## Summary The fcl-image readers can determine the size of an image from the file header or meta data without having to load the entire image, `function ImageSize()` . For this purpose the base class, `TFPCustomImageReader`, provides a virtual class function `InternalSize()`, which every reader class must implement in order to support this feature. The reader for BMP images, `TFPReaderBMP`, however, does not implement this method, and therefore, the image width and height are always reported by the `ImageSize()` function to be -1. The attached patch provides the missing `InternalSize()` class method. [fpreadbmp_internalsize.diff](/uploads/7099bff8417ae5ce162b861d8f8b6062/fpreadbmp_internalsize.diff) ## System Information - **Operating system:** Windows 11 - **Processor architecture:** x86-64 - **Compiler version:** trunk (22de07446dc3b14f4dab989709912a20e7cc7110) - **Device:** Computer ## Steps to reproduce The attached project uses the `ImageSize()` function to determine the size of the _fp32.bmp_ image. The current code returns width and height to be -1. After application of above patch, the output is correct (Width = 32, Height = 32). [bmp_imagesize.zip](/uploads/b84839aab12bf0046d46301d44dba368/bmp_imagesize.zip)