GetImageRawSize

GetImageRawSize is a function that retrieves the raw dimensions of an image file without considering any scaling or transformations. This means it returns the original pixel width and height as they are stored within the image data itself. This is distinct from functions that might return the display size of an image after it has been resized or scaled by software or hardware.

The primary purpose of GetImageRawSize is to obtain the intrinsic size of an image. This information is often crucial for tasks such as image validation, memory allocation for image processing, or determining the necessary buffer size before loading the full image data. For example, when an application needs to load an image into memory for editing, knowing the raw size allows it to allocate the correct amount of memory upfront, preventing potential buffer overflows or underflows.

The function typically takes the path to the image file as an input parameter and returns a structure or a pair of integers representing the width and height. It is important to note that GetImageRawSize generally does not perform image decoding in the sense of interpreting the image's color space or compression format. Instead, it often reads metadata or a header section of the image file where these dimensions are stored. Different image file formats (like JPEG, PNG, BMP) have their own specific header structures, and the GetImageRawSize implementation must be able to parse these formats correctly to extract the raw dimensions.