Monitor (macOS): detect maximum refresh rate

src/detection/monitor/monitor.h

@@ -5,6 +5,7 @@ typedef struct FFMonitorResult
     FFstrbuf name;
     uint32_t width; // native / maximum resolution, in pixels
     uint32_t height; // native / maximum resolution, in pixels
+    double refreshRate;// maximum refresh rate in native resolution, in Hz
     uint32_t physicalWidth; // in mm
     uint32_t physicalHeight; // in mm
     bool hdrCompatible;

src/detection/monitor/monitor_apple.m

@@ -102,6 +102,19 @@ const char* ffDetectMonitor(FFlist* results)
             detectHdrSupportWithNSScreen(display);
         monitor->serial = CGDisplaySerialNumber((CGDirectDisplayID) display->id);
 
+        FF_CFTYPE_AUTO_RELEASE CFArrayRef modes = CGDisplayCopyAllDisplayModes((CGDirectDisplayID) display->id, NULL);
+        double maxRefreshRate = 0;
+        for (uint32_t j = 0; j < CFArrayGetCount(modes); ++j)
+        {
+            CGDisplayModeRef mode = (CGDisplayModeRef) CFArrayGetValueAtIndex(modes, j);
+            if (CGDisplayModeGetWidth(mode) == (uint32_t) width && CGDisplayModeGetHeight(mode) == (uint32_t) height)
+            {
+                double refreshRate = CGDisplayModeGetRefreshRate(mode);
+                if (refreshRate > maxRefreshRate) maxRefreshRate = refreshRate;
+            }
+        }
+        monitor->refreshRate = maxRefreshRate;
+
         int64_t year, week;
         if (ffCfDictGetInt64(displayInfo, CFSTR("DisplayYearManufacture"), &year) == NULL)
             monitor->manufactureYear = (uint16_t) year;

src/detection/monitor/monitor_linux.c

@@ -61,6 +61,7 @@ const char* ffDetectMonitor(FFlist* results)
             ffEdidGetPhysicalSize(edidData, &display->physicalWidth, &display->physicalHeight);
             ffEdidGetSerialAndManufactureDate(edidData, &display->serial, &display->manufactureYear, &display->manufactureWeek);
             display->hdrCompatible = ffEdidGetHdrCompatible(edidData, (uint32_t) edidLength);
+            display->refreshRate = 0;
         }
 
         ffStrbufSubstrBefore(&drmDir, drmDirLength);

src/detection/monitor/monitor_windows.c

@@ -49,6 +49,7 @@ const char* ffDetectMonitor(FFlist* results)
         ffStrbufInit(&display->name);
         ffEdidGetName(edidData, &display->name);
         ffEdidGetPhysicalSize(edidData, &display->physicalWidth, &display->physicalHeight);
+        display->refreshRate = 0;
     }
     return NULL;
 }

src/modules/monitor/monitor.c

@@ -6,7 +6,7 @@
 
 #include <math.h>
 
-#define FF_MONITOR_NUM_FORMAT_ARGS 10
+#define FF_MONITOR_NUM_FORMAT_ARGS 11
 
 void ffPrintMonitor(FFMonitorOptions* options)
 {
@@ -52,6 +52,8 @@ void ffPrintMonitor(FFMonitorOptions* options)
             ffPrintLogoAndKey(key.chars, 0, &options->moduleArgs, FF_PRINT_TYPE_NO_CUSTOM_KEY);
 
             printf("%ux%u px", display->width, display->height);
+            if (display->refreshRate > 0)
+                printf(" @ %.2f Hz", display->refreshRate);
             if (inch > 0)
                 printf(" - %ux%u mm (%.2f inches, %.2f ppi)\n", display->physicalWidth, display->physicalHeight, inch, ppi);
             else
@@ -79,6 +81,7 @@ void ffPrintMonitor(FFMonitorOptions* options)
                 {FF_FORMAT_ARG_TYPE_UINT16, &display->manufactureYear, "manufacture-year"},
                 {FF_FORMAT_ARG_TYPE_UINT16, &display->manufactureWeek, "manufacture-week"},
                 {FF_FORMAT_ARG_TYPE_STRING, buf, "serial"},
+                {FF_FORMAT_ARG_TYPE_DOUBLE, buf, "refresh-rate"},
             }));
         }
 
@@ -153,6 +156,8 @@ void ffGenerateMonitorJsonResult(FF_MAYBE_UNUSED FFMonitorOptions* options, yyjs
             yyjson_mut_obj_add_uint(doc, physical, "height", item->physicalHeight);
             yyjson_mut_obj_add_uint(doc, physical, "width", item->physicalWidth);
 
+            yyjson_mut_obj_add_real(doc, obj, "refreshRate", item->refreshRate);
+
             if (item->manufactureYear)
             {
                 yyjson_mut_val* manufactureDate = yyjson_mut_obj_add_obj(doc, obj, "manufactureDate");
@@ -190,6 +195,7 @@ void ffPrintMonitorHelpFormat(void)
         "Year of manufacturing - manufacture-year",
         "Nth week of manufacturing in the year - manufacture-week",
         "Serial number - serial",
+        "Maximum refresh rate in Hz - refresh-rate",
     }));
 }