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Inport initial implementation from PR unoplatform#1796
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| using System; | ||
| using System.IO; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using Android.Graphics.Pdf; | ||
| using Android.OS; | ||
| using Windows.Foundation; | ||
|
|
||
| namespace Windows.Data.Pdf; | ||
|
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| public partial class PdfDocument : IDisposable | ||
| { | ||
| private readonly PdfRenderer _pdfRenderer; | ||
|
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| private PdfDocument(PdfRenderer pdfRenderer) | ||
| { | ||
| this._pdfRenderer = pdfRenderer ?? throw new ArgumentNullException(nameof(pdfRenderer)); | ||
| } | ||
|
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| public bool IsPasswordProtected => false; | ||
|
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| public uint PageCount => (uint)_pdfRenderer.PageCount; | ||
|
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| public PdfPage GetPage(uint pageIndex) | ||
| { | ||
| if (pageIndex >= _pdfRenderer.PageCount) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(pageIndex), $"In this document the page index cannot be {pageIndex}. Page count is {_pdfRenderer.PageCount}"); | ||
| } | ||
|
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| var pdfPage = _pdfRenderer.OpenPage((int)pageIndex); | ||
| return new PdfPage(pdfPage); | ||
| } | ||
|
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| public static IAsyncOperation<PdfDocument> LoadFromFileAsync(Storage.IStorageFile file) | ||
| { | ||
| return LoadFromFileAsync(file, null); | ||
| } | ||
|
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| public static IAsyncOperation<PdfDocument> LoadFromFileAsync(Storage.IStorageFile file, string password) | ||
| { | ||
| if (!string.IsNullOrEmpty(password)) | ||
| { | ||
| // password protected PDF files are not supported by PdfRenderer in Android | ||
| throw new NotImplementedException("The member IAsyncOperation<PdfDocument> PdfDocument.LoadFromFileAsync(IStorageFile file, string password) is not implemented in Uno."); | ||
| } | ||
|
|
||
| if (file is null) | ||
| { | ||
| throw new ArgumentNullException(nameof(file)); | ||
| } | ||
|
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| var localpath = file.Path; | ||
| var fileDescriptor = localpath.StartsWith('/') | ||
| ? ParcelFileDescriptor.Open(new Java.IO.File(localpath), ParcelFileMode.ReadOnly) | ||
| : Android.App.Application.Context.ContentResolver.OpenFileDescriptor(Android.Net.Uri.Parse(localpath), "r"); | ||
| var pdfRenderer = new PdfRenderer(fileDescriptor); | ||
| var pdfDocument = new PdfDocument(pdfRenderer); | ||
|
|
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| return Task.FromResult(pdfDocument).AsAsyncOperation(); | ||
| } | ||
|
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| public static IAsyncOperation<PdfDocument> LoadFromStreamAsync(Storage.Streams.IRandomAccessStream inputStream) | ||
| { | ||
| return LoadFromStreamAsync(inputStream, default); | ||
| } | ||
|
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| public static IAsyncOperation<PdfDocument> LoadFromStreamAsync(Storage.Streams.IRandomAccessStream inputStream, string password) | ||
| { | ||
| if (!string.IsNullOrEmpty(password)) | ||
| { | ||
| // password protected PDF files are not supported by PdfRenderer in Android | ||
| throw new NotImplementedException("The member IAsyncOperation<PdfDocument> PdfDocument.LoadFromStreamAsync(IRandomAccessStream inputStream, string password) is not implemented in Uno."); | ||
| } | ||
| return AsyncOperation.FromTask(async ct => | ||
| { | ||
| var parcel = await GetParcelFileDescriptorFromStreamAsync(inputStream.AsStream(), ct); | ||
| var pdfRenderer = new PdfRenderer(parcel); | ||
| var pdfDocument = new PdfDocument(pdfRenderer); | ||
| return pdfDocument; | ||
| }); | ||
| } | ||
|
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| public void Dispose() | ||
| { | ||
| _pdfRenderer.Dispose(); | ||
| } | ||
|
|
||
| private static Task<ParcelFileDescriptor> GetParcelFileDescriptorFromStreamAsync(Stream input, CancellationToken token) => | ||
| Task.Run(() => | ||
| { | ||
| /* PdfRenderer https://developer.android.com/reference/android/graphics/pdf/PdfRenderer#PdfRenderer(android.os.ParcelFileDescriptor) | ||
| * PdfRenderer needs a seek-able ParcelFileDescriptor, | ||
| * to get it from a stream (without using hacks), | ||
| * you need to copy the stream to a temporary file. | ||
| */ | ||
| var fileName = Path.GetTempFileName(); | ||
| var file = new Java.IO.File(fileName); | ||
| file.DeleteOnExit(); | ||
| using var outputStream = new Java.IO.FileOutputStream(file); | ||
| byte[] buf = new byte[4096]; | ||
| var len = 0; | ||
| while (!token.IsCancellationRequested && (len = input.Read(buf, 0, buf.Length)) > 0) | ||
| { | ||
| outputStream.Write(buf, 0, len); | ||
| } | ||
| outputStream.Flush(); | ||
| outputStream.Close(); | ||
| return ParcelFileDescriptor.Open(file, ParcelFileMode.ReadOnly); | ||
| }, token); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| using System; | ||
| using System.IO; | ||
| using System.Threading.Tasks; | ||
| using Android.Graphics; | ||
| using Android.Graphics.Pdf; | ||
| using Uno; | ||
| using Windows.Foundation; | ||
| using Windows.Storage.Streams; | ||
| using Windows.UI; | ||
| using Color = Windows.UI.Color; | ||
| using Rect = Windows.Foundation.Rect; | ||
|
|
||
| namespace Windows.Data.Pdf; | ||
|
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||
| public partial class PdfPage : IDisposable | ||
| { | ||
| private readonly PdfRenderer.Page _pdfPage; | ||
| // It is an empirical value found by rendering through RenderTargetBitmap | ||
| // in png and comparing the dimensions of the images thus obtained. | ||
| private const float pointToPixelFactor = 96.00000000f / 72.00000000f; | ||
|
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| internal PdfPage(PdfRenderer.Page pdfPage) | ||
| { | ||
| _pdfPage = pdfPage ?? throw new ArgumentNullException(nameof(pdfPage)); | ||
| } | ||
|
|
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| [NotImplemented("__ANDROID__")] | ||
| public PdfPageDimensions Dimensions { get; } = new PdfPageDimensions(); | ||
|
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| public uint Index => (uint)_pdfPage.Index; | ||
|
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| public Size Size => new Size(Math.Ceiling(_pdfPage.Width * pointToPixelFactor) + double.Epsilon, Math.Ceiling(_pdfPage.Height * pointToPixelFactor) + double.Epsilon); | ||
|
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| public IAsyncAction RenderToStreamAsync(IRandomAccessStream outputStream) | ||
| { | ||
| if (outputStream is null) | ||
| { | ||
| throw new ArgumentNullException(nameof(outputStream)); | ||
| } | ||
| var size = Size; | ||
| var options = new PdfPageRenderOptions | ||
| { | ||
| DestinationWidth = (uint)size.Width, | ||
| DestinationHeight = (uint)size.Height | ||
| }; | ||
| return RenderToStreamAsync(outputStream, options); | ||
| } | ||
|
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| public IAsyncAction RenderToStreamAsync(IRandomAccessStream outputStream, PdfPageRenderOptions options) | ||
| { | ||
| #region Validate arguments | ||
| if (outputStream is null) | ||
| { | ||
| throw new ArgumentNullException(nameof(outputStream)); | ||
| } | ||
| if (options is null) | ||
| { | ||
| throw new ArgumentNullException(nameof(options)); | ||
| } | ||
| if (options.DestinationWidth > int.MaxValue) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(options), $"PdfPageRenderOptions.DestinationWidth = {options.DestinationWidth}. Must be less than or equal to int.MaxValue"); | ||
| } | ||
| if (options.DestinationHeight > int.MaxValue) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(options), $"PdfPageRenderOptions.DestinationHeight = {options.DestinationHeight}. Must be less than or equal to int.MaxValue"); | ||
| } | ||
| #endregion | ||
|
|
||
| return Task.Run(() => | ||
| { | ||
| const int quality = 100; | ||
| var bitmap = RenderInternal(options); | ||
| bitmap.Compress(Bitmap.CompressFormat.Png, quality, outputStream.AsStream()); | ||
| bitmap.Dispose(); | ||
| }).AsAsyncAction(); | ||
| } | ||
|
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| private Bitmap RenderInternal(PdfPageRenderOptions options) | ||
| { | ||
| var destination = new Size(options.DestinationWidth, options.DestinationHeight); | ||
|
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| var sourceRect = options.SourceRect; | ||
| #region handle 0-width and 0-height | ||
| if (destination.Width == 0 && destination.Height == 0) | ||
| { | ||
| // destination size not set - render with the page original size | ||
| destination = Size; | ||
| } | ||
| else if (destination.Width == 0) | ||
| { | ||
| // destination width not set - calculate it based on height proportion | ||
| var scale = destination.Height / Size.Height; | ||
| destination = new Size(Size.Width * scale, destination.Height); | ||
| } | ||
| else if (destination.Height == 0) | ||
| { | ||
| // destination height not set - calculate it based on width proportion | ||
| var scale = destination.Width / Size.Width; | ||
| destination = new Size(destination.Width, Size.Height * scale); | ||
| } | ||
| #endregion | ||
|
|
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| #region scale according to DPI | ||
| destination = new Size(destination.Width, destination.Height); | ||
| #endregion | ||
|
|
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| #region create bitmap | ||
| var bitmap = Bitmap.CreateBitmap((int)destination.Width, (int)destination.Height, Bitmap.Config.Argb8888); | ||
| RectF destinationRect = new Rect(new Foundation.Point(), destination); | ||
| #endregion | ||
|
|
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| #region fill with background color | ||
| using (var canvas = new Canvas(bitmap)) | ||
| { | ||
| var color = options.BackgroundColor.Equals(default(Color)) ? Colors.White : options.BackgroundColor; | ||
| canvas.DrawRect(destinationRect, new Paint() | ||
| { | ||
| Color = color | ||
| }); | ||
| } | ||
| #endregion | ||
|
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| // Render content | ||
| _pdfPage.Render(bitmap, null, null, PdfRenderMode.ForDisplay); | ||
|
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| if (sourceRect.Width > 0 && sourceRect.Height > 0) | ||
| { | ||
| using var oldbitmap = bitmap; | ||
| bitmap = Bitmap.CreateBitmap(oldbitmap, (int)sourceRect.X, (int)sourceRect.Y, (int)sourceRect.Width, (int)sourceRect.Height, null, false); | ||
| } | ||
|
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| return bitmap; | ||
| } | ||
|
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| public IAsyncAction PreparePageAsync() => | ||
| Task.CompletedTask.AsAsyncAction(); | ||
|
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| public void Dispose() | ||
| { | ||
| _pdfPage.Close(); | ||
| _pdfPage.Dispose(); | ||
| } | ||
| } |
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