diff --git a/include/gint/display-cg.h b/include/gint/display-cg.h
index 6b5fbf2..4130ddb 100644
--- a/include/gint/display-cg.h
+++ b/include/gint/display-cg.h
@@ -46,6 +46,7 @@ enum {
 	C_BLUE  = 0x001f,
 
 	C_NONE = -1,
+   C_INVERT = -2,
 };
 
 /* RGB color maker. Takes three channels of value 0..31 each (the extra bit of
diff --git a/include/gint/display.h b/include/gint/display.h
index 8c224ca..8b21e3e 100644
--- a/include/gint/display.h
+++ b/include/gint/display.h
@@ -89,7 +89,7 @@ void dclear(color_t color);
    @x1 @y1  Top-left rectangle corner (included)
    @x2 @y2  Bottom-right rectangle corner (included)
    @color  fx-9860G: white light* dark* black none invert lighten* darken*
-           fx-CG 50: Any R5G6B5 color or C_NONE
+           fx-CG 50: Any R5G6B5 color, C_NONE or C_INVERT
 
    *: When the gray engine is on, see dgray(). */
 void drect(int x1, int y1, int x2, int y2, int color);
@@ -122,7 +122,7 @@ void drect_border(int x1, int y1, int x2, int y2,
 
    @x @y   Coordinates of the pixel to repaint
    @color  fx-9860G: white light* dark* black none invert lighten* darken*
-           fx-CG 50: Any R5G6B5 color or C_NONE
+           fx-CG 50: Any R5G6B5 color, C_NONE or C_INVERT
 
    *: When the gray engine is on, see dgray(). */
 void dpixel(int x, int y, int color);
diff --git a/src/render-cg/dpixel.c b/src/render-cg/dpixel.c
index 34b40de..ca34af8 100644
--- a/src/render-cg/dpixel.c
+++ b/src/render-cg/dpixel.c
@@ -5,6 +5,8 @@ void dpixel(int x, int y, int color)
 {
 	/* Coordinate checks */
 	if((uint)x >= 396 || (uint)y >= 224 || color == C_NONE) return;
+	int index = 396 * y + x;
 
-	gint_vram[396 * y + x] = color;
+	if(color == C_INVERT) gint_vram[index] ^= 0xffff;
+	else gint_vram[index] = color;
 }
diff --git a/src/render-cg/drect.c b/src/render-cg/drect.c
index 7556082..248fe5c 100644
--- a/src/render-cg/drect.c
+++ b/src/render-cg/drect.c
@@ -31,7 +31,15 @@ void drect(int x1, int y1, int x2, int y2, int color)
 	uint32_t op = (color << 16) | color;
 	int width = (ax2 - ax1) >> 1;
 
-	for(int h = height; h; h--)
+	if(color == C_INVERT) for(int h = height; h; h--)
+	{
+		base[x1] ^= 0xffff;
+		base[x2] ^= 0xffff;
+		for(int w = 0; w < width; w++) v[w] ^= 0xffffffff;
+		v += 198;
+		base += 396;
+	}
+	else for(int h = height; h; h--)
 	{
 		base[x1] = color;
 		base[x2] = color;