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/* See LICENSE file for copyright and license details. */
#include "common.h"
static void
reverse_text(const char *restrict text, size_t text_length, char *restrict s)
{
size_t n, off = text_length;
for (; text_length; text += n, text_length -= n) {
off -= n = grapheme_bytelen(text);
memcpy(&s[off], text, n);
}
}
int
libskrift_draw_text(LIBSKRIFT_CONTEXT *ctx, const char *text, size_t text_length,
const struct libskrift_colour *colour, int16_t x, int16_t y, struct libskrift_image *image)
{
struct libskrift_saved_grapheme saved = LIBSKRIFT_NO_SAVED_GRAPHEME;
struct libskrift_glyph *glyph;
char *buffer = NULL;
double xpos = 0, ypos = 0;
ssize_t len;
int r;
if (ctx->rendering.flags & LIBSKRIFT_MIRROR_TEXT) {
if (text_length < 1024) {
buffer = alloca(text_length + 1);
} else {
buffer = malloc(text_length + 1);
if (!buffer)
return -1;
}
reverse_text(text, text_length, buffer);
text = buffer;
if (text_length < 1024)
buffer = NULL;
}
for (; text_length; text += len, text_length -= (size_t)len) {
len = libskrift_get_cluster_glyph(ctx, text, text_length, &saved, xpos, ypos, &glyph);
if (len < 0) {
free(buffer);
return -1;
}
r = libskrift_apply_glyph(ctx, glyph, colour, x, y, image);
xpos += (glyph->advance + ctx->rendering.interletter_spacing) * ctx->x_advancement;
ypos += (glyph->advance + ctx->rendering.interletter_spacing) * ctx->y_advancement;
free(glyph);
if (r) {
free(buffer);
return -1;
}
}
free(buffer);
return 0;
}
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