From cd864070e466022873305b4fc6c6e9b915ce3b78 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 10 Sep 2002 07:07:44 +0000
Subject: added lcd_update_rect() simulator-style

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2255 a1c6a512-1295-4272-9138-f99709370657
---
 uisimulator/x11/lcd-x11.c | 78 +++++++++++++++++++++++++++++++++++++----------
 1 file changed, 62 insertions(+), 16 deletions(-)

diff --git a/uisimulator/x11/lcd-x11.c b/uisimulator/x11/lcd-x11.c
index e1d1953..7547008 100644
--- a/uisimulator/x11/lcd-x11.c
+++ b/uisimulator/x11/lcd-x11.c
@@ -56,33 +56,75 @@ void lcd_update (void)
     int cp=0;
     XPoint clearpoints[LCD_WIDTH * LCD_HEIGHT];
 
-#if 0
-    screen_resized(LCD_WIDTH, LCD_HEIGHT);
-
     for(y=0; y<LCD_HEIGHT; y+=8) {
         for(x=0; x<LCD_WIDTH; x++) {
-            if(lcd_framebuffer[x][y/8]) {
-                /* one or more bits/pixels are set */
+            if(lcd_framebuffer[x][y/8] || lcd_framebuffer_copy[x][y/8]) {
+                /* one or more bits/pixels are changed */
+                unsigned char diff =
+                  lcd_framebuffer[x][y/8] ^ lcd_framebuffer_copy[x][y/8];
+
                 for(bit=0; bit<8; bit++) {
                     if(lcd_framebuffer[x][y/8]&(1<<bit)) {
+                        /* set a dot */
                         points[p].x = x + MARGIN_X;
                         points[p].y = y+bit + MARGIN_Y;
                         p++; /* increase the point counter */
                     }
+                    else if(diff &(1<<bit)) {
+                        /* clear a dot */
+                        clearpoints[cp].x = x + MARGIN_X;
+                        clearpoints[cp].y = y+bit + MARGIN_Y;
+                        cp++; /* increase the point counter */
+                    }
                 }
             }
         }
     }
-#else
-    for(y=0; y<LCD_HEIGHT; y+=8) {
-        for(x=0; x<LCD_WIDTH; x++) {
-            if(lcd_framebuffer[x][y/8] || lcd_framebuffer_copy[x][y/8]) {
+
+    /* copy a huge block */
+    memcpy(lcd_framebuffer_copy, lcd_framebuffer, sizeof(lcd_framebuffer));
+
+    drawdots(0, &clearpoints[0], cp);
+    drawdots(1, &points[0], p);
+/*    Logf("lcd_update: Draws %d pixels, clears %d pixels", p, cp);*/
+    XSync(dpy,False);
+}
+
+void lcd_update_rect(int x_start, int y_start,
+                     int width, int height)
+{
+    int x;
+    int yline=y_start;
+    int y;
+    int p=0;
+    int bit;
+    int cp=0;
+    int xmax;
+    int ymax;
+    XPoint points[LCD_WIDTH * LCD_HEIGHT];
+    XPoint clearpoints[LCD_WIDTH * LCD_HEIGHT];
+
+    /* The Y coordinates have to work on even 8 pixel rows */
+    ymax = (yline + height)/8;
+    yline /= 8;
+ 
+    xmax = x_start + width;
+
+    if(xmax > LCD_WIDTH)
+        xmax = LCD_WIDTH;
+    if(ymax >= LCD_HEIGHT/8)
+        ymax = LCD_HEIGHT/8-1;
+
+    for(; yline<ymax; yline++) {
+        y = yline * 8;
+        for(x=x_start; x<xmax; x++) {
+            if(lcd_framebuffer[x][yline] || lcd_framebuffer_copy[x][yline]) {
                 /* one or more bits/pixels are changed */
                 unsigned char diff =
-                  lcd_framebuffer[x][y/8] ^ lcd_framebuffer_copy[x][y/8];
+                  lcd_framebuffer[x][yline] ^ lcd_framebuffer_copy[x][yline];
 
                 for(bit=0; bit<8; bit++) {
-                    if(lcd_framebuffer[x][y/8]&(1<<bit)) {
+                    if(lcd_framebuffer[x][yline]&(1<<bit)) {
                         /* set a dot */
                         points[p].x = x + MARGIN_X;
                         points[p].y = y+bit + MARGIN_Y;
@@ -95,17 +137,21 @@ void lcd_update (void)
                         cp++; /* increase the point counter */
                     }
                 }
+
+                /* update the copy */
+                lcd_framebuffer_copy[x][yline] = lcd_framebuffer[x][yline];
             }
         }
     }
 
-    /* copy a huge block */
-    memcpy(lcd_framebuffer_copy, lcd_framebuffer, sizeof(lcd_framebuffer));
-
-#endif
-
     drawdots(0, &clearpoints[0], cp);
     drawdots(1, &points[0], p);
 /*    Logf("lcd_update: Draws %d pixels, clears %d pixels", p, cp);*/
     XSync(dpy,False);
 }
+
+/* -----------------------------------------------------------------
+ * local variables:
+ * eval: (load-file "../../firmware/rockbox-mode.el")
+ * end:
+ */
-- 
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