(svn r10203) -Codechange: more moving things to blitter-layer: DrawLine

6 files changed, 115 insertions, 0 deletions

diff --git a/src/blitter/32bpp_base.cpp b/src/blitter/32bpp_base.cpp
index 6862e2907..adfc0fbef 100644
--- a/src/blitter/32bpp_base.cpp
+++ b/src/blitter/32bpp_base.cpp
@@ -32,6 +32,55 @@ void Blitter_32bppBase::DrawRect(void *video, int width, int height, uint8 color
 	} while (--height);
 }
 
+void Blitter_32bppBase::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_32bppBase::CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch)
 {
 	int direction = (height < 0) ? -1 : 1;
diff --git a/src/blitter/32bpp_base.hpp b/src/blitter/32bpp_base.hpp
index aaa68ef38..df593247c 100644
--- a/src/blitter/32bpp_base.hpp
+++ b/src/blitter/32bpp_base.hpp
@@ -17,6 +17,7 @@ public:
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color);
 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color);
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color);
+	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color);
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch);
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
 	/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height);
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;
diff --git a/src/blitter/8bpp_base.hpp b/src/blitter/8bpp_base.hpp
index 63b28d200..3e93885c7 100644
--- a/src/blitter/8bpp_base.hpp
+++ b/src/blitter/8bpp_base.hpp
@@ -17,6 +17,7 @@ public:
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color);
 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color);
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color);
+	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color);
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch);
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
 	/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height);
diff --git a/src/blitter/base.hpp b/src/blitter/base.hpp
index 79a0895f9..6e59f4e2e 100644
--- a/src/blitter/base.hpp
+++ b/src/blitter/base.hpp
@@ -97,6 +97,19 @@ public:
 	virtual void DrawRect(void *video, int width, int height, uint8 color) = 0;
 
 	/**
+	 * Draw a line with a given color.
+	 * @param video The destination pointer (video-buffer).
+	 * @param x The x coordinate from where the line starts.
+	 * @param y The y coordinate from where the line starts.
+	 * @param x2 The x coordinate to where the line goes.
+	 * @param y2 The y coordinate to where the lines goes.
+	 * @param screen_width The width of the screen you are drawing in (to avoid buffer-overflows).
+	 * @param screen_height The height of the screen you are drawing in (to avoid buffer-overflows).
+	 * @param color A 8bpp mapping color.
+	 */
+	virtual void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color) = 0;
+
+	/**
 	 * Copy from a buffer to the screen.
 	 * @param video The destionation pointer (video-buffer).
 	 * @param src The buffer from which the data will be read.
diff --git a/src/blitter/null.hpp b/src/blitter/null.hpp
index b3bbe2212..61c4f222d 100644
--- a/src/blitter/null.hpp
+++ b/src/blitter/null.hpp
@@ -18,6 +18,7 @@ public:
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color) {};
 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color) {};
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color) {};
+	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color) {};
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch) {};
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) {};
 	/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height) {};