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94 lines
2.8 KiB
94 lines
2.8 KiB
/* |
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u8g2_kerning.c |
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) |
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Copyright (c) 2016, olikraus@gmail.com |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without modification, |
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are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright notice, this list |
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of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright notice, this |
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list of conditions and the following disclaimer in the documentation and/or other |
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materials provided with the distribution. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "u8g2.h" |
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/* this function is used as "u8g2_get_kerning_cb" */ |
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/* |
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uint8_t u8g2_GetNullKerning(u8g2_t *u8g2, uint16_t e1, uint16_t e2) |
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{ |
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return 0; |
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} |
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*/ |
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/* this function is used as "u8g2_get_kerning_cb" */ |
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uint8_t u8g2_GetKerning(U8X8_UNUSED u8g2_t *u8g2, u8g2_kerning_t *kerning, uint16_t e1, uint16_t e2) |
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{ |
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uint16_t i1, i2, cnt, end; |
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if ( kerning == NULL ) |
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return 0; |
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/* search for the encoding in the first table */ |
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cnt = kerning->first_table_cnt; |
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cnt--; /* ignore the last element of the table, which is 0x0ffff */ |
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for( i1 = 0; i1 < cnt; i1++ ) |
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{ |
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if ( kerning->first_encoding_table[i1] == e1 ) |
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break; |
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} |
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if ( i1 >= cnt ) |
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return 0; /* e1 not part of the kerning table, return 0 */ |
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/* get the upper index for i2 */ |
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end = kerning->index_to_second_table[i1+1]; |
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for( i2 = kerning->index_to_second_table[i1]; i2 < end; i2++ ) |
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{ |
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if ( kerning->second_encoding_table[i2] == e2 ) |
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break; |
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} |
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if ( i2 >= end ) |
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return 0; /* e2 not part of any pair with e1, return 0 */ |
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return kerning->kerning_values[i2]; |
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} |
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uint8_t u8g2_GetKerningByTable(U8X8_UNUSED u8g2_t *u8g2, const uint16_t *kt, uint16_t e1, uint16_t e2) |
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{ |
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uint16_t i; |
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i = 0; |
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if ( kt == NULL ) |
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return 0; |
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for(;;) |
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{ |
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if ( kt[i] == 0x0ffff ) |
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break; |
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if ( kt[i] == e1 && kt[i+1] == e2 ) |
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return kt[i+2]; |
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i+=3; |
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} |
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return 0; |
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} |
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