harfbuzz/test/api/test-subset-glyf.c

185 lines
6.6 KiB
C

/*
* Copyright © 2018 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Garret Rieger
*/
#include <stdbool.h>
#include "hb-test.h"
#include "hb-subset-test.h"
/* Unit tests for hb-subset-glyf.h */
static void check_maxp_field (uint8_t *raw_maxp, unsigned int offset, uint16_t expected_value)
{
uint16_t actual_value = (raw_maxp[offset] << 8) + raw_maxp[offset + 1];
g_assert_cmpuint(expected_value, ==, actual_value);
}
static void check_maxp_num_glyphs (hb_face_t *face, uint16_t expected_num_glyphs, bool hints)
{
hb_blob_t *maxp_blob = hb_face_reference_table (face, HB_TAG ('m','a','x', 'p'));
unsigned int maxp_len;
uint8_t *raw_maxp = (uint8_t *) hb_blob_get_data(maxp_blob, &maxp_len);
check_maxp_field (raw_maxp, 4, expected_num_glyphs); // numGlyphs
if (!hints)
{
check_maxp_field (raw_maxp, 14, 1); // maxZones
check_maxp_field (raw_maxp, 16, 0); // maxTwilightPoints
check_maxp_field (raw_maxp, 18, 0); // maxStorage
check_maxp_field (raw_maxp, 20, 0); // maxFunctionDefs
check_maxp_field (raw_maxp, 22, 0); // maxInstructionDefs
check_maxp_field (raw_maxp, 24, 0); // maxStackElements
check_maxp_field (raw_maxp, 26, 0); // maxSizeOfInstructions
}
hb_blob_destroy (maxp_blob);
}
static void
test_subset_glyf (void)
{
hb_face_t *face_abc = hb_subset_test_open_font ("fonts/Roboto-Regular.abc.ttf");
hb_face_t *face_ac = hb_subset_test_open_font ("fonts/Roboto-Regular.ac.ttf");
hb_set_t *codepoints = hb_set_create();
hb_set_add (codepoints, 97);
hb_set_add (codepoints, 99);
hb_face_t *face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
hb_set_destroy (codepoints);
hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
check_maxp_num_glyphs(face_abc_subset, 3, true);
hb_face_destroy (face_abc_subset);
hb_face_destroy (face_abc);
hb_face_destroy (face_ac);
}
static void
test_subset_glyf_with_components (void)
{
hb_face_t *face_components = hb_subset_test_open_font ("fonts/Roboto-Regular.components.ttf");
hb_face_t *face_subset = hb_subset_test_open_font ("fonts/Roboto-Regular.components.subset.ttf");
hb_set_t *codepoints = hb_set_create();
hb_set_add (codepoints, 0x1fc);
hb_face_t *face_generated_subset = hb_subset_test_create_subset (face_components, hb_subset_test_create_input (codepoints));
hb_set_destroy (codepoints);
hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
check_maxp_num_glyphs(face_generated_subset, 4, true);
hb_face_destroy (face_generated_subset);
hb_face_destroy (face_subset);
hb_face_destroy (face_components);
}
static void
test_subset_glyf_noop (void)
{
hb_face_t *face_abc = hb_subset_test_open_font("fonts/Roboto-Regular.abc.ttf");
hb_set_t *codepoints = hb_set_create();
hb_set_add (codepoints, 97);
hb_set_add (codepoints, 98);
hb_set_add (codepoints, 99);
hb_face_t *face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
hb_set_destroy (codepoints);
hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('g','l','y','f'));
hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('l','o','c', 'a'));
check_maxp_num_glyphs(face_abc_subset, 4, true);
hb_face_destroy (face_abc_subset);
hb_face_destroy (face_abc);
}
static void
test_subset_glyf_strip_hints_simple (void)
{
hb_face_t *face_abc = hb_subset_test_open_font ("fonts/Roboto-Regular.abc.ttf");
hb_face_t *face_ac = hb_subset_test_open_font ("fonts/Roboto-Regular.ac.nohints.ttf");
hb_set_t *codepoints = hb_set_create();
hb_set_add (codepoints, 'a');
hb_set_add (codepoints, 'c');
hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
*hb_subset_input_drop_hints(input) = true;
hb_face_t *face_abc_subset = hb_subset_test_create_subset (face_abc, input);
hb_set_destroy (codepoints);
hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
check_maxp_num_glyphs(face_abc_subset, 3, false);
hb_face_destroy (face_abc_subset);
hb_face_destroy (face_abc);
hb_face_destroy (face_ac);
}
// TODO(rsheeter): test strip hints from composite
static void
test_subset_glyf_strip_hints_composite (void)
{
hb_face_t *face_components = hb_subset_test_open_font ("fonts/Roboto-Regular.components.ttf");
hb_face_t *face_subset = hb_subset_test_open_font ("fonts/Roboto-Regular.components.subset.ttf");
hb_set_t *codepoints = hb_set_create();
hb_set_add (codepoints, 0x1fc);
hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
*hb_subset_input_drop_hints(input) = true;
hb_face_t *face_generated_subset = hb_subset_test_create_subset (face_components, input);
hb_set_destroy (codepoints);
hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
check_maxp_num_glyphs(face_generated_subset, 4);
hb_face_destroy (face_generated_subset);
hb_face_destroy (face_subset);
hb_face_destroy (face_components);
}
// TODO(grieger): test for long loca generation.
int
main (int argc, char **argv)
{
hb_test_init (&argc, &argv);
hb_test_add (test_subset_glyf_noop);
hb_test_add (test_subset_glyf);
hb_test_add (test_subset_glyf_strip_hints_simple);
hb_test_add (test_subset_glyf_strip_hints_composite);
hb_test_add (test_subset_glyf_with_components);
return hb_test_run();
}