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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Grayscale framework
* gray_verline() function
*
* This is a generic framework to use grayscale display within Rockbox
* plugins. It obviously does not work for the player.
*
* Copyright (C) 2004 Jens Arnold
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef SIMULATOR /* not for simulator by now */
#include "plugin.h"
#ifdef HAVE_LCD_BITMAP /* and also not for the Player */
#include "gray.h"
/*---------------------------------------------------------------------------
Draw a vertical line from (x, y1) to (x, y2) with the current drawinfo
----------------------------------------------------------------------------
See gray_drawpixel() for details
This one uses the block drawing optimization, so it is rather fast.
*/
void gray_verline(int x, int y1, int y2)
{
int shift, y, ny;
unsigned bits, mask_top, mask_bottom;
unsigned char *dst;
void (*blockfunc)(unsigned char *address, unsigned mask, unsigned bits);
if ((unsigned) x >= (unsigned) _graybuf->width
|| (unsigned) y1 >= (unsigned) _graybuf->height
|| (unsigned) y2 >= (unsigned) _graybuf->height)
return;
if (y1 > y2)
{
y = y1;
y1 = y2;
y2 = y;
}
y = y1;
ny = y2 - y1 + 1;
dst = _graybuf->data + x + MULU16(_graybuf->width, y >> 3);
shift = y & 7;
ny += shift;
mask_top = 0xFFu << (y & 7);
mask_bottom = ~(0xFEu << ((ny - 1) & 7));
if (ny <= 8)
mask_bottom &= mask_top;
blockfunc = _gray_blockfuncs[_graybuf->drawmode];
bits = (_graybuf->drawmode == GRAY_DRAW_BG) ? 0u : 0xFFu;
if (ny > 8)
{
blockfunc(dst, mask_top, bits);
dst += _graybuf->width;
for (y = 8; y < ny - 8; y += 8)
{
blockfunc(dst, 0xFFu, bits);
dst += _graybuf->width;
}
}
blockfunc(dst, mask_bottom, bits);
}
#endif // #ifdef HAVE_LCD_BITMAP
#endif // #ifndef SIMULATOR
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