From 0c426e4534b4945f7377380b7bb4e64b098bb638 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Tue, 24 May 2016 17:19:19 +0300 Subject: [PATCH] vnc: Add support for color map Our current VNC code does not handle color maps (aka non-true-color) at all and aborts if a client requests them. There are 2 major issues with this: 1) A VNC viewer on an 8-bit X11 system may request color maps 2) RealVNC _always_ starts requesting color maps, then moves on to full color In order to support these 2 use cases, let's just create a fake color map that covers exactly our normal true color 8 bit color space. That way we don't lose anything over a client that wants true color. Reported-by: Sascha Wehnert Signed-off-by: Alexander Graf Signed-off-by: Pavel Butsykin Signed-off-by: Denis V. Lunev Message-id: 1464099559-20789-1-git-send-email-den@openvz.org Actually this is a very old patch originally submitted in 2013 by Alexander. The situation is still the same with RealVNC, it does not connect by default to QEMU VNC. The problem is that this client is really popular. This is better to be kludged. Signed-off-by: Pavel Butsykin Signed-off-by: Denis V. Lunev CC: Gerd Hoffmann CC: Paolo Bonzini Signed-off-by: Gerd Hoffmann --- ui/vnc.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/ui/vnc.c b/ui/vnc.c index d2ebf1fb71..ddd01fdce6 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -2094,6 +2094,24 @@ static void set_pixel_conversion(VncState *vs) } } +static void send_color_map(VncState *vs) +{ + int i; + + vnc_write_u8(vs, VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES); + vnc_write_u8(vs, 0); /* padding */ + vnc_write_u16(vs, 0); /* first color */ + vnc_write_u16(vs, 256); /* # of colors */ + + for (i = 0; i < 256; i++) { + PixelFormat *pf = &vs->client_pf; + + vnc_write_u16(vs, (((i >> pf->rshift) & pf->rmax) << (16 - pf->rbits))); + vnc_write_u16(vs, (((i >> pf->gshift) & pf->gmax) << (16 - pf->gbits))); + vnc_write_u16(vs, (((i >> pf->bshift) & pf->bmax) << (16 - pf->bbits))); + } +} + static void set_pixel_format(VncState *vs, int bits_per_pixel, int depth, int big_endian_flag, int true_color_flag, @@ -2101,8 +2119,15 @@ static void set_pixel_format(VncState *vs, int red_shift, int green_shift, int blue_shift) { if (!true_color_flag) { - vnc_client_error(vs); - return; + /* Expose a reasonable default 256 color map */ + bits_per_pixel = 8; + depth = 8; + red_max = 7; + green_max = 7; + blue_max = 3; + red_shift = 0; + green_shift = 3; + blue_shift = 6; } switch (bits_per_pixel) { @@ -2132,6 +2157,10 @@ static void set_pixel_format(VncState *vs, vs->client_pf.depth = bits_per_pixel == 32 ? 24 : bits_per_pixel; vs->client_be = big_endian_flag; + if (!true_color_flag) { + send_color_map(vs); + } + set_pixel_conversion(vs); graphic_hw_invalidate(vs->vd->dcl.con); -- 2.11.4.GIT