cscg24-guacamole

CSCG 2024 Challenge 'Guacamole Mashup'
git clone https://git.sinitax.com/sinitax/cscg24-guacamole
Log | Files | Refs | sfeed.txt

cursor.c (4111B)

      1/*
      2 * Licensed to the Apache Software Foundation (ASF) under one
      3 * or more contributor license agreements.  See the NOTICE file
      4 * distributed with this work for additional information
      5 * regarding copyright ownership.  The ASF licenses this file
      6 * to you under the Apache License, Version 2.0 (the
      7 * "License"); you may not use this file except in compliance
      8 * with the License.  You may obtain a copy of the License at
      9 *
     10 *   http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing,
     13 * software distributed under the License is distributed on an
     14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     15 * KIND, either express or implied.  See the License for the
     16 * specific language governing permissions and limitations
     17 * under the License.
     18 */
     19
     20#include "config.h"
     21
     22#include "client.h"
     23#include "common/cursor.h"
     24#include "common/display.h"
     25#include "common/surface.h"
     26#include "vnc.h"
     27
     28#include <cairo/cairo.h>
     29#include <guacamole/client.h>
     30#include <guacamole/layer.h>
     31#include <guacamole/mem.h>
     32#include <guacamole/protocol.h>
     33#include <guacamole/socket.h>
     34#include <rfb/rfbclient.h>
     35#include <rfb/rfbproto.h>
     36
     37/* Define cairo_format_stride_for_width() if missing */
     38#ifndef HAVE_CAIRO_FORMAT_STRIDE_FOR_WIDTH
     39#define cairo_format_stride_for_width(format, width) (width*4)
     40#endif
     41
     42#include <stdarg.h>
     43#include <stdio.h>
     44#include <stdint.h>
     45#include <stdlib.h>
     46#include <syslog.h>
     47
     48void guac_vnc_cursor(rfbClient* client, int x, int y, int w, int h, int bpp) {
     49
     50    guac_client* gc = rfbClientGetClientData(client, GUAC_VNC_CLIENT_KEY);
     51    guac_vnc_client* vnc_client = (guac_vnc_client*) gc->data;
     52
     53    /* Cairo image buffer */
     54    int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, w);
     55    unsigned char* buffer = guac_mem_alloc(h, stride);
     56    unsigned char* buffer_row_current = buffer;
     57
     58    /* VNC image buffer */
     59    unsigned int fb_stride = bpp * w;
     60    unsigned char* fb_row_current = client->rcSource;
     61    unsigned char* fb_mask = client->rcMask;
     62
     63    int dx, dy;
     64
     65    /* Copy image data from VNC client to RGBA buffer */
     66    for (dy = 0; dy<h; dy++) {
     67
     68        unsigned int*  buffer_current;
     69        unsigned char* fb_current;
     70        
     71        /* Get current buffer row, advance to next */
     72        buffer_current      = (unsigned int*) buffer_row_current;
     73        buffer_row_current += stride;
     74
     75        /* Get current framebuffer row, advance to next */
     76        fb_current      = fb_row_current;
     77        fb_row_current += fb_stride;
     78
     79        for (dx = 0; dx<w; dx++) {
     80
     81            unsigned char alpha, red, green, blue;
     82            unsigned int v;
     83
     84            /* Read current pixel value */
     85            switch (bpp) {
     86                case 4:
     87                    v = *((uint32_t*) fb_current);
     88                    break;
     89
     90                case 2:
     91                    v = *((uint16_t*) fb_current);
     92                    break;
     93
     94                default:
     95                    v = *((uint8_t*)  fb_current);
     96            }
     97
     98            /* Translate mask to alpha */
     99            if (*(fb_mask++)) alpha = 0xFF;
    100            else              alpha = 0x00;
    101
    102            /* Translate value to RGB */
    103            red   = (v >> client->format.redShift)   * 0x100 / (client->format.redMax  + 1);
    104            green = (v >> client->format.greenShift) * 0x100 / (client->format.greenMax+ 1);
    105            blue  = (v >> client->format.blueShift)  * 0x100 / (client->format.blueMax + 1);
    106
    107            /* Output ARGB */
    108            if (vnc_client->settings->swap_red_blue)
    109                *(buffer_current++) = (alpha << 24) | (blue << 16) | (green << 8) | red;
    110            else
    111                *(buffer_current++) = (alpha << 24) | (red  << 16) | (green << 8) | blue;
    112
    113            /* Next VNC pixel */
    114            fb_current += bpp;
    115
    116        }
    117    }
    118
    119    /* Update stored cursor information */
    120    guac_common_cursor_set_argb(vnc_client->display->cursor, x, y,
    121            buffer, w, h, stride);
    122
    123    /* Free surface */
    124    guac_mem_free(buffer);
    125
    126    /* libvncclient does not free rcMask as it does rcSource */
    127    free(client->rcMask);
    128}
    129