comparison: components/u8g2/csrc/u8g2_kerning.c
components/u8g2/csrc/u8g2_kerning.c
- changeset 0
- 88d965579617
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| -1:000000000000 | 0:88d965579617 |
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| 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 |
