95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
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/*
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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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