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rockbox/apps/plugins/lib/gray_core.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Greyscale framework
* Core & miscellaneous functions
*
* This is a generic framework to use grayscale display within Rockbox
* plugins. It obviously does not work for the player.
*
* Copyright (C) 2004-2005 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.
*
****************************************************************************/
#ifndef SIMULATOR /* not for simulator by now */
#include "plugin.h"
#ifdef HAVE_LCD_BITMAP /* and also not for the Player */
#include "gray.h"
/* Global variables */
struct plugin_api *_gray_rb = NULL; /* global api struct pointer */
struct _gray_info _gray_info; /* global info structure */
short _gray_random_buffer; /* buffer for random number generator */
/* Prototypes */
static void _timer_isr(void);
/* Timer interrupt handler: display next bitplane */
static void _timer_isr(void)
{
_gray_rb->lcd_blit(_gray_info.plane_data + MULU16(_gray_info.plane_size,
_gray_info.cur_plane), _gray_info.x, _gray_info.by,
_gray_info.width, _gray_info.bheight, _gray_info.width);
if (++_gray_info.cur_plane >= _gray_info.depth)
_gray_info.cur_plane = 0;
if (_gray_info.flags & _GRAY_DEFERRED_UPDATE) /* lcd_update() requested? */
{
int x1 = MAX(_gray_info.x, 0);
int x2 = MIN(_gray_info.x + _gray_info.width, LCD_WIDTH);
int y1 = MAX(_gray_info.by << _PBLOCK_EXP, 0);
int y2 = MIN((_gray_info.by << _PBLOCK_EXP) + _gray_info.height, LCD_HEIGHT);
if (y1 > 0) /* refresh part above overlay, full width */
_gray_rb->lcd_update_rect(0, 0, LCD_WIDTH, y1);
if (y2 < LCD_HEIGHT) /* refresh part below overlay, full width */
_gray_rb->lcd_update_rect(0, y2, LCD_WIDTH, LCD_HEIGHT - y2);
if (x1 > 0) /* refresh part to the left of overlay */
_gray_rb->lcd_update_rect(0, y1, x1, y2 - y1);
if (x2 < LCD_WIDTH) /* refresh part to the right of overlay */
_gray_rb->lcd_update_rect(x2, y1, LCD_WIDTH - x2, y2 - y1);
_gray_info.flags &= ~_GRAY_DEFERRED_UPDATE; /* clear request */
}
}
/* Initialise the framework and prepare the greyscale display buffer
arguments:
newrb = pointer to plugin api
gbuf = pointer to the memory area to use (e.g. plugin buffer)
gbuf_size = max usable size of the buffer
buffered = use chunky pixel buffering with delta buffer?
This allows to use all drawing functions, but needs more
memory. Unbuffered operation provides only a subset of
drawing functions. (only gray_bitmap drawing and scrolling)
width = width in pixels (1..LCD_WIDTH)
bheight = height in LCD pixel-block units (8 pixels for b&w LCD,
4 pixels for 4-grey LCD) (1..LCD_HEIGHT/block_size)
depth = number of bitplanes to use (1..32 for b&w LCD, 1..16 for
4-grey LCD).
result:
= depth if there was enough memory
< depth if there wasn't enough memory. The number of displayable
shades is smaller than desired, but it still works
= 0 if there wasn't even enough memory for 1 bitplane
You can request any depth in the allowed range, not just powers of 2. The
routine performs "graceful degradation" if the memory is not sufficient for
the desired depth. As long as there is at least enough memory for 1 bitplane,
it creates as many bitplanes as fit into memory, although 1 bitplane won't
deliver an enhancement over the native display.
The number of displayable shades is calculated as follows:
b&w LCD: shades = depth + 1
4-grey LCD: shades = 3 * depth + 1
If you need info about the memory taken by the greyscale buffer, supply a
long* as the last parameter. This long will then contain the number of bytes
used. The total memory needed can be calculated as follows:
total_mem =
shades * sizeof(long) (bitpatterns)
+ (width * bheight) * depth (bitplane data)
+ buffered ? (chunky front- & backbuffer)
(width * bheight * 8(4) * 2) : 0
+ 0..3 (longword alignment) */
int gray_init(struct plugin_api* newrb, unsigned char *gbuf, long gbuf_size,
bool buffered, int width, int bheight, int depth, long *buf_taken)
{
int possible_depth, i, j;
long plane_size, buftaken;
_gray_rb = newrb;
if ((unsigned) width > LCD_WIDTH
|| (unsigned) bheight > (LCD_HEIGHT/_PBLOCK)
|| depth < 1)
return 0;
/* the buffer has to be long aligned */
buftaken = (-(long)gbuf) & 3;
gbuf += buftaken;
/* chunky front- & backbuffer */
if (buffered)
{
plane_size = MULU16(width, bheight << _PBLOCK_EXP);
buftaken += 2 * plane_size;
if (buftaken > gbuf_size)
return 0;
_gray_info.cur_buffer = gbuf;
gbuf += plane_size;
/* set backbuffer to 0xFF to guarantee the initial full update */
_gray_rb->memset(gbuf, 0xFF, plane_size);
_gray_info.back_buffer = gbuf;
gbuf += plane_size;
}
plane_size = MULU16(width, bheight);
possible_depth = (gbuf_size - buftaken - sizeof(long))
/ (plane_size + sizeof(long));
if (possible_depth < 1)
return 0;
depth = MIN(depth, 32);
depth = MIN(depth, possible_depth);
_gray_info.x = 0;
_gray_info.by = 0;
_gray_info.width = width;
_gray_info.height = bheight << _PBLOCK_EXP;
_gray_info.bheight = bheight;
_gray_info.plane_size = plane_size;
_gray_info.depth = depth;
_gray_info.cur_plane = 0;
_gray_info.flags = 0;
_gray_info.plane_data = gbuf;
gbuf += depth * plane_size;
_gray_info.bitpattern = (unsigned long *)gbuf;
buftaken += depth * plane_size + (depth + 1) * sizeof(long);
i = depth - 1;
j = 8;
while (i != 0)
{
i >>= 1;
j--;
}
_gray_info.randmask = 0xFFu >> j;
/* Precalculate the bit patterns for all possible pixel values */
for (i = 0; i <= depth; i++)
{
unsigned long pattern = 0;
int value = 0;
for (j = 0; j < depth; j++)
{
pattern <<= 1;
value += i;
if (value >= depth)
value -= depth; /* "white" bit */
else
pattern |= 1; /* "black" bit */
}
/* now the lower <depth> bits contain the pattern */
_gray_info.bitpattern[i] = pattern;
}
_gray_info.fg_brightness = 0;
_gray_info.bg_brightness = depth;
_gray_info.drawmode = DRMODE_SOLID;
_gray_info.curfont = FONT_SYSFIXED;
if (buf_taken) /* caller requested info about space taken */
*buf_taken = buftaken;
return depth;
}
/* Release the greyscale display buffer and the library
DO CALL either this function or at least gray_show_display(false)
before you exit, otherwise nasty things may happen. */
void gray_release(void)
{
gray_show(false);
}
/* Switch the greyscale overlay on or off
DO NOT call lcd_update() or any other api function that directly accesses
the lcd while the greyscale overlay is running! If you need to do
lcd_update() to update something outside the greyscale overlay area, use
gray_deferred_update() instead.
Other functions to avoid are:
lcd_blit() (obviously), lcd_update_rect(), lcd_set_contrast(),
lcd_set_invert_display(), lcd_set_flip(), lcd_roll() */
void gray_show(bool enable)
{
#if (CONFIG_CPU == SH7034) && (CONFIG_LCD == LCD_SSD1815)
if (enable)
{
_gray_info.flags |= _GRAY_RUNNING;
_gray_rb->timer_register(1, NULL, FREQ / 67, 1, _timer_isr);
}
else
{
_gray_rb->timer_unregister();
_gray_info.flags &= ~_GRAY_RUNNING;
_gray_rb->lcd_update(); /* restore whatever there was before */
}
#elif defined(CPU_COLDFIRE) && (CONFIG_LCD == LCD_S1D15E06)
if (enable && !(_gray_info.flags & _GRAY_RUNNING))
{
_gray_info.flags |= _GRAY_RUNNING;
_gray_rb->cpu_boost(true); /* run at 120 MHz to avoid freq changes */
_gray_rb->timer_register(1, NULL, *_gray_rb->cpu_frequency / 70, 1,
_timer_isr);
}
else if (!enable && (_gray_info.flags & _GRAY_RUNNING))
{
_gray_rb->timer_unregister();
_gray_rb->cpu_boost(false);
_gray_info.flags &= ~_GRAY_RUNNING;
_gray_rb->lcd_update(); /* restore whatever there was before */
}
#endif
}
/* Update a rectangular area of the greyscale overlay */
void gray_update_rect(int x, int y, int width, int height)
{
int ymax;
long srcofs;
unsigned char *dst;
if (width <= 0)
return; /* nothing to do */
/* The Y coordinates have to work on whole pixel block rows */
ymax = (y + height - 1) >> _PBLOCK_EXP;
y >>= _PBLOCK_EXP;
if (x + width > _gray_info.width)
width = _gray_info.width - x;
if (ymax >= _gray_info.bheight)
ymax = _gray_info.bheight - 1;
srcofs = (y << _PBLOCK_EXP) + MULU16(_gray_info.height, x);
dst = _gray_info.plane_data + MULU16(_gray_info.width, y) + x;
/* Copy specified rectange bitmap to hardware */
for (; y <= ymax; y++)
{
long srcofs_row = srcofs;
unsigned char *dst_row = dst;
unsigned char *dst_end = dst_row + width;
do
{
#if (CONFIG_CPU == SH7034) && (LCD_DEPTH == 1)
unsigned long pat_stack[8];
unsigned long *pat_ptr;
unsigned change, ofs;
ofs = srcofs_row;
asm volatile (
"mov.l @(%[ofs],%[cbuf]),r1\n"
"mov.l @(%[ofs],%[bbuf]),r2\n"
"xor r1,r2 \n"
"add #4,%[ofs] \n"
"mov.l @(%[ofs],%[cbuf]),r1\n"
"mov.l @(%[ofs],%[bbuf]),%[chg]\n"
"xor r1,%[chg] \n"
"or r2,%[chg] \n"
: /* outputs */
[ofs] "+z"(ofs),
[chg] "=r"(change)
: /* inputs */
[cbuf]"r"(_gray_info.cur_buffer),
[bbuf]"r"(_gray_info.back_buffer)
: /* clobbers */
"r1", "r2"
);
if (change != 0)
{
unsigned char *cbuf, *bbuf, *addr, *end;
unsigned mask;
pat_ptr = &pat_stack[8];
cbuf = _gray_info.cur_buffer;
bbuf = _gray_info.back_buffer;
/* precalculate the bit patterns with random shifts
* for all 8 pixels and put them on an extra "stack" */
asm volatile (
"add %[ofs],%[cbuf] \n"
"add %[ofs],%[bbuf] \n"
"mov #8,r3 \n" /* loop count in r3: 8 pixels */
".ur_pre_loop: \n"
"mov.b @%[cbuf]+,r0\n" /* read current buffer */
"mov.b @%[bbuf],r1 \n" /* read back buffer */
"mov #0,r2 \n" /* preset for skipped pixel */
"mov.b r0,@%[bbuf] \n" /* update back buffer */
"add #1,%[bbuf] \n"
"cmp/eq r0,r1 \n" /* no change? */
"bt .ur_skip \n" /* -> skip */
"shll2 r0 \n" /* pixel value -> pattern offset */
"mov.l @(r0,%[bpat]),r4\n" /* r4 = bitpattern[byte]; */
"mov #75,r0 \n"
"mulu r0,%[rnd] \n" /* multiply by 75 */
"sts macl,%[rnd] \n"
"add #74,%[rnd] \n" /* add another 74 */
/* Since the lower bits are not very random: */
"swap.b %[rnd],r1 \n" /* get bits 8..15 (need max. 5) */
"and %[rmsk],r1 \n" /* mask out unneeded bits */
"cmp/hs %[dpth],r1 \n" /* random >= depth ? */
"bf .ur_ntrim \n"
"sub %[dpth],r1 \n" /* yes: random -= depth; */
".ur_ntrim: \n"
"mov.l .ashlsi3,r0 \n" /** rotate pattern **/
"jsr @r0 \n" /* r4 -> r0, shift left by r5 */
"mov r1,r5 \n"
"mov %[dpth],r5 \n"
"sub r1,r5 \n" /* r5 = depth - r1 */
"mov.l .lshrsi3,r1 \n"
"jsr @r1 \n" /* r4 -> r0, shift right by r5 */
"mov r0,r2 \n" /* store previous result in r2 */
"or r0,r2 \n" /* rotated_pattern = r2 | r0 */
"clrt \n" /* mask bit = 0 (replace) */
".ur_skip: \n" /* T == 1 if skipped */
"rotcr %[mask] \n" /* get mask bit */
"mov.l r2,@-%[patp]\n" /* push on pattern stack */
"add #-1,r3 \n" /* decrease loop count */
"cmp/pl r3 \n" /* loop count > 0? */
"bt .ur_pre_loop\n" /* yes: loop */
"shlr8 %[mask] \n"
"shlr16 %[mask] \n"
: /* outputs */
[cbuf]"+r"(cbuf),
[bbuf]"+r"(bbuf),
[rnd] "+r"(_gray_random_buffer),
[patp]"+r"(pat_ptr),
[mask]"=&r"(mask)
: /* inputs */
[ofs] "[mask]"(srcofs_row),
[dpth]"r"(_gray_info.depth),
[bpat]"r"(_gray_info.bitpattern),
[rmsk]"r"(_gray_info.randmask)
: /* clobbers */
"r0", "r1", "r2", "r3", "r4", "r5", "macl", "pr"
);
addr = dst_row;
end = addr + MULU16(_gray_info.depth, _gray_info.plane_size);
/* set the bits for all 8 pixels in all bytes according to the
* precalculated patterns on the pattern stack */
asm volatile (
"mov.l @%[patp]+,r1\n" /* pop all 8 patterns */
"mov.l @%[patp]+,r2\n"
"mov.l @%[patp]+,r3\n"
"mov.l @%[patp]+,r6\n"
"mov.l @%[patp]+,r7\n"
"mov.l @%[patp]+,r8\n"
"mov.l @%[patp]+,r9\n"
"mov.l @%[patp]+,r10 \n"
"tst %[mask],%[mask] \n" /* nothing to keep? */
"bt .ur_sloop \n" /* yes: jump to short loop */
".ur_floop: \n" /** full loop (there are bits to keep)**/
"shlr r1 \n" /* rotate lsb of pattern 1 to t bit */
"rotcl r0 \n" /* rotate t bit into r0 */
"shlr r2 \n"
"rotcl r0 \n"
"shlr r3 \n"
"rotcl r0 \n"
"shlr r6 \n"
"rotcl r0 \n"
"shlr r7 \n"
"rotcl r0 \n"
"shlr r8 \n"
"rotcl r0 \n"
"shlr r9 \n"
"rotcl r0 \n"
"shlr r10 \n"
"mov.b @%[addr],%[patp]\n" /* read old value */
"rotcl r0 \n"
"and %[mask],%[patp] \n" /* mask out unneeded bits */
"or %[patp],r0 \n" /* set new bits */
"mov.b r0,@%[addr] \n" /* store value to bitplane */
"add %[psiz],%[addr] \n" /* advance to next bitplane */
"cmp/hi %[addr],%[end] \n" /* last bitplane done? */
"bt .ur_floop \n" /* no: loop */
"bra .ur_end \n"
"nop \n"
".ur_sloop: \n" /** short loop (nothing to keep) **/
"shlr r1 \n" /* rotate lsb of pattern 1 to t bit */
"rotcl r0 \n" /* rotate t bit into r0 */
"shlr r2 \n"
"rotcl r0 \n"
"shlr r3 \n"
"rotcl r0 \n"
"shlr r6 \n"
"rotcl r0 \n"
"shlr r7 \n"
"rotcl r0 \n"
"shlr r8 \n"
"rotcl r0 \n"
"shlr r9 \n"
"rotcl r0 \n"
"shlr r10 \n"
"rotcl r0 \n"
"mov.b r0,@%[addr] \n" /* store byte to bitplane */
"add %[psiz],%[addr] \n" /* advance to next bitplane */
"cmp/hi %[addr],%[end] \n" /* last bitplane done? */
"bt .ur_sloop \n" /* no: loop */
".ur_end: \n"
: /* outputs */
[patp]"+r"(pat_ptr),
[addr]"+r"(addr),
[mask]"+r"(mask)
: /* inputs */
[end] "r"(end),
[psiz]"r"(_gray_info.plane_size)
: /* clobbers */
"r0", "r1", "r2", "r3", "r6", "r7", "r8", "r9", "r10"
);
}
#elif defined(CPU_COLDFIRE) && (LCD_DEPTH == 2)
unsigned long pat_stack[4];
unsigned long *pat_ptr;
unsigned change;
asm volatile (
"move.l (%[ofs]:l:1,%[cbuf]),%[chg] \n"
"sub.l (%[ofs]:l:1,%[bbuf]),%[chg] \n"
: /* outputs */
[chg] "=&d"(change)
: /* inputs */
[cbuf]"a"(_gray_info.cur_buffer),
[bbuf]"a"(_gray_info.back_buffer),
[ofs] "d"(srcofs_row)
);
if (change != 0)
{
unsigned char *cbuf, *bbuf, *addr, *end;
unsigned mask;
pat_ptr = &pat_stack[4];
cbuf = _gray_info.cur_buffer;
bbuf = _gray_info.back_buffer;
/* precalculate the bit patterns with random shifts
* for all 4 pixels and put them on an extra "stack" */
asm volatile (
"add.l %[ofs],%[cbuf] \n"
"add.l %[ofs],%[bbuf] \n"
"moveq.l #4,%%d3 \n" /* loop count in d3: 4 pixels */
"clr.l %[mask] \n"
".ur_pre_loop: \n"
"clr.l %%d0 \n"
"move.b (%[cbuf])+,%%d0 \n" /* read current buffer */
"clr.l %%d1 \n"
"move.b (%[bbuf]),%%d1 \n" /* read back buffer */
"move.b %%d0,(%[bbuf])+ \n" /* update back buffer */
"clr.l %%d2 \n" /* preset for skipped pixel */
"cmp.l %%d0,%%d1 \n" /* no change? */
"beq.b .ur_skip \n" /* -> skip */
"move.l (%%d0:l:4,%[bpat]),%%d2 \n" /* d2 = bitpattern[byte]; */
"mulu.w #75,%[rnd] \n" /* multiply by 75 */
"add.l #74,%[rnd] \n" /* add another 74 */
/* Since the lower bits are not very random: */
"move.l %[rnd],%%d1 \n"
"lsr.l #8,%%d1 \n" /* get bits 8..15 (need max. 5) */
"and.l %[rmsk],%%d1\n" /* mask out unneeded bits */
"cmp.l %[dpth],%%d1\n" /* random >= depth ? */
"blo.b .ur_ntrim \n"
"sub.l %[dpth],%%d1\n" /* yes: random -= depth; */
".ur_ntrim: \n"
"move.l %%d2,%%d0 \n"
"lsl.l %%d1,%%d0 \n"
"sub.l %[dpth],%%d1\n"
"neg.l %%d1 \n" /* d1 = depth - d1 */
"lsr.l %%d1,%%d2 \n"
"or.l %%d0,%%d2 \n" /* rotated_pattern = d2 | d0 */
"or.l #0x0300,%[mask] \n" /* set mask bit */
".ur_skip: \n"
"lsr.l #2,%[mask] \n" /* shift mask */
"move.l %%d2,-(%[patp]) \n" /* push on pattern stack */
"subq.l #1,%%d3 \n" /* decrease loop count */
"bne.b .ur_pre_loop\n" /* yes: loop */
: /* outputs */
[cbuf]"+a"(cbuf),
[bbuf]"+a"(bbuf),
[patp]"+a"(pat_ptr),
[rnd] "+d"(_gray_random_buffer),
[mask]"=&d"(mask)
: /* inputs */
[ofs] "[mask]"(srcofs_row),
[bpat]"a"(_gray_info.bitpattern),
[dpth]"d"(_gray_info.depth),
[rmsk]"d"(_gray_info.randmask)
: /* clobbers */
"d0", "d1", "d2", "d3"
);
addr = dst_row;
end = addr + MULU16(_gray_info.depth, _gray_info.plane_size);
/* set the bits for all 4 pixels in all bytes according to the
* precalculated patterns on the pattern stack */
asm volatile (
"movem.l (%[patp]),%%d2-%%d5 \n" /* pop all 4 patterns */
"not.l %[mask] \n" /* set mask -> keep mask */
"and.l #0xFF,%[mask] \n"
"beq.b .ur_sloop \n" /* yes: jump to short loop */
".ur_floop: \n" /** full loop (there are bits to keep)**/
"clr.l %%d0 \n"
"lsr.l #1,%%d2 \n" /* shift out mask bit */
"addx.l %%d0,%%d0 \n" /* puts bit into LSB, shifts left by 1 */
"lsl.l #1,%%d0 \n" /* shift by another 1 for a total of 2 */
"lsr.l #1,%%d3 \n"
"addx.l %%d0,%%d0 \n"
"lsl.l #1,%%d0 \n"
"lsr.l #1,%%d4 \n"
"addx.l %%d0,%%d0 \n"
"lsl.l #1,%%d0 \n"
"lsr.l #1,%%d5 \n"
"addx.l %%d0,%%d0 \n"
"move.l %%d0,%%d1 \n" /* duplicate bits 0, 2, 4, 6, ... */
"lsl.l #1,%%d1 \n" /* to 1, 3, 5, 7, ... */
"or.l %%d1,%%d0 \n"
"move.b (%[addr]),%%d1 \n" /* read old value */
"and.l %[mask],%%d1 \n" /* mask out unneeded bits */
"or.l %%d0,%%d1 \n" /* set new bits */
"move.b %%d1,(%[addr]) \n" /* store value to bitplane */
"add.l %[psiz],%[addr] \n" /* advance to next bitplane */
"cmp.l %[addr],%[end] \n" /* last bitplane done? */
"bhi.b .ur_floop \n" /* no: loop */
"bra.b .ur_end \n"
".ur_sloop: \n" /** short loop (nothing to keep) **/
"clr.l %%d0 \n"
"lsr.l #1,%%d2 \n" /* shift out mask bit */
"addx.l %%d0,%%d0 \n" /* puts bit into LSB, shifts left by 1 */
"lsl.l #1,%%d0 \n" /* shift by another 1 for a total of 2 */
"lsr.l #1,%%d3 \n"
"addx.l %%d0,%%d0 \n"
"lsl.l #1,%%d0 \n"
"lsr.l #1,%%d4 \n"
"addx.l %%d0,%%d0 \n"
"lsl.l #1,%%d0 \n"
"lsr.l #1,%%d5 \n"
"addx.l %%d0,%%d0 \n"
"move.l %%d0,%%d1 \n" /* duplicate bits 0, 2, 4, 6, ... */
"lsl.l #1,%%d1 \n" /* to 1, 3, 5, 7, ... */
"or.l %%d1,%%d0 \n"
"move.b %%d0,(%[addr]) \n" /* store byte to bitplane */
"add.l %[psiz],%[addr] \n" /* advance to next bitplane */
"cmp.l %[addr],%[end] \n" /* last bitplane done? */
"bhi.b .ur_sloop \n" /* no: loop */
".ur_end: \n"
: /* outputs */
[addr]"+a"(addr),
[mask]"+d"(mask)
: /* inputs */
[psiz]"r"(_gray_info.plane_size),
[end] "a"(end),
[patp]"a"(pat_ptr)
: /* clobbers */
"d0", "d1", "d2", "d3", "d4", "d5"
);
}
#endif
srcofs_row += _gray_info.height;
dst_row++;
}
while (dst_row < dst_end);
srcofs += _PBLOCK;
dst += _gray_info.width;
}
}
#if CONFIG_CPU == SH7034
/* References to C library routines used in gray_update_rect() */
asm (
".align 2 \n"
".ashlsi3: \n" /* C library routine: */
".long ___ashlsi3 \n" /* shift r4 left by r5, return in r0 */
".lshrsi3: \n" /* C library routine: */
".long ___lshrsi3 \n" /* shift r4 right by r5, return in r0 */
/* both routines preserve r4, destroy r5 and take ~16 cycles */
);
#endif
/* Update the whole greyscale overlay */
void gray_update(void)
{
gray_update_rect(0, 0, _gray_info.width, _gray_info.height);
}
/* Do an lcd_update() to show changes done by rb->lcd_xxx() functions
(in areas of the screen not covered by the greyscale overlay). */
void gray_deferred_lcd_update(void)
{
if (_gray_info.flags & _GRAY_RUNNING)
_gray_info.flags |= _GRAY_DEFERRED_UPDATE;
else
_gray_rb->lcd_update();
}
/*** Screenshot ***/
#define BMP_NUMCOLORS 33
#define BMP_BPP 8
#define BMP_LINESIZE ((LCD_WIDTH + 3) & ~3)
#define BMP_HEADERSIZE (54 + 4 * BMP_NUMCOLORS)
#define BMP_DATASIZE (BMP_LINESIZE * LCD_HEIGHT)
#define BMP_TOTALSIZE (BMP_HEADERSIZE + BMP_DATASIZE)
#define LE16_CONST(x) (x)&0xff, ((x)>>8)&0xff
#define LE32_CONST(x) (x)&0xff, ((x)>>8)&0xff, ((x)>>16)&0xff, ((x)>>24)&0xff
static const unsigned char bmpheader[] =
{
0x42, 0x4d, /* 'BM' */
LE32_CONST(BMP_TOTALSIZE), /* Total file size */
0x00, 0x00, 0x00, 0x00, /* Reserved */
LE32_CONST(BMP_HEADERSIZE), /* Offset to start of pixel data */
0x28, 0x00, 0x00, 0x00, /* Size of (2nd) header */
LE32_CONST(LCD_WIDTH), /* Width in pixels */
LE32_CONST(LCD_HEIGHT), /* Height in pixels */
0x01, 0x00, /* Number of planes (always 1) */
LE16_CONST(BMP_BPP), /* Bits per pixel 1/4/8/16/24 */
0x00, 0x00, 0x00, 0x00, /* Compression mode, 0 = none */
LE32_CONST(BMP_DATASIZE), /* Size of bitmap data */
0xc4, 0x0e, 0x00, 0x00, /* Horizontal resolution (pixels/meter) */
0xc4, 0x0e, 0x00, 0x00, /* Vertical resolution (pixels/meter) */
LE32_CONST(BMP_NUMCOLORS), /* Number of used colours */
LE32_CONST(BMP_NUMCOLORS), /* Number of important colours */
};
#if LCD_DEPTH == 1
#define BMP_RED 0x90
#define BMP_GREEN 0xee
#define BMP_BLUE 0x90
#elif LCD_DEPTH == 2
#define BMP_RED 0xad
#define BMP_GREEN 0xd8
#define BMP_BLUE 0xe6
#endif
static unsigned char linebuf[BMP_LINESIZE];
/* Save the current display content (b&w and greyscale overlay) to an 8-bit
* BMP file in the root directory. */
void gray_screendump(void)
{
int fh, i, bright;
int y;
#if LCD_DEPTH == 1
int x, by, mask;
int gx, gby;
unsigned char *lcdptr, *grayptr, *grayptr2;
#endif
char filename[MAX_PATH];
#ifdef HAVE_RTC
struct tm *tm = _gray_rb->get_time();
_gray_rb->snprintf(filename, MAX_PATH,
"/graydump %04d-%02d-%02d %02d-%02d-%02d.bmp",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
#else
{
DIR* dir;
int max_dump_file = 1; /* default to graydump_0001.bmp */
dir = _gray_rb->opendir("/");
if (dir) /* found */
{
/* Search for the highest screendump filename present,
increment behind that. So even with "holes"
(deleted files), the newest will always have the
highest number. */
while(true)
{
struct dirent* entry;
int curr_dump_file;
/* walk through the directory content */
entry = _gray_rb->readdir(dir);
if (!entry)
{
_gray_rb->closedir(dir);
break; /* end of dir */
}
if (_gray_rb->strncasecmp(entry->d_name, "graydump_", 9))
continue; /* no screendump file */
curr_dump_file = _gray_rb->atoi(&entry->d_name[9]);
if (curr_dump_file >= max_dump_file)
max_dump_file = curr_dump_file + 1;
}
}
_gray_rb->snprintf(filename, MAX_PATH, "/graydump_%04d.bmp",
max_dump_file);
}
#endif
fh = _gray_rb->creat(filename, O_WRONLY);
if (fh < 0)
return;
_gray_rb->write(fh, bmpheader, sizeof(bmpheader)); /* write header */
/* build clut */
linebuf[3] = 0;
for (i = 0; i < BMP_NUMCOLORS; i++)
{
bright = MIN(i, _gray_info.depth);
linebuf[0] = MULU16(BMP_BLUE, bright) / _gray_info.depth;
linebuf[1] = MULU16(BMP_GREEN, bright) / _gray_info.depth;
linebuf[2] = MULU16(BMP_RED, bright) / _gray_info.depth;
_gray_rb->write(fh, linebuf, 4);
}
/* 8-bit BMP image goes bottom -> top */
for (y = LCD_HEIGHT - 1; y >= 0; y--)
{
_gray_rb->memset(linebuf, BMP_NUMCOLORS-1, LCD_WIDTH);
#if LCD_DEPTH == 1
mask = 1 << (y & 7);
by = y >> 3;
lcdptr = _gray_rb->lcd_framebuffer + MULU16(LCD_WIDTH, by);
gby = by - _gray_info.by;
if ((_gray_info.flags & _GRAY_RUNNING)
&& (unsigned) gby < (unsigned) _gray_info.bheight)
{
/* line contains greyscale (and maybe b&w) graphics */
grayptr = _gray_info.plane_data + MULU16(_gray_info.width, gby);
for (x = 0; x < LCD_WIDTH; x++)
{
if (*lcdptr++ & mask)
linebuf[x] = 0;
gx = x - _gray_info.x;
if ((unsigned)gx < (unsigned)_gray_info.width)
{
bright = 0;
grayptr2 = grayptr + gx;
for (i = 0; i < _gray_info.depth; i++)
{
if (!(*grayptr2 & mask))
bright++;
grayptr2 += _gray_info.plane_size;
}
linebuf[x] = bright;
}
}
}
else
{
/* line contains only b&w graphics */
for (x = 0; x < LCD_WIDTH; x++)
if (*lcdptr++ & mask)
linebuf[x] = 0;
}
#elif LCD_DEPTH == 2
/* TODO */
#endif
_gray_rb->write(fh, linebuf, sizeof(linebuf));
}
_gray_rb->close(fh);
}
#endif /* HAVE_LCD_BITMAP */
#endif /* !SIMULATOR */
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