first alpha version of libvncclient

1 files changed, 175 insertions, 0 deletions

diff --git a/libvncclient/cursor.c b/libvncclient/cursor.c
new file mode 100644
index 0000000..f6a7816
--- /dev/null
+++ b/libvncclient/cursor.c
@@ -0,0 +1,175 @@
+/*
+ *  Copyright (C) 2001,2002 Constantin Kaplinsky.  All Rights Reserved.
+ *
+ *  This is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This software is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this software; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ *  USA.
+ */
+
+/*
+ * cursor.c - code to support cursor shape updates (XCursor and
+ * RichCursor preudo-encodings).
+ */
+
+#include <rfb/rfbclient.h>
+
+
+#define OPER_SAVE     0
+#define OPER_RESTORE  1
+
+#define RGB24_TO_PIXEL(bpp,r,g,b)                                       \
+   ((((uint##bpp##_t)(r) & 0xFF) * client->format.redMax + 127) / 255             \
+    << client->format.redShift |                                              \
+    (((uint##bpp##_t)(g) & 0xFF) * client->format.greenMax + 127) / 255           \
+    << client->format.greenShift |                                            \
+    (((uint##bpp##_t)(b) & 0xFF) * client->format.blueMax + 127) / 255            \
+    << client->format.blueShift)
+
+
+/*********************************************************************
+ * HandleCursorShape(). Support for XCursor and RichCursor shape
+ * updates. We emulate cursor operating on the frame buffer (that is
+ * why we call it "software cursor").
+ ********************************************************************/
+
+Bool HandleCursorShape(rfbClient* client,int xhot, int yhot, int width, int height, uint32_t enc)
+{
+  int bytesPerPixel;
+  size_t bytesPerRow, bytesMaskData;
+  rfbXCursorColors rgb;
+  uint32_t colors[2];
+  char *buf;
+  uint8_t *ptr;
+  int x, y, b;
+
+  bytesPerPixel = client->format.bitsPerPixel / 8;
+  bytesPerRow = (width + 7) / 8;
+  bytesMaskData = bytesPerRow * height;
+
+  if (width * height == 0)
+    return TRUE;
+
+  /* Allocate memory for pixel data and temporary mask data. */
+  if(client->rcSource)
+    free(client->rcSource);
+
+  client->rcSource = malloc(width * height * bytesPerPixel);
+  if (client->rcSource == NULL)
+    return FALSE;
+
+  buf = malloc(bytesMaskData);
+  if (buf == NULL) {
+    free(client->rcSource);
+    client->rcSource = NULL;
+    return FALSE;
+  }
+
+  /* Read and decode cursor pixel data, depending on the encoding type. */
+
+  if (enc == rfbEncodingXCursor) {
+    /* Read and convert background and foreground colors. */
+    if (!ReadFromRFBServer(client, (char *)&rgb, sz_rfbXCursorColors)) {
+      free(client->rcSource);
+      client->rcSource = NULL;
+      free(buf);
+      return FALSE;
+    }
+    colors[0] = RGB24_TO_PIXEL(32, rgb.backRed, rgb.backGreen, rgb.backBlue);
+    colors[1] = RGB24_TO_PIXEL(32, rgb.foreRed, rgb.foreGreen, rgb.foreBlue);
+
+    /* Read 1bpp pixel data into a temporary buffer. */
+    if (!ReadFromRFBServer(client, buf, bytesMaskData)) {
+      free(client->rcSource);
+      client->rcSource = NULL;
+      free(buf);
+      return FALSE;
+    }
+
+    /* Convert 1bpp data to byte-wide color indices. */
+    ptr = client->rcSource;
+    for (y = 0; y < height; y++) {
+      for (x = 0; x < width / 8; x++) {
+	for (b = 7; b >= 0; b--) {
+	  *ptr = buf[y * bytesPerRow + x] >> b & 1;
+	  ptr += bytesPerPixel;
+	}
+      }
+      for (b = 7; b > 7 - width % 8; b--) {
+	*ptr = buf[y * bytesPerRow + x] >> b & 1;
+	ptr += bytesPerPixel;
+      }
+    }
+
+    /* Convert indices into the actual pixel values. */
+    switch (bytesPerPixel) {
+    case 1:
+      for (x = 0; x < width * height; x++)
+	client->rcSource[x] = (uint8_t)colors[client->rcSource[x]];
+      break;
+    case 2:
+      for (x = 0; x < width * height; x++)
+	((uint16_t *)client->rcSource)[x] = (uint16_t)colors[client->rcSource[x * 2]];
+      break;
+    case 4:
+      for (x = 0; x < width * height; x++)
+	((uint32_t *)client->rcSource)[x] = colors[client->rcSource[x * 4]];
+      break;
+    }
+
+  } else {			/* enc == rfbEncodingRichCursor */
+
+    if (!ReadFromRFBServer(client, (char *)client->rcSource, width * height * bytesPerPixel)) {
+      free(client->rcSource);
+      client->rcSource = NULL;
+      free(buf);
+      return FALSE;
+    }
+
+  }
+
+  /* Read and decode mask data. */
+
+  if (!ReadFromRFBServer(client, buf, bytesMaskData)) {
+    free(client->rcSource);
+    client->rcSource = NULL;
+    free(buf);
+    return FALSE;
+  }
+
+  client->rcMask = malloc(width * height);
+  if (client->rcMask == NULL) {
+    free(client->rcSource);
+    client->rcSource = NULL;
+    free(buf);
+    return FALSE;
+  }
+
+  ptr = client->rcMask;
+  for (y = 0; y < height; y++) {
+    for (x = 0; x < width / 8; x++) {
+      for (b = 7; b >= 0; b--) {
+	*ptr++ = buf[y * bytesPerRow + x] >> b & 1;
+      }
+    }
+    for (b = 7; b > 7 - width % 8; b--) {
+      *ptr++ = buf[y * bytesPerRow + x] >> b & 1;
+    }
+  }
+
+  free(buf);
+
+  return TRUE;
+}
+
+