Add support for icon_variants in Web Extensions.

https://webkit.org/b/278818
rdar://problem/134885372

Reviewed by NOBODY (OOPS!).

Add support for `icon_variants` manifest parsing under the `WK_WEB_EXTENSIONS_ICON_VARIANTS` flag,
with optimizations to ensure efficient icon loading.

This change introduces `icon_variants` manifest parsing, explicitly supporting different icon sets,
such as dark mode icons. To achieve this efficiently, icons are now cached by size, reducing disk
I/O by avoiding repeated loads when the browser frequently requests the same icon. The cache is
automatically invalidated when device scales change, such as when connecting or disconnecting a
display with a different scale factor.

Only the necessary icons are loaded based on the specific scale factor of all screens, halving the
image loads compared to previous behavior. This ensures that even as more extensions adopt dark
mode icons, typical image loads remain at two images (light and dark).

Proposal: https://github.com/w3c/webextensions/blob/main/proposals/dark_mode_extension_icons.md
WECG issue: w3c/webextensions#229

* Source/WTF/wtf/PlatformEnableCocoa.h: Added ENABLE_WK_WEB_EXTENSIONS_ICON_VARIANTS.
* Source/WebCore/en.lproj/Localizable.strings: Updated.
* Source/WebKit/Platform/cocoa/CocoaHelpers.h:
* Source/WebKit/Platform/cocoa/CocoaHelpers.mm:
(WebKit::availableScreenScales): Added.
(WebKit::largestDisplayScale): Added.
* Source/WebKit/Platform/spi/ios/UIKitSPI.h:
* Source/WebKit/UIProcess/Extensions/Cocoa/WebExtensionActionCocoa.mm:
(WebKit::WebExtensionAction::icon):
* Source/WebKit/UIProcess/Extensions/Cocoa/WebExtensionCocoa.mm:
(WebKit::WebExtension::icon):
(WebKit::WebExtension::actionIcon):
(WebKit::WebExtension::populateActionPropertiesIfNeeded):
(WebKit::WebExtension::populateSidebarActionProperties):
(WebKit::WebExtension::populateSidePanelProperties):
(WebKit::WebExtension::imageForPath):
(WebKit::WebExtension::bestSizeInIconsDictionary): Added.
(WebKit::WebExtension::pathForBestImageInIconsDictionary):
(WebKit::WebExtension::bestImageInIconsDictionary):
(WebKit::WebExtension::bestImageForIconsDictionaryManifestKey):
(WebKit::toColorSchemes): Added.
(WebKit::WebExtension::iconsDictionaryForBestIconVariant): Added.
(WebKit::WebExtension::bestImageForIconVariants): Added.
(WebKit::WebExtension::bestImageForIconVariantsManifestKey): Added.
* Source/WebKit/UIProcess/Extensions/Cocoa/WebExtensionMenuItemCocoa.mm:
(WebKit::WebExtensionMenuItem::icon const):
* Source/WebKit/UIProcess/Extensions/WebExtension.h:
* Tools/TestWebKitAPI/Tests/WebKitCocoa/WKWebExtension.mm:
(TestWebKitAPI::TEST(WKWebExtension, MultipleIconVariants)): Added.
(TestWebKitAPI::TEST(WKWebExtension, SingleIconVariant)): Added.
(TestWebKitAPI::TEST(WKWebExtension, AnySizeIconVariant)): Added.
(TestWebKitAPI::TEST(WKWebExtension, NoIconVariants)): Added.
(TestWebKitAPI::TEST(WKWebExtension, IconsAndIconVariantsSpecified)): Added.
(TestWebKitAPI::TEST(WKWebExtension, ActionIconVariantsMultiple)): Added.
(TestWebKitAPI::TEST(WKWebExtension, ActionIconSingleVariant)): Added.
(TestWebKitAPI::TEST(WKWebExtension, ActionIconAnySizeVariant)): Added.
(TestWebKitAPI::TEST(WKWebExtension, ActionNoIconVariants)): Added.
(TestWebKitAPI::TEST(WKWebExtension, ActionIconsAndIconVariantsSpecified)): Added.
* Tools/TestWebKitAPI/cocoa/WebExtensionUtilities.h:
* Tools/TestWebKitAPI/cocoa/WebExtensionUtilities.mm:
(TestWebKitAPI::Util::performWithAppearance): Added.
(TestWebKitAPI::Util::pixelColor): Added.
(TestWebKitAPI::Util::toSRGBColor): Added.
(TestWebKitAPI::Util::compareColors): Added.

Source/WTF/wtf/PlatformEnableCocoa.h

@@ -1010,10 +1010,17 @@
 #define ENABLE_WIRELESS_PLAYBACK_TARGET_AVAILABILITY_API 1
 #endif
 
-#if !defined(ENABLE_WK_WEB_EXTENSIONS) && (PLATFORM(MAC) || PLATFORM(MACCATALYST) || PLATFORM(IOS) || PLATFORM(IOS_SIMULATOR) || PLATFORM(VISION))
+#if !defined(ENABLE_WK_WEB_EXTENSIONS) && (PLATFORM(MAC) || PLATFORM(MACCATALYST) || PLATFORM(IOS) || PLATFORM(VISION))
 #define ENABLE_WK_WEB_EXTENSIONS 1
 #endif
 
+#if !defined(ENABLE_WK_WEB_EXTENSIONS_ICON_VARIANTS) \
+    && ((PLATFORM(MAC) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 150500) \
+    || ((PLATFORM(IOS) || PLATFORM(MACCATALYST)) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 180500) \
+    || (PLATFORM(VISION) && __VISION_OS_VERSION_MAX_ALLOWED >= 20500))
+#define ENABLE_WK_WEB_EXTENSIONS_ICON_VARIANTS ENABLE_WK_WEB_EXTENSIONS
+#endif
+
 #if !defined(ENABLE_WK_WEB_EXTENSIONS_SIDEBAR)
 #define ENABLE_WK_WEB_EXTENSIONS_SIDEBAR 0 && ENABLE_WK_WEB_EXTENSIONS
 #endif

Source/WebCore/en.lproj/Localizable.strings

@@ -616,6 +616,12 @@
 /* WKWebExtensionErrorInvalidActionIcon description for failing to load images for browser_action or page_action */
 "Failed to load images in `default_icon` for the `browser_action` or `page_action` manifest entry." = "Failed to load images in `default_icon` for the `browser_action` or `page_action` manifest entry.";
 
+/* WKWebExtensionErrorInvalidActionIcon description for failing to load image variantss for action */
+"Failed to load images in `icon_variants` for the `action` manifest entry." = "Failed to load images in `icon_variants` for the `action` manifest entry.";
+
+/* WKWebExtensionErrorInvalidIcon description for failing to load image variants */
+"Failed to load images in `icon_variants` manifest entry." = "Failed to load images in `icon_variants` manifest entry.";
+
 /* WKWebExtensionErrorInvalidIcon description for failing to load images */
 "Failed to load images in `icons` manifest entry." = "Failed to load images in `icons` manifest entry.";
 

Source/WebKit/Platform/cocoa/CocoaHelpers.h

@@ -136,6 +136,9 @@ NSString *escapeCharactersInString(NSString *, NSString *charactersToEscape);
 
 void callAfterRandomDelay(Function<void()>&&);
 
+NSSet *availableScreenScales();
+CGFloat largestDisplayScale();
+
 NSDate *toAPI(const WallTime&);
 WallTime toImpl(NSDate *);
 

Source/WebKit/Platform/cocoa/CocoaHelpers.mm

@@ -38,6 +38,10 @@
 #import <wtf/BlockPtr.h>
 #import <wtf/FileSystem.h>
 
+#if PLATFORM(IOS_FAMILY)
+#import <UIKit/UIKit.h>
+#endif
+
 namespace WebKit {
 
 static NSString * const privacyPreservingDescriptionKey = @"privacyPreservingDescription";
@@ -440,6 +444,40 @@ void callAfterRandomDelay(Function<void()>&& completionHandler)
     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, delay.nanosecondsAs<int64_t>()), dispatch_get_main_queue(), makeBlockPtr(WTFMove(completionHandler)).get());
 }
 
+NSSet *availableScreenScales()
+{
+    NSMutableSet *screenScales = [NSMutableSet set];
+
+#if USE(APPKIT)
+    for (NSScreen *screen in NSScreen.screens)
+        [screenScales addObject:@(screen.backingScaleFactor)];
+#else
+    ALLOW_DEPRECATED_DECLARATIONS_BEGIN
+    for (UIScreen *screen in UIScreen.screens)
+        [screenScales addObject:@(screen.scale)];
+    ALLOW_DEPRECATED_DECLARATIONS_END
+#endif
+
+    if (screenScales.count)
+        return [screenScales copy];
+
+    // Assume 1x if we got no results. This can happen on headless devices (bots).
+    return [NSSet setWithObject:@1];
+}
+
+CGFloat largestDisplayScale()
+{
+    auto largestDisplayScale = 1.0;
+
+    for (NSNumber *scale in availableScreenScales()) {
+        auto scaleValue = scale.doubleValue;
+        if (scaleValue > largestDisplayScale)
+            largestDisplayScale = scaleValue;
+    }
+
+    return largestDisplayScale;
+}
+
 NSDate *toAPI(const WallTime& time)
 {
     if (time.isNaN())

Source/WebKit/Platform/spi/ios/UIKitSPI.h

@@ -45,6 +45,7 @@
 #import <UIKit/UIFont_Private.h>
 #import <UIKit/UIGeometry_Private.h>
 #import <UIKit/UIGestureRecognizer_Private.h>
+#import <UIKit/UIImageAsset_Private.h>
 #import <UIKit/UIImagePickerController_Private.h>
 #import <UIKit/UIImage_Private.h>
 #import <UIKit/UIInterface_Private.h>
@@ -338,13 +339,18 @@ typedef enum {
 @property (nonatomic, setter=_setShowsFileSizePicker:) BOOL _showsFileSizePicker;
 @end
 
+@interface UIImageAsset ()
++ (instancetype)_dynamicAssetNamed:(NSString *)name generator:(UIImage *(^)(UIImageAsset *, UIImageConfiguration *, UIImage *))block;
+@end
+
 typedef struct CGSVGDocument *CGSVGDocumentRef;
 
 @interface UIImage ()
 - (id)initWithCGImage:(CGImageRef)CGImage imageOrientation:(UIImageOrientation)imageOrientation;
 - (UIImage *)_flatImageWithColor:(UIColor *)color;
 + (UIImage *)_systemImageNamed:(NSString *)name;
 + (UIImage *)_imageWithCGSVGDocument:(CGSVGDocumentRef)cgSVGDocument;
++ (UIImage *)_imageWithCGSVGDocument:(CGSVGDocumentRef)cgSVGDocument scale:(CGFloat)scale orientation:(UIImageOrientation)orientation;
 @end
 
 @protocol UIKeyboardImplGeometryDelegate
@@ -1111,6 +1117,10 @@ typedef NS_ENUM(NSUInteger, _UIScrollDeviceCategory) {
 + (UIColor *)insertionPointColor;
 @end
 
+@interface UIImage ()
+- (UIImage *)_rasterizedImage;
+@end
+
 @interface UIView (IPI)
 - (UIScrollView *)_scroller;
 - (CGPoint)accessibilityConvertPointFromSceneReferenceCoordinates:(CGPoint)point;

Source/WebKit/UIProcess/Extensions/Cocoa/WebExtensionActionCocoa.mm

@@ -646,11 +646,12 @@ - (void)_otherPopoverWillShow:(NSNotification *)notification
         return nil;
 
     if (m_customIcons) {
-        NSError *error;
-        if (CocoaImage *result = extensionContext()->extension().bestImageInIconsDictionary(m_customIcons.get(), idealSize.width > idealSize.height ? idealSize.width : idealSize.height, &error))
-            return result;
+        auto *result = extensionContext()->extension().bestImageInIconsDictionary(m_customIcons.get(), idealSize, [&](auto *error) {
+            extensionContext()->recordError(error);
+        });
 
-        extensionContext()->recordErrorIfNeeded(error);
+        if (result)
+            return result;
 
         // If custom icons fail, fallback to the default icons.
     }