[Qemu-devel] qemu vnc.c

[Fabrice Bellard]

CVSROOT:        /sources/qemu
Module name:    qemu
Changes by:     Fabrice Bellard <bellard>       06/06/13 16:35:24

Modified files:
        .              : vnc.c 

Log message:
        support for higher resolutions

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/qemu/vnc.c?cvsroot=qemu&r1=1.6&r2=1.7

Patches:
Index: vnc.c
===================================================================
RCS file: /sources/qemu/qemu/vnc.c,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -b -r1.6 -r1.7
--- vnc.c       14 May 2006 18:11:49 -0000      1.6
+++ vnc.c       13 Jun 2006 16:35:24 -0000      1.7
@@ -50,6 +50,10 @@
                                 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;
@@ -59,7 +63,7 @@
     int need_update;
     int width;
     int height;
-    uint64_t dirty_row[768];
+    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;
@@ -95,6 +99,47 @@
 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;
@@ -104,7 +149,7 @@
 
     for (; y < h; y++)
        for (i = 0; i < w; i += 16)
-           vs->dirty_row[y] |= (1ULL << ((x + 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,
@@ -316,10 +361,10 @@
 
     for (h = 1; h < (vs->height - y); h++) {
        int tmp_x;
-       if (!(vs->dirty_row[y + h] & (1ULL << last_x)))
+       if (!vnc_get_bit(vs->dirty_row[y + h], last_x))
            break;
        for (tmp_x = last_x; tmp_x < x; tmp_x++)
-           vs->dirty_row[y + h] &= ~(1ULL << tmp_x);
+           vnc_clear_bit(vs->dirty_row[y + h], tmp_x);
     }
 
     return h;
@@ -333,15 +378,12 @@
        int y;
        char *row;
        char *old_row;
-       uint64_t width_mask;
+       uint32_t width_mask[VNC_DIRTY_WORDS];
        int n_rectangles;
        int saved_offset;
        int has_dirty = 0;
 
-       width_mask = (1ULL << (vs->width / 16)) - 1;
-
-       if (vs->width == 1024)
-           width_mask = ~(0ULL);
+        vnc_set_bits(width_mask, (vs->width / 16), VNC_DIRTY_WORDS);
 
        /* Walk through the dirty map and eliminate tiles that
           really aren't dirty */
@@ -349,7 +391,7 @@
        old_row = vs->old_data;
 
        for (y = 0; y < vs->height; y++) {
-           if (vs->dirty_row[y] & width_mask) {
+           if (vnc_and_bits(vs->dirty_row[y], width_mask, VNC_DIRTY_WORDS)) {
                int x;
                char *ptr, *old_ptr;
 
@@ -358,7 +400,7 @@
 
                for (x = 0; x < vs->ds->width; x += 16) {
                    if (memcmp(old_ptr, ptr, 16 * vs->depth) == 0) {
-                       vs->dirty_row[y] &= ~(1ULL << (x / 16));
+                       vnc_clear_bit(vs->dirty_row[y], (x / 16));
                    } else {
                        has_dirty = 1;
                        memcpy(old_ptr, ptr, 16 * vs->depth);
@@ -389,11 +431,11 @@
            int x;
            int last_x = -1;
            for (x = 0; x < vs->width / 16; x++) {
-               if (vs->dirty_row[y] & (1ULL << x)) {
+               if (vnc_get_bit(vs->dirty_row[y], x)) {
                    if (last_x == -1) {
                        last_x = x;
                    }
-                   vs->dirty_row[y] &= ~(1ULL << x);
+                   vnc_clear_bit(vs->dirty_row[y], x);
                } else {
                    if (last_x != -1) {
                        int h = find_dirty_height(vs, y, last_x, x);
@@ -688,10 +730,8 @@
        char *old_row = vs->old_data + y_position * vs->ds->linesize;
 
        for (i = 0; i < h; i++) {
-           vs->dirty_row[y_position + i] = (1ULL << (vs->ds->width / 16)) - 1;
-           if (vs->ds->width == 1024) {
-             vs->dirty_row[y_position + i] = ~(0ULL);
-           }
+            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;
        }