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Added SDL_HINT_VIDEO_X11_SCALING_FACTOR to allow overriding the content scale on X11 (thanks Andres!)

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This commit is contained in:
Sam Lantinga
2023-06-18 12:19:43 -07:00
parent 210c135f74
commit 4e81b4e8de
2 changed files with 37 additions and 17 deletions
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include/SDL3/SDL_hints.h
+7
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@@ -1938,6 +1938,13 @@ extern "C" {
*/
#define SDL_HINT_VIDEO_X11_WINDOW_VISUALID "SDL_VIDEO_X11_WINDOW_VISUALID"
/**
* \brief A variable forcing the scaling factor for X11 windows
*
* This variable can be set to a floating point value in the range 1.0-10.0f
*/
#define SDL_HINT_VIDEO_X11_SCALING_FACTOR "SDL_VIDEO_X11_SCALING_FACTOR"
/**
* \brief A variable controlling whether the X11 XRandR extension should be used.
*
src/video/x11/SDL_x11modes.c
+15 -2
View File
@@ -164,8 +164,20 @@ static float GetGlobalContentScale(SDL_VideoDevice *_this)
static double scale_factor = 0.0;
if (scale_factor <= 0.0) {
/* First try the settings portal via D-Bus for the text scaling factor (aka 'Global Scale' on KDE) */
/* First use the forced scaling factor specified by the app/user */
const char *hint = SDL_GetHint(SDL_HINT_VIDEO_X11_SCALING_FACTOR);
if (hint && *hint) {
double value = SDL_atof(hint);
if (value >= 1.0f && value <= 10.0f) {
scale_factor = value;
}
}
/* Next try the settings portal via D-Bus for the text scaling factor (aka 'Global Scale' on KDE) */
#ifdef SDL_USE_LIBDBUS
if (scale_factor <= 0.0)
{
DBusMessage *reply;
SDL_DBusContext *dbus = SDL_DBus_GetContext();
@@ -183,10 +195,11 @@ static float GetGlobalContentScale(SDL_VideoDevice *_this)
dbus->message_unref(reply);
}
}
}
#endif
/* If that failed, try "Xft.dpi" from the XResourcesDatabase... */
if (scale_factor <= 0.0)
#endif
{
SDL_VideoData *data = _this->driverdata;
Display *display = data->display;