1 /////////////////////////////////////////////////////////////////////////// 2 // 3 // Copyright (c) 2003, Industrial Light & Magic, a division of Lucas 4 // Digital Ltd. LLC 5 // 6 // All rights reserved. 7 // 8 // Redistribution and use in source and binary forms, with or without 9 // modification, are permitted provided that the following conditions are 10 // met: 11 // * Redistributions of source code must retain the above copyright 12 // notice, this list of conditions and the following disclaimer. 13 // * Redistributions in binary form must reproduce the above 14 // copyright notice, this list of conditions and the following disclaimer 15 // in the documentation and/or other materials provided with the 16 // distribution. 17 // * Neither the name of Industrial Light & Magic nor the names of 18 // its contributors may be used to endorse or promote products derived 19 // from this software without specific prior written permission. 20 // 21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 // 33 /////////////////////////////////////////////////////////////////////////// 34 35 36 #ifndef INCLUDED_IMF_PREVIEW_IMAGE_H 37 #define INCLUDED_IMF_PREVIEW_IMAGE_H 38 39 //----------------------------------------------------------------------------- 40 // 41 // class PreviewImage -- a usually small, low-dynamic range image, 42 // that is intended to be stored in an image file's header. 43 // 44 // struct PreviewRgba -- holds the value of a PreviewImage pixel. 45 // 46 //----------------------------------------------------------------------------- 47 48 namespace Imf { 49 50 51 struct PreviewRgba 52 { 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. 57 58 unsigned char a; // The pixel's alpha; 0 == transparent, 59 // 255 == opaque. 60 61 PreviewRgba (unsigned char r = 0, 62 unsigned char g = 0, 63 unsigned char b = 0, 64 unsigned char a = 255) 65 : r(r), g(g), b(b), a(a) {} 66 }; 67 68 69 class PreviewImage 70 { 71 public: 72 73 //-------------------------------------------------------------------- 74 // Constructor: 75 // 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). 83 // 84 //-------------------------------------------------------------------- 85 86 PreviewImage (unsigned int width = 0, 87 unsigned int height = 0, 88 const PreviewRgba pixels[] = 0); 89 90 //----------------------------------------------------- 91 // Copy constructor, destructor and assignment operator 92 //----------------------------------------------------- 93 94 PreviewImage (const PreviewImage &other); 95 ~PreviewImage (); 96 97 PreviewImage & operator = (const PreviewImage &other); 98 99 100 //----------------------------------------------- 101 // Access to width, height and to the pixel array 102 //----------------------------------------------- 103 104 unsigned int width () const {return _width;} 105 unsigned int height () const {return _height;} 106 107 PreviewRgba * pixels () {return _pixels;} 108 const PreviewRgba * pixels () const {return _pixels;} 109 110 111 //---------------------------- 112 // Access to individual pixels 113 //---------------------------- 114 115 PreviewRgba & pixel (unsigned int x, unsigned int y) 116 {return _pixels[y * _width + x];} 117 118 const PreviewRgba & pixel (unsigned int x, unsigned int y) const 119 {return _pixels[y * _width + x];} 120 121 private: 122 123 unsigned int _width; 124 unsigned int _height; 125 PreviewRgba * _pixels; 126 }; 127 128 129 } // namespace Imf 130 131 #endif 132
