/**************************************************************************** * graphics/vnc/vnc_raw.c * * Copyright (C) 2016 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #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 uint16_t *dest; nxgl_coord_t x; nxgl_coord_t y; /* Destination rectangle start address */ update = (FAR struct rfb_framebufferupdate_s *)session->outbuf; dest = (FAR uint16_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_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 uint32_t *dest; nxgl_coord_t x; nxgl_coord_t y; /* Destination rectangle start address */ update = (FAR struct rfb_framebufferupdate_s *)session->outbuf; dest = (FAR uint32_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)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: gdbg("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(); gdbg("ERROR: Send FrameBufferUpdate failed: %d\n", errcode); DEBUGASSERT(errcode > 0); return -errcode; } DEBUGASSERT(nsent <= size); src += nsent; size -= nsent; } while (size > 0); } } } return OK; }