static VALUE
cr_show_text_glyphs (VALUE self, VALUE rb_utf8, VALUE rb_glyphs,
VALUE rb_clusters, VALUE rb_cluster_flags)
{
cairo_t *cr;
const char *utf8;
int utf8_len;
cairo_glyph_t *glyphs = NULL;
int num_glyphs = 0;
cairo_text_cluster_t *clusters = NULL;
int num_clusters = 0;
cairo_text_cluster_flags_t cluster_flags;
cr = _SELF;
utf8 = RSTRING_PTR (rb_utf8);
utf8_len = RSTRING_LEN (rb_utf8);
rb_cairo__glyphs_from_ruby_object (rb_glyphs, &glyphs, &num_glyphs);
rb_cairo__text_clusters_from_ruby_object (rb_clusters,
&clusters, &num_clusters);
cluster_flags = RVAL2CRTEXTCLUSTERFLAGS (rb_cluster_flags);
cairo_show_text_glyphs (cr, utf8, utf8_len,
glyphs, num_glyphs,
clusters, num_clusters,
cluster_flags);
if (glyphs)
cairo_glyph_free (glyphs);
if (clusters)
cairo_text_cluster_free (clusters);
return self;
}
size_t render(const string& text, double x = 0.0, double y = 0.0) override {
cairo_glyph_t* glyphs{nullptr};
cairo_text_cluster_t* clusters{nullptr};
cairo_text_cluster_flags_t cf{};
int nglyphs = 0, nclusters = 0;
string utf8 = string(text);
auto status = cairo_scaled_font_text_to_glyphs(
m_scaled, x, y, utf8.c_str(), utf8.size(), &glyphs, &nglyphs, &clusters, &nclusters, &cf);
if (status != CAIRO_STATUS_SUCCESS) {
throw application_error(sstream() << "cairo_scaled_font_text_to_glyphs()" << cairo_status_to_string(status));
}
size_t bytes = 0;
for (int g = 0; g < nglyphs; g++) {
if (glyphs[g].index) {
bytes += clusters[g].num_bytes;
} else {
break;
}
}
if (bytes && bytes < text.size()) {
cairo_glyph_free(glyphs);
cairo_text_cluster_free(clusters);
utf8 = text.substr(0, bytes);
auto status = cairo_scaled_font_text_to_glyphs(
m_scaled, x, y, utf8.c_str(), utf8.size(), &glyphs, &nglyphs, &clusters, &nclusters, &cf);
if (status != CAIRO_STATUS_SUCCESS) {
throw application_error(sstream() << "cairo_scaled_font_text_to_glyphs()" << cairo_status_to_string(status));
}
}
if (bytes) {
// auto lock = make_unique<utils::device_lock>(cairo_surface_get_device(cairo_get_target(m_cairo)));
// if (lock.get()) {
// cairo_glyph_path(m_cairo, glyphs, nglyphs);
// }
cairo_text_extents_t extents{};
cairo_scaled_font_glyph_extents(m_scaled, glyphs, nglyphs, &extents);
cairo_show_text_glyphs(m_cairo, utf8.c_str(), utf8.size(), glyphs, nglyphs, clusters, nclusters, cf);
cairo_fill(m_cairo);
cairo_move_to(m_cairo, x + extents.x_advance, 0.0);
}
cairo_glyph_free(glyphs);
cairo_text_cluster_free(clusters);
return bytes;
}
static int
cr_show_text_glyphs (lua_State *L) {
cairo_t **obj = luaL_checkudata(L, 1, OOCAIRO_MT_NAME_CONTEXT);
size_t text_len;
const char *text = luaL_checklstring(L, 2, &text_len);
cairo_glyph_t *glyphs;
cairo_text_cluster_t *clusters;
cairo_text_cluster_flags_t cluster_flags;
int num_glyphs, num_clusters;
from_lua_glyph_array(L, &glyphs, &num_glyphs, 3);
from_lua_clusters_table(L, &clusters, &num_clusters, &cluster_flags, 4);
cairo_show_text_glyphs(*obj, text, text_len, glyphs, num_glyphs,
clusters, num_clusters, cluster_flags);
if (glyphs)
GLYPHS_FREE(glyphs);
if (clusters)
cairo_text_cluster_free(clusters);
return 0;
}
