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/* See LICENSE file for copyright and license details. */
#include "common.h"
/* TODO try normalisation if not found, then try fallback fonts */
ssize_t
libskrift_get_cluster_glyph(LIBSKRIFT_CONTEXT *ctx, const char *text, size_t text_length,
struct libskrift_saved_grapheme *saved, double x, double y, struct libskrift_glyph **glyphp)
{
struct libskrift_glyph *glyph0, *glyph1, *glyph2;
uint_least32_t cp0, cp1;
GRAPHEME_STATE state;
size_t r, len;
memset(&state, 0, sizeof(state));
*glyphp = NULL;
if (!text_length) {
errno = EINVAL;
return -1;
}
if (saved && saved->have_saved) {
cp0 = saved->cp;
len = saved->len;
} else {
len = grapheme_decode_utf8(text, text_length, &cp0);
}
if (libskrift_get_grapheme_glyph(ctx, cp0, x, y, &glyph0))
return -1;
x += glyph0->advance * ctx->char_x_advancement;
y += glyph0->advance * ctx->char_y_advancement;
for (; len < text_length; cp0 = cp1, len += r) {
r = grapheme_decode_utf8((const void *)&text[len], text_length - len, &cp1);
if (grapheme_is_character_break(cp0, cp1, &state)) {
if (saved) {
saved->have_saved = 1;
saved->cp = cp1;
saved->len = r;
}
goto out;
}
if (libskrift_get_grapheme_glyph(ctx, cp1, x, y, &glyph1)) {
free(glyph0);
return -1;
}
x += glyph1->advance * ctx->char_x_advancement;
y += glyph1->advance * ctx->char_y_advancement;
if (libskrift_merge_glyphs(ctx, glyph0, glyph1, &glyph2)) {
free(glyph0);
free(glyph1);
return -1;
}
free(glyph0);
free(glyph1);
glyph0 = glyph2;
}
if (saved) {
saved->have_saved = 0;
saved->cp = 0;
saved->len = 0;
}
out:
*glyphp = glyph0;
return (ssize_t)len;
}
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