| 1 | /* |
| 2 | |
| 3 | u8g2_kerning.c |
| 4 | |
| 5 | Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) |
| 6 | |
| 7 | Copyright (c) 2016, olikraus@gmail.com |
| 8 | All rights reserved. |
| 9 | |
| 10 | Redistribution and use in source and binary forms, with or without modification, |
| 11 | are permitted provided that the following conditions are met: |
| 12 | |
| 13 | * Redistributions of source code must retain the above copyright notice, this list |
| 14 | of conditions and the following disclaimer. |
| 15 | |
| 16 | * Redistributions in binary form must reproduce the above copyright notice, this |
| 17 | list of conditions and the following disclaimer in the documentation and/or other |
| 18 | materials provided with the distribution. |
| 19 | |
| 20 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| 21 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 22 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 23 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| 25 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 26 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 27 | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 29 | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 30 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 31 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 32 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | |
| 34 | */ |
| 35 | |
| 36 | #include "u8g2.h" |
| 37 | |
| 38 | /* this function is used as "u8g2_get_kerning_cb" */ |
| 39 | /* |
| 40 | uint8_t u8g2_GetNullKerning(u8g2_t *u8g2, uint16_t e1, uint16_t e2) |
| 41 | { |
| 42 | return 0; |
| 43 | } |
| 44 | */ |
| 45 | |
| 46 | /* this function is used as "u8g2_get_kerning_cb" */ |
| 47 | uint8_t u8g2_GetKerning(U8X8_UNUSED u8g2_t *u8g2, u8g2_kerning_t *kerning, uint16_t e1, uint16_t e2) |
| 48 | { |
| 49 | uint16_t i1, i2, cnt, end; |
| 50 | if ( kerning == NULL ) |
| 51 | return 0; |
| 52 | |
| 53 | /* search for the encoding in the first table */ |
| 54 | cnt = kerning->first_table_cnt; |
| 55 | cnt--; /* ignore the last element of the table, which is 0x0ffff */ |
| 56 | for( i1 = 0; i1 < cnt; i1++ ) |
| 57 | { |
| 58 | if ( kerning->first_encoding_table[i1] == e1 ) |
| 59 | break; |
| 60 | } |
| 61 | if ( i1 >= cnt ) |
| 62 | return 0; /* e1 not part of the kerning table, return 0 */ |
| 63 | |
| 64 | /* get the upper index for i2 */ |
| 65 | end = kerning->index_to_second_table[i1+1]; |
| 66 | for( i2 = kerning->index_to_second_table[i1]; i2 < end; i2++ ) |
| 67 | { |
| 68 | if ( kerning->second_encoding_table[i2] == e2 ) |
| 69 | break; |
| 70 | } |
| 71 | |
| 72 | if ( i2 >= end ) |
| 73 | return 0; /* e2 not part of any pair with e1, return 0 */ |
| 74 | |
| 75 | return kerning->kerning_values[i2]; |
| 76 | } |
| 77 | |
| 78 | uint8_t u8g2_GetKerningByTable(U8X8_UNUSED u8g2_t *u8g2, const uint16_t *kt, uint16_t e1, uint16_t e2) |
| 79 | { |
| 80 | uint16_t i; |
| 81 | i = 0; |
| 82 | if ( kt == NULL ) |
| 83 | return 0; |
| 84 | for(;;) |
| 85 | { |
| 86 | if ( kt[i] == 0x0ffff ) |
| 87 | break; |
| 88 | if ( kt[i] == e1 && kt[i+1] == e2 ) |
| 89 | return kt[i+2]; |
| 90 | i+=3; |
| 91 | } |
| 92 | return 0; |
| 93 | } |
| 94 | |