{"record":{"id":"7c9143aae68d4905","repo":"MonoGame/MonoGame","slug":"type-t-is-of-an-invalid-size-for-the-format-of-thi-7c9143","errorCode":null,"errorMessage":"Type T is of an invalid size for the format of this texture.","messagePattern":"Type T is of an invalid size for the format of this texture\\.","errorType":"validation","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"MonoGame.Framework/Graphics/Texture2D.cs","lineNumber":794,"sourceCode":"        private void ValidateParams<T>(int level, int arraySlice, Rectangle? rect, T[] data,\n            int startIndex, int elementCount, out Rectangle checkedRect) where T : struct\n        {\n            var textureBounds = new Rectangle(0, 0, Math.Max(width >> level, 1), Math.Max(height >> level, 1));\n            checkedRect = rect ?? textureBounds;\n            if (level < 0 || level >= LevelCount)\n                throw new ArgumentException(\"level must be smaller than the number of levels in this texture.\", \"level\");\n            if (arraySlice > 0 && !GraphicsDevice.GraphicsCapabilities.SupportsTextureArrays)\n                throw new ArgumentException(\"Texture arrays are not supported on this graphics device\", \"arraySlice\");\n            if (arraySlice < 0 || arraySlice >= ArraySize)\n                throw new ArgumentException(\"arraySlice must be smaller than the ArraySize of this texture and larger than 0.\", \"arraySlice\");\n            if (!textureBounds.Contains(checkedRect) || checkedRect.Width <= 0 || checkedRect.Height <= 0)\n                throw new ArgumentException(\"Rectangle must be inside the texture bounds\", \"rect\");\n            if (data == null)\n                throw new ArgumentNullException(\"data\");\n            var tSize = ReflectionHelpers.FastSizeOf<T>();\n            var fSize = Format.GetSize();\n            if (tSize > fSize || fSize % tSize != 0)\n                throw new ArgumentException(\"Type T is of an invalid size for the format of this texture.\", \"T\");\n            if (startIndex < 0 || startIndex >= data.Length)\n                throw new ArgumentException(\"startIndex must be at least zero and smaller than data.Length.\", \"startIndex\");\n            if (data.Length < startIndex + elementCount)\n                throw new ArgumentException(\"The data array is too small.\");\n\n            int dataByteSize;\n            if (Format.IsCompressedFormat())\n            {\n                int blockWidth, blockHeight;\n                Format.GetBlockSize(out blockWidth, out blockHeight);\n                // round x and y down to next multiple of block size; width and height up to next multiple of block size\n                // we need to use this rather than the old code where because ASTC Compressed Textures are NOT Powers of 2.\n                var roundedWidth = (checkedRect.Width + blockWidth - 1) / blockWidth * blockWidth;\n                var roundedHeight = (checkedRect.Height + blockHeight - 1) / blockHeight * blockHeight;\n                checkedRect = new Rectangle(checkedRect.X / blockWidth * blockWidth, checkedRect.Y / blockHeight * blockHeight,\n#if OPENGL\n                    // OpenGL only: The last two mip levels require the width and height to be\n                    // passed as 2x2 and 1x1, but there needs to be enough data passed to occupy","sourceCodeStart":776,"sourceCodeEnd":812,"githubUrl":"https://github.com/MonoGame/MonoGame/blob/1d71bbd0ff4071a03caa583aa3bc56b85924a819/MonoGame.Framework/Graphics/Texture2D.cs#L776-L812","documentation":"Thrown by Texture2D.ValidateParams as an ArgumentException when the element type T is the wrong size for the texture's SurfaceFormat. The rule is tSize = sizeof(T) and fSize = Format.GetSize(); it throws when tSize > fSize or fSize % tSize != 0. This lets you read/write a block-compressed or larger-pixel format with a smaller type, but forbids a type larger than one pixel or one that doesn't evenly divide the pixel size.","triggerScenarios":"Using `SetData<Color>` on a HalfVector2 (8-bit-per-pixel-ish) or compressed (DXT/ASTC) texture where sizeof(Color)==4 is not a divisor/fit; using a struct whose marshalled size doesn't match the format; reading a DXT5 texture with a byte[] where the block math differs.","commonSituations":"Assuming all textures are 32-bit Color and calling SetData<Color>/GetData<Color> on a Rgba64, HalfSingle, or compressed surface; authoring a custom struct with padding that changes its size; format mismatch after changing a texture's SurfaceFormat.","solutions":["Match T to the SurfaceFormat: use the format's native struct (e.g. HalfVector4 for Rgba64, byte/int for block formats) or use a type whose size divides the pixel size.","Check tSize vs Format.GetSize() before the call: require tSize <= fSize && fSize % tSize == 0.","Recreate the texture with SurfaceFormat.Color if you intend to use Color (32-bit) elements."],"exampleFix":"// before\n_tex = new Texture2D(GraphicsDevice, w, h, false, SurfaceFormat.Rgba64);\nvar data = new Color[w * h];\n_tex.SetData(data); // sizeof(Color)=4 vs Rgba64=8 -> throws 459\n\n// after\nvar data = new Rgba64[w * h]; // sizeof == 8, matches SurfaceFormat.Rgba64\n_tex.SetData(data);","handlingStrategy":"validation","validationCode":"static void AssertTypeFits<T>(SurfaceFormat format) where T : struct\n{\n    int tSize = System.Runtime.InteropServices.Marshal.SizeOf<T>();\n    int fSize = format.GetSize();\n    if (tSize > fSize || fSize % tSize != 0)\n        throw new ArgumentException($\"sizeof({typeof(T)})={tSize} is invalid for {format} (size {fSize})\");\n}","typeGuard":"static bool TypeMatches<T>(SurfaceFormat format) where T : struct\n{\n    int tSize = System.Runtime.InteropServices.Marshal.SizeOf<T>();\n    int fSize = format.GetSize();\n    return tSize <= fSize && fSize % tSize == 0;\n}","tryCatchPattern":null,"preventionTips":["Match the element type T to the texture's SurfaceFormat (e.g. Rgba64 -> Rgba64 struct, Color -> Color).","Check sizeof(T) vs Format.GetSize() before GetData/SetData.","Use byte/int for block-compressed formats only when the block math aligns."],"tags":["monogame","graphics","texture2d","surfaceformat","marshalling","validation","argument-exception","getdata-setdata"],"backgroundTag":null,"analyzedSha":"1d71bbd0ff4071a03caa583aa3bc56b85924a819","analyzedAt":"2026-08-13T17:10:33.625Z","schemaVersion":2},"datasetVersion":"2026-08-13T19:17:28.613Z"}