Current File : //usr/include/OpenEXR/ImfPreviewImage.h
//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//
#ifndef INCLUDED_IMF_PREVIEW_IMAGE_H
#define INCLUDED_IMF_PREVIEW_IMAGE_H
#include "ImfForward.h"
//-----------------------------------------------------------------------------
//
// class PreviewImage -- a usually small, low-dynamic range image,
// that is intended to be stored in an image file's header.
//
// struct PreviewRgba -- holds the value of a PreviewImage pixel.
//
//-----------------------------------------------------------------------------
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
struct IMF_EXPORT_TYPE PreviewRgba
{
unsigned char r; // Red, green and blue components of
unsigned char g; // the pixel's color; intensity is
unsigned char b; // proportional to pow (x/255, 2.2),
// where x is r, g, or b.
unsigned char a; // The pixel's alpha; 0 == transparent,
// 255 == opaque.
PreviewRgba (unsigned char r = 0,
unsigned char g = 0,
unsigned char b = 0,
unsigned char a = 255)
: r(r), g(g), b(b), a(a) {}
};
class IMF_EXPORT_TYPE PreviewImage
{
public:
//--------------------------------------------------------------------
// Constructor:
//
// PreviewImage(w,h,p) constructs a preview image with w by h pixels
// whose initial values are specified in pixel array p. The x and y
// coordinates of the pixels in p go from 0 to w-1, and from 0 to h-1.
// The pixel with coordinates (x, y) is at address p + y*w + x.
// Pixel (0, 0) is in the upper left corner of the preview image.
// If p is zero, the pixels in the preview image are initialized with
// (r = 0, b = 0, g = 0, a = 255).
//
//--------------------------------------------------------------------
IMF_EXPORT
PreviewImage (unsigned int width = 0,
unsigned int height = 0,
const PreviewRgba pixels[] = 0);
//-----------------------------------------------------
// Copy constructor, destructor and assignment operator
//-----------------------------------------------------
IMF_EXPORT
PreviewImage (const PreviewImage &other);
IMF_EXPORT
~PreviewImage ();
IMF_EXPORT
PreviewImage & operator = (const PreviewImage &other);
//-----------------------------------------------
// Access to width, height and to the pixel array
//-----------------------------------------------
inline
unsigned int width () const {return _width;}
inline
unsigned int height () const {return _height;}
inline
PreviewRgba * pixels () {return _pixels;}
inline
const PreviewRgba * pixels () const {return _pixels;}
//----------------------------
// Access to individual pixels
//----------------------------
inline
PreviewRgba & pixel (unsigned int x, unsigned int y)
{return _pixels[y * _width + x];}
inline
const PreviewRgba & pixel (unsigned int x, unsigned int y) const
{return _pixels[y * _width + x];}
private:
unsigned int _width;
unsigned int _height;
PreviewRgba * _pixels;
};
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
#endif
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