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Added lcd_clearline() - the opposite of drawline. We need this to make funny

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graphical stuff.
lcd_bitmap() with the last argument set to 'false' now only OR the bitmap to
the background instead of using XOR as it did previously. I really can't see
the point in XORing...


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1011 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Daniel Stenberg 2002-06-15 13:26:57 +00:00
parent fc9aff3746
commit 3d1c27f4d1
1 changed files with 73 additions and 3 deletions
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76
firmware/drivers/lcd.c
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@ -594,7 +594,7 @@ void lcd_bitmap (unsigned char *src, int x, int y, int nx, int ny,
{
/* First partial row */
data = *src++ << shift;
*dst = (*dst & mask) ^ data;
*dst = (*dst & mask) | data;
data >>= 8;
dst++;
@ -602,7 +602,7 @@ void lcd_bitmap (unsigned char *src, int x, int y, int nx, int ny,
for (y = 8; y < ny-8; y += 8)
{
data |= *src++ << shift;
*dst = (*dst & mask2) ^ data;
*dst = (*dst & mask2) | data;
data >>= 8;
dst++;
}
@ -611,7 +611,7 @@ void lcd_bitmap (unsigned char *src, int x, int y, int nx, int ny,
/* Last partial row */
if (y + shift < ny)
data |= *src++ << shift;
*dst = (*dst & mask3) ^ (data & mask4);
*dst = (*dst & mask3) | (data & mask4);
}
}
@ -729,6 +729,76 @@ void lcd_drawline( int x1, int y1, int x2, int y2 )
}
}
void lcd_clearline( int x1, int y1, int x2, int y2 )
{
int numpixels;
int i;
int deltax, deltay;
int d, dinc1, dinc2;
int x, xinc1, xinc2;
int y, yinc1, yinc2;
deltax = abs(x2 - x1);
deltay = abs(y2 - y1);
if(deltax >= deltay)
{
numpixels = deltax;
d = 2 * deltay - deltax;
dinc1 = deltay * 2;
dinc2 = (deltay - deltax) * 2;
xinc1 = 1;
xinc2 = 1;
yinc1 = 0;
yinc2 = 1;
}
else
{
numpixels = deltay;
d = 2 * deltax - deltay;
dinc1 = deltax * 2;
dinc2 = (deltax - deltay) * 2;
xinc1 = 0;
xinc2 = 1;
yinc1 = 1;
yinc2 = 1;
}
numpixels++; /* include endpoints */
if(x1 > x2)
{
xinc1 = -xinc1;
xinc2 = -xinc2;
}
if(y1 > y2)
{
yinc1 = -yinc1;
yinc2 = -yinc2;
}
x = x1;
y = y1;
for(i=0; i<numpixels; i++)
{
CLEAR_PIXEL(x,y);
if(d < 0)
{
d += dinc1;
x += xinc1;
y += yinc1;
}
else
{
d += dinc2;
x += xinc2;
y += yinc2;
}
}
}
/*
* Set a single pixel
*/