Current File : //usr/include/OpenEXR/ImfRgbaFile.h
///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
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// * Redistributions in binary form must reproduce the above
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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
//--------------------------
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;
const char * fileName () const;
bool isComplete () const;
//----------------------------------
// 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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