Hash :
f81578fd
Author :
Date :
2022-02-13T19:15:36
[ot-layout] Synthesize missing baselines Add a variation of hb_ot_layout_get_baseline that synthesizes missing baselines, using heuristics in part taken from the CSS Inline Layout Module, Level 3. Includes some new tests for synthesized baselines. The base2.ttf is a subset of Noto Sans Bengali that includes just the Bengali Ka. New API: hb_ot_layout_get_baseline_with_fallback
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/*
* Copyright © 2018 Ebrahim Byagowi
*
* 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.
*/
#include "hb-test.h"
#include <hb-ot.h>
/* Unit tests for hb-ot-layout.h baseline */
static void
test_ot_layout_base (void)
{
hb_face_t *face = hb_test_open_font_file ("fonts/base.ttf");
hb_font_t *font = hb_font_create (face);
hb_position_t position;
g_assert (hb_ot_layout_get_baseline (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT, HB_DIRECTION_TTB,
HB_TAG ('h','a','n','i'),
HB_TAG ('E','N','G',' '),
&position));
g_assert_cmpint (46, ==, position);
g_assert (!hb_ot_layout_get_baseline (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT, HB_DIRECTION_TTB,
HB_TAG ('h','a','n','i'),
HB_TAG ('E','N','G',' '),
&position));
hb_font_destroy (font);
hb_face_destroy (face);
}
static void
test_ot_layout_base_with_fallback (void)
{
hb_face_t *face = hb_test_open_font_file ("fonts/base.ttf");
hb_font_t *font = hb_font_create (face);
hb_position_t position;
hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT, HB_DIRECTION_TTB,
HB_TAG ('h','a','n','i'),
HB_TAG ('E','N','G',' '),
&position);
g_assert_cmpint (46, ==, position);
hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT, HB_DIRECTION_TTB,
HB_TAG ('h','a','n','i'),
HB_TAG ('E','N','G',' '),
&position);
g_assert_cmpint (1000, ==, position);
hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_MATH, HB_DIRECTION_LTR,
HB_TAG ('h','a','n','i'),
HB_TAG ('E','N','G',' '),
&position);
g_assert_cmpint (271, ==, position);
hb_font_destroy (font);
hb_face_destroy (face);
face = hb_test_open_font_file ("fonts/base2.ttf");
font = hb_font_create (face);
hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_HANGING, HB_DIRECTION_LTR,
HB_SCRIPT_BENGALI,
HB_TAG ('E','N','G',' '),
&position);
g_assert_cmpint (622, ==, position);
hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_HANGING, HB_DIRECTION_LTR,
HB_SCRIPT_TIBETAN,
HB_TAG ('E','N','G',' '),
&position);
g_assert_cmpint (600, ==, position);
hb_font_destroy (font);
hb_face_destroy (face);
}
int
main (int argc, char **argv)
{
hb_test_init (&argc, &argv);
hb_test_add (test_ot_layout_base);
hb_test_add (test_ot_layout_base_with_fallback);
return hb_test_run();
}