7c6bdd6493
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4802 a1c6a512-1295-4272-9138-f99709370657
88 lines
2.6 KiB
C
88 lines
2.6 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_verline() 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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Draw a vertical line from (x, y1) to (x, y2) with the current drawinfo
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----------------------------------------------------------------------------
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See gray_drawpixel() for details
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This one uses the block drawing optimization, so it is rather fast.
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*/
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void gray_verline(int x, int y1, int y2)
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{
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int shift, y, ny;
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unsigned bits, mask_top, mask_bottom;
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unsigned char *dst;
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void (*blockfunc)(unsigned char *address, unsigned mask, unsigned bits);
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if ((unsigned) x >= (unsigned) _graybuf->width
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|| (unsigned) y1 >= (unsigned) _graybuf->height
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|| (unsigned) y2 >= (unsigned) _graybuf->height)
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return;
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if (y1 > y2)
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{
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y = y1;
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y1 = y2;
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y2 = y;
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}
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y = y1;
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ny = y2 - y1 + 1;
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dst = _graybuf->data + x + MULU16(_graybuf->width, y >> 3);
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shift = y & 7;
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ny += shift;
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mask_top = 0xFFu << (y & 7);
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mask_bottom = ~(0xFEu << ((ny - 1) & 7));
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if (ny <= 8)
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mask_bottom &= mask_top;
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blockfunc = _gray_blockfuncs[_graybuf->drawmode];
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bits = (_graybuf->drawmode == GRAY_DRAW_BG) ? 0u : 0xFFu;
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if (ny > 8)
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{
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blockfunc(dst, mask_top, bits);
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dst += _graybuf->width;
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for (y = 8; y < ny - 8; y += 8)
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{
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blockfunc(dst, 0xFFu, bits);
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dst += _graybuf->width;
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}
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}
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blockfunc(dst, mask_bottom, bits);
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}
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#endif // #ifdef HAVE_LCD_BITMAP
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#endif // #ifndef SIMULATOR
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