feat: Xplat support for image loading and saving from memory

sources/engine/Stride/Graphics/StandardImageHelper.Desktop.cs

@@ -0,0 +1,115 @@
+// Copyright (c) .NET Foundation and Contributors (https://dotnetfoundation.org/ & https://stride3d.net) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
+// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
+#if STRIDE_PLATFORM_DESKTOP
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using FreeImageAPI;
+using Stride.Core;
+using RotateFlipType = FreeImageAPI.RotateFlipType;
+
+namespace Stride.Graphics
+{
+    /// <summary>
+    /// This class is responsible to provide image loader for png, gif, bmp.
+    /// </summary>
+    partial class StandardImageHelper
+    {
+        static StandardImageHelper()
+        {
+            NativeLibraryHelper.PreloadLibrary("freeimage", typeof(StandardImageHelper));
+        }
+
+        public static unsafe Image LoadFromMemory(IntPtr pSource, int size, bool makeACopy, GCHandle? handle)
+        {
+            using var memoryStream = new UnmanagedMemoryStream((byte*)pSource, size, capacity: size, access: FileAccess.Read);
+            using var bitmap = FreeImageBitmap.FromStream(memoryStream);
+
+            bitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);
+            bitmap.ConvertColorDepth(FREE_IMAGE_COLOR_DEPTH.FICD_32_BPP);
+
+            var image = Image.New2D(bitmap.Width, bitmap.Height, 1, PixelFormat.B8G8R8A8_UNorm, 1, bitmap.Line);
+
+            try
+            {
+                // TODO: Test if still necessary
+                // Directly load image as RGBA instead of BGRA, because OpenGL ES devices don't support it out of the box (extension).
+                Utilities.CopyWithAlignmentFallback((void*)image.PixelBuffer[0].DataPointer, (void*)bitmap.Bits, (uint)image.PixelBuffer[0].BufferStride);
+            }
+            finally
+            {
+                if (handle != null)
+                    handle.Value.Free();
+                else if (!makeACopy)
+                    Utilities.FreeMemory(pSource);
+            }
+
+            return image;
+        }
+
+        public static void SaveGifFromMemory(PixelBuffer[] pixelBuffers, int count, ImageDescription description, Stream imageStream)
+        {
+            SaveFromMemory(pixelBuffers, description, imageStream, FREE_IMAGE_FORMAT.FIF_GIF);
+        }
+
+        public static void SaveTiffFromMemory(PixelBuffer[] pixelBuffers, int count, ImageDescription description, Stream imageStream)
+        {
+            SaveFromMemory(pixelBuffers, description, imageStream, FREE_IMAGE_FORMAT.FIF_TIFF);
+        }
+
+        public static void SaveBmpFromMemory(PixelBuffer[] pixelBuffers, int count, ImageDescription description, Stream imageStream)
+        {
+            SaveFromMemory(pixelBuffers, description, imageStream, FREE_IMAGE_FORMAT.FIF_BMP);
+        }
+
+        public static void SaveJpgFromMemory(PixelBuffer[] pixelBuffers, int count, ImageDescription description, Stream imageStream)
+        {
+            SaveFromMemory(pixelBuffers, description, imageStream, FREE_IMAGE_FORMAT.FIF_BMP);
+        }
+
+        public static void SavePngFromMemory(PixelBuffer[] pixelBuffers, int count, ImageDescription description, Stream imageStream)
+        {
+            SaveFromMemory(pixelBuffers, description, imageStream, FREE_IMAGE_FORMAT.FIF_PNG);
+        }
+
+        public static void SaveWmpFromMemory(PixelBuffer[] pixelBuffers, int count, ImageDescription description, Stream imageStream)
+        {
+            throw new NotImplementedException();
+        }
+
+        private static unsafe void SaveFromMemory(PixelBuffer[] pixelBuffers, ImageDescription description, Stream imageStream, FREE_IMAGE_FORMAT imageFormat)
+        {
+            using var bitmap = new FreeImageBitmap(description.Width, description.Height);
+            bitmap.ConvertColorDepth(FREE_IMAGE_COLOR_DEPTH.FICD_32_BPP);
+
+            // Copy memory
+            var format = description.Format;
+            if (format is PixelFormat.R8G8B8A8_UNorm or PixelFormat.R8G8B8A8_UNorm_SRgb)
+            {
+                CopyMemoryBGRA(bitmap.Bits, pixelBuffers[0].DataPointer, pixelBuffers[0].BufferStride);
+            }
+            else if (format is PixelFormat.B8G8R8A8_UNorm or PixelFormat.B8G8R8A8_UNorm_SRgb)
+            {
+                Utilities.CopyWithAlignmentFallback((void*)bitmap.Bits, (void*)pixelBuffers[0].DataPointer, (uint)pixelBuffers[0].BufferStride);
+            }
+            else if (format is PixelFormat.R8_UNorm or PixelFormat.A8_UNorm)
+            {
+                // TODO Ideally we will want to support grayscale images, but the SpriteBatch can only render RGBA for now
+                //  so convert the grayscale image as an RGBA and save it
+                CopyMemoryRRR1(bitmap.Bits, pixelBuffers[0].DataPointer, pixelBuffers[0].BufferStride);
+            }
+            else
+            {
+                throw new ArgumentException(
+                    message:
+                    $"The pixel format {format} is not supported. Supported formats are {PixelFormat.B8G8R8A8_UNorm}, {PixelFormat.B8G8R8A8_UNorm_SRgb}, {PixelFormat.R8G8B8A8_UNorm}, {PixelFormat.R8G8B8A8_UNorm_SRgb}, {PixelFormat.R8_UNorm}, {PixelFormat.A8_UNorm}",
+                    paramName: nameof(description));
+            }
+
+            // Save
+            bitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);
+            bitmap.Save(imageStream, imageFormat);
+        }
+    }
+}
+#endif

sources/engine/Stride/Stride.csproj

@@ -32,6 +32,7 @@
     <!-- SharpDX is needed for WIC -->
     <PackageReference Include="SharpDX.Direct2D1" Condition="'$(TargetFramework)' == '$(StrideFrameworkUWP)'" />
     <PackageReference Include="System.Drawing.Common" Condition="'$(TargetFramework)' == '$(StrideFramework)'" />
+    <ProjectReference Include="..\..\tools\Stride.FreeImage\Stride.FreeImage.csproj" />
   </ItemGroup>
 
   <ItemGroup>