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drivers/lcd_framebuffer.c: If BPP is less then 8, then we need to byte-align the update region.

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This commit is contained in:
Gregory Nutt 2017-11-22 05:35:33 -06:00
parent a645b18860
commit 9a4c3bbe99
1 changed files with 10 additions and 0 deletions
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10
drivers/lcd/lcd_framebuffer.c
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@ -215,6 +215,16 @@ static void lcdfb_update(FAR struct lcdfb_dev_s *priv,
endy = priv->yres-1;
}
/* If the display uses a value of BPP < 8, then we may have to extend the
* rectangle on the left so that it is byte aligned. Works for BPP={1,2,4}
*/
if (pinfo->bpp < 8)
{
unsigned int pixperbyte = 8 / pinfo->bpp;
startx &= ~(pixperbyte - 1);
}
/* Get the starting position in the framebuffer */
run = priv->fbmem + starty * priv->stride;