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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Grayscale framework
* gray_drawbitmap() 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"
/*---------------------------------------------------------------------------
Display a bitmap with the current drawinfo
----------------------------------------------------------------------------
The drawmode is used as described for gray_set_drawmode()
This (now) uses the same bitmap format as the core b&w graphics routines,
so you can use bmp2rb to generate bitmaps for use with this function as
well.
A bitmap contains one bit for every pixel that defines if that pixel is
foreground (1) or background (0). Bits within a byte are arranged
vertically, LSB at top.
The bytes are stored in row-major order, with byte 0 being top left,
byte 1 2nd from left etc. The first row of bytes defines pixel rows
0..7, the second row defines pixel row 8..15 etc.
The <stride> parameter is useful if you want to show only a part of a
bitmap. It should always be set to the "row length" of the bitmap.
*/
void gray_drawbitmap(const unsigned char *src, int x, int y, int nx, int ny,
int stride)
{
int shift;
unsigned bits, mask_top, mask_bottom;
const unsigned char *src_col;
unsigned char *dst, *dst_col;
void (*blockfunc)(unsigned char *address, unsigned mask, unsigned bits);
if ((unsigned) x >= (unsigned) _graybuf->width
|| (unsigned) y >= (unsigned) _graybuf->height)
return;
if ((unsigned) (y + ny) >= (unsigned) _graybuf->height) /* clip bottom */
ny = _graybuf->height - y;
if ((unsigned) (x + nx) >= (unsigned) _graybuf->width) /* clip right */
nx = _graybuf->width - x;
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];
for(x = 0; x < nx; x++)
{
src_col = src++;
dst_col = dst++;
bits = 0;
y = 0;
if (ny > 8)
{
bits = *src_col << shift;
src_col += stride;
blockfunc(dst_col, mask_top, bits);
dst_col += _graybuf->width;
bits >>= 8;
for (y = 8; y < ny - 8; y += 8)
{
bits |= *src_col << shift;
src_col += stride;
blockfunc(dst_col, 0xFFu, bits);
dst_col += _graybuf->width;
bits >>= 8;
}
}
if (y + shift < ny)
bits |= *src_col << shift;
blockfunc(dst_col, mask_bottom, bits);
}
}
#endif // #ifdef HAVE_LCD_BITMAP
#endif // #ifndef SIMULATOR
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