79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
#include "./aligner.h"
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#include <assert.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include "util/gleasy/atlas.h"
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#include "util/math/algorithm.h"
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#include "./cache.h"
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void glyphas_aligner_initialize(
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glyphas_aligner_t* aligner,
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glyphas_aligner_direction_t dir,
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int32_t lineheight,
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int32_t maxpos) {
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assert(aligner != NULL);
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assert(maxpos > 0);
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*aligner = (typeof(*aligner)) {
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.dir = dir,
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.lineheight = lineheight,
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.maxpos = maxpos,
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.line = lineheight,
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};
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}
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void glyphas_aligner_deinitialize(glyphas_aligner_t* aligner) {
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assert(aligner != NULL);
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}
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void glyphas_aligner_reset(glyphas_aligner_t* aligner) {
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assert(aligner != NULL);
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aligner->line = aligner->lineheight;
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aligner->pos = 0;
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}
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void glyphas_aligner_push_character(
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glyphas_aligner_t* aligner,
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int32_t* x,
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int32_t* y,
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const glyphas_cache_glyph_t* g) {
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assert(aligner != NULL);
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assert(x != NULL);
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assert(y != NULL);
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assert(g != NULL);
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switch (aligner->dir) {
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case GLYPHAS_ALIGNER_DIRECTION_HORIZONTAL:
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if (aligner->pos + g->hmetrics.advance > aligner->maxpos) {
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glyphas_aligner_break_line(aligner);
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}
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*x = aligner->pos + g->hmetrics.bear_x;
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*y = g->hmetrics.bear_y + aligner->line;
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aligner->pos += g->hmetrics.advance;
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break;
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case GLYPHAS_ALIGNER_DIRECTION_VERTICAL:
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if (aligner->pos - g->vmetrics.advance < -aligner->maxpos) {
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glyphas_aligner_break_line(aligner);
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}
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*x = aligner->pos - g->vmetrics.bear_x + aligner->line;
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*y = -g->vmetrics.bear_y;
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aligner->pos -= g->vmetrics.advance;
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break;
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default:
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assert(false);
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}
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}
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void glyphas_aligner_break_line(glyphas_aligner_t* aligner) {
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assert(aligner != NULL);
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aligner->pos = 0;
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aligner->line += aligner->lineheight;
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}
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