gui_imageloader.cpp

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/***************************************************************************
 *   Copyright (C) 2005-2019 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
 *   This file is part of FIFE.                                            *
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 *   FIFE is free software; you can redistribute it and/or                 *
 *   modify it under the terms of the GNU Lesser General Public            *
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 *   This library is distributed in the hope that it will be useful,       *
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 *   Lesser General Public License for more details.                       *
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 *   Free Software Foundation, Inc.,                                       *
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// Standard C++ library includes

// 3rd party library includes

// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "video/image.h"
#include "video/imagemanager.h"
#include "video/atlasbook.h"
#include "video/renderbackend.h"

#include "gui_imageloader.h"

static const uint32_t ATLAS_SIZE = 512;

namespace FIFE {
    GuiImageLoader::GuiImageLoader() {
        m_atlasbook = new AtlasBook(ATLAS_SIZE, ATLAS_SIZE);
    }

    GuiImageLoader::~GuiImageLoader() {
        delete m_atlasbook;
    }

    fcn::Image* GuiImageLoader::load(const std::string& filename, bool convertToDisplayFormat) {
        ImageManager* imgManager = ImageManager::instance();

        if(imgManager->exists(filename)) {
            return new GuiImage(imgManager->get(filename));
        }
        // load demanded image
        ImagePtr tmpimg = imgManager->load(filename);
        if(tmpimg->getWidth() >= ATLAS_SIZE || tmpimg->getHeight() >= ATLAS_SIZE) {
            return new GuiImage(tmpimg);
        }
        // look for a place for an image of given size
        AtlasBlock* block = m_atlasbook->getBlock(tmpimg->getWidth(), tmpimg->getHeight());

        // if it can't fit, we need to add new 'page'
        if(block->page >= m_atlases.size()) {
            m_atlases.push_back(imgManager->loadBlank(ATLAS_SIZE, ATLAS_SIZE));

            // because we gonna update texture on-the fly (via TexSubImage)
            // we cant really use compressed texture 
            RenderBackend* rb = RenderBackend::instance();
            bool prev = rb->isImageCompressingEnabled();
            rb->setImageCompressingEnabled(false);
            m_atlases[block->page]->forceLoadInternal();
            rb->setImageCompressingEnabled(prev);
        }
        
        // update atlas page with given image
        m_atlases[block->page]->copySubimage(block->left, block->top, tmpimg);
    
        // we dont really need this image anymore 
        tmpimg->free();
        imgManager->remove(tmpimg);

        // create shared image and return it
        ImagePtr img = imgManager->create(filename);
        Rect region(block->left, block->top, block->getWidth(), block->getHeight());
        img->useSharedImage(m_atlases[block->page], region);

        return new GuiImage(img);
    }
}