147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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#include "mf_bwfont.h"
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#ifndef MF_NO_COMPILE
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#include <stdbool.h>
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/* Find the character range and index that contains a given glyph.. */
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static const struct mf_bwfont_char_range_s *find_char_range(
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const struct mf_bwfont_s *font, uint16_t character, uint16_t *index_ret)
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{
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unsigned i, index;
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const struct mf_bwfont_char_range_s *range;
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for (i = 0; i < font->char_range_count; i++)
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{
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range = &font->char_ranges[i];
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index = character - range->first_char;
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if (character >= range->first_char && index < range->char_count)
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{
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*index_ret = index;
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return range;
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}
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}
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return 0;
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}
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static uint8_t get_width(const struct mf_bwfont_char_range_s *r, uint16_t index)
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{
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if (r->width)
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{
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return r->width + r->offset_x;
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}
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else
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{
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return r->glyph_widths[index];
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}
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}
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static uint8_t render_char(const struct mf_bwfont_char_range_s *r,
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int16_t x0, int16_t y0, uint16_t index,
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mf_pixel_callback_t callback,
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void *state)
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{
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const uint8_t *data, *p;
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uint8_t stride, runlen;
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uint8_t x, y, height, num_cols;
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uint8_t bit, byte, mask;
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bool oldstate, newstate;
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if (r->width)
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{
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data = r->glyph_data + r->width * index * r->height_bytes;
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num_cols = r->width;
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}
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else
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{
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data = r->glyph_data + r->glyph_offsets[index] * r->height_bytes;
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num_cols = r->glyph_offsets[index + 1] - r->glyph_offsets[index];
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}
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stride = r->height_bytes;
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height = r->height_pixels;
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y0 += r->offset_y;
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x0 += r->offset_x;
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bit = 0;
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byte = 0;
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for (y = 0; y < height; y++)
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{
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mask = (1 << bit);
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oldstate = false;
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runlen = 0;
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p = data + byte;
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for (x = 0; x < num_cols; x++, p += stride)
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{
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newstate = *p & mask;
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if (newstate != oldstate)
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{
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if (oldstate && runlen)
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{
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callback(x0 + x - runlen, y0 + y, runlen, 255, state);
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}
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oldstate = newstate;
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runlen = 0;
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}
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runlen++;
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}
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if (oldstate && runlen)
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{
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callback(x0 + x - runlen, y0 + y, runlen, 255, state);
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}
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bit++;
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if (bit > 7)
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{
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bit = 0;
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byte++;
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}
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}
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return get_width(r, index);
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}
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uint8_t mf_bwfont_render_character(const struct mf_font_s *font,
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int16_t x0, int16_t y0,
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uint16_t character,
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mf_pixel_callback_t callback,
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void *state)
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{
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const struct mf_bwfont_s *bwfont = (const struct mf_bwfont_s*)font;
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const struct mf_bwfont_char_range_s *range;
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uint16_t index;
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range = find_char_range(bwfont, character, &index);
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if (!range)
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return 0;
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return render_char(range, x0, y0, index, callback, state);
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}
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uint8_t mf_bwfont_character_width(const struct mf_font_s *font,
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uint16_t character)
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{
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const struct mf_bwfont_s *bwfont = (const struct mf_bwfont_s*)font;
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const struct mf_bwfont_char_range_s *range;
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uint16_t index;
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range = find_char_range(bwfont, character, &index);
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if (!range)
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return 0;
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return get_width(range, index);
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}
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#endif //MF_NO_COMPILE
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