dlls/winex11.drv/xvidmode.c

   1 /*
   2  * DirectDraw XVidMode interface
   3  *
   4  * Copyright 2001 TransGaming Technologies, Inc.
   5  * Copyright 2020 Zhiyi Zhang for CodeWeavers
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "config.h"
  23
  24 #include <assert.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <math.h>
  28 #include <dlfcn.h>
  29
  30 #define NONAMELESSSTRUCT
  31 #define NONAMELESSUNION
  32
  33 #include "x11drv.h"
  34
  35 #ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
  36 #include <X11/extensions/xf86vmode.h>
  37 #endif
  38 #ifdef HAVE_X11_EXTENSIONS_XF86VMPROTO_H
  39 #include <X11/extensions/xf86vmproto.h>
  40 #endif
  41
  42 #include "windef.h"
  43 #include "wingdi.h"
  44 #include "wine/debug.h"
  45 #include "wine/heap.h"
  46
  47 WINE_DEFAULT_DEBUG_CHANNEL(xvidmode);
  48
  49 #ifdef SONAME_LIBXXF86VM
  50
  51 extern BOOL usexvidmode;
  52
  53 static int xf86vm_event, xf86vm_error, xf86vm_major, xf86vm_minor;
  54
  55 #ifdef X_XF86VidModeSetGammaRamp
  56 static int xf86vm_gammaramp_size;
  57 static BOOL xf86vm_use_gammaramp;
  58 #endif /* X_XF86VidModeSetGammaRamp */
  59
  60 #define MAKE_FUNCPTR(f) static typeof(f) * p##f;
  61 MAKE_FUNCPTR(XF86VidModeGetAllModeLines)
  62 MAKE_FUNCPTR(XF86VidModeGetModeLine)
  63 MAKE_FUNCPTR(XF86VidModeLockModeSwitch)
  64 MAKE_FUNCPTR(XF86VidModeQueryExtension)
  65 MAKE_FUNCPTR(XF86VidModeQueryVersion)
  66 MAKE_FUNCPTR(XF86VidModeSetViewPort)
  67 MAKE_FUNCPTR(XF86VidModeSwitchToMode)
  68 #ifdef X_XF86VidModeSetGamma
  69 MAKE_FUNCPTR(XF86VidModeGetGamma)
  70 MAKE_FUNCPTR(XF86VidModeSetGamma)
  71 #endif
  72 #ifdef X_XF86VidModeSetGammaRamp
  73 MAKE_FUNCPTR(XF86VidModeGetGammaRamp)
  74 MAKE_FUNCPTR(XF86VidModeGetGammaRampSize)
  75 MAKE_FUNCPTR(XF86VidModeSetGammaRamp)
  76 #endif
  77 #undef MAKE_FUNCPTR
  78
  79 static int XVidModeErrorHandler(Display *dpy, XErrorEvent *event, void *arg)
  80 {
  81     return 1;
  82 }
  83
  84 /* XF86VidMode display settings handler */
  85 static BOOL xf86vm_get_id(const WCHAR *device_name, ULONG_PTR *id)
  86 {
  87     WCHAR primary_adapter[CCHDEVICENAME];
  88
  89     if (!get_primary_adapter( primary_adapter ))
  90         return FALSE;
  91
  92     /* XVidMode only supports changing the primary adapter settings.
  93      * For non-primary adapters, an id is still provided but getting
  94      * and changing non-primary adapters' settings will be ignored. */
  95     *id = !lstrcmpiW( device_name, primary_adapter ) ? 1 : 0;
  96     return TRUE;
  97 }
  98
  99 static void add_xf86vm_mode(DEVMODEW *mode, DWORD depth, const XF86VidModeModeInfo *mode_info)
 100 {
 101     mode->dmSize = sizeof(*mode);
 102     mode->dmDriverExtra = sizeof(mode_info);
 103     mode->dmFields = DM_DISPLAYORIENTATION | DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFLAGS;
 104     if (mode_info->htotal && mode_info->vtotal)
 105     {
 106         mode->dmFields |= DM_DISPLAYFREQUENCY;
 107         mode->dmDisplayFrequency = mode_info->dotclock * 1000 / (mode_info->htotal * mode_info->vtotal);
 108     }
 109     mode->u1.s2.dmDisplayOrientation = DMDO_DEFAULT;
 110     mode->dmBitsPerPel = depth;
 111     mode->dmPelsWidth = mode_info->hdisplay;
 112     mode->dmPelsHeight = mode_info->vdisplay;
 113     mode->u2.dmDisplayFlags = 0;
 114     memcpy((BYTE *)mode + sizeof(*mode), &mode_info, sizeof(mode_info));
 115 }
 116
 117 static BOOL xf86vm_get_modes(ULONG_PTR id, DWORD flags, DEVMODEW **new_modes, UINT *mode_count)
 118 {
 119     INT xf86vm_mode_idx, xf86vm_mode_count;
 120     XF86VidModeModeInfo **xf86vm_modes;
 121     UINT depth_idx, mode_idx = 0;
 122     DEVMODEW *modes, *mode;
 123     SIZE_T size;
 124     BYTE *ptr;
 125     Bool ret;
 126
 127     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 128     ret = pXF86VidModeGetAllModeLines(gdi_display, DefaultScreen(gdi_display), &xf86vm_mode_count, &xf86vm_modes);
 129     if (X11DRV_check_error() || !ret || !xf86vm_mode_count)
 130         return FALSE;
 131
 132     /* Put a XF86VidModeModeInfo ** at the start to store the XF86VidMode modes pointer */
 133     size = sizeof(XF86VidModeModeInfo **);
 134     /* Display modes in different color depth, with a XF86VidModeModeInfo * at the end of each
 135      * DEVMODEW as driver private data */
 136     size += (xf86vm_mode_count * DEPTH_COUNT) * (sizeof(DEVMODEW) + sizeof(XF86VidModeModeInfo *));
 137     ptr = heap_alloc_zero(size);
 138     if (!ptr)
 139     {
 140         SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 141         return FALSE;
 142     }
 143
 144     memcpy(ptr, &xf86vm_modes, sizeof(xf86vm_modes));
 145     modes = (DEVMODEW *)(ptr + sizeof(xf86vm_modes));
 146
 147     for (depth_idx = 0; depth_idx < DEPTH_COUNT; ++depth_idx)
 148     {
 149         for (xf86vm_mode_idx = 0; xf86vm_mode_idx < xf86vm_mode_count; ++xf86vm_mode_idx)
 150         {
 151             mode = (DEVMODEW *)((BYTE *)modes + (sizeof(DEVMODEW) + sizeof(XF86VidModeModeInfo *)) * mode_idx++);
 152             add_xf86vm_mode(mode, depths[depth_idx], xf86vm_modes[xf86vm_mode_idx]);
 153         }
 154     }
 155
 156     *new_modes = modes;
 157     *mode_count = mode_idx;
 158     return TRUE;
 159 }
 160
 161 static void xf86vm_free_modes(DEVMODEW *modes)
 162 {
 163     XF86VidModeModeInfo **xf86vm_modes;
 164
 165     if (modes)
 166     {
 167         assert(modes[0].dmDriverExtra == sizeof(XF86VidModeModeInfo *));
 168         memcpy(&xf86vm_modes, (BYTE *)modes - sizeof(xf86vm_modes), sizeof(xf86vm_modes));
 169         XFree(xf86vm_modes);
 170     }
 171     heap_free(modes);
 172 }
 173
 174 static BOOL xf86vm_get_current_mode(ULONG_PTR id, DEVMODEW *mode)
 175 {
 176     XF86VidModeModeLine xf86vm_mode;
 177     INT dotclock;
 178     Bool ret;
 179
 180     mode->dmFields = DM_DISPLAYORIENTATION | DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT |
 181                      DM_DISPLAYFLAGS | DM_DISPLAYFREQUENCY | DM_POSITION;
 182     mode->u1.s2.dmDisplayOrientation = DMDO_DEFAULT;
 183     mode->u2.dmDisplayFlags = 0;
 184     mode->u1.s2.dmPosition.x = 0;
 185     mode->u1.s2.dmPosition.y = 0;
 186
 187     if (id != 1)
 188     {
 189         FIXME("Non-primary adapters are unsupported.\n");
 190         mode->dmBitsPerPel = 0;
 191         mode->dmPelsWidth = 0;
 192         mode->dmPelsHeight = 0;
 193         mode->dmDisplayFrequency = 0;
 194         return TRUE;
 195     }
 196
 197     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 198     ret = pXF86VidModeGetModeLine(gdi_display, DefaultScreen(gdi_display), &dotclock, &xf86vm_mode);
 199     if (X11DRV_check_error() || !ret)
 200         return FALSE;
 201
 202     mode->dmBitsPerPel = screen_bpp;
 203     mode->dmPelsWidth = xf86vm_mode.hdisplay;
 204     mode->dmPelsHeight = xf86vm_mode.vdisplay;
 205     if (xf86vm_mode.htotal && xf86vm_mode.vtotal)
 206         mode->dmDisplayFrequency = dotclock * 1000 / (xf86vm_mode.htotal * xf86vm_mode.vtotal);
 207     else
 208         mode->dmDisplayFrequency = 0;
 209
 210     if (xf86vm_mode.privsize)
 211         XFree(xf86vm_mode.private);
 212     return TRUE;
 213 }
 214
 215 static LONG xf86vm_set_current_mode(ULONG_PTR id, DEVMODEW *mode)
 216 {
 217     XF86VidModeModeInfo *xf86vm_mode;
 218     Bool ret;
 219
 220     if (id != 1)
 221     {
 222         FIXME("Non-primary adapters are unsupported.\n");
 223         return DISP_CHANGE_SUCCESSFUL;
 224     }
 225
 226     if (is_detached_mode(mode))
 227     {
 228         FIXME("Detaching adapters is unsupported.\n");
 229         return DISP_CHANGE_SUCCESSFUL;
 230     }
 231
 232     if (mode->dmFields & DM_BITSPERPEL && mode->dmBitsPerPel != screen_bpp)
 233         WARN("Cannot change screen bit depth from %dbits to %dbits!\n", screen_bpp, mode->dmBitsPerPel);
 234
 235     assert(mode->dmDriverExtra == sizeof(XF86VidModeModeInfo *));
 236     memcpy(&xf86vm_mode, (BYTE *)mode + sizeof(*mode), sizeof(xf86vm_mode));
 237     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 238     ret = pXF86VidModeSwitchToMode(gdi_display, DefaultScreen(gdi_display), xf86vm_mode);
 239     if (X11DRV_check_error() || !ret)
 240         return DISP_CHANGE_FAILED;
 241 #if 0 /* it is said that SetViewPort causes problems with some X servers */
 242     pXF86VidModeSetViewPort(gdi_display, DefaultScreen(gdi_display), 0, 0);
 243 #else
 244     XWarpPointer(gdi_display, None, DefaultRootWindow(gdi_display), 0, 0, 0, 0, 0, 0);
 245 #endif
 246     XFlush(gdi_display);
 247     return DISP_CHANGE_SUCCESSFUL;
 248 }
 249
 250 void X11DRV_XF86VM_Init(void)
 251 {
 252   struct x11drv_settings_handler xf86vm_handler;
 253   void *xvidmode_handle;
 254   Bool ok;
 255
 256   if (xf86vm_major) return; /* already initialized? */
 257
 258   xvidmode_handle = dlopen(SONAME_LIBXXF86VM, RTLD_NOW);
 259   if (!xvidmode_handle)
 260   {
 261     TRACE("Unable to open %s, XVidMode disabled\n", SONAME_LIBXXF86VM);
 262     usexvidmode = FALSE;
 263     return;
 264   }
 265
 266 #define LOAD_FUNCPTR(f) \
 267     if((p##f = dlsym(xvidmode_handle, #f)) == NULL) goto sym_not_found
 268     LOAD_FUNCPTR(XF86VidModeGetAllModeLines);
 269     LOAD_FUNCPTR(XF86VidModeGetModeLine);
 270     LOAD_FUNCPTR(XF86VidModeLockModeSwitch);
 271     LOAD_FUNCPTR(XF86VidModeQueryExtension);
 272     LOAD_FUNCPTR(XF86VidModeQueryVersion);
 273     LOAD_FUNCPTR(XF86VidModeSetViewPort);
 274     LOAD_FUNCPTR(XF86VidModeSwitchToMode);
 275 #ifdef X_XF86VidModeSetGamma
 276     LOAD_FUNCPTR(XF86VidModeGetGamma);
 277     LOAD_FUNCPTR(XF86VidModeSetGamma);
 278 #endif
 279 #ifdef X_XF86VidModeSetGammaRamp
 280     LOAD_FUNCPTR(XF86VidModeGetGammaRamp);
 281     LOAD_FUNCPTR(XF86VidModeGetGammaRampSize);
 282     LOAD_FUNCPTR(XF86VidModeSetGammaRamp);
 283 #endif
 284 #undef LOAD_FUNCPTR
 285
 286   /* see if XVidMode is available */
 287   if (!pXF86VidModeQueryExtension(gdi_display, &xf86vm_event, &xf86vm_error)) return;
 288
 289   X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 290   ok = pXF86VidModeQueryVersion(gdi_display, &xf86vm_major, &xf86vm_minor);
 291   if (X11DRV_check_error() || !ok) return;
 292
 293 #ifdef X_XF86VidModeSetGammaRamp
 294   if (xf86vm_major > 2 || (xf86vm_major == 2 && xf86vm_minor >= 1))
 295   {
 296       X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 297       pXF86VidModeGetGammaRampSize(gdi_display, DefaultScreen(gdi_display),
 298                                    &xf86vm_gammaramp_size);
 299       if (X11DRV_check_error()) xf86vm_gammaramp_size = 0;
 300       TRACE("Gamma ramp size %d.\n", xf86vm_gammaramp_size);
 301       if (xf86vm_gammaramp_size >= GAMMA_RAMP_SIZE)
 302           xf86vm_use_gammaramp = TRUE;
 303   }
 304 #endif /* X_XF86VidModeSetGammaRamp */
 305
 306   if (!usexvidmode)
 307     return;
 308
 309   xf86vm_handler.name = "XF86VidMode";
 310   xf86vm_handler.priority = 100;
 311   xf86vm_handler.get_id = xf86vm_get_id;
 312   xf86vm_handler.get_modes = xf86vm_get_modes;
 313   xf86vm_handler.free_modes = xf86vm_free_modes;
 314   xf86vm_handler.get_current_mode = xf86vm_get_current_mode;
 315   xf86vm_handler.set_current_mode = xf86vm_set_current_mode;
 316   X11DRV_Settings_SetHandler(&xf86vm_handler);
 317   return;
 318
 319 sym_not_found:
 320     TRACE("Unable to load function pointers from %s, XVidMode disabled\n", SONAME_LIBXXF86VM);
 321     dlclose(xvidmode_handle);
 322     xvidmode_handle = NULL;
 323     usexvidmode = FALSE;
 324 }
 325
 326 /***** GAMMA CONTROL *****/
 327 /* (only available in XF86VidMode 2.x) */
 328
 329 #ifdef X_XF86VidModeSetGamma
 330
 331 static void GenerateRampFromGamma(WORD ramp[GAMMA_RAMP_SIZE], float gamma)
 332 {
 333   float r_gamma = 1/gamma;
 334   unsigned i;
 335   TRACE("gamma is %f\n", r_gamma);
 336   for (i=0; i<GAMMA_RAMP_SIZE; i++)
 337     ramp[i] = pow(i/255.0, r_gamma) * 65535.0;
 338 }
 339
 340 static BOOL ComputeGammaFromRamp(WORD ramp[GAMMA_RAMP_SIZE], float *gamma)
 341 {
 342   float r_x, r_y, r_lx, r_ly, r_d, r_v, r_e, g_avg, g_min, g_max;
 343   unsigned i, f, l, g_n, c;
 344   f = ramp[0];
 345   l = ramp[255];
 346   if (f >= l) {
 347     ERR("inverted or flat gamma ramp (%d->%d), rejected\n", f, l);
 348     return FALSE;
 349   }
 350   r_d = l - f;
 351   g_min = g_max = g_avg = 0.0;
 352   /* check gamma ramp entries to estimate the gamma */
 353   TRACE("analyzing gamma ramp (%d->%d)\n", f, l);
 354   for (i=1, g_n=0; i<255; i++) {
 355     if (ramp[i] < f || ramp[i] > l) {
 356       ERR("strange gamma ramp ([%d]=%d for %d->%d), rejected\n", i, ramp[i], f, l);
 357       return FALSE;
 358     }
 359     c = ramp[i] - f;
 360     if (!c) continue; /* avoid log(0) */
 361
 362     /* normalize entry values into 0..1 range */
 363     r_x = i/255.0; r_y = c / r_d;
 364     /* compute logarithms of values */
 365     r_lx = log(r_x); r_ly = log(r_y);
 366     /* compute gamma for this entry */
 367     r_v = r_ly / r_lx;
 368     /* compute differential (error estimate) for this entry */
 369     /* some games use table-based logarithms that magnifies the error by 128 */
 370     r_e = -r_lx * 128 / (c * r_lx * r_lx);
 371
 372     /* compute min & max while compensating for estimated error */
 373     if (!g_n || g_min > (r_v + r_e)) g_min = r_v + r_e;
 374     if (!g_n || g_max < (r_v - r_e)) g_max = r_v - r_e;
 375
 376     /* add to average */
 377     g_avg += r_v;
 378     g_n++;
 379     /* TRACE("[%d]=%d, gamma=%f, error=%f\n", i, ramp[i], r_v, r_e); */
 380   }
 381   if (!g_n) {
 382     ERR("no gamma data, shouldn't happen\n");
 383     return FALSE;
 384   }
 385   g_avg /= g_n;
 386   TRACE("low bias is %d, high is %d, gamma is %5.3f\n", f, 65535-l, g_avg);
 387   /* the bias could be because the app wanted something like a "red shift"
 388    * like when you're hit in Quake, but XVidMode doesn't support it,
 389    * so we have to reject a significant bias */
 390   if (f && f > (pow(1/255.0, g_avg) * 65536.0)) {
 391     ERR("low-biased gamma ramp (%d), rejected\n", f);
 392     return FALSE;
 393   }
 394   /* check that the gamma is reasonably uniform across the ramp */
 395   if (g_max - g_min > 12.8) {
 396     ERR("ramp not uniform (max=%f, min=%f, avg=%f), rejected\n", g_max, g_min, g_avg);
 397     return FALSE;
 398   }
 399   /* check that the gamma is not too bright */
 400   if (g_avg < 0.2) {
 401     ERR("too bright gamma ( %5.3f), rejected\n", g_avg);
 402     return FALSE;
 403   }
 404   /* ok, now we're pretty sure we can set the desired gamma ramp,
 405    * so go for it */
 406   *gamma = 1/g_avg;
 407   return TRUE;
 408 }
 409
 410 #endif /* X_XF86VidModeSetGamma */
 411
 412 /* Hmm... should gamma control be available in desktop mode or not?
 413  * I'll assume that it should */
 414
 415 #ifdef X_XF86VidModeSetGammaRamp
 416 static void interpolate_gamma_ramp(WORD *dst_r, WORD *dst_g, WORD *dst_b, unsigned int dst_size,
 417         const WORD *src_r, const WORD *src_g, const WORD *src_b, unsigned int src_size)
 418 {
 419     double position, distance;
 420     unsigned int dst_i, src_i;
 421
 422     for (dst_i = 0; dst_i < dst_size; ++dst_i)
 423     {
 424         position = dst_i * (src_size - 1) / (double)(dst_size - 1);
 425         src_i = position;
 426
 427         if (src_i + 1 < src_size)
 428         {
 429             distance = position - src_i;
 430
 431             dst_r[dst_i] = (1.0 - distance) * src_r[src_i] + distance * src_r[src_i + 1] + 0.5;
 432             dst_g[dst_i] = (1.0 - distance) * src_g[src_i] + distance * src_g[src_i + 1] + 0.5;
 433             dst_b[dst_i] = (1.0 - distance) * src_b[src_i] + distance * src_b[src_i + 1] + 0.5;
 434         }
 435         else
 436         {
 437             dst_r[dst_i] = src_r[src_i];
 438             dst_g[dst_i] = src_g[src_i];
 439             dst_b[dst_i] = src_b[src_i];
 440         }
 441     }
 442 }
 443
 444 static BOOL xf86vm_get_gamma_ramp(struct x11drv_gamma_ramp *ramp)
 445 {
 446     WORD *red, *green, *blue;
 447     BOOL ret;
 448
 449     if (xf86vm_gammaramp_size == GAMMA_RAMP_SIZE)
 450     {
 451         red = ramp->red;
 452         green = ramp->green;
 453         blue = ramp->blue;
 454     }
 455     else
 456     {
 457         if (!(red = heap_calloc(xf86vm_gammaramp_size, 3 * sizeof(*red))))
 458             return FALSE;
 459         green = red + xf86vm_gammaramp_size;
 460         blue = green + xf86vm_gammaramp_size;
 461     }
 462
 463     ret = pXF86VidModeGetGammaRamp(gdi_display, DefaultScreen(gdi_display),
 464                                    xf86vm_gammaramp_size, red, green, blue);
 465     if (ret && red != ramp->red)
 466         interpolate_gamma_ramp(ramp->red, ramp->green, ramp->blue, GAMMA_RAMP_SIZE,
 467                                red, green, blue, xf86vm_gammaramp_size);
 468     if (red != ramp->red)
 469         heap_free(red);
 470     return ret;
 471 }
 472
 473 static BOOL xf86vm_set_gamma_ramp(struct x11drv_gamma_ramp *ramp)
 474 {
 475     WORD *red, *green, *blue;
 476     BOOL ret;
 477
 478     if (xf86vm_gammaramp_size == GAMMA_RAMP_SIZE)
 479     {
 480         red = ramp->red;
 481         green = ramp->green;
 482         blue = ramp->blue;
 483     }
 484     else
 485     {
 486         if (!(red = heap_calloc(xf86vm_gammaramp_size, 3 * sizeof(*red))))
 487             return FALSE;
 488         green = red + xf86vm_gammaramp_size;
 489         blue = green + xf86vm_gammaramp_size;
 490
 491         interpolate_gamma_ramp(red, green, blue, xf86vm_gammaramp_size,
 492                                ramp->red, ramp->green, ramp->blue, GAMMA_RAMP_SIZE);
 493     }
 494
 495     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 496     ret = pXF86VidModeSetGammaRamp(gdi_display, DefaultScreen(gdi_display),
 497                                    xf86vm_gammaramp_size, red, green, blue);
 498     if (ret) XSync( gdi_display, FALSE );
 499     if (X11DRV_check_error()) ret = FALSE;
 500
 501     if (red != ramp->red)
 502         heap_free(red);
 503     return ret;
 504 }
 505 #endif
 506
 507 static BOOL X11DRV_XF86VM_GetGammaRamp(struct x11drv_gamma_ramp *ramp)
 508 {
 509 #ifdef X_XF86VidModeSetGamma
 510   XF86VidModeGamma gamma;
 511
 512   if (xf86vm_major < 2) return FALSE; /* no gamma control */
 513 #ifdef X_XF86VidModeSetGammaRamp
 514   if (xf86vm_use_gammaramp)
 515       return xf86vm_get_gamma_ramp(ramp);
 516 #endif
 517   if (pXF86VidModeGetGamma(gdi_display, DefaultScreen(gdi_display), &gamma))
 518   {
 519       GenerateRampFromGamma(ramp->red,   gamma.red);
 520       GenerateRampFromGamma(ramp->green, gamma.green);
 521       GenerateRampFromGamma(ramp->blue,  gamma.blue);
 522       return TRUE;
 523   }
 524 #endif /* X_XF86VidModeSetGamma */
 525   return FALSE;
 526 }
 527
 528 static BOOL X11DRV_XF86VM_SetGammaRamp(struct x11drv_gamma_ramp *ramp)
 529 {
 530 #ifdef X_XF86VidModeSetGamma
 531   XF86VidModeGamma gamma;
 532
 533   if (xf86vm_major < 2 || !usexvidmode) return FALSE; /* no gamma control */
 534   if (!ComputeGammaFromRamp(ramp->red,   &gamma.red) || /* ramp validation */
 535       !ComputeGammaFromRamp(ramp->green, &gamma.green) ||
 536       !ComputeGammaFromRamp(ramp->blue,  &gamma.blue)) return FALSE;
 537 #ifdef X_XF86VidModeSetGammaRamp
 538   if (xf86vm_use_gammaramp)
 539       return xf86vm_set_gamma_ramp(ramp);
 540 #endif
 541   return pXF86VidModeSetGamma(gdi_display, DefaultScreen(gdi_display), &gamma);
 542 #else
 543   return FALSE;
 544 #endif /* X_XF86VidModeSetGamma */
 545 }
 546
 547 #else /* SONAME_LIBXXF86VM */
 548
 549 void X11DRV_XF86VM_Init(void)
 550 {
 551     TRACE("XVidMode support not compiled in.\n");
 552 }
 553
 554 #endif /* SONAME_LIBXXF86VM */
 555
 556 /***********************************************************************
 557  *              GetDeviceGammaRamp (X11DRV.@)
 558  *
 559  * FIXME: should move to somewhere appropriate, but probably not before
 560  * the stuff in graphics/x11drv/ has been moved to dlls/x11drv, so that
 561  * they can include xvidmode.h directly
 562  */
 563 BOOL CDECL X11DRV_GetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
 564 {
 565 #ifdef SONAME_LIBXXF86VM
 566   return X11DRV_XF86VM_GetGammaRamp(ramp);
 567 #else
 568   return FALSE;
 569 #endif
 570 }
 571
 572 /***********************************************************************
 573  *              SetDeviceGammaRamp (X11DRV.@)
 574  *
 575  * FIXME: should move to somewhere appropriate, but probably not before
 576  * the stuff in graphics/x11drv/ has been moved to dlls/x11drv, so that
 577  * they can include xvidmode.h directly
 578  */
 579 BOOL CDECL X11DRV_SetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
 580 {
 581 #ifdef SONAME_LIBXXF86VM
 582   return X11DRV_XF86VM_SetGammaRamp(ramp);
 583 #else
 584   return FALSE;
 585 #endif
 586 }