From 4b25a22adabbe27cec9b81d0fb812f7ec6371e1a Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Mon, 19 Jul 2021 02:41:43 +0200
Subject: [PATCH] Added the ability to invert LCD colors for the Toshiba T1000
 and T1200, and the Amstrad PPC512/640.

---
 src/machine/m_amstrad.c      | 19 ++++++++++++++++---
 src/machine/m_xt_t1000_vid.c | 28 ++++++++++++++++++++++------
 2 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/src/machine/m_amstrad.c b/src/machine/m_amstrad.c
index c4ace48f0..be44fa734 100644
--- a/src/machine/m_amstrad.c
+++ b/src/machine/m_amstrad.c
@@ -108,7 +108,8 @@ typedef struct {
 		stat;
     uint8_t	plane_write,		/* 1512/200 */
 		plane_read,		/* 1512/200 */
-		border;			/* 1512/200 */
+		border,			/* 1512/200 */
+		invert;			/* 512/640 */
     int		fontbase;		/* 1512/200 */
     int		linepos,
 		displine;
@@ -1695,8 +1696,17 @@ vid_init_200(amstrad_t *ams)
 
     overscan_x = overscan_y = 16;
 
-    green = makecol(0x1C, 0x71, 0x31);
-    blue = makecol(0x0f, 0x21, 0x3f);	
+    if (ams->type == AMS_PC200)
+	vid->invert = 0;
+    else
+	vid->invert = device_get_config_int("invert");
+    if (vid->invert) {
+	blue = makecol(0x1C, 0x71, 0x31);
+	green = makecol(0x0f, 0x21, 0x3f);
+    } else {
+	green = makecol(0x1C, 0x71, 0x31);
+	blue = makecol(0x0f, 0x21, 0x3f);
+    }
     cgapal_rebuild();
     set_lcd_cols(0);
 
@@ -1954,6 +1964,9 @@ device_config_t vid_ppc512_config[] =
 			}
 		}
 	},
+	{
+		"invert", "Invert LCD colors", CONFIG_BINARY, "", 0
+	},
         {
                 "", "", -1
         }
diff --git a/src/machine/m_xt_t1000_vid.c b/src/machine/m_xt_t1000_vid.c
index b0c81eb01..c3930d29e 100644
--- a/src/machine/m_xt_t1000_vid.c
+++ b/src/machine/m_xt_t1000_vid.c
@@ -118,7 +118,8 @@ typedef struct t1000_t
         int vc;
         int dispon;
         int vsynctime;
-	uint8_t video_options, backlight;
+	uint8_t video_options;
+	uint8_t backlight, invert;
 
         uint8_t *vram;
 } t1000_t;
@@ -588,12 +589,22 @@ static void t1000_recalcattrs(t1000_t *t1000)
 	 * 	      are bold */
 
 	/* Set up colours */
-	if (t1000->backlight) {
-		blue = makecol(0x2D, 0x39, 0x5A);
-		grey = makecol(0x85, 0xa0, 0xD6);
+	if (t1000->invert) {
+		if (t1000->backlight) {
+			grey = makecol(0x2D, 0x39, 0x5A);
+			blue = makecol(0x85, 0xa0, 0xD6);
+		} else {
+			grey = makecol(0x0f, 0x21, 0x3f);
+			blue = makecol(0x1C, 0x71, 0x31);
+		}
 	} else {
-		blue = makecol(0x0f, 0x21, 0x3f);
-		grey = makecol(0x1C, 0x71, 0x31);
+		if (t1000->backlight) {
+			blue = makecol(0x2D, 0x39, 0x5A);
+			grey = makecol(0x85, 0xa0, 0xD6);
+		} else {
+			blue = makecol(0x0f, 0x21, 0x3f);
+			grey = makecol(0x1C, 0x71, 0x31);
+		}
 	}
 
 	/* Initialise the attribute mapping. Start by defaulting everything
@@ -686,7 +697,9 @@ static void *t1000_init(const device_t *info)
 	video_inform(VIDEO_FLAG_TYPE_CGA, &timing_t1000);
 
 	t1000->internal = 1;
+
 	t1000->backlight = device_get_config_int("backlight");
+	t1000->invert = device_get_config_int("invert");
 
 	/* 16k video RAM */
         t1000->vram = malloc(0x4000);
@@ -749,6 +762,9 @@ static const device_config_t t1000_config[] =
 	{
 		"backlight", "Enable backlight", CONFIG_BINARY, "", 1
 	},
+	{
+		"invert", "Invert colors", CONFIG_BINARY, "", 0
+	},
 	{
 		.type = -1
 	}