intel/isl: Add isl_format_is_valid

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

src/intel/isl/gen_format_layout.py

@@ -89,6 +89,14 @@ isl_format_layouts[] = {
 % endfor
 };
 
+bool
+isl_format_is_valid(enum isl_format format)
+{
+    if (format >= sizeof(isl_format_layouts) / sizeof(isl_format_layouts[0]))
+        return false;
+    return isl_format_layouts[format].name;
+}
+
 enum isl_format
 isl_format_srgb_to_linear(enum isl_format format)
 {

src/intel/isl/isl.h

@@ -1410,6 +1410,8 @@ isl_format_get_layout(enum isl_format fmt)
    return &isl_format_layouts[fmt];
 }
 
+bool isl_format_is_valid(enum isl_format);
+
 static inline const char * ATTRIBUTE_CONST
 isl_format_get_name(enum isl_format fmt)
 {