image.h

/* Copyright (c) 2006-2016, Stefan Eilemann <eile@equalizergraphics.com>
 *                          Daniel Nachbaur <danielnachbaur@gmail.com>
 *                          Cedric Stalder <cedric.stalder@gmail.com>
 *                          Enrique <egparedes@ifi.uzh.ch>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *
 * This library 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef EQ_IMAGE_H
#define EQ_IMAGE_H

#include <eq/frame.h>         // for Frame::Buffer enum
#include <eq/types.h>

namespace eq
{
namespace detail { class Image; }

class Image
{
public:
    EQ_API Image();

    EQ_API virtual ~Image();

    EQ_API void setInternalFormat( const Frame::Buffer buffer,
                                   const uint32_t internalFormat );

    EQ_API uint32_t getInternalFormat( const Frame::Buffer buffer )const;

    EQ_API uint32_t getExternalFormat( const Frame::Buffer buffer ) const;

    EQ_API uint32_t getPixelSize( const Frame::Buffer buffer ) const;

    EQ_API bool hasAlpha() const;

    EQ_API void setStorageType( const Frame::Type type );

    EQ_API Frame::Type getStorageType() const;

    EQ_API void setPixelViewport( const PixelViewport& pvp );

    EQ_API const PixelViewport& getPixelViewport() const;

    EQ_API void setZoom( const Zoom& zoom );

    EQ_API const Zoom& getZoom() const;

    EQ_API void setContext( const RenderContext& context );

    EQ_API const RenderContext& getContext() const;

    EQ_API void useCompressor( Frame::Buffer buffer, uint32_t name );

    EQ_API void reset();

    EQ_API void flush();

    EQ_API void deleteGLObjects( util::ObjectManager& om );

    EQ_API void resetPlugins();

    EQ_API const uint8_t* getPixelPointer( const Frame::Buffer buffer )
        const;

    EQ_API uint8_t* getPixelPointer( const Frame::Buffer buffer );

    EQ_API uint32_t getPixelDataSize( const Frame::Buffer buffer ) const;

    EQ_API const PixelData& getPixelData( const Frame::Buffer ) const;

    EQ_API const PixelData& compressPixelData( const Frame::Buffer );

    EQ_API bool hasPixelData( const Frame::Buffer buffer ) const;

    EQ_API bool hasAsyncReadback( const Frame::Buffer buffer ) const;

    EQ_API bool hasAsyncReadback() const;

    EQ_API void clearPixelData( const Frame::Buffer buffer );

    EQ_API void validatePixelData( const Frame::Buffer buffer );

    EQ_API void setPixelData( const Frame::Buffer buffer,
                              const PixelData& data );

    EQ_API void setAlphaUsage( const bool enabled );

    EQ_API bool getAlphaUsage() const;

    EQ_API void setQuality( const Frame::Buffer buffer,
                            const float quality );

    EQ_API float getQuality( const Frame::Buffer buffer ) const;

    EQ_API const util::Texture& getTexture( const Frame::Buffer buffer )
        const;

    EQ_API bool hasTextureData( const Frame::Buffer buffer ) const;

    EQ_API bool startReadback( const uint32_t buffers, const PixelViewport& pvp,
                               const RenderContext& context, const Zoom& zoom,
                               util::ObjectManager& glObjects );

    bool startReadback( const Frame::Buffer buffer,
                        const util::Texture* texture,
                        const GLEWContext* glewContext );

    EQ_API void finishReadback( const GLEWContext* glewContext );

    EQ_API bool upload( const Frame::Buffer buffer, util::Texture* texture,
                        const Vector2i& position,
                        util::ObjectManager& glObjects ) const;

    EQ_API bool writeImage( const std::string& filename,
                            const Frame::Buffer buffer ) const;

    EQ_API bool writeImages( const std::string& filenameTemplate ) const;

    EQ_API bool readImage( const std::string& filename,
                           const Frame::Buffer buffer );

    void setOffset( int32_t x, int32_t y );

    EQ_API std::vector< uint32_t >
    findCompressors( const Frame::Buffer buffer ) const;

    EQ_API std::vector< uint32_t >
    findTransferers( const Frame::Buffer buffer, const GLEWContext* gl )
        const;

    EQ_API bool allocCompressor( const Frame::Buffer buffer,
                                 const uint32_t name );

    EQ_API bool allocDownloader( const Frame::Buffer buffer,
                                 const uint32_t name,
                                 const GLEWContext* glewContext );

    EQ_API uint32_t getDownloaderName( const Frame::Buffer buffer ) const;

private:
    Image( const Image& ) = delete;
    Image& operator=( const Image& )  = delete;
    detail::Image* const _impl;

    const void* _getBufferKey( const Frame::Buffer buffer ) const;

    const void* _getCompressorKey( const Frame::Buffer buffer ) const;

    void _setExternalFormat( const Frame::Buffer buffer,
                             const uint32_t externalFormat,
                             const uint32_t pixelSize,
                             const bool hasAlpha );

    bool _readback( const Frame::Buffer buffer, const Zoom& zoom,
                    util::ObjectManager& glObjects );

    bool _startReadback( const Frame::Buffer buffer, const Zoom& zoom,
                         util::ObjectManager& glObjects );

    void _finishReadback( const Frame::Buffer buffer, const GLEWContext* );
    bool _readbackZoom( const Frame::Buffer buffer, util::ObjectManager& om );
    bool _writeImage( const std::string& filename, const Frame::Buffer buffer,
                      const unsigned char* data ) const;
};
};
#endif // EQ_IMAGE_H