Hi all,
the qemu vnc server changes its internal colour depth based on the
client request. This way just one colour conversion is done: the one in
vga_template.h, from the guest colour depth and the vnc server internal
colour depth.
This patch is meant to remove this colour conversion to improve
performances. It accomplishes the goal making the qemu internal colour
depth always the same as the guest colour depth.
The basic idea is that the vnc client is the one that should do the
colour conversion, if necessary. In general it should accept the pixel
format suggested by the server during the initial negotiation. This
behaviour can be set in most vnc clients (vncviewer included).
If the guest changes colour depth, the qemu vnc server changes colour
depth too and notifies the client. The problem is that the vnc protocol
doesn't provide a message from the server to the client to ask for a
colour depth change. So what I am doing is either:
1) quietly starting to do the conversion on vnc server (not gaining any
performances here);
2) closing the vnc connection with the client, so the client can
reconnect and choose the new pixel format.
By default I am doing 1), however the second choice can be enabled
passing the -vnc-switch-bpp command line option.
In order to do the colour conversion on the vnc server I had to improve
the colour conversion code already in place because it only supported
conversions from 32 bpp. The patch adds colour conversion code that
support conversions from any resolution to any resolution.
A last note: to get most out of this patch it is best to set Windows to
16 bit colour depth, because the 24 bit mode is 24 bit depth and 24 bpp,
meaning no alpha channel. The vnc protocol doesn't support 24 bpp, only
32 bpp, so this conversion is unavoidable.
Comments and critics are welcome.
Best Regards,
Stefano Stabellini
diff -r e6cf98edf0c5 tools/ioemu/console.c
--- a/tools/ioemu/console.c Thu Feb 07 13:21:38 2008 +0000
+++ b/tools/ioemu/console.c Fri Feb 08 16:19:49 2008 +0000
@@ -169,16 +169,12 @@ static unsigned int vga_get_color(Displa
unsigned int r, g, b, color;
switch(ds->depth) {
-#if 0
case 8:
r = (rgba >> 16) & 0xff;
g = (rgba >> 8) & 0xff;
b = (rgba) & 0xff;
- color = (rgb_to_index[r] * 6 * 6) +
- (rgb_to_index[g] * 6) +
- (rgb_to_index[b]);
- break;
-#endif
+ color = ((r >> 5) << 5 | (g >> 5) << 2 | (b >> 6));
+ break;
case 15:
r = (rgba >> 16) & 0xff;
g = (rgba >> 8) & 0xff;
diff -r e6cf98edf0c5 tools/ioemu/hw/vga.c
--- a/tools/ioemu/hw/vga.c Thu Feb 07 13:21:38 2008 +0000
+++ b/tools/ioemu/hw/vga.c Fri Feb 08 16:33:03 2008 +0000
@@ -1071,7 +1071,7 @@ static const uint8_t cursor_glyph[32 * 4
*/
static void vga_draw_text(VGAState *s, int full_update)
{
- int cx, cy, cheight, cw, ch, cattr, height, width, ch_attr;
+ int cx, cy, cheight, cw, ch, cattr, height, width, ch_attr, depth;
int cx_min, cx_max, linesize, x_incr;
uint32_t offset, fgcol, bgcol, v, cursor_offset;
uint8_t *d1, *d, *src, *s1, *dest, *cursor_ptr;
@@ -1134,6 +1134,11 @@ static void vga_draw_text(VGAState *s, i
return;
}
+ depth = s->get_bpp(s);
+ if (depth == 24)
+ depth = 32;
+ if (s->ds->dpy_colourdepth != NULL && s->ds->depth != depth)
+ s->ds->dpy_colourdepth(s->ds, depth);
if (width != s->last_width || height != s->last_height ||
cw != s->last_cw || cheight != s->last_ch) {
s->last_scr_width = width * cw;
@@ -1477,7 +1482,7 @@ void check_sse2(void)
*/
static void vga_draw_graphic(VGAState *s, int full_update)
{
- int y1, y, update, linesize, y_start, double_scan, mask;
+ int y1, y, update, linesize, y_start, double_scan, mask, depth;
int width, height, shift_control, line_offset, bwidth;
ram_addr_t page0, page1;
int disp_width, multi_scan, multi_run;
@@ -1551,6 +1556,11 @@ static void vga_draw_graphic(VGAState *s
}
vga_draw_line = vga_draw_line_table[v * NB_DEPTHS +
get_depth_index(s->ds)];
+ depth = s->get_bpp(s);
+ if (depth == 24)
+ depth = 32;
+ if (s->ds->dpy_colourdepth != NULL && s->ds->depth != depth)
+ s->ds->dpy_colourdepth(s->ds, depth);
if (disp_width != s->last_width ||
height != s->last_height) {
dpy_resize(s->ds, disp_width, height);
diff -r e6cf98edf0c5 tools/ioemu/sdl.c
--- a/tools/ioemu/sdl.c Thu Feb 07 13:21:38 2008 +0000
+++ b/tools/ioemu/sdl.c Sat Feb 09 17:25:14 2008 +0000
@@ -499,6 +499,7 @@ void sdl_display_init(DisplayState *ds,
ds->dpy_update = sdl_update;
ds->dpy_resize = sdl_resize;
ds->dpy_refresh = sdl_refresh;
+ ds->dpy_colourdepth = NULL;
sdl_resize(ds, 640, 400);
sdl_update_caption();
diff -r e6cf98edf0c5 tools/ioemu/vl.c
--- a/tools/ioemu/vl.c Thu Feb 07 13:21:38 2008 +0000
+++ b/tools/ioemu/vl.c Sat Feb 09 17:10:51 2008 +0000
@@ -146,6 +146,7 @@ int nographic;
int nographic;
int vncviewer;
int vncunused;
+int vncswitchbpp;
const char* keyboard_layout = NULL;
int64_t ticks_per_sec;
char *boot_device = NULL;
@@ -4397,6 +4398,7 @@ void dumb_display_init(DisplayState *ds)
ds->depth = 0;
ds->dpy_update = dumb_update;
ds->dpy_resize = dumb_resize;
+ ds->dpy_colourdepth = NULL;
ds->dpy_refresh = dumb_refresh;
}
@@ -6510,6 +6512,7 @@ void help(void)
"-vnc display start a VNC server on display\n"
"-vncviewer start a vncviewer process for this domain\n"
"-vncunused bind the VNC server to an unused port\n"
+ "-vnc-switch-bpp VNC server closes connections when the guest OS
changes colour depth\n"
#ifndef _WIN32
"-daemonize daemonize QEMU after initializing\n"
#endif
@@ -6609,6 +6612,7 @@ enum {
QEMU_OPTION_acpi,
QEMU_OPTION_vncviewer,
QEMU_OPTION_vncunused,
+ QEMU_OPTION_vncswitchbpp,
QEMU_OPTION_pci,
};
@@ -6692,6 +6696,7 @@ const QEMUOption qemu_options[] = {
{ "vnc", HAS_ARG, QEMU_OPTION_vnc },
{ "vncviewer", 0, QEMU_OPTION_vncviewer },
{ "vncunused", 0, QEMU_OPTION_vncunused },
+ { "vnc-switch-bpp", 0, QEMU_OPTION_vncswitchbpp },
/* temporary options */
{ "usb", 0, QEMU_OPTION_usb },
@@ -7103,6 +7108,7 @@ int main(int argc, char **argv)
nographic = 0;
vncviewer = 0;
vncunused = 0;
+ vncswitchbpp = 0;
kernel_filename = NULL;
kernel_cmdline = "";
#ifndef CONFIG_DM
@@ -7531,6 +7537,9 @@ int main(int argc, char **argv)
case QEMU_OPTION_vncunused:
vncunused++;
break;
+ case QEMU_OPTION_vncswitchbpp:
+ vncswitchbpp++;
+ break;
case QEMU_OPTION_pci:
direct_pci = optarg;
break;
@@ -7755,6 +7764,7 @@ int main(int argc, char **argv)
} else if (vnc_display != NULL || vncunused != 0) {
int vnc_display_port;
char password[20];
+ ds->switchbpp = vncswitchbpp;
vnc_display_init(ds);
xenstore_read_vncpasswd(domid, password, sizeof(password));
vnc_display_password(ds, password);
diff -r e6cf98edf0c5 tools/ioemu/vl.h
--- a/tools/ioemu/vl.h Thu Feb 07 13:21:38 2008 +0000
+++ b/tools/ioemu/vl.h Fri Feb 08 16:54:30 2008 +0000
@@ -912,8 +912,11 @@ struct DisplayState {
int height;
void *opaque;
+ int switchbpp;
+
void (*dpy_update)(struct DisplayState *s, int x, int y, int w, int h);
void (*dpy_resize)(struct DisplayState *s, int w, int h);
+ void (*dpy_colourdepth)(struct DisplayState *s, int depth);
void (*dpy_refresh)(struct DisplayState *s);
void (*dpy_copy)(struct DisplayState *s, int src_x, int src_y, int dst_x,
int dst_y, int w, int h);
};
diff -r e6cf98edf0c5 tools/ioemu/vnc.c
--- a/tools/ioemu/vnc.c Thu Feb 07 13:21:38 2008 +0000
+++ b/tools/ioemu/vnc.c Sat Feb 09 18:16:54 2008 +0000
@@ -27,6 +27,7 @@
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
+#include <arpa/inet.h>
#include "vl.h"
#include "qemu_socket.h"
#include <assert.h>
@@ -85,8 +86,8 @@ typedef void VncWritePixels(VncState *vs
typedef void VncSendHextileTile(VncState *vs,
int x, int y, int w, int h,
- uint32_t *last_bg,
- uint32_t *last_fg,
+ void *last_bg,
+ void *last_fg,
int *has_bg, int *has_fg);
#if 0
@@ -187,9 +188,9 @@ struct VncState
VncWritePixels *write_pixels;
VncSendHextileTile *send_hextile_tile;
int pix_bpp, pix_big_endian;
- int red_shift, red_max, red_shift1;
- int green_shift, green_max, green_shift1;
- int blue_shift, blue_max, blue_shift1;
+ int red_shift, red_max, red_shift1, red_max1;
+ int green_shift, green_max, green_shift1, green_max1;
+ int blue_shift, blue_max, blue_shift1, blue_max1;
VncReadEvent *read_handler;
size_t read_handler_expect;
@@ -379,54 +380,67 @@ static void vnc_write_pixels_copy(VncSta
/* slowest but generic code. */
static void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v)
{
- unsigned int r, g, b;
-
- r = (v >> vs->red_shift1) & vs->red_max;
- g = (v >> vs->green_shift1) & vs->green_max;
- b = (v >> vs->blue_shift1) & vs->blue_max;
- v = (r << vs->red_shift) |
- (g << vs->green_shift) |
- (b << vs->blue_shift);
+ uint8_t r, g, b;
+
+ r = ((v >> vs->red_shift1) & vs->red_max1) * (vs->red_max + 1) /
(vs->red_max1 + 1);
+ g = ((v >> vs->green_shift1) & vs->green_max1) * (vs->green_max + 1) /
(vs->green_max1 + 1);
+ b = ((v >> vs->blue_shift1) & vs->blue_max1) * (vs->blue_max + 1) /
(vs->blue_max1 + 1);
switch(vs->pix_bpp) {
case 1:
- buf[0] = v;
+ buf[0] = (r << vs->red_shift) | (g << vs->green_shift) | (b <<
vs->blue_shift);
break;
case 2:
+ {
+ uint16_t *p = (uint16_t *) buf;
+ *p = (r << vs->red_shift) | (g << vs->green_shift) | (b <<
vs->blue_shift);
if (vs->pix_big_endian) {
- buf[0] = v >> 8;
- buf[1] = v;
- } else {
- buf[1] = v >> 8;
- buf[0] = v;
+ *p = htons(*p);
}
+ }
break;
default:
case 4:
+ {
+ uint32_t *p = (uint32_t *) buf;
+ *p = (r << vs->red_shift) | (g << vs->green_shift) | (b <<
vs->blue_shift);
if (vs->pix_big_endian) {
- buf[0] = v >> 24;
- buf[1] = v >> 16;
- buf[2] = v >> 8;
- buf[3] = v;
- } else {
- buf[3] = v >> 24;
- buf[2] = v >> 16;
- buf[1] = v >> 8;
- buf[0] = v;
+ *p = htonl(*p);
}
break;
}
+ }
}
static void vnc_write_pixels_generic(VncState *vs, void *pixels1, int size)
{
- uint32_t *pixels = pixels1;
uint8_t buf[4];
- int n, i;
-
- n = size >> 2;
- for(i = 0; i < n; i++) {
- vnc_convert_pixel(vs, buf, pixels[i]);
- vnc_write(vs, buf, vs->pix_bpp);
+
+ if (vs->depth == 4) {
+ uint32_t *pixels = pixels1;
+ int n, i;
+ n = size >> 2;
+ for(i = 0; i < n; i++) {
+ vnc_convert_pixel(vs, buf, pixels[i]);
+ vnc_write(vs, buf, vs->pix_bpp);
+ }
+ } else if (vs->depth == 2) {
+ uint16_t *pixels = pixels1;
+ int n, i;
+ n = size >> 1;
+ for(i = 0; i < n; i++) {
+ vnc_convert_pixel(vs, buf, pixels[i]);
+ vnc_write(vs, buf, vs->pix_bpp);
+ }
+ } else if (vs->depth == 1) {
+ uint8_t *pixels = pixels1;
+ int n, i;
+ n = size;
+ for(i = 0; i < n; i++) {
+ vnc_convert_pixel(vs, buf, pixels[i]);
+ vnc_write(vs, buf, vs->pix_bpp);
+ }
+ } else {
+ fprintf(stderr, "vnc_write_pixels_generic: VncState color depth not
supported\n");
}
}
@@ -461,6 +475,18 @@ static void hextile_enc_cord(uint8_t *pt
#define BPP 32
#include "vnchextile.h"
#undef BPP
+
+#define GENERIC
+#define BPP 8
+#include "vnchextile.h"
+#undef BPP
+#undef GENERIC
+
+#define GENERIC
+#define BPP 16
+#include "vnchextile.h"
+#undef BPP
+#undef GENERIC
#define GENERIC
#define BPP 32
@@ -472,18 +498,22 @@ static void send_framebuffer_update_hext
{
int i, j;
int has_fg, has_bg;
- uint32_t last_fg32, last_bg32;
+ void *last_fg, *last_bg;
vnc_framebuffer_update(vs, x, y, w, h, 5);
+ last_fg = (void *) malloc(vs->depth);
+ last_bg = (void *) malloc(vs->depth);
has_fg = has_bg = 0;
for (j = y; j < (y + h); j += 16) {
for (i = x; i < (x + w); i += 16) {
vs->send_hextile_tile(vs, i, j,
MIN(16, x + w - i), MIN(16, y + h - j),
- &last_bg32, &last_fg32, &has_bg, &has_fg);
- }
- }
+ last_bg, last_fg, &has_bg, &has_fg);
+ }
+ }
+ free(last_fg);
+ free(last_bg);
}
static void send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
@@ -1306,17 +1336,6 @@ static void set_encodings(VncState *vs,
check_pointer_type_change(vs, kbd_mouse_is_absolute());
}
-static int compute_nbits(unsigned int val)
-{
- int n;
- n = 0;
- while (val != 0) {
- n++;
- val >>= 1;
- }
- return n;
-}
-
static void set_pixel_format(VncState *vs,
int bits_per_pixel, int depth,
int big_endian_flag, int true_color_flag,
@@ -1335,23 +1354,24 @@ static void set_pixel_format(VncState *v
vnc_client_error(vs);
return;
}
- if (bits_per_pixel == 32 &&
+ if (bits_per_pixel == 32 &&
+ bits_per_pixel == vs->depth * 8 &&
host_big_endian_flag == big_endian_flag &&
red_max == 0xff && green_max == 0xff && blue_max == 0xff &&
red_shift == 16 && green_shift == 8 && blue_shift == 0) {
- vs->depth = 4;
vs->write_pixels = vnc_write_pixels_copy;
vs->send_hextile_tile = send_hextile_tile_32;
} else
- if (bits_per_pixel == 16 &&
+ if (bits_per_pixel == 16 &&
+ bits_per_pixel == vs->depth * 8 &&
host_big_endian_flag == big_endian_flag &&
red_max == 31 && green_max == 63 && blue_max == 31 &&
red_shift == 11 && green_shift == 5 && blue_shift == 0) {
- vs->depth = 2;
vs->write_pixels = vnc_write_pixels_copy;
vs->send_hextile_tile = send_hextile_tile_16;
} else
if (bits_per_pixel == 8 &&
+ bits_per_pixel == vs->depth * 8 &&
red_max == 7 && green_max == 7 && blue_max == 3 &&
red_shift == 5 && green_shift == 2 && blue_shift == 0) {
vs->depth = 1;
@@ -1364,26 +1384,109 @@ static void set_pixel_format(VncState *v
bits_per_pixel != 16 &&
bits_per_pixel != 32)
goto fail;
- vs->depth = 4;
- vs->red_shift = red_shift;
- vs->red_max = red_max;
- vs->red_shift1 = 24 - compute_nbits(red_max);
- vs->green_shift = green_shift;
- vs->green_max = green_max;
- vs->green_shift1 = 16 - compute_nbits(green_max);
- vs->blue_shift = blue_shift;
- vs->blue_max = blue_max;
- vs->blue_shift1 = 8 - compute_nbits(blue_max);
- vs->pix_bpp = bits_per_pixel / 8;
+ if (vs->depth == 4) {
+ vs->send_hextile_tile = send_hextile_tile_generic_32;
+ } else if (vs->depth == 2) {
+ vs->send_hextile_tile = send_hextile_tile_generic_16;
+ } else {
+ vs->send_hextile_tile = send_hextile_tile_generic_8;
+ }
+
vs->pix_big_endian = big_endian_flag;
vs->write_pixels = vnc_write_pixels_generic;
- vs->send_hextile_tile = send_hextile_tile_generic;
- }
-
- vnc_dpy_resize(vs->ds, vs->ds->width, vs->ds->height);
+ }
+
+ vs->red_shift = red_shift;
+ vs->red_max = red_max;
+ vs->green_shift = green_shift;
+ vs->green_max = green_max;
+ vs->blue_shift = blue_shift;
+ vs->blue_max = blue_max;
+ vs->pix_bpp = bits_per_pixel / 8;
vga_hw_invalidate();
vga_hw_update();
+}
+
+static void vnc_dpy_colourdepth(DisplayState *ds, int depth)
+{
+ int host_big_endian_flag;
+ struct VncState *vs;
+
+ if (!depth) return;
+
+#ifdef WORDS_BIGENDIAN
+ host_big_endian_flag = 1;
+#else
+ host_big_endian_flag = 0;
+#endif
+ vs = ds->opaque;
+
+ switch (depth) {
+ case 8:
+ vs->depth = depth / 8;
+ vs->red_max1 = 7;
+ vs->green_max1 = 7;
+ vs->blue_max1 = 3;
+ vs->red_shift1 = 5;
+ vs->green_shift1 = 2;
+ vs->blue_shift1 = 0;
+ break;
+ case 16:
+ vs->depth = depth / 8;
+ vs->red_max1 = 31;
+ vs->green_max1 = 63;
+ vs->blue_max1 = 31;
+ vs->red_shift1 = 11;
+ vs->green_shift1 = 5;
+ vs->blue_shift1 = 0;
+ break;
+ case 32:
+ vs->depth = 4;
+ vs->red_max1 = 255;
+ vs->green_max1 = 255;
+ vs->blue_max1 = 255;
+ vs->red_shift1 = 16;
+ vs->green_shift1 = 8;
+ vs->blue_shift1 = 0;
+ break;
+ default:
+ return;
+ }
+ if (ds->switchbpp) {
+ vnc_client_error(vs);
+ } else {
+ if (vs->pix_bpp == 4 && vs->depth == 4 &&
+ host_big_endian_flag == vs->pix_big_endian &&
+ vs->red_max == 0xff && vs->green_max == 0xff && vs->blue_max ==
0xff &&
+ vs->red_shift == 16 && vs->green_shift == 8 && vs->blue_shift ==
0) {
+ vs->write_pixels = vnc_write_pixels_copy;
+ vs->send_hextile_tile = send_hextile_tile_32;
+ } else if (vs->pix_bpp == 2 && vs->depth == 2 &&
+ host_big_endian_flag == vs->pix_big_endian &&
+ vs->red_max == 31 && vs->green_max == 63 && vs->blue_max == 31 &&
+ vs->red_shift == 11 && vs->green_shift == 5 && vs->blue_shift ==
0) {
+ vs->write_pixels = vnc_write_pixels_copy;
+ vs->send_hextile_tile = send_hextile_tile_16;
+ } else if (vs->pix_bpp == 1 && vs->depth == 1 &&
+ host_big_endian_flag == vs->pix_big_endian &&
+ vs->red_max == 7 && vs->green_max == 7 && vs->blue_max == 3 &&
+ vs->red_shift == 5 && vs->green_shift == 2 && vs->blue_shift == 0)
{
+ vs->write_pixels = vnc_write_pixels_copy;
+ vs->send_hextile_tile = send_hextile_tile_8;
+ } else {
+ if (vs->depth == 4) {
+ vs->send_hextile_tile = send_hextile_tile_generic_32;
+ } else if (vs->depth == 2) {
+ vs->send_hextile_tile = send_hextile_tile_generic_16;
+ } else {
+ vs->send_hextile_tile = send_hextile_tile_generic_8;
+ }
+ vs->write_pixels = vnc_write_pixels_generic;
+ }
+ }
+
+ vnc_dpy_resize(ds, ds->width, ds->height);
}
static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
@@ -1483,7 +1586,9 @@ static int protocol_client_init(VncState
vnc_write_u16(vs, vs->ds->height);
vnc_write_u8(vs, vs->depth * 8); /* bits-per-pixel */
- vnc_write_u8(vs, vs->depth * 8); /* depth */
+ if (vs->depth == 4) vnc_write_u8(vs, 24); /* depth */
+ else vnc_write_u8(vs, vs->depth * 8); /* depth */
+
#ifdef WORDS_BIGENDIAN
vnc_write_u8(vs, 1); /* big-endian-flag */
#else
@@ -2160,7 +2265,6 @@ void vnc_display_init(DisplayState *ds)
vs->lsock = -1;
vs->csock = -1;
- vs->depth = 4;
vs->last_x = -1;
vs->last_y = -1;
@@ -2177,9 +2281,12 @@ void vnc_display_init(DisplayState *ds)
vs->ds->data = NULL;
vs->ds->dpy_update = vnc_dpy_update;
vs->ds->dpy_resize = vnc_dpy_resize;
+ vs->ds->dpy_colourdepth = vnc_dpy_colourdepth;
vs->ds->dpy_refresh = vnc_dpy_refresh;
- vnc_dpy_resize(vs->ds, 640, 400);
+ vs->ds->width = 640;
+ vs->ds->height = 400;
+ vnc_dpy_colourdepth(vs->ds, 32);
}
#if CONFIG_VNC_TLS
diff -r e6cf98edf0c5 tools/ioemu/vnchextile.h
--- a/tools/ioemu/vnchextile.h Thu Feb 07 13:21:38 2008 +0000
+++ b/tools/ioemu/vnchextile.h Fri Feb 08 16:29:50 2008 +0000
@@ -2,29 +2,29 @@
#define CONCAT(a, b) CONCAT_I(a, b)
#define pixel_t CONCAT(uint, CONCAT(BPP, _t))
#ifdef GENERIC
-#define NAME generic
+#define NAME CONCAT(generic_, BPP)
#else
#define NAME BPP
#endif
static void CONCAT(send_hextile_tile_, NAME)(VncState *vs,
int x, int y, int w, int h,
- uint32_t *last_bg32,
- uint32_t *last_fg32,
+ void *last_bg_,
+ void *last_fg_,
int *has_bg, int *has_fg)
{
uint8_t *row = (vs->ds->data + y * vs->ds->linesize + x * vs->depth);
pixel_t *irow = (pixel_t *)row;
int j, i;
- pixel_t *last_bg = (pixel_t *)last_bg32;
- pixel_t *last_fg = (pixel_t *)last_fg32;
+ pixel_t *last_bg = (pixel_t *)last_bg_;
+ pixel_t *last_fg = (pixel_t *)last_fg_;
pixel_t bg = 0;
pixel_t fg = 0;
int n_colors = 0;
int bg_count = 0;
int fg_count = 0;
int flags = 0;
- uint8_t data[(sizeof(pixel_t) + 2) * 16 * 16];
+ uint8_t data[(vs->pix_bpp + 2) * 16 * 16];
int n_data = 0;
int n_subtiles = 0;
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