUSHOBJ* Brush,
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IN LONG x,
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IN LONG y,
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IN LONG deltax,
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IN LONG deltay)
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{
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int i;
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int error;
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BOOLEAN EnumMore;
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PRECTL ClipRect;
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RECT_ENUM RectEnum;
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ULONG Pixel = Brush->iSolidColor;
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LONG delta;
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CLIPOBJ_cEnumStart(Clip, FALSE, CT_RECTANGLES, CD_RIGHTDOWN, 0);
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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delta = max(deltax, deltay);
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i = 0;
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error = delta / 2;
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while (i < delta && (ClipRect < RectEnum.arcl + RectEnum.c || EnumMore))
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{
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while ((ClipRect < RectEnum.arcl + RectEnum.c /* there's still a current clip rect */
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&& (ClipRect->bottom <= y /* but it's above us */
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|| (ClipRect->top <= y && ClipRect->right <= x))) /* or to the left of us */
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|| EnumMore) /* no current clip rect, but rects left */
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{
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/* Skip to the next clip rect */
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if (RectEnum.arcl + RectEnum.c <= ClipRect)
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{
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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}
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else
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{
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ClipRect++;
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}
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}
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if ( ClipRect < RectEnum.arcl + RectEnum.c ) /* If there's no current clip rect we're done */
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{
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if (ClipRect->left <= x && ClipRect->top <= y)
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vgaPutPixel ( x, y, Pixel );
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if ( deltax < deltay )
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{
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y++;
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error += deltax;
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if ( error >= deltay )
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{
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x++;
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error -= deltay;
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}
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}
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else
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{
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x++;
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error += deltay;
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if ( error >= deltax )
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{
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y++;
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error -= deltax;
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}
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}
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i++;
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}
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}
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}
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static void FASTCALL
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vgaSWtoNE(
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IN CLIPOBJ* Clip,
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IN BRUSHOBJ* Brush,
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IN LONG x,
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IN LONG y,
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IN LONG deltax,
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IN LONG deltay)
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{
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int i;
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int error;
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BOOLEAN EnumMore;
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PRECTL ClipRect;
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RECT_ENUM RectEnum;
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ULONG Pixel = Brush->iSolidColor;
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LONG delta;
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CLIPOBJ_cEnumStart(Clip, FALSE, CT_RECTANGLES, CD_RIGHTUP, 0);
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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delta = max(deltax, deltay);
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i = 0;
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error = delta / 2;
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while (i < delta && (ClipRect < RectEnum.arcl + RectEnum.c || EnumMore))
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{
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while ((ClipRect < RectEnum.arcl + RectEnum.c
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&& (y < ClipRect->top
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|| (y < ClipRect->bottom && ClipRect->right <= x)))
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|| EnumMore)
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{
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if (RectEnum.arcl + RectEnum.c <= ClipRect)
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{
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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}
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else
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{
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ClipRect++;
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}
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}
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if (ClipRect < RectEnum.arcl + RectEnum.c)
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{
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if (ClipRect->left <= x && y < ClipRect->bottom)
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vgaPutPixel(x, y, Pixel);
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if (deltax < deltay)
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{
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y--;
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error = error + deltax;
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if (deltay <= error)
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{
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x++;
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error = error - deltay;
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}
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}
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else
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{
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x++;
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error = error + deltay;
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if (deltax <= error)
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{
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y--;
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error = error - deltax;
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}
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}
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i++;
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}
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}
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}
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static void FASTCALL
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vgaNEtoSW(
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IN CLIPOBJ* Clip,
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IN BRUSHOBJ* Brush,
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IN LONG x,
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IN LONG y,
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IN LONG deltax,
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IN LONG deltay)
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{
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int i;
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int error;
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BOOLEAN EnumMore;
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PRECTL ClipRect;
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RECT_ENUM RectEnum;
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ULONG Pixel = Brush->iSolidColor;
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LONG delta;
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CLIPOBJ_cEnumStart(Clip, FALSE, CT_RECTANGLES, CD_LEFTDOWN, 0);
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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delta = max(deltax, deltay);
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i = 0;
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error = delta / 2;
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while (i < delta && (ClipRect < RectEnum.arcl + RectEnum.c || EnumMore))
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{
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while ((ClipRect < RectEnum.arcl + RectEnum.c
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&& (ClipRect->bottom <= y
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|| (ClipRect->top <= y && x < ClipRect->left)))
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|| EnumMore)
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{
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if (RectEnum.arcl + RectEnum.c <= ClipRect)
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{
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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}
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else
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{
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ClipRect++;
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}
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}
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if (ClipRect < RectEnum.arcl + RectEnum.c)
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{
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if (x < ClipRect->right && ClipRect->top <= y)
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vgaPutPixel(x, y, Pixel);
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if (deltax < deltay)
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{
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y++;
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error = error + deltax;
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if (deltay <= error)
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{
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x--;
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error = error - deltay;
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}
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}
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else
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{
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x--;
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error = error + deltay;
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if (deltax <= error)
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{
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y++;
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error = error - deltax;
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}
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}
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i++;
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}
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}
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}
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static void FASTCALL
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vgaSEtoNW(
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IN CLIPOBJ* Clip,
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IN BRUSHOBJ* Brush,
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IN LONG x,
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IN LONG y,
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IN LONG deltax,
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IN LONG deltay)
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{
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int i;
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int error;
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BOOLEAN EnumMore;
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PRECTL ClipRect;
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RECT_ENUM RectEnum;
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ULONG Pixel = Brush->iSolidColor;
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LONG delta;
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CLIPOBJ_cEnumStart(Clip, FALSE, CT_RECTANGLES, CD_LEFTUP, 0);
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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delta = max(deltax, deltay);
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i = 0;
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error = delta / 2;
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while (i < delta && (ClipRect < RectEnum.arcl + RectEnum.c || EnumMore))
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{
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while ((ClipRect < RectEnum.arcl + RectEnum.c
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&& (y < ClipRect->top
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|| (y < ClipRect->bottom && x < ClipRect->left)))
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|| EnumMore)
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{
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if (RectEnum.arcl + RectEnum.c <= ClipRect)
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{
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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ClipRect = RectEnum.arcl;
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}
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else
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{
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ClipRect++;
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}
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}
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if (ClipRect < RectEnum.arcl + RectEnum.c)
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{
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if (x < ClipRect->right && y < ClipRect->bottom)
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vgaPutPixel(x, y, Pixel);
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if (deltax < deltay)
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{
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y--;
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error = error + deltax;
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if (deltay <= error)
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{
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x--;
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error = error - deltay;
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}
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}
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else
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{
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x--;
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error = error + deltay;
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if (deltax <= error)
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{
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y--;
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error = error - deltax;
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}
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}
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i++;
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}
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}
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}
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/*
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* FIXME: Use Mix to perform ROPs
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* FIXME: Non-solid Brush
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*/
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BOOL APIENTRY
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DrvLineTo(
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IN SURFOBJ *DestObj,
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IN CLIPOBJ *Clip,
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IN BRUSHOBJ *Brush,
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IN LONG x1,
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IN LONG y1,
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IN LONG x2,
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IN LONG y2,
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IN RECTL *RectBounds,
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IN MIX mix)
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{
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LONG x, y, deltax, deltay, xchange, ychange, hx, vy;
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ULONG i;
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ULONG Pixel = Brush->iSolidColor;
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RECT_ENUM RectEnum;
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BOOL EnumMore;
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x = x1;
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y = y1;
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deltax = x2 - x1;
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deltay = y2 - y1;
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if (deltax < 0)
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{
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xchange = -1;
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deltax = - deltax;
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hx = x2+1;
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//x--;
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}
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else
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{
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xchange = 1;
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hx = x1;
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}
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if (deltay < 0)
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{
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ychange = -1;
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deltay = - deltay;
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vy = y2+1;
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//y--;
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}
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else
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{
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ychange = 1;
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vy = y1;
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}
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if (y1 == y2)
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{
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CLIPOBJ_cEnumStart(Clip, FALSE, CT_RECTANGLES, CD_RIGHTDOWN, 0);
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do
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{
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EnumMore = CLIPOBJ_bEnum(Clip, sizeof(RectEnum), (PVOID) &RectEnum);
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for (i = 0; i < RectEnum.c && RectEnum.arcl[i].top <= y1; i++)
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{
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if (y1 < RectEnum.arcl[i].bottom &&
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RectEnum.arcl[i].left <= hx + deltax &&
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hx < RectEnum.arcl[i].right)
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{
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vgaHLine(max(hx, RectEnum.arcl[i].left), y1,
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min(hx + deltax, RectEnum.arcl[i].right)
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-max(hx, RectEnum.arcl[i].left), Pixel);
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}
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}
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} while (EnumMore);
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}
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else if (x1 == x2)
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{
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CLIPOBJ_cEnumStart(Clip, FALSE, CT_RECTANGLES, CD_RIGHTDOWN, 0);
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do
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{
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EnumMore = CLIPOBJ_bEnum(Clip, (ULONG) sizeof(RectEnum), (PVOID) &RectEnum);
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for (i = 0; i < RectEnum.c; i++)
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{
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if (RectEnum.arcl[i].left <= x1 &&
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x1 < RectEnum.arcl[i].right &&
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RectEnum.arcl[i].top <= vy + deltay &&
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vy < RectEnum.arcl[i].bottom)
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{
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vgaVLine(x1,
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max(vy, RectEnum.arcl[i].top),
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min(vy + deltay, RectEnum.arcl[i].bottom)
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- max(vy, RectEnum.arcl[i].top),
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Pixel);
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}
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}
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} while (EnumMore);
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}
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else
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{
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if (0 < xchange)
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{
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if (0 < ychange)
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vgaNWtoSE(Clip, Brush, x, y, deltax, deltay);
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else
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vgaSWtoNE(Clip, Brush, x, y, deltax, deltay);
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}
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else
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{
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if (0 < ychange)
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vgaNEtoSW(Clip, Brush, x, y, deltax, deltay);
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else
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vgaSEtoNW(Clip, Brush, x, y, deltax, deltay);
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}
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}
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return TRUE;
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}
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/* EOF */
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