This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_x11modes.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_x11video.h"
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//#define X11MODES_DEBUG
#undef SDL_VIDEO_DRIVER_X11_XINERAMA
#undef SDL_VIDEO_DRIVER_X11_XRANDR
#undef SDL_VIDEO_DRIVER_X11_VIDMODE
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static int
get_visualinfo(Display * display, int screen, XVisualInfo * vinfo)
{
const char *visual_id = SDL_getenv("SDL_VIDEO_X11_VISUALID");
int depth;
/* Look for an exact visual, if requested */
if (visual_id) {
XVisualInfo *vi, template;
int nvis;
SDL_zero(template);
template.visualid = SDL_strtol(visual_id, NULL, 0);
vi = XGetVisualInfo(display, VisualIDMask, &template, &nvis);
if (vi) {
*vinfo = *vi;
XFree(vi);
return 0;
}
}
depth = DefaultDepth(display, screen);
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if ((X11_UseDirectColorVisuals() &&
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XMatchVisualInfo(display, screen, depth, DirectColor, vinfo)) ||
XMatchVisualInfo(display, screen, depth, TrueColor, vinfo) ||
XMatchVisualInfo(display, screen, depth, PseudoColor, vinfo) ||
XMatchVisualInfo(display, screen, depth, StaticColor, vinfo)) {
return 0;
}
return -1;
}
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X11_GetPixelFormatFromVisualInfo(Display * display, XVisualInfo * vinfo)
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{
if (vinfo->class == DirectColor || vinfo->class == TrueColor) {
int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
Rmask = vinfo->visual->red_mask;
Gmask = vinfo->visual->green_mask;
Bmask = vinfo->visual->blue_mask;
if (vinfo->depth == 32) {
Amask = (0xFFFFFFFF & ~(Rmask | Gmask | Bmask));
} else {
Amask = 0;
}
bpp = vinfo->depth;
if (bpp == 24) {
int i, n;
XPixmapFormatValues *p = XListPixmapFormats(display, &n);
if (p) {
for (i = 0; i < n; ++i) {
if (p[i].depth == 24) {
bpp = p[i].bits_per_pixel;
break;
}
}
XFree(p);
}
}
return SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
}
if (vinfo->class == PseudoColor || vinfo->class == StaticColor) {
switch (vinfo->depth) {
case 8:
return SDL_PIXELTYPE_INDEX8;
case 4:
if (BitmapBitOrder(display) == LSBFirst) {
return SDL_PIXELFORMAT_INDEX4LSB;
} else {
return SDL_PIXELFORMAT_INDEX4MSB;
}
break;
case 1:
if (BitmapBitOrder(display) == LSBFirst) {
return SDL_PIXELFORMAT_INDEX1LSB;
} else {
return SDL_PIXELFORMAT_INDEX1MSB;
}
break;
}
}
return SDL_PIXELFORMAT_UNKNOWN;
}
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void
X11_InitModes(_THIS)
{
SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
int screen;
for (screen = 0; screen < ScreenCount(data->display); ++screen) {
XVisualInfo vinfo;
SDL_VideoDisplay display;
SDL_DisplayData *displaydata;
SDL_DisplayMode mode;
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XPixmapFormatValues *pixmapFormats;
int i, n;
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if (get_visualinfo(data->display, screen, &vinfo) < 0) {
continue;
}
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mode.format = X11_GetPixelFormatFromVisualInfo(data->display, &vinfo);
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mode.w = DisplayWidth(data->display, screen);
mode.h = DisplayHeight(data->display, screen);
mode.refresh_rate = 0;
mode.driverdata = NULL;
displaydata = (SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
if (!displaydata) {
continue;
}
displaydata->screen = screen;
displaydata->visual = vinfo.visual;
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displaydata->depth = vinfo.depth;
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displaydata->scanline_pad = SDL_BYTESPERPIXEL(mode.format) * 8;
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pixmapFormats = XListPixmapFormats(data->display, &n);
if (pixmapFormats) {
for (i = 0; i < n; ++i) {
if (pixmapFormats[i].depth == displaydata->depth) {
displaydata->scanline_pad = pixmapFormats[i].scanline_pad;
break;
}
}
XFree(pixmapFormats);
}
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SDL_zero(display);
display.desktop_mode = mode;
display.current_mode = mode;
display.driverdata = displaydata;
SDL_AddVideoDisplay(&display);
}
}
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/* Global for the error handler */
int vm_event, vm_error = -1;
#if SDL_VIDEO_DRIVER_X11_XINERAMA
static SDL_bool
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CheckXinerama(Display * display, int *major, int *minor)
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{
const char *env;
/* Default the extension not available */
*major = *minor = 0;
/* Allow environment override */
env = getenv("SDL_VIDEO_X11_XINERAMA");
if (env && !SDL_atoi(env)) {
return SDL_FALSE;
}
/* Query the extension version */
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if (!SDL_NAME(XineramaQueryExtension) (display, major, minor) ||
!SDL_NAME(XineramaIsActive) (display)) {
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return SDL_FALSE;
}
return SDL_TRUE;
}
#endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
#if SDL_VIDEO_DRIVER_X11_XRANDR
static SDL_bool
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CheckXRandR(Display * display, int *major, int *minor)
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{
const char *env;
/* Default the extension not available */
*major = *minor = 0;
/* Allow environment override */
env = getenv("SDL_VIDEO_X11_XRANDR");
if (env && !SDL_atoi(env)) {
return SDL_FALSE;
}
if (!SDL_X11_HAVE_XRANDR) {
return SDL_FALSE;
}
/* Query the extension version */
if (!XRRQueryVersion(display, major, minor)) {
return SDL_FALSE;
}
return SDL_TRUE;
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
#if SDL_VIDEO_DRIVER_X11_VIDMODE
static SDL_bool
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CheckVidMode(Display * display, int *major, int *minor)
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{
const char *env;
/* Default the extension not available */
*major = *minor = 0;
/* Allow environment override */
env = getenv("SDL_VIDEO_X11_VIDMODE");
if (env && !SDL_atoi(env)) {
return SDL_FALSE;
}
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/* Query the extension version */
vm_error = -1;
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if (!SDL_NAME(XF86VidModeQueryExtension) (display, &vm_event, &vm_error)
|| !SDL_NAME(XF86VidModeQueryVersion) (display, major, minor)) {
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return SDL_FALSE;
}
return SDL_TRUE;
}
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Bool SDL_NAME(XF86VidModeGetModeInfo) (Display * dpy, int scr,
SDL_NAME(XF86VidModeModeInfo) * info)
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{
Bool retval;
int dotclock;
SDL_NAME(XF86VidModeModeLine) l;
SDL_zerop(info);
SDL_zero(l);
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retval = SDL_NAME(XF86VidModeGetModeLine) (dpy, scr, &dotclock, &l);
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info->dotclock = dotclock;
info->hdisplay = l.hdisplay;
info->hsyncstart = l.hsyncstart;
info->hsyncend = l.hsyncend;
info->htotal = l.htotal;
info->hskew = l.hskew;
info->vdisplay = l.vdisplay;
info->vsyncstart = l.vsyncstart;
info->vsyncend = l.vsyncend;
info->vtotal = l.vtotal;
info->flags = l.flags;
info->privsize = l.privsize;
info->private = l.private;
return retval;
}
static int
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calculate_rate(SDL_NAME(XF86VidModeModeInfo) * info)
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return (info->htotal
&& info->vtotal) ? (1000 * info->dotclock / (info->htotal *
info->vtotal)) : 0;
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}
static void
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save_mode(Display * display, SDL_DisplayData * data)
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SDL_NAME(XF86VidModeGetModeInfo) (display, data->screen,
&data->saved_mode);
SDL_NAME(XF86VidModeGetViewPort) (display, data->screen,
&data->saved_view.x,
&data->saved_view.y);
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}
static void
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restore_mode(Display * display, SDL_DisplayData * data)
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{
SDL_NAME(XF86VidModeModeInfo) mode;
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if (SDL_NAME(XF86VidModeGetModeInfo) (display, data->screen, &mode)) {
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if (SDL_memcmp(&mode, &data->saved_mode, sizeof(mode)) != 0) {
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SDL_NAME(XF86VidModeSwitchToMode) (display, data->screen,
&data->saved_mode);
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}
}
if ((data->saved_view.x != 0) || (data->saved_view.y != 0)) {
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SDL_NAME(XF86VidModeSetViewPort) (display, data->screen,
data->saved_view.x,
data->saved_view.y);
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}
}
#endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */
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void
X11_GetDisplayModes(_THIS)
{
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Display *display = ((SDL_VideoData *) _this->driverdata)->display;
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SDL_DisplayData *data = (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;
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#if SDL_VIDEO_DRIVER_X11_XINERAMA
int xinerama_major, xinerama_minor;
int screens;
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SDL_NAME(XineramaScreenInfo) * xinerama;
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#endif
#if SDL_VIDEO_DRIVER_X11_XRANDR
int xrandr_major, xrandr_minor;
int nsizes, nrates;
XRRScreenSize *sizes;
short *rates;
#endif
#if SDL_VIDEO_DRIVER_X11_VIDMODE
int vm_major, vm_minor;
int nmodes;
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SDL_NAME(XF86VidModeModeInfo) ** modes;
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#endif
int screen_w;
int screen_h;
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SDL_DisplayMode mode;
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/* Unfortunately X11 requires the window to be created with the correct
* visual and depth ahead of time, but the SDL API allows you to create
* a window before setting the fullscreen display mode. This means that
* we have to use the same format for all windows and all display modes.
* (or support recreating the window with a new visual behind the scenes)
*/
mode.format = SDL_CurrentDisplay.current_mode.format;
mode.driverdata = NULL;
data->use_xinerama = 0;
data->use_xrandr = 0;
data->use_vidmode = 0;
screen_w = DisplayWidth(display, data->screen);
screen_h = DisplayHeight(display, data->screen);
#if SDL_VIDEO_DRIVER_X11_XINERAMA
/* Query Xinerama extention */
if (CheckXinerama(display, &xinerama_major, &xinerama_minor)) {
#ifdef X11MODES_DEBUG
printf("X11 detected Xinerama:\n");
#endif
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xinerama = SDL_NAME(XineramaQueryScreens) (display, &screens);
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if (xinerama) {
int i;
for (i = 0; i < screens; i++) {
#ifdef X11MODES_DEBUG
printf("xinerama %d: %dx%d+%d+%d\n",
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xinerama[i].screen_number,
xinerama[i].width, xinerama[i].height,
xinerama[i].x_org, xinerama[i].y_org);
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#endif
if (xinerama[i].screen_number == data->screen) {
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data->use_xinerama =
xinerama_major * 100 + xinerama_minor;
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data->xinerama_info = xinerama[i];
}
}
XFree(xinerama);
}
if (data->use_xinerama) {
/* Add the full xinerama mode */
if (screen_w > data->xinerama_info.width ||
screen_h > data->xinerama_info.height) {
mode.w = screen_w;
mode.h = screen_h;
mode.refresh_rate = 0;
SDL_AddDisplayMode(_this->current_display, &mode);
}
/* Add the head xinerama mode */
mode.w = data->xinerama_info.width;
mode.h = data->xinerama_info.height;
mode.refresh_rate = 0;
SDL_AddDisplayMode(_this->current_display, &mode);
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
#if SDL_VIDEO_DRIVER_X11_XRANDR
/* XRandR */
/* require at least XRandR v1.0 (arbitrary) */
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if (CheckXRandR(display, &xrandr_major, &xrandr_minor)
&& xrandr_major >= 1) {
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#ifdef X11MODES_DEBUG
fprintf(stderr, "XRANDR: XRRQueryVersion: V%d.%d\n",
xrandr_major, xrandr_minor);
#endif
/* save the screen configuration since we must reference it
each time we toggle modes.
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*/
data->screen_config =
XRRGetScreenInfo(display, RootWindow(display, data->screen));
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/* retrieve the list of resolution */
sizes = XRRConfigSizes(data->screen_config, &nsizes);
if (nsizes > 0) {
int i, j;
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for (i = 0; i < nsizes; i++) {
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mode.w = sizes[i].width;
mode.h = sizes[i].height;
rates = XRRConfigRates(data->screen_config, i, &nrates);
for (j = 0; j < nrates; ++j) {
mode.refresh_rate = rates[j];
#ifdef X11MODES_DEBUG
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fprintf(stderr,
"XRANDR: mode = %4d[%d], w = %4d, h = %4d, rate = %4d\n",
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i, j, mode.w, mode.h, mode.refresh_rate);
#endif
SDL_AddDisplayMode(_this->current_display, &mode);
}
}
data->use_xrandr = xrandr_major * 100 + xrandr_minor;
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data->saved_size =
XRRConfigCurrentConfiguration(data->screen_config,
&data->saved_rotation);
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data->saved_rate = XRRConfigCurrentRate(data->screen_config);
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
#if SDL_VIDEO_DRIVER_X11_VIDMODE
/* XVidMode */
if (!data->use_xrandr &&
#if SDL_VIDEO_DRIVER_X11_XINERAMA
(!data->use_xinerama || data->xinerama_info.screen_number == 0) &&
#endif
CheckVidMode(display, &vm_major, &vm_minor) &&
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SDL_NAME(XF86VidModeGetAllModeLines) (display, data->screen, &nmodes,
&modes)) {
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int i;
#ifdef X11MODES_DEBUG
printf("VidMode modes: (unsorted)\n");
for (i = 0; i < nmodes; ++i) {
printf("Mode %d: %d x %d @ %d\n", i,
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modes[i]->hdisplay, modes[i]->vdisplay,
calculate_rate(modes[i]));
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}
#endif
for (i = 0; i < nmodes; ++i) {
mode.w = modes[i]->hdisplay;
mode.h = modes[i]->vdisplay;
mode.refresh_rate = calculate_rate(modes[i]);
SDL_AddDisplayMode(_this->current_display, &mode);
}
XFree(modes);
data->use_vidmode = vm_major * 100 + vm_minor;
save_mode(display, data);
}
#endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */
if (!data->use_xrandr && !data->use_vidmode) {
mode.w = screen_w;
mode.h = screen_h;
mode.refresh_rate = 0;
SDL_AddDisplayMode(_this->current_display, &mode);
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}
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#ifdef X11MODES_DEBUG
if (data->use_xinerama) {
printf("Xinerama is enabled\n");
}
if (data->use_xrandr) {
printf("XRandR is enabled\n");
}
if (data->use_vidmode) {
printf("VidMode is enabled\n");
}
#endif /* X11MODES_DEBUG */
}
static void
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get_real_resolution(Display * display, SDL_DisplayData * data, int *w, int *h,
int *rate)
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{
#if SDL_VIDEO_DRIVER_X11_XRANDR
if (data->use_xrandr) {
int nsizes;
XRRScreenSize *sizes;
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sizes = XRRConfigSizes(data->screen_config, &nsizes);
if (nsizes > 0) {
int cur_size;
Rotation cur_rotation;
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cur_size =
XRRConfigCurrentConfiguration(data->screen_config,
&cur_rotation);
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*w = sizes[cur_size].width;
*h = sizes[cur_size].height;
*rate = XRRConfigCurrentRate(data->screen_config);
#ifdef X11MODES_DEBUG
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fprintf(stderr,
"XRANDR: get_real_resolution: w = %d, h = %d, rate = %d\n",
*w, *h, *rate);
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#endif
return;
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
#if SDL_VIDEO_DRIVER_X11_VIDMODE
if (data->use_vidmode) {
SDL_NAME(XF86VidModeModeInfo) mode;
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if (SDL_NAME(XF86VidModeGetModeInfo) (display, data->screen, &mode)) {
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*w = mode.hdisplay;
*h = mode.vdisplay;
*rate = calculate_rate(&mode);
return;
}
}
#endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */
#if SDL_VIDEO_DRIVER_X11_XINERAMA
if (data->use_xinerama) {
*w = data->xinerama_info.width;
*h = data->xinerama_info.height;
*rate = 0;
return;
}
#endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
*w = DisplayWidth(display, data->screen);
*h = DisplayHeight(display, data->screen);
*rate = 0;
}
static void
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set_best_resolution(Display * display, SDL_DisplayData * data, int w, int h,
int rate)
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{
int real_w, real_h, real_rate;
/* check current mode so we can avoid uneccessary mode changes */
get_real_resolution(display, data, &real_w, &real_h, &real_rate);
if (w == real_w && h == real_h && (!rate || rate == real_rate)) {
return;
}
#if SDL_VIDEO_DRIVER_X11_XRANDR
if (data->use_xrandr) {
#ifdef X11MODES_DEBUG
fprintf(stderr, "XRANDR: set_best_resolution(): w = %d, h = %d\n",
w, h);
#endif
int i, nsizes, nrates;
int best;
int best_rate;
XRRScreenSize *sizes;
short *rates;
/* find the smallest resolution that is at least as big as the user requested */
best = -1;
sizes = XRRConfigSizes(data->screen_config, &nsizes);
for (i = 0; i < nsizes; ++i) {
if (sizes[i].width < w || sizes[i].height < h) {
continue;
}
if (sizes[i].width == w && sizes[i].height == h) {
best = i;
break;
}
if (best == -1 ||
(sizes[i].width < sizes[best].width) ||
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(sizes[i].width == sizes[best].width
&& sizes[i].height < sizes[best].height)) {
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best = i;
}
}
if (best >= 0) {
best_rate = 0;
rates = XRRConfigRates(data->screen_config, best, &nrates);
for (i = 0; i < nrates; ++i) {
if (rates[i] == rate) {
best_rate = rate;
break;
}
if (!rate) {
/* Higher is better, right? */
if (rates[i] > best_rate) {
best_rate = rates[i];
}
} else {
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if (SDL_abs(rates[i] - rate) < SDL_abs(best_rate - rate)) {
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best_rate = rates[i];
}
}
}
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XRRSetScreenConfigAndRate(display, data->screen_config,
RootWindow(display, data->screen), best,
data->saved_rotation, best_rate,
CurrentTime);
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}
return;
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
#if SDL_VIDEO_DRIVER_X11_VIDMODE
if (data->use_vidmode) {
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SDL_NAME(XF86VidModeModeInfo) ** modes;
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int i, nmodes;
int best;
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if (SDL_NAME(XF86VidModeGetAllModeLines)
(display, data->screen, &nmodes, &modes)) {
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best = -1;
for (i = 0; i < nmodes; ++i) {
if (modes[i]->hdisplay < w || modes[i]->vdisplay < h) {
continue;
}
if (best == -1 ||
(modes[i]->hdisplay < modes[best]->hdisplay) ||
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(modes[i]->hdisplay == modes[best]->hdisplay
&& modes[i]->vdisplay < modes[best]->vdisplay)) {
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best = i;
continue;
}
if ((modes[i]->hdisplay == modes[best]->hdisplay) &&
(modes[i]->vdisplay == modes[best]->vdisplay)) {
if (!rate) {
/* Higher is better, right? */
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if (calculate_rate(modes[i]) >
calculate_rate(modes[best])) {
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best = i;
}
} else {
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if (SDL_abs(calculate_rate(modes[i]) - rate) <
SDL_abs(calculate_rate(modes[best]) - rate)) {
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best = i;
}
}
}
}
if (best >= 0) {
#ifdef X11MODES_DEBUG
printf("Best Mode %d: %d x %d @ %d\n", best,
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modes[best]->hdisplay, modes[best]->vdisplay,
calculate_rate(modes[best]));
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SDL_NAME(XF86VidModeSwitchToMode) (display, data->screen,
modes[best]);
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}
XFree(modes);
}
return;
}
#endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */
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}
int
X11_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
{
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Display *display = ((SDL_VideoData *) _this->driverdata)->display;
SDL_DisplayData *data = (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;
set_best_resolution(display, data, mode->w, mode->h, mode->refresh_rate);
return 0;
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}
void
X11_QuitModes(_THIS)
{
}
/* vi: set ts=4 sw=4 expandtab: */