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Removed the grayscale framework, gets linked in from the plugin lib instead

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4652 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2004-05-19 17:19:11 +00:00
parent 71c83b9b6b
commit 6920aed858
1 changed files with 21 additions and 538 deletions
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559
apps/plugins/mandelbrot.c
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@ -21,6 +21,7 @@
#include "plugin.h"
#ifdef HAVE_LCD_BITMAP // this is not fun on the player
# include "gray.h"
static struct plugin_api* rb;
static char buff[32];
@ -34,527 +35,6 @@ static int max_iter;
static unsigned char *gbuf;
static unsigned int gbuf_size = 0;
/*********************** Begin grayscale framework *************************/
/* This is a generic framework to use grayscale display within rockbox
* plugins. It obviously does not work for the player.
*
* If you want to use grayscale display within a plugin, copy this section
* (up to "End grayscale framework") into your source and you are able to use
* it. For detailed documentation look at the head of each public function.
*
* It requires a global Rockbox api pointer in "rb" and uses the rockbox
* timer api so you cannot use that timer for other purposes while
* displaying grayscale.
*
* The framework consists of 3 sections:
*
* - internal core functions and definitions
* - public core functions
* - public optional functions
*
* Usually you will use functions from the latter two sections in your code.
* You can cut out functions from the third section that you do not need in
* order to not waste space. Don't forget to cut the prototype as well.
*/
/**** internal core functions and definitions ****/
/* 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 */
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;
/** prototypes **/
void timer_isr(void);
void graypixel(int x, int y, unsigned long pattern);
void grayinvertmasked(int x, int yb, unsigned char mask);
/** implementation **/
/* timer interrupt handler: display next bitplane */
void timer_isr(void)
{
rb->lcd_blit(graybuf->data + (graybuf->plane_size * graybuf->cur_plane),
graybuf->x, graybuf->by, graybuf->width, graybuf->bheight,
graybuf->width);
if (++graybuf->cur_plane >= graybuf->depth)
graybuf->cur_plane = 0;
if (graybuf->flags & GRAY_DEFERRED_UPDATE) /* lcd_update() requested? */
{
int x1 = MAX(graybuf->x, 0);
int x2 = MIN(graybuf->x + graybuf->width, LCD_WIDTH);
int y1 = MAX(graybuf->by << 3, 0);
int y2 = MIN((graybuf->by + graybuf->bheight) << 3, LCD_HEIGHT);
if (y1 > 0) /* refresh part above overlay, full width */
rb->lcd_update_rect(0, 0, LCD_WIDTH, y1);
if (y2 < LCD_HEIGHT) /* refresh part below overlay, full width */
rb->lcd_update_rect(0, y2, LCD_WIDTH, LCD_HEIGHT - y2);
if (x1 > 0) /* refresh part to the left of overlay */
rb->lcd_update_rect(0, y1, x1, y2 - y1);
if (x2 < LCD_WIDTH) /* refresh part to the right of overlay */
rb->lcd_update_rect(x2, y1, LCD_WIDTH - x2, y2 - y1);
graybuf->flags &= ~GRAY_DEFERRED_UPDATE; /* clear request */
}
}
/* Set a pixel to a specific bit pattern
* This is the fundamental graphics primitive, asm optimized */
void graypixel(int x, int y, unsigned long pattern)
{
static short random_buffer;
register long address, mask, random;
/* Some (pseudo-)random function must be used here to shift the bit
* pattern randomly, otherwise you would get flicker and/or moire.
* Since rand() is relatively slow, I've implemented a simple, but very
* fast pseudo-random generator based on linear congruency in assembler.
* It delivers 16 pseudo-random bits in each iteration. */
/* simple but fast pseudo-random generator */
asm(
"mov.w @%1,%0 \n" /* load last value */
"mov #75,r1 \n"
"mulu %0,r1 \n" /* multiply by 75 */
"sts macl,%0 \n" /* get result */
"add #74,%0 \n" /* add another 74 */
"mov.w %0,@%1 \n" /* store new value */
/* Since the lower bits are not very random: */
"shlr8 %0 \n" /* get bits 8..15 (need max. 5) */
"and %2,%0 \n" /* mask out unneeded bits */
: /* outputs */
/* %0 */ "=&r"(random)
: /* inputs */
/* %1 */ "r"(&random_buffer),
/* %2 */ "r"(graybuf->randmask)
: /* clobbers */
"r1","macl"
);
/* precalculate mask and byte address in first bitplane */
asm(
"mov %3,%0 \n" /* take y as base for address offset */
"shlr2 %0 \n" /* shift right by 3 (= divide by 8) */
"shlr %0 \n"
"mulu %0,%2 \n" /* multiply with width */
"and #7,%3 \n" /* get lower 3 bits of y */
"sts macl,%0 \n" /* get mulu result */
"add %4,%0 \n" /* add base + x to get final address */
"mov %3,%1 \n" /* move lower 3 bits of y out of r0 */
"mova .pp_table,%3 \n" /* get address of mask table in r0 */
"bra .pp_end \n" /* skip the table */
"mov.b @(%3,%1),%1 \n" /* get entry from mask table */
".align 2 \n"
".pp_table: \n" /* mask table */
".byte 0x01 \n"
".byte 0x02 \n"
".byte 0x04 \n"
".byte 0x08 \n"
".byte 0x10 \n"
".byte 0x20 \n"
".byte 0x40 \n"
".byte 0x80 \n"
".pp_end: \n"
: /* outputs */
/* %0 */ "=&r"(address),
/* %1 */ "=&r"(mask)
: /* inputs */
/* %2 */ "r"(graybuf->width),
/* %3 = r0 */ "z"(y),
/* %4 */ "r"(graybuf->data + x)
: /* clobbers */
"macl"
);
/* the hard part: set bits in all bitplanes according to pattern */
asm(
"cmp/hs %1,%5 \n" /* random >= depth ? */
"bf .p_ntrim \n"
"sub %1,%5 \n" /* yes: random -= depth */
/* it's sufficient to do this once, since the mask guarantees
* random < 2 * depth */
".p_ntrim: \n"
/* calculate some addresses */
"mulu %4,%1 \n" /* end address offset */
"not %3,r1 \n" /* get inverse mask (for "and") */
"sts macl,%1 \n" /* result of mulu */
"mulu %4,%5 \n" /* address offset of <random>'th plane */
"add %2,%1 \n" /* end offset -> end address */
"sts macl,%5 \n" /* result of mulu */
"add %2,%5 \n" /* address of <random>'th plane */
"bra .p_start1 \n"
"mov %5,r2 \n" /* copy address */
/* first loop: set bits from <random>'th bitplane to last */
".p_loop1: \n"
"mov.b @r2,r3 \n" /* get data byte */
"shlr %0 \n" /* shift bit mask, sets t bit */
"and r1,r3 \n" /* reset bit (-> "white") */
"bf .p_white1 \n" /* t=0? -> "white" bit */
"or %3,r3 \n" /* set bit ("black" bit) */
".p_white1: \n"
"mov.b r3,@r2 \n" /* store data byte */
"add %4,r2 \n" /* advance address to next bitplane */
".p_start1: \n"
"cmp/hi r2,%1 \n" /* address < end address ? */
"bt .p_loop1 \n"
"bra .p_start2 \n"
"nop \n"
/* second loop: set bits from first to <random-1>'th bitplane
* Bit setting works the other way round here to equalize average
* execution times for bright and dark pixels */
".p_loop2: \n"
"mov.b @%2,r3 \n" /* get data byte */
"shlr %0 \n" /* shift bit mask, sets t bit */
"or %3,r3 \n" /* set bit (-> "black") */
"bt .p_black2 \n" /* t=1? -> "black" bit */
"and r1,r3 \n" /* reset bit ("white" bit) */
".p_black2: \n"
"mov.b r3,@%2 \n" /* store data byte */
"add %4,%2 \n" /* advance address to next bitplane */
".p_start2: \n"
"cmp/hi %2,%5 \n" /* address < <random>'th address ? */
"bt .p_loop2 \n"
: /* outputs */
: /* inputs */
/* %0 */ "r"(pattern),
/* %1 */ "r"(graybuf->depth),
/* %2 */ "r"(address),
/* %3 */ "r"(mask),
/* %4 */ "r"(graybuf->plane_size),
/* %5 */ "r"(random)
: /* clobbers */
"r1", "r2", "r3", "macl"
);
}
/* Invert the bits for 1-8 pixels within the buffer */
void grayinvertmasked(int x, int by, unsigned char mask)
{
asm(
"mulu %4,%5 \n" /* width * by (offset of row) */
"mov #0,r1 \n" /* current_plane = 0 */
"sts macl,r2 \n" /* get mulu result */
"add r2,%1 \n" /* -> address in 1st bitplane */
".i_loop: \n"
"mov.b @%1,r2 \n" /* get data byte */
"add #1,r1 \n" /* current_plane++; */
"xor %2,r2 \n" /* invert bits */
"mov.b r2,@%1 \n" /* store data byte */
"add %3,%1 \n" /* advance address to next bitplane */
"cmp/hi r1,%0 \n" /* current_plane < depth ? */
"bt .i_loop \n"
: /* outputs */
: /* inputs */
/* %0 */ "r"(graybuf->depth),
/* %1 */ "r"(graybuf->data + x),
/* %2 */ "r"(mask),
/* %3 */ "r"(graybuf->plane_size),
/* %4 */ "r"(graybuf->width),
/* %5 */ "r"(by)
: /* clobbers */
"r1", "r2", "macl"
);
}
/*** public core functions ***/
/** prototypes **/
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);
/** implementation **/
/* Prepare the grayscale display buffer
*
* arguments:
* gbuf = pointer to the memory area to use (e.g. plugin buffer)
* gbuf_size = max usable size of the buffer
* width = width in pixels (1..112)
* bheight = height in 8-pixel units (1..8)
* depth = desired number of shades - 1 (1..32)
*
* 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 (black & white)
*
* You can request any depth from 1 to 32, 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 will
* only deliver black & white display.
*
* The total memory needed can be calculated as follows:
* total_mem =
* sizeof(tGraymap) (= 48 bytes currently)
* + sizeof(long) (= 4 bytes)
* + (width * bheight + sizeof(long)) * depth
* + 0..3 (longword alignment of grayscale display buffer)
*/
int gray_init_buffer(unsigned char *gbuf, int gbuf_size, int width,
int bheight, int depth)
{
int possible_depth, plane_size;
int i, j;
if (width > LCD_WIDTH || bheight > (LCD_HEIGHT >> 3) || depth < 1)
return 0;
while ((unsigned long)gbuf & 3) /* the buffer has to be long aligned */
{
gbuf++;
gbuf_size--;
}
plane_size = width * bheight;
possible_depth = (gbuf_size - sizeof(tGraybuf) - sizeof(unsigned long))
/ (plane_size + sizeof(unsigned long));
if (possible_depth < 1)
return 0;
depth = MIN(depth, 32);
depth = MIN(depth, possible_depth);
graybuf = (tGraybuf *) gbuf; /* global pointer to buffer structure */
graybuf->x = 0;
graybuf->by = 0;
graybuf->width = width;
graybuf->height = bheight << 3;
graybuf->bheight = bheight;
graybuf->plane_size = plane_size;
graybuf->depth = depth;
graybuf->cur_plane = 0;
graybuf->flags = 0;
graybuf->data = gbuf + sizeof(tGraybuf);
graybuf->bitpattern = (unsigned long *) (graybuf->data
+ depth * plane_size);
i = depth;
j = 8;
while (i != 0)
{
i >>= 1;
j--;
}
graybuf->randmask = 0xFF >> j;
/* initial state is all white */
rb->memset(graybuf->data, 0, depth * plane_size);
/* 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 */
graybuf->bitpattern[i] = pattern;
}
return depth;
}
/* Release the grayscale display buffer
*
* Switches the grayscale overlay off at first if it is still running,
* then sets the pointer to NULL.
* DO CALL either this function or at least gray_show_display(false)
* before you exit, otherwise nasty things may happen.
*/
void gray_release_buffer(void)
{
gray_show_display(false);
graybuf = NULL;
}
/* Set position of the top left corner of the grayscale overlay
*
* arguments:
* x = left margin in pixels
* by = top margin in 8-pixel units
*
* You may set this in a way that the overlay spills across the right or
* bottom display border. In this case it will simply be clipped by the
* LCD controller. You can even set negative values, this will clip at the
* left or top border. I did not test it, but the limits may be +127 / -128
*
* If you use this while the grayscale overlay is running, the now-freed area
* will be restored.
*/
void gray_position_display(int x, int by)
{
if (graybuf == NULL)
return;
graybuf->x = x;
graybuf->by = by;
if (graybuf->flags & GRAY_RUNNING)
graybuf->flags |= GRAY_DEFERRED_UPDATE;
}
/* Switch the grayscale overlay on or off
*
* arguments:
* enable = true: the grayscale overlay is switched on if initialized
* = false: the grayscale overlay is switched off and the regular lcd
* content is restored
*
* DO NOT call lcd_update() or any other api function that directly accesses
* the lcd while the grayscale overlay is running! If you need to do
* lcd_update() to update something outside the grayscale 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()
*
* The grayscale display consumes ~50 % CPU power (for a full screen overlay,
* less if the overlay is smaller) when switched on. You can switch the overlay
* on and off as many times as you want.
*/
void gray_show_display(bool enable)
{
if (graybuf == NULL)
return;
if (enable)
{
graybuf->flags |= GRAY_RUNNING;
rb->plugin_register_timer(FREQ / 67, 1, timer_isr);
}
else
{
rb->plugin_unregister_timer();
graybuf->flags &= ~GRAY_RUNNING;
rb->lcd_update(); /* restore whatever there was before */
}
}
/*** public optional functions ***/
/* Here are the various graphics primitives. Cut out functions you do not
* need in order to keep plugin code size down.
*/
/** prototypes **/
/* 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_up1(bool black_border);
//void gray_scroll_down1(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);
/** implementation **/
/* Clear the grayscale display (sets all pixels to white)
*/
void gray_clear_display(void)
{
if (graybuf == NULL)
return;
rb->memset(graybuf->data, 0, graybuf->depth * graybuf->plane_size);
}
/* Set a pixel to a specific gray value
*
* brightness is 0..255 (black to white) regardless of real bit depth
*/
void gray_drawpixel(int x, int y, int brightness)
{
if (graybuf == NULL || x >= graybuf->width || y >= graybuf->height
|| brightness > 255)
return;
graypixel(x, y, graybuf->bitpattern[(brightness
* (graybuf->depth + 1)) >> 8]);
}
/*********************** end grayscale framework ***************************/
void init_mandelbrot_set(void){
x_min = -5<<25; // -2.0<<26
@ -603,17 +83,17 @@ void calc_mandelbrot_set(void){
y = 2 * x * y + b;
x = x2 - y2 + a;
}
// "coloring"
brightness = 0;
brightness = 0;
if (n_iter > max_iter){
brightness = 0; // black
} else {
brightness = 255 - (31 * (n_iter & 7));
}
gray_drawpixel( x_pixel, y_pixel, brightness);
}
brightness = 0; // black
} else {
brightness = 255 - (31 * (n_iter & 7));
}
gray_drawpixel( x_pixel, y_pixel, brightness);
}
}
}
@ -627,19 +107,22 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
rb = api;
(void)parameter;
/* This plugin uses the grayscale framework, so initialize */
gray_init(api);
/* get the remainder of the plugin buffer */
gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size);
/* initialize the grayscale buffer:
* 112 pixels wide, 8 rows (64 pixels) high, (try to) reserve
* 16 bitplanes for 17 shades of gray.*/
grayscales = gray_init_buffer(gbuf, gbuf_size, 112, 8, 16) + 1;
grayscales = gray_init_buffer(gbuf, gbuf_size, 112, 8, 16, NULL) + 1;
if (grayscales != 17){
rb->snprintf(buff, sizeof(buff), "%d", grayscales);
rb->lcd_puts(0, 1, buff);
rb->lcd_update();
rb->sleep(HZ*2);
return(0);
rb->snprintf(buff, sizeof(buff), "%d", grayscales);
rb->lcd_puts(0, 1, buff);
rb->lcd_update();
rb->sleep(HZ*2);
return(0);
}
gray_show_display(true); /* switch on grayscale overlay */
@ -667,7 +150,7 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
delta = (x_max - x_min) >> 3;
redraw = true;
break;
case BUTTON_PLAY:
x_min += ((delta>>13)*(lcd_aspect_ratio>>13));
@ -677,7 +160,7 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
delta = (x_max - x_min) >> 3;
redraw = true;
break;
case BUTTON_UP:
y_min -= delta;
y_max -= delta;