From b726d0d7bdb33cc949accb4c89047603cf39d774 Mon Sep 17 00:00:00 2001
From: Stefan `Sec` Zehl <sec@42.org>
Date: Sat, 9 Jul 2011 23:23:33 +0200
Subject: [PATCH] Support for x-inverted display

---
 firmware/lcd/display.c | 24 ++++++++++++++++--------
 firmware/lcd/display.h |  4 ++++
 firmware/lcd/lcd.h     |  5 +++++
 3 files changed, 25 insertions(+), 8 deletions(-)
 create mode 100644 firmware/lcd/lcd.h

diff --git a/firmware/lcd/display.c b/firmware/lcd/display.c
index 7ae20c2..ad5f798 100644
--- a/firmware/lcd/display.c
+++ b/firmware/lcd/display.c
@@ -11,7 +11,7 @@
 /**************************************************************************/
 
 uint8_t lcdBuffer[RESX*RESY_B];
-int inverted = 0;
+int lcd_layout = 0;
 uint32_t intstatus;
 
 #define TYPE_CMD    0
@@ -115,6 +115,7 @@ bool lcdGetPixel(char x, char y){
 }
 
 void lcdDisplay(uint32_t shift) {
+    char byte;
     select();
 
     lcdWrite(TYPE_CMD,0xB0);
@@ -123,18 +124,25 @@ void lcdDisplay(uint32_t shift) {
     uint16_t i,page;
     for(page=0; page<RESY_B;page++) {
         for(i=0; i<RESX; i++) {
-            if (inverted) {
-                lcdWrite(TYPE_DATA,~lcdBuffer[page*RESX+((i+shift)%RESX)]);
-            } else {
-                lcdWrite(TYPE_DATA,lcdBuffer[page*RESX+((i+shift)%RESX)]);
-            }
+            if (lcd_layout & LCD_MIRRORX)
+                byte=lcdBuffer[page*RESX+RESX-((i+shift)%RESX)];
+            else
+                byte=lcdBuffer[page*RESX+((i+shift)%RESX)];
+
+            if (lcd_layout & LCD_INVERTED)
+                byte=~byte;
+
+            lcdWrite(TYPE_DATA,byte);
         }
     }
 
     deselect();
 }
 
-void lcdInvert(void) {
-    inverted = ~inverted;
+inline void lcdInvert(void) {
+    lcdToggleFlag(LCD_INVERTED);
 }
 
+void lcdToggleFlag(int flag) {
+    lcd_layout=lcd_layout ^ flag;
+}
diff --git a/firmware/lcd/display.h b/firmware/lcd/display.h
index d64b7e4..0690621 100644
--- a/firmware/lcd/display.h
+++ b/firmware/lcd/display.h
@@ -13,6 +13,9 @@
 #define RESY 68
 #define RESY_B 9
 
+#define LCD_INVERTED (1<<0)
+#define LCD_MIRRORX  (1<<1)
+#define LCD_MIRRORY  (1<<2)
 
 /* Display buffer */
 extern uint8_t lcdBuffer[RESX*RESY_B];
@@ -21,6 +24,7 @@ void lcdInit(void);
 void lcdFill(char f);
 void lcdDisplay(uint32_t shift);
 void lcdInvert(void);
+void lcdToggleFlag(int flag);
 void lcdSetPixel(char x, char y, bool f);
 bool lcdGetPixel(char x, char y);
 
diff --git a/firmware/lcd/lcd.h b/firmware/lcd/lcd.h
new file mode 100644
index 0000000..03c1b6e
--- /dev/null
+++ b/firmware/lcd/lcd.h
@@ -0,0 +1,5 @@
+#include "lcd/allfonts.h"
+#include "lcd/backlight.h"
+#include "lcd/decoder.h"
+#include "lcd/display.h"
+#include "lcd/render.h"