src/fltk-images-rgb-png.adb


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with

    Interfaces.C,
    System;

use type

    System.Address;


package body FLTK.Images.RGB.PNG is


    function new_fl_png_image
           (F : in Interfaces.C.char_array)
        return System.Address;
    pragma Import (C, new_fl_png_image, "new_fl_png_image");

    procedure free_fl_png_image
           (P : in System.Address);
    pragma Import (C, free_fl_png_image, "free_fl_png_image");


    overriding procedure Finalize
           (This : in out PNG_Image) is
    begin
        if  This.Void_Ptr /= System.Null_Address and then
            This in PNG_Image'Class
        then
            free_fl_png_image (This.Void_Ptr);
            This.Void_Ptr := System.Null_Address;
        end if;
        Finalize (RGB_Image (This));
    end Finalize;


    function Create
           (Filename : in String)
        return PNG_Image is
    begin
        return This : PNG_Image do
            This.Void_Ptr := new_fl_png_image
                   (Interfaces.C.To_C (Filename));
            case fl_image_fail (This.Void_Ptr) is
                when 1 =>
                    raise No_Image_Error;
                when 2 =>
                    raise File_Access_Error;
                when 3 =>
                    raise Format_Error;
                when others =>
                    null;
            end case;
        end return;
    end Create;


end FLTK.Images.RGB.PNG;