Archipelago » qemu

/*

 * QEMU VNC display driver

 * 

 * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>

 * Copyright (C) 2006 Fabrice Bellard

 * 

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "vl.h"

#include "qemu_socket.h"

#define VNC_REFRESH_INTERVAL (1000 / 30)

#include "vnc_keysym.h"

#include "keymaps.c"

typedef struct Buffer

{

    size_t capacity;

    size_t offset;

    char *buffer;

} Buffer;

typedef struct VncState VncState;

typedef int VncReadEvent(VncState *vs, char *data, size_t len);

typedef void VncWritePixels(VncState *vs, void *data, int size);

typedef void VncSendHextileTile(VncState *vs,

                                int x, int y, int w, int h,

                                uint32_t *last_bg, 

                                uint32_t *last_fg,

                                int *has_bg, int *has_fg);

#define VNC_MAX_WIDTH 2048

#define VNC_MAX_HEIGHT 2048

#define VNC_DIRTY_WORDS (VNC_MAX_WIDTH / (16 * 32))

struct VncState

{

    QEMUTimer *timer;

    int lsock;

    int csock;

    DisplayState *ds;

    int need_update;

    int width;

    int height;

    uint32_t dirty_row[VNC_MAX_HEIGHT][VNC_DIRTY_WORDS];

    char *old_data;

    int depth; /* internal VNC frame buffer byte per pixel */

    int has_resize;

    int has_hextile;

    Buffer output;

    Buffer input;

    kbd_layout_t *kbd_layout;

    /* current output mode information */

    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;

    VncReadEvent *read_handler;

    size_t read_handler_expect;

    /* input */

    uint8_t modifiers_state[256];

};

/* TODO

   1) Get the queue working for IO.

   2) there is some weirdness when using the -S option (the screen is grey

      and not totally invalidated

   3) resolutions > 1024

*/

static void vnc_write(VncState *vs, const void *data, size_t len);

static void vnc_write_u32(VncState *vs, uint32_t value);

static void vnc_write_s32(VncState *vs, int32_t value);

static void vnc_write_u16(VncState *vs, uint16_t value);

static void vnc_write_u8(VncState *vs, uint8_t value);

static void vnc_flush(VncState *vs);

static void vnc_update_client(void *opaque);

static void vnc_client_read(void *opaque);

static inline void vnc_set_bit(uint32_t *d, int k)

{

    d[k >> 5] |= 1 << (k & 0x1f);

}

static inline void vnc_clear_bit(uint32_t *d, int k)

{

    d[k >> 5] &= ~(1 << (k & 0x1f));

}

static inline void vnc_set_bits(uint32_t *d, int n, int nb_words)

{

    int j;

    j = 0;

    while (n >= 32) {

        d[j++] = -1;

        n -= 32;

    }

    if (n > 0) 

        d[j++] = (1 << n) - 1;

    while (j < nb_words)

        d[j++] = 0;

}

static inline int vnc_get_bit(const uint32_t *d, int k)

{

    return (d[k >> 5] >> (k & 0x1f)) & 1;

}

static inline int vnc_and_bits(const uint32_t *d1, const uint32_t *d2, 

                               int nb_words)

{

    int i;

    for(i = 0; i < nb_words; i++) {

        if ((d1[i] & d2[i]) != 0)

            return 1;

    }

    return 0;

}

static void vnc_dpy_update(DisplayState *ds, int x, int y, int w, int h)

{

    VncState *vs = ds->opaque;

    int i;

    h += y;

    for (; y < h; y++)

        for (i = 0; i < w; i += 16)

            vnc_set_bit(vs->dirty_row[y], (x + i) / 16);

}

static void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,

                                   int32_t encoding)

{

    vnc_write_u16(vs, x);

    vnc_write_u16(vs, y);

    vnc_write_u16(vs, w);

    vnc_write_u16(vs, h);

    vnc_write_s32(vs, encoding);

}

static void vnc_dpy_resize(DisplayState *ds, int w, int h)

{

    VncState *vs = ds->opaque;

    ds->data = realloc(ds->data, w * h * vs->depth);

    vs->old_data = realloc(vs->old_data, w * h * vs->depth);

    if (ds->data == NULL || vs->old_data == NULL) {

        fprintf(stderr, "vnc: memory allocation failed\n");

        exit(1);

    }

    ds->depth = vs->depth * 8;

    ds->width = w;

    ds->height = h;

    ds->linesize = w * vs->depth;

    if (vs->csock != -1 && vs->has_resize) {

        vnc_write_u8(vs, 0);  /* msg id */

        vnc_write_u8(vs, 0);

        vnc_write_u16(vs, 1); /* number of rects */

        vnc_framebuffer_update(vs, 0, 0, ds->width, ds->height, -223);

        vnc_flush(vs);

        vs->width = ds->width;

        vs->height = ds->height;

    }

}

/* fastest code */

static void vnc_write_pixels_copy(VncState *vs, void *pixels, int size)

{

    vnc_write(vs, pixels, size);

}

/* 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);

    switch(vs->pix_bpp) {

    case 1:

        buf[0] = v;

        break;

    case 2:

        if (vs->pix_big_endian) {

            buf[0] = v >> 8;

            buf[1] = v;

        } else {

            buf[1] = v >> 8;

            buf[0] = v;

        }

        break;

    default:

    case 4:

        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;

        }

        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);

    }

}

static void send_framebuffer_update_raw(VncState *vs, int x, int y, int w, int h)

{

    int i;

    char *row;

    vnc_framebuffer_update(vs, x, y, w, h, 0);

    row = vs->ds->data + y * vs->ds->linesize + x * vs->depth;

    for (i = 0; i < h; i++) {

        vs->write_pixels(vs, row, w * vs->depth);

        row += vs->ds->linesize;

    }

}

static void hextile_enc_cord(uint8_t *ptr, int x, int y, int w, int h)

{

    ptr[0] = ((x & 0x0F) << 4) | (y & 0x0F);

    ptr[1] = (((w - 1) & 0x0F) << 4) | ((h - 1) & 0x0F);

}

#define BPP 8

#include "vnchextile.h"

#undef BPP

#define BPP 16

#include "vnchextile.h"

#undef BPP

#define BPP 32

#include "vnchextile.h"

#undef BPP

#define GENERIC

#define BPP 32

#include "vnchextile.h"

#undef BPP

#undef GENERIC

static void send_framebuffer_update_hextile(VncState *vs, int x, int y, int w, int h)

{

    int i, j;

    int has_fg, has_bg;

    uint32_t last_fg32, last_bg32;

    vnc_framebuffer_update(vs, x, y, w, h, 5);

    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);

        }

    }

}

static void send_framebuffer_update(VncState *vs, int x, int y, int w, int h)

{

        if (vs->has_hextile)

            send_framebuffer_update_hextile(vs, x, y, w, h);

        else

            send_framebuffer_update_raw(vs, x, y, w, h);

}

static void vnc_copy(DisplayState *ds, int src_x, int src_y, int dst_x, int dst_y, int w, int h)

{

    int src, dst;

    char *src_row;

    char *dst_row;

    char *old_row;

    int y = 0;

    int pitch = ds->linesize;

    VncState *vs = ds->opaque;

    vnc_update_client(vs);

    if (dst_y > src_y) {

        y = h - 1;

        pitch = -pitch;

    }

    src = (ds->linesize * (src_y + y) + vs->depth * src_x);

    dst = (ds->linesize * (dst_y + y) + vs->depth * dst_x);

    src_row = ds->data + src;

    dst_row = ds->data + dst;

    old_row = vs->old_data + dst;

    for (y = 0; y < h; y++) {

        memmove(old_row, src_row, w * vs->depth);

        memmove(dst_row, src_row, w * vs->depth);

        src_row += pitch;

        dst_row += pitch;

        old_row += pitch;

    }

    vnc_write_u8(vs, 0);  /* msg id */

    vnc_write_u8(vs, 0);

    vnc_write_u16(vs, 1); /* number of rects */

    vnc_framebuffer_update(vs, dst_x, dst_y, w, h, 1);

    vnc_write_u16(vs, src_x);

    vnc_write_u16(vs, src_y);

    vnc_flush(vs);

}

static int find_dirty_height(VncState *vs, int y, int last_x, int x)

{

    int h;

    for (h = 1; h < (vs->height - y); h++) {

        int tmp_x;

        if (!vnc_get_bit(vs->dirty_row[y + h], last_x))

            break;

        for (tmp_x = last_x; tmp_x < x; tmp_x++)

            vnc_clear_bit(vs->dirty_row[y + h], tmp_x);

    }

    return h;

}

static void vnc_update_client(void *opaque)

{

    VncState *vs = opaque;

    if (vs->need_update && vs->csock != -1) {

        int y;

        char *row;

        char *old_row;

        uint32_t width_mask[VNC_DIRTY_WORDS];

        int n_rectangles;

        int saved_offset;

        int has_dirty = 0;

        vnc_set_bits(width_mask, (vs->width / 16), VNC_DIRTY_WORDS);

        /* Walk through the dirty map and eliminate tiles that

           really aren't dirty */

        row = vs->ds->data;

        old_row = vs->old_data;

        for (y = 0; y < vs->height; y++) {

            if (vnc_and_bits(vs->dirty_row[y], width_mask, VNC_DIRTY_WORDS)) {

                int x;

                char *ptr, *old_ptr;

                ptr = row;

                old_ptr = old_row;

                for (x = 0; x < vs->ds->width; x += 16) {

                    if (memcmp(old_ptr, ptr, 16 * vs->depth) == 0) {

                        vnc_clear_bit(vs->dirty_row[y], (x / 16));

                    } else {

                        has_dirty = 1;

                        memcpy(old_ptr, ptr, 16 * vs->depth);

                    }

                    ptr += 16 * vs->depth;

                    old_ptr += 16 * vs->depth;

                }

            }

            row += vs->ds->linesize;

            old_row += vs->ds->linesize;

        }

        if (!has_dirty) {

            qemu_mod_timer(vs->timer, qemu_get_clock(rt_clock) + VNC_REFRESH_INTERVAL);

            return;

        }

        /* Count rectangles */

        n_rectangles = 0;

        vnc_write_u8(vs, 0);  /* msg id */

        vnc_write_u8(vs, 0);

        saved_offset = vs->output.offset;

        vnc_write_u16(vs, 0);

        for (y = 0; y < vs->height; y++) {

            int x;

            int last_x = -1;

            for (x = 0; x < vs->width / 16; x++) {

                if (vnc_get_bit(vs->dirty_row[y], x)) {

                    if (last_x == -1) {

                        last_x = x;

                    }

                    vnc_clear_bit(vs->dirty_row[y], x);

                } else {

                    if (last_x != -1) {

                        int h = find_dirty_height(vs, y, last_x, x);

                        send_framebuffer_update(vs, last_x * 16, y, (x - last_x) * 16, h);

                        n_rectangles++;

                    }

                    last_x = -1;

                }

            }

            if (last_x != -1) {

                int h = find_dirty_height(vs, y, last_x, x);

                send_framebuffer_update(vs, last_x * 16, y, (x - last_x) * 16, h);

                n_rectangles++;

            }

        }

        vs->output.buffer[saved_offset] = (n_rectangles >> 8) & 0xFF;

        vs->output.buffer[saved_offset + 1] = n_rectangles & 0xFF;

        vnc_flush(vs);

    }

    qemu_mod_timer(vs->timer, qemu_get_clock(rt_clock) + VNC_REFRESH_INTERVAL);

}

static void vnc_timer_init(VncState *vs)

{

    if (vs->timer == NULL) {

        vs->timer = qemu_new_timer(rt_clock, vnc_update_client, vs);

        qemu_mod_timer(vs->timer, qemu_get_clock(rt_clock));

    }

}

static void vnc_dpy_refresh(DisplayState *ds)

{

    VncState *vs = ds->opaque;

    vnc_timer_init(vs);

    vga_hw_update();

}

static int vnc_listen_poll(void *opaque)

{

    VncState *vs = opaque;

    if (vs->csock == -1)

        return 1;

    return 0;

}

static void buffer_reserve(Buffer *buffer, size_t len)

{

    if ((buffer->capacity - buffer->offset) < len) {

        buffer->capacity += (len + 1024);

        buffer->buffer = realloc(buffer->buffer, buffer->capacity);

        if (buffer->buffer == NULL) {

            fprintf(stderr, "vnc: out of memory\n");

            exit(1);

        }

    }

}

static int buffer_empty(Buffer *buffer)

{

    return buffer->offset == 0;

}

static char *buffer_end(Buffer *buffer)

{

    return buffer->buffer + buffer->offset;

}

static void buffer_reset(Buffer *buffer)

{

        buffer->offset = 0;

}

static void buffer_append(Buffer *buffer, const void *data, size_t len)

{

    memcpy(buffer->buffer + buffer->offset, data, len);

    buffer->offset += len;

}

static int vnc_client_io_error(VncState *vs, int ret, int last_errno)

{

    if (ret == 0 || ret == -1) {

        if (ret == -1 && (last_errno == EINTR || last_errno == EAGAIN))

            return 0;

        qemu_set_fd_handler2(vs->csock, NULL, NULL, NULL, NULL);

        closesocket(vs->csock);

        vs->csock = -1;

        buffer_reset(&vs->input);

        buffer_reset(&vs->output);

        vs->need_update = 0;

        return 0;

    }

    return ret;

}

static void vnc_client_error(VncState *vs)

{

    vnc_client_io_error(vs, -1, EINVAL);

}

static void vnc_client_write(void *opaque)

{

    long ret;

    VncState *vs = opaque;

    ret = send(vs->csock, vs->output.buffer, vs->output.offset, 0);

    ret = vnc_client_io_error(vs, ret, socket_error());

    if (!ret)

        return;

    memmove(vs->output.buffer, vs->output.buffer + ret, (vs->output.offset - ret));

    vs->output.offset -= ret;

    if (vs->output.offset == 0) {

        qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, NULL, vs);

    }

}

static void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting)

{

    vs->read_handler = func;

    vs->read_handler_expect = expecting;

}

static void vnc_client_read(void *opaque)

{

    VncState *vs = opaque;

    long ret;

    buffer_reserve(&vs->input, 4096);

    ret = recv(vs->csock, buffer_end(&vs->input), 4096, 0);

    ret = vnc_client_io_error(vs, ret, socket_error());

    if (!ret)

        return;

    vs->input.offset += ret;

    while (vs->read_handler && vs->input.offset >= vs->read_handler_expect) {

        size_t len = vs->read_handler_expect;

        int ret;

        ret = vs->read_handler(vs, vs->input.buffer, len);

        if (vs->csock == -1)

            return;

        if (!ret) {

            memmove(vs->input.buffer, vs->input.buffer + len, (vs->input.offset - len));

            vs->input.offset -= len;

        } else {

            vs->read_handler_expect = ret;

        }

    }

}

static void vnc_write(VncState *vs, const void *data, size_t len)

{

    buffer_reserve(&vs->output, len);

    if (buffer_empty(&vs->output)) {

        qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, vnc_client_write, vs);

    }

    buffer_append(&vs->output, data, len);

}

static void vnc_write_s32(VncState *vs, int32_t value)

{

    vnc_write_u32(vs, *(uint32_t *)&value);

}

static void vnc_write_u32(VncState *vs, uint32_t value)

{

    uint8_t buf[4];

    buf[0] = (value >> 24) & 0xFF;

    buf[1] = (value >> 16) & 0xFF;

    buf[2] = (value >>  8) & 0xFF;

    buf[3] = value & 0xFF;

    vnc_write(vs, buf, 4);

}

static void vnc_write_u16(VncState *vs, uint16_t value)

{

    uint8_t buf[2];

    buf[0] = (value >> 8) & 0xFF;

    buf[1] = value & 0xFF;

    vnc_write(vs, buf, 2);

}

static void vnc_write_u8(VncState *vs, uint8_t value)

{

    vnc_write(vs, (char *)&value, 1);

}

static void vnc_flush(VncState *vs)

{

    if (vs->output.offset)

        vnc_client_write(vs);

}

static uint8_t read_u8(uint8_t *data, size_t offset)

{

    return data[offset];

}

static uint16_t read_u16(uint8_t *data, size_t offset)

{

    return ((data[offset] & 0xFF) << 8) | (data[offset + 1] & 0xFF);

}

static int32_t read_s32(uint8_t *data, size_t offset)

{

    return (int32_t)((data[offset] << 24) | (data[offset + 1] << 16) |

                     (data[offset + 2] << 8) | data[offset + 3]);

}

static uint32_t read_u32(uint8_t *data, size_t offset)

{

    return ((data[offset] << 24) | (data[offset + 1] << 16) |

            (data[offset + 2] << 8) | data[offset + 3]);

}

static void client_cut_text(VncState *vs, size_t len, char *text)

{

}

static void pointer_event(VncState *vs, int button_mask, int x, int y)

{

    int buttons = 0;

    int dz = 0;

    if (button_mask & 0x01)

        buttons |= MOUSE_EVENT_LBUTTON;

    if (button_mask & 0x02)

        buttons |= MOUSE_EVENT_MBUTTON;

    if (button_mask & 0x04)

        buttons |= MOUSE_EVENT_RBUTTON;

    if (button_mask & 0x08)

        dz = -1;

    if (button_mask & 0x10)

        dz = 1;

    if (kbd_mouse_is_absolute()) {

        kbd_mouse_event(x * 0x7FFF / vs->ds->width,

                        y * 0x7FFF / vs->ds->height,

                        dz, buttons);

    } else {

        static int last_x = -1;

        static int last_y = -1;

        if (last_x != -1)

            kbd_mouse_event(x - last_x, y - last_y, dz, buttons);

        last_x = x;

        last_y = y;

    }

}

static void reset_keys(VncState *vs)

{

    int i;

    for(i = 0; i < 256; i++) {

        if (vs->modifiers_state[i]) {

            if (i & 0x80)

                kbd_put_keycode(0xe0);

            kbd_put_keycode(i | 0x80);

            vs->modifiers_state[i] = 0;

        }

    }

}

static void do_key_event(VncState *vs, int down, uint32_t sym)

{

    int keycode;

    keycode = keysym2scancode(vs->kbd_layout, sym & 0xFFFF);

    /* QEMU console switch */

    switch(keycode) {

    case 0x2a:                          /* Left Shift */

    case 0x36:                          /* Right Shift */

    case 0x1d:                          /* Left CTRL */

    case 0x9d:                          /* Right CTRL */

    case 0x38:                          /* Left ALT */

    case 0xb8:                          /* Right ALT */

        if (down)

            vs->modifiers_state[keycode] = 1;

        else

            vs->modifiers_state[keycode] = 0;

        break;

    case 0x02 ... 0x0a: /* '1' to '9' keys */ 

        if (down && vs->modifiers_state[0x1d] && vs->modifiers_state[0x38]) {

            /* Reset the modifiers sent to the current console */

            reset_keys(vs);

            console_select(keycode - 0x02);

            return;

        }

        break;

    }

    if (is_graphic_console()) {

        if (keycode & 0x80)

            kbd_put_keycode(0xe0);

        if (down)

            kbd_put_keycode(keycode & 0x7f);

        else

            kbd_put_keycode(keycode | 0x80);

    } else {

        /* QEMU console emulation */

        if (down) {

            switch (keycode) {

            case 0x2a:                          /* Left Shift */

            case 0x36:                          /* Right Shift */

            case 0x1d:                          /* Left CTRL */

            case 0x9d:                          /* Right CTRL */

            case 0x38:                          /* Left ALT */

            case 0xb8:                          /* Right ALT */

                break;

            case 0xc8:

                kbd_put_keysym(QEMU_KEY_UP);

                break;

            case 0xd0:

                kbd_put_keysym(QEMU_KEY_DOWN);

                break;

            case 0xcb:

                kbd_put_keysym(QEMU_KEY_LEFT);

                break;

            case 0xcd:

                kbd_put_keysym(QEMU_KEY_RIGHT);

                break;

            case 0xd3:

                kbd_put_keysym(QEMU_KEY_DELETE);

                break;

            case 0xc7:

                kbd_put_keysym(QEMU_KEY_HOME);

                break;

            case 0xcf:

                kbd_put_keysym(QEMU_KEY_END);

                break;

            case 0xc9:

                kbd_put_keysym(QEMU_KEY_PAGEUP);

                break;

            case 0xd1:

                kbd_put_keysym(QEMU_KEY_PAGEDOWN);

                break;

            default:

                kbd_put_keysym(sym);

                break;

            }

        }

    }

}

static void key_event(VncState *vs, int down, uint32_t sym)

{

    if (sym >= 'A' && sym <= 'Z')

        sym = sym - 'A' + 'a';

    do_key_event(vs, down, sym);

}

static void framebuffer_update_request(VncState *vs, int incremental,

                                       int x_position, int y_position,

                                       int w, int h)

{

    int i;

    vs->need_update = 1;

    if (!incremental) {

        char *old_row = vs->old_data + y_position * vs->ds->linesize;

        for (i = 0; i < h; i++) {

            vnc_set_bits(vs->dirty_row[y_position + i], 

                         (vs->ds->width / 16), VNC_DIRTY_WORDS);

            memset(old_row, 42, vs->ds->width * vs->depth);

            old_row += vs->ds->linesize;

        }

    }

}

static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)

{

    int i;

    vs->has_hextile = 0;

    vs->has_resize = 0;

    vs->ds->dpy_copy = NULL;

    for (i = n_encodings - 1; i >= 0; i--) {

        switch (encodings[i]) {

        case 0: /* Raw */

            vs->has_hextile = 0;

            break;

        case 1: /* CopyRect */

            vs->ds->dpy_copy = vnc_copy;

            break;

        case 5: /* Hextile */

            vs->has_hextile = 1;

            break;

        case -223: /* DesktopResize */

            vs->has_resize = 1;

            break;

        default:

            break;

        }

    }

}

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,

                             int red_max, int green_max, int blue_max,

                             int red_shift, int green_shift, int blue_shift)

{

    int host_big_endian_flag;

#ifdef WORDS_BIGENDIAN

    host_big_endian_flag = 1;

#else

    host_big_endian_flag = 0;

#endif

    if (!true_color_flag) {

    fail:

        vnc_client_error(vs);

        return;

    }

    if (bits_per_pixel == 32 && 

        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;