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