cinelerra-5.1/guicast/bccapture.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "bccapture.h"
  23 #include "bcresources.h"
  24 #include "bcwindowbase.h"
  25 #include "bccmodels.h"
  26 #include "bccolors.h"
  27 #include "clip.h"
  28 #include "language.h"
  29 #include "vframe.h"
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <X11/Xutil.h>
  33 #include <X11/extensions/Xfixes.h>
  34
  35 // Byte orders:
  36 // 24 bpp packed:         bgr
  37 // 24 bpp unpacked:       0bgr
  38
  39
  40 BC_Capture::BC_Capture(int w, int h, const char *display_path)
  41 {
  42         this->w = w;
  43         this->h = h;
  44
  45         data = 0;
  46         use_shm = 1;
  47         for( int i=0; i<4; ++i ) border[i] = 0;
  48         bar_w = 0;  bar_color = 0;
  49         init_window(display_path);
  50         allocate_data();
  51 }
  52
  53 BC_Capture::~BC_Capture()
  54 {
  55         bars_off();
  56         delete_data();
  57         XCloseDisplay(display);
  58 }
  59
  60
  61 int BC_Capture::init_window(const char *display_path)
  62 {
  63         int bits_per_pixel;
  64         if( display_path && display_path[0] == 0 ) display_path = NULL;
  65         if( (display = XOpenDisplay(display_path)) == NULL ) {
  66                 printf(_("cannot connect to X server.\n"));
  67                 if( getenv("DISPLAY") == NULL )
  68                 printf(_("'DISPLAY' environment variable not set.\n"));
  69                 exit(-1);
  70                 return 1;
  71         }
  72
  73         screen = DefaultScreen(display);
  74         rootwin = RootWindow(display, screen);
  75         vis = DefaultVisual(display, screen);
  76         default_depth = DefaultDepth(display, screen);
  77         client_byte_order = (*(const u_int32_t*)"a   ") & 0x00000001;
  78         server_byte_order = (XImageByteOrder(display) == MSBFirst) ? 0 : 1;
  79         char *data = 0;
  80         XImage *ximage;
  81         ximage = XCreateImage(display, vis, default_depth,
  82                         ZPixmap, 0, data, 16, 16, 8, 0);
  83         bits_per_pixel = ximage->bits_per_pixel;
  84         XDestroyImage(ximage);
  85         bitmap_color_model = BC_WindowBase::evaluate_color_model(client_byte_order, server_byte_order, bits_per_pixel);
  86
  87 // test shared memory
  88 // This doesn't ensure the X Server is on the local host
  89         if( use_shm && !XShmQueryExtension(display) )
  90                 use_shm = 0;
  91         return 0;
  92 }
  93
  94 Window BC_Capture::bar(int x, int y, int w, int h, int color)
  95 {
  96         unsigned long mask = CWEventMask | CWBackPixel |
  97                         CWOverrideRedirect | CWSaveUnder;
  98         XSetWindowAttributes attr;
  99         memset(&attr, 0, sizeof(attr));
 100         Screen *scr = XDefaultScreenOfDisplay(display);
 101         Window root = RootWindowOfScreen(scr);
 102         Visual *vis = DefaultVisualOfScreen(scr);
 103         int depth = DefaultDepthOfScreen(scr);
 104         attr.background_pixel = color;
 105         attr.override_redirect = True;
 106         attr.save_under = True;
 107         Window win = XCreateWindow(display, root, x,y,w,h, 0,depth,
 108                         InputOutput, vis, mask, &attr);
 109         XMapWindow(display, win);
 110         return win;
 111 }
 112
 113 void BC_Capture::bars_on(int bw, int color, int x, int y, int w, int h)
 114 {
 115         this->bar_w = bw;
 116         this->bar_color = color;
 117         border[0] = bar(x-bw, y-bw, w+2*bw, bw, color);
 118         border[1] = bar(x-bw, y,    bw,     h,  color);
 119         border[2] = bar(x-bw, y+h,  w+2*bw, bw, color);
 120         border[3] = bar(x+w,  y,    bw,     h,  color);
 121         XFlush(display);
 122 }
 123
 124 void BC_Capture::bars_off()
 125 {
 126         for( int i=0; i<4; ++i ) {
 127                 if( !border[i] ) continue;
 128                 XUnmapWindow(display, border[i]);
 129         }
 130         for( int i=0; i<4; ++i ) {
 131                 if( !border[i] ) continue;
 132                 XDestroyWindow(display, border[i]);
 133                 border[i] = 0;
 134         }
 135         XFlush(display);
 136 }
 137
 138 void BC_Capture::bars_reposition(int x, int y, int w, int h)
 139 {
 140         int bw = this->bar_w;
 141         if( border[0] )
 142                 XMoveResizeWindow(display, border[0], x-bw, y-bw, w+2*bw, bw);
 143         if( border[1] )
 144                 XMoveResizeWindow(display, border[1], x-bw, y,    bw,     h );
 145         if( border[2] )
 146                 XMoveResizeWindow(display, border[2], x-bw, y+h,  w+2*bw, bw);
 147         if( border[3] )
 148                 XMoveResizeWindow(display, border[3], x+w,  y,    bw,     h );
 149 }
 150
 151 int BC_Capture::allocate_data()
 152 {
 153 // try shared memory
 154         if( !display ) return 1;
 155         if( use_shm ) {
 156                 ximage = XShmCreateImage(display, vis, default_depth, ZPixmap, (char*)NULL, &shm_info, w, h);
 157
 158                 shm_info.shmid = shmget(IPC_PRIVATE, h * ximage->bytes_per_line, IPC_CREAT | 0600);
 159                 if( shm_info.shmid == -1 ) {
 160                         perror("BC_Capture::allocate_data shmget");
 161                         abort();
 162                 }
 163                 data = (unsigned char *)shmat(shm_info.shmid, NULL, 0);
 164                 shmctl(shm_info.shmid, IPC_RMID, 0);
 165                 ximage->data = shm_info.shmaddr = (char*)data;  // setting ximage->data stops BadValue
 166                 shm_info.readOnly = 0;
 167
 168 // Crashes here if remote server.
 169                 BC_Resources::error = 0;
 170                 XShmAttach(display, &shm_info);
 171                 XSync(display, False);
 172                 if( BC_Resources::error ) {
 173                         XDestroyImage(ximage);
 174                         shmdt(shm_info.shmaddr);
 175                         use_shm = 0;
 176                 }
 177         }
 178
 179         if( !use_shm ) {
 180 // need to use bytes_per_line for some X servers
 181                 data = 0;
 182                 ximage = XCreateImage(display, vis, default_depth, ZPixmap, 0, (char*)data, w, h, 8, 0);
 183                 data = (unsigned char*)malloc(h * ximage->bytes_per_line);
 184                 XDestroyImage(ximage);
 185
 186                 ximage = XCreateImage(display, vis, default_depth, ZPixmap, 0, (char*)data, w, h, 8, 0);
 187         }
 188
 189         row_data = new unsigned char*[h];
 190         for( int i = 0; i < h; i++ ) {
 191                 row_data[i] = &data[i * ximage->bytes_per_line];
 192         }
 193 // This differs from the depth parameter of the top_level.
 194         bits_per_pixel = ximage->bits_per_pixel;
 195         return 0;
 196 }
 197
 198 int BC_Capture::delete_data()
 199 {
 200         if( !display ) return 1;
 201         if( data ) {
 202                 if( use_shm ) {
 203                         XShmDetach(display, &shm_info);
 204                         XDestroyImage(ximage);
 205                         shmdt(shm_info.shmaddr);
 206                 }
 207                 else {
 208                         XDestroyImage(ximage);
 209                 }
 210
 211 // data is automatically freed by XDestroyImage
 212                 data = 0;
 213                 delete [] row_data;
 214         }
 215         return 0;
 216 }
 217
 218
 219 int BC_Capture::get_w() { return w; }
 220 int BC_Capture::get_h() { return h; }
 221
 222 // Capture a frame from the screen
 223 #define RGB_TO_YUV(y, u, v, r, g, b) { \
 224  YUV::yuv.rgb_to_yuv_8(r, g, b, y, u, v); \
 225  bclamp(y, 0,0xff); bclamp(u, 0,0xff); bclamp(v, 0,0xff); }
 226
 227 int BC_Capture::capture_frame(VFrame *frame, int &x1, int &y1,
 228         int do_cursor) // the scale of the cursor if nonzero
 229 {
 230         if( !display ) return 1;
 231         if( x1 < 0 ) x1 = 0;
 232         if( y1 < 0 ) y1 = 0;
 233         if( x1 > get_top_w() - w ) x1 = get_top_w() - w;
 234         if( y1 > get_top_h() - h ) y1 = get_top_h() - h;
 235
 236
 237 // Read the raw data
 238         if( use_shm )
 239                 XShmGetImage(display, rootwin, ximage, x1, y1, 0xffffffff);
 240         else
 241                 XGetSubImage(display, rootwin, x1, y1, w, h, 0xffffffff, ZPixmap, ximage, 0, 0);
 242
 243         BC_CModels::transfer(frame->get_rows(), row_data,
 244                 frame->get_y(), frame->get_u(), frame->get_v(), 0,
 245                 0, 0, 0, 0, w, h, 0, 0,
 246                 frame->get_w(), frame->get_h(),
 247                 bitmap_color_model, frame->get_color_model(),
 248                 0, frame->get_w(), w);
 249
 250         if( do_cursor ) {
 251                 XFixesCursorImage *cursor;
 252                 cursor = XFixesGetCursorImage(display);
 253                 if( cursor ) {
 254 //printf("BC_Capture::capture_frame %d cursor=%p colormodel=%d\n",
 255 // __LINE__, cursor, frame->get_color_model());
 256                         int scale = do_cursor;
 257                         int cursor_x = cursor->x - x1 - cursor->xhot * scale;
 258                         int cursor_y = cursor->y - y1 - cursor->yhot * scale;
 259                         int w = frame->get_w();
 260                         int h = frame->get_h();
 261                         for( int i = 0; i < cursor->height; i++ ) {
 262                                 for( int yscale = 0; yscale < scale; yscale++ ) {
 263                                         if( cursor_y + i * scale + yscale >= 0 &&
 264                                                 cursor_y + i * scale + yscale < h ) {
 265                                                 unsigned char *src = (unsigned char*)(cursor->pixels +
 266                                                         i * cursor->width);
 267                                                 int dst_y = cursor_y + i * scale + yscale;
 268                                                 int dst_x = cursor_x;
 269                                                 for( int j = 0; j < cursor->width; j++ ) {
 270                                                         for( int xscale = 0; xscale < scale ; xscale++ ) {
 271                                                                 if( cursor_x + j * scale + xscale >= 0 &&
 272                                                                         cursor_x + j * scale + xscale < w ) {
 273                                                                         int a = src[3];
 274                                                                         int invert_a = 0xff - a;
 275                                                                         int r = src[2];
 276                                                                         int g = src[1];
 277                                                                         int b = src[0];
 278                                                                         switch( frame->get_color_model() ) {
 279                                                                         case BC_RGB888: {
 280                                                                                 unsigned char *dst = frame->get_rows()[dst_y] +
 281                                                                                         dst_x * 3;
 282                                                                                 dst[0] = (r * a + dst[0] * invert_a) / 0xff;
 283                                                                                 dst[1] = (g * a + dst[1] * invert_a) / 0xff;
 284                                                                                 dst[2] = (b * a + dst[2] * invert_a) / 0xff;
 285                                                                                 break; }
 286
 287                                                                         case BC_YUV420P: {
 288                                                                                 unsigned char *dst_y_ = frame->get_y() +
 289                                                                                         dst_y * w + dst_x;
 290                                                                                 unsigned char *dst_u = frame->get_u() +
 291                                                                                         (dst_y / 2) * (w / 2) + (dst_x / 2);
 292                                                                                 unsigned char *dst_v = frame->get_v() +
 293                                                                                         (dst_y / 2) * (w / 2) + (dst_x / 2);
 294                                                                                 int y, u, v;
 295                                                                                 RGB_TO_YUV(y, u, v, r, g, b);
 296
 297                                                                                 *dst_y_ = (y * a + *dst_y_ * invert_a) / 0xff;
 298                                                                                 *dst_u = (u * a + *dst_u * invert_a) / 0xff;
 299                                                                                 *dst_v = (v * a + *dst_v * invert_a) / 0xff;
 300                                                                                 break; }
 301                                                                         }
 302                                                                 }
 303                                                                 dst_x++;
 304                                                         }
 305                                                         src += sizeof(long);
 306                                                 }
 307                                         }
 308                                 }
 309                         }
 310
 311 // This frees cursor->pixels
 312                         XFree(cursor);
 313                 }
 314         }
 315
 316         return 0;
 317 }
 318
 319 int BC_Capture::get_top_w()
 320 {
 321         Screen *screen_ptr = XDefaultScreenOfDisplay(display);
 322         return WidthOfScreen(screen_ptr);
 323 }
 324
 325 int BC_Capture::get_top_h()
 326 {
 327         Screen *screen_ptr = XDefaultScreenOfDisplay(display);
 328         return HeightOfScreen(screen_ptr);
 329 }