On Tue, Feb 22, 2011 at 01:01:35PM -0500, Behdad Esfahbod wrote:
> On 02/20/11 15:29, Khaled Hosny wrote:
> > I'm suspecting that the size setting in FT_Set_Char_Size() and
> > cairo_set_font_size() don't line together, but I'm not sure what would
> > be the correct use of both.
>
> Instead of setting size on the face yourself, just get a prepared face from
> cairo using cairo_ft_scaled_font_lock_face().
I thought about this already, but it give me much worse spacing; glyps
are too widely spaced that two of them can't fit in the screen, see the
attached file.
Regards,
Khaled
--
Khaled Hosny
Egyptian
Arab
/*
$ cc `freetype-config --cflags --libs` \
`pkg-config --cflags --libs harfbuzz` \
`pkg-config --cflags --libs cairo` \
`pkg-config --cflags --libs glib-2.0` \
test_hb.c -o test_hb
$ test_hb "text" font.ttf img.png
*/
#include <cairo.h>
#include <hb-ft.h>
#include <hb-glib.h>
int
main (int argc, char *argv[])
{
int size = 128;
FT_Library ft_library;
FT_Face ft_face;
if (FT_Init_FreeType (&ft_library)) {
printf("FT_Init_FreeType failed\n");
return;
}
if (FT_New_Face (ft_library, argv[2], 0, &ft_face)) {
printf("FT_New_Face failed\n");
return;
}
// FT_Set_Char_Size (ft_face, 0, size, 0, 0);
cairo_surface_t *cr_surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, /*x+20*/1000, 300);
cairo_t *cr = cairo_create (cr_surface);
cairo_font_face_t *cr_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
cairo_set_font_face (cr, cr_face);
cairo_set_font_size (cr, size);
cairo_scaled_font_t * cr_scaled_font = cairo_get_scaled_font (cr);
FT_Face ft_face2 = cairo_ft_scaled_font_lock_face (cr_scaled_font);
char *text = argv[1];
int length = strlen(text);
hb_face_t *hb_face = hb_ft_face_create (ft_face2, NULL);
hb_font_t *hb_font = hb_ft_font_create (ft_face2, NULL);
hb_buffer_t *hb_buffer = hb_buffer_create (length);
hb_buffer_set_unicode_funcs (hb_buffer, hb_glib_get_unicode_funcs ());
hb_buffer_set_direction (hb_buffer, HB_DIRECTION_RTL);
hb_buffer_set_script (hb_buffer, HB_SCRIPT_ARABIC);
hb_buffer_set_language (hb_buffer, hb_language_from_string ("ar"));
hb_buffer_add_utf8 (hb_buffer, text, length, 0, length);
hb_shape (hb_font, hb_face, hb_buffer, NULL, 0);
cairo_ft_scaled_font_unlock_face (cr_scaled_font);
int num_glyphs = hb_buffer_get_length (hb_buffer);
hb_glyph_info_t *hb_glyph = hb_buffer_get_glyph_infos (hb_buffer);
hb_glyph_position_t *hb_position = hb_buffer_get_glyph_positions (hb_buffer);
cairo_glyph_t cr_glyphs[num_glyphs];
int i;
int32_t y, x;
y = 200;
x = 20;
for (i = 0; i < num_glyphs; i++)
{
cr_glyphs[i].index = hb_glyph->codepoint;
cr_glyphs[i].x = x + hb_position->x_offset;
cr_glyphs[i].y = y - hb_position->y_offset;
x += hb_position->x_advance;
hb_glyph++;
hb_position++;
printf("id=%ld, x=%d, y=%d\n", cr_glyphs[i].index, (int)cr_glyphs[i].x, (int)cr_glyphs[i].y);
}
cairo_show_glyphs (cr, cr_glyphs, num_glyphs);
cairo_surface_write_to_png (cr_surface, argv[3]);
return 0;
}
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