1 ///////////////////////////////////////////////////////////////////////////
3 // Copyright (c) 2003, Industrial Light & Magic, a division of Lucas
6 // All rights reserved.
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33 ///////////////////////////////////////////////////////////////////////////
36 #ifndef INCLUDED_IMF_PREVIEW_IMAGE_H
37 #define INCLUDED_IMF_PREVIEW_IMAGE_H
39 //-----------------------------------------------------------------------------
41 // class PreviewImage -- a usually small, low-dynamic range image,
42 // that is intended to be stored in an image file's header.
44 // struct PreviewRgba -- holds the value of a PreviewImage pixel.
46 //-----------------------------------------------------------------------------
53 unsigned char r; // Red, green and blue components of
54 unsigned char g; // the pixel's color; intensity is
55 unsigned char b; // proportional to pow (x/255, 2.2),
56 // where x is r, g, or b.
58 unsigned char a; // The pixel's alpha; 0 == transparent,
61 PreviewRgba (unsigned char r = 0,
64 unsigned char a = 255)
65 : r(r), g(g), b(b), a(a) {}
73 //--------------------------------------------------------------------
76 // PreviewImage(w,h,p) constructs a preview image with w by h pixels
77 // whose initial values are specified in pixel array p. The x and y
78 // coordinates of the pixels in p go from 0 to w-1, and from 0 to h-1.
79 // The pixel with coordinates (x, y) is at address p + y*w + x.
80 // Pixel (0, 0) is in the upper left corner of the preview image.
81 // If p is zero, the pixels in the preview image are initialized with
82 // (r = 0, b = 0, g = 0, a = 255).
84 //--------------------------------------------------------------------
86 PreviewImage (unsigned int width = 0,
87 unsigned int height = 0,
88 const PreviewRgba pixels[] = 0);
90 //-----------------------------------------------------
91 // Copy constructor, destructor and assignment operator
92 //-----------------------------------------------------
94 PreviewImage (const PreviewImage &other);
97 PreviewImage & operator = (const PreviewImage &other);
100 //-----------------------------------------------
101 // Access to width, height and to the pixel array
102 //-----------------------------------------------
104 unsigned int width () const {return _width;}
105 unsigned int height () const {return _height;}
107 PreviewRgba * pixels () {return _pixels;}
108 const PreviewRgba * pixels () const {return _pixels;}
111 //----------------------------
112 // Access to individual pixels
113 //----------------------------
115 PreviewRgba & pixel (unsigned int x, unsigned int y)
116 {return _pixels[y * _width + x];}
118 const PreviewRgba & pixel (unsigned int x, unsigned int y) const
119 {return _pixels[y * _width + x];}
124 unsigned int _height;
125 PreviewRgba * _pixels;