Greyscale library: * Defer application of lcd linearisation + gamma in buffered mode to the actual update. This simplifies the update function (grey_update() and grey_update_rect() now are just calls to grey_ub_gray_bitmap_part()), and makes DRMODE_COMPLEMENT work properly. * Make the simulator version work and behave more similar to the target version.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16080 a1c6a512-1295-4272-9138-f99709370657

5 files changed, 95 insertions, 206 deletions

diff --git a/apps/plugins/lib/grey.h b/apps/plugins/lib/grey.h
index 84b6687..4fc47e1 100644
--- a/apps/plugins/lib/grey.h
+++ b/apps/plugins/lib/grey.h
@@ -155,14 +155,10 @@ struct _grey_info
 #endif
     unsigned long flags;       /* various flags, see #defines */
     struct plugin_api *rb;     /* plugin API pointer */
-#ifndef SIMULATOR
     unsigned char *values;     /* start of greyscale pixel values */
     unsigned char *phases;     /* start of greyscale pixel phases */
-#endif
     unsigned char *buffer;     /* start of chunky pixel buffer (for buffered mode) */
     unsigned char gvalue[256]; /* calculated brightness -> greyvalue table */
-    int fg_val;                /* current foreground value */
-    int bg_val;                /* current background value */
     int fg_brightness;         /* current foreground brightness */
     int bg_brightness;         /* current background brightness */
     int drawmode;              /* current draw mode */
diff --git a/apps/plugins/lib/grey_core.c b/apps/plugins/lib/grey_core.c
index 395a113..0e2408b 100644
--- a/apps/plugins/lib/grey_core.c
+++ b/apps/plugins/lib/grey_core.c
@@ -214,7 +214,27 @@ static inline void _deferred_update(void)
         _grey_info.rb->lcd_update_rect(x2, y1, LCD_WIDTH - x2, y2 - y1);
 }
 
-#ifndef SIMULATOR
+#ifdef SIMULATOR
+
+/* Callback function for grey_ub_gray_bitmap_part() to read a pixel from the
+ * greybuffer. Note that x and y are in LCD coordinates, not greybuffer
+ * coordinates! */
+static unsigned long _grey_get_pixel(int x, int y)
+{
+    int xg = x - _grey_info.x;
+    int yg = y - _grey_info.y;
+#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
+    int idx = _grey_info.width * yg + xg;
+#else
+    int idx = _grey_info.width * (yg & ~_GREY_BMASK) 
+            + (xg << _GREY_BSHIFT) + (~yg & _GREY_BMASK);
+#endif
+
+    return _grey_info.values[idx] + (1 << LCD_DEPTH);
+}
+
+#else /* !SIMULATOR */
+
 /* Timer interrupt handler: display next frame */
 static void _timer_isr(void)
 {
@@ -236,6 +256,7 @@ static void _timer_isr(void)
         _grey_info.flags &= ~_GREY_DEFERRED_UPDATE; /* clear request */
     }
 }
+
 #endif /* !SIMULATOR */
 
 /* fixed point exp() */
@@ -357,22 +378,18 @@ bool grey_init(struct plugin_api* newrb, unsigned char *gbuf, long gbuf_size,
         gbuf     += plane_size;
         buftaken += plane_size;
     }
-#ifdef SIMULATOR
-    _grey_info.buffer = gbuf;
-#else
     _grey_info.values = gbuf;
     gbuf += plane_size;
     _grey_info.phases = gbuf;
-#endif
     buftaken += 2 * plane_size;
 
     if (buftaken > gbuf_size)
         return false;
 
-#ifndef SIMULATOR
     /* Init to white */
     _grey_info.rb->memset(_grey_info.values, 0x80, plane_size);
 
+#ifndef SIMULATOR
     /* Init phases with random bits */
     dst = (unsigned*)(_grey_info.phases);
     end = (unsigned*)(_grey_info.phases + plane_size);
@@ -394,8 +411,6 @@ bool grey_init(struct plugin_api* newrb, unsigned char *gbuf, long gbuf_size,
     _grey_info.bheight = bdim;
 #endif
     _grey_info.flags = 0;
-    _grey_info.fg_val = 0;
-    _grey_info.bg_val = 128;
     _grey_info.fg_brightness = 0;
     _grey_info.bg_brightness = 255;
     _grey_info.drawmode = DRMODE_SOLID;
@@ -442,7 +457,8 @@ void grey_show(bool enable)
         _grey_info.flags |= _GREY_RUNNING;
 #ifdef SIMULATOR
         _grey_info.rb->sim_lcd_ex_init(129, _grey_get_pixel);
-        grey_update();
+        _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x, _grey_info.y,
+                                              _grey_info.width, _grey_info.height);
 #else /* !SIMULATOR */
 #ifdef NEED_BOOST
         _grey_info.rb->cpu_boost(true);
@@ -484,91 +500,17 @@ void grey_show(bool enable)
     }
 }
 
-#ifdef SIMULATOR
-/* Callback function for grey_update_rect() to read a pixel from the greybuffer.
-   Note that x and y are in LCD coordinates, not greybuffer coordinates! */
-static unsigned long _grey_get_pixel(int x, int y)
-{
-    return _grey_info.buffer[(y - _grey_info.y) * _grey_info.width
-                                + x - _grey_info.x] + (1 << LCD_DEPTH);
-}
-
-/* Update a rectangular area of the greyscale overlay */
-void grey_update_rect(int x, int y, int width, int height)
-{
-    if (x + width > _grey_info.width)
-        width = _grey_info.width - x;
-    if (y + height > _grey_info.height)
-        height = _grey_info.height - y;
-
-    x += _grey_info.x;
-    y += _grey_info.y;
-
-    if (x + width > LCD_WIDTH)
-        width = LCD_WIDTH - x;
-    if (y + height > LCD_HEIGHT)
-        height = LCD_HEIGHT - y;
-
-    _grey_info.rb->sim_lcd_ex_update_rect(x, y, width, height);
-}
-
-#else /* !SIMULATOR */
-
 void grey_update_rect(int x, int y, int width, int height)
 {
-    unsigned char *src, *dst;
-
-    if ((width <= 0) || (height <= 0))
-        return; /* nothing to do */
-
-    if (y + height > _grey_info.height)
-        height = _grey_info.height - y;
-    if (x + width > _grey_info.width)
-        width = _grey_info.width - x;
-
-    src = _grey_info.buffer + _GREY_MULUQ(_grey_info.width, y) + x;
-
-#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
-    dst = _grey_info.values + _GREY_MULUQ(_grey_info.width, y) + x;
-
-    do
-    {
-        _grey_info.rb->memcpy(dst, src, width);
-        dst += _grey_info.width;
-        src += _grey_info.width;
-    }
-    while (--height > 0);
-
-#else /* LCD_PIXELFORMAT == VRTICAL_PACKING */
-    do
-    {
-        unsigned char *src_row = src;
-        unsigned char *src_end = src + width;
-
-        dst = _grey_info.values
-            + _GREY_MULUQ(_grey_info.width, y & ~_GREY_BMASK)
-            + (x << _GREY_BSHIFT) + (~y & _GREY_BMASK);
-        do
-        {
-            *dst = *src_row++;
-            dst += _GREY_BSIZE;
-        }
-        while (src_row < src_end);
-
-        y++;
-        src += _grey_info.width;
-    }
-    while (--height > 0);
-
-#endif /* LCD_PIXELFORMAT */
+    grey_ub_gray_bitmap_part(_grey_info.buffer, x, y, _grey_info.width,
+                             x, y, width, height);
 }
 
-#endif /* !SIMULATOR */
-
 /* Update the whole greyscale overlay */
 void grey_update(void)
 {
-    grey_update_rect(0, 0, _grey_info.width, _grey_info.height);
+    grey_ub_gray_bitmap_part(_grey_info.buffer, 0, 0, _grey_info.width,
+                             0, 0, _grey_info.width, _grey_info.height);
 }
 
 /* Do an lcd_update() to show changes done by rb->lcd_xxx() functions
@@ -691,13 +633,8 @@ static void grey_screendump_hook(int fd)
             if (((unsigned)gy < (unsigned)_grey_info.height)
                 && ((unsigned)gx < (unsigned)_grey_info.width))
             {
-#ifdef SIMULATOR
-                unsigned char *src = _grey_info.buffer
-                                   + _GREY_MULUQ(_grey_info.width, gy) + gx;
-#else
                 unsigned char *src = _grey_info.values
                                    + _GREY_MULUQ(_grey_info.width, gy) + gx;
-#endif
                 for (i = 0; i < 4; i++)
                     linebuf[x + i] = BMP_FIXEDCOLORS + *src++;
             }
@@ -724,17 +661,11 @@ static void grey_screendump_hook(int fd)
             if (((unsigned)gy < (unsigned)_grey_info.height)
                 && ((unsigned)gx < (unsigned)_grey_info.width))
             {
-#ifdef SIMULATOR
-                linebuf[x] = BMP_FIXEDCOLORS
-                           + _grey_info.buffer[_GREY_MULUQ(_grey_info.width,
-                                                                     gy) + gx];
-#else
                 linebuf[x] = BMP_FIXEDCOLORS
                            + _grey_info.values[_GREY_MULUQ(_grey_info.width,
                                                            gy & ~_GREY_BMASK)
                                                + (gx << _GREY_BSHIFT)
                                                + (~gy & _GREY_BMASK)];
-#endif
             }
             else
             {
@@ -753,17 +684,11 @@ static void grey_screendump_hook(int fd)
             if (((unsigned)gy < (unsigned)_grey_info.height)
                 && ((unsigned)gx < (unsigned)_grey_info.width))
             {
-#ifdef SIMULATOR
-                linebuf[x] = BMP_FIXEDCOLORS
-                           + _grey_info.buffer[_GREY_MULUQ(_grey_info.width,
-                                                                     gy) + gx];
-#else
                 linebuf[x] = BMP_FIXEDCOLORS
                            + _grey_info.values[_GREY_MULUQ(_grey_info.width,
                                                            gy & ~_GREY_BMASK)
                                                + (gx << _GREY_BSHIFT)
                                                + (~gy & _GREY_BMASK)];
-#endif
             }
             else
             {
diff --git a/apps/plugins/lib/grey_draw.c b/apps/plugins/lib/grey_draw.c
index 9b8acd4..335d6d1 100644
--- a/apps/plugins/lib/grey_draw.c
+++ b/apps/plugins/lib/grey_draw.c
@@ -30,17 +30,17 @@
 
 static void setpixel(unsigned char *address)
 {
-    *address = _grey_info.fg_val;
+    *address = _grey_info.fg_brightness;
 }
 
 static void clearpixel(unsigned char *address)
 {
-    *address = _grey_info.bg_val;
+    *address = _grey_info.bg_brightness;
 }
 
 static void flippixel(unsigned char *address)
 {
-    *address = 128 - *address;
+    *address = ~(*address);
 }
 
 static void nopixel(unsigned char *address)
@@ -59,7 +59,7 @@ void (* const _grey_pixelfuncs[8])(unsigned char *address) = {
 void grey_clear_display(void)
 {
     int value = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-                 _grey_info.fg_val : _grey_info.bg_val;
+                 _grey_info.fg_brightness : _grey_info.bg_brightness;
 
     _grey_info.rb->memset(_grey_info.buffer, value,
                           _GREY_MULUQ(_grey_info.width, _grey_info.height));
@@ -179,7 +179,7 @@ void grey_hline(int x1, int x2, int y)
         if (_grey_info.drawmode & DRMODE_BG)
         {
             fillopt = true;
-            value = _grey_info.bg_val;
+            value = _grey_info.bg_brightness;
         }
     }
     else
@@ -187,7 +187,7 @@ void grey_hline(int x1, int x2, int y)
         if (_grey_info.drawmode & DRMODE_FG)
         {
             fillopt = true;
-            value = _grey_info.fg_val;
+            value = _grey_info.fg_brightness;
         }
     }
     pfunc = _grey_pixelfuncs[_grey_info.drawmode];
@@ -361,7 +361,7 @@ void grey_fillrect(int x, int y, int width, int height)
         if (_grey_info.drawmode & DRMODE_BG)
         {
             fillopt = true;
-            value = _grey_info.bg_val;
+            value = _grey_info.bg_brightness;
         }
     }
     else
@@ -369,7 +369,7 @@ void grey_fillrect(int x, int y, int width, int height)
         if (_grey_info.drawmode & DRMODE_FG)
         {
             fillopt = true;
-            value = _grey_info.fg_val;
+            value = _grey_info.fg_brightness;
         }
     }
     pfunc = _grey_pixelfuncs[_grey_info.drawmode];
@@ -514,16 +514,9 @@ void grey_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
 
     do
     {
-        const unsigned char *src_row = src;
-        unsigned char *dst_row = dst;
-        unsigned char *row_end = dst_row + width;
-
-        do
-            *dst_row++ = _grey_info.gvalue[*src_row++];
-        while (dst_row < row_end);
-
-        src += stride;
+        _grey_info.rb->memcpy(dst, src, width);
         dst += _grey_info.width;
+        src += stride;
     }
     while (dst < dst_end);
 }
@@ -578,39 +571,27 @@ void grey_putsxy(int x, int y, const unsigned char *str)
 
 /*** Unbuffered drawing functions ***/
 
-#ifdef SIMULATOR
-
-/* Clear the whole display */
-void grey_ub_clear_display(void)
-{
-    grey_clear_display();
-    grey_update();
-}
-
-/* Draw a partial greyscale bitmap, canonical format */
-void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
-                              int stride, int x, int y, int width, int height)
-{
-    grey_gray_bitmap_part(src, src_x, src_y, stride, x, y, width, height);
-    grey_update_rect(x, y, width, height);
-}
-
-#else /* !SIMULATOR */
-
 /* Clear the greyscale display (sets all pixels to white) */
 void grey_ub_clear_display(void)
 {
-    int value = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-                     _grey_info.fg_val : _grey_info.bg_val;
-                     
+    int value = _grey_info.gvalue[(_grey_info.drawmode & DRMODE_INVERSEVID) ?
+                                  _grey_info.fg_brightness :
+                                  _grey_info.bg_brightness];
+
     _grey_info.rb->memset(_grey_info.values, value,
                           _GREY_MULUQ(_grey_info.width, _grey_info.height));
+#ifdef SIMULATOR
+    _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x, _grey_info.y,
+                                          _grey_info.width, _grey_info.height);
+#endif
 }
 
 /* Draw a partial greyscale bitmap, canonical format */
 void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
                               int stride, int x, int y, int width, int height)
 {
+    int yc, ye;
+
     /* nothing to draw? */
     if ((width <= 0) || (height <= 0) || (x >= _grey_info.width)
         || (y >= _grey_info.height) || (x + width <= 0) || (y + height <= 0))
@@ -634,15 +615,17 @@ void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
     if (y + height > _grey_info.height)
         height = _grey_info.height - y;
 
-    src += _GREY_MULUQ(stride, src_y) + src_x; /* move starting point */   
+    src += _GREY_MULUQ(stride, src_y) + src_x; /* move starting point */ 
+    yc = y;
+    ye = y + height;
 
     do
     {
 #if LCD_PIXELFORMAT == HORIZONTAL_PACKING
-        int idx = _GREY_MULUQ(_grey_info.width, y) + x;
+        int idx = _GREY_MULUQ(_grey_info.width, yc) + x;
 #else
-        int idx = _GREY_MULUQ(_grey_info.width, y & ~_GREY_BMASK) 
-                + (x << _GREY_BSHIFT) + (~y & _GREY_BMASK);
+        int idx = _GREY_MULUQ(_grey_info.width, yc & ~_GREY_BMASK)
+                + (x << _GREY_BSHIFT) + (~yc & _GREY_BMASK);
 #endif /* LCD_PIXELFORMAT */
         unsigned char *dst_row = _grey_info.values + idx;
         const unsigned char *src_row = src;
@@ -655,14 +638,15 @@ void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
         }
         while (src_row < src_end);
         
-        y++;
         src += stride;
     }
-    while (--height > 0);
+    while (++yc < ye);
+#ifdef SIMULATOR
+    _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x + x, _grey_info.y + y,
+                                          width, height);
+#endif
 }
 
-#endif /* !SIMULATOR */
-
 /* Draw a full greyscale bitmap, canonical format */
 void grey_ub_gray_bitmap(const unsigned char *src, int x, int y, int width,
                          int height)
diff --git a/apps/plugins/lib/grey_parm.c b/apps/plugins/lib/grey_parm.c
index e2accee..63d09df 100644
--- a/apps/plugins/lib/grey_parm.c
+++ b/apps/plugins/lib/grey_parm.c
@@ -49,8 +49,10 @@ void grey_set_position(int x, int y)
     if (_grey_info.flags & _GREY_RUNNING)
     {
 #ifdef SIMULATOR
+        _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x, _grey_info.y,
+                                              _grey_info.width,
+                                              _grey_info.height);
         grey_deferred_lcd_update();
-        grey_update();
 #else
         _grey_info.flags |= _GREY_DEFERRED_UPDATE;
 #endif
@@ -72,7 +74,6 @@ int  grey_get_drawmode(void)
 /* Set the foreground shade for subsequent drawing operations */
 void grey_set_foreground(unsigned brightness)
 {
-    _grey_info.fg_val = _grey_info.gvalue[brightness];
     _grey_info.fg_brightness = brightness;
 }
 
@@ -85,7 +86,6 @@ unsigned grey_get_foreground(void)
 /* Set the background shade for subsequent drawing operations */
 void grey_set_background(unsigned brightness)
 {
-    _grey_info.bg_val = _grey_info.gvalue[brightness];
     _grey_info.bg_brightness = brightness;
 }
 
diff --git a/apps/plugins/lib/grey_scroll.c b/apps/plugins/lib/grey_scroll.c
index 5040dd4..12a27da 100644
--- a/apps/plugins/lib/grey_scroll.c
+++ b/apps/plugins/lib/grey_scroll.c
@@ -41,7 +41,7 @@ void grey_scroll_left(int count)
     data_end = data + _GREY_MULUQ(_grey_info.width, _grey_info.height);
     length = _grey_info.width - count;
     blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
+             _grey_info.fg_brightness : _grey_info.bg_brightness;
 
     do
     {
@@ -66,7 +66,7 @@ void grey_scroll_right(int count)
     data_end = data + _GREY_MULUQ(_grey_info.width, _grey_info.height);
     length = _grey_info.width - count;
     blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
+             _grey_info.fg_brightness : _grey_info.bg_brightness;
 
     do
     {
@@ -89,7 +89,7 @@ void grey_scroll_up(int count)
     shift = _GREY_MULUQ(_grey_info.width, count);
     length = _GREY_MULUQ(_grey_info.width, _grey_info.height - count);
     blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
+             _grey_info.fg_brightness : _grey_info.bg_brightness;
 
     _grey_info.rb->memmove(_grey_info.buffer, _grey_info.buffer + shift,
                            length);
@@ -108,7 +108,7 @@ void grey_scroll_down(int count)
     shift = _GREY_MULUQ(_grey_info.width, count);
     length = _GREY_MULUQ(_grey_info.width, _grey_info.height - count);
     blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
+             _grey_info.fg_brightness : _grey_info.bg_brightness;
 
     _grey_info.rb->memmove(_grey_info.buffer + shift, _grey_info.buffer,
                            length);
@@ -117,38 +117,6 @@ void grey_scroll_down(int count)
 
 /*** Unbuffered scrolling functions ***/
 
-#ifdef SIMULATOR
-
-/* Scroll left */
-void grey_ub_scroll_left(int count)
-{
-    grey_scroll_left(count);
-    grey_update();
-}
-
-/* Scroll right */
-void grey_ub_scroll_right(int count)
-{
-    grey_scroll_right(count);
-    grey_update();
-}
-
-/* Scroll up */
-void grey_ub_scroll_up(int count)
-{
-    grey_scroll_up(count);
-    grey_update();
-}
-
-/* Scroll down */
-void grey_ub_scroll_down(int count)
-{
-    grey_scroll_down(count);
-    grey_update();
-}
-
-#else /* !SIMULATOR */
-
 /* Scroll left */
 void grey_ub_scroll_left(int count)
 {
@@ -162,9 +130,9 @@ void grey_ub_scroll_left(int count)
     data_end = data + _GREY_MULUQ(_grey_info.width, _grey_info.height);
     length = (_grey_info.width - count) << _GREY_BSHIFT;
     count <<= _GREY_BSHIFT;
-    blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
-
+    blank = _grey_info.gvalue[(_grey_info.drawmode & DRMODE_INVERSEVID) ?
+                              _grey_info.fg_brightness :
+                              _grey_info.bg_brightness];
     do
     {
         _grey_info.rb->memmove(data, data + count, length);
@@ -173,6 +141,10 @@ void grey_ub_scroll_left(int count)
         data += count;
     }
     while (data < data_end);
+#ifdef SIMULATOR
+    _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x, _grey_info.y,
+                                          _grey_info.width, _grey_info.height);
+#endif
 }
 
 /* Scroll right */
@@ -188,9 +160,9 @@ void grey_ub_scroll_right(int count)
     data_end = data + _GREY_MULUQ(_grey_info.width, _grey_info.height);
     length = (_grey_info.width - count) << _GREY_BSHIFT;
     count <<= _GREY_BSHIFT;
-    blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
-
+    blank = _grey_info.gvalue[(_grey_info.drawmode & DRMODE_INVERSEVID) ?
+                              _grey_info.fg_brightness :
+                              _grey_info.bg_brightness];
     do
     {
         _grey_info.rb->memmove(data + count, data, length);
@@ -198,6 +170,10 @@ void grey_ub_scroll_right(int count)
         data += _grey_info.width << _GREY_BSHIFT;
     }
     while (data < data_end);
+#ifdef SIMULATOR
+    _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x, _grey_info.y,
+                                          _grey_info.width, _grey_info.height);
+#endif
 }
 
 /* Scroll up */
@@ -211,8 +187,9 @@ void grey_ub_scroll_up(int count)
 
     dst   = _grey_info.values;
     end   = dst + _GREY_MULUQ(_grey_info.height, _grey_info.width);
-    blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
+    blank = _grey_info.gvalue[(_grey_info.drawmode & DRMODE_INVERSEVID) ?
+                              _grey_info.fg_brightness :
+                              _grey_info.bg_brightness];
 
 #if LCD_PIXELFORMAT == VERTICAL_PACKING
     if (count & _GREY_BMASK)
@@ -264,6 +241,10 @@ void grey_ub_scroll_up(int count)
         dst += blen;
     }
     _grey_info.rb->memset(dst, blank, end - dst); /* Fill remainder at once. */
+#ifdef SIMULATOR
+    _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x, _grey_info.y,
+                                          _grey_info.width, _grey_info.height);
+#endif
 }
 
 /* Scroll down */
@@ -277,8 +258,9 @@ void grey_ub_scroll_down(int count)
 
     start = _grey_info.values;
     dst   = start + _GREY_MULUQ(_grey_info.height, _grey_info.width);
-    blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
-             _grey_info.fg_val : _grey_info.bg_val;
+    blank = _grey_info.gvalue[(_grey_info.drawmode & DRMODE_INVERSEVID) ?
+                              _grey_info.fg_brightness :
+                              _grey_info.bg_brightness];
 
 #if LCD_PIXELFORMAT == VERTICAL_PACKING
     if (count & _GREY_BMASK)
@@ -331,6 +313,8 @@ void grey_ub_scroll_down(int count)
     }
     _grey_info.rb->memset(start, blank, dst - start); 
     /* Fill remainder at once. */
+#ifdef SIMULATOR
+    _grey_info.rb->sim_lcd_ex_update_rect(_grey_info.x, _grey_info.y,
+                                          _grey_info.width, _grey_info.height);
+#endif
 }
-
-#endif /* !SIMULATOR */