PBRT
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00001 00002 // 00003 // Copyright (c) 2003, Industrial Light & Magic, a division of Lucas 00004 // Digital Ltd. LLC 00005 // 00006 // All rights reserved. 00007 // 00008 // Redistribution and use in source and binary forms, with or without 00009 // modification, are permitted provided that the following conditions are 00010 // met: 00011 // * Redistributions of source code must retain the above copyright 00012 // notice, this list of conditions and the following disclaimer. 00013 // * Redistributions in binary form must reproduce the above 00014 // copyright notice, this list of conditions and the following disclaimer 00015 // in the documentation and/or other materials provided with the 00016 // distribution. 00017 // * Neither the name of Industrial Light & Magic nor the names of 00018 // its contributors may be used to endorse or promote products derived 00019 // from this software without specific prior written permission. 00020 // 00021 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00022 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00023 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00024 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00025 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00026 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00027 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00028 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00029 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00030 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00031 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00032 // 00034 00035 00036 #ifndef INCLUDED_IMF_PREVIEW_IMAGE_H 00037 #define INCLUDED_IMF_PREVIEW_IMAGE_H 00038 00039 //----------------------------------------------------------------------------- 00040 // 00041 // class PreviewImage -- a usually small, low-dynamic range image, 00042 // that is intended to be stored in an image file's header. 00043 // 00044 // struct PreviewRgba -- holds the value of a PreviewImage pixel. 00045 // 00046 //----------------------------------------------------------------------------- 00047 00048 namespace Imf { 00049 00050 00051 struct PreviewRgba 00052 { 00053 unsigned char r; // Red, green and blue components of 00054 unsigned char g; // the pixel's color; intensity is 00055 unsigned char b; // proportional to pow (x/255, 2.2), 00056 // where x is r, g, or b. 00057 00058 unsigned char a; // The pixel's alpha; 0 == transparent, 00059 // 255 == opaque. 00060 00061 PreviewRgba (unsigned char r = 0, 00062 unsigned char g = 0, 00063 unsigned char b = 0, 00064 unsigned char a = 255) 00065 : r(r), g(g), b(b), a(a) {} 00066 }; 00067 00068 00069 class PreviewImage 00070 { 00071 public: 00072 00073 //-------------------------------------------------------------------- 00074 // Constructor: 00075 // 00076 // PreviewImage(w,h,p) constructs a preview image with w by h pixels 00077 // whose initial values are specified in pixel array p. The x and y 00078 // coordinates of the pixels in p go from 0 to w-1, and from 0 to h-1. 00079 // The pixel with coordinates (x, y) is at address p + y*w + x. 00080 // Pixel (0, 0) is in the upper left corner of the preview image. 00081 // If p is zero, the pixels in the preview image are initialized with 00082 // (r = 0, b = 0, g = 0, a = 255). 00083 // 00084 //-------------------------------------------------------------------- 00085 00086 PreviewImage (unsigned int width = 0, 00087 unsigned int height = 0, 00088 const PreviewRgba pixels[] = 0); 00089 00090 //----------------------------------------------------- 00091 // Copy constructor, destructor and assignment operator 00092 //----------------------------------------------------- 00093 00094 PreviewImage (const PreviewImage &other); 00095 ~PreviewImage (); 00096 00097 PreviewImage & operator = (const PreviewImage &other); 00098 00099 00100 //----------------------------------------------- 00101 // Access to width, height and to the pixel array 00102 //----------------------------------------------- 00103 00104 unsigned int width () const {return _width;} 00105 unsigned int height () const {return _height;} 00106 00107 PreviewRgba * pixels () {return _pixels;} 00108 const PreviewRgba * pixels () const {return _pixels;} 00109 00110 00111 //---------------------------- 00112 // Access to individual pixels 00113 //---------------------------- 00114 00115 PreviewRgba & pixel (unsigned int x, unsigned int y) 00116 {return _pixels[y * _width + x];} 00117 00118 const PreviewRgba & pixel (unsigned int x, unsigned int y) const 00119 {return _pixels[y * _width + x];} 00120 00121 private: 00122 00123 unsigned int _width; 00124 unsigned int _height; 00125 PreviewRgba * _pixels; 00126 }; 00127 00128 00129 } // namespace Imf 00130 00131 #endif