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 #if 0
  23 #pragma makedep unix
  24 #endif
  25
  26 #include "config.h"
  27
  28 #include <assert.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <math.h>
  32 #include <dlfcn.h>
  33
  34 #include "x11drv.h"
  35
  36 #ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
  37 #include <X11/extensions/xf86vmode.h>
  38 #endif
  39 #ifdef HAVE_X11_EXTENSIONS_XF86VMPROTO_H
  40 #include <X11/extensions/xf86vmproto.h>
  41 #endif
  42
  43 #include "windef.h"
  44 #include "wingdi.h"
  45 #include "wine/debug.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, BOOL is_primary, x11drv_settings_id *id)
  86 {
  87     /* XVidMode only supports changing the primary adapter settings.
  88      * For non-primary adapters, an id is still provided but getting
  89      * and changing non-primary adapters' settings will be ignored. */
  90     id->id = is_primary ? 1 : 0;
  91     return TRUE;
  92 }
  93
  94 static void add_xf86vm_mode(DEVMODEW *mode, DWORD depth, const XF86VidModeModeInfo *mode_info)
  95 {
  96     mode->dmSize = sizeof(*mode);
  97     mode->dmDriverExtra = sizeof(mode_info);
  98     mode->dmFields = DM_DISPLAYORIENTATION | DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFLAGS;
  99     if (mode_info->htotal && mode_info->vtotal)
 100     {
 101         mode->dmFields |= DM_DISPLAYFREQUENCY;
 102         mode->dmDisplayFrequency = mode_info->dotclock * 1000 / (mode_info->htotal * mode_info->vtotal);
 103     }
 104     mode->dmDisplayOrientation = DMDO_DEFAULT;
 105     mode->dmBitsPerPel = depth;
 106     mode->dmPelsWidth = mode_info->hdisplay;
 107     mode->dmPelsHeight = mode_info->vdisplay;
 108     mode->dmDisplayFlags = 0;
 109     memcpy((BYTE *)mode + sizeof(*mode), &mode_info, sizeof(mode_info));
 110 }
 111
 112 static BOOL xf86vm_get_modes(x11drv_settings_id id, DWORD flags, DEVMODEW **new_modes, UINT *mode_count)
 113 {
 114     INT xf86vm_mode_idx, xf86vm_mode_count;
 115     XF86VidModeModeInfo **xf86vm_modes;
 116     UINT depth_idx, mode_idx = 0;
 117     DEVMODEW *modes, *mode;
 118     SIZE_T size;
 119     BYTE *ptr;
 120     Bool ret;
 121
 122     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 123     ret = pXF86VidModeGetAllModeLines(gdi_display, DefaultScreen(gdi_display), &xf86vm_mode_count, &xf86vm_modes);
 124     if (X11DRV_check_error() || !ret || !xf86vm_mode_count)
 125         return FALSE;
 126
 127     /* Put a XF86VidModeModeInfo ** at the start to store the XF86VidMode modes pointer */
 128     size = sizeof(XF86VidModeModeInfo **);
 129     /* Display modes in different color depth, with a XF86VidModeModeInfo * at the end of each
 130      * DEVMODEW as driver private data */
 131     size += (xf86vm_mode_count * DEPTH_COUNT) * (sizeof(DEVMODEW) + sizeof(XF86VidModeModeInfo *));
 132     ptr = calloc(1, size);
 133     if (!ptr)
 134     {
 135         RtlSetLastWin32Error( ERROR_NOT_ENOUGH_MEMORY );
 136         return FALSE;
 137     }
 138
 139     memcpy(ptr, &xf86vm_modes, sizeof(xf86vm_modes));
 140     modes = (DEVMODEW *)(ptr + sizeof(xf86vm_modes));
 141
 142     for (depth_idx = 0; depth_idx < DEPTH_COUNT; ++depth_idx)
 143     {
 144         for (xf86vm_mode_idx = 0; xf86vm_mode_idx < xf86vm_mode_count; ++xf86vm_mode_idx)
 145         {
 146             mode = (DEVMODEW *)((BYTE *)modes + (sizeof(DEVMODEW) + sizeof(XF86VidModeModeInfo *)) * mode_idx++);
 147             add_xf86vm_mode(mode, depths[depth_idx], xf86vm_modes[xf86vm_mode_idx]);
 148         }
 149     }
 150
 151     *new_modes = modes;
 152     *mode_count = mode_idx;
 153     return TRUE;
 154 }
 155
 156 static void xf86vm_free_modes(DEVMODEW *modes)
 157 {
 158     XF86VidModeModeInfo **xf86vm_modes;
 159
 160     if (modes)
 161     {
 162         assert(modes[0].dmDriverExtra == sizeof(XF86VidModeModeInfo *));
 163         memcpy(&xf86vm_modes, (BYTE *)modes - sizeof(xf86vm_modes), sizeof(xf86vm_modes));
 164         XFree(xf86vm_modes);
 165     }
 166     free(modes);
 167 }
 168
 169 static BOOL xf86vm_get_current_mode(x11drv_settings_id id, DEVMODEW *mode)
 170 {
 171     XF86VidModeModeLine xf86vm_mode;
 172     INT dotclock;
 173     Bool ret;
 174
 175     mode->dmFields = DM_DISPLAYORIENTATION | DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT |
 176                      DM_DISPLAYFLAGS | DM_DISPLAYFREQUENCY | DM_POSITION;
 177     mode->dmDisplayOrientation = DMDO_DEFAULT;
 178     mode->dmDisplayFlags = 0;
 179     mode->dmPosition.x = 0;
 180     mode->dmPosition.y = 0;
 181
 182     if (id.id != 1)
 183     {
 184         FIXME("Non-primary adapters are unsupported.\n");
 185         mode->dmBitsPerPel = 0;
 186         mode->dmPelsWidth = 0;
 187         mode->dmPelsHeight = 0;
 188         mode->dmDisplayFrequency = 0;
 189         return TRUE;
 190     }
 191
 192     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 193     ret = pXF86VidModeGetModeLine(gdi_display, DefaultScreen(gdi_display), &dotclock, &xf86vm_mode);
 194     if (X11DRV_check_error() || !ret)
 195         return FALSE;
 196
 197     mode->dmBitsPerPel = screen_bpp;
 198     mode->dmPelsWidth = xf86vm_mode.hdisplay;
 199     mode->dmPelsHeight = xf86vm_mode.vdisplay;
 200     if (xf86vm_mode.htotal && xf86vm_mode.vtotal)
 201         mode->dmDisplayFrequency = dotclock * 1000 / (xf86vm_mode.htotal * xf86vm_mode.vtotal);
 202     else
 203         mode->dmDisplayFrequency = 0;
 204
 205     if (xf86vm_mode.privsize)
 206         XFree(xf86vm_mode.private);
 207     return TRUE;
 208 }
 209
 210 static LONG xf86vm_set_current_mode(x11drv_settings_id id, const DEVMODEW *mode)
 211 {
 212     XF86VidModeModeInfo *xf86vm_mode;
 213     Bool ret;
 214
 215     if (id.id != 1)
 216     {
 217         FIXME("Non-primary adapters are unsupported.\n");
 218         return DISP_CHANGE_SUCCESSFUL;
 219     }
 220
 221     if (is_detached_mode(mode))
 222     {
 223         FIXME("Detaching adapters is unsupported.\n");
 224         return DISP_CHANGE_SUCCESSFUL;
 225     }
 226
 227     if (mode->dmFields & DM_BITSPERPEL && mode->dmBitsPerPel != screen_bpp)
 228         WARN("Cannot change screen bit depth from %dbits to %dbits!\n",
 229              screen_bpp, (int)mode->dmBitsPerPel);
 230
 231     assert(mode->dmDriverExtra == sizeof(XF86VidModeModeInfo *));
 232     memcpy(&xf86vm_mode, (BYTE *)mode + sizeof(*mode), sizeof(xf86vm_mode));
 233     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 234     ret = pXF86VidModeSwitchToMode(gdi_display, DefaultScreen(gdi_display), xf86vm_mode);
 235     if (X11DRV_check_error() || !ret)
 236         return DISP_CHANGE_FAILED;
 237 #if 0 /* it is said that SetViewPort causes problems with some X servers */
 238     pXF86VidModeSetViewPort(gdi_display, DefaultScreen(gdi_display), 0, 0);
 239 #else
 240     XWarpPointer(gdi_display, None, DefaultRootWindow(gdi_display), 0, 0, 0, 0, 0, 0);
 241 #endif
 242     XFlush(gdi_display);
 243     return DISP_CHANGE_SUCCESSFUL;
 244 }
 245
 246 void X11DRV_XF86VM_Init(void)
 247 {
 248   struct x11drv_settings_handler xf86vm_handler;
 249   void *xvidmode_handle;
 250   Bool ok;
 251
 252   if (xf86vm_major) return; /* already initialized? */
 253
 254   xvidmode_handle = dlopen(SONAME_LIBXXF86VM, RTLD_NOW);
 255   if (!xvidmode_handle)
 256   {
 257     TRACE("Unable to open %s, XVidMode disabled\n", SONAME_LIBXXF86VM);
 258     usexvidmode = FALSE;
 259     return;
 260   }
 261
 262 #define LOAD_FUNCPTR(f) \
 263     if((p##f = dlsym(xvidmode_handle, #f)) == NULL) goto sym_not_found
 264     LOAD_FUNCPTR(XF86VidModeGetAllModeLines);
 265     LOAD_FUNCPTR(XF86VidModeGetModeLine);
 266     LOAD_FUNCPTR(XF86VidModeLockModeSwitch);
 267     LOAD_FUNCPTR(XF86VidModeQueryExtension);
 268     LOAD_FUNCPTR(XF86VidModeQueryVersion);
 269     LOAD_FUNCPTR(XF86VidModeSetViewPort);
 270     LOAD_FUNCPTR(XF86VidModeSwitchToMode);
 271 #ifdef X_XF86VidModeSetGamma
 272     LOAD_FUNCPTR(XF86VidModeGetGamma);
 273     LOAD_FUNCPTR(XF86VidModeSetGamma);
 274 #endif
 275 #ifdef X_XF86VidModeSetGammaRamp
 276     LOAD_FUNCPTR(XF86VidModeGetGammaRamp);
 277     LOAD_FUNCPTR(XF86VidModeGetGammaRampSize);
 278     LOAD_FUNCPTR(XF86VidModeSetGammaRamp);
 279 #endif
 280 #undef LOAD_FUNCPTR
 281
 282   /* see if XVidMode is available */
 283   if (!pXF86VidModeQueryExtension(gdi_display, &xf86vm_event, &xf86vm_error)) return;
 284
 285   X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 286   ok = pXF86VidModeQueryVersion(gdi_display, &xf86vm_major, &xf86vm_minor);
 287   if (X11DRV_check_error() || !ok) return;
 288
 289 #ifdef X_XF86VidModeSetGammaRamp
 290   if (xf86vm_major > 2 || (xf86vm_major == 2 && xf86vm_minor >= 1))
 291   {
 292       X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 293       pXF86VidModeGetGammaRampSize(gdi_display, DefaultScreen(gdi_display),
 294                                    &xf86vm_gammaramp_size);
 295       if (X11DRV_check_error()) xf86vm_gammaramp_size = 0;
 296       TRACE("Gamma ramp size %d.\n", xf86vm_gammaramp_size);
 297       if (xf86vm_gammaramp_size >= GAMMA_RAMP_SIZE)
 298           xf86vm_use_gammaramp = TRUE;
 299   }
 300 #endif /* X_XF86VidModeSetGammaRamp */
 301
 302   if (!usexvidmode)
 303     return;
 304
 305   xf86vm_handler.name = "XF86VidMode";
 306   xf86vm_handler.priority = 100;
 307   xf86vm_handler.get_id = xf86vm_get_id;
 308   xf86vm_handler.get_modes = xf86vm_get_modes;
 309   xf86vm_handler.free_modes = xf86vm_free_modes;
 310   xf86vm_handler.get_current_mode = xf86vm_get_current_mode;
 311   xf86vm_handler.set_current_mode = xf86vm_set_current_mode;
 312   X11DRV_Settings_SetHandler(&xf86vm_handler);
 313   return;
 314
 315 sym_not_found:
 316     TRACE("Unable to load function pointers from %s, XVidMode disabled\n", SONAME_LIBXXF86VM);
 317     dlclose(xvidmode_handle);
 318     xvidmode_handle = NULL;
 319     usexvidmode = FALSE;
 320 }
 321
 322 /***** GAMMA CONTROL *****/
 323 /* (only available in XF86VidMode 2.x) */
 324
 325 #ifdef X_XF86VidModeSetGamma
 326
 327 static void GenerateRampFromGamma(WORD ramp[GAMMA_RAMP_SIZE], float gamma)
 328 {
 329   float r_gamma = 1/gamma;
 330   unsigned i;
 331   TRACE("gamma is %f\n", r_gamma);
 332   for (i=0; i<GAMMA_RAMP_SIZE; i++)
 333     ramp[i] = pow(i/255.0, r_gamma) * 65535.0;
 334 }
 335
 336 static BOOL ComputeGammaFromRamp(WORD ramp[GAMMA_RAMP_SIZE], float *gamma)
 337 {
 338   float r_x, r_y, r_lx, r_ly, r_d, r_v, r_e, g_avg, g_min, g_max;
 339   unsigned i, f, l, g_n, c;
 340   f = ramp[0];
 341   l = ramp[255];
 342   if (f >= l) {
 343     ERR("inverted or flat gamma ramp (%d->%d), rejected\n", f, l);
 344     return FALSE;
 345   }
 346   r_d = l - f;
 347   g_min = g_max = g_avg = 0.0;
 348   /* check gamma ramp entries to estimate the gamma */
 349   TRACE("analyzing gamma ramp (%d->%d)\n", f, l);
 350   for (i=1, g_n=0; i<255; i++) {
 351     if (ramp[i] < f || ramp[i] > l) {
 352       ERR("strange gamma ramp ([%d]=%d for %d->%d), rejected\n", i, ramp[i], f, l);
 353       return FALSE;
 354     }
 355     c = ramp[i] - f;
 356     if (!c) continue; /* avoid log(0) */
 357
 358     /* normalize entry values into 0..1 range */
 359     r_x = i/255.0; r_y = c / r_d;
 360     /* compute logarithms of values */
 361     r_lx = log(r_x); r_ly = log(r_y);
 362     /* compute gamma for this entry */
 363     r_v = r_ly / r_lx;
 364     /* compute differential (error estimate) for this entry */
 365     /* some games use table-based logarithms that magnifies the error by 128 */
 366     r_e = -r_lx * 128 / (c * r_lx * r_lx);
 367
 368     /* compute min & max while compensating for estimated error */
 369     if (!g_n || g_min > (r_v + r_e)) g_min = r_v + r_e;
 370     if (!g_n || g_max < (r_v - r_e)) g_max = r_v - r_e;
 371
 372     /* add to average */
 373     g_avg += r_v;
 374     g_n++;
 375     /* TRACE("[%d]=%d, gamma=%f, error=%f\n", i, ramp[i], r_v, r_e); */
 376   }
 377   if (!g_n) {
 378     ERR("no gamma data, shouldn't happen\n");
 379     return FALSE;
 380   }
 381   g_avg /= g_n;
 382   TRACE("low bias is %d, high is %d, gamma is %5.3f\n", f, 65535-l, g_avg);
 383   /* the bias could be because the app wanted something like a "red shift"
 384    * like when you're hit in Quake, but XVidMode doesn't support it,
 385    * so we have to reject a significant bias */
 386   if (f && f > (pow(1/255.0, g_avg) * 65536.0)) {
 387     ERR("low-biased gamma ramp (%d), rejected\n", f);
 388     return FALSE;
 389   }
 390   /* check that the gamma is reasonably uniform across the ramp */
 391   if (g_max - g_min > 12.8) {
 392     ERR("ramp not uniform (max=%f, min=%f, avg=%f), rejected\n", g_max, g_min, g_avg);
 393     return FALSE;
 394   }
 395   /* check that the gamma is not too bright */
 396   if (g_avg < 0.2) {
 397     ERR("too bright gamma ( %5.3f), rejected\n", g_avg);
 398     return FALSE;
 399   }
 400   /* ok, now we're pretty sure we can set the desired gamma ramp,
 401    * so go for it */
 402   *gamma = 1/g_avg;
 403   return TRUE;
 404 }
 405
 406 #endif /* X_XF86VidModeSetGamma */
 407
 408 /* Hmm... should gamma control be available in desktop mode or not?
 409  * I'll assume that it should */
 410
 411 #ifdef X_XF86VidModeSetGammaRamp
 412 static void interpolate_gamma_ramp(WORD *dst_r, WORD *dst_g, WORD *dst_b, unsigned int dst_size,
 413         const WORD *src_r, const WORD *src_g, const WORD *src_b, unsigned int src_size)
 414 {
 415     double position, distance;
 416     unsigned int dst_i, src_i;
 417
 418     for (dst_i = 0; dst_i < dst_size; ++dst_i)
 419     {
 420         position = dst_i * (src_size - 1) / (double)(dst_size - 1);
 421         src_i = position;
 422
 423         if (src_i + 1 < src_size)
 424         {
 425             distance = position - src_i;
 426
 427             dst_r[dst_i] = (1.0 - distance) * src_r[src_i] + distance * src_r[src_i + 1] + 0.5;
 428             dst_g[dst_i] = (1.0 - distance) * src_g[src_i] + distance * src_g[src_i + 1] + 0.5;
 429             dst_b[dst_i] = (1.0 - distance) * src_b[src_i] + distance * src_b[src_i + 1] + 0.5;
 430         }
 431         else
 432         {
 433             dst_r[dst_i] = src_r[src_i];
 434             dst_g[dst_i] = src_g[src_i];
 435             dst_b[dst_i] = src_b[src_i];
 436         }
 437     }
 438 }
 439
 440 static BOOL xf86vm_get_gamma_ramp(struct x11drv_gamma_ramp *ramp)
 441 {
 442     WORD *red, *green, *blue;
 443     BOOL ret;
 444
 445     if (xf86vm_gammaramp_size == GAMMA_RAMP_SIZE)
 446     {
 447         red = ramp->red;
 448         green = ramp->green;
 449         blue = ramp->blue;
 450     }
 451     else
 452     {
 453         if (!(red = calloc(xf86vm_gammaramp_size, 3 * sizeof(*red))))
 454             return FALSE;
 455         green = red + xf86vm_gammaramp_size;
 456         blue = green + xf86vm_gammaramp_size;
 457     }
 458
 459     ret = pXF86VidModeGetGammaRamp(gdi_display, DefaultScreen(gdi_display),
 460                                    xf86vm_gammaramp_size, red, green, blue);
 461     if (ret && red != ramp->red)
 462         interpolate_gamma_ramp(ramp->red, ramp->green, ramp->blue, GAMMA_RAMP_SIZE,
 463                                red, green, blue, xf86vm_gammaramp_size);
 464     if (red != ramp->red)
 465         free(red);
 466     return ret;
 467 }
 468
 469 static BOOL xf86vm_set_gamma_ramp(struct x11drv_gamma_ramp *ramp)
 470 {
 471     WORD *red, *green, *blue;
 472     BOOL ret;
 473
 474     if (xf86vm_gammaramp_size == GAMMA_RAMP_SIZE)
 475     {
 476         red = ramp->red;
 477         green = ramp->green;
 478         blue = ramp->blue;
 479     }
 480     else
 481     {
 482         if (!(red = calloc(xf86vm_gammaramp_size, 3 * sizeof(*red))))
 483             return FALSE;
 484         green = red + xf86vm_gammaramp_size;
 485         blue = green + xf86vm_gammaramp_size;
 486
 487         interpolate_gamma_ramp(red, green, blue, xf86vm_gammaramp_size,
 488                                ramp->red, ramp->green, ramp->blue, GAMMA_RAMP_SIZE);
 489     }
 490
 491     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 492     ret = pXF86VidModeSetGammaRamp(gdi_display, DefaultScreen(gdi_display),
 493                                    xf86vm_gammaramp_size, red, green, blue);
 494     if (ret) XSync( gdi_display, FALSE );
 495     if (X11DRV_check_error()) ret = FALSE;
 496
 497     if (red != ramp->red)
 498         free(red);
 499     return ret;
 500 }
 501 #endif
 502
 503 static BOOL X11DRV_XF86VM_GetGammaRamp(struct x11drv_gamma_ramp *ramp)
 504 {
 505 #ifdef X_XF86VidModeSetGamma
 506   XF86VidModeGamma gamma;
 507
 508   if (xf86vm_major < 2) return FALSE; /* no gamma control */
 509 #ifdef X_XF86VidModeSetGammaRamp
 510   if (xf86vm_use_gammaramp)
 511       return xf86vm_get_gamma_ramp(ramp);
 512 #endif
 513   if (pXF86VidModeGetGamma(gdi_display, DefaultScreen(gdi_display), &gamma))
 514   {
 515       GenerateRampFromGamma(ramp->red,   gamma.red);
 516       GenerateRampFromGamma(ramp->green, gamma.green);
 517       GenerateRampFromGamma(ramp->blue,  gamma.blue);
 518       return TRUE;
 519   }
 520 #endif /* X_XF86VidModeSetGamma */
 521   return FALSE;
 522 }
 523
 524 static BOOL X11DRV_XF86VM_SetGammaRamp(struct x11drv_gamma_ramp *ramp)
 525 {
 526 #ifdef X_XF86VidModeSetGamma
 527   XF86VidModeGamma gamma;
 528
 529   if (xf86vm_major < 2 || !usexvidmode) return FALSE; /* no gamma control */
 530   if (!ComputeGammaFromRamp(ramp->red,   &gamma.red) || /* ramp validation */
 531       !ComputeGammaFromRamp(ramp->green, &gamma.green) ||
 532       !ComputeGammaFromRamp(ramp->blue,  &gamma.blue)) return FALSE;
 533 #ifdef X_XF86VidModeSetGammaRamp
 534   if (xf86vm_use_gammaramp)
 535       return xf86vm_set_gamma_ramp(ramp);
 536 #endif
 537   return pXF86VidModeSetGamma(gdi_display, DefaultScreen(gdi_display), &gamma);
 538 #else
 539   return FALSE;
 540 #endif /* X_XF86VidModeSetGamma */
 541 }
 542
 543 #else /* SONAME_LIBXXF86VM */
 544
 545 void X11DRV_XF86VM_Init(void)
 546 {
 547     TRACE("XVidMode support not compiled in.\n");
 548 }
 549
 550 #endif /* SONAME_LIBXXF86VM */
 551
 552 /***********************************************************************
 553  *              GetDeviceGammaRamp
 554  */
 555 BOOL X11DRV_GetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
 556 {
 557 #ifdef SONAME_LIBXXF86VM
 558   return X11DRV_XF86VM_GetGammaRamp(ramp);
 559 #else
 560   return FALSE;
 561 #endif
 562 }
 563
 564 /***********************************************************************
 565  *              SetDeviceGammaRamp
 566  */
 567 BOOL X11DRV_SetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
 568 {
 569 #ifdef SONAME_LIBXXF86VM
 570   return X11DRV_XF86VM_SetGammaRamp(ramp);
 571 #else
 572   return FALSE;
 573 #endif
 574 }