// aggCanvas.h
// this file is part of Context Free
// ---------------------
// Copyright (C) 2005-2008 Mark Lentczner - markl@glyphic.com
// Copyright (C) 2006-2012 John Horigan - john@glyphic.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 
// John Horigan can be contacted at john@glyphic.com or at
// John Horigan, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
// Mark Lentczner can be contacted at markl@glyphic.com or at
// Mark Lentczner, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
//


#ifndef INCLUDE_AGGCANVAS_H
#define INCLUDE_AGGCANVAS_H

#include "cfdg.h"
#include "agg2/agg_trans_affine.h"
#include "agg2/agg_path_storage.h"
#include <map>

class aggCanvas : public Canvas {
    public:
        enum PixelFormat {
            UnknownPixelFormat = 0,
            Gray8_Blend = 1, 
            RGBA8_Blend = 2, 
            RGB8_Blend = 3,
            FF_Blend = 4,
            FF24_Blend = 5,
            AV_Blend = 6,
            Has_16bit_Color = 8,
            Has_Custom_Blend = 16,
            Gray16_Blend = Gray8_Blend | Has_16bit_Color, 
            RGBA16_Blend = RGBA8_Blend | Has_16bit_Color, 
            RGB16_Blend = RGB8_Blend | Has_16bit_Color,
            RGBA8_Custom_Blend = RGBA8_Blend | Has_Custom_Blend,
            RGBA16_Custom_Blend = RGBA16_Blend | Has_Custom_Blend,
            FF_Custom_Blend = FF_Blend | Has_Custom_Blend,
            AV_Custom_Blend = AV_Blend | Has_Custom_Blend
        };
        static const std::map<PixelFormat, int> BytesPerPixel;
        void start(bool clear, const agg::rgba& bk, int width, int height) override;
        void end() override;

        void primitive(int shape, RGBA8 c, agg::trans_affine tr, agg::comp_op_e blend) override;
        void path(RGBA8 c, agg::trans_affine tr, const AST::CommandInfo& attr) override;
        
        bool colorCount256() const;
            // return whether the aggCanvas can fit in byte pixels
        
        static PixelFormat SuggestPixelFormat(CFDG* engine);
        
    protected:
        aggCanvas(PixelFormat);
        ~aggCanvas() override;  // defined in cpp file so that it knows how
                                // to call the impl dtor
    
        void attach(void* data, unsigned width, unsigned height, int stride, bool invert = true);
            // data is int8u grayscale pixels or int32u pixels
        
        void copy(void* data, unsigned width, unsigned height,
                  int stride, PixelFormat format);
            // copy the image from different pixel buffer

    public:
        int cropX() const;
        int cropY() const;
        int cropWidth() const;
        int cropHeight() const;

        void draw(const aggCanvas& src, int x, int y);
    
    //private:
    public:
        class impl;
        std::unique_ptr<impl> m;
};

#endif // INCLUDE_AGGCANVAS_H


