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[Qemu-devel] [5229] vnc dynamic resolution (Stefano Stabellini)


From: Anthony Liguori
Subject: [Qemu-devel] [5229] vnc dynamic resolution (Stefano Stabellini)
Date: Mon, 15 Sep 2008 16:03:42 +0000

Revision: 5229
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5229
Author:   aliguori
Date:     2008-09-15 16:03:41 +0000 (Mon, 15 Sep 2008)

Log Message:
-----------
vnc dynamic resolution (Stefano Stabellini)

Signed-off-by: Stefano Stabellini <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>

Modified Paths:
--------------
    trunk/vnc.c
    trunk/vnchextile.h

Modified: trunk/vnc.c
===================================================================
--- trunk/vnc.c 2008-09-15 16:01:01 UTC (rev 5228)
+++ trunk/vnc.c 2008-09-15 16:03:41 UTC (rev 5229)
@@ -71,8 +71,8 @@
 
 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);
 
 #define VNC_MAX_WIDTH 2048
@@ -164,9 +164,9 @@
     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 client_red_shift, client_red_max, server_red_shift, server_red_max;
+    int client_green_shift, client_green_max, server_green_shift, 
server_green_max;
+    int client_blue_shift, client_blue_max, server_blue_shift, server_blue_max;
 
     VncReadEvent *read_handler;
     size_t read_handler_expect;
@@ -208,6 +208,8 @@
 static void vnc_update_client(void *opaque);
 static void vnc_client_read(void *opaque);
 
+static void vnc_colordepth(DisplayState *ds, int depth);
+
 static inline void vnc_set_bit(uint32_t *d, int k)
 {
     d[k >> 5] |= 1 << (k & 0x1f);
@@ -330,14 +332,17 @@
 /* slowest but generic code. */
 static void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v)
 {
-    unsigned int r, g, b;
+    uint8_t 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);
+    r = ((v >> vs->server_red_shift) & vs->server_red_max) * 
(vs->client_red_max + 1) /
+        (vs->server_red_max + 1);
+    g = ((v >> vs->server_green_shift) & vs->server_green_max) * 
(vs->client_green_max + 1) /
+        (vs->server_green_max + 1);
+    b = ((v >> vs->server_blue_shift) & vs->server_blue_max) * 
(vs->client_blue_max + 1) /
+        (vs->server_blue_max + 1);
+    v = (r << vs->client_red_shift) |
+        (g << vs->client_green_shift) |
+        (b << vs->client_blue_shift);
     switch(vs->pix_bpp) {
     case 1:
         buf[0] = v;
@@ -370,14 +375,34 @@
 
 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");
     }
 }
 
@@ -414,6 +439,18 @@
 #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
 #include "vnchextile.h"
 #undef BPP
@@ -423,18 +460,23 @@
 {
     int i, j;
     int has_fg, has_bg;
-    uint32_t last_fg32, last_bg32;
+    uint8_t *last_fg, *last_bg;
 
     vnc_framebuffer_update(vs, x, y, w, h, 5);
 
+    last_fg = (uint8_t *) malloc(vs->depth);
+    last_bg = (uint8_t *) 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)
@@ -1133,17 +1175,6 @@
     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,
@@ -1163,6 +1194,7 @@
         return;
     }
     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) {
@@ -1171,6 +1203,7 @@
         vs->send_hextile_tile = send_hextile_tile_32;
     } else
     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) {
@@ -1179,6 +1212,7 @@
         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;
@@ -1191,28 +1225,116 @@
             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->client_red_shift = red_shift;
+    vs->client_red_max = red_max;
+    vs->client_green_shift = green_shift;
+    vs->client_green_max = green_max;
+    vs->client_blue_shift = blue_shift;
+    vs->client_blue_max = blue_max;
+    vs->pix_bpp = bits_per_pixel / 8;
 
     vga_hw_invalidate();
     vga_hw_update();
 }
 
+static void vnc_colordepth(DisplayState *ds, int depth)
+{
+    int host_big_endian_flag;
+    struct VncState *vs = ds->opaque;
+
+    switch (depth) {
+        case 24:
+            if (ds->depth == 32) return;
+            depth = 32;
+            break;
+        case 15:
+        case 8:
+        case 0:
+            return;
+        default:
+            break;
+    }
+
+#ifdef WORDS_BIGENDIAN
+    host_big_endian_flag = 1;
+#else
+    host_big_endian_flag = 0;
+#endif   
+    
+    switch (depth) {
+        case 8:
+            vs->depth = depth / 8;
+            vs->server_red_max = 7;
+            vs->server_green_max = 7;
+            vs->server_blue_max = 3;
+            vs->server_red_shift = 5;
+            vs->server_green_shift = 2;
+            vs->server_blue_shift = 0;
+            break;
+        case 16:
+            vs->depth = depth / 8;
+            vs->server_red_max = 31;
+            vs->server_green_max = 63;
+            vs->server_blue_max = 31;
+            vs->server_red_shift = 11;
+            vs->server_green_shift = 5;
+            vs->server_blue_shift = 0;
+            break;
+        case 32:
+            vs->depth = 4;
+            vs->server_red_max = 255;
+            vs->server_green_max = 255;
+            vs->server_blue_max = 255;
+            vs->server_red_shift = 16;
+            vs->server_green_shift = 8;
+            vs->server_blue_shift = 0;
+            break;
+        default:
+            return;
+    }
+
+    if (vs->pix_bpp == 4 && vs->depth == 4 &&
+            host_big_endian_flag == vs->pix_big_endian &&
+            vs->client_red_max == 0xff && vs->client_green_max == 0xff && 
vs->client_blue_max == 0xff &&
+            vs->client_red_shift == 16 && vs->client_green_shift == 8 && 
vs->client_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->client_red_max == 31 && vs->client_green_max == 63 && 
vs->client_blue_max == 31 &&
+            vs->client_red_shift == 11 && vs->client_green_shift == 5 && 
vs->client_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->client_red_max == 7 && vs->client_green_max == 7 && 
vs->client_blue_max == 3 &&
+            vs->client_red_shift == 5 && vs->client_green_shift == 2 && 
vs->client_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;
+    }
+}
+
 static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
 {
     int i;
@@ -1316,7 +1438,9 @@
     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
@@ -2006,7 +2130,6 @@
 
     vs->lsock = -1;
     vs->csock = -1;
-    vs->depth = 4;
     vs->last_x = -1;
     vs->last_y = -1;
 
@@ -2027,6 +2150,7 @@
     vs->ds->dpy_resize = vnc_dpy_resize;
     vs->ds->dpy_refresh = NULL;
 
+    vnc_colordepth(vs->ds, 32);
     vnc_dpy_resize(vs->ds, 640, 400);
 }
 

Modified: trunk/vnchextile.h
===================================================================
--- trunk/vnchextile.h  2008-09-15 16:01:01 UTC (rev 5228)
+++ trunk/vnchextile.h  2008-09-15 16:03:41 UTC (rev 5229)
@@ -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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