Flutter Web, toByteData, await never returns #44908
Description
Steps to Reproduce
I have this demostrative code:
import 'dart:convert';
import 'dart:ui';
void main() async {
final pictureRecorder = PictureRecorder();
Canvas(pictureRecorder).drawCircle(
const Offset(100, 100),
100,
Paint()..color = const Color.fromARGB(255, 255, 0, 0),
);
final picture = pictureRecorder.endRecording();
final image = await picture.toImage(200, 200);
print('//1 before toByteData await');
final rawByteData = await image.toByteData(format: ImageByteFormat.rawRgba);
print('//2 after toByteData await');
final encoded = base64.encode(rawByteData.buffer.asUint8List());
print('//3 base64: $encoded');
}
The result on a mobile is, as expected:
I/flutter (18489): //1 before toByteData await
I/flutter (18489): //2 after toByteData await
I/flutter (18489): //3 base64: AAAAAAAAAAAAAAAAAAAAAA... (all the base64 string)
The result on a Chrome Web:
//1 before toByteData await
And never return the result, can somebody explainme how can I get the result in web?
Thank you very much for your time sharing your knowledge!
Target Platform: Web
Logs
flutter run -d chrome --verbose
[ +42 ms] executing: [/Users/danielcardona/developer/flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +64 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[ ] c90d64b619d674bdca955b94058db01906781819
[ ] executing: [/Users/danielcardona/developer/flutter/] git describe --match v*.*.* --first-parent --long --tags
[ +67 ms] Exit code 0 from: git describe --match v*.*.* --first-parent --long --tags
[ ] v1.11.0-49-gc90d64b61
[ +14 ms] executing: [/Users/danielcardona/developer/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[ +16 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[ ] origin/master
[ ] executing: [/Users/danielcardona/developer/flutter/] git ls-remote --get-url origin
[ +16 ms] Exit code 0 from: git ls-remote --get-url origin
[ ] https://github.com/flutter/flutter.git
[ +91 ms] executing: [/Users/danielcardona/developer/flutter/] git rev-parse --abbrev-ref HEAD
[ +23 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[ ] master
[ +19 ms] executing: sw_vers -productName
[ +29 ms] Exit code 0 from: sw_vers -productName
[ ] Mac OS X
[ ] executing: sw_vers -productVersion
[ +25 ms] Exit code 0 from: sw_vers -productVersion
[ ] 10.14.6
[ ] executing: sw_vers -buildVersion
[ +22 ms] Exit code 0 from: sw_vers -buildVersion
[ ] 18G1012
[ +52 ms] executing: /usr/bin/xcode-select --print-path
[ +19 ms] Exit code 0 from: /usr/bin/xcode-select --print-path
[ ] /Applications/Xcode.app/Contents/Developer
[ +2 ms] executing: /usr/bin/xcodebuild -version
[ +288 ms] Exit code 0 from: /usr/bin/xcodebuild -version
[ +5 ms] Xcode 11.2.1
Build version 11B53
[ +101 ms] executing: /Users/danielcardona/Library/Android/sdk/platform-tools/adb devices -l
[ +11 ms] Exit code 0 from: /Users/danielcardona/Library/Android/sdk/platform-tools/adb devices -l
[ ] List of devices attached
[ +28 ms] executing: /Users/danielcardona/developer/flutter/bin/cache/artifacts/libimobiledevice/idevice_id -h
[ +75 ms] /usr/bin/xcrun simctl list --json devices
[ +223 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[ +10 ms] executing: zip -T
/Users/danielcardona/developer/flutter/bin/cache/downloads/storage.googleapis.com/flutter_infra/flutter/7c2a4ec97f9f92f96df0115d2ae92d854e16d9c3/fl
utter-web-sdk-darwin-x64.zip
[ +15 ms] Downloading Web SDK...
[ +15 ms] Downloading:
https://storage.googleapis.com/flutter_infra/flutter/7c2a4ec97f9f92f96df0115d2ae92d854e16d9c3/flutter-web-sdk-darwin-x64.zip
[ +325 ms] Received response from server, collecting bytes...
[ +824 ms] Downloading Web SDK... (completed in 1.1s)
[ ] executing: unzip -o -q
/Users/danielcardona/developer/flutter/bin/cache/downloads/storage.googleapis.com/flutter_infra/flutter/7c2a4ec97f9f92f96df0115d2ae92d854e16d9c3/fl
utter-web-sdk-darwin-x64.zip -d /Users/danielcardona/developer/flutter/bin/cache/flutter_web_sdk
[ +528 ms] Exit code 0 from: unzip -o -q
/Users/danielcardona/developer/flutter/bin/cache/downloads/storage.googleapis.com/flutter_infra/flutter/7c2a4ec97f9f92f96df0115d2ae92d854e16d9c3/fl
utter-web-sdk-darwin-x64.zip -d /Users/danielcardona/developer/flutter/bin/cache/flutter_web_sdk
[+1660 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +284 ms] Generating /Users/danielcardona/Flutter/Proyectos/prova/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
⣽[ +209 ms] executing: [/Users/danielcardona/Flutter/Proyectos/prova/ios/Runner.xcodeproj/] /usr/bin/xcodebuild -project
/Users/danielcardona/Flutter/Proyectos/prova/ios/Runner.xcodeproj -target Runner -showBuildSettings
[ +1 ms] executing: [/Users/danielcardona/Flutter/Proyectos/prova/ios/Runner.xcodeproj/] /usr/bin/xcodebuild -project
/Users/danielcardona/Flutter/Proyectos/prova/ios/Runner.xcodeproj -target Runner -showBuildSettings
(This is taking an unexpectedly long time.)⣷[+3078 ms] Build settings for action build and target Runner:
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PLIST_FILE_OUTPUT_FORMAT = binary
PLUGINS_FOLDER_PATH = Runner.app/PlugIns
PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = YES
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/Users/danielcardona/Flutter/Proyectos/prova/build/ios/Runner.build/Release-iphoneos/Runner.build/PrefixHeaders
PRESERVE_DEAD_CODE_INITS_AND_TERMS = NO
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PRODUCT_BUNDLE_IDENTIFIER = becode.prova
PRODUCT_BUNDLE_PACKAGE_TYPE = APPL
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PRODUCT_SETTINGS_PATH = /Users/danielcardona/Flutter/Proyectos/prova/ios/Runner/Info.plist
PRODUCT_TYPE = com.apple.product-type.application
PROFILING_CODE = NO
PROJECT = Runner
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PROJECT_FILE_PATH = /Users/danielcardona/Flutter/Proyectos/prova/ios/Runner.xcodeproj
PROJECT_NAME = Runner
PROJECT_TEMP_DIR = /Users/danielcardona/Flutter/Proyectos/prova/build/ios/Runner.build
PROJECT_TEMP_ROOT = /Users/danielcardona/Flutter/Proyectos/prova/build/ios
PROVISIONING_PROFILE_REQUIRED = YES
PUBLIC_HEADERS_FOLDER_PATH = Runner.app/Headers
RECURSIVE_SEARCH_PATHS_FOLLOW_SYMLINKS = YES
REMOVE_CVS_FROM_RESOURCES = YES
REMOVE_GIT_FROM_RESOURCES = YES
REMOVE_HEADERS_FROM_EMBEDDED_BUNDLES = YES
REMOVE_HG_FROM_RESOURCES = YES
REMOVE_SVN_FROM_RESOURCES = YES
RESOURCE_RULES_REQUIRED = YES
REZ_COLLECTOR_DIR =
/Users/danielcardona/Flutter/Proyectos/prova/build/ios/Runner.build/Release-iphoneos/Runner.build/ResourceManagerResources
REZ_OBJECTS_DIR =
/Users/danielcardona/Flutter/Proyectos/prova/build/ios/Runner.build/Release-iphoneos/Runner.build/ResourceManagerResources/
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SCAN_ALL_SOURCE_FILES_FOR_INCLUDES = NO
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SDK_DIR_iphoneos13_2 =
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SDK_NAME = iphoneos13.2
SDK_NAMES = iphoneos13.2
SDK_PRODUCT_BUILD_VERSION = 17B102
SDK_VERSION = 13.2
SDK_VERSION_ACTUAL = 130200
SDK_VERSION_MAJOR = 130000
SDK_VERSION_MINOR = 200
SED = /usr/bin/sed
SEPARATE_STRIP = NO
SEPARATE_SYMBOL_EDIT = NO
SET_DIR_MODE_OWNER_GROUP = YES
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SHARED_DERIVED_FILE_DIR = /Users/danielcardona/Flutter/Proyectos/prova/build/ios/Release-iphoneos/DerivedSources
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SHARED_PRECOMPS_DIR = /Users/danielcardona/Flutter/Proyectos/prova/build/ios/SharedPrecompiledHeaders
SHARED_SUPPORT_FOLDER_PATH = Runner.app/SharedSupport
SKIP_INSTALL = NO
SOURCE_ROOT = /Users/danielcardona/Flutter/Proyectos/prova/ios
SRCROOT = /Users/danielcardona/Flutter/Proyectos/prova/ios
STRINGS_FILE_OUTPUT_ENCODING = binary
STRIP_BITCODE_FROM_COPIED_FILES = YES
STRIP_INSTALLED_PRODUCT = YES
STRIP_STYLE = all
STRIP_SWIFT_SYMBOLS = YES
SUPPORTED_DEVICE_FAMILIES = 1,2
SUPPORTED_PLATFORMS = iphoneos
SUPPORTS_MACCATALYST = NO
SUPPORTS_TEXT_BASED_API = NO
SWIFT_COMPILATION_MODE = wholemodule
SWIFT_OBJC_BRIDGING_HEADER = Runner/Runner-Bridging-Header.h
SWIFT_OPTIMIZATION_LEVEL = -O
SWIFT_PLATFORM_TARGET_PREFIX = ios
SWIFT_VERSION = 4.0
SYMROOT = /Users/danielcardona/Flutter/Proyectos/prova/build/ios
SYSTEM_ADMIN_APPS_DIR = /Applications/Utilities
SYSTEM_APPS_DIR = /Applications
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SYSTEM_DEVELOPER_DEMOS_DIR = /Applications/Xcode.app/Contents/Developer/Applications/Utilities/Built Examples
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SYSTEM_DEVELOPER_DOC_DIR = /Applications/Xcode.app/Contents/Developer/ADC Reference Library
SYSTEM_DEVELOPER_GRAPHICS_TOOLS_DIR = /Applications/Xcode.app/Contents/Developer/Applications/Graphics Tools
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SYSTEM_DEVELOPER_RELEASENOTES_DIR = /Applications/Xcode.app/Contents/Developer/ADC Reference Library/releasenotes
SYSTEM_DEVELOPER_TOOLS = /Applications/Xcode.app/Contents/Developer/Tools
SYSTEM_DEVELOPER_TOOLS_DOC_DIR = /Applications/Xcode.app/Contents/Developer/ADC Reference
Library/documentation/DeveloperTools
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SYSTEM_DOCUMENTATION_DIR = /Library/Documentation
SYSTEM_KEXT_INSTALL_PATH = /System/Library/Extensions
SYSTEM_LIBRARY_DIR = /System/Library
TAPI_VERIFY_MODE = ErrorsOnly
TARGETED_DEVICE_FAMILY = 1,2
TARGETNAME = Runner
TARGET_BUILD_DIR = /Users/danielcardona/Flutter/Proyectos/prova/build/ios/Release-iphoneos
TARGET_NAME = Runner
TARGET_TEMP_DIR = /Users/danielcardona/Flutter/Proyectos/prova/build/ios/Runner.build/Release-iphoneos/Runner.build
TEMP_DIR = /Users/danielcardona/Flutter/Proyectos/prova/build/ios/Runner.build/Release-iphoneos/Runner.build
TEMP_FILES_DIR = /Users/danielcardona/Flutter/Proyectos/prova/build/ios/Runner.build/Release-iphoneos/Runner.build
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TEMP_ROOT = /Users/danielcardona/Flutter/Proyectos/prova/build/ios
TOOLCHAIN_DIR = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
TREAT_MISSING_BASELINES_AS_TEST_FAILURES = NO
UID = 501
UNLOCALIZED_RESOURCES_FOLDER_PATH = Runner.app
UNSTRIPPED_PRODUCT = NO
USER = danielcardona
USER_APPS_DIR = /Users/danielcardona/Applications
USER_LIBRARY_DIR = /Users/danielcardona/Library
USE_DYNAMIC_NO_PIC = YES
USE_HEADERMAP = YES
USE_HEADER_SYMLINKS = NO
USE_LLVM_TARGET_TRIPLES = YES
USE_LLVM_TARGET_TRIPLES_FOR_CLANG = YES
USE_LLVM_TARGET_TRIPLES_FOR_LD = YES
USE_LLVM_TARGET_TRIPLES_FOR_TAPI = YES
VALIDATE_PRODUCT = YES
VALIDATE_WORKSPACE = NO
VALID_ARCHS = arm64 arm64e armv7 armv7s
VERBOSE_PBXCP = NO
VERSIONING_SYSTEM = apple-generic
VERSIONPLIST_PATH = Runner.app/version.plist
VERSION_INFO_BUILDER = danielcardona
VERSION_INFO_FILE = Runner_vers.c
VERSION_INFO_STRING = "@(#)PROGRAM:Runner PROJECT:Runner-1"
WRAPPER_EXTENSION = app
WRAPPER_NAME = Runner.app
WRAPPER_SUFFIX = .app
WRAP_ASSET_PACKS_IN_SEPARATE_DIRECTORIES = NO
XCODE_APP_SUPPORT_DIR = /Applications/Xcode.app/Contents/Developer/Library/Xcode
XCODE_PRODUCT_BUILD_VERSION = 11B53
XCODE_VERSION_ACTUAL = 1121
XCODE_VERSION_MAJOR = 1100
XCODE_VERSION_MINOR = 1120
XPCSERVICES_FOLDER_PATH = Runner.app/XPCServices
YACC = yacc
arch = arm64
variant = normal [ +122 ms] Launching lib/main.dart on Chrome in debug mode...
[ ] Building application for the web...
[+14832 ms] Starting daemon...
[ +277 ms] Initializing inputs
[ +30 ms] Reading cached asset graph...
[ +371 ms] Throwing away cached asset graph because the build phases have changed. This most commonly would happen as a result of adding a new
dependency or updating your dependencies.
[ +2 ms] Cleaning up outputs from previous builds....
[ +186 ms] Cleaning up outputs from previous builds. completed, took 180ms
[ ] Reading cached asset graph completed, took 558ms
[ +270 ms] Building new asset graph...
[+1186 ms] Building new asset graph completed, took 1.2s
[ ] Checking for unexpected pre-existing outputs....
[ +1 ms] Checking for unexpected pre-existing outputs. completed, took 2ms
[ +17 ms] Initializing inputs
[ +4 ms] Reading cached asset graph...
[ +1 ms] Throwing away cached asset graph because the build phases have changed. This most commonly would happen as a result of adding a new
dependency or
updating your dependencies.
[ +3 ms] Cleaning up outputs from previous builds....
[ ] Cleaning up outputs from previous builds. completed, took 180ms
[ ] Reading cached asset graph completed, took 558ms
[ ] Building new asset graph...
[ ] Building new asset graph completed, took 1.2s
[ ] Checking for unexpected pre-existing outputs....
[ ] Checking for unexpected pre-existing outputs. completed, took 2ms
[ +233 ms] Serving DevTools at http://127.0.0.1:63246
[+1156 ms] About to build [web]...
[ +9 ms] Running build...
[+1042 ms] 1.1s elapsed, 54/74 actions completed.
[+1027 ms] 2.1s elapsed, 214/222 actions completed.
[+1002 ms] 3.1s elapsed, 381/398 actions completed.
[+1104 ms] 4.2s elapsed, 573/577 actions completed.
[+1092 ms] 5.3s elapsed, 574/577 actions completed.
[ +675 ms] Running build completed, took 5.8s
[ ] Caching finalized dependency graph...
[ +4 ms] Caching finalized dependency graph completed, took 141ms
[ +8 ms] Succeeded after 6.0s with 495 outputs (1063 actions)
[ +1 ms] Building application for the web... (completed in 24.5s)
[ ] Attempting to connect to browser instance..
[+3396 ms] Debug service listening on ws://127.0.0.1:63285/dehjQUNHlq4=
[ +196 ms] Failed to load asset at path: packages/build_web_compilers/src/dev_compiler/dart_sdk.js.
Status code: 404
Headers:
{
"date": "Thu, 14 Nov 2019 12:11:40 GMT",
"content-length": "9",
"x-frame-options": "SAMEORIGIN",
"content-type": "text/plain; charset=utf-8",
"x-xss-protection": "1; mode=block",
"x-content-type-options": "nosniff",
"server": "dart:io with Shelf",
"via": "1.1 shelf_proxy"
}
Content:
Not Found}
[ +25 ms] Attempting to connect to browser instance.. (completed in 3.6s)
[ +1 ms] Warning: Flutter's support for web development is not stable yet and hasn't
[ ] been thoroughly tested in production environments.
[ ] For more information see https://flutter.dev/web
[ ] 🔥 To hot restart changes while running, press "r". To hot restart (and refresh the browser), press "R".
[ +1 ms] For a more detailed help message, press "h". To quit, press "q".
[ +15 ms] Debug service listening on ws://127.0.0.1:63285/dehjQUNHlq4=
[ +379 ms] //1 before toByteData await
flutter analyze
Running "flutter pub get" in prova... 0.7s
Analyzing prova...
No issues found! (ran in 3.4s)
flutter doctor -v
[✓] Flutter (Channel master, v1.11.1-pre.49, on Mac OS X 10.14.6 18G1012, locale en-ES)
• Flutter version 1.11.1-pre.49 at /Users/danielcardona/developer/flutter
• Framework revision c90d64b619 (6 hours ago), 2019-11-14 01:16:17 -0500
• Engine revision 7c2a4ec97f
• Dart version 2.7.0
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at /Users/danielcardona/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 11.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.2.1, Build version 11B53
• CocoaPods version 1.8.4
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio
• Android Studio at /Applications/Android Studio 3.6 Preview.app/Contents
• Flutter plugin version 38.2.3
• Dart plugin version 191.8369
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[✓] Android Studio (version 3.5)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 41.1.2
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[✓] VS Code (version 1.40.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.6.0
[✓] Connected device (2 available)
• Chrome • chrome • web-javascript • Google Chrome 78.0.3904.97
• Web Server • web-server • web-javascript • Flutter Tools
• No issues found!