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