VNC server (Anthony Liguori)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1869 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 189 insertions, 0 deletions

diff --git a/vnchextile.h b/vnchextile.h
new file mode 100644
index 000000000..7277670a5
--- /dev/null
+++ b/vnchextile.h
@@ -0,0 +1,189 @@
+#define CONCAT_I(a, b) a ## b
+#define CONCAT(a, b) CONCAT_I(a, b)
+#define pixel_t CONCAT(uint, CONCAT(BPP, _t))
+
+static void CONCAT(send_hextile_tile_, BPP)(VncState *vs,
+					    int x, int y, int w, int h,
+					    pixel_t *last_bg, pixel_t *last_fg,
+					    int *has_bg, int *has_fg)
+{
+    char *row = (vs->ds->data + y * vs->ds->linesize + x * vs->depth);
+    pixel_t *irow = (pixel_t *)row;
+    int j, i;
+    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];
+    int n_data = 0;
+    int n_subtiles = 0;
+
+    for (j = 0; j < h; j++) {
+	for (i = 0; i < w; i++) {
+	    switch (n_colors) {
+	    case 0:
+		bg = irow[i];
+		n_colors = 1;
+		break;
+	    case 1:
+		if (irow[i] != bg) {
+		    fg = irow[i];
+		    n_colors = 2;
+		}
+		break;
+	    case 2:
+		if (irow[i] != bg && irow[i] != fg) {
+		    n_colors = 3;
+		} else {
+		    if (irow[i] == bg)
+			bg_count++;
+		    else if (irow[i] == fg)
+			fg_count++;
+		}
+		break;
+	    default:
+		break;
+	    }
+	}
+	if (n_colors > 2)
+	    break;
+	irow += vs->ds->linesize / sizeof(pixel_t);
+    }
+
+    if (n_colors > 1 && fg_count > bg_count) {
+	pixel_t tmp = fg;
+	fg = bg;
+	bg = tmp;
+    }
+
+    if (!*has_bg || *last_bg != bg) {
+	flags |= 0x02;
+	*has_bg = 1;
+	*last_bg = bg;
+    }
+
+    if (!*has_fg || *last_fg != fg) {
+	flags |= 0x04;
+	*has_fg = 1;
+	*last_fg = fg;
+    }
+
+    switch (n_colors) {
+    case 1:
+	n_data = 0;
+	break;
+    case 2:
+	flags |= 0x08;
+
+	irow = (pixel_t *)row;
+	
+	for (j = 0; j < h; j++) {
+	    int min_x = -1;
+	    for (i = 0; i < w; i++) {
+		if (irow[i] == fg) {
+		    if (min_x == -1)
+			min_x = i;
+		} else if (min_x != -1) {
+		    hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
+		    n_data += 2;
+		    n_subtiles++;
+		    min_x = -1;
+		}
+	    }
+	    if (min_x != -1) {
+		hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
+		n_data += 2;
+		n_subtiles++;
+	    }
+	    irow += vs->ds->linesize / sizeof(pixel_t);
+	}
+	break;
+    case 3:
+	flags |= 0x18;
+
+	irow = (pixel_t *)row;
+
+	if (!*has_bg || *last_bg != bg)
+	    flags |= 0x02;
+
+	for (j = 0; j < h; j++) {
+	    int has_color = 0;
+	    int min_x = -1;
+	    pixel_t color;
+
+	    for (i = 0; i < w; i++) {
+		if (!has_color) {
+		    if (irow[i] == bg)
+			continue;
+		    color = irow[i];
+		    min_x = i;
+		    has_color = 1;
+		} else if (irow[i] != color) {
+		    has_color = 0;
+
+		    memcpy(data + n_data, &color, sizeof(color));
+		    hextile_enc_cord(data + n_data + sizeof(pixel_t), min_x, j, i - min_x, 1);
+		    n_data += 2 + sizeof(pixel_t);
+		    n_subtiles++;
+
+		    min_x = -1;
+		    if (irow[i] != bg) {
+			color = irow[i];
+			min_x = i;
+			has_color = 1;
+		    }
+		}
+	    }
+	    if (has_color) {
+		memcpy(data + n_data, &color, sizeof(color));
+		hextile_enc_cord(data + n_data + sizeof(pixel_t), min_x, j, i - min_x, 1);
+		n_data += 2 + sizeof(pixel_t);
+		n_subtiles++;
+	    }
+	    irow += vs->ds->linesize / sizeof(pixel_t);
+	}
+
+	/* A SubrectsColoured subtile invalidates the foreground color */
+	*has_fg = 0;
+	if (n_data > (w * h * sizeof(pixel_t))) {
+	    n_colors = 4;
+	    flags = 0x01;
+	    *has_bg = 0;
+
+	    /* we really don't have to invalidate either the bg or fg
+	       but we've lost the old values.  oh well. */
+	}
+    default:
+	break;
+    }
+
+    if (n_colors > 3) {
+	flags = 0x01;
+	*has_fg = 0;
+	*has_bg = 0;
+	n_colors = 4;
+    }
+
+    vnc_write_u8(vs, flags);
+    if (n_colors < 4) {
+	if (flags & 0x02)
+	    vnc_write(vs, last_bg, sizeof(pixel_t));
+	if (flags & 0x04)
+	    vnc_write(vs, last_fg, sizeof(pixel_t));
+	if (n_subtiles) {
+	    vnc_write_u8(vs, n_subtiles);
+	    vnc_write(vs, data, n_data);
+	}
+    } else {
+	for (j = 0; j < h; j++) {
+	    vnc_write(vs, row, w * vs->depth);
+	    row += vs->ds->linesize;
+	}
+    }
+}
+
+#undef pixel_t
+#undef CONCAT_I
+#undef CONCAT