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/*
* The Mana World
* Copyright (C) 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef IMAGE_H
#define IMAGE_H
#include "main.h"
#include "resources/resource.h"
#include <SDL.h>
#ifdef USE_OPENGL
/* The definition of OpenGL extensions by SDL is giving problems with recent
* gl.h headers, since they also include these definitions. As we're not using
* extensions anyway it's safe to just disable the SDL version.
*/
#define NO_SDL_GLEXT
#include <SDL_opengl.h>
#endif
class Dye;
class Position;
/**
* Defines a class for loading and storing images.
*/
class Image : public Resource
{
friend class Graphics;
#ifdef USE_OPENGL
friend class OpenGLGraphics;
#endif
public:
/**
* Destructor.
*/
virtual ~Image();
/**
* Loads an image from a buffer in memory.
*
* @param buffer The memory buffer containing the image data.
* @param bufferSize The size of the memory buffer in bytes.
*
* @return <code>NULL</code> if an error occurred, a valid pointer
* otherwise.
*/
static Resource *load(void *buffer, unsigned bufferSize);
/**
* Loads an image from a buffer in memory and recolors it.
*
* @param buffer The memory buffer containing the image data.
* @param bufferSize The size of the memory buffer in bytes.
* @param dye The dye used to recolor the image.
*
* @return <code>NULL</code> if an error occurred, a valid pointer
* otherwise.
*/
static Resource *load(void *buffer, unsigned bufferSize,
Dye const &dye);
/**
* Loads an image from an SDL surface.
*/
static Image *load(SDL_Surface *);
/**
* Gets an scaled instance of an image.
*
* @param width The desired width of the scaled image.
* @param height The desired height of the scaled image.
*
* @return A new Image* object.
*/
Image* SDLgetScaledImage(int width, int height);
/**
* Frees the resources created by SDL.
*/
virtual void unload();
/**
* Returns the width of the image.
*/
virtual int getWidth() const
{ return mBounds.w; }
/**
* Returns the height of the image.
*/
virtual int getHeight() const
{ return mBounds.h; }
/**
* Tells if the image was loade using OpenGL or SDL
* @return true if OpenGL, false if SDL.
*/
bool isAnOpenGLOne() const;
/**
* Creates a new image with the desired clipping rectangle.
*
* @return <code>NULL</code> if creation failed and a valid
* object otherwise.
*/
virtual Image *getSubImage(int x, int y, int width, int height);
/**
* Sets the alpha value of this image.
*/
virtual void setAlpha(float alpha);
/**
* Returns the alpha value of this image.
*/
float getAlpha() const;
#ifdef USE_OPENGL
/**
* Sets the target image format. Use <code>false</code> for SDL and
* <code>true</code> for OpenGL.
*/
static void setLoadAsOpenGL(bool useOpenGL);
int getTextureWidth() const { return mTexWidth; }
int getTextureHeight() const { return mTexHeight; }
static int getTextureType() { return mTextureType; }
#endif
/**
* Merges two image SDL_Surfaces together. This is for SDL use only, as
* reducing the number of surfaces that SDL has to render can cut down
* on the number of blit operations necessary, which in turn can help
* improve overall framerates. Don't use unless you are using it to
* reduce the number of overall layers that need to be drawn through SDL.
*/
Image *merge(Image *image, int x, int y);
protected:
/**
* Constructor.
*/
#ifdef USE_OPENGL
Image(GLuint glimage, int width, int height,
int texWidth, int texHeight);
/**
* Returns the first power of two equal or bigger than the input.
*/
static int powerOfTwo(int input);
#endif
Image(SDL_Surface *image);
SDL_Rect mBounds;
bool mLoaded;
#ifdef USE_OPENGL
GLuint mGLImage;
int mTexWidth, mTexHeight;
static bool mUseOpenGL;
static int mTextureType;
static int mTextureSize;
#endif
SDL_Surface *mImage;
float mAlpha;
};
/**
* A clipped version of a larger image.
*/
class SubImage : public Image
{
public:
/**
* Constructor.
*/
SubImage(Image *parent, SDL_Surface *image,
int x, int y, int width, int height);
#ifdef USE_OPENGL
SubImage(Image *parent, GLuint image, int x, int y,
int width, int height, int texWidth, int textHeight);
#endif
/**
* Destructor.
*/
~SubImage();
/**
* Creates a new image with the desired clipping rectangle.
*
* @return <code>NULL</code> if creation failed and a valid
* image otherwise.
*/
Image *getSubImage(int x, int y, int width, int height);
private:
Image *mParent;
};
#endif
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