generated from vignetteapp/dotnet-template
-
-
Notifications
You must be signed in to change notification settings - Fork 18
/
ImageFrame.cs
287 lines (238 loc) · 10.4 KB
/
ImageFrame.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
// Copyright (c) homuler and The Vignette Authors
// This file is part of MediaPipe.NET.
// MediaPipe.NET is licensed under the MIT License. See LICENSE for details.
using System;
using Mediapipe.Net.Core;
using Mediapipe.Net.Native;
namespace Mediapipe.Net.Framework.Format
{
public unsafe class ImageFrame : MpResourceHandle
{
public static readonly uint DefaultAlignmentBoundary = 16;
public static readonly uint GlDefaultAlignmentBoundary = 4;
public delegate void Deleter(void* ptr);
public ImageFrame() : base()
{
UnsafeNativeMethods.mp_ImageFrame__(out var ptr).Assert();
Ptr = ptr;
}
public ImageFrame(void* imageFramePtr, bool isOwner = true) : base(imageFramePtr, isOwner) { }
public ImageFrame(ImageFormat format, int width, int height) : this(format, width, height, DefaultAlignmentBoundary) { }
public ImageFrame(ImageFormat format, int width, int height, uint alignmentBoundary) : base()
{
UnsafeNativeMethods.mp_ImageFrame__ui_i_i_ui(format, width, height, alignmentBoundary, out var ptr).Assert();
Ptr = ptr;
}
// NOTE: This byte* was a NativeArray<byte> from Unity.
// It will naturally translate to C++'s uint8*.
// The signature on the native side is:
//
// MP_CAPI(MpReturnCode) mp_ImageFrame__ui_i_i_i_Pui8_PF(
// mediapipe::ImageFormat::Format format,
// int width, int height, int width_step, uint8* pixel_data,
// Deleter* deleter, mediapipe::ImageFrame** image_frame_out);
unsafe public ImageFrame(ImageFormat format, int width, int height, int widthStep, byte* pixelData) : base()
{
UnsafeNativeMethods.mp_ImageFrame__ui_i_i_i_Pui8_PF(
format, width, height, widthStep,
pixelData,
releasePixelData,
out var ptr).Assert();
Ptr = ptr;
}
public ImageFrame(ImageFormat format, int width, int height, int widthStep, ReadOnlySpan<byte> pixelData)
: this(format, width, height, widthStep, spanToBytePtr(pixelData)) { }
private static byte* spanToBytePtr(ReadOnlySpan<byte> span)
{
fixed (byte* ptr = span)
{
return ptr;
}
}
protected override void DeleteMpPtr() => UnsafeNativeMethods.mp_ImageFrame__delete(Ptr);
// [AOT.MonoPInvokeCallback(typeof(Deleter))] (?)
private static void releasePixelData(void* ptr)
{
// Do nothing (pixelData is moved)
}
public bool IsEmpty => SafeNativeMethods.mp_ImageFrame__IsEmpty(MpPtr) > 0;
public bool IsContiguous => SafeNativeMethods.mp_ImageFrame__IsContiguous(MpPtr) > 0;
public bool IsAligned(uint alignmentBoundary)
{
SafeNativeMethods.mp_ImageFrame__IsAligned__ui(MpPtr, alignmentBoundary, out var value).Assert();
GC.KeepAlive(this);
return value;
}
public ImageFormat Format => SafeNativeMethods.mp_ImageFrame__Format(MpPtr);
public int Width => SafeNativeMethods.mp_ImageFrame__Width(MpPtr);
public int Height => SafeNativeMethods.mp_ImageFrame__Height(MpPtr);
public int ChannelSize
{
get
{
var code = SafeNativeMethods.mp_ImageFrame__ChannelSize(MpPtr, out var value);
GC.KeepAlive(this);
return valueOrFormatException(code, value);
}
}
public int NumberOfChannels
{
get
{
var code = SafeNativeMethods.mp_ImageFrame__NumberOfChannels(MpPtr, out var value);
GC.KeepAlive(this);
return valueOrFormatException(code, value);
}
}
public int ByteDepth
{
get
{
var code = SafeNativeMethods.mp_ImageFrame__ByteDepth(MpPtr, out var value);
GC.KeepAlive(this);
return valueOrFormatException(code, value);
}
}
public int WidthStep => SafeNativeMethods.mp_ImageFrame__WidthStep(MpPtr);
public byte* MutablePixelData => SafeNativeMethods.mp_ImageFrame__MutablePixelData(MpPtr);
public int PixelDataSize => SafeNativeMethods.mp_ImageFrame__PixelDataSize(MpPtr);
public int PixelDataSizeStoredContiguously
{
get
{
var code = SafeNativeMethods.mp_ImageFrame__PixelDataSizeStoredContiguously(MpPtr, out var value);
GC.KeepAlive(this);
return valueOrFormatException(code, value);
}
}
public void SetToZero()
{
UnsafeNativeMethods.mp_ImageFrame__SetToZero(MpPtr).Assert();
GC.KeepAlive(this);
}
public void SetAlignmentPaddingAreas()
{
UnsafeNativeMethods.mp_ImageFrame__SetAlignmentPaddingAreas(MpPtr).Assert();
GC.KeepAlive(this);
}
public byte[] CopyToByteBuffer(int bufferSize)
=> copyToBuffer<byte>(UnsafeNativeMethods.mp_ImageFrame__CopyToBuffer__Pui8_i, bufferSize);
public ushort[] CopyToUshortBuffer(int bufferSize)
=> copyToBuffer<ushort>(UnsafeNativeMethods.mp_ImageFrame__CopyToBuffer__Pui16_i, bufferSize);
public float[] CopyToFloatBuffer(int bufferSize)
=> copyToBuffer<float>(UnsafeNativeMethods.mp_ImageFrame__CopyToBuffer__Pf_i, bufferSize);
/// <summary>
/// Get the value of a specific channel only.
/// It's useful when only one channel is used (e.g. Hair Segmentation mask).
/// </summary>
/// <param name="channelNumber">
/// Specify from which channel the data will be retrieved.
/// For example, if the format is RGB, 0 means R channel, 1 means G channel, and 2 means B channel.
/// </param>
/// <param name="colors" >
/// The array to which the output data will be written.
/// </param>
public byte[] GetChannel(int channelNumber, bool flipVertically, byte[] colors)
{
var format = Format;
switch (format)
{
case ImageFormat.Srgb:
if (channelNumber < 0 || channelNumber > 3)
throw new ArgumentException($"There are only 3 channels, but No. {channelNumber} is specified");
readChannel(MutablePixelData, channelNumber, 3, Width, Height, WidthStep, flipVertically, colors);
return colors;
case ImageFormat.Srgba:
if (channelNumber < 0 || channelNumber > 4)
throw new ArgumentException($"There are only 4 channels, but No. {channelNumber} is specified");
readChannel(MutablePixelData, channelNumber, 4, Width, Height, WidthStep, flipVertically, colors);
return colors;
default:
throw new NotImplementedException($"Currently only SRGB and SRGBA format are supported: {format}");
}
}
/// <summary>
/// Get the value of a specific channel only.
/// It's useful when only one channel is used (e.g. Hair Segmentation mask).
/// </summary>
/// <param name="channelNumber">
/// Specify from which channel the data will be retrieved.
/// For example, if the format is RGB, 0 means R channel, 1 means G channel, and 2 means B channel.
/// </param>
public byte[] GetChannel(int channelNumber, bool flipVertically)
=> GetChannel(channelNumber, flipVertically, new byte[Width * Height]);
private delegate MpReturnCode CopyToBufferHandler<T>(void* ptr, T* buffer, int bufferSize)
where T : unmanaged;
private T[] copyToBuffer<T>(CopyToBufferHandler<T> handler, int bufferSize)
where T : unmanaged
{
var buffer = new T[bufferSize];
unsafe
{
fixed (T* bufferPtr = buffer)
{
handler(MpPtr, bufferPtr, bufferSize).Assert();
}
}
GC.KeepAlive(this);
return buffer;
}
private T valueOrFormatException<T>(MpReturnCode code, T value)
{
try
{
code.Assert();
return value;
}
catch (MediapipeException)
{
throw new FormatException($"Invalid image format: {Format}");
}
}
/// <remarks>
/// In the source array, pixels are laid out left to right, top to bottom,
/// but in the returned array, left to right, top to bottom.
/// </remarks>
private static void readChannel(byte* ptr, int channelNumber, int channelCount, int width, int height, int widthStep, bool flipVertically, byte[] colors)
{
if (colors.Length != width * height)
throw new ArgumentException("colors length is invalid");
var padding = widthStep - channelCount * width;
unsafe
{
fixed (byte* dest = colors)
{
var pSrc = ptr;
pSrc += channelNumber;
if (flipVertically)
{
var pDest = dest + colors.Length - 1;
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
*pDest-- = *pSrc;
pSrc += channelCount;
}
pSrc += padding;
}
}
else
{
var pDest = dest + width * (height - 1);
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
*pDest++ = *pSrc;
pSrc += channelCount;
}
pSrc += padding;
pDest -= 2 * width;
}
}
}
}
}
}
}