/*
 * FTGL - OpenGL font library
 *
 * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
 * Copyright (c) 2008 Sam Hocevar <sam@zoy.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef __FTTextureGL4GlyphImpl__
#define __FTTextureGL4GlyphImpl__

#include "FTGlyphImpl.h"

class FTTextureGL4GlyphImpl : public FTGlyphImpl
{
    friend class FTTextureGL4Glyph;
    friend class FTTextureGL4FontImpl;

    protected:
        FTTextureGL4GlyphImpl(FT_GlyphSlot glyph, int id, int xOffset,
                           int yOffset, int width, int height);

        virtual ~FTTextureGL4GlyphImpl();

        virtual const FTPoint& RenderImpl(const FTPoint& pen, int renderMode);

    private:
        /**
         * Reset the currently active texture to zero to get into a known
         * state before drawing a string. This is to get round possible
         * threading issues.
         */
        static void ResetActiveTexture() { activeTextureID = 0; }

        /**
         * The width of the glyph 'image'
         */
        int destWidth;

        /**
         * The height of the glyph 'image'
         */
        int destHeight;

        /**
         * Vector from the pen position to the topleft corner of the pixmap
         */
        FTPoint corner;

        /**
         * The texture co-ords of this glyph within the texture.
         */
        FTPoint uv[2];

        /**
         * The texture index that this glyph is contained in.
         */
        int glTextureID;

        /**
         * The texture index of the currently active texture
         *
         * We keep track of the currently active texture to try to reduce the
         * number of texture bind operations.
         */
        static GLint activeTextureID;
};

#endif  //  __FTTextureGL4GlyphImpl__