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/*
* Copyright © 2009 Chris Wilson
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Chris Wilson not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Chris Wilson makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Chris Wilson <chris@chris-wilson.co.uk>
*/
#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;
/* We draw in the default black, so paint white first. */
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
cairo_paint (cr);
cairo_select_font_face (cr, "Bitstream Vera Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, TEXT_SIZE);
/* We want to overlap two strings, so compute overlapping glyphs. */
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); /* translucent black, gray! */
cairo_show_glyphs (cr, glyphs, num_glyphs);
/* and compare with filling */
cairo_translate (cr, 0, HEIGHT);
cairo_glyph_path (cr, glyphs, num_glyphs);
cairo_fill (cr);
/* switch to using an unbounded operator for added complexity */
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", /* keywords */
NULL, /* requirements */
2 * WIDTH, 2 * HEIGHT,
NULL, draw)
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