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e200v2/Fuze: Correct and simplify clipping clipping code in lcd_update_rect().

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24197 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2010-01-07 19:35:36 +00:00
parent 2f2213d63e
commit 5fd54dee4f
2 changed files with 39 additions and 39 deletions
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38
firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c
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@ -493,41 +493,41 @@ void lcd_update(void)
void lcd_update_rect(int x, int y, int width, int height)
{
const fb_data *ptr;
int xmax, ymax;
if (!display_on)
return;
xmax = x + width;
if (xmax >= LCD_WIDTH)
xmax = LCD_WIDTH - 1; /* Clip right */
/* nothing to draw? */
if ((width <= 0) || (height <= 0) || (x >= LCD_WIDTH) ||
(y >= LCD_HEIGHT) || (x + width <= 0) || (y + height <= 0))
return;
if (x < 0)
x = 0; /* Clip left */
if (x >= xmax)
return; /* nothing left to do */
width = xmax - x + 1; /* Fix width */
ymax = y + height;
if (ymax >= LCD_HEIGHT)
ymax = LCD_HEIGHT - 1; /* Clip bottom */
{ /* clip left */
width += x;
x = 0;
}
if (y < 0)
y = 0; /* Clip top */
if (y >= ymax)
return; /* nothing left to do */
{ /* clip top */
height += y;
y = 0;
}
if (x + width > LCD_WIDTH)
width = LCD_WIDTH - x; /* clip right */
if (y + height > LCD_HEIGHT)
height = LCD_HEIGHT - y; /* clip bottom */
lcd_write_reg(R_ENTRY_MODE, r_entry_mode);
lcd_window(x, y, xmax, ymax);
lcd_window(x, y, x+width-1, y+height-1);
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
ptr = &lcd_framebuffer[y][x];
height = ymax - y; /* fix height */
do
{
lcd_write_data(ptr, width);
ptr += LCD_WIDTH;
}
while (--height >= 0);
while (--height > 0);
}