system/vncviewer: add VNC viewer for LCD display

system/vncviewer/CMakeLists.txt

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+# ##############################################################################
+# apps/system/vncviewer/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_SYSTEM_VNCVIEWER)
+  nuttx_add_application(
+    NAME
+    ${CONFIG_SYSTEM_VNCVIEWER_PROGNAME}
+    SRCS
+    vncviewer_main.c
+    rfb_protocol.c
+    lcd_render.c
+    STACKSIZE
+    ${CONFIG_SYSTEM_VNCVIEWER_STACKSIZE}
+    PRIORITY
+    ${CONFIG_SYSTEM_VNCVIEWER_PRIORITY})
+endif()

system/vncviewer/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config SYSTEM_VNCVIEWER
+	tristate "VNC Viewer"
+	default n
+	depends on NET_TCP && LCD
+	---help---
+		Enable the VNC Viewer example application.
+		Connects to a VNC server and displays the remote
+		framebuffer on a local LCD.
+
+if SYSTEM_VNCVIEWER
+
+config SYSTEM_VNCVIEWER_PROGNAME
+	string "Program name"
+	default "vncviewer"
+	---help---
+		This is the name of the program that will be used when the
+		NSH ELF program is installed.
+
+config SYSTEM_VNCVIEWER_PRIORITY
+	int "VNC Viewer task priority"
+	default 100
+
+config SYSTEM_VNCVIEWER_STACKSIZE
+	int "VNC Viewer stack size"
+	default 4096
+
+endif

system/vncviewer/Make.defs

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+############################################################################
+# apps/system/vncviewer/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_SYSTEM_VNCVIEWER),)
+CONFIGURED_APPS += $(APPDIR)/system/vncviewer
+endif

system/vncviewer/Makefile

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+############################################################################
+# apps/system/vncviewer/Makefile
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# VNC Viewer built-in application info
+
+PROGNAME = $(CONFIG_SYSTEM_VNCVIEWER_PROGNAME)
+PRIORITY = $(CONFIG_SYSTEM_VNCVIEWER_PRIORITY)
+STACKSIZE = $(CONFIG_SYSTEM_VNCVIEWER_STACKSIZE)
+MODULE = $(CONFIG_SYSTEM_VNCVIEWER)
+
+# VNC Viewer sources
+
+MAINSRC = vncviewer_main.c
+CSRCS   = rfb_protocol.c lcd_render.c
+
+include $(APPDIR)/Application.mk

system/vncviewer/lcd_render.c

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+/****************************************************************************
+ * apps/system/vncviewer/lcd_render.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#include <nuttx/video/fb.h>
+#include <nuttx/lcd/lcd_dev.h>
+
+#include "lcd_render.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lcd_init
+ ****************************************************************************/
+
+int lcd_init(struct lcd_ctx_s *ctx, int devno)
+{
+  char devpath[16];
+  int ret;
+
+  snprintf(devpath, sizeof(devpath), "/dev/lcd%d", devno);
+
+  ctx->fd = open(devpath, O_RDWR);
+  if (ctx->fd < 0)
+    {
+      printf("vncviewer: failed to open %s: %d\n", devpath, errno);
+      return -errno;
+    }
+
+  /* Query LCD resolution */
+
+  struct fb_videoinfo_s vinfo;
+  ret = ioctl(ctx->fd, LCDDEVIO_GETVIDEOINFO,
+             (unsigned long)(uintptr_t)&vinfo);
+  if (ret < 0)
+    {
+      printf("vncviewer: GETVIDEOINFO failed: %d\n", errno);
+      close(ctx->fd);
+      ctx->fd = -1;
+      return -errno;
+    }
+  else
+    {
+      ctx->xres = vinfo.xres;
+      ctx->yres = vinfo.yres;
+      ctx->fmt  = vinfo.fmt;
+    }
+
+  printf("vncviewer: LCD %s opened (%ux%u)\n",
+         devpath, ctx->xres, ctx->yres);
+
+  /* Set power on */
+
+  ret = ioctl(ctx->fd, LCDDEVIO_SETPOWER, 1);
+  if (ret < 0)
+    {
+      printf("vncviewer: WARNING: SETPOWER failed: %d\n", errno);
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: lcd_put_row
+ ****************************************************************************/
+
+int lcd_put_row(struct lcd_ctx_s *ctx, uint16_t x, uint16_t y,
+                uint16_t w, const uint16_t *pixels)
+{
+  struct lcddev_area_s area;
+  int ret;
+
+  /* Clip to LCD bounds */
+
+  if (x >= ctx->xres || y >= ctx->yres)
+    {
+      return OK;
+    }
+
+  if (x + w > ctx->xres)
+    {
+      w = ctx->xres - x;
+    }
+
+  area.row_start = y;
+  area.row_end   = y;
+  area.col_start = x;
+  area.col_end   = x + w - 1;
+  area.data      = (uint8_t *)pixels;
+
+  ret = ioctl(ctx->fd, LCDDEVIO_PUTAREA, (unsigned long)(uintptr_t)&area);
+  if (ret < 0)
+    {
+      return -errno;
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: lcd_fill
+ ****************************************************************************/
+
+int lcd_fill(struct lcd_ctx_s *ctx, uint16_t color)
+{
+  uint16_t y;
+  uint16_t i;
+  uint16_t w = ctx->xres;
+  FAR uint16_t *rowbuf;
+
+  rowbuf = (FAR uint16_t *)malloc(w * sizeof(uint16_t));
+  if (rowbuf == NULL)
+    {
+      return -ENOMEM;
+    }
+
+  for (i = 0; i < w; i++)
+    {
+      rowbuf[i] = color;
+    }
+
+  for (y = 0; y < ctx->yres; y++)
+    {
+      lcd_put_row(ctx, 0, y, w, rowbuf);
+    }
+
+  free(rowbuf);
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: lcd_uninit
+ ****************************************************************************/
+
+void lcd_uninit(struct lcd_ctx_s *ctx)
+{
+  if (ctx->fd >= 0)
+    {
+      close(ctx->fd);
+      ctx->fd = -1;
+    }
+}