LibGfx: Use new AK+Swift extensions to simplify parseHexString

Author: https://github.com/ADKaster
Commit: e15dd3c22a
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1175
Reviewed-by: https://github.com/AtkinsSJ

Userland/Libraries/LibGfx/CMakeLists.txt

@@ -123,6 +123,7 @@ if (ENABLE_SWIFT)
         Color.swift
     )
     target_compile_definitions(LibGfx PRIVATE LIBGFX_USE_SWIFT)
+    target_link_libraries(LibGfx PRIVATE AK)
     set_target_properties(LibGfx PROPERTIES Swift_MODULE_NAME "SwiftLibGfx")
 
     # FIXME: These should be pulled automatically from interface compile options for the target
@@ -131,6 +132,7 @@ if (ENABLE_SWIFT)
         -Xcc -ivfsoverlay${Lagom_BINARY_DIR}/AK/vfs_overlay.yaml
     )
     get_target_property(LIBGFX_NATIVE_DIRS LibGfx INCLUDE_DIRECTORIES)
+    list(APPEND LIBGFX_NATIVE_DIRS ${CMAKE_Swift_MODULE_DIRECTORY})
     _swift_generate_cxx_header(LibGfx "LibGfx-Swift.h"
         SEARCH_PATHS ${LIBGFX_NATIVE_DIRS}
         COMPILE_OPTIONS ${VFS_OVERLAY_OPTIONS}

Userland/Libraries/LibGfx/Color.cpp

@@ -268,14 +268,9 @@ Optional<Color> Color::from_named_css_color_string(StringView string)
 }
 
 #if defined(LIBGFX_USE_SWIFT)
-static swift::String to_swift_string(StringView string)
-{
-    return swift::String(std::string(string.characters_without_null_termination(), string.length()));
-}
-
 static Optional<Color> hex_string_to_color(StringView string)
 {
-    auto color = SwiftLibGfx::parseHexString(to_swift_string(string));
+    auto color = SwiftLibGfx::parseHexString(string);
     if (color.getCount() == 0)
         return {};
     return color[0];

Userland/Libraries/LibGfx/Color.swift

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-import AK
+import SwiftAK
 import LibGfx
 
 // FIXME: Do this without extending String with an index operation that was explicitly deleted :^)
@@ -32,7 +32,11 @@ private func hexNibblesToUInt8(_ nib1: Character, _ nib2: Character) -> UInt8? {
 }
 
 // FIXME: Return Gfx.Color? When swift ABI bug is fixed
-public func parseHexString(_ string: Swift.String) -> [Gfx.Color] {
+public func parseHexString(_ rawString: AK.StringView) -> [Gfx.Color] {
+    guard let string = Swift.String(rawString) else {
+        return []
+    }
+
     assert(string.hasPrefix("#"))
 
     switch string.count {