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sdlimage.cpp

/*      _______   __   __   __   ______   __   __   _______   __   __
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 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
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 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
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 */

/*
 * For comments regarding functions please see the header file.
 */

#include "guichan/sdl/sdlimage.hpp"

#include "guichan/exception.hpp"
#include "guichan/sdl/sdlpixel.hpp"

namespace gcn
{
00068     SDLImage::SDLImage(SDL_Surface* surface, bool autoFree)
    {
        mAutoFree = autoFree;
        mSurface = surface;
    }

00074     SDLImage::~SDLImage()
    {
        if (mAutoFree)
        {
            free();
        }
    }

00082     SDL_Surface* SDLImage::getSurface() const
    {
        return mSurface;
    }

00087     int SDLImage::getWidth() const
    {
        if (mSurface == NULL)
        {
            throw GCN_EXCEPTION("Trying to get the width of a non loaded image.");
        }

        return mSurface->w;
    }

00097     int SDLImage::getHeight() const
    {
        if (mSurface == NULL)
        {
            throw GCN_EXCEPTION("Trying to get the height of a non loaded image.");
        }

        return mSurface->h;
    }

00107     Color SDLImage::getPixel(int x, int y)
    {
        if (mSurface == NULL)
        {
            throw GCN_EXCEPTION("Trying to get a pixel from a non loaded image.");
        }

        return SDLgetPixel(mSurface, x, y);
    }

00117     void SDLImage::putPixel(int x, int y, const Color& color)
    {
        if (mSurface == NULL)
        {
            throw GCN_EXCEPTION("Trying to put a pixel in a non loaded image.");
        }

        SDLputPixel(mSurface, x, y, color);
    }

00127     void SDLImage::convertToDisplayFormat()
    {
        if (mSurface == NULL)
        {
            throw GCN_EXCEPTION("Trying to convert a non loaded image to display format.");
        }

        int i;
        bool hasPink = false;
        bool hasAlpha = false;

        for (i = 0; i < mSurface->w * mSurface->h; ++i)
        {
            if (((unsigned int*)mSurface->pixels)[i] == SDL_MapRGB(mSurface->format,255,0,255))
            {
                hasPink = true;
                break;
            }
        }

        for (i = 0; i < mSurface->w * mSurface->h; ++i)
        {
            Uint8 r, g, b, a;

            SDL_GetRGBA(((unsigned int*)mSurface->pixels)[i], mSurface->format,
                        &r, &g, &b, &a);

            if (a != 255)
            {
                hasAlpha = true;
                break;
            }
        }

        SDL_Surface *tmp;

        if (hasAlpha)
        {
            tmp = SDL_DisplayFormatAlpha(mSurface);
            SDL_FreeSurface(mSurface);
            mSurface = NULL;
        }
        else
        {
            tmp = SDL_DisplayFormat(mSurface);
            SDL_FreeSurface(mSurface);
            mSurface = NULL;
        }

        if (hasPink)
        {
            SDL_SetColorKey(tmp, SDL_SRCCOLORKEY,
                            SDL_MapRGB(tmp->format,255,0,255));
        }
        if (hasAlpha)
        {
            SDL_SetAlpha(tmp, SDL_SRCALPHA, 255);
        }

        mSurface = tmp;
    }

00189     void SDLImage::free()
    {
        SDL_FreeSurface(mSurface);
    }
}

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