85890b88df
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4985 a1c6a512-1295-4272-9138-f99709370657
116 lines
3.8 KiB
C
116 lines
3.8 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_drawbitmap() 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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Display a bitmap with the current drawinfo
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----------------------------------------------------------------------------
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The drawmode is used as described for gray_set_drawmode()
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This (now) uses the same bitmap format as the core b&w graphics routines,
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so you can use bmp2rb to generate bitmaps for use with this function as
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well.
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A bitmap contains one bit for every pixel that defines if that pixel is
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foreground (1) or background (0). Bits within a byte are arranged
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vertically, LSB at top.
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The bytes are stored in row-major order, with byte 0 being top left,
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byte 1 2nd from left etc. The first row of bytes defines pixel rows
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0..7, the second row defines pixel row 8..15 etc.
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The <stride> parameter is useful if you want to show only a part of a
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bitmap. It should always be set to the "row length" of the bitmap.
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*/
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void gray_drawbitmap(const unsigned char *src, int x, int y, int nx, int ny,
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int stride)
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{
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int shift;
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unsigned bits, mask_top, mask_bottom;
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const unsigned char *src_col;
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unsigned char *dst, *dst_col;
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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) y >= (unsigned) _graybuf->height)
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return;
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if ((unsigned) (y + ny) >= (unsigned) _graybuf->height) /* clip bottom */
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ny = _graybuf->height - y;
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if ((unsigned) (x + nx) >= (unsigned) _graybuf->width) /* clip right */
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nx = _graybuf->width - x;
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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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for(x = 0; x < nx; x++)
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{
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src_col = src++;
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dst_col = dst++;
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bits = 0;
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y = 0;
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if (ny > 8)
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{
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bits = *src_col << shift;
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src_col += stride;
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blockfunc(dst_col, mask_top, bits);
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dst_col += _graybuf->width;
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bits >>= 8;
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for (y = 8; y < ny - 8; y += 8)
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{
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bits |= *src_col << shift;
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src_col += stride;
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blockfunc(dst_col, 0xFFu, bits);
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dst_col += _graybuf->width;
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bits >>= 8;
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}
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}
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if (y + shift < ny)
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bits |= *src_col << shift;
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blockfunc(dst_col, mask_bottom, bits);
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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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