cairo/test/ft-svg-color-font.c

/*
 * Copyright © 2022 Adrian Johnson
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Author: Adrian Johnson <ajohnson@redneon.com>
 */

#include "cairo-test.h"
#include <cairo-ft.h>

#define FONT_SIZE 50
#define MARGIN 5
#define WIDTH  (FONT_SIZE*4 + MARGIN*2)
#define HEIGHT (FONT_SIZE*3 + MARGIN*5)

/* Check the full name to ensure we got an SVG font. */
#define FONT_FAMILY "Twitter Color Emoji"
#define FONT_FULLNAME "Twitter Color Emoji SVGinOT"

static const char spade_utf8[] =   { 0xe2, 0x99, 0xa0, 0x00 }; /* U+2660 glyph 87 */
static const char club_utf8[] =    { 0xe2, 0x99, 0xa3, 0x00 }; /* U+2663 glyph 88 */
static const char heart_utf8[] =   { 0xe2, 0x99, 0xa5, 0x00 }; /* U+2665 glyph 89 */
static const char diamond_utf8[] = { 0xe2, 0x99, 0xa6, 0x00 }; /* U+2666 glyph 90 */

static cairo_test_status_t
set_color_emoji_font (cairo_t *cr)
{
    cairo_font_options_t *font_options;
    cairo_font_face_t *font_face;
    FcPattern *pattern;
    FcPattern *resolved;
    FcChar8 *font_name;
    FcResult result;

    pattern = FcPatternCreate ();
    if (pattern == NULL)
	return CAIRO_TEST_NO_MEMORY;

    FcPatternAddString (pattern, FC_FAMILY, (FcChar8 *) FONT_FAMILY);
    FcConfigSubstitute (NULL, pattern, FcMatchPattern);

    font_options = cairo_font_options_create ();
    cairo_get_font_options (cr, font_options);
    cairo_ft_font_options_substitute (font_options, pattern);

    FcDefaultSubstitute (pattern);
    resolved = FcFontMatch (NULL, pattern, &result);
    if (resolved == NULL) {
	FcPatternDestroy (pattern);
	return CAIRO_TEST_NO_MEMORY;
    }

    if (FcPatternGetString (resolved, FC_FULLNAME, 0, &font_name) == FcResultMatch) {
        if (strcmp((char*)font_name, FONT_FULLNAME) != 0) {
            const cairo_test_context_t *ctx = cairo_test_get_context (cr);
            cairo_test_log (ctx, "Could not find %s font\n", FONT_FULLNAME);
            return CAIRO_TEST_UNTESTED;
        }
    } else {
        return CAIRO_TEST_FAILURE;
    }

    font_face = cairo_ft_font_face_create_for_pattern (resolved);
    cairo_set_font_face (cr, font_face);

    cairo_font_options_destroy (font_options);
    cairo_font_face_destroy (font_face);
    FcPatternDestroy (pattern);
    FcPatternDestroy (resolved);

    return CAIRO_TEST_SUCCESS;
}

static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
    cairo_font_options_t *font_options;
    cairo_test_status_t result;

    cairo_set_source_rgb (cr, 1, 1, 1);
    cairo_paint (cr);
    cairo_set_source_rgb (cr, 0, 0, 0);

    result = set_color_emoji_font (cr);
    if (result != CAIRO_TEST_SUCCESS)
        return result;

    cairo_set_font_size (cr, FONT_SIZE);

    /* Color glyphs */
    cairo_move_to (cr, MARGIN, FONT_SIZE + MARGIN);
    cairo_show_text (cr, diamond_utf8);
    cairo_show_text (cr, club_utf8);
    cairo_show_text (cr, heart_utf8);
    cairo_show_text (cr, spade_utf8);

    /* Non-color glyphs */
    font_options = cairo_font_options_create ();
    cairo_font_options_set_color_mode (font_options, CAIRO_COLOR_MODE_NO_COLOR);
    cairo_set_font_options (cr, font_options);
    cairo_move_to (cr, MARGIN, FONT_SIZE*2 + MARGIN*2);
    cairo_show_text (cr, diamond_utf8);
    cairo_show_text (cr, club_utf8);
    cairo_show_text (cr, heart_utf8);
    cairo_show_text (cr, spade_utf8);

    /* Color glyph text path */
    cairo_font_options_set_color_mode (font_options, CAIRO_COLOR_MODE_COLOR);
    cairo_set_font_options (cr, font_options);
    cairo_font_options_destroy (font_options);
    cairo_move_to (cr, MARGIN, FONT_SIZE*3 + MARGIN*3);
    cairo_text_path (cr, diamond_utf8);
    cairo_text_path (cr, club_utf8);
    cairo_text_path (cr, heart_utf8);
    cairo_text_path (cr, spade_utf8);
    cairo_set_line_width (cr, 1);
    cairo_stroke (cr);

    return CAIRO_TEST_SUCCESS;
}

CAIRO_TEST (ft_svg_color_font,
	    "Test color font",
	    "svgrender", /* keywords */
	    NULL, /* requirements */
	    WIDTH, HEIGHT,
	    NULL, draw)