crop.h

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/*
    Beatmup image and signal processing library
    Copyright (C) 2019, lnstadrum
 
    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 3 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, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
#include "../parallelism.h"
#include "../geometry.h"
#include "abstract_bitmap.h"
 
namespace Beatmup {
 
    /**
        A task to clip images on CPU.
    */
    class Crop : public AbstractTask, private BitmapContentLock {
    private:
        AbstractBitmap *input, *output;         //!< input and output bitmaps
        IntPoint outOrigin;                     //!< origin on output bitmap
        IntRectangle cropRect;                  //!< clip rect on input bitmap
    protected:
        virtual bool process(TaskThread&);
        virtual void beforeProcessing(ThreadIndex, ProcessingTarget target, GraphicPipeline*);
        virtual void afterProcessing(ThreadIndex, GraphicPipeline*, bool);
    public:
        Crop();
 
        ThreadIndex getMaxThreads() const { return 1; }
 
        void setInput(AbstractBitmap* input);
        void setOutput(AbstractBitmap* output);
 
        /**
            Sets crop rectangle in input bitmap
        */
        void setCropRect(IntRectangle);
 
        /**
            Sets top-left position of the clip rectangle in output bitmap
        */
        void setOutputOrigin(IntPoint);
 
        /**
            Checks if everything is fitted to make cropping
        */
        bool isFit() const;
 
        /**
            Copies out a specified rect of a bitmap into another bitmap
        */
        static AbstractBitmap* run(AbstractBitmap& bitmap, IntRectangle clipRect);
    };
}