fonts: Reduce the public API surface (#39112)

This change marks all items that are not used by other crates as
`pub(crate)` instead of `pub`.

Additionally, I've removed all code that turned out to be unused. I
think most of it was used only by `layout-2013`.


Testing: The correctness of these changes is verified by the compiler,
so no tests are needed.

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

components/fonts/platform/freetype/android/font_list.rs

@@ -413,7 +413,7 @@ impl FontList {
 }
 
 // Functions used by SystemFontSerivce
-pub fn for_each_available_family<F>(mut callback: F)
+pub(crate) fn for_each_available_family<F>(mut callback: F)
 where
     F: FnMut(String),
 {
@@ -425,7 +425,7 @@ where
     }
 }
 
-pub fn for_each_variation<F>(family_name: &str, mut callback: F)
+pub(crate) fn for_each_variation<F>(family_name: &str, mut callback: F)
 where
     F: FnMut(FontTemplate),
 {
@@ -534,7 +534,9 @@ pub fn fallback_font_families(options: FallbackFontSelectionOptions) -> Vec<&'st
     families
 }
 
-pub fn default_system_generic_font_family(generic: GenericFontFamily) -> LowercaseFontFamilyName {
+pub(crate) fn default_system_generic_font_family(
+    generic: GenericFontFamily,
+) -> LowercaseFontFamilyName {
     match generic {
         GenericFontFamily::None | GenericFontFamily::Serif => "serif",
         GenericFontFamily::SansSerif => "sans-serif",

components/fonts/platform/freetype/font_list.rs

@@ -34,7 +34,7 @@ use crate::{
     LowercaseFontFamilyName,
 };
 
-pub fn for_each_available_family<F>(mut callback: F)
+pub(crate) fn for_each_available_family<F>(mut callback: F)
 where
     F: FnMut(String),
 {
@@ -69,7 +69,7 @@ where
     }
 }
 
-pub fn for_each_variation<F>(family_name: &str, mut callback: F)
+pub(crate) fn for_each_variation<F>(family_name: &str, mut callback: F)
 where
     F: FnMut(FontTemplate),
 {
@@ -180,7 +180,9 @@ pub fn fallback_font_families(options: FallbackFontSelectionOptions) -> Vec<&'st
     families
 }
 
-pub fn default_system_generic_font_family(generic: GenericFontFamily) -> LowercaseFontFamilyName {
+pub(crate) fn default_system_generic_font_family(
+    generic: GenericFontFamily,
+) -> LowercaseFontFamilyName {
     let generic_string = match generic {
         GenericFontFamily::None | GenericFontFamily::Serif => "serif",
         GenericFontFamily::SansSerif => "sans-serif",

components/fonts/platform/freetype/library_handle.rs

@@ -53,7 +53,7 @@ extern "C" fn ft_realloc(
 /// dropped during execution.
 #[derive(Clone, Debug)]
 pub(crate) struct FreeTypeLibraryHandle {
-    pub freetype_library: FT_Library,
+    pub(crate) freetype_library: FT_Library,
     freetype_memory: FT_Memory,
 }
 

components/fonts/platform/freetype/ohos/font_list.rs

@@ -425,7 +425,7 @@ impl FontList {
 }
 
 // Functions used by SystemFontService
-pub fn for_each_available_family<F>(mut callback: F)
+pub(crate) fn for_each_available_family<F>(mut callback: F)
 where
     F: FnMut(String),
 {
@@ -437,7 +437,7 @@ where
     }
 }
 
-pub fn for_each_variation<F>(family_name: &str, mut callback: F)
+pub(crate) fn for_each_variation<F>(family_name: &str, mut callback: F)
 where
     F: FnMut(FontTemplate),
 {
@@ -565,7 +565,9 @@ pub fn fallback_font_families(options: FallbackFontSelectionOptions) -> Vec<&'st
     families
 }
 
-pub fn default_system_generic_font_family(generic: GenericFontFamily) -> LowercaseFontFamilyName {
+pub(crate) fn default_system_generic_font_family(
+    generic: GenericFontFamily,
+) -> LowercaseFontFamilyName {
     let default_font = "HarmonyOS Sans".into();
     match generic {
         GenericFontFamily::Monospace => {

components/fonts/platform/macos/font.rs

@@ -42,7 +42,7 @@ fn pt_to_px(pt: f64) -> f64 {
 }
 
 impl FontTable {
-    pub fn wrap(data: CFData) -> FontTable {
+    pub(crate) fn wrap(data: CFData) -> FontTable {
         FontTable { data }
     }
 }

components/fonts/platform/macos/font_list.rs

@@ -16,7 +16,7 @@ use crate::{
     FontTemplateDescriptor, LowercaseFontFamilyName,
 };
 
-pub fn for_each_available_family<F>(mut callback: F)
+pub(crate) fn for_each_available_family<F>(mut callback: F)
 where
     F: FnMut(String),
 {
@@ -26,7 +26,7 @@ where
     }
 }
 
-pub fn for_each_variation<F>(family_name: &str, mut callback: F)
+pub(crate) fn for_each_variation<F>(family_name: &str, mut callback: F)
 where
     F: FnMut(FontTemplate),
 {
@@ -175,7 +175,9 @@ pub fn fallback_font_families(options: FallbackFontSelectionOptions) -> Vec<&'st
     families
 }
 
-pub fn default_system_generic_font_family(generic: GenericFontFamily) -> LowercaseFontFamilyName {
+pub(crate) fn default_system_generic_font_family(
+    generic: GenericFontFamily,
+) -> LowercaseFontFamilyName {
     match generic {
         GenericFontFamily::None | GenericFontFamily::Serif => "Times",
         GenericFontFamily::SansSerif => "Helvetica",

components/fonts/platform/windows/font.rs

@@ -49,7 +49,7 @@ pub struct FontTable {
 }
 
 impl FontTable {
-    pub fn wrap(data: &[u8]) -> FontTable {
+    pub(crate) fn wrap(data: &[u8]) -> FontTable {
         FontTable {
             data: data.to_vec(),
         }

components/fonts/platform/windows/font_list.rs

@@ -16,7 +16,7 @@ use crate::{
     FontTemplateDescriptor, LowercaseFontFamilyName,
 };
 
-pub fn for_each_available_family<F>(mut callback: F)
+pub(crate) fn for_each_available_family<F>(mut callback: F)
 where
     F: FnMut(String),
 {
@@ -28,7 +28,7 @@ where
     }
 }
 
-pub fn for_each_variation<F>(family_name: &str, mut callback: F)
+pub(crate) fn for_each_variation<F>(family_name: &str, mut callback: F)
 where
     F: FnMut(FontTemplate),
 {
@@ -338,7 +338,9 @@ fn font_template_descriptor_from_font(font: &Font) -> FontTemplateDescriptor {
     FontTemplateDescriptor::new(weight, stretch, style)
 }
 
-pub fn default_system_generic_font_family(generic: GenericFontFamily) -> LowercaseFontFamilyName {
+pub(crate) fn default_system_generic_font_family(
+    generic: GenericFontFamily,
+) -> LowercaseFontFamilyName {
     match generic {
         GenericFontFamily::None | GenericFontFamily::Serif => "Times New Roman",
         GenericFontFamily::SansSerif => "Arial",