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SDL/src/video/x11/SDL_x11modes.c

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/*
Simple DirectMedia Layer
Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_DRIVER_X11
#include "SDL_hints.h"
#include "SDL_x11video.h"
#include "SDL_timer.h"
#include "edid.h"
/* #define X11MODES_DEBUG */
/* I'm becoming more and more convinced that the application should never
* use XRandR, and it's the window manager's responsibility to track and
* manage display modes for fullscreen windows. Right now XRandR is completely
* broken with respect to window manager behavior on every window manager that
* I can find. For example, on Unity 3D if you show a fullscreen window while
* the resolution is changing (within ~250 ms) your window will retain the
* fullscreen state hint but be decorated and windowed.
*
* However, many people swear by it, so let them swear at it. :)
*/
/* #define XRANDR_DISABLED_BY_DEFAULT */
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 = X11_XGetVisualInfo(display, VisualIDMask, &template, &nvis);
if (vi) {
*vinfo = *vi;
X11_XFree(vi);
return 0;
}
}
depth = DefaultDepth(display, screen);
if ((X11_UseDirectColorVisuals() &&
X11_XMatchVisualInfo(display, screen, depth, DirectColor, vinfo)) ||
X11_XMatchVisualInfo(display, screen, depth, TrueColor, vinfo) ||
X11_XMatchVisualInfo(display, screen, depth, PseudoColor, vinfo) ||
X11_XMatchVisualInfo(display, screen, depth, StaticColor, vinfo)) {
return 0;
}
return -1;
}
int
X11_GetVisualInfoFromVisual(Display * display, Visual * visual, XVisualInfo * vinfo)
{
XVisualInfo *vi;
int nvis;
vinfo->visualid = X11_XVisualIDFromVisual(visual);
vi = X11_XGetVisualInfo(display, VisualIDMask, vinfo, &nvis);
if (vi) {
*vinfo = *vi;
X11_XFree(vi);
return 0;
}
return -1;
}
Uint32
X11_GetPixelFormatFromVisualInfo(Display * display, XVisualInfo * vinfo)
{
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 = X11_XListPixmapFormats(display, &n);
if (p) {
for (i = 0; i < n; ++i) {
if (p[i].depth == 24) {
bpp = p[i].bits_per_pixel;
break;
}
}
X11_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; -Wunreachable-code-break */
case 1:
if (BitmapBitOrder(display) == LSBFirst) {
return SDL_PIXELFORMAT_INDEX1LSB;
} else {
return SDL_PIXELFORMAT_INDEX1MSB;
}
/* break; -Wunreachable-code-break */
}
}
return SDL_PIXELFORMAT_UNKNOWN;
}
#if SDL_VIDEO_DRIVER_X11_XRANDR
static SDL_bool
CheckXRandR(Display * display, int *major, int *minor)
{
/* Default the extension not available */
*major = *minor = 0;
/* Allow environment override */
#ifdef XRANDR_DISABLED_BY_DEFAULT
if (!SDL_GetHintBoolean(SDL_HINT_VIDEO_X11_XRANDR, SDL_FALSE)) {
#ifdef X11MODES_DEBUG
printf("XRandR disabled by default due to window manager issues\n");
#endif
return SDL_FALSE;
}
#else
if (!SDL_GetHintBoolean(SDL_HINT_VIDEO_X11_XRANDR, SDL_TRUE)) {
#ifdef X11MODES_DEBUG
printf("XRandR disabled due to hint\n");
#endif
return SDL_FALSE;
}
#endif /* XRANDR_ENABLED_BY_DEFAULT */
if (!SDL_X11_HAVE_XRANDR) {
#ifdef X11MODES_DEBUG
printf("XRandR support not available\n");
#endif
return SDL_FALSE;
}
/* Query the extension version */
*major = 1; *minor = 3; /* we want 1.3 */
if (!X11_XRRQueryVersion(display, major, minor)) {
#ifdef X11MODES_DEBUG
printf("XRandR not active on the display\n");
#endif
*major = *minor = 0;
return SDL_FALSE;
}
#ifdef X11MODES_DEBUG
printf("XRandR available at version %d.%d!\n", *major, *minor);
#endif
return SDL_TRUE;
}
#define XRANDR_ROTATION_LEFT (1 << 1)
#define XRANDR_ROTATION_RIGHT (1 << 3)
static int
CalculateXRandRRefreshRate(const XRRModeInfo *info)
{
return (info->hTotal && info->vTotal) ?
SDL_round(((double)info->dotClock / (double)(info->hTotal * info->vTotal))) : 0;
}
static SDL_bool
SetXRandRModeInfo(Display *display, XRRScreenResources *res, RRCrtc crtc,
RRMode modeID, SDL_DisplayMode *mode)
{
int i;
for (i = 0; i < res->nmode; ++i) {
const XRRModeInfo *info = &res->modes[i];
if (info->id == modeID) {
XRRCrtcInfo *crtcinfo;
Rotation rotation = 0;
crtcinfo = X11_XRRGetCrtcInfo(display, res, crtc);
if (crtcinfo) {
rotation = crtcinfo->rotation;
X11_XRRFreeCrtcInfo(crtcinfo);
}
if (rotation & (XRANDR_ROTATION_LEFT|XRANDR_ROTATION_RIGHT)) {
mode->w = info->height;
mode->h = info->width;
} else {
mode->w = info->width;
mode->h = info->height;
}
mode->refresh_rate = CalculateXRandRRefreshRate(info);
((SDL_DisplayModeData*)mode->driverdata)->xrandr_mode = modeID;
#ifdef X11MODES_DEBUG
printf("XRandR mode %d: %dx%d@%dHz\n", (int) modeID, mode->w, mode->h, mode->refresh_rate);
#endif
return SDL_TRUE;
}
}
return SDL_FALSE;
}
static void
SetXRandRDisplayName(Display *dpy, Atom EDID, char *name, const size_t namelen, RROutput output, const unsigned long widthmm, const unsigned long heightmm)
{
/* See if we can get the EDID data for the real monitor name */
int inches;
int nprop;
Atom *props = X11_XRRListOutputProperties(dpy, output, &nprop);
int i;
for (i = 0; i < nprop; ++i) {
unsigned char *prop;
int actual_format;
unsigned long nitems, bytes_after;
Atom actual_type;
if (props[i] == EDID) {
if (X11_XRRGetOutputProperty(dpy, output, props[i], 0, 100, False,
False, AnyPropertyType, &actual_type,
&actual_format, &nitems, &bytes_after,
&prop) == Success) {
MonitorInfo *info = decode_edid(prop);
if (info) {
#ifdef X11MODES_DEBUG
printf("Found EDID data for %s\n", name);
dump_monitor_info(info);
#endif
SDL_strlcpy(name, info->dsc_product_name, namelen);
SDL_free(info);
}
X11_XFree(prop);
}
break;
}
}
if (props) {
X11_XFree(props);
}
inches = (int)((SDL_sqrtf(widthmm * widthmm + heightmm * heightmm) / 25.4f) + 0.5f);
if (*name && inches) {
const size_t len = SDL_strlen(name);
SDL_snprintf(&name[len], namelen-len, " %d\"", inches);
}
#ifdef X11MODES_DEBUG
printf("Display name: %s\n", name);
#endif
}
static int
GetXftDPI(Display* dpy)
{
char* xdefault_resource;
int xft_dpi, err;
xdefault_resource = X11_XGetDefault(dpy, "Xft", "dpi");
if(!xdefault_resource) {
return 0;
}
/*
* It's possible for SDL_atoi to call SDL_strtol, if it fails due to a
* overflow or an underflow, it will return LONG_MAX or LONG_MIN and set
* errno to ERANGE. So we need to check for this so we dont get crazy dpi
* values
*/
xft_dpi = SDL_atoi(xdefault_resource);
err = errno;
return err == ERANGE ? 0 : xft_dpi;
}
static int
X11_InitModes_XRandR(_THIS)
{
SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
Display *dpy = data->display;
const int screencount = ScreenCount(dpy);
const int default_screen = DefaultScreen(dpy);
RROutput primary = X11_XRRGetOutputPrimary(dpy, RootWindow(dpy, default_screen));
Atom EDID = X11_XInternAtom(dpy, "EDID", False);
XRRScreenResources *res = NULL;
Uint32 pixelformat;
XVisualInfo vinfo;
XPixmapFormatValues *pixmapformats;
int looking_for_primary;
int scanline_pad;
int output;
int screen, i, n;
for (looking_for_primary = 1; looking_for_primary >= 0; looking_for_primary--) {
for (screen = 0; screen < screencount; screen++) {
/* we want the primary output first, and then skipped later. */
if (looking_for_primary && (screen != default_screen)) {
continue;
}
if (get_visualinfo(dpy, screen, &vinfo) < 0) {
continue; /* uh, skip this screen? */
}
pixelformat = X11_GetPixelFormatFromVisualInfo(dpy, &vinfo);
if (SDL_ISPIXELFORMAT_INDEXED(pixelformat)) {
continue; /* Palettized video modes are no longer supported */
}
scanline_pad = SDL_BYTESPERPIXEL(pixelformat) * 8;
pixmapformats = X11_XListPixmapFormats(dpy, &n);
if (pixmapformats) {
for (i = 0; i < n; ++i) {
if (pixmapformats[i].depth == vinfo.depth) {
scanline_pad = pixmapformats[i].scanline_pad;
break;
}
}
X11_XFree(pixmapformats);
}
res = X11_XRRGetScreenResourcesCurrent(dpy, RootWindow(dpy, screen));
if (!res || res->noutput == 0) {
if (res) {
X11_XRRFreeScreenResources(res);
}
res = X11_XRRGetScreenResources(dpy, RootWindow(dpy, screen));
if (!res) {
continue;
}
}
for (output = 0; output < res->noutput; output++) {
XRROutputInfo *output_info;
int display_x, display_y;
unsigned long display_mm_width, display_mm_height;
SDL_DisplayData *displaydata;
char display_name[128];
SDL_DisplayMode mode;
SDL_DisplayModeData *modedata;
SDL_VideoDisplay display;
RRMode modeID;
RRCrtc output_crtc;
XRRCrtcInfo *crtc;
int xft_dpi = 0;
/* The primary output _should_ always be sorted first, but just in case... */
if ((looking_for_primary && (res->outputs[output] != primary)) ||
(!looking_for_primary && (screen == default_screen) && (res->outputs[output] == primary))) {
continue;
}
output_info = X11_XRRGetOutputInfo(dpy, res, res->outputs[output]);
if (!output_info || !output_info->crtc || output_info->connection == RR_Disconnected) {
X11_XRRFreeOutputInfo(output_info);
continue;
}
SDL_strlcpy(display_name, output_info->name, sizeof(display_name));
display_mm_width = output_info->mm_width;
display_mm_height = output_info->mm_height;
output_crtc = output_info->crtc;
X11_XRRFreeOutputInfo(output_info);
crtc = X11_XRRGetCrtcInfo(dpy, res, output_crtc);
if (!crtc) {
continue;
}
SDL_zero(mode);
modeID = crtc->mode;
mode.w = crtc->width;
mode.h = crtc->height;
mode.format = pixelformat;
display_x = crtc->x;
display_y = crtc->y;
X11_XRRFreeCrtcInfo(crtc);
displaydata = (SDL_DisplayData *) SDL_calloc(1, sizeof(*displaydata));
if (!displaydata) {
return SDL_OutOfMemory();
}
modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
if (!modedata) {
SDL_free(displaydata);
return SDL_OutOfMemory();
}
modedata->xrandr_mode = modeID;
mode.driverdata = modedata;
displaydata->screen = screen;
displaydata->visual = vinfo.visual;
displaydata->depth = vinfo.depth;
displaydata->hdpi = display_mm_width ? (((float) mode.w) * 25.4f / display_mm_width) : 0.0f;
displaydata->vdpi = display_mm_height ? (((float) mode.h) * 25.4f / display_mm_height) : 0.0f;
displaydata->ddpi = SDL_ComputeDiagonalDPI(mode.w, mode.h, ((float) display_mm_width) / 25.4f,((float) display_mm_height) / 25.4f);
/* if xft dpi is available we will use this over xrandr */
xft_dpi = GetXftDPI(dpy);
if(xft_dpi > 0) {
displaydata->hdpi = (float)xft_dpi;
displaydata->vdpi = (float)xft_dpi;
}
displaydata->scanline_pad = scanline_pad;
displaydata->x = display_x;
displaydata->y = display_y;
displaydata->use_xrandr = SDL_TRUE;
displaydata->xrandr_output = res->outputs[output];
SetXRandRModeInfo(dpy, res, output_crtc, modeID, &mode);
SetXRandRDisplayName(dpy, EDID, display_name, sizeof (display_name), res->outputs[output], display_mm_width, display_mm_height);
SDL_zero(display);
if (*display_name) {
display.name = display_name;
}
display.desktop_mode = mode;
display.current_mode = mode;
display.driverdata = displaydata;
SDL_AddVideoDisplay(&display, SDL_FALSE);
}
X11_XRRFreeScreenResources(res);
}
}
if (_this->num_displays == 0) {
return SDL_SetError("No available displays");
}
return 0;
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
int
X11_InitModes(_THIS)
{
SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
/* XRandR is the One True Modern Way to do this on X11. If this
fails, we just won't report any display modes except the current
desktop size. */
#if SDL_VIDEO_DRIVER_X11_XRANDR
{
int xrandr_major, xrandr_minor;
/* require at least XRandR v1.3 */
if (CheckXRandR(data->display, &xrandr_major, &xrandr_minor) &&
(xrandr_major >= 2 || (xrandr_major == 1 && xrandr_minor >= 3))) {
X11_InitModes_XRandR(_this);
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
return 0;
}
void
X11_GetDisplayModes(_THIS, SDL_VideoDisplay * sdl_display)
{
Display *display = ((SDL_VideoData *) _this->driverdata)->display;
SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
SDL_DisplayMode mode;
/* 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_display->current_mode.format;
mode.driverdata = NULL;
#if SDL_VIDEO_DRIVER_X11_XRANDR
if (data->use_xrandr) {
XRRScreenResources *res;
res = X11_XRRGetScreenResources (display, RootWindow(display, data->screen));
if (res) {
SDL_DisplayModeData *modedata;
XRROutputInfo *output_info;
int i;
output_info = X11_XRRGetOutputInfo(display, res, data->xrandr_output);
if (output_info && output_info->connection != RR_Disconnected) {
for (i = 0; i < output_info->nmode; ++i) {
modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
if (!modedata) {
continue;
}
mode.driverdata = modedata;
if (!SetXRandRModeInfo(display, res, output_info->crtc, output_info->modes[i], &mode) ||
!SDL_AddDisplayMode(sdl_display, &mode)) {
SDL_free(modedata);
}
}
}
X11_XRRFreeOutputInfo(output_info);
X11_XRRFreeScreenResources(res);
}
return;
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
if (!data->use_xrandr) {
SDL_DisplayModeData *modedata;
/* Add the desktop mode */
mode = sdl_display->desktop_mode;
modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
if (modedata) {
*modedata = *(SDL_DisplayModeData *)sdl_display->desktop_mode.driverdata;
}
mode.driverdata = modedata;
if (!SDL_AddDisplayMode(sdl_display, &mode)) {
SDL_free(modedata);
}
}
}
/* This catches an error from XRRSetScreenSize, as a workaround for now. */
/* !!! FIXME: remove this later when we have a better solution. */
static int (*PreXRRSetScreenSizeErrorHandler)(Display *, XErrorEvent *) = NULL;
static int
SDL_XRRSetScreenSizeErrHandler(Display *d, XErrorEvent *e)
{
/* BadMatch: https://github.com/libsdl-org/SDL/issues/4561 */
/* BadValue: https://github.com/libsdl-org/SDL/issues/4840 */
if ((e->error_code == BadMatch) || (e->error_code == BadValue)) {
return 0;
}
return PreXRRSetScreenSizeErrorHandler(d, e);
}
int
X11_SetDisplayMode(_THIS, SDL_VideoDisplay * sdl_display, SDL_DisplayMode * mode)
{
SDL_VideoData *viddata = (SDL_VideoData *) _this->driverdata;
Display *display = viddata->display;
SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
SDL_DisplayModeData *modedata = (SDL_DisplayModeData *)mode->driverdata;
int mm_width, mm_height;
viddata->last_mode_change_deadline = SDL_GetTicks() + (PENDING_FOCUS_TIME * 2);
#if SDL_VIDEO_DRIVER_X11_XRANDR
if (data->use_xrandr) {
XRRScreenResources *res;
XRROutputInfo *output_info;
XRRCrtcInfo *crtc;
Status status;
res = X11_XRRGetScreenResources (display, RootWindow(display, data->screen));
if (!res) {
return SDL_SetError("Couldn't get XRandR screen resources");
}
output_info = X11_XRRGetOutputInfo(display, res, data->xrandr_output);
if (!output_info || output_info->connection == RR_Disconnected) {
X11_XRRFreeScreenResources(res);
return SDL_SetError("Couldn't get XRandR output info");
}
crtc = X11_XRRGetCrtcInfo(display, res, output_info->crtc);
if (!crtc) {
X11_XRRFreeOutputInfo(output_info);
X11_XRRFreeScreenResources(res);
return SDL_SetError("Couldn't get XRandR crtc info");
}
if (crtc->mode == modedata->xrandr_mode) {
#ifdef X11MODES_DEBUG
printf("already in desired mode 0x%lx (%ux%u), nothing to do\n",
crtc->mode, crtc->width, crtc->height);
#endif
status = Success;
goto freeInfo;
}
X11_XGrabServer(display);
status = X11_XRRSetCrtcConfig(display, res, output_info->crtc, CurrentTime,
0, 0, None, crtc->rotation, NULL, 0);
if (status != Success) {
goto ungrabServer;
}
mm_width = mode->w * DisplayWidthMM(display, data->screen) / DisplayWidth(display, data->screen);
mm_height = mode->h * DisplayHeightMM(display, data->screen) / DisplayHeight(display, data->screen);
/* !!! FIXME: this can get into a problem scenario when a window is
bigger than a physical monitor in a configuration where one screen
spans multiple physical monitors. A detailed reproduction case is
discussed at https://github.com/libsdl-org/SDL/issues/4561 ...
for now we cheat and just catch the X11 error and carry on, which
is likely to cause subtle issues but is better than outright
crashing */
X11_XSync(display, False);
PreXRRSetScreenSizeErrorHandler = X11_XSetErrorHandler(SDL_XRRSetScreenSizeErrHandler);
X11_XRRSetScreenSize(display, RootWindow(display, data->screen), mode->w, mode->h, mm_width, mm_height);
X11_XSync(display, False);
X11_XSetErrorHandler(PreXRRSetScreenSizeErrorHandler);
status = X11_XRRSetCrtcConfig (display, res, output_info->crtc, CurrentTime,
crtc->x, crtc->y, modedata->xrandr_mode, crtc->rotation,
&data->xrandr_output, 1);
ungrabServer:
X11_XUngrabServer(display);
freeInfo:
X11_XRRFreeCrtcInfo(crtc);
X11_XRRFreeOutputInfo(output_info);
X11_XRRFreeScreenResources(res);
if (status != Success) {
return SDL_SetError("X11_XRRSetCrtcConfig failed");
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
return 0;
}
void
X11_QuitModes(_THIS)
{
}
int
X11_GetDisplayBounds(_THIS, SDL_VideoDisplay * sdl_display, SDL_Rect * rect)
{
SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
rect->x = data->x;
rect->y = data->y;
rect->w = sdl_display->current_mode.w;
rect->h = sdl_display->current_mode.h;
return 0;
}
int
X11_GetDisplayDPI(_THIS, SDL_VideoDisplay * sdl_display, float * ddpi, float * hdpi, float * vdpi)
{
SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
if (ddpi) {
*ddpi = data->ddpi;
}
if (hdpi) {
*hdpi = data->hdpi;
}
if (vdpi) {
*vdpi = data->vdpi;
}
return data->ddpi != 0.0f ? 0 : SDL_SetError("Couldn't get DPI");
}
int
X11_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * sdl_display, SDL_Rect * rect)
{
SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
Display *display = data->display;
Atom _NET_WORKAREA;
int status, real_format;
int retval = -1;
Atom real_type;
unsigned long items_read = 0, items_left = 0;
unsigned char *propdata = NULL;
if (X11_GetDisplayBounds(_this, sdl_display, rect) < 0) {
return -1;
}
_NET_WORKAREA = X11_XInternAtom(display, "_NET_WORKAREA", False);
status = X11_XGetWindowProperty(display, DefaultRootWindow(display),
_NET_WORKAREA, 0L, 4L, False, XA_CARDINAL,
&real_type, &real_format, &items_read,
&items_left, &propdata);
if ((status == Success) && (items_read >= 4)) {
const long *p = (long*) propdata;
const SDL_Rect usable = { (int)p[0], (int)p[1], (int)p[2], (int)p[3] };
retval = 0;
if (!SDL_IntersectRect(rect, &usable, rect)) {
SDL_zerop(rect);
}
}
if (propdata) {
X11_XFree(propdata);
}
return retval;
}
#endif /* SDL_VIDEO_DRIVER_X11 */
/* vi: set ts=4 sw=4 expandtab: */
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