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init (#88427)

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nt4f04uNd 2021-08-21 00:57:03 +03:00 committed by GitHub
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57
packages/flutter_test/lib/src/image.dart
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@ -6,7 +6,6 @@ import 'dart:async';
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/painting.dart';
import 'test_async_utils.dart';
@ -49,13 +48,6 @@ Future<ui.Image> createTestImage({
});
Future<ui.Image> _createImage(int width, int height) async {
if (kIsWeb) {
return _webCreateTestImage(
width: width,
height: height,
);
}
final Completer<ui.Image> completer = Completer<ui.Image>();
ui.decodeImageFromPixels(
Uint8List.fromList(List<int>.filled(width * height * 4, 0, growable: false)),
@ -68,52 +60,3 @@ Future<ui.Image> _createImage(int width, int height) async {
);
return completer.future;
}
/// Web doesn't support [decodeImageFromPixels]. Instead, generate a 1bpp BMP
/// and just use [instantiateImageCodec].
// TODO(dnfield): Remove this when https://github.com/flutter/flutter/issues/49244
// is resolved.
Future<ui.Image> _webCreateTestImage({
required int width,
required int height,
}) async {
// See https://en.wikipedia.org/wiki/BMP_file_format for format examples.
final int bufferSize = 0x36 + (width * height);
final ByteData bmpData = ByteData(bufferSize);
// 'BM' header
bmpData.setUint8(0x00, 0x42);
bmpData.setUint8(0x01, 0x4D);
// Size of data
bmpData.setUint32(0x02, bufferSize, Endian.little);
// Offset where pixel array begins
bmpData.setUint32(0x0A, 0x36, Endian.little);
// Bytes in DIB header
bmpData.setUint32(0x0E, 0x28, Endian.little);
// width
bmpData.setUint32(0x12, width, Endian.little);
// height
bmpData.setUint32(0x16, height, Endian.little);
// Color panes
bmpData.setUint16(0x1A, 0x01, Endian.little);
// bpp
bmpData.setUint16(0x1C, 0x01, Endian.little);
// no compression
bmpData.setUint32(0x1E, 0x00, Endian.little);
// raw bitmap data size
bmpData.setUint32(0x22, width * height, Endian.little);
// print DPI width
bmpData.setUint32(0x26, width, Endian.little);
// print DPI height
bmpData.setUint32(0x2A, height, Endian.little);
// colors in the palette
bmpData.setUint32(0x2E, 0x00, Endian.little);
// important colors
bmpData.setUint32(0x32, 0x00, Endian.little);
// rest of data is zeroed as black pixels.
final ui.Codec codec = await ui.instantiateImageCodec(
bmpData.buffer.asUint8List(),
);
final ui.FrameInfo frameInfo = await codec.getNextFrame();
return frameInfo.image;
}