///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2007, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
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// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
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///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IMF_ACES_FILE_H
#define INCLUDED_IMF_ACES_FILE_H
//-----------------------------------------------------------------------------
//
// ACES image file I/O.
//
// This header file declares two classes that directly support
// image file input and output according to the Academy Image
// Interchange Framework.
//
// The Academy Image Interchange file format is a subset of OpenEXR:
//
// - Images are stored as scanlines. Tiles are not allowed.
//
// - Images contain three color channels, either
// R, G, B (red, green, blue) or
// Y, RY, BY (luminance, sub-sampled chroma)
//
// - Images may optionally contain an alpha channel.
//
// - Only three compression types are allowed:
// - NO_COMPRESSION (file is not compressed)
// - PIZ_COMPRESSION (lossless)
// - B44A_COMPRESSION (lossy)
//
// - The "chromaticities" header attribute must specify
// the ACES RGB primaries and white point.
//
// class AcesOutputFile writes an OpenEXR file, enforcing the
// restrictions listed above. Pixel data supplied by application
// software must already be in the ACES RGB space.
//
// class AcesInputFile reads an OpenEXR file. Pixel data delivered
// to application software is guaranteed to be in the ACES RGB space.
// If the RGB space of the file is not the same as the ACES space,
// then the pixels are automatically converted: the pixels are
// converted to CIE XYZ, a color adaptation transform shifts the
// white point, and the result is converted to ACES RGB.
//
//-----------------------------------------------------------------------------
#include <ImfHeader.h>
#include <ImfRgba.h>
#include "ImathVec.h"
#include "ImathBox.h"
#include <ImfThreading.h>
#include <string>
namespace Imf {
class RgbaOutputFile;
class RgbaInputFile;
struct PreviewRgba;
struct Chromaticities;
//
// ACES red, green, blue and white-point chromaticities.
//
const Chromaticities & acesChromaticities ();
//
// ACES output file.
//
class AcesOutputFile
{
public:
//---------------------------------------------------
// Constructor -- header is constructed by the caller
//---------------------------------------------------
AcesOutputFile (const std::string &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.
//----------------------------------------------------
AcesOutputFile (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")
//----------------------------------------------------------------
AcesOutputFile (const std::string &name,
const Imath::Box2i &displayWindow,
const Imath::Box2i &dataWindow = Imath::Box2i(),
RgbaChannels rgbaChannels = WRITE_RGBA,
float pixelAspectRatio = 1,
const Imath::V2f screenWindowCenter = Imath::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))
//-----------------------------------------------
AcesOutputFile (const std::string &name,
int width,
int height,
RgbaChannels rgbaChannels = WRITE_RGBA,
float pixelAspectRatio = 1,
const Imath::V2f screenWindowCenter = Imath::V2f (0, 0),
float screenWindowWidth = 1,
LineOrder lineOrder = INCREASING_Y,
Compression compression = PIZ_COMPRESSION,
int numThreads = globalThreadCount());
//-----------
// Destructor
//-----------
virtual ~AcesOutputFile ();
//------------------------------------------------
// 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)
// The pixels are assumed to contain ACES RGB data.
//-------------------------------------------------
void writePixels (int numScanLines = 1);
int currentScanLine () const;
//--------------------------
// Access to the file header
//--------------------------
const Header & header () const;
const Imath::Box2i & displayWindow () const;
const Imath::Box2i & dataWindow () const;
float pixelAspectRatio () const;
const Imath::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[]);
private:
AcesOutputFile (const AcesOutputFile &); // not implemented
AcesOutputFile & operator = (const AcesOutputFile &); // not implemented
class Data;
Data * _data;
};
//
// ACES input file
//
class AcesInputFile
{
public:
//-------------------------------------------------------
// Constructor -- opens the file with the specified name,
// destructor will automatically close the file.
//-------------------------------------------------------
AcesInputFile (const std::string &name,
int numThreads = globalThreadCount());
//-----------------------------------------------------------
// Constructor -- attaches the new AcesInputFile object to a
// file that has already been opened by the caller.
// Destroying the AcesInputFile object will not automatically
// close the file.
//-----------------------------------------------------------
AcesInputFile (IStream &is,
int numThreads = globalThreadCount());
//-----------
// Destructor
//-----------
virtual ~AcesInputFile ();
//-----------------------------------------------------
// 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);
//--------------------------------------------
// Read pixel data (see class Imf::InputFile)
// Pixels returned will contain ACES RGB data.
//--------------------------------------------
void readPixels (int scanLine1, int scanLine2);
void readPixels (int scanLine);
//--------------------------
// Access to the file header
//--------------------------
const Header & header () const;
const Imath::Box2i & displayWindow () const;
const Imath::Box2i & dataWindow () const;
float pixelAspectRatio () const;
const Imath::V2f screenWindowCenter () const;
float screenWindowWidth () const;
LineOrder lineOrder () const;
Compression compression () const;
RgbaChannels channels () const;
const char * fileName () const;
bool isComplete () const;
//----------------------------------
// Access to the file format version
//----------------------------------
int version () const;
private:
AcesInputFile (const AcesInputFile &); // not implemented
AcesInputFile & operator = (const AcesInputFile &); // not implemented
class Data;
Data * _data;
};
} // namespace Imf
#endif