7c6bdd6493
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4802 a1c6a512-1295-4272-9138-f99709370657
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/***************************************************************************
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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_down8() 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 down by 8 pixels
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----------------------------------------------------------------------------
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black_border determines if the pixels scrolled in at the top are black
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or white
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Scrolling up/down by 8 pixels is very fast.
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*/
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void gray_scroll_down8(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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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 = _graybuf->bheight - 1; by > 0; 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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_gray_rb->memcpy(ptr, ptr - _graybuf->width, _graybuf->width);
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ptr += _graybuf->plane_size;
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}
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}
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/* fill first row */
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ptr = _graybuf->data;
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for (d = 0; d < _graybuf->depth; d++)
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{
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_gray_rb->memset(ptr, filler, _graybuf->width);
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ptr += _graybuf->plane_size;
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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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