| Flutter iOS Embedder |

Macros | Functions | Variables
FlutterDartProject.mm File Reference
`#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterDartProject_Internal.h"`
`#import <Metal/Metal.h>`
`#import <UIKit/UIKit.h>`
`#include <sstream>`
`#include "flutter/common/constants.h"`
`#include "flutter/fml/build_config.h"`
`#include "flutter/shell/common/switches.h"`
`#import "flutter/shell/platform/darwin/common/InternalFlutterSwiftCommon/InternalFlutterSwiftCommon.h"`
`#include "flutter/shell/platform/darwin/common/command_line.h"`

Go to the source code of this file.

## Macros
#define | FML_USED_ON_EMBEDDER

## Functions
static BOOL | DoesHardwareSupportWideGamut ()
flutter::Settings | FLTDefaultSettingsForBundle (NSBundle *bundle, NSProcessInfo *processInfoOrNil)

## Variables
FLUTTER_ASSERT_ARC const 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 32 of file FlutterDartProject.mm.

32 {
33 static BOOL result = NO;
34 static dispatch_once_t once_token = 0;
35 dispatch_once(&once_token, ^{
36 id<MTLDevice> device = MTLCreateSystemDefaultDevice();
37 result = [device supportsFamily:MTLGPUFamilyApple2];
38 });
39 return result;
40 }

Referenced by FlutterDartProject::defaultBundleIdentifier.

## ◆ FLTDefaultSettingsForBundle()

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

Definition at line 42 of file FlutterDartProject.mm.

42 {
43 auto command_line = flutter::CommandLineFromNSProcessInfo(processInfoOrNil);
44
45 // Precedence:
46 // 1. Settings from the specified NSBundle.
47 // 2. Settings passed explicitly via command-line arguments.
48 // 3. Settings from the NSBundle with the default bundle ID.
49 // 4. Settings from the main NSBundle and default values.
50
51 NSBundle* mainBundle = FLTGetApplicationBundle();
52 NSBundle* engineBundle = [NSBundle bundleForClass:[FlutterDartProject class]];
53
54 bool hasExplicitBundle = bundle != nil;
55 if (bundle == nil) {
56 bundle = FLTFrameworkBundleWithIdentifier([FlutterDartProject defaultBundleIdentifier]);
57 }
58
59 auto settings = flutter::SettingsFromCommandLine(command_line);
60
61 settings.task_observer_add = [](intptr_t key, const fml::closure& callback) {
62 fml::TaskQueueId queue_id = fml::MessageLoop::GetCurrentTaskQueueId();
63 fml::MessageLoopTaskQueues::GetInstance()->AddTaskObserver(queue_id, key, callback);
64 return queue_id;
65 };
66
67 settings.task_observer_remove = [](fml::TaskQueueId queue_id, intptr_t key) {
68 fml::MessageLoopTaskQueues::GetInstance()->RemoveTaskObserver(queue_id, key);
69 };
70
71 settings.log_message_callback = [](const std::string& tag, const std::string& message) {
72 std::stringstream stream;
73 if (!tag.empty()) {
74 stream << tag << ": ";
75 }
76 stream << message;
77 std::string log = stream.str();
78 [FlutterLogger logDirect:[NSString stringWithUTF8String:log.c_str()]];
79 };
80
81 settings.enable_platform_isolates = true;
82
83 // The command line arguments may not always be complete. If they aren't, attempt to fill in
84 // defaults.
85
86 // Flutter ships the ICU data file in the bundle of the engine. Look for it there.
87 if (settings.icu_data_path.empty()) {
88 NSString* icuDataPath = [engineBundle pathForResource:@"icudtl" ofType:@"dat"];
89 if (icuDataPath.length > 0) {
90 settings.icu_data_path = icuDataPath.UTF8String;
91 }
92 }
93
94 if (flutter::DartVM::IsRunningPrecompiledCode()) {
95 if (hasExplicitBundle) {
96 NSString* executablePath = bundle.executablePath;
97 if ([[NSFileManager defaultManager] fileExistsAtPath:executablePath]) {
98 settings.application_library_path.push_back(executablePath.UTF8String);
99 }
100 }
101
102 // No application bundle specified. Try a known location from the main bundle's Info.plist.
103 if (settings.application_library_path.empty()) {
104 NSString* libraryName = [mainBundle objectForInfoDictionaryKey:@"FLTLibraryPath"];
105 NSString* libraryPath = [mainBundle pathForResource:libraryName ofType:@""];
106 if (libraryPath.length > 0) {
107 NSString* executablePath = [NSBundle bundleWithPath:libraryPath].executablePath;
108 if (executablePath.length > 0) {
109 settings.application_library_path.push_back(executablePath.UTF8String);
110 }
111 }
112 }
113
114 // In case the application bundle is still not specified, look for the App.framework in the
115 // Frameworks directory.
116 if (settings.application_library_path.empty()) {
117 NSString* applicationFrameworkPath = [mainBundle pathForResource:@"Frameworks/App.framework"
118 ofType:@""];
119 if (applicationFrameworkPath.length > 0) {
120 NSString* executablePath =
121 [NSBundle bundleWithPath:applicationFrameworkPath].executablePath;
122 if (executablePath.length > 0) {
123 settings.application_library_path.push_back(executablePath.UTF8String);
124 }
125 }
126 }
127 }
128
129 // Checks to see if the flutter assets directory is already present.
130 if (settings.assets_path.empty()) {
131 NSString* assetsPath = FLTAssetsPathFromBundle(bundle);
132
133 if (assetsPath.length == 0) {
134 NSLog(@"Failed to find assets path for \"%@\"", bundle);
135 } else {
136 settings.assets_path = assetsPath.UTF8String;
137
138 // Check if there is an application kernel snapshot in the assets directory we could
139 // potentially use. Looking for the snapshot makes sense only if we have a VM that can use
140 // it.
141 if (!flutter::DartVM::IsRunningPrecompiledCode()) {
142 NSURL* applicationKernelSnapshotURL =
143 [NSURL URLWithString:@(kApplicationKernelSnapshotFileName)
144 relativeToURL:[NSURL fileURLWithPath:assetsPath]];
145 NSError* error;
146 if ([applicationKernelSnapshotURL checkResourceIsReachableAndReturnError:&error]) {
147 settings.application_kernel_asset = applicationKernelSnapshotURL.path.UTF8String;
148 } else {
149 NSLog(@"Failed to find snapshot at %@: %@", applicationKernelSnapshotURL.path, error);
150 }
151 }
152 }
153 }
154
155 // Domain network configuration
156 // Disabled in https://github.com/flutter/flutter/issues/72723.
157 // Re-enable in https://github.com/flutter/flutter/issues/54448.
158 settings.may_insecurely_connect_to_all_domains = true;
159 settings.domain_network_policy = "";
160
161 // Whether to enable wide gamut colors.
162 #if TARGET_OS_SIMULATOR
163 // As of Xcode 14.1, the wide gamut surface pixel formats are not supported by
164 // the simulator.
165 settings.enable_wide_gamut = false;
166 // Removes unused function warning.
167 (void)DoesHardwareSupportWideGamut;
168 #else
169 NSNumber* nsEnableWideGamut = [mainBundle objectForInfoDictionaryKey:@"FLTEnableWideGamut"];
170 BOOL enableWideGamut =
171 (nsEnableWideGamut ? nsEnableWideGamut.boolValue : YES) && DoesHardwareSupportWideGamut();
172 settings.enable_wide_gamut = enableWideGamut;
173 #endif
174
175 NSNumber* nsAntialiasLines = [mainBundle objectForInfoDictionaryKey:@"FLTAntialiasLines"];
176 settings.impeller_antialiased_lines = (nsAntialiasLines ? nsAntialiasLines.boolValue : NO);
177
178 settings.warn_on_impeller_opt_out = true;
179
180 NSNumber* enableTraceSystrace = [mainBundle objectForInfoDictionaryKey:@"FLTTraceSystrace"];
181 // Change the default only if the option is present.
182 if (enableTraceSystrace != nil) {
183 settings.trace_systrace = enableTraceSystrace.boolValue;
184 }
185
186 NSNumber* profileMicrotasks = [mainBundle objectForInfoDictionaryKey:@"FLTProfileMicrotasks"];
187 // Change the default only if the option is present.
188 if (profileMicrotasks != nil) {
189 settings.profile_microtasks = profileMicrotasks.boolValue;
190 }
191
192 NSNumber* enableDartAsserts = [mainBundle objectForInfoDictionaryKey:@"FLTEnableDartAsserts"];
193 if (enableDartAsserts != nil) {
194 settings.dart_flags.push_back("--enable-asserts");
195 }
196
197 NSNumber* enableDartProfiling = [mainBundle objectForInfoDictionaryKey:@"FLTEnableDartProfiling"];
198 // Change the default only if the option is present.
199 if (enableDartProfiling != nil) {
200 settings.enable_dart_profiling = enableDartProfiling.boolValue;
201 }
202
203 // Leak Dart VM settings, set whether leave or clean up the VM after the last shell shuts down.
204 NSNumber* leakDartVM = [mainBundle objectForInfoDictionaryKey:@"FLTLeakDartVM"];
205 // It will change the default leak_vm value in settings only if the key exists.
206 if (leakDartVM != nil) {
207 settings.leak_vm = leakDartVM.boolValue;
208 }
209
210 NSNumber* enableMergedPlatformUIThread =
211 [mainBundle objectForInfoDictionaryKey:@"FLTEnableMergedPlatformUIThread"];
212 if (enableMergedPlatformUIThread != nil) {
213 settings.merged_platform_ui_thread = enableMergedPlatformUIThread.boolValue
214 ? flutter::Settings::MergedPlatformUIThread::kEnabled
215 : flutter::Settings::MergedPlatformUIThread::kDisabled;
216 }
217
218 NSNumber* enableFlutterGPU = [mainBundle objectForInfoDictionaryKey:@"FLTEnableFlutterGPU"];
219 if (enableFlutterGPU != nil) {
220 settings.enable_flutter_gpu = enableFlutterGPU.boolValue;
221 }
222
223 #if FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
224 // There are no ownership concerns here as all mappings are owned by the
225 // embedder and not the engine.
226 auto make_mapping_callback = [](const uint8_t* mapping, size_t size) {
227 return [mapping, size]() { return std::make_unique<fml::NonOwnedMapping>(mapping, size); };
228 };
229
230 settings.dart_library_sources_kernel =
231 make_mapping_callback(kPlatformStrongDill, kPlatformStrongDillSize);
232 #endif // FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
233
234 // If we even support setting this e.g. from the command line or the plist,
235 // we should let the user override it.
236 // Otherwise, we want to set this to a value that will avoid having the OS
237 // kill us. On most iOS devices, that happens somewhere near half
238 // the available memory.
239 // The VM expects this value to be in megabytes.
240 if (settings.old_gen_heap_size <= 0) {
241 settings.old_gen_heap_size = std::round([NSProcessInfo processInfo].physicalMemory * .48 /
242 flutter::kMegaByteSizeInBytes);
243 }
244
245 // This is the formula Android uses.
246 // https://android.googlesource.com/platform/frameworks/base/+/39ae5bac216757bc201490f4c7b8c0f63006c6cd/libs/hwui/renderthread/CacheManager.cpp#45
247 CGFloat scale = [UIScreen mainScreen].scale;
248 CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width * scale;
249 CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height * scale;
250 settings.resource_cache_max_bytes_threshold = screenWidth * screenHeight * 12 * 4;
251
252 // Whether to enable ios embedder api.
253 NSNumber* enable_embedder_api =
254 [mainBundle objectForInfoDictionaryKey:@"FLTEnableIOSEmbedderAPI"];
255 // Change the default only if the option is present.
256 if (enable_embedder_api) {
257 settings.enable_embedder_api = enable_embedder_api.boolValue;
258 }
259
260 return settings;
261 }
kApplicationKernelSnapshotFileName
static const char * kApplicationKernelSnapshotFileName
Definition: FlutterDartProject.mm:30
kPlatformStrongDillSize
const intptr_t kPlatformStrongDillSize
kPlatformStrongDill
FLUTTER_ASSERT_ARC const uint8_t kPlatformStrongDill[]
DoesHardwareSupportWideGamut
static BOOL DoesHardwareSupportWideGamut()
Definition: FlutterDartProject.mm:32
FLTGetApplicationBundle
NSBundle * FLTGetApplicationBundle()
Definition: FlutterNSBundleUtils.mm:35
FLTFrameworkBundleWithIdentifier
NSBundle * FLTFrameworkBundleWithIdentifier(NSString *flutterFrameworkBundleID)
Definition: FlutterNSBundleUtils.mm:46
FLTAssetsPathFromBundle
NSString * FLTAssetsPathFromBundle(NSBundle *bundle)
Definition: FlutterNSBundleUtils.mm:64
FlutterDartProject
Definition: FlutterDartProject.mm:263
flutter::CommandLineFromNSProcessInfo
fml::CommandLine CommandLineFromNSProcessInfo(NSProcessInfo *processInfoOrNil=nil)
Definition: command_line.mm:13

## Variable Documentation

## ◆ kApplicationKernelSnapshotFileName

const char* kApplicationKernelSnapshotFileName = "kernel_blob.bin"
| static

Definition at line 30 of file FlutterDartProject.mm.

Referenced by FlutterDartProject::defaultBundleIdentifier.

## ◆ kPlatformStrongDill

FLUTTER_ASSERT_ARC const uint8_t kPlatformStrongDill[]
| extern

Referenced by FlutterDartProject::defaultBundleIdentifier.

## ◆ kPlatformStrongDillSize

const intptr_t kPlatformStrongDillSize
| extern

Referenced by FlutterDartProject::defaultBundleIdentifier.