guacamole-spice-protocol/src/protocols/vnc/cursor.c

129 lines
4.0 KiB
C

/*
* 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 "config.h"
#include "client.h"
#include "common/cursor.h"
#include "common/display.h"
#include "common/surface.h"
#include "vnc.h"
#include <cairo/cairo.h>
#include <guacamole/client.h>
#include <guacamole/layer.h>
#include <guacamole/protocol.h>
#include <guacamole/socket.h>
#include <rfb/rfbclient.h>
#include <rfb/rfbproto.h>
/* Define cairo_format_stride_for_width() if missing */
#ifndef HAVE_CAIRO_FORMAT_STRIDE_FOR_WIDTH
#define cairo_format_stride_for_width(format, width) (width*4)
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <syslog.h>
void guac_vnc_cursor(rfbClient* client, int x, int y, int w, int h, int bpp) {
guac_client* gc = rfbClientGetClientData(client, GUAC_VNC_CLIENT_KEY);
guac_vnc_client* vnc_client = (guac_vnc_client*) gc->data;
/* Cairo image buffer */
int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, w);
unsigned char* buffer = malloc(h*stride);
unsigned char* buffer_row_current = buffer;
/* VNC image buffer */
unsigned int fb_stride = bpp * w;
unsigned char* fb_row_current = client->rcSource;
unsigned char* fb_mask = client->rcMask;
int dx, dy;
/* Copy image data from VNC client to RGBA buffer */
for (dy = 0; dy<h; dy++) {
unsigned int* buffer_current;
unsigned char* fb_current;
/* Get current buffer row, advance to next */
buffer_current = (unsigned int*) buffer_row_current;
buffer_row_current += stride;
/* Get current framebuffer row, advance to next */
fb_current = fb_row_current;
fb_row_current += fb_stride;
for (dx = 0; dx<w; dx++) {
unsigned char alpha, red, green, blue;
unsigned int v;
/* Read current pixel value */
switch (bpp) {
case 4:
v = *((uint32_t*) fb_current);
break;
case 2:
v = *((uint16_t*) fb_current);
break;
default:
v = *((uint8_t*) fb_current);
}
/* Translate mask to alpha */
if (*(fb_mask++)) alpha = 0xFF;
else alpha = 0x00;
/* Translate value to RGB */
red = (v >> client->format.redShift) * 0x100 / (client->format.redMax + 1);
green = (v >> client->format.greenShift) * 0x100 / (client->format.greenMax+ 1);
blue = (v >> client->format.blueShift) * 0x100 / (client->format.blueMax + 1);
/* Output ARGB */
if (vnc_client->settings->swap_red_blue)
*(buffer_current++) = (alpha << 24) | (blue << 16) | (green << 8) | red;
else
*(buffer_current++) = (alpha << 24) | (red << 16) | (green << 8) | blue;
/* Next VNC pixel */
fb_current += bpp;
}
}
/* Update stored cursor information */
guac_common_cursor_set_argb(vnc_client->display->cursor, x, y,
buffer, w, h, stride);
/* Free surface */
free(buffer);
/* libvncclient does not free rcMask as it does rcSource */
free(client->rcMask);
}