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132 lines
4.5 KiB
C++
132 lines
4.5 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2003, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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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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//-----------------------------------------------------------------------------
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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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namespace Imf {
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struct 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 (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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class 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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PreviewImage (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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PreviewImage (const PreviewImage &other);
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~PreviewImage ();
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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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unsigned int width () const {return _width;}
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unsigned int height () const {return _height;}
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PreviewRgba * pixels () {return _pixels;}
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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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PreviewRgba & pixel (unsigned int x, unsigned int y)
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{return _pixels[y * _width + x];}
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const PreviewRgba & pixel (unsigned int x, unsigned int y) const
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{return _pixels[y * _width + x];}
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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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} // namespace Imf
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#endif
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