2010/12/27 Christian Henning :

Hi Szymon,

On Sun, Dec 26, 2010 at 8:39 PM, Szymon Gatner wrote:

...

Is it possible to find out which of allowed image formats any_image actually has?

For example, if image is loaded with code provided in dynamic_image.cpp:

   typedef boost::mpl::vector my_images_t;

   any_image dynamic_img;    jpeg_read_image("test.jpg",dynamic_img);

how to figure out which colorspace / layout loaded image have?

An any_image is derived from gil::variant which lets you get the index from the type vector you specified. There also is a member called "current_type_is()". But normally you don't need to cast an any_image to a specific type since it should behave like a normal image or view.

Let me know if you have more questions.

Thank you very much. I will dig more into this now. I don't need algorithms now as much as loading and getting format info as I am using GIL for loading png data and creating OpenGL textures from it. Until now I was doing it like so: try { rgba8_image_t img; png_read_image(file, img); setData(view(img)); } catch(...) { } try { rgb8_image_t img; png_read_image(file, img); setData(view(img)); } with setData() overloaded for different view types / formats. Those overloads pass appropriate OpenGL enum representing data layout when texture data is uploaded. Thanks again. You are author of new GIL IO, right? I am really looking forward for it do be included into BOOST but as I just started using GIL I didn't really feel competent enough to participate in the review. Regards Szymon Gatner