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nuttx/graphics/vnc/server/vnc_raw.c

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/****************************************************************************
* graphics/vnc/vnc_raw.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <assert.h>
#include <errno.h>
#if defined(CONFIG_VNCSERVER_DEBUG) && !defined(CONFIG_DEBUG_GRAPHICS)
# undef CONFIG_DEBUG_FEATURES
# undef CONFIG_DEBUG_ERROR
# undef CONFIG_DEBUG_WARN
# undef CONFIG_DEBUG_INFO
# define CONFIG_DEBUG_FEATURES 1
# define CONFIG_DEBUG_ERROR 1
# define CONFIG_DEBUG_WARN 1
# define CONFIG_DEBUG_INFO 1
# define CONFIG_DEBUG_GRAPHICS 1
#endif
#include <debug.h>
#include "vnc_server.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: vnc_copy8
*
* Description:
* Copy a 16/32-bit pixels from the source rectangle to a 8-bit pixel
* destination rectangle.
*
* Input Parameters:
* session - A reference to the VNC session structure.
* row,col - The upper left X/Y (pixel/row) position of the rectangle
* width,height - The width (pixels) and height (rows of the rectangle)
* convert - The function to use to convert from the local framebuffer
* color format to the remote framebuffer color format.
*
* Returned Value:
* The size of the transfer in bytes.
*
****************************************************************************/
static size_t vnc_copy8(FAR struct vnc_session_s *session,
nxgl_coord_t row, nxgl_coord_t col,
nxgl_coord_t height, nxgl_coord_t width,
vnc_convert8_t convert)
{
FAR struct rfb_framebufferupdate_s *update;
FAR const lfb_color_t *srcleft;
FAR const lfb_color_t *src;
FAR uint8_t *dest;
nxgl_coord_t x;
nxgl_coord_t y;
/* Destination rectangle start address */
update = (FAR struct rfb_framebufferupdate_s *)session->outbuf;
dest = (FAR uint8_t *)update->rect[0].data;
/* Source rectangle start address (left/top)*/
srcleft = (FAR lfb_color_t *)
(session->fb + RFB_STRIDE * row + RFB_BYTESPERPIXEL * col);
/* Transfer each row from the source buffer into the update buffer */
for (y = 0; y < height; y++)
{
src = srcleft;
for (x = 0; x < width; x++)
{
*dest++ = convert(*src);
src++;
}
srcleft = (FAR lfb_color_t *)((uintptr_t)srcleft + RFB_STRIDE);
}
return (size_t)((uintptr_t)dest - (uintptr_t)update->rect[0].data);
}
/****************************************************************************
* Name: vnc_copy16
*
* Description:
* Copy a 16/32-bit pixels from the source rectangle to a 16-bit pixel
* destination rectangle.
*
* Input Parameters:
* session - A reference to the VNC session structure.
* row,col - The upper left X/Y (pixel/row) position of the rectangle
* width,height - The width (pixels) and height (rows of the rectangle)
* convert - The function to use to convert from the local framebuffer
* color format to the remote framebuffer color format.
*
* Returned Value:
* The size of the transfer in bytes.
*
****************************************************************************/
static size_t vnc_copy16(FAR struct vnc_session_s *session,
nxgl_coord_t row, nxgl_coord_t col,
nxgl_coord_t height, nxgl_coord_t width,
vnc_convert16_t convert)
{
FAR struct rfb_framebufferupdate_s *update;
FAR const lfb_color_t *srcleft;
FAR const lfb_color_t *src;
FAR uint8_t *dest;
uint16_t pixel;
nxgl_coord_t x;
nxgl_coord_t y;
bool bigendian;
/* Destination rectangle start address */
update = (FAR struct rfb_framebufferupdate_s *)session->outbuf;
dest = (FAR uint8_t *)update->rect[0].data;
/* Source rectangle start address (left/top)*/
srcleft = (FAR lfb_color_t *)(session->fb + RFB_STRIDE * row + RFB_BYTESPERPIXEL * col);
/* Transfer each row from the source buffer into the update buffer */
bigendian = session->bigendian;
for (y = 0; y < height; y++)
{
src = srcleft;
for (x = 0; x < width; x++)
{
pixel = convert(*src);
if (bigendian)
{
rfb_putbe16(dest, pixel);
}
else
{
rfb_putle16(dest, pixel);
}
dest += sizeof(uint16_t);
src++;
}
srcleft = (FAR lfb_color_t *)((uintptr_t)srcleft + RFB_STRIDE);
}
return (size_t)((uintptr_t)dest - (uintptr_t)update->rect[0].data);
}
/****************************************************************************
* Name: vnc_copy32
*
* Description:
* Copy a 16/32-bit pixels from the source rectangle to a 32-bit pixel
* destination rectangle.
*
* Input Parameters:
* session - A reference to the VNC session structure.
* row,col - The upper left X/Y (pixel/row) position of the rectangle
* width,height - The width (pixels) and height (rows of the rectangle)
* convert - The function to use to convert from the local framebuffer
* color format to the remote framebuffer color format.
*
* Returned Value:
* The size of the transfer in bytes.
*
****************************************************************************/
static size_t vnc_copy32(FAR struct vnc_session_s *session,
nxgl_coord_t row, nxgl_coord_t col,
nxgl_coord_t height, nxgl_coord_t width,
vnc_convert32_t convert)
{
FAR struct rfb_framebufferupdate_s *update;
FAR const lfb_color_t *srcleft;
FAR const lfb_color_t *src;
FAR uint8_t *dest;
nxgl_coord_t x;
nxgl_coord_t y;
uint32_t pixel;
bool bigendian;
/* Destination rectangle start address */
update = (FAR struct rfb_framebufferupdate_s *)session->outbuf;
dest = (FAR uint8_t *)update->rect[0].data;
/* Source rectangle start address (left/top)*/
srcleft = (FAR lfb_color_t *)(session->fb + RFB_STRIDE * row + RFB_BYTESPERPIXEL * col);
/* Transfer each row from the source buffer into the update buffer */
bigendian = session->bigendian;
for (y = 0; y < height; y++)
{
src = srcleft;
for (x = 0; x < width; x++)
{
pixel = convert(*src);
if (bigendian)
{
rfb_putbe32(dest, pixel);
}
else
{
rfb_putle32(dest, pixel);
}
dest += sizeof(uint32_t);
src++;
}
srcleft = (FAR lfb_color_t *)((uintptr_t)srcleft + RFB_STRIDE);
}
return (size_t)((uintptr_t)srcleft - (uintptr_t)update->rect[0].data);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: vnc_raw
*
* Description:
* As a fallback, send the framebuffer update using the RAW encoding which
* must be supported by all VNC clients.
*
* Input Parameters:
* session - An instance of the session structure.
* rect - Describes the rectangle in the local framebuffer.
*
* Returned Value:
* Zero (OK) on success; A negated errno value is returned on failure that
* indicates the the nature of the failure. A failure is only returned
* in cases of a network failure and unexpected internal failures.
*
****************************************************************************/
int vnc_raw(FAR struct vnc_session_s *session, FAR struct nxgl_rect_s *rect)
{
FAR struct rfb_framebufferupdate_s *update;
FAR const uint8_t *src;
nxgl_coord_t srcwidth;
nxgl_coord_t srcheight;
nxgl_coord_t destwidth;
nxgl_coord_t destheight;
nxgl_coord_t deststride;
nxgl_coord_t updwidth;
nxgl_coord_t updheight;
nxgl_coord_t width;
nxgl_coord_t x;
nxgl_coord_t y;
unsigned int bytesperpixel;
unsigned int maxwidth;
size_t size;
ssize_t nsent;
uint8_t colorfmt;
union
{
vnc_convert8_t bpp8;
vnc_convert16_t bpp16;
vnc_convert32_t bpp32;
} convert;
/* Set up characteristics of the client pixel format to use on this
* update. These can change at any time if a SetPixelFormat is
* received asynchronously.
*/
bytesperpixel = (session->bpp + 7) >> 3;
maxwidth = CONFIG_VNCSERVER_UPDATE_BUFSIZE / bytesperpixel;
/* Set up the color conversion */
colorfmt = session->colorfmt;
switch (colorfmt)
{
case FB_FMT_RGB8_222:
convert.bpp8 = vnc_convert_rgb8_222;
break;
case FB_FMT_RGB8_332:
convert.bpp8 = vnc_convert_rgb8_332;
break;
case FB_FMT_RGB16_555:
convert.bpp16 = vnc_convert_rgb16_555;
break;
case FB_FMT_RGB16_565:
convert.bpp16 = vnc_convert_rgb16_565;
break;
case FB_FMT_RGB32:
convert.bpp32 = vnc_convert_rgb32_888;
break;
default:
gerr("ERROR: Unrecognized color format: %d\n", session->colorfmt);
return -EINVAL;
}
/* Get with width and height of the source and destination rectangles.
* The source rectangle many be larger than the destination rectangle.
* In that case, we will have to emit multiple rectangles.
*/
DEBUGASSERT(rect->pt1.x <= rect->pt2.x);
srcwidth = rect->pt2.x - rect->pt1.x + 1;
DEBUGASSERT(rect->pt1.y <= rect->pt2.y);
srcheight = rect->pt2.y - rect->pt1.y + 1;
deststride = srcwidth * bytesperpixel;
if (deststride > maxwidth)
{
deststride = maxwidth;
}
destwidth = deststride / bytesperpixel;
destheight = CONFIG_VNCSERVER_UPDATE_BUFSIZE / deststride;
if (destheight > srcheight)
{
destheight = srcheight;
}
/* Format the rectangle header. We may have to send several update
* messages if the pre-allocated outbuf is smaller than the rectangle.
* Each update contains a small "sub-rectangle" of the origin update.
*
* Loop until all sub-rectangles have been output. Start with the
* top row and transfer rectangles horizontally across each swath.
* The height of the swath is destwidth (the last may be shorter).
*
* NOTE that the loop also terminates of the color format changes
* asynchronously.
*/
for (y = rect->pt1.y;
srcheight > 0 && colorfmt == session->colorfmt;
srcheight -= updheight, y += updheight)
{
/* updheight = Height to update on this pass through the loop.
* This will be destheight unless fewer than that number of rows
* remain.
*/
updheight = destheight;
if (updheight > srcheight)
{
updheight = srcheight;
}
/* Loop until this horizontal swath has sent to the VNC client.
* Start with the leftmost pixel and transfer rectangles
* horizontally with width of destwidth until all srcwidth
* columns have been transferred (the last rectangle may be
* narrower).
*
* NOTE that the loop also terminates of the color format
* changes asynchronously.
*/
for (width = srcwidth, x = rect->pt1.x;
width > 0 && colorfmt == session->colorfmt;
width -= updwidth, x += updwidth)
{
/* updwidth = Width to update on this pass through the loop.
* This will be destwidth unless fewer than that number of
* columns remain.
*/
updwidth = destwidth;
if (updwidth > width)
{
updwidth = width;
}
/* Transfer the frame buffer data into the rectangle,
* performing the necessary color conversions.
*/
if (bytesperpixel == 1)
{
size = vnc_copy8(session, y, x, updheight, updwidth,
convert.bpp8);
}
else if (bytesperpixel == 2)
{
size = vnc_copy16(session, y, x, updheight, updwidth,
convert.bpp16);
}
else /* bytesperpixel == 4 */
{
size = vnc_copy32(session, y, x, updheight, updwidth,
convert.bpp32);
}
/* Format the FramebufferUpdate message */
update = (FAR struct rfb_framebufferupdate_s *)session->outbuf;
update->msgtype = RFB_FBUPDATE_MSG;
update->padding = 0;
rfb_putbe16(update->nrect, 1);
rfb_putbe16(update->rect[0].xpos, x);
rfb_putbe16(update->rect[0].ypos, y);
rfb_putbe16(update->rect[0].width, updwidth);
rfb_putbe16(update->rect[0].height, updheight);
rfb_putbe32(update->rect[0].encoding, RFB_ENCODING_RAW);
DEBUGASSERT(size <= CONFIG_VNCSERVER_UPDATE_BUFSIZE);
/* We are ready to send the update packet to the VNC client */
size += SIZEOF_RFB_FRAMEBUFFERUPDATE_S(SIZEOF_RFB_RECTANGE_S(0));
src = session->outbuf;
/* At the very last most, make certain that the color format
* has not changed asynchronously.
*/
if (colorfmt == session->colorfmt)
{
/* Okay send until all of the bytes are out. This may
* loop for the case where TCP write buffering is enabled
* and there are a limited number of IOBs available.
*/
do
{
nsent = psock_send(&session->connect, src, size, 0);
if (nsent < 0)
{
int errcode = get_errno();
gerr("ERROR: Send FrameBufferUpdate failed: %d\n",
errcode);
DEBUGASSERT(errcode > 0);
return -errcode;
}
DEBUGASSERT(nsent <= size);
src += nsent;
size -= nsent;
}
while (size > 0);
updinfo("Sent {(%d, %d),(%d, %d)}\n",
x, y, x + updwidth -1, y + updheight - 1);
}
}
}
return OK;
}
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