#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterDartProject_Internal.h"
#import <Metal/Metal.h>
#import <UIKit/UIKit.h>
#include <syslog.h>
#include "flutter/common/constants.h"
#include "flutter/fml/build_config.h"
#include "flutter/shell/common/switches.h"
#include "flutter/shell/platform/darwin/common/command_line.h"

Macros
#define	FML_USED_ON_EMBEDDER

Functions
static BOOL	DoesHardwareSupportWideGamut ()

flutter::Settings	FLTDefaultSettingsForBundle (NSBundle bundle, NSProcessInfo processInfoOrNil)

Variables
const FLUTTER_ASSERT_ARC uint8_t	kPlatformStrongDill []

const intptr_t	kPlatformStrongDillSize

static const char *	kApplicationKernelSnapshotFileName = "kernel_blob.bin"

Macro Definition Documentation

◆ FML_USED_ON_EMBEDDER

#define FML_USED_ON_EMBEDDER

Definition at line 5 of file FlutterDartProject.mm.

Function Documentation

◆ DoesHardwareSupportWideGamut()

static BOOL DoesHardwareSupportWideGamut ( )

static

Definition at line 31 of file FlutterDartProject.mm.

                                            {
   static BOOL result = NO;
   static dispatch_once_t once_token = 0;
   dispatch_once(&once_token, ^{
     id<MTLDevice> device = MTLCreateSystemDefaultDevice();
     if (@available(iOS 13.0, *)) {
       // MTLGPUFamilyApple2 = A9/A10
       result = [device supportsFamily:MTLGPUFamilyApple2];
     } else {
       // A9/A10 on iOS 10+
       result = [device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily3_v2];
     }
   });
   return result;
 }

Referenced by FLTDefaultSettingsForBundle().

◆ FLTDefaultSettingsForBundle()

flutter::Settings FLTDefaultSettingsForBundle	(	NSBundle *	bundle,
		NSProcessInfo *	processInfoOrNil
	)

Definition at line 47 of file FlutterDartProject.mm.

                                                                                                {
   auto command_line = flutter::CommandLineFromNSProcessInfo(processInfoOrNil);
  
   // Precedence:
   // 1. Settings from the specified NSBundle (except for enable-impeller).
   // 2. Settings passed explicitly via command-line arguments.
   // 3. Settings from the NSBundle with the default bundle ID.
   // 4. Settings from the main NSBundle and default values.
  
   NSBundle* mainBundle = FLTGetApplicationBundle();
   NSBundle* engineBundle = [NSBundle bundleForClass:[FlutterDartProject class]];
  
   bool hasExplicitBundle = bundle != nil;
   if (bundle == nil) {
     bundle = FLTFrameworkBundleWithIdentifier([FlutterDartProject defaultBundleIdentifier]);
   }
  
   auto settings = flutter::SettingsFromCommandLine(command_line);
  
   settings.task_observer_add = [](intptr_t key, const fml::closure& callback) {
     fml::MessageLoop::GetCurrent().AddTaskObserver(key, callback);
   };
  
   settings.task_observer_remove = [](intptr_t key) {
     fml::MessageLoop::GetCurrent().RemoveTaskObserver(key);
   };
  
   settings.log_message_callback = [](const std::string& tag, const std::string& message) {
     // TODO(cbracken): replace this with os_log-based approach.
     // https://github.com/flutter/flutter/issues/44030
     std::stringstream stream;
     if (!tag.empty()) {
       stream << tag << ": ";
     }
     stream << message;
     std::string log = stream.str();
     syslog(LOG_ALERT, "%.*s", (int)log.size(), log.c_str());
   };
  
   settings.enable_platform_isolates = true;
  
   // The command line arguments may not always be complete. If they aren't, attempt to fill in
   // defaults.
  
   // Flutter ships the ICU data file in the bundle of the engine. Look for it there.
   if (settings.icu_data_path.empty()) {
     NSString* icuDataPath = [engineBundle pathForResource:@"icudtl" ofType:@"dat"];
     if (icuDataPath.length > 0) {
       settings.icu_data_path = icuDataPath.UTF8String;
     }
   }
  
   if (flutter::DartVM::IsRunningPrecompiledCode()) {
     if (hasExplicitBundle) {
       NSString* executablePath = bundle.executablePath;
       if ([[NSFileManager defaultManager] fileExistsAtPath:executablePath]) {
         settings.application_library_path.push_back(executablePath.UTF8String);
       }
     }
  
     // No application bundle specified.  Try a known location from the main bundle's Info.plist.
     if (settings.application_library_path.empty()) {
       NSString* libraryName = [mainBundle objectForInfoDictionaryKey:@"FLTLibraryPath"];
       NSString* libraryPath = [mainBundle pathForResource:libraryName ofType:@""];
       if (libraryPath.length > 0) {
         NSString* executablePath = [NSBundle bundleWithPath:libraryPath].executablePath;
         if (executablePath.length > 0) {
           settings.application_library_path.push_back(executablePath.UTF8String);
         }
       }
     }
  
     // In case the application bundle is still not specified, look for the App.framework in the
     // Frameworks directory.
     if (settings.application_library_path.empty()) {
       NSString* applicationFrameworkPath = [mainBundle pathForResource:@"Frameworks/App.framework"
                                                                 ofType:@""];
       if (applicationFrameworkPath.length > 0) {
         NSString* executablePath =
             [NSBundle bundleWithPath:applicationFrameworkPath].executablePath;
         if (executablePath.length > 0) {
           settings.application_library_path.push_back(executablePath.UTF8String);
         }
       }
     }
   }
  
   // Checks to see if the flutter assets directory is already present.
   if (settings.assets_path.empty()) {
     NSString* assetsPath = FLTAssetsPathFromBundle(bundle);
  
     if (assetsPath.length == 0) {
       NSLog(@"Failed to find assets path for \"%@\"", bundle);
     } else {
       settings.assets_path = assetsPath.UTF8String;
  
       // Check if there is an application kernel snapshot in the assets directory we could
       // potentially use.  Looking for the snapshot makes sense only if we have a VM that can use
       // it.
       if (!flutter::DartVM::IsRunningPrecompiledCode()) {
         NSURL* applicationKernelSnapshotURL =
             [NSURL URLWithString:@(kApplicationKernelSnapshotFileName)
                    relativeToURL:[NSURL fileURLWithPath:assetsPath]];
         NSError* error;
         if ([applicationKernelSnapshotURL checkResourceIsReachableAndReturnError:&error]) {
           settings.application_kernel_asset = applicationKernelSnapshotURL.path.UTF8String;
         } else {
           NSLog(@"Failed to find snapshot at %@: %@", applicationKernelSnapshotURL.path, error);
         }
       }
     }
   }
  
   // Domain network configuration
   // Disabled in https://github.com/flutter/flutter/issues/72723.
   // Re-enable in https://github.com/flutter/flutter/issues/54448.
   settings.may_insecurely_connect_to_all_domains = true;
   settings.domain_network_policy = "";
  
   // Whether to enable wide gamut colors.
 #if TARGET_OS_SIMULATOR
   // As of Xcode 14.1, the wide gamut surface pixel formats are not supported by
   // the simulator.
   settings.enable_wide_gamut = false;
   // Removes unused function warning.
   (void)DoesHardwareSupportWideGamut;
 #else
   NSNumber* nsEnableWideGamut = [mainBundle objectForInfoDictionaryKey:@"FLTEnableWideGamut"];
   BOOL enableWideGamut =
       (nsEnableWideGamut ? nsEnableWideGamut.boolValue : YES) && DoesHardwareSupportWideGamut();
   settings.enable_wide_gamut = enableWideGamut;
 #endif
  
   settings.warn_on_impeller_opt_out = true;
  
   NSNumber* enableTraceSystrace = [mainBundle objectForInfoDictionaryKey:@"FLTTraceSystrace"];
   // Change the default only if the option is present.
   if (enableTraceSystrace != nil) {
     settings.trace_systrace = enableTraceSystrace.boolValue;
   }
  
   NSNumber* enableDartAsserts = [mainBundle objectForInfoDictionaryKey:@"FLTEnableDartAsserts"];
   if (enableDartAsserts != nil) {
     settings.dart_flags.push_back("--enable-asserts");
   }
  
   NSNumber* enableDartProfiling = [mainBundle objectForInfoDictionaryKey:@"FLTEnableDartProfiling"];
   // Change the default only if the option is present.
   if (enableDartProfiling != nil) {
     settings.enable_dart_profiling = enableDartProfiling.boolValue;
   }
  
   // Leak Dart VM settings, set whether leave or clean up the VM after the last shell shuts down.
   NSNumber* leakDartVM = [mainBundle objectForInfoDictionaryKey:@"FLTLeakDartVM"];
   // It will change the default leak_vm value in settings only if the key exists.
   if (leakDartVM != nil) {
     settings.leak_vm = leakDartVM.boolValue;
   }
  
   NSNumber* enableMergedPlatformUIThread =
       [mainBundle objectForInfoDictionaryKey:@"FLTEnableMergedPlatformUIThread"];
   if (enableMergedPlatformUIThread != nil) {
     settings.merged_platform_ui_thread = enableMergedPlatformUIThread.boolValue;
   }
  
 #if FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
   // There are no ownership concerns here as all mappings are owned by the
   // embedder and not the engine.
   auto make_mapping_callback = [](const uint8_t* mapping, size_t size) {
     return [mapping, size]() { return std::make_unique<fml::NonOwnedMapping>(mapping, size); };
   };
  
   settings.dart_library_sources_kernel =
       make_mapping_callback(kPlatformStrongDill, kPlatformStrongDillSize);
 #endif  // FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
  
   // If we even support setting this e.g. from the command line or the plist,
   // we should let the user override it.
   // Otherwise, we want to set this to a value that will avoid having the OS
   // kill us. On most iOS devices, that happens somewhere near half
   // the available memory.
   // The VM expects this value to be in megabytes.
   if (settings.old_gen_heap_size <= 0) {
     settings.old_gen_heap_size = std::round([NSProcessInfo processInfo].physicalMemory * .48 /
                                             flutter::kMegaByteSizeInBytes);
   }
  
   // This is the formula Android uses.
   // https://android.googlesource.com/platform/frameworks/base/+/39ae5bac216757bc201490f4c7b8c0f63006c6cd/libs/hwui/renderthread/CacheManager.cpp#45
   CGFloat scale = [UIScreen mainScreen].scale;
   CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width * scale;
   CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height * scale;
   settings.resource_cache_max_bytes_threshold = screenWidth * screenHeight * 12 * 4;
  
   // Whether to enable ios embedder api.
   NSNumber* enable_embedder_api =
       [mainBundle objectForInfoDictionaryKey:@"FLTEnableIOSEmbedderAPI"];
   // Change the default only if the option is present.
   if (enable_embedder_api) {
     settings.enable_embedder_api = enable_embedder_api.boolValue;
   }
  
   return settings;
 }