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✏️ Editing: ImfRgbaFile.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
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///////////////////////////////////////////////////////////////////////////

#ifndef INCLUDED_IMF_RGBA_FILE_H
#define INCLUDED_IMF_RGBA_FILE_H

//-----------------------------------------------------------------------------
//
//	Simplified RGBA image I/O
//
//	class RgbaOutputFile
//	class RgbaInputFile
//
//-----------------------------------------------------------------------------

#include "ImfHeader.h"
#include "ImfFrameBuffer.h"
#include "ImfRgba.h"
#include "ImathVec.h"
#include "ImathBox.h"
#include "half.h"
#include "ImfThreading.h"
#include <string>
#include "ImfNamespace.h"
#include "ImfForward.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

//
// RGBA output file.
//

class IMF_EXPORT RgbaOutputFile
{
  public:

//---------------------------------------------------
    // Constructor -- header is constructed by the caller
    //---------------------------------------------------

RgbaOutputFile (const char name[],
		    const Header &header,
		    RgbaChannels rgbaChannels = WRITE_RGBA,
                    int numThreads = globalThreadCount());

//----------------------------------------------------
    // Constructor -- header is constructed by the caller,
    // file is opened by the caller, destructor will not
    // automatically close the file.
    //----------------------------------------------------

RgbaOutputFile (OPENEXR_IMF_INTERNAL_NAMESPACE::OStream &os,
		    const Header &header,
		    RgbaChannels rgbaChannels = WRITE_RGBA,
                    int numThreads = globalThreadCount());

//----------------------------------------------------------------
    // Constructor -- header data are explicitly specified as function
    // call arguments (empty dataWindow means "same as displayWindow")
    //----------------------------------------------------------------

RgbaOutputFile (const char name[],
		    const IMATH_NAMESPACE::Box2i &displayWindow,
		    const IMATH_NAMESPACE::Box2i &dataWindow = IMATH_NAMESPACE::Box2i(),
		    RgbaChannels rgbaChannels = WRITE_RGBA,
		    float pixelAspectRatio = 1,
		    const IMATH_NAMESPACE::V2f screenWindowCenter = IMATH_NAMESPACE::V2f (0, 0),
		    float screenWindowWidth = 1,
		    LineOrder lineOrder = INCREASING_Y,
		    Compression compression = PIZ_COMPRESSION,
                    int numThreads = globalThreadCount());

//-----------------------------------------------
    // Constructor -- like the previous one, but both
    // the display window and the data window are
    // Box2i (V2i (0, 0), V2i (width - 1, height -1))
    //-----------------------------------------------

RgbaOutputFile (const char name[],
		    int width,
		    int height,
		    RgbaChannels rgbaChannels = WRITE_RGBA,
		    float pixelAspectRatio = 1,
		    const IMATH_NAMESPACE::V2f screenWindowCenter = IMATH_NAMESPACE::V2f (0, 0),
		    float screenWindowWidth = 1,
		    LineOrder lineOrder = INCREASING_Y,
		    Compression compression = PIZ_COMPRESSION,
                    int numThreads = globalThreadCount());

//-----------
    // Destructor
    //-----------

virtual ~RgbaOutputFile ();

//------------------------------------------------
    // Define a frame buffer as the pixel data source:
    // Pixel (x, y) is at address
    //
    //  base + x * xStride + y * yStride
    //
    //------------------------------------------------

void			setFrameBuffer (const Rgba *base,
						size_t xStride,
						size_t yStride);

//---------------------------------------------
    // Write pixel data (see class Imf::OutputFile)
    //---------------------------------------------

void			writePixels (int numScanLines = 1);
    int				currentScanLine () const;

//--------------------------
    // Access to the file header
    //--------------------------

const Header &		header () const;
    const FrameBuffer &		frameBuffer () const;
    const IMATH_NAMESPACE::Box2i &	displayWindow () const;
    const IMATH_NAMESPACE::Box2i &	dataWindow () const;
    float			pixelAspectRatio () const;
    const IMATH_NAMESPACE::V2f		screenWindowCenter () const;
    float			screenWindowWidth () const;
    LineOrder			lineOrder () const;
    Compression			compression () const;
    RgbaChannels		channels () const;

// --------------------------------------------------------------------
    // Update the preview image (see Imf::OutputFile::updatePreviewImage())
    // --------------------------------------------------------------------

void			updatePreviewImage (const PreviewRgba[]);

//-----------------------------------------------------------------------
    // Rounding control for luminance/chroma images:
    //
    // If the output file contains luminance and chroma channels (WRITE_YC
    // or WRITE_YCA), then the the significands of the luminance and
    // chroma values are rounded to roundY and roundC bits respectively (see
    // function half::round()).  Rounding improves compression with minimal
    // image degradation, usually much less than the degradation caused by
    // chroma subsampling.  By default, roundY is 7, and roundC is 5.
    //
    // If the output file contains RGB channels or a luminance channel,
    // without chroma, then no rounding is performed.
    //-----------------------------------------------------------------------

void			setYCRounding (unsigned int roundY,
					       unsigned int roundC);

//----------------------------------------------------
    // Break a scan line -- for testing and debugging only
    // (see Imf::OutputFile::updatePreviewImage()
    //
    // Warning: Calling this function usually results in a
    // broken image file.  The file or parts of it may not
    // be readable, or the file may contain bad data.
    //
    //----------------------------------------------------

void			breakScanLine  (int y,
						int offset,
						int length,
						char c);
  private:

RgbaOutputFile (const RgbaOutputFile &);		  // not implemented
    RgbaOutputFile & operator = (const RgbaOutputFile &); // not implemented

class ToYca;

OutputFile *		_outputFile;
    ToYca *			_toYca;
};

//
// RGBA input file
//

class IMF_EXPORT RgbaInputFile
{
  public:

//-------------------------------------------------------
    // Constructor -- opens the file with the specified name,
    // destructor will automatically close the file.
    //-------------------------------------------------------

RgbaInputFile (const char name[], int numThreads = globalThreadCount());

//-----------------------------------------------------------
    // Constructor -- attaches the new RgbaInputFile object to a
    // file that has already been opened by the caller.
    // Destroying the RgbaInputFile object will not automatically
    // close the file.
    //-----------------------------------------------------------

RgbaInputFile (OPENEXR_IMF_INTERNAL_NAMESPACE::IStream &is, int numThreads = globalThreadCount());

//--------------------------------------------------------------
    // Constructors -- the same as the previous two, but the names
    // of the red, green, blue, alpha, luminance and chroma channels
    // are expected to be layerName.R, layerName.G, etc.
    //--------------------------------------------------------------

RgbaInputFile (const char name[],
		   const std::string &layerName,
		   int numThreads = globalThreadCount());

RgbaInputFile (OPENEXR_IMF_INTERNAL_NAMESPACE::IStream &is,
		   const std::string &layerName,
		   int numThreads = globalThreadCount());

//-----------
    // Destructor
    //-----------

virtual ~RgbaInputFile ();

//-----------------------------------------------------
    // Define a frame buffer as the pixel data destination:
    // Pixel (x, y) is at address
    //
    //  base + x * xStride + y * yStride
    //
    //-----------------------------------------------------

void			setFrameBuffer (Rgba *base,
						size_t xStride,
						size_t yStride);

//----------------------------------------------------------------
    // Switch to a different layer -- subsequent calls to readPixels()
    // will read channels layerName.R, layerName.G, etc.
    // After each call to setLayerName(), setFrameBuffer() must be
    // called at least once before the next call to readPixels().
    //----------------------------------------------------------------

void			setLayerName (const std::string &layerName);

//-------------------------------------------
    // Read pixel data (see class Imf::InputFile)
    //-------------------------------------------

void			readPixels (int scanLine1, int scanLine2);
    void			readPixels (int scanLine);

//--------------------------
    // Access to the file header
    //--------------------------

//----------------------------------
    // Access to the file format version
    //----------------------------------

int				version () const;

private:

RgbaInputFile (const RgbaInputFile &);		  // not implemented
    RgbaInputFile & operator = (const RgbaInputFile &);   // not implemented

class FromYca;

InputFile *			_inputFile;
    FromYca *			_fromYca;
    std::string			_channelNamePrefix;
};

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif

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