50 lines
1.2 KiB
Dart
50 lines
1.2 KiB
Dart
import 'dart:typed_data';
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import 'dart:ui' as ui;
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Future<ui.Image> decodeImageFromPixels(
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Uint8List pixels,
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int width,
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int height,
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ui.PixelFormat format, {
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int? rowBytes,
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int? targetWidth,
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int? targetHeight,
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bool allowUpscaling = true,
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}) async {
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if (targetWidth != null) {
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assert(allowUpscaling || targetWidth <= width);
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}
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if (targetHeight != null) {
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assert(allowUpscaling || targetHeight <= height);
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}
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final ui.ImmutableBuffer buffer =
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await ui.ImmutableBuffer.fromUint8List(pixels);
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final ui.ImageDescriptor descriptor = ui.ImageDescriptor.raw(
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buffer,
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width: width,
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height: height,
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rowBytes: rowBytes,
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pixelFormat: format,
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);
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if (!allowUpscaling) {
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if (targetWidth != null && targetWidth > descriptor.width) {
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targetWidth = descriptor.width;
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}
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if (targetHeight != null && targetHeight > descriptor.height) {
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targetHeight = descriptor.height;
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}
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}
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final ui.Codec codec = await descriptor.instantiateCodec(
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targetWidth: targetWidth,
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targetHeight: targetHeight,
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);
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final ui.FrameInfo frameInfo = await codec.getNextFrame();
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codec.dispose();
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buffer.dispose();
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descriptor.dispose();
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return frameInfo.image;
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}
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