overlapping-glyphs.c [plain text]
#include "cairo-test.h"
#include <assert.h>
#define TEXT_SIZE 12
#define HEIGHT (TEXT_SIZE + 4)
#define WIDTH 50
#define MAX_GLYPHS 80
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_glyph_t glyphs_stack[MAX_GLYPHS], *glyphs;
const char *cairo = "Cairo";
const char *giza = "Giza";
cairo_text_extents_t cairo_extents;
cairo_text_extents_t giza_extents;
int count, num_glyphs;
double x0, y0;
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, TEXT_SIZE);
cairo_text_extents (cr, cairo, &cairo_extents);
cairo_text_extents (cr, giza, &giza_extents);
x0 = WIDTH/2. - (cairo_extents.width/2. + cairo_extents.x_bearing);
y0 = HEIGHT/2. - (cairo_extents.height/2. + cairo_extents.y_bearing);
glyphs = glyphs_stack;
count = MAX_GLYPHS;
cairo_scaled_font_text_to_glyphs (cairo_get_scaled_font (cr),
x0, y0,
cairo, strlen (cairo),
&glyphs, &count,
NULL, NULL,
NULL);
assert (glyphs == glyphs_stack);
num_glyphs = count;
x0 = WIDTH/2. - (giza_extents.width/2. + giza_extents.x_bearing);
y0 = HEIGHT/2. - (giza_extents.height/2. + giza_extents.y_bearing);
glyphs = glyphs_stack + count;
count = MAX_GLYPHS - count;
cairo_scaled_font_text_to_glyphs (cairo_get_scaled_font (cr),
x0, y0,
giza, strlen (giza),
&glyphs, &count,
NULL, NULL,
NULL);
assert (glyphs == glyphs_stack + num_glyphs);
glyphs = glyphs_stack;
num_glyphs += count;
cairo_set_source_rgba (cr, 0, 0, 0, .5);
cairo_show_glyphs (cr, glyphs, num_glyphs);
cairo_translate (cr, 0, HEIGHT);
cairo_glyph_path (cr, glyphs, num_glyphs);
cairo_fill (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_IN);
cairo_translate (cr, WIDTH, -HEIGHT);
cairo_save (cr);
cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
cairo_clip (cr);
cairo_show_glyphs (cr, glyphs, num_glyphs);
cairo_restore (cr);
cairo_translate (cr, 0, HEIGHT);
cairo_save (cr);
cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
cairo_clip (cr);
cairo_glyph_path (cr, glyphs, num_glyphs);
cairo_fill (cr);
cairo_restore (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (overlapping_glyphs,
"Test handing of overlapping glyphs",
"text, glyphs",
NULL,
2 * WIDTH, 2 * HEIGHT,
NULL, draw)