From 09879ea308c600cd5c1a2d69ba70bd4c566710cb Mon Sep 17 00:00:00 2001
From: truelight <truelight@openttd.org>
Date: Mon, 18 Jun 2007 19:38:23 +0000
Subject: (svn r10203) -Codechange: more moving things to blitter-layer:
 DrawLine

---
 src/blitter/8bpp_base.cpp | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

(limited to 'src/blitter/8bpp_base.cpp')

diff --git a/src/blitter/8bpp_base.cpp b/src/blitter/8bpp_base.cpp
index 486d7a190..65de3b195 100644
--- a/src/blitter/8bpp_base.cpp
+++ b/src/blitter/8bpp_base.cpp
@@ -36,6 +36,56 @@ void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 color)
 	} while (--height);
 }
 
+void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color)
+{
+	int dy;
+	int dx;
+	int stepx;
+	int stepy;
+	int frac;
+
+	dy = (y2 - y) * 2;
+	if (dy < 0) {
+		dy = -dy;
+		stepy = -1;
+	} else {
+		stepy = 1;
+	}
+
+	dx = (x2 - x) * 2;
+	if (dx < 0) {
+		dx = -dx;
+		stepx = -1;
+	} else {
+		stepx = 1;
+	}
+
+	this->SetPixel(video, x, y, color);
+	if (dx > dy) {
+		frac = dy - (dx / 2);
+		while (x != x2) {
+			if (frac >= 0) {
+				y += stepy;
+				frac -= dx;
+			}
+			x += stepx;
+			frac += dy;
+			if (x > 0 && y > 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);
+		}
+	} else {
+		frac = dx - (dy / 2);
+		while (y != y2) {
+			if (frac >= 0) {
+				x += stepx;
+				frac -= dy;
+			}
+			y += stepy;
+			frac += dx;
+			if (x > 0 && y > 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);
+		}
+	}
+}
+
 void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch)
 {
 	int direction = (height < 0) ? -1 : 1;
-- 
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