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#include <stdlib.h>
#include <stdio.h>
#include <pango/pangocairo.h>
#include "userfont.h"
#define END_GLYPH 0
#define STROKE 126
#define CLOSE 127
/* Simple glyph definition: 1 - 15 means lineto (or moveto for first
* point) for one of the points on this grid:
*
* 1 2 3
* 4 5 6
* 7 8 9
* ----10 11 12----(baseline)
* 13 14 15
*/
typedef struct
{
gunichar ucs4;
int width;
char data[16];
} test_scaled_font_glyph_t;
/* Simple glyph definition: 1 - 15 means lineto (or moveto for first
* point) for one of the points on this grid:
*
* 1 2 3
* 4 5 6
* 7 8 9
* ----10 11 12----(baseline)
* 13 14 15
*/
static const test_scaled_font_glyph_t glyphs [] = {
{ 'a', 3, { 4, 6, 12, 10, 7, 9, STROKE, END_GLYPH } },
{ 'c', 3, { 6, 4, 10, 12, STROKE, END_GLYPH } },
{ 'e', 3, { 12, 10, 4, 6, 9, 7, STROKE, END_GLYPH } },
{ 'f', 3, { 3, 2, 11, STROKE, 4, 6, STROKE, END_GLYPH } },
{ 'g', 3, { 12, 10, 4, 6, 15, 13, STROKE, END_GLYPH } },
{ 'h', 3, { 1, 10, STROKE, 7, 5, 6, 12, STROKE, END_GLYPH } },
{ 'i', 1, { 1, 1, STROKE, 4, 10, STROKE, END_GLYPH } },
{ 'l', 1, { 1, 10, STROKE, END_GLYPH } },
{ 'n', 3, { 10, 4, STROKE, 7, 5, 6, 12, STROKE, END_GLYPH } },
{ 'o', 3, { 4, 10, 12, 6, CLOSE, END_GLYPH } },
{ 'p', 3, { 4, 10, 12, 6, CLOSE, 4, 13, STROKE, END_GLYPH } },
{ 'r', 3, { 4, 10, STROKE, 7, 5, 6, STROKE, END_GLYPH } },
{ 's', 3, { 6, 4, 7, 9, 12, 10, STROKE, END_GLYPH } },
{ 't', 3, { 2, 11, 12, STROKE, 4, 6, STROKE, END_GLYPH } },
{ 'u', 3, { 4, 10, 12, 6, STROKE, END_GLYPH } },
{ 'y', 3, { 4, 10, 12, 6, STROKE, 12, 15, 13, STROKE, END_GLYPH } },
{ 'z', 3, { 4, 6, 10, 12, STROKE, END_GLYPH } },
{ ' ', 1, { END_GLYPH } },
{ '-', 2, { 7, 8, STROKE, END_GLYPH } },
{ '.', 1, { 10, 10, STROKE, END_GLYPH } },
{ 0xe000, 3, { 3, 2, 11, STROKE, 4, 6, STROKE, 3, 3, STROKE, 6, 12, STROKE, END_GLYPH } }, /* fi */
{ -1, 0, { END_GLYPH } },
};
static gboolean
glyph_cb (PangoUserFace *face,
hb_codepoint_t unicode,
hb_codepoint_t *glyph,
gpointer user_data)
{
test_scaled_font_glyph_t *glyphs = user_data;
for (int i = 0; glyphs[i].ucs4 != (gunichar) -1; i++)
{
if (glyphs[i].ucs4 == unicode)
{
*glyph = i;
return TRUE;
}
}
return FALSE;
}
static gboolean
glyph_info_cb (PangoUserFace *face,
int size,
hb_codepoint_t glyph,
hb_glyph_extents_t *extents,
hb_position_t *h_advance,
hb_position_t *v_advance,
gboolean *is_color,
gpointer user_data)
{
test_scaled_font_glyph_t *glyphs = user_data;
extents->x_bearing = 0;
extents->y_bearing = 0.75 * size;
extents->width = glyphs[glyph].width / 4.0 * size;
extents->height = - size;
*h_advance = *v_advance = glyphs[glyph].width / 4.0 * size;
*is_color = FALSE;
return TRUE;
}
static gboolean
font_info_cb (PangoUserFace *face,
int size,
hb_font_extents_t *extents,
gpointer user_data)
{
extents->ascender = 0.75 * size;
extents->descender = - 0.25 * size;
extents->line_gap = 0;
return TRUE;
}
static gboolean
render_cb (PangoUserFace *face,
int size,
hb_codepoint_t glyph,
gpointer user_data,
const char *backend_id,
gpointer backend_data)
{
test_scaled_font_glyph_t *glyphs = user_data;
cairo_t *cr = backend_data;
const char *data;
div_t d;
double x, y;
if (strcmp (backend_id, "cairo") != 0)
return FALSE;
cairo_set_line_width (cr, 0.1);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
data = glyphs[glyph].data;
for (int i = 0; data[i] != END_GLYPH; i++)
{
switch (data[i])
{
case STROKE:
cairo_new_sub_path (cr);
break;
case CLOSE:
cairo_close_path (cr);
break;
default:
d = div (data[i] - 1, 3);
x = d.rem / 4.0 + 0.125;
y = d.quot / 5.0 + 0.4 - 1.0;
cairo_line_to (cr, x, y);
}
}
cairo_stroke (cr);
return TRUE;
}
void
add_userfont (PangoFontMap *fontmap)
{
PangoFontDescription *desc;
PangoUserFace *face;
desc = pango_font_description_new ();
pango_font_description_set_family (desc, "Userfont");
face = pango_user_face_new (font_info_cb,
glyph_cb,
glyph_info_cb,
NULL,
render_cb,
(gpointer) glyphs, NULL,
"Black", desc);
pango_font_map_add_face (fontmap, PANGO_FONT_FACE (face));
pango_font_description_free (desc);
}
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