HarfBuzz Memory Leak

gistfile1.cpp

// g++ -o leak leak.cc -Iharfbuzz/src -Ifreetype/include -lharfbuzz -lfreetype

#include "hb-ft.h"

int main(int argc, char** argv) {
    FT_Library library;
    FT_Init_FreeType(&library);
    FT_Face face;
    FT_New_Face(library, "Chunkfive.otf", 0, &face);
    FT_Set_Pixel_Sizes(face, 0, 40);

    const char text[] = "_";
    // Infinite create/destroy loop. Leaks memory.
    for (;;) {
        hb_font_t* font = hb_ft_font_create(face, 0);
        hb_buffer_t* buffer = hb_buffer_create();
        
        hb_buffer_add_utf8(buffer, text, strlen(text), 0, strlen(text));
        hb_feature_t feature;
        // The leak most probably doesn't depend on the type of the feature.
        feature.tag = hb_tag_from_string("kern", 4);
        feature.value = 0;
        feature.start = 0;
        feature.end = (unsigned int) -1;
        int num_features = 1;
        // With zero features, the leak disappears. (Uncomment the next line.)
        // num_features = 0;
        hb_shape(font, buffer, &feature, num_features);

        hb_buffer_destroy(buffer);
        hb_font_destroy(font);
    }

    FT_Done_Face(face);
    FT_Done_FreeType(library);

    return 0;
}