closedcaption: move some textstyle helpers to shared files

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1398>

video/closedcaption/src/cea608tocea708/imp.rs

@@ -14,7 +14,7 @@ use gst::subclass::prelude::*;
 use atomic_refcell::AtomicRefCell;
 
 use crate::cea608utils::*;
-use crate::cea708utils::Cea708ServiceWriter;
+use crate::cea708utils::{Cea708ServiceWriter, textstyle_foreground_color, textstyle_to_pen_color, Cea708ServiceWriter};
 
 use gst::glib::once_cell::sync::Lazy;
 
@@ -67,65 +67,6 @@ struct Cea708ServiceState {
     pen_attributes: SetPenAttributesArgs,
 }
 
-fn textstyle_foreground_color(style: TextStyle) -> Color {
-    match style {
-        TextStyle::Red => Color {
-            r: ColorValue::Full,
-            g: ColorValue::None,
-            b: ColorValue::None,
-        },
-        TextStyle::Green => Color {
-            r: ColorValue::None,
-            g: ColorValue::Full,
-            b: ColorValue::None,
-        },
-        TextStyle::Blue => Color {
-            r: ColorValue::None,
-            g: ColorValue::None,
-            b: ColorValue::Full,
-        },
-        TextStyle::Cyan => Color {
-            r: ColorValue::None,
-            g: ColorValue::Full,
-            b: ColorValue::Full,
-        },
-        TextStyle::Yellow => Color {
-            r: ColorValue::Full,
-            g: ColorValue::Full,
-            b: ColorValue::None,
-        },
-        TextStyle::Magenta => Color {
-            r: ColorValue::Full,
-            g: ColorValue::None,
-            b: ColorValue::Full,
-        },
-        TextStyle::White | TextStyle::ItalicWhite => Color {
-            r: ColorValue::Full,
-            g: ColorValue::Full,
-            b: ColorValue::Full,
-        },
-    }
-}
-
-fn textstyle_to_pen_color(style: TextStyle) -> SetPenColorArgs {
-    let black = Color {
-        r: ColorValue::None,
-        g: ColorValue::None,
-        b: ColorValue::None,
-    };
-    SetPenColorArgs {
-        foreground_color: textstyle_foreground_color(style),
-        foreground_opacity: Opacity::Solid,
-        background_color: black,
-        background_opacity: Opacity::Solid,
-        edge_color: black,
-    }
-}
-
-fn textstyle_is_italics(style: TextStyle) -> bool {
-    style == TextStyle::ItalicWhite
-}
-
 fn cea608_mode_visible_rows(mode: Cea608Mode) -> u8 {
     match mode {
         Cea608Mode::RollUp2 => 2,
@@ -213,9 +154,9 @@ impl Cea708ServiceState {
         }
 
         let mut need_pen_attributes = false;
-        if self.pen_attributes.italics != textstyle_is_italics(preamble.style) {
+        if self.pen_attributes.italics != preamble.style.is_italics() {
             need_pen_attributes = true;
-            self.pen_attributes.italics = textstyle_is_italics(preamble.style);
+            self.pen_attributes.italics = preamble.style.is_italics();
         }
 
         if self.pen_attributes.underline != (preamble.underline > 0) {
@@ -241,9 +182,9 @@ impl Cea708ServiceState {
         }
 
         let mut need_pen_attributes = false;
-        if self.pen_attributes.italics != textstyle_is_italics(midrowchange.style) {
+        if self.pen_attributes.italics != midrowchange.style.is_italics() {
             need_pen_attributes = true;
-            self.pen_attributes.italics = textstyle_is_italics(midrowchange.style);
+            self.pen_attributes.italics = midrowchange.style.is_italics();
         }
 
         if self.pen_attributes.underline != midrowchange.underline {

video/closedcaption/src/cea608utils.rs

@@ -45,6 +45,12 @@ pub enum TextStyle {
     ItalicWhite,
 }
 
+impl TextStyle {
+    pub fn is_italics(&self) -> bool {
+        *self == TextStyle::ItalicWhite
+    }
+}
+
 impl From<u32> for TextStyle {
     fn from(val: u32) -> Self {
         match val {

video/closedcaption/src/cea708utils.rs

@@ -8,7 +8,11 @@
 
 use cea708_types::{tables::*, Service};
 
+use gst::glib;
 use gst::glib::once_cell::sync::Lazy;
+use serde::{Deserialize, Serialize};
+
+use crate::cea608utils::TextStyle;
 
 static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
     gst::DebugCategory::new(
@@ -18,6 +22,72 @@ static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
     )
 });
 
+#[derive(
+    Serialize, Deserialize, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Clone, Copy, glib::Enum,
+)]
+#[repr(u32)]
+#[enum_type(name = "GstTtToCea708Mode")]
+pub enum Cea708Mode {
+    PopOn,
+    PaintOn,
+    RollUp,
+}
+
+pub fn textstyle_foreground_color(style: TextStyle) -> Color {
+    match style {
+        TextStyle::Red => Color {
+            r: ColorValue::Full,
+            g: ColorValue::None,
+            b: ColorValue::None,
+        },
+        TextStyle::Green => Color {
+            r: ColorValue::None,
+            g: ColorValue::Full,
+            b: ColorValue::None,
+        },
+        TextStyle::Blue => Color {
+            r: ColorValue::None,
+            g: ColorValue::None,
+            b: ColorValue::Full,
+        },
+        TextStyle::Cyan => Color {
+            r: ColorValue::None,
+            g: ColorValue::Full,
+            b: ColorValue::Full,
+        },
+        TextStyle::Yellow => Color {
+            r: ColorValue::Full,
+            g: ColorValue::Full,
+            b: ColorValue::None,
+        },
+        TextStyle::Magenta => Color {
+            r: ColorValue::Full,
+            g: ColorValue::None,
+            b: ColorValue::Full,
+        },
+        TextStyle::White | TextStyle::ItalicWhite => Color {
+            r: ColorValue::Full,
+            g: ColorValue::Full,
+            b: ColorValue::Full,
+        },
+    }
+}
+
+pub fn textstyle_to_pen_color(style: TextStyle) -> SetPenColorArgs {
+    let black = Color {
+        r: ColorValue::None,
+        g: ColorValue::None,
+        b: ColorValue::None,
+    };
+    SetPenColorArgs {
+        foreground_color: textstyle_foreground_color(style),
+        foreground_opacity: Opacity::Solid,
+        background_color: black,
+        background_opacity: Opacity::Solid,
+        edge_color: black,
+    }
+}
+
 #[derive(Debug)]
 pub enum WriteError {
     // returns the number of characters/bytes written