Bug 1874035 - Add custom Debug derives for bitflags with custom deriv…

…es. r=gfx-reviewers,emilio,ErichDonGubler

bitflags 2 has a shortcoming with using custom derives: you can't use
custom derives (for e.g. MallocSizeOf) at the same time as bitflags's for
the derives it supports.
See bitflags/bitflags#395

Differential Revision: https://phabricator.services.mozilla.com/D199941

UltraBlame original commit: 45bd6cc1bf7490f80630afce7550706e9b064f81

build/rust/bitflags/lib.rs

@@ -7,6 +7,13 @@ bitflags
 as
 bitflags2
 ;
+pub
+use
+bitflags
+:
+:
+parser
+;
 #
 [
 macro_export
@@ -95,7 +102,6 @@ outer
 [
 derive
 (
-Debug
 Clone
 Copy
 PartialEq
@@ -112,6 +118,93 @@ BitFlags
 T
 )
 ;
+impl
+core
+:
+:
+fmt
+:
+:
+Debug
+for
+BitFlags
+{
+fn
+fmt
+(
+&
+self
+f
+:
+&
+mut
+core
+:
+:
+fmt
+:
+:
+Formatter
+)
+-
+>
+core
+:
+:
+fmt
+:
+:
+Result
+{
+if
+self
+.
+is_empty
+(
+)
+{
+core
+:
+:
+write
+!
+(
+f
+"
+{
+:
+#
+x
+}
+"
+Self
+:
+:
+empty
+(
+)
+.
+bits
+(
+)
+)
+}
+else
+{
+crate
+:
+:
+parser
+:
+:
+to_writer
+(
+self
+f
+)
+}
+}
+}
 bitflags2
 !
 {

gfx/wr/webrender/src/clip.rs

@@ -3531,7 +3531,6 @@ Deserialize
 [
 derive
 (
-Debug
 Copy
 PartialEq
 Eq
@@ -3574,6 +3573,90 @@ USE_FAST_PATH
 ;
 }
 }
+impl
+core
+:
+:
+fmt
+:
+:
+Debug
+for
+ClipNodeFlags
+{
+fn
+fmt
+(
+&
+self
+f
+:
+&
+mut
+core
+:
+:
+fmt
+:
+:
+Formatter
+)
+-
+>
+core
+:
+:
+fmt
+:
+:
+Result
+{
+if
+self
+.
+is_empty
+(
+)
+{
+write
+!
+(
+f
+"
+{
+:
+#
+x
+}
+"
+Self
+:
+:
+empty
+(
+)
+.
+bits
+(
+)
+)
+}
+else
+{
+bitflags
+:
+:
+parser
+:
+:
+to_writer
+(
+self
+f
+)
+}
+}
+}
 #
 [
 derive

gfx/wr/webrender/src/gpu_types.rs

@@ -2914,7 +2914,6 @@ Deserialize
 [
 derive
 (
-Debug
 Copy
 PartialEq
 Eq
@@ -3151,6 +3150,90 @@ FORCE_AA
 ;
 }
 }
+impl
+core
+:
+:
+fmt
+:
+:
+Debug
+for
+BrushFlags
+{
+fn
+fmt
+(
+&
+self
+f
+:
+&
+mut
+core
+:
+:
+fmt
+:
+:
+Formatter
+)
+-
+>
+core
+:
+:
+fmt
+:
+:
+Result
+{
+if
+self
+.
+is_empty
+(
+)
+{
+write
+!
+(
+f
+"
+{
+:
+#
+x
+}
+"
+Self
+:
+:
+empty
+(
+)
+.
+bits
+(
+)
+)
+}
+else
+{
+bitflags
+:
+:
+parser
+:
+:
+to_writer
+(
+self
+f
+)
+}
+}
+}
 pub
 struct
 BrushInstance