2 * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
4 * Licensed under the Apache License, Version 2.0 (the License);
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an AS IS BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 using System.Collections.Generic;
19 using System.Diagnostics;
22 using System.Runtime.InteropServices;
23 using System.Threading.Tasks;
25 using static Interop.Decode;
27 namespace Tizen.Multimedia.Util
30 /// This is a base class for image decoders.
32 /// <since_tizen> 4 </since_tizen>
33 public abstract class ImageDecoder : IDisposable
35 private ImageDecoderHandle _handle;
37 private ColorSpace? _colorSpace;
39 internal ImageDecoder(ImageFormat format)
41 Create(out _handle).ThrowIfFailed("Failed to create ImageDecoder");
43 Debug.Assert(_handle != null);
49 /// Gets the image format of this decoder.
51 /// <since_tizen> 4 </since_tizen>
52 public ImageFormat InputFormat { get; }
54 private ImageDecoderHandle Handle
58 if (_handle.IsInvalid)
60 throw new ObjectDisposedException(nameof(ImageDecoder));
67 /// Sets the color-space to decode into. The default is <see cref="ColorSpace.Rgba8888"/>.
69 /// <param name="colorSpace">The value indicating color-space to decode into.</param>
70 /// <exception cref="ArgumentException"><paramref name="colorSpace"/> is invalid.</exception>
71 /// <exception cref="NotSupportedException"><paramref name="colorSpace"/> is not supported by the decoder.</exception>
72 /// <seealso cref="ImageUtil.GetSupportedColorSpaces(ImageFormat)"/>
73 /// <since_tizen> 4 </since_tizen>
74 public void SetColorSpace(ColorSpace colorSpace)
76 ValidationUtil.ValidateEnum(typeof(ColorSpace), colorSpace, nameof(ColorSpace));
78 if (ImageUtil.GetSupportedColorSpaces(InputFormat).Contains(colorSpace) == false)
80 throw new NotSupportedException($"{colorSpace.ToString()} is not supported for {InputFormat}.");
83 _colorSpace = colorSpace;
87 /// Decodes an image from the specified file.
89 /// <param name="inputFilePath">The input file path from which to decode.</param>
90 /// <returns>A task that represents the asynchronous decoding operation.</returns>
92 /// Only Graphics Interchange Format(GIF) codec returns more than one frame.<br/>
94 /// http://tizen.org/privilege/mediastorage is needed if <paramref name="inputFilePath"/> is relevant to the media storage.<br/>
95 /// http://tizen.org/privilege/externalstorage is needed if <paramref name="inputFilePath"/> is relevant to the external storage.
97 /// <exception cref="ArgumentNullException"><paramref name="inputFilePath"/> is null.</exception>
98 /// <exception cref="ArgumentException">
99 /// <paramref name="inputFilePath"/> is an empty string.<br/>
101 /// <paramref name="inputFilePath"/> is not a image file.
103 /// <exception cref="FileNotFoundException"><paramref name="inputFilePath"/> does not exists.</exception>
104 /// <exception cref="UnauthorizedAccessException">The caller does not have required permission to access the path.</exception>
105 /// <exception cref="FileFormatException">The format of <paramref name="inputFilePath"/> is not <see cref="InputFormat"/>.</exception>
106 /// <exception cref="ObjectDisposedException">The <see cref="ImageDecoder"/> has already been disposed of.</exception>
107 /// <since_tizen> 4 </since_tizen>
108 public async Task<IEnumerable<BitmapFrame>> DecodeAsync(string inputFilePath)
110 if (inputFilePath == null)
112 throw new ArgumentNullException(nameof(inputFilePath));
115 if (inputFilePath.Length == 0)
117 throw new ArgumentException("path is empty.", nameof(inputFilePath));
120 if (CheckHeader(inputFilePath) == false)
122 throw new FileFormatException("The file has an invalid header.");
125 var pathPtr = Marshal.StringToHGlobalAnsi(inputFilePath);
129 SetInputPath(Handle, pathPtr).ThrowIfFailed("Failed to set input file path for decoding");
130 return await DecodeAsync();
134 Marshal.FreeHGlobal(pathPtr);
139 /// Decodes an image from the buffer.
141 /// <param name="inputBuffer">The image buffer from which to decode.</param>
142 /// <returns>A task that represents the asynchronous decoding operation.</returns>
143 /// <remarks>Only Graphics Interchange Format(GIF) codec returns more than one frame.</remarks>
144 /// <exception cref="ArgumentNullException"><paramref name="inputBuffer"/> is null.</exception>
145 /// <exception cref="ArgumentException"><paramref name="inputBuffer"/> is an empty array.</exception>
146 /// <exception cref="FileFormatException">The format of <paramref name="inputBuffer"/> is not <see cref="InputFormat"/>.</exception>
147 /// <exception cref="ObjectDisposedException">The <see cref="ImageDecoder"/> has already been disposed of.</exception>
148 /// <since_tizen> 4 </since_tizen>
149 public Task<IEnumerable<BitmapFrame>> DecodeAsync(byte[] inputBuffer)
151 if (inputBuffer == null)
153 throw new ArgumentNullException(nameof(inputBuffer));
156 if (inputBuffer.Length == 0)
158 throw new ArgumentException("buffer is empty.", nameof(inputBuffer));
161 if (CheckHeader(inputBuffer) == false)
163 throw new FileFormatException("buffer has an invalid header.");
166 SetInputBuffer(Handle, inputBuffer, (ulong)inputBuffer.Length).
167 ThrowIfFailed("Failed to set input buffer for decoding");
169 return DecodeAsync();
172 private bool CheckHeader(byte[] input)
174 if (input.Length < Header.Length)
179 for (int i = 0; i < Header.Length; ++i)
181 if (input[i] != Header[i])
190 private bool CheckHeader(string inputFile)
192 using (var fs = File.OpenRead(inputFile))
194 byte[] fileHeader = new byte[Header.Length];
196 if (fs.Read(fileHeader, 0, fileHeader.Length) < Header.Length)
200 return CheckHeader(fileHeader);
204 internal Task<IEnumerable<BitmapFrame>> DecodeAsync()
208 IntPtr outBuffer = IntPtr.Zero;
209 SetOutputBuffer(Handle, out outBuffer).ThrowIfFailed("Failed to decode given image");
211 var tcs = new TaskCompletionSource<IEnumerable<BitmapFrame>>();
220 DecodeRun(Handle, out width, out height, out size).ThrowIfFailed("Failed to decode");
222 tcs.SetResult(new[] { new BitmapFrame(outBuffer, width, height, (int)size) });
226 tcs.TrySetException(e);
230 LibcSupport.Free(outBuffer);
237 internal virtual void Initialize(ImageDecoderHandle handle)
239 if (_colorSpace.HasValue)
241 SetColorspace(Handle, _colorSpace.Value.ToImageColorSpace()).ThrowIfFailed("Failed to set color space");
245 internal abstract byte[] Header { get; }
247 #region IDisposable Support
248 private bool _disposed = false;
251 /// Releases the unmanaged resources used by the ImageDecoder.
253 /// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
254 /// <since_tizen> 4 </since_tizen>
255 protected virtual void Dispose(bool disposing)
268 /// Releases all resources used by the ImageDecoder.
270 /// <since_tizen> 4 </since_tizen>
271 public void Dispose()
279 /// Provides the ability to decode Bitmap (BMP) encoded images.
281 /// <since_tizen> 4 </since_tizen>
282 public class BmpDecoder : ImageDecoder
284 private static readonly byte[] _header = { (byte)'B', (byte)'M' };
287 /// Initializes a new instance of the <see cref="BmpDecoder"/> class.
289 /// <remarks><see cref="ImageDecoder.InputFormat"/> will be the <see cref="ImageFormat.Bmp"/>.</remarks>
290 /// <since_tizen> 4 </since_tizen>
291 public BmpDecoder() : base(ImageFormat.Bmp)
295 internal override byte[] Header => _header;
299 /// Provides the ability to decode the Portable Network Graphics (PNG) encoded images.
301 /// <since_tizen> 4 </since_tizen>
302 public class PngDecoder : ImageDecoder
304 private static readonly byte[] _header = { 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a };
307 /// Initializes a new instance of the <see cref="PngDecoder"/> class.
309 /// <remarks><see cref="ImageDecoder.InputFormat"/> will be the <see cref="ImageFormat.Png"/>.</remarks>
310 /// <since_tizen> 4 </since_tizen>
311 public PngDecoder() : base(ImageFormat.Png)
315 internal override byte[] Header => _header;
319 /// Provides the ability to decode the Joint Photographic Experts Group (JPEG) encoded images.
321 /// <since_tizen> 4 </since_tizen>
322 public class JpegDecoder : ImageDecoder
324 private static readonly byte[] _header = { 0xFF, 0xD8 };
327 /// A read-only field that represents the default value of <see cref="Downscale"/>.
329 /// <since_tizen> 4 </since_tizen>
330 public static readonly JpegDownscale DefaultJpegDownscale = JpegDownscale.None;
332 private JpegDownscale _jpegDownscale = DefaultJpegDownscale;
335 /// Initializes a new instance of the <see cref="JpegDecoder"/> class.
337 /// <remarks><see cref="ImageDecoder.InputFormat"/> will be the <see cref="ImageFormat.Jpeg"/>.</remarks>
338 /// <since_tizen> 4 </since_tizen>
339 public JpegDecoder() : base(ImageFormat.Jpeg)
344 /// Gets or sets the downscale at which the jpeg image should be decoded.
346 /// <exception cref="ArgumentException"><paramref name="value"/> is invalid.</exception>
347 /// <since_tizen> 4 </since_tizen>
348 public JpegDownscale Downscale
352 return _jpegDownscale;
356 ValidationUtil.ValidateEnum(typeof(JpegDownscale), value, nameof(Downscale));
358 _jpegDownscale = value;
362 internal override void Initialize(ImageDecoderHandle handle)
364 base.Initialize(handle);
366 SetJpegDownscale(handle, Downscale).ThrowIfFailed("Failed to set downscale for decoding");
369 internal override byte[] Header => _header;
373 /// Provides the ability to decode the Graphics Interchange Format (GIF) encoded images.
375 /// <since_tizen> 4 </since_tizen>
376 public class GifDecoder : ImageDecoder
378 private static readonly byte[] _header = { (byte)'G', (byte)'I', (byte)'F' };
381 /// Initializes a new instance of the <see cref="GifDecoder"/> class.
383 /// <remarks><see cref="ImageDecoder.InputFormat"/> will be the <see cref="ImageFormat.Gif"/>.</remarks>
384 /// <since_tizen> 4 </since_tizen>
385 public GifDecoder() : base(ImageFormat.Gif)
389 internal override byte[] Header => _header;