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ssd1303: make sure sansa clip and whatever others clip updates properly.

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Sometimes I do want to update outside the screen boundaries and it was
messing it up; such things should not cause display problems.

Change-Id: Ic9deec609b19e5a1c603601b20c66599dd44f892
This commit is contained in:
Michael Sevakis 2012-05-19 14:05:11 -04:00
parent 028c5e35ee
commit b1dcd298c7
1 changed files with 12 additions and 6 deletions
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18
firmware/target/arm/as3525/lcd-ssd1303.c
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@ -287,15 +287,21 @@ void lcd_update_rect(int x, int y, int width, int height)
return;
/* The Y coordinates have to work on even 8 pixel rows */
ymax = (y + height-1) >> 3;
y >>= 3;
if(x + width > LCD_WIDTH)
if (x < 0)
height += x, x = 0;
if (x + width > LCD_WIDTH)
width = LCD_WIDTH - x;
if (width <= 0)
return; /* nothing left to do, 0 is harmful to lcd_write_data() */
if(ymax >= LCD_FBHEIGHT)
ymax = LCD_FBHEIGHT-1;
if (y < 0)
height += y, y = 0;
if (y + height > LCD_HEIGHT)
height = LCD_HEIGHT - y;
if (height <= 0)
return; /* nothing left to do */
ymax = (y + height-1) >> 3;
y >>= 3;
/* Copy specified rectange bitmap to hardware */
for (; y <= ymax; y++)