imageloader.h

Linux系统下的《红色警戒》游戏

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 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
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#ifndef GCN_IMAGELOADER_HPP
#define GCN_IMAGELOADER_HPP

#include <string>

#include "guichan/color.h"
#include "guichan/platform.h"

namespace gcn
{
    class Image;
  
    /**
     * ImageLoaders base class. Contains basic image loading functions every
     * image loader should have. Image loaders should inherit from this
     * class and impements it's functions.
     */
    class GCN_CORE_DECLSPEC ImageLoader
    {
    public:
    
        /**
         * Destructor.
         */
        virtual ~ImageLoader() { }

        /**
         * Prepares an image for reading. After you have called this function
         * you can retrieve information about it and edit it.
         *
         * @param filename the image file to prepare.
         * @throws Exception when called without having finalized or disposed to
         *                   last image or when unable to load the image.
         */
        virtual void prepare(const std::string& filename) = 0;

        /**
         * This function frees an image.
         *
         * NOTE: There is generally no reason to call this function as
         *       it is called upon by the Image object when destroying an Image.
         *
         * @param image the image to be freed and removed.
         * @throws Exception when image points to NULL.
         */
        virtual void free(Image* image) = 0;

        /**
         * Rreturns a pointer of raw data of an image. The raw data is in 32
         * bit RGBA format. The funcion will not free a prepared image, so
         * finalize or discard should be used afterwards.
         *
         * @return a pointer to the raw image data.
         */
        virtual void* getRawData() = 0;
    
        /**
         * Finalizes an image meaning it will return the image data. If the
         * image contains pixels with "magic pink" (0xff00ff) they will be
         * treated as transparent pixels.
         *
         * @return a pointer to the image data.
         * @throws Exception when no image has been prepared.
         */
        virtual void* finalize() = 0;

        /**
         * Discards a prepared image.
         *
         * @throws Exception when no image has been prepared.
         */
        virtual void discard() = 0;
    
        /**
         * Gets the height if the image.
         *
         * @return the height of the image.
         * @throws Exception if no image have been prepared.
         */
        virtual int getHeight() const = 0;

        /**
         * Gets the width of an image.
         *
         * @return the width of the image.
         * @throws Exception if no image have been prepared.
         */
        virtual int getWidth() const = 0;

        /**
         * Gets the color of a pixel at coordinate x and y.
         *
         * @param x the x coordinate.
         * @param y the y coordinate.
         * @return the color of the pixel.
         */
        virtual Color getPixel(int x, int y) = 0;

        /**
         * Puts a pixel with a certain color at coordinate x and y.
         *
         * @param x the x coordinate.
         * @param y the y coordinate.
         * @param color the color of the pixel to put.
         */
        virtual void putPixel(int x, int y, const Color& color) = 0;    
    };  
}

#endif // end GCN_IMAGELOADER_HPP