caps: Implement SaveScreenShot calls and cleanup (#2140)

* caps: Implement SaveScreenShot calls and cleanup

This PR implement:
- caps:u IAlbumApplicationService (32) SetShimLibraryVersion
- caps:c IAlbumControlService (33) SetShimLibraryVersion
- caps:su IScreenShotApplicationService (32) SetShimLibraryVersion
- caps:su IScreenShotApplicationService (203/205/210) SaveScreenShotEx0/SaveScreenShotEx1/SaveScreenShotEx2

ImageSharp is used to save the raw screenshot data as a JPG file following what the service does.
All screenshots are save in: `%AppData%\Ryujinx\sdcard\Nintendo\Album` folder. (as example a screenshot file path will be `%AppData%\Ryujinx\sdcard\Nintendo\Album\2021\03\26\2021032601020300-0123456789ABCDEF0123456789ABCDEF.jpg`

This is needed by Animal Crossing: New Horizon where screenshots looks like this:

And this is needed in Monster Hunter Rise but screenshots are currently empty due to another issue.

* remove useless comment

* Addresses gdkchan feedback

* Addresses gdkchan feedback 2

* remove useless comment 2

* Fix nits

1 files changed, 143 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Caps/CaptureManager.cs b/Ryujinx.HLE/HOS/Services/Caps/CaptureManager.cs
new file mode 100644
index 00000000..37cc9bda
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Services/Caps/CaptureManager.cs
@@ -0,0 +1,143 @@
+using Ryujinx.Common.Memory;
+using Ryujinx.HLE.HOS.Services.Caps.Types;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Formats.Jpeg;
+using SixLabors.ImageSharp.PixelFormats;
+using System;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Security.Cryptography;
+
+namespace Ryujinx.HLE.HOS.Services.Caps
+{
+    class CaptureManager
+    {
+        private string _sdCardPath;
+
+        private uint _shimLibraryVersion;
+
+        public CaptureManager(Switch device)
+        {
+            _sdCardPath = device.FileSystem.GetSdCardPath();
+
+            SixLabors.ImageSharp.Configuration.Default.ImageFormatsManager.SetEncoder(JpegFormat.Instance, new JpegEncoder()
+            {
+                Quality = 100
+            });
+        }
+
+        public ResultCode SetShimLibraryVersion(ServiceCtx context)
+        {
+            ulong shimLibraryVersion   = context.RequestData.ReadUInt64();
+            ulong appletResourceUserId = context.RequestData.ReadUInt64();
+
+            // TODO: Service checks if the pid is present in an internal list and returns ResultCode.BlacklistedPid if it is.
+            //       The list contents needs to be determined.
+
+            ResultCode resultCode = ResultCode.OutOfRange;
+
+            if (shimLibraryVersion != 0)
+            {
+                if (_shimLibraryVersion == shimLibraryVersion)
+                {
+                    resultCode = ResultCode.Success;
+                }
+                else if (_shimLibraryVersion != 0)
+                {
+                    resultCode = ResultCode.ShimLibraryVersionAlreadySet;
+                }
+                else if (shimLibraryVersion == 1)
+                {
+                    resultCode = ResultCode.Success;
+
+                    _shimLibraryVersion = 1;
+                }
+            }
+
+            return resultCode;
+        }
+
+        public ResultCode SaveScreenShot(byte[] screenshotData, ulong appletResourceUserId, ulong titleId, out ApplicationAlbumEntry applicationAlbumEntry)
+        {
+            applicationAlbumEntry = default;
+
+            if (screenshotData.Length == 0)
+            {
+                return ResultCode.NullInputBuffer;
+            }
+
+            /*
+            // NOTE: On our current implementation, appletResourceUserId starts at 0, disable it for now.
+            if (appletResourceUserId == 0)
+            {
+                return ResultCode.InvalidArgument;
+            }
+            */
+
+            /*
+            // Doesn't occur in our case.
+            if (applicationAlbumEntry == null)
+            {
+                return ResultCode.NullOutputBuffer;
+            }
+            */
+
+            if (screenshotData.Length >= 0x384000)
+            {
+                DateTime currentDateTime = DateTime.Now;
+
+                applicationAlbumEntry = new ApplicationAlbumEntry()
+                {
+                    Size              = (ulong)Unsafe.SizeOf<ApplicationAlbumEntry>(),
+                    TitleId           = titleId,
+                    AlbumFileDateTime = new AlbumFileDateTime()
+                    {
+                        Year     = (ushort)currentDateTime.Year,
+                        Month    = (byte)currentDateTime.Month,
+                        Day      = (byte)currentDateTime.Day,
+                        Hour     = (byte)currentDateTime.Hour,
+                        Minute   = (byte)currentDateTime.Minute,
+                        Second   = (byte)currentDateTime.Second,
+                        UniqueId = 0
+                    },
+                    AlbumStorage      = AlbumStorage.Sd,
+                    ContentType       = ContentType.Screenshot,
+                    Padding           = new Array5<byte>(),
+                    Unknown0x1f       = 1
+                };
+
+                using (SHA256 sha256Hash = SHA256.Create())
+                {
+                    // NOTE: The hex hash is a HMAC-SHA256 (first 32 bytes) using a hardcoded secret key over the titleId, we can simulate it by hashing the titleId instead.
+                    string hash       = BitConverter.ToString(sha256Hash.ComputeHash(BitConverter.GetBytes(titleId))).Replace("-", "").Remove(0x20);
+                    string folderPath = Path.Combine(_sdCardPath, "Nintendo", "Album", currentDateTime.Year.ToString("00"), currentDateTime.Month.ToString("00"), currentDateTime.Day.ToString("00"));
+                    string filePath   = GenerateFilePath(folderPath, applicationAlbumEntry, currentDateTime, hash);
+
+                    // TODO: Handle that using the FS service implementation and return the right error code instead of throwing exceptions.
+                    Directory.CreateDirectory(folderPath);
+
+                    while (File.Exists(filePath))
+                    {
+                        applicationAlbumEntry.AlbumFileDateTime.UniqueId++;
+
+                        filePath = GenerateFilePath(folderPath, applicationAlbumEntry, currentDateTime, hash);
+                    }
+                
+                    // NOTE: The saved JPEG file doesn't have the limitation in the extra EXIF data.
+                    Image.LoadPixelData<Rgba32>(screenshotData, 1280, 720).SaveAsJpegAsync(filePath);
+                }
+
+                return ResultCode.Success;
+            }
+
+            return ResultCode.NullInputBuffer;
+        }
+
+        private string GenerateFilePath(string folderPath, ApplicationAlbumEntry applicationAlbumEntry, DateTime currentDateTime, string hash)
+        {
+            string fileName = $"{currentDateTime:yyyyMMddHHmmss}{applicationAlbumEntry.AlbumFileDateTime.UniqueId:00}-{hash}.jpg";
+
+            return Path.Combine(folderPath, fileName);
+        }
+    }
+}
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