180 lines
3.0 KiB
C
180 lines
3.0 KiB
C
/*
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bdf_8x8.c
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unencoded font format for 8x8 pixel font
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offset bytes desc
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0 1 first char
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1 2 last char
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2 n font data, n = (last char - first char + 1)*8
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "bdf_font.h"
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int bg_8x8_convert(bg_t *bg, bbx_t *bbx)
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{
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int x;
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int y;
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int d;
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if ( bbx == NULL )
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bbx = &(bg->bbx);
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bg_ClearTargetData(bg);
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if ( bbx->w != 8 )
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return 0;
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if ( bbx->h != 8 )
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return 0;
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/*
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for( y = bbx->y+bbx->h-1; y >= bbx->y; y--)
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{
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d = 0;
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for( x = bbx->x; x < bbx->x + bbx->w; x++)
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{
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d <<= 1;
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if ( bg_GetBBXPixel(bg, x, y) != 0 )
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{
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d++;
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}
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}
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if ( bg_AddTargetData(bg, d) < 0 )
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return 0;
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}
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*/
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for( x = bbx->x; x < bbx->x + bbx->w; x++)
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{
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d = 0;
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for( y = bbx->y+bbx->h-1; y >= bbx->y; y--)
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{
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d >>= 1;
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if ( bg_GetBBXPixel(bg, x, y) != 0 )
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{
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d |= 128;
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}
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}
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if ( bg_AddTargetData(bg, d) < 0 )
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return 0;
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}
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return 1;
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}
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void bf_Generate8x8Font(bf_t *bf)
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{
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int i, j, k;
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bg_t *bg;
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int first, last;
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bbx_t local_bbx;
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int is_glyph_written;
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/* Step 1: Generate 8x8 bitmap data */
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for( i = 0; i < bf->glyph_cnt; i++ )
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{
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bg = bf->glyph_list[i];
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if ( bg->map_to >= 0 )
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{
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bf_copy_bbx_and_update_shift(bf, &local_bbx, bg);
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if ( local_bbx.w != 8 )
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{
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bf_Log(bf, "Generate8x8Font: Error, glyph width is not 8, width=%d, encoding=%d", local_bbx.w, bg->encoding);
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}
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else
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{
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if ( local_bbx.h != 8 )
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{
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bf_Log(bf, "Generate8x8Font: Error, glyph height is not 8, height=%d, encoding=%d", local_bbx.h, bg->encoding);
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}
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else
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{
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if ( bg_8x8_convert(bg, &local_bbx) == 0 )
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{
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bf_Log(bf, "Generate8x8Font: Error, 8x8 conversion, encoding=%d", bg->target_cnt, bg->encoding);
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}
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}
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}
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}
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}
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/* Step 2: Calculate first and last char */
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first = -1;
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last = -1;
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for( j = 0; j < 256; j++ )
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{
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for( i = 0; i < bf->glyph_cnt; i++ )
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{
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bg = bf->glyph_list[i];
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if ( bg->map_to == j )
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{
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if ( bg->target_data != NULL )
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{
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if ( bg->target_cnt != 8)
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{
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bf_Log(bf, "Generate8x8Font: Error, glyph size is not 8, size=%d, encoding=%d", bg->target_cnt, bg->encoding);
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}
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else
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{
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if ( first < 0 )
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first = j;
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last = j;
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}
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}
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}
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}
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}
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/* Step 3: Write font data */
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bf_AddTargetData(bf, first);
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bf_AddTargetData(bf, last);
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for( j = first; j <= last; j++ )
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{
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is_glyph_written = 0;
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for( i = 0; i < bf->glyph_cnt; i++ )
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{
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bg = bf->glyph_list[i];
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if ( bg->map_to == j )
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{
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if ( bg->target_data != NULL )
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{
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if ( bg->target_cnt == 8)
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{
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for( k = 0; k < bg->target_cnt; k++ )
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{
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bf_AddTargetData(bf, bg->target_data[k]);
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}
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is_glyph_written = 1;
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}
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}
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}
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}
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if ( is_glyph_written == 0 )
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{
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for( k = 0; k < 8; k++ )
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{
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bf_AddTargetData(bf, 0);
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}
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}
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}
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bf_Log(bf, "Generate8x8Font: Font size %d", bf->target_cnt);
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} |