101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Grayscale framework
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* gray_scroll_left() function
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*
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* This is a generic framework to use grayscale display within Rockbox
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* plugins. It obviously does not work for the player.
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*
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* Copyright (C) 2004 Jens Arnold
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef SIMULATOR /* not for simulator by now */
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#include "plugin.h"
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#ifdef HAVE_LCD_BITMAP /* and also not for the Player */
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#include "gray.h"
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/*---------------------------------------------------------------------------
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Scroll the whole grayscale buffer left by <count> pixels
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----------------------------------------------------------------------------
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black_border determines if the pixels scrolled in at the right are black
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or white
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Scrolling left/right by an even pixel count is almost twice as fast as
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scrolling by an odd pixel count.
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*/
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void gray_scroll_left(int count, bool black_border)
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{
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int by, d;
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unsigned filler;
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unsigned char *ptr;
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if ((unsigned) count >= (unsigned) _graybuf->width)
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return;
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filler = black_border ? 0xFF : 0;
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/* Scroll row by row to minimize flicker (byte rows = 8 pixels each) */
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for (by = 0; by < _graybuf->bheight; by++)
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{
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ptr = _graybuf->data + MULU16(_graybuf->width, by);
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for (d = 0; d < _graybuf->depth; d++)
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{
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asm volatile (
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"mov %0,r1 \n" /* check if both source... */
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"or %2,r1 \n" /* ...and offset are even */
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"shlr r1 \n" /* -> lsb = 0 */
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"bf .sl_start2 \n" /* -> copy word-wise */
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"add #-1,%2 \n" /* copy byte-wise */
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".sl_loop1: \n"
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"mov.b @%0+,r1 \n"
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"mov.b r1,@(%2,%0) \n"
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"cmp/hi %0,%1 \n"
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"bt .sl_loop1 \n"
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"bra .sl_end \n"
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"nop \n"
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".sl_start2: \n" /* copy word-wise */
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"add #-2,%2 \n"
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".sl_loop2: \n"
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"mov.w @%0+,r1 \n"
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"mov.w r1,@(%2,%0) \n"
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"cmp/hi %0,%1 \n"
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"bt .sl_loop2 \n"
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".sl_end: \n"
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: /* outputs */
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: /* inputs */
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/* %0 */ "r"(ptr + count),
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/* %1 */ "r"(ptr + _graybuf->width),
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/* %2 */ "z"(-count)
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: /* clobbers */
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"r1"
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);
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_gray_rb->memset(ptr + _graybuf->width - count, filler, count);
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ptr += _graybuf->plane_size;
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}
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}
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}
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#endif // #ifdef HAVE_LCD_BITMAP
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#endif // #ifndef SIMULATOR
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