// ColorLUT.cc for Fluxbox Window Manager // Copyright (c) 2013 - Mathias Gumz // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. #include "ColorLUT.hh" namespace FbTk { // created by: // // #include // #include // int main(int argc, char **argv) { // // double s = 1.0; // // if (argc > 1) { // s = atof(argv[1]); // } // // size_t i; unsigned char c; double v; // for (i = 0; i < 256; ++i) { // c = 255; // v = s * i; // if (v < c) // c = (unsigned char)v; // write(1, &c, 1); // } // // return 0; // } // // and then piped to 'xxd -i' // ./a.out 1.5 | xxd -i -c 8 # value + (value >> 1)) // #if 0 // unused const unsigned char ColorLUT::PRE_MULTIPLY_1_5[256] = { 0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0c, 0x0d, 0x0f, 0x10, 0x12, 0x13, 0x15, 0x16, 0x18, 0x19, 0x1b, 0x1c, 0x1e, 0x1f, 0x21, 0x22, 0x24, 0x25, 0x27, 0x28, 0x2a, 0x2b, 0x2d, 0x2e, 0x30, 0x31, 0x33, 0x34, 0x36, 0x37, 0x39, 0x3a, 0x3c, 0x3d, 0x3f, 0x40, 0x42, 0x43, 0x45, 0x46, 0x48, 0x49, 0x4b, 0x4c, 0x4e, 0x4f, 0x51, 0x52, 0x54, 0x55, 0x57, 0x58, 0x5a, 0x5b, 0x5d, 0x5e, 0x60, 0x61, 0x63, 0x64, 0x66, 0x67, 0x69, 0x6a, 0x6c, 0x6d, 0x6f, 0x70, 0x72, 0x73, 0x75, 0x76, 0x78, 0x79, 0x7b, 0x7c, 0x7e, 0x7f, 0x81, 0x82, 0x84, 0x85, 0x87, 0x88, 0x8a, 0x8b, 0x8d, 0x8e, 0x90, 0x91, 0x93, 0x94, 0x96, 0x97, 0x99, 0x9a, 0x9c, 0x9d, 0x9f, 0xa0, 0xa2, 0xa3, 0xa5, 0xa6, 0xa8, 0xa9, 0xab, 0xac, 0xae, 0xaf, 0xb1, 0xb2, 0xb4, 0xb5, 0xb7, 0xb8, 0xba, 0xbb, 0xbd, 0xbe, 0xc0, 0xc1, 0xc3, 0xc4, 0xc6, 0xc7, 0xc9, 0xca, 0xcc, 0xcd, 0xcf, 0xd0, 0xd2, 0xd3, 0xd5, 0xd6, 0xd8, 0xd9, 0xdb, 0xdc, 0xde, 0xdf, 0xe1, 0xe2, 0xe4, 0xe5, 0xe7, 0xe8, 0xea, 0xeb, 0xed, 0xee, 0xf0, 0xf1, 0xf3, 0xf4, 0xf6, 0xf7, 0xf9, 0xfa, 0xfc, 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; // ./a.out 1.125 | xxd -i -c 8 # value + (value >> 3) const unsigned char ColorLUT::PRE_MULTIPLY_1_125[256] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; #endif // ./a.out 0.75 | xxd -i -c 8 # (value >> 1) + (value >> 2)) const unsigned char ColorLUT::PRE_MULTIPLY_0_75[256] = { 0x00, 0x00, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x09, 0x09, 0x0a, 0x0b, 0x0c, 0x0c, 0x0d, 0x0e, 0x0f, 0x0f, 0x10, 0x11, 0x12, 0x12, 0x13, 0x14, 0x15, 0x15, 0x16, 0x17, 0x18, 0x18, 0x19, 0x1a, 0x1b, 0x1b, 0x1c, 0x1d, 0x1e, 0x1e, 0x1f, 0x20, 0x21, 0x21, 0x22, 0x23, 0x24, 0x24, 0x25, 0x26, 0x27, 0x27, 0x28, 0x29, 0x2a, 0x2a, 0x2b, 0x2c, 0x2d, 0x2d, 0x2e, 0x2f, 0x30, 0x30, 0x31, 0x32, 0x33, 0x33, 0x34, 0x35, 0x36, 0x36, 0x37, 0x38, 0x39, 0x39, 0x3a, 0x3b, 0x3c, 0x3c, 0x3d, 0x3e, 0x3f, 0x3f, 0x40, 0x41, 0x42, 0x42, 0x43, 0x44, 0x45, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b, 0x4b, 0x4c, 0x4d, 0x4e, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x54, 0x55, 0x56, 0x57, 0x57, 0x58, 0x59, 0x5a, 0x5a, 0x5b, 0x5c, 0x5d, 0x5d, 0x5e, 0x5f, 0x60, 0x60, 0x61, 0x62, 0x63, 0x63, 0x64, 0x65, 0x66, 0x66, 0x67, 0x68, 0x69, 0x69, 0x6a, 0x6b, 0x6c, 0x6c, 0x6d, 0x6e, 0x6f, 0x6f, 0x70, 0x71, 0x72, 0x72, 0x73, 0x74, 0x75, 0x75, 0x76, 0x77, 0x78, 0x78, 0x79, 0x7a, 0x7b, 0x7b, 0x7c, 0x7d, 0x7e, 0x7e, 0x7f, 0x80, 0x81, 0x81, 0x82, 0x83, 0x84, 0x84, 0x85, 0x86, 0x87, 0x87, 0x88, 0x89, 0x8a, 0x8a, 0x8b, 0x8c, 0x8d, 0x8d, 0x8e, 0x8f, 0x90, 0x90, 0x91, 0x92, 0x93, 0x93, 0x94, 0x95, 0x96, 0x96, 0x97, 0x98, 0x99, 0x99, 0x9a, 0x9b, 0x9c, 0x9c, 0x9d, 0x9e, 0x9f, 0x9f, 0xa0, 0xa1, 0xa2, 0xa2, 0xa3, 0xa4, 0xa5, 0xa5, 0xa6, 0xa7, 0xa8, 0xa8, 0xa9, 0xaa, 0xab, 0xab, 0xac, 0xad, 0xae, 0xae, 0xaf, 0xb0, 0xb1, 0xb1, 0xb2, 0xb3, 0xb4, 0xb4, 0xb5, 0xb6, 0xb7, 0xb7, 0xb8, 0xb9, 0xba, 0xba, 0xbb, 0xbc, 0xbd, 0xbd, 0xbe, 0xbf }; // created by: // // #include // #include // #include // // int main(int argc, char const *argv[]) { // // size_t i; // unsigned char c; // unsigned int v; // unsigned int s = 4; // // if (argc > 1) { // s = atoi(argv[1]); // } // // for (i = 0; i < 256; ++i) { // v = i + ((0xff - i) / s); // c = (unsigned char)v; // write(1, &c, 1); // } // // return 0; // } // // math behind: // // rgb-color-space forms a cube. to make // something "brighter" one has to nudge a // given color towards "white" (255, 255, 255). // we use simple vector math to do this: // // (nred ) (red ) ((255) (red )) // (ngreen) = (green) + s * ((255) - (green)) // (nblue ) (blue ) ((255) (blue )) // // this approach is better than just multiplying // a given color by a factor (ColorLUT::PRE_MULTIPLY*) // example: // // brighten_via_premultiply_*(#ff0000) = #ff0000 // brighten_via_brighter_4(#ff0000) = #ffef3f // // right now the calculation of 's' is pretty // straightforward: it is just 1/nth of the length // of the vector-component. a more precise approach // would calculate the length of the vector via // sqrt(red * red + green * green + blue * blue) and // scale that value down, allthough this would // need either adhoc-computation or a more advanced // lookup-table. right now the simple approach is // sufficient. // // to make a color "darker" one has to nudge the // color towards "black" (0, 0, 0). the formula // from above changes to // // (nred) = (0) + s * ((red) - 0) // ... // // which simplifies down to (s * red) .. which is // covered by PRE_MULTIPLY_0_75 already. // ./a.out 4 | xxd -i -c 8 const unsigned char ColorLUT::BRIGHTER_4[256] = { 0x3f, 0x40, 0x41, 0x42, 0x42, 0x43, 0x44, 0x45, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b, 0x4b, 0x4c, 0x4d, 0x4e, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x54, 0x55, 0x56, 0x57, 0x57, 0x58, 0x59, 0x5a, 0x5a, 0x5b, 0x5c, 0x5d, 0x5d, 0x5e, 0x5f, 0x60, 0x60, 0x61, 0x62, 0x63, 0x63, 0x64, 0x65, 0x66, 0x66, 0x67, 0x68, 0x69, 0x69, 0x6a, 0x6b, 0x6c, 0x6c, 0x6d, 0x6e, 0x6f, 0x6f, 0x70, 0x71, 0x72, 0x72, 0x73, 0x74, 0x75, 0x75, 0x76, 0x77, 0x78, 0x78, 0x79, 0x7a, 0x7b, 0x7b, 0x7c, 0x7d, 0x7e, 0x7e, 0x7f, 0x80, 0x81, 0x81, 0x82, 0x83, 0x84, 0x84, 0x85, 0x86, 0x87, 0x87, 0x88, 0x89, 0x8a, 0x8a, 0x8b, 0x8c, 0x8d, 0x8d, 0x8e, 0x8f, 0x90, 0x90, 0x91, 0x92, 0x93, 0x93, 0x94, 0x95, 0x96, 0x96, 0x97, 0x98, 0x99, 0x99, 0x9a, 0x9b, 0x9c, 0x9c, 0x9d, 0x9e, 0x9f, 0x9f, 0xa0, 0xa1, 0xa2, 0xa2, 0xa3, 0xa4, 0xa5, 0xa5, 0xa6, 0xa7, 0xa8, 0xa8, 0xa9, 0xaa, 0xab, 0xab, 0xac, 0xad, 0xae, 0xae, 0xaf, 0xb0, 0xb1, 0xb1, 0xb2, 0xb3, 0xb4, 0xb4, 0xb5, 0xb6, 0xb7, 0xb7, 0xb8, 0xb9, 0xba, 0xba, 0xbb, 0xbc, 0xbd, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, 0xc1, 0xc2, 0xc3, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xc9, 0xca, 0xcb, 0xcc, 0xcc, 0xcd, 0xce, 0xcf, 0xcf, 0xd0, 0xd1, 0xd2, 0xd2, 0xd3, 0xd4, 0xd5, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb, 0xdb, 0xdc, 0xdd, 0xde, 0xde, 0xdf, 0xe0, 0xe1, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7, 0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xed, 0xee, 0xef, 0xf0, 0xf0, 0xf1, 0xf2, 0xf3, 0xf3, 0xf4, 0xf5, 0xf6, 0xf6, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff }; // ./a.out 8 | xxd -i -c 8 const unsigned char ColorLUT::BRIGHTER_8[256] = { 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff }; #if 0 // unused // ./a.out 4 | xxd -i -c 8 const unsigned char ColorLUT::BRIGHTER_16[256] = { 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff }; #endif }