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 #include "wine/port.h"
  24
  25 #include <assert.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <math.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 #include "wine/unicode.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(xvidmode);
  49
  50 #ifdef SONAME_LIBXXF86VM
  51
  52 extern BOOL usexvidmode;
  53
  54 static int xf86vm_event, xf86vm_error, xf86vm_major, xf86vm_minor;
  55
  56 #ifdef X_XF86VidModeSetGammaRamp
  57 static int xf86vm_gammaramp_size;
  58 static BOOL xf86vm_use_gammaramp;
  59 #endif /* X_XF86VidModeSetGammaRamp */
  60
  61 #define MAKE_FUNCPTR(f) static typeof(f) * p##f;
  62 MAKE_FUNCPTR(XF86VidModeGetAllModeLines)
  63 MAKE_FUNCPTR(XF86VidModeGetModeLine)
  64 MAKE_FUNCPTR(XF86VidModeLockModeSwitch)
  65 MAKE_FUNCPTR(XF86VidModeQueryExtension)
  66 MAKE_FUNCPTR(XF86VidModeQueryVersion)
  67 MAKE_FUNCPTR(XF86VidModeSetViewPort)
  68 MAKE_FUNCPTR(XF86VidModeSwitchToMode)
  69 #ifdef X_XF86VidModeSetGamma
  70 MAKE_FUNCPTR(XF86VidModeGetGamma)
  71 MAKE_FUNCPTR(XF86VidModeSetGamma)
  72 #endif
  73 #ifdef X_XF86VidModeSetGammaRamp
  74 MAKE_FUNCPTR(XF86VidModeGetGammaRamp)
  75 MAKE_FUNCPTR(XF86VidModeGetGammaRampSize)
  76 MAKE_FUNCPTR(XF86VidModeSetGammaRamp)
  77 #endif
  78 #undef MAKE_FUNCPTR
  79
  80 static int XVidModeErrorHandler(Display *dpy, XErrorEvent *event, void *arg)
  81 {
  82     return 1;
  83 }
  84
  85 /* XF86VidMode display settings handler */
  86 static BOOL xf86vm_get_id(const WCHAR *device_name, ULONG_PTR *id)
  87 {
  88     WCHAR primary_adapter[CCHDEVICENAME];
  89
  90     if (!get_primary_adapter( primary_adapter ))
  91         return FALSE;
  92
  93     /* XVidMode only supports changing the primary adapter settings.
  94      * For non-primary adapters, an id is still provided but getting
  95      * and changing non-primary adapters' settings will be ignored. */
  96     *id = !lstrcmpiW( device_name, primary_adapter ) ? 1 : 0;
  97     return TRUE;
  98 }
  99
 100 static void add_xf86vm_mode(DEVMODEW *mode, DWORD depth, const XF86VidModeModeInfo *mode_info)
 101 {
 102     mode->dmSize = sizeof(*mode);
 103     mode->dmDriverExtra = sizeof(mode_info);
 104     mode->dmFields = DM_DISPLAYORIENTATION | DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFLAGS;
 105     if (mode_info->htotal && mode_info->vtotal)
 106     {
 107         mode->dmFields |= DM_DISPLAYFREQUENCY;
 108         mode->dmDisplayFrequency = mode_info->dotclock * 1000 / (mode_info->htotal * mode_info->vtotal);
 109     }
 110     mode->u1.s2.dmDisplayOrientation = DMDO_DEFAULT;
 111     mode->dmBitsPerPel = depth;
 112     mode->dmPelsWidth = mode_info->hdisplay;
 113     mode->dmPelsHeight = mode_info->vdisplay;
 114     mode->u2.dmDisplayFlags = 0;
 115     memcpy((BYTE *)mode + sizeof(*mode), &mode_info, sizeof(mode_info));
 116 }
 117
 118 static BOOL xf86vm_get_modes(ULONG_PTR id, DWORD flags, DEVMODEW **new_modes, UINT *mode_count)
 119 {
 120     INT xf86vm_mode_idx, xf86vm_mode_count;
 121     XF86VidModeModeInfo **xf86vm_modes;
 122     UINT depth_idx, mode_idx = 0;
 123     DEVMODEW *modes, *mode;
 124     SIZE_T size;
 125     BYTE *ptr;
 126     Bool ret;
 127
 128     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 129     ret = pXF86VidModeGetAllModeLines(gdi_display, DefaultScreen(gdi_display), &xf86vm_mode_count, &xf86vm_modes);
 130     if (X11DRV_check_error() || !ret || !xf86vm_mode_count)
 131         return FALSE;
 132
 133     /* Put a XF86VidModeModeInfo ** at the start to store the XF86VidMode modes pointer */
 134     size = sizeof(XF86VidModeModeInfo **);
 135     /* Display modes in different color depth, with a XF86VidModeModeInfo * at the end of each
 136      * DEVMODEW as driver private data */
 137     size += (xf86vm_mode_count * DEPTH_COUNT) * (sizeof(DEVMODEW) + sizeof(XF86VidModeModeInfo *));
 138     ptr = heap_alloc_zero(size);
 139     if (!ptr)
 140     {
 141         SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 142         return FALSE;
 143     }
 144
 145     memcpy(ptr, &xf86vm_modes, sizeof(xf86vm_modes));
 146     modes = (DEVMODEW *)(ptr + sizeof(xf86vm_modes));
 147
 148     for (depth_idx = 0; depth_idx < DEPTH_COUNT; ++depth_idx)
 149     {
 150         for (xf86vm_mode_idx = 0; xf86vm_mode_idx < xf86vm_mode_count; ++xf86vm_mode_idx)
 151         {
 152             mode = (DEVMODEW *)((BYTE *)modes + (sizeof(DEVMODEW) + sizeof(XF86VidModeModeInfo *)) * mode_idx++);
 153             add_xf86vm_mode(mode, depths[depth_idx], xf86vm_modes[xf86vm_mode_idx]);
 154         }
 155     }
 156
 157     *new_modes = modes;
 158     *mode_count = mode_idx;
 159     return TRUE;
 160 }
 161
 162 static void xf86vm_free_modes(DEVMODEW *modes)
 163 {
 164     XF86VidModeModeInfo **xf86vm_modes;
 165
 166     if (modes)
 167     {
 168         assert(modes[0].dmDriverExtra == sizeof(XF86VidModeModeInfo *));
 169         memcpy(&xf86vm_modes, (BYTE *)modes - sizeof(xf86vm_modes), sizeof(xf86vm_modes));
 170         XFree(xf86vm_modes);
 171     }
 172     heap_free(modes);
 173 }
 174
 175 static BOOL xf86vm_get_current_mode(ULONG_PTR id, DEVMODEW *mode)
 176 {
 177     XF86VidModeModeLine xf86vm_mode;
 178     INT dotclock;
 179     Bool ret;
 180
 181     mode->dmFields = DM_DISPLAYORIENTATION | DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT |
 182                      DM_DISPLAYFLAGS | DM_DISPLAYFREQUENCY | DM_POSITION;
 183     mode->u1.s2.dmDisplayOrientation = DMDO_DEFAULT;
 184     mode->u2.dmDisplayFlags = 0;
 185     mode->u1.s2.dmPosition.x = 0;
 186     mode->u1.s2.dmPosition.y = 0;
 187
 188     if (id != 1)
 189     {
 190         FIXME("Non-primary adapters are unsupported.\n");
 191         mode->dmBitsPerPel = 0;
 192         mode->dmPelsWidth = 0;
 193         mode->dmPelsHeight = 0;
 194         mode->dmDisplayFrequency = 0;
 195         return TRUE;
 196     }
 197
 198     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 199     ret = pXF86VidModeGetModeLine(gdi_display, DefaultScreen(gdi_display), &dotclock, &xf86vm_mode);
 200     if (X11DRV_check_error() || !ret)
 201         return FALSE;
 202
 203     mode->dmBitsPerPel = screen_bpp;
 204     mode->dmPelsWidth = xf86vm_mode.hdisplay;
 205     mode->dmPelsHeight = xf86vm_mode.vdisplay;
 206     if (xf86vm_mode.htotal && xf86vm_mode.vtotal)
 207         mode->dmDisplayFrequency = dotclock * 1000 / (xf86vm_mode.htotal * xf86vm_mode.vtotal);
 208     else
 209         mode->dmDisplayFrequency = 0;
 210
 211     if (xf86vm_mode.privsize)
 212         XFree(xf86vm_mode.private);
 213     return TRUE;
 214 }
 215
 216 static LONG xf86vm_set_current_mode(ULONG_PTR id, DEVMODEW *mode)
 217 {
 218     XF86VidModeModeInfo *xf86vm_mode;
 219     Bool ret;
 220
 221     if (id != 1)
 222     {
 223         FIXME("Non-primary adapters are unsupported.\n");
 224         return DISP_CHANGE_SUCCESSFUL;
 225     }
 226
 227     if (is_detached_mode(mode))
 228     {
 229         FIXME("Detaching adapters is unsupported.\n");
 230         return DISP_CHANGE_SUCCESSFUL;
 231     }
 232
 233     if (mode->dmFields & DM_BITSPERPEL && mode->dmBitsPerPel != screen_bpp)
 234         WARN("Cannot change screen bit depth from %dbits to %dbits!\n", screen_bpp, mode->dmBitsPerPel);
 235
 236     assert(mode->dmDriverExtra == sizeof(XF86VidModeModeInfo *));
 237     memcpy(&xf86vm_mode, (BYTE *)mode + sizeof(*mode), sizeof(xf86vm_mode));
 238     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 239     ret = pXF86VidModeSwitchToMode(gdi_display, DefaultScreen(gdi_display), xf86vm_mode);
 240     if (X11DRV_check_error() || !ret)
 241         return DISP_CHANGE_FAILED;
 242 #if 0 /* it is said that SetViewPort causes problems with some X servers */
 243     pXF86VidModeSetViewPort(gdi_display, DefaultScreen(gdi_display), 0, 0);
 244 #else
 245     XWarpPointer(gdi_display, None, DefaultRootWindow(gdi_display), 0, 0, 0, 0, 0, 0);
 246 #endif
 247     XFlush(gdi_display);
 248     return DISP_CHANGE_SUCCESSFUL;
 249 }
 250
 251 void X11DRV_XF86VM_Init(void)
 252 {
 253   struct x11drv_settings_handler xf86vm_handler;
 254   void *xvidmode_handle;
 255   Bool ok;
 256
 257   if (xf86vm_major) return; /* already initialized? */
 258
 259   xvidmode_handle = dlopen(SONAME_LIBXXF86VM, RTLD_NOW);
 260   if (!xvidmode_handle)
 261   {
 262     TRACE("Unable to open %s, XVidMode disabled\n", SONAME_LIBXXF86VM);
 263     usexvidmode = FALSE;
 264     return;
 265   }
 266
 267 #define LOAD_FUNCPTR(f) \
 268     if((p##f = dlsym(xvidmode_handle, #f)) == NULL) goto sym_not_found
 269     LOAD_FUNCPTR(XF86VidModeGetAllModeLines);
 270     LOAD_FUNCPTR(XF86VidModeGetModeLine);
 271     LOAD_FUNCPTR(XF86VidModeLockModeSwitch);
 272     LOAD_FUNCPTR(XF86VidModeQueryExtension);
 273     LOAD_FUNCPTR(XF86VidModeQueryVersion);
 274     LOAD_FUNCPTR(XF86VidModeSetViewPort);
 275     LOAD_FUNCPTR(XF86VidModeSwitchToMode);
 276 #ifdef X_XF86VidModeSetGamma
 277     LOAD_FUNCPTR(XF86VidModeGetGamma);
 278     LOAD_FUNCPTR(XF86VidModeSetGamma);
 279 #endif
 280 #ifdef X_XF86VidModeSetGammaRamp
 281     LOAD_FUNCPTR(XF86VidModeGetGammaRamp);
 282     LOAD_FUNCPTR(XF86VidModeGetGammaRampSize);
 283     LOAD_FUNCPTR(XF86VidModeSetGammaRamp);
 284 #endif
 285 #undef LOAD_FUNCPTR
 286
 287   /* see if XVidMode is available */
 288   if (!pXF86VidModeQueryExtension(gdi_display, &xf86vm_event, &xf86vm_error)) return;
 289
 290   X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 291   ok = pXF86VidModeQueryVersion(gdi_display, &xf86vm_major, &xf86vm_minor);
 292   if (X11DRV_check_error() || !ok) return;
 293
 294 #ifdef X_XF86VidModeSetGammaRamp
 295   if (xf86vm_major > 2 || (xf86vm_major == 2 && xf86vm_minor >= 1))
 296   {
 297       X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 298       pXF86VidModeGetGammaRampSize(gdi_display, DefaultScreen(gdi_display),
 299                                    &xf86vm_gammaramp_size);
 300       if (X11DRV_check_error()) xf86vm_gammaramp_size = 0;
 301       TRACE("Gamma ramp size %d.\n", xf86vm_gammaramp_size);
 302       if (xf86vm_gammaramp_size >= GAMMA_RAMP_SIZE)
 303           xf86vm_use_gammaramp = TRUE;
 304   }
 305 #endif /* X_XF86VidModeSetGammaRamp */
 306
 307   if (!usexvidmode)
 308     return;
 309
 310   xf86vm_handler.name = "XF86VidMode";
 311   xf86vm_handler.priority = 100;
 312   xf86vm_handler.get_id = xf86vm_get_id;
 313   xf86vm_handler.get_modes = xf86vm_get_modes;
 314   xf86vm_handler.free_modes = xf86vm_free_modes;
 315   xf86vm_handler.get_current_mode = xf86vm_get_current_mode;
 316   xf86vm_handler.set_current_mode = xf86vm_set_current_mode;
 317   X11DRV_Settings_SetHandler(&xf86vm_handler);
 318   return;
 319
 320 sym_not_found:
 321     TRACE("Unable to load function pointers from %s, XVidMode disabled\n", SONAME_LIBXXF86VM);
 322     dlclose(xvidmode_handle);
 323     xvidmode_handle = NULL;
 324     usexvidmode = FALSE;
 325 }
 326
 327 /***** GAMMA CONTROL *****/
 328 /* (only available in XF86VidMode 2.x) */
 329
 330 #ifdef X_XF86VidModeSetGamma
 331
 332 static void GenerateRampFromGamma(WORD ramp[GAMMA_RAMP_SIZE], float gamma)
 333 {
 334   float r_gamma = 1/gamma;
 335   unsigned i;
 336   TRACE("gamma is %f\n", r_gamma);
 337   for (i=0; i<GAMMA_RAMP_SIZE; i++)
 338     ramp[i] = pow(i/255.0, r_gamma) * 65535.0;
 339 }
 340
 341 static BOOL ComputeGammaFromRamp(WORD ramp[GAMMA_RAMP_SIZE], float *gamma)
 342 {
 343   float r_x, r_y, r_lx, r_ly, r_d, r_v, r_e, g_avg, g_min, g_max;
 344   unsigned i, f, l, g_n, c;
 345   f = ramp[0];
 346   l = ramp[255];
 347   if (f >= l) {
 348     ERR("inverted or flat gamma ramp (%d->%d), rejected\n", f, l);
 349     return FALSE;
 350   }
 351   r_d = l - f;
 352   g_min = g_max = g_avg = 0.0;
 353   /* check gamma ramp entries to estimate the gamma */
 354   TRACE("analyzing gamma ramp (%d->%d)\n", f, l);
 355   for (i=1, g_n=0; i<255; i++) {
 356     if (ramp[i] < f || ramp[i] > l) {
 357       ERR("strange gamma ramp ([%d]=%d for %d->%d), rejected\n", i, ramp[i], f, l);
 358       return FALSE;
 359     }
 360     c = ramp[i] - f;
 361     if (!c) continue; /* avoid log(0) */
 362
 363     /* normalize entry values into 0..1 range */
 364     r_x = i/255.0; r_y = c / r_d;
 365     /* compute logarithms of values */
 366     r_lx = log(r_x); r_ly = log(r_y);
 367     /* compute gamma for this entry */
 368     r_v = r_ly / r_lx;
 369     /* compute differential (error estimate) for this entry */
 370     /* some games use table-based logarithms that magnifies the error by 128 */
 371     r_e = -r_lx * 128 / (c * r_lx * r_lx);
 372
 373     /* compute min & max while compensating for estimated error */
 374     if (!g_n || g_min > (r_v + r_e)) g_min = r_v + r_e;
 375     if (!g_n || g_max < (r_v - r_e)) g_max = r_v - r_e;
 376
 377     /* add to average */
 378     g_avg += r_v;
 379     g_n++;
 380     /* TRACE("[%d]=%d, gamma=%f, error=%f\n", i, ramp[i], r_v, r_e); */
 381   }
 382   if (!g_n) {
 383     ERR("no gamma data, shouldn't happen\n");
 384     return FALSE;
 385   }
 386   g_avg /= g_n;
 387   TRACE("low bias is %d, high is %d, gamma is %5.3f\n", f, 65535-l, g_avg);
 388   /* the bias could be because the app wanted something like a "red shift"
 389    * like when you're hit in Quake, but XVidMode doesn't support it,
 390    * so we have to reject a significant bias */
 391   if (f && f > (pow(1/255.0, g_avg) * 65536.0)) {
 392     ERR("low-biased gamma ramp (%d), rejected\n", f);
 393     return FALSE;
 394   }
 395   /* check that the gamma is reasonably uniform across the ramp */
 396   if (g_max - g_min > 12.8) {
 397     ERR("ramp not uniform (max=%f, min=%f, avg=%f), rejected\n", g_max, g_min, g_avg);
 398     return FALSE;
 399   }
 400   /* check that the gamma is not too bright */
 401   if (g_avg < 0.2) {
 402     ERR("too bright gamma ( %5.3f), rejected\n", g_avg);
 403     return FALSE;
 404   }
 405   /* ok, now we're pretty sure we can set the desired gamma ramp,
 406    * so go for it */
 407   *gamma = 1/g_avg;
 408   return TRUE;
 409 }
 410
 411 #endif /* X_XF86VidModeSetGamma */
 412
 413 /* Hmm... should gamma control be available in desktop mode or not?
 414  * I'll assume that it should */
 415
 416 #ifdef X_XF86VidModeSetGammaRamp
 417 static void interpolate_gamma_ramp(WORD *dst_r, WORD *dst_g, WORD *dst_b, unsigned int dst_size,
 418         const WORD *src_r, const WORD *src_g, const WORD *src_b, unsigned int src_size)
 419 {
 420     double position, distance;
 421     unsigned int dst_i, src_i;
 422
 423     for (dst_i = 0; dst_i < dst_size; ++dst_i)
 424     {
 425         position = dst_i * (src_size - 1) / (double)(dst_size - 1);
 426         src_i = position;
 427
 428         if (src_i + 1 < src_size)
 429         {
 430             distance = position - src_i;
 431
 432             dst_r[dst_i] = (1.0 - distance) * src_r[src_i] + distance * src_r[src_i + 1] + 0.5;
 433             dst_g[dst_i] = (1.0 - distance) * src_g[src_i] + distance * src_g[src_i + 1] + 0.5;
 434             dst_b[dst_i] = (1.0 - distance) * src_b[src_i] + distance * src_b[src_i + 1] + 0.5;
 435         }
 436         else
 437         {
 438             dst_r[dst_i] = src_r[src_i];
 439             dst_g[dst_i] = src_g[src_i];
 440             dst_b[dst_i] = src_b[src_i];
 441         }
 442     }
 443 }
 444
 445 static BOOL xf86vm_get_gamma_ramp(struct x11drv_gamma_ramp *ramp)
 446 {
 447     WORD *red, *green, *blue;
 448     BOOL ret;
 449
 450     if (xf86vm_gammaramp_size == GAMMA_RAMP_SIZE)
 451     {
 452         red = ramp->red;
 453         green = ramp->green;
 454         blue = ramp->blue;
 455     }
 456     else
 457     {
 458         if (!(red = heap_calloc(xf86vm_gammaramp_size, 3 * sizeof(*red))))
 459             return FALSE;
 460         green = red + xf86vm_gammaramp_size;
 461         blue = green + xf86vm_gammaramp_size;
 462     }
 463
 464     ret = pXF86VidModeGetGammaRamp(gdi_display, DefaultScreen(gdi_display),
 465                                    xf86vm_gammaramp_size, red, green, blue);
 466     if (ret && red != ramp->red)
 467         interpolate_gamma_ramp(ramp->red, ramp->green, ramp->blue, GAMMA_RAMP_SIZE,
 468                                red, green, blue, xf86vm_gammaramp_size);
 469     if (red != ramp->red)
 470         heap_free(red);
 471     return ret;
 472 }
 473
 474 static BOOL xf86vm_set_gamma_ramp(struct x11drv_gamma_ramp *ramp)
 475 {
 476     WORD *red, *green, *blue;
 477     BOOL ret;
 478
 479     if (xf86vm_gammaramp_size == GAMMA_RAMP_SIZE)
 480     {
 481         red = ramp->red;
 482         green = ramp->green;
 483         blue = ramp->blue;
 484     }
 485     else
 486     {
 487         if (!(red = heap_calloc(xf86vm_gammaramp_size, 3 * sizeof(*red))))
 488             return FALSE;
 489         green = red + xf86vm_gammaramp_size;
 490         blue = green + xf86vm_gammaramp_size;
 491
 492         interpolate_gamma_ramp(red, green, blue, xf86vm_gammaramp_size,
 493                                ramp->red, ramp->green, ramp->blue, GAMMA_RAMP_SIZE);
 494     }
 495
 496     X11DRV_expect_error(gdi_display, XVidModeErrorHandler, NULL);
 497     ret = pXF86VidModeSetGammaRamp(gdi_display, DefaultScreen(gdi_display),
 498                                    xf86vm_gammaramp_size, red, green, blue);
 499     if (ret) XSync( gdi_display, FALSE );
 500     if (X11DRV_check_error()) ret = FALSE;
 501
 502     if (red != ramp->red)
 503         heap_free(red);
 504     return ret;
 505 }
 506 #endif
 507
 508 static BOOL X11DRV_XF86VM_GetGammaRamp(struct x11drv_gamma_ramp *ramp)
 509 {
 510 #ifdef X_XF86VidModeSetGamma
 511   XF86VidModeGamma gamma;
 512
 513   if (xf86vm_major < 2) return FALSE; /* no gamma control */
 514 #ifdef X_XF86VidModeSetGammaRamp
 515   if (xf86vm_use_gammaramp)
 516       return xf86vm_get_gamma_ramp(ramp);
 517 #endif
 518   if (pXF86VidModeGetGamma(gdi_display, DefaultScreen(gdi_display), &gamma))
 519   {
 520       GenerateRampFromGamma(ramp->red,   gamma.red);
 521       GenerateRampFromGamma(ramp->green, gamma.green);
 522       GenerateRampFromGamma(ramp->blue,  gamma.blue);
 523       return TRUE;
 524   }
 525 #endif /* X_XF86VidModeSetGamma */
 526   return FALSE;
 527 }
 528
 529 static BOOL X11DRV_XF86VM_SetGammaRamp(struct x11drv_gamma_ramp *ramp)
 530 {
 531 #ifdef X_XF86VidModeSetGamma
 532   XF86VidModeGamma gamma;
 533
 534   if (xf86vm_major < 2 || !usexvidmode) return FALSE; /* no gamma control */
 535   if (!ComputeGammaFromRamp(ramp->red,   &gamma.red) || /* ramp validation */
 536       !ComputeGammaFromRamp(ramp->green, &gamma.green) ||
 537       !ComputeGammaFromRamp(ramp->blue,  &gamma.blue)) return FALSE;
 538 #ifdef X_XF86VidModeSetGammaRamp
 539   if (xf86vm_use_gammaramp)
 540       return xf86vm_set_gamma_ramp(ramp);
 541 #endif
 542   return pXF86VidModeSetGamma(gdi_display, DefaultScreen(gdi_display), &gamma);
 543 #else
 544   return FALSE;
 545 #endif /* X_XF86VidModeSetGamma */
 546 }
 547
 548 #else /* SONAME_LIBXXF86VM */
 549
 550 void X11DRV_XF86VM_Init(void)
 551 {
 552     TRACE("XVidMode support not compiled in.\n");
 553 }
 554
 555 #endif /* SONAME_LIBXXF86VM */
 556
 557 /***********************************************************************
 558  *              GetDeviceGammaRamp (X11DRV.@)
 559  *
 560  * FIXME: should move to somewhere appropriate, but probably not before
 561  * the stuff in graphics/x11drv/ has been moved to dlls/x11drv, so that
 562  * they can include xvidmode.h directly
 563  */
 564 BOOL CDECL X11DRV_GetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
 565 {
 566 #ifdef SONAME_LIBXXF86VM
 567   return X11DRV_XF86VM_GetGammaRamp(ramp);
 568 #else
 569   return FALSE;
 570 #endif
 571 }
 572
 573 /***********************************************************************
 574  *              SetDeviceGammaRamp (X11DRV.@)
 575  *
 576  * FIXME: should move to somewhere appropriate, but probably not before
 577  * the stuff in graphics/x11drv/ has been moved to dlls/x11drv, so that
 578  * they can include xvidmode.h directly
 579  */
 580 BOOL CDECL X11DRV_SetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
 581 {
 582 #ifdef SONAME_LIBXXF86VM
 583   return X11DRV_XF86VM_SetGammaRamp(ramp);
 584 #else
 585   return FALSE;
 586 #endif
 587 }