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
|
using System;
using System.Collections.Generic;
using System.IO;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Model.IO;
using SkiaSharp;
namespace Emby.Drawing
{
public class StripCollageBuilder
{
private readonly IApplicationPaths _appPaths;
private readonly IFileSystem _fileSystem;
public StripCollageBuilder(IApplicationPaths appPaths, IFileSystem fileSystem)
{
_appPaths = appPaths;
_fileSystem = fileSystem;
}
public static SKEncodedImageFormat GetEncodedFormat(string outputPath)
{
if (outputPath == null)
{
throw new ArgumentNullException(nameof(outputPath));
}
var ext = Path.GetExtension(outputPath).ToLower();
if (ext == ".jpg" || ext == ".jpeg")
return SKEncodedImageFormat.Jpeg;
if (ext == ".webp")
return SKEncodedImageFormat.Webp;
if (ext == ".gif")
return SKEncodedImageFormat.Gif;
if (ext == ".bmp")
return SKEncodedImageFormat.Bmp;
// default to png
return SKEncodedImageFormat.Png;
}
public void BuildPosterCollage(string[] paths, string outputPath, int width, int height)
{
// @todo
}
public void BuildSquareCollage(string[] paths, string outputPath, int width, int height)
{
using (var bitmap = BuildSquareCollageBitmap(paths, width, height))
{
using (var outputStream = new SKFileWStream(outputPath))
{
using (var pixmap = new SKPixmap(new SKImageInfo(width, height), bitmap.GetPixels()))
{
pixmap.Encode(outputStream, GetEncodedFormat(outputPath), 90);
}
}
}
}
public void BuildThumbCollage(string[] paths, string outputPath, int width, int height)
{
using (var bitmap = BuildThumbCollageBitmap(paths, width, height))
{
using (var outputStream = new SKFileWStream(outputPath))
{
using (var pixmap = new SKPixmap(new SKImageInfo(width, height), bitmap.GetPixels()))
{
pixmap.Encode(outputStream, GetEncodedFormat(outputPath), 90);
}
}
}
}
private SKBitmap BuildThumbCollageBitmap(string[] paths, int width, int height)
{
var bitmap = new SKBitmap(width, height);
using (var canvas = new SKCanvas(bitmap))
{
canvas.Clear(SKColors.Black);
// determine sizes for each image that will composited into the final image
var iSlice = Convert.ToInt32(width * 0.23475);
int iTrans = Convert.ToInt32(height * .25);
int iHeight = Convert.ToInt32(height * .70);
var horizontalImagePadding = Convert.ToInt32(width * 0.0125);
var verticalSpacing = Convert.ToInt32(height * 0.01111111111111111111111111111111);
int imageIndex = 0;
for (int i = 0; i < 4; i++)
{
using (var currentBitmap = GetNextValidImage(paths, imageIndex, out int newIndex))
{
imageIndex = newIndex;
if (currentBitmap == null)
{
continue;
}
// resize to the same aspect as the original
int iWidth = (int)Math.Abs(iHeight * currentBitmap.Width / currentBitmap.Height);
using (var resizeBitmap = new SKBitmap(iWidth, iHeight, currentBitmap.ColorType, currentBitmap.AlphaType))
{
currentBitmap.ScalePixels(resizeBitmap, SKFilterQuality.High);
// crop image
int ix = (int)Math.Abs((iWidth - iSlice) / 2);
using (var image = SKImage.FromBitmap(resizeBitmap))
using (var subset = image.Subset(SKRectI.Create(ix, 0, iSlice, iHeight)))
{
// draw image onto canvas
canvas.DrawImage(subset ?? image, (horizontalImagePadding * (i + 1)) + (iSlice * i), verticalSpacing);
if (subset == null)
{
continue;
}
// create reflection of image below the drawn image
using (var croppedBitmap = SKBitmap.FromImage(subset))
using (var reflectionBitmap = new SKBitmap(croppedBitmap.Width, croppedBitmap.Height / 2, croppedBitmap.ColorType, croppedBitmap.AlphaType))
{
// resize to half height
currentBitmap.ScalePixels(reflectionBitmap, SKFilterQuality.High);
using (var flippedBitmap = new SKBitmap(reflectionBitmap.Width, reflectionBitmap.Height, reflectionBitmap.ColorType, reflectionBitmap.AlphaType))
using (var flippedCanvas = new SKCanvas(flippedBitmap))
{
// flip image vertically
var matrix = SKMatrix.MakeScale(1, -1);
matrix.SetScaleTranslate(1, -1, 0, flippedBitmap.Height);
flippedCanvas.SetMatrix(matrix);
flippedCanvas.DrawBitmap(reflectionBitmap, 0, 0);
flippedCanvas.ResetMatrix();
// create gradient to make image appear as a reflection
var remainingHeight = height - (iHeight + (2 * verticalSpacing));
flippedCanvas.ClipRect(SKRect.Create(reflectionBitmap.Width, remainingHeight));
using (var gradient = new SKPaint())
{
gradient.IsAntialias = true;
gradient.BlendMode = SKBlendMode.SrcOver;
gradient.Shader = SKShader.CreateLinearGradient(new SKPoint(0, 0), new SKPoint(0, remainingHeight), new[] { new SKColor(0, 0, 0, 128), new SKColor(0, 0, 0, 208), new SKColor(0, 0, 0, 240), new SKColor(0, 0, 0, 255) }, null, SKShaderTileMode.Clamp);
flippedCanvas.DrawPaint(gradient);
}
// finally draw reflection onto canvas
canvas.DrawBitmap(flippedBitmap, (horizontalImagePadding * (i + 1)) + (iSlice * i), iHeight + (2 * verticalSpacing));
}
}
}
}
}
}
}
return bitmap;
}
private SKBitmap GetNextValidImage(string[] paths, int currentIndex, out int newIndex)
{
var imagesTested = new Dictionary<int, int>();
SKBitmap bitmap = null;
while (imagesTested.Count < paths.Length)
{
if (currentIndex >= paths.Length)
{
currentIndex = 0;
}
bitmap = SkiaEncoder.Decode(paths[currentIndex], false, _fileSystem, null, out var origin);
imagesTested[currentIndex] = 0;
currentIndex++;
if (bitmap != null)
{
break;
}
}
newIndex = currentIndex;
return bitmap;
}
private SKBitmap BuildSquareCollageBitmap(string[] paths, int width, int height)
{
var bitmap = new SKBitmap(width, height);
var imageIndex = 0;
var cellWidth = width / 2;
var cellHeight = height / 2;
using (var canvas = new SKCanvas(bitmap))
{
for (var x = 0; x < 2; x++)
{
for (var y = 0; y < 2; y++)
{
using (var currentBitmap = GetNextValidImage(paths, imageIndex, out int newIndex))
{
imageIndex = newIndex;
if (currentBitmap == null)
{
continue;
}
using (var resizedBitmap = new SKBitmap(cellWidth, cellHeight, currentBitmap.ColorType, currentBitmap.AlphaType))
{
// scale image
currentBitmap.ScalePixels(resizedBitmap, SKFilterQuality.High);
// draw this image into the strip at the next position
var xPos = x * cellWidth;
var yPos = y * cellHeight;
canvas.DrawBitmap(resizedBitmap, xPos, yPos);
}
}
}
}
}
return bitmap;
}
}
}
|
