a9244032d2
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4638 a1c6a512-1295-4272-9138-f99709370657
93 lines
3.5 KiB
C
93 lines
3.5 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 & demo plugin
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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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/* You do not want to touch these if you don't know exactly what you're
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* doing. */
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#define GRAY_RUNNING 0x0001 /* grayscale overlay is running */
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#define GRAY_DEFERRED_UPDATE 0x0002 /* lcd_update() requested */
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/* unsigned 16 bit multiplication (a single instruction on the SH) */
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#define MULU16(a, b) (((unsigned short) (a)) * ((unsigned short) (b)))
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typedef struct
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{
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int x;
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int by; /* 8-pixel units */
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int width;
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int height;
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int bheight; /* 8-pixel units */
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int plane_size;
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int depth; /* number_of_bitplanes = (number_of_grayscales - 1) */
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int cur_plane; /* for the timer isr */
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unsigned long randmask; /* mask for random value in graypixel() */
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unsigned long flags; /* various flags, see #defines */
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unsigned char *data; /* pointer to start of bitplane data */
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unsigned long *bitpattern; /* pointer to start of pattern table */
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} tGraybuf;
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static tGraybuf *graybuf = NULL;
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static short gray_random_buffer;
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/** prototypes **/
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void gray_timer_isr(void);
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void graypixel(int x, int y, unsigned long pattern);
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void grayblock(int x, int by, unsigned char* src, int stride);
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void grayinvertmasked(int x, int by, unsigned char mask);
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int gray_init_buffer(unsigned char *gbuf, int gbuf_size, int width,
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int bheight, int depth);
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void gray_release_buffer(void);
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void gray_position_display(int x, int by);
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void gray_show_display(bool enable);
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/* functions affecting the whole display */
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void gray_clear_display(void);
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void gray_black_display(void);
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void gray_deferred_update(void);
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/* scrolling functions */
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void gray_scroll_left(int count, bool black_border);
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void gray_scroll_right(int count, bool black_border);
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void gray_scroll_up8(bool black_border);
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void gray_scroll_down8(bool black_border);
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void gray_scroll_up(int count, bool black_border);
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void gray_scroll_down(int count, bool black_border);
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/* pixel functions */
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void gray_drawpixel(int x, int y, int brightness);
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void gray_invertpixel(int x, int y);
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/* line functions */
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void gray_drawline(int x1, int y1, int x2, int y2, int brightness);
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void gray_invertline(int x1, int y1, int x2, int y2);
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/* rectangle functions */
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void gray_drawrect(int x1, int y1, int x2, int y2, int brightness);
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void gray_fillrect(int x1, int y1, int x2, int y2, int brightness);
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void gray_invertrect(int x1, int y1, int x2, int y2);
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/* bitmap functions */
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void gray_drawgraymap(unsigned char *src, int x, int y, int nx, int ny,
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int stride);
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void gray_drawbitmap(unsigned char *src, int x, int y, int nx, int ny,
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int stride, bool draw_bg, int fg_brightness,
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int bg_brightness);
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