MyGUI_MaskPickInfo.cpp

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */
 
#include "MyGUI_Precompiled.h"
#include "MyGUI_MaskPickInfo.h"
#include "MyGUI_ResourceManager.h"
#include "MyGUI_RenderManager.h"
#include "MyGUI_DataManager.h"
 
namespace MyGUI
{
 
    MaskPickInfo::MaskPickInfo() :
        mWidth(0),
        mHeight(0)
    {
    }
 
    bool MaskPickInfo::load(const std::string& _file)
    {
        if (!DataManager::getInstance().isDataExist(_file))
            return false;
 
        RenderManager& render = RenderManager::getInstance();
        ITexture* texture = render.createTexture(_file);
        texture->loadFromFile(_file);
 
        uint8* buffer = (uint8*)texture->lock(TextureUsage::Read);
        if (buffer == nullptr)
        {
            render.destroyTexture(texture);
            return false;
        }
 
        size_t pixel_size = texture->getNumElemBytes();
 
        mWidth = texture->getWidth();
        mHeight = texture->getHeight();
        size_t size = mWidth * mHeight;
        mData.resize(size);
 
        size_t pos = 0;
        for (size_t pos_pix = 0; pos_pix < size; pos_pix++)
        {
            bool white = true;
            for (size_t in_pix = 0; in_pix < pixel_size; in_pix++)
            {
                if (0xFF != buffer[pos])
                {
                    white = false;
                }
                pos++;
            }
 
            mData[pos_pix] = white;
        }
 
        texture->unlock();
        render.destroyTexture(texture);
 
        return true;
    }
 
    bool MaskPickInfo::pick(const IntPoint& _point, const IntCoord& _coord) const
    {
        if ((0 == _coord.width) || (0 == _coord.height)) return false;
 
        int x = ((_point.left * mWidth) - 1) / _coord.width;
        int y = ((_point.top * mHeight) - 1) / _coord.height;
 
        return 0 != mData[(size_t)(y * mWidth + x)];
    }
 
    bool MaskPickInfo::empty() const
    {
        return mData.empty();
    }
 
} // namespace MyGUI