fixup! feat: Xplat support for image loading and saving from memory

Author: Jklawreszuk

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

@@ -33,7 +33,7 @@ public static unsafe Image LoadFromMemory(IntPtr pSource, int size, bool makeACo
                 // Directly load image as RGBA instead of BGRA, because OpenGL ES devices don't support it out of the box (extension).
                 //image.Description.Format = PixelFormat.R8G8B8A8_UNorm;
                 //CopyMemoryBGRA(image.PixelBuffer[0].DataPointer, bitmapData.Scan0, image.PixelBuffer[0].BufferStride);
-                Unsafe.CopyBlockUnaligned((void*)image.PixelBuffer[0].DataPointer, (void*)bitmapData.Scan0, (uint)bitmap.Width * 4);
+                Unsafe.CopyBlockUnaligned((void*)image.PixelBuffer[0].DataPointer, (void*)bitmapData.Scan0, (uint)image.PixelBuffer[0].BufferStride);
             }
             finally
             {
@@ -94,17 +94,17 @@ private static unsafe void SaveFromMemory(PixelBuffer[] pixelBuffers, ImageDescr
                 var format = description.Format;
                 if (format is PixelFormat.R8G8B8A8_UNorm or PixelFormat.R8G8B8A8_UNorm_SRgb)
                 {
-                    CopyMemoryBGRA(bitmapData.Scan0, pixelBuffers[0].DataPointer, bitmap.Width * 4);
+                    CopyMemoryBGRA(bitmapData.Scan0, pixelBuffers[0].DataPointer, pixelBuffers[0].BufferStride);
                 }
                 else if (format is PixelFormat.B8G8R8A8_UNorm or PixelFormat.B8G8R8A8_UNorm_SRgb)
                 {
-                    Unsafe.CopyBlockUnaligned((void*)bitmapData.Scan0, (void*)pixelBuffers[0].DataPointer, (uint)bitmap.Width * 4);
+                    Unsafe.CopyBlockUnaligned((void*)bitmapData.Scan0, (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(bitmapData.Scan0, pixelBuffers[0].DataPointer, bitmap.Width * 4);
+                    CopyMemoryRRR1(bitmapData.Scan0, pixelBuffers[0].DataPointer, pixelBuffers[0].BufferStride);
                 }
                 else
                 {