Better divide by zero fix

Author: cncz42

video/out/wayland_common.c

@@ -305,7 +305,7 @@ struct vo_wayland_preferred_description_info {
     struct pl_color_space csp;
     void *icc_file;
     uint32_t icc_size;
-    float reference_luminance;
+    uint32_t reference_luminance;
 };
 
 static bool single_output_spanned(struct vo_wayland_state *wl);
@@ -2199,12 +2199,7 @@ static void info_luminances(void *data, struct wp_image_description_info_v1 *ima
     struct vo_wayland_preferred_description_info *wd = data;
     if (!wd->is_parametric)
         return;
-    if (reference_lum != 0) {
-        wd->reference_luminance = (float)reference_lum;
-    } else {
-        wd->reference_luminance = 203.0f;
-    }
-
+    wd->reference_luminance = reference_lum;
 }
 
 static void info_target_primaries(void *data, struct wp_image_description_info_v1 *image_description_info,
@@ -2231,7 +2226,11 @@ static void info_target_luminance(void *data, struct wp_image_description_info_v
     if (!wd->is_parametric)
         return;
     wd->csp.hdr.min_luma = (float)min_lum / WAYLAND_MIN_LUM_FACTOR;
-    wd->csp.hdr.max_luma = (float)max_lum * (203.0f/wd->reference_luminance);
+    if (wd->reference_luminance) {
+        wd->csp.hdr.max_luma = (float)max_lum * (203.0f/(float)(wd->reference_luminance));
+    } else {
+        wd->csp.hdr.max_luma = (float)max_lum;
+    }
 }
 
 static void info_target_max_cll(void *data, struct wp_image_description_info_v1 *image_description_info,
@@ -2240,7 +2239,11 @@ static void info_target_max_cll(void *data, struct wp_image_description_info_v1
     struct vo_wayland_preferred_description_info *wd = data;
     if (!wd->is_parametric)
         return;
-    wd->csp.hdr.max_cll = (float)max_cll * (203.0f/wd->reference_luminance);
+    if (wd->reference_luminance) {
+        wd->csp.hdr.max_cll = (float)max_cll * (203.0f/(float)(wd->reference_luminance));
+    } else {
+        wd->csp.hdr.max_cll = (float)max_cll;
+    }
 }
 
 static void info_target_max_fall(void *data, struct wp_image_description_info_v1 *image_description_info,