diff --git a/include/display/common.h b/include/display/common.h
index a1ec4b2..0075e64 100644
--- a/include/display/common.h
+++ b/include/display/common.h
@@ -7,15 +7,15 @@
 
 #include <gint/display.h>
 
-/* dhline() - optimized drawing of a horizontal line
+/* gint_dhline(): Optimized horizontal line
    @x1 @x2 @y  Coordinates of endpoints of line (both included)
    @color      Any color suitable for dline() */
-void dhline(int x1, int x2, int y, color_t color);
+void gint_dhline(int x1, int x2, int y, color_t color);
 
-/* dvline() - optimized drawing of a vertical line
+/* gint_dvline(): Optimized vertical line
    @y1 @y2 @x  Coordinates of endpoints of line (both included)
    @color      Any color suitable for dline() */
-void dvline(int y1, int y2, int x, color_t color);
+void gint_dvline(int y1, int y2, int x, color_t color);
 
 //---
 //	Font rendering (topti)
diff --git a/include/gint/display.h b/include/gint/display.h
index 1ec139c..92dae6e 100644
--- a/include/gint/display.h
+++ b/include/gint/display.h
@@ -95,6 +95,24 @@ void dpixel(int x, int y, color_t color);
                     fxcg50:  Any R5G6B5 color */
 void dline(int x1, int y1, int x2, int y2, color_t color);
 
+/* dhline(): Full-width horizontal line
+   This function draws a horizontal line from the left end of the screen to the
+   right end, much like the Basic command "Horizontal".
+
+   @y      Line number
+   @color  fx9860g: white, black, none, invert
+           fxcg50:  Any R5G6B5 color */
+void dhline(int y, color_t color);
+
+/* dvline(): Full-height vertical line
+   This function draws a vertical line from the top end of the screen to the
+   bottom end, much like the Basic command "Vertical".
+
+   @x      Column number
+   @color  fx9860g: white, black, none, invert
+           fxcg50:  Any R5G6B5 color */
+void dvline(int x, color_t color);
+
 //---
 //	Text rendering (topti)
 //---
diff --git a/include/gint/gray.h b/include/gint/gray.h
index b0325df..5def1a0 100644
--- a/include/gint/gray.h
+++ b/include/gint/gray.h
@@ -130,6 +130,16 @@ void gpixel(int x, int y, color_t color);
    @color           white, light, dark, black, none, invert, lighten, darken */
 void gline(int x1, int y1, int x2, int y2, color_t color);
 
+/* ghline(): Full-width horizontal line
+   @y      Line number
+   @color  white, light, dark, black, none, invert, lighten, darken */
+void ghline(int y, color_t color);
+
+/* gvline(): Full-height vertical line
+   @x      Column number
+   @color  white, light, dark, black, none, invert, lighten, darken */
+void gvline(int x, color_t color);
+
 //---
 //	Text rendering
 //---
diff --git a/src/gray/ghline.c b/src/gray/ghline.c
new file mode 100644
index 0000000..5d6a15c
--- /dev/null
+++ b/src/gray/ghline.c
@@ -0,0 +1,7 @@
+#include <gint/gray.h>
+
+/* ghline(): Full-width horizontal line */
+void ghline(int y, color_t color)
+{
+	gline(0, y, 127, y, color);
+}
diff --git a/src/gray/gvline.c b/src/gray/gvline.c
new file mode 100644
index 0000000..6e298ab
--- /dev/null
+++ b/src/gray/gvline.c
@@ -0,0 +1,7 @@
+#include <gint/gray.h>
+
+/* gvline(): Full-height vertical line */
+void gvline(int x, color_t color)
+{
+	gline(x, 0, x, 63, color);
+}
diff --git a/src/render-cg/dhline.c b/src/render-cg/dhline.c
new file mode 100644
index 0000000..a7a88da
--- /dev/null
+++ b/src/render-cg/dhline.c
@@ -0,0 +1,7 @@
+#include <gint/display.h>
+
+/* dhline(): Full-width horizontal line */
+void dhline(int y, color_t color)
+{
+	dline(0, y, 395, y, color);
+}
diff --git a/src/render-cg/dline.c b/src/render-cg/dline.c
index ec01ba3..fcbf915 100644
--- a/src/render-cg/dline.c
+++ b/src/render-cg/dline.c
@@ -2,8 +2,8 @@
 #include <gint/display.h>
 #include <gint/defs/util.h>
 
-/* dhline() - optimized drawing of a horizontal line */
-void dhline(int x1, int x2, int y, uint16_t color)
+/* gint_dhline(): Optimized horizontal line */
+void gint_dhline(int x1, int x2, int y, uint16_t color)
 {
 	/* Order and bounds */
 	if((uint)y >= 224) return;
@@ -30,8 +30,8 @@ void dhline(int x1, int x2, int y, uint16_t color)
 	while(end > start) *--end = op;
 }
 
-/* dvline() - optimized drawing of a vertical line */
-void dvline(int y1, int y2, int x, uint16_t color)
+/* gint_dvline(): Optimized vertical line */
+void gint_dvline(int y1, int y2, int x, uint16_t color)
 {
 	/* Order and bounds */
 	if((uint)x >= 395) return;
diff --git a/src/render-cg/dvline.c b/src/render-cg/dvline.c
new file mode 100644
index 0000000..2c11797
--- /dev/null
+++ b/src/render-cg/dvline.c
@@ -0,0 +1,7 @@
+#include <gint/display.h>
+
+/* dvline(): Full-height vertical line */
+void dvline(int x, color_t color)
+{
+	dline(x, 0, x, 223, color);
+}
diff --git a/src/render-fx/dhline.c b/src/render-fx/dhline.c
new file mode 100644
index 0000000..5fb6edf
--- /dev/null
+++ b/src/render-fx/dhline.c
@@ -0,0 +1,7 @@
+#include <gint/display.h>
+
+/* dhline(): Full-width horizontal line */
+void dhline(int y, color_t color)
+{
+	dline(0, y, 127, y, color);
+}
diff --git a/src/render-fx/dline.c b/src/render-fx/dline.c
index ebf6d9e..dba5118 100644
--- a/src/render-fx/dline.c
+++ b/src/render-fx/dline.c
@@ -3,8 +3,8 @@
 #include <gint/defs/util.h>
 #include <display/fx.h>
 
-/* dhline() - optimized drawing of a horizontal line using a rectangle mask */
-void dhline(int x1, int x2, int y, color_t color)
+/* gint_dhline(): Optimized horizontal line using a rectangle mask */
+void gint_dhline(int x1, int x2, int y, color_t color)
 {
 	if((uint)y >= 64) return;
 	if(x1 > x2) swap(x1, x2);
@@ -38,8 +38,8 @@ void dhline(int x1, int x2, int y, color_t color)
 	}
 }
 
-/* dvline() - optimized drawing of a vertical line */
-void dvline(int y1, int y2, int x, color_t color)
+/* gint_dvline(): Optimized vertical line */
+void gint_dvline(int y1, int y2, int x, color_t color)
 {
 	if((uint)x >= 128) return;
 	if(y1 > y2) swap(y1, y2);
diff --git a/src/render-fx/dvline.c b/src/render-fx/dvline.c
new file mode 100644
index 0000000..b31dd0d
--- /dev/null
+++ b/src/render-fx/dvline.c
@@ -0,0 +1,7 @@
+#include <gint/display.h>
+
+/* dvline(): Full-height vertical line */
+void dvline(int x, color_t color)
+{
+	dline(x, 0, x, 63, color);
+}
diff --git a/src/render/dline.c b/src/render/dline.c
index c9f9134..0328783 100644
--- a/src/render/dline.c
+++ b/src/render/dline.c
@@ -2,7 +2,7 @@
 #include <gint/defs/util.h>
 #include <display/common.h>
 
-/* dline() - Bresenham line drawing algorithm
+/* dline(): Bresenham line drawing algorithm
    Remotely adapted from MonochromeLib code by Pierre "PerriotLL" Le Gall.
    Relies on platform-dependent dhline() and dvline() for optimized situations.
    @x1 @y1 @x2 @y2  Coordinates of endpoints of line (included)
@@ -12,12 +12,12 @@ void dline(int x1, int y1, int x2, int y2, color_t color)
 	/* Possible optimizations */
 	if(y1 == y2)
 	{
-		dhline(x1, x2, y1, color);
+		gint_dhline(x1, x2, y1, color);
 		return;
 	}
 	if(x1 == x2)
 	{
-		dvline(y1, y2, x1, color);
+		gint_dvline(y1, y2, x1, color);
 		return;
 	}