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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Grayscale framework & demo plugin
*
* Copyright (C) 2004 Jens Arnold
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/* You do not want to touch these if you don't know exactly what you're
* doing. */
#define GRAY_RUNNING 0x0001 /* grayscale overlay is running */
#define GRAY_DEFERRED_UPDATE 0x0002 /* lcd_update() requested */
/* unsigned 16 bit multiplication (a single instruction on the SH) */
#define MULU16(a, b) (((unsigned short) (a)) * ((unsigned short) (b)))
typedef struct
{
int x;
int by; /* 8-pixel units */
int width;
int height;
int bheight; /* 8-pixel units */
int plane_size;
int depth; /* number_of_bitplanes = (number_of_grayscales - 1) */
int cur_plane; /* for the timer isr */
unsigned long randmask; /* mask for random value in graypixel() */
unsigned long flags; /* various flags, see #defines */
unsigned char *data; /* pointer to start of bitplane data */
unsigned long *bitpattern; /* pointer to start of pattern table */
} tGraybuf;
static tGraybuf *graybuf = NULL;
static short gray_random_buffer;
/** prototypes **/
void gray_timer_isr(void);
void graypixel(int x, int y, unsigned long pattern);
void grayblock(int x, int by, unsigned char* src, int stride);
void grayinvertmasked(int x, int by, unsigned char mask);
int gray_init_buffer(unsigned char *gbuf, int gbuf_size, int width,
int bheight, int depth);
void gray_release_buffer(void);
void gray_position_display(int x, int by);
void gray_show_display(bool enable);
/* functions affecting the whole display */
void gray_clear_display(void);
void gray_black_display(void);
void gray_deferred_update(void);
/* scrolling functions */
void gray_scroll_left(int count, bool black_border);
void gray_scroll_right(int count, bool black_border);
void gray_scroll_up8(bool black_border);
void gray_scroll_down8(bool black_border);
void gray_scroll_up(int count, bool black_border);
void gray_scroll_down(int count, bool black_border);
/* pixel functions */
void gray_drawpixel(int x, int y, int brightness);
void gray_invertpixel(int x, int y);
/* line functions */
void gray_drawline(int x1, int y1, int x2, int y2, int brightness);
void gray_invertline(int x1, int y1, int x2, int y2);
/* rectangle functions */
void gray_drawrect(int x1, int y1, int x2, int y2, int brightness);
void gray_fillrect(int x1, int y1, int x2, int y2, int brightness);
void gray_invertrect(int x1, int y1, int x2, int y2);
/* bitmap functions */
void gray_drawgraymap(unsigned char *src, int x, int y, int nx, int ny,
int stride);
void gray_drawbitmap(unsigned char *src, int x, int y, int nx, int ny,
int stride, bool draw_bg, int fg_brightness,
int bg_brightness);
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