From 8dc86d07036e0d251ab6817230651f8943693db8 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Mon, 1 Nov 2021 19:57:11 -0400
Subject: [PATCH] Add a test font scale rounding behavior

This test verifies the fix for
https://github.com/harfbuzz/harfbuzz/issues/3274
---
 test/api/Makefile.am           |   1 +
 test/api/fonts/Cantarell.A.otf | Bin 0 -> 1956 bytes
 test/api/meson.build           |   1 +
 test/api/test-font-scale.c     |  57 +++++++++++++++++++++++++++++++++
 4 files changed, 59 insertions(+)
 create mode 100644 test/api/fonts/Cantarell.A.otf
 create mode 100644 test/api/test-font-scale.c

diff --git a/test/api/Makefile.am b/test/api/Makefile.am
index a491a17df..883464cea 100644
--- a/test/api/Makefile.am
+++ b/test/api/Makefile.am
@@ -38,6 +38,7 @@ TEST_PROGS = \
 	test-common \
 	test-draw \
 	test-font \
+	test-font-scale \
 	test-map \
 	test-object \
 	test-ot-alternates \
diff --git a/test/api/fonts/Cantarell.A.otf b/test/api/fonts/Cantarell.A.otf
new file mode 100644
index 0000000000000000000000000000000000000000..da06ff7e11d5cac9a7b89f09e21fef5f65c1163f
GIT binary patch
literal 1956
zcmZ`)TTEP46kX@eTo|rcr$CEo2E475Ql(I7V`!^Q2Pl|!5G(`Qq@fJ287i*~!^3FR
zDjMy8LFz;kC2jiA4>W3Gf{pQm7>$WBQPXJaBhu6#LegL&3It?a``#(7MbFLIXRrM_
z`*8-U{QfGeSAY}l((>{m?aho#KzX=JD#{L)qZ3Jh)&QWOqPnW4EaK}W9wE-IsHrWv
zxO{Pj_(S5nN9w#s%AQoO6JH@Ntt6gVyiy1_7!T!DHHAgBU-je@HxoD1_`UvTjYy36
zbK=%OUm*Nf`lk1o3~i9z)Dh@LD&8RW5$|rL{`6SeDDm^ezEDe`+4<StIpVL09}H2D
zJf_+K-ASAi>WB<DTd{{YkJ!}_80dypO;+DYlGGXKXxX*@*e2p)=Irb4>WRe9q6kPH
zq~6q^BRz{;S!#|P{`EpVcas3QVAGhLP!Fj#iAl1+0e;rfNJXoZGCX)#eCyLlGzuKs
zj8n0NzSw+y?EP4j>(w*S=<tieMWbgjla~5p(U+qm!<ot1=NgZvru<y><xr;a-O)dW
zGVfrlbcVT8DLudNKt<(aN87rei^hiBi-(q8Id#9Wv|;&~&<_*7VfTjl*}={scT)7y
zOToISVYj|CJ2p#v?mlC5{N#{(<F!NAw;Lbi8RPlJu-kF3vDr|g3k%~X-=^&rW2;d)
zonth7^fb{6Bh7T2Kk>I)j{Ze=-+bexh20arx~W*-YwrG0)6kc2bxEhXuPN7<F27Dr
zs)xp2*-NSyiG$R=x~(2jDxcjkgB@j0%gTLzxcD-;;&Gu|Vq-93E;LJ@)*gs-Vx6VC
z)l%#L&K4OKXA_M>5zRf!3fRc)wy-Uw#!JY<9-<w?MO#l#B-}-7H4q9$c-r>=H+_jM
zTdla_I!~uotVZ~lpq<v9AU<rLsvbpZvzY4A5qsHpCV;oZ>t`-rc(vc++c4+2j2}&?
zv!Yhlv<V(2yD2HVxTRLP&jYPL7>Zb-3|6^?Z+gF_=VL^(ICDd3N`7Z@x27D-5Zb3A
z=7w_K!s`xGWVVJ>m$yFi?)SAK+zE5SZWn=6E%7p}tmJgUBzE$XxL#|Hr18nsXfgwh
zNOE^c-jbnYW8cc+#8YI9E*UG{AbQ1lOO}c?Teeo_mFvFw>HNpX?|SG@I2_aT#1~fw
zcgXpRYio4nLL7RQ^DtqOm8~e~=eW%NLT_5Ruso$_C2|v;y)-q4A}x$$pxUmIKR}$9
zDxE1b`2@cwc!f0ln&36Q%Wo6B1I2hN!8<vTz67uHjUG$zNtExkd8U+#f&?$q%}wwc
zU%w~8J8s5jFI;xlohj^xy!nF|Km=g~V4?(FXlD;^oIbQ6h!FLD(l-8;e;h5VvQqkV
zQWv0i3;o)$14qaO(Mw*WbwpwG(4&i%CLcioc9A}SwZ7(UzBg_6@nx5A`?2po{BFPV
z-x;jEr<A#L<0<BKqc)T8UUJ&Q45iK%o@@O~jx<c)6Vx}cYLglD@(fWXHJZq?Iu&8`
z9?qwbUyyf1tX?#-@*sQAg%0``SUy2oRNzrmp^{T5WYo3&Y^A02xCh%gO>4#9k^enw
F*FT?KLd*aF

literal 0
HcmV?d00001

diff --git a/test/api/meson.build b/test/api/meson.build
index cba80f018..7ea295420 100644
--- a/test/api/meson.build
+++ b/test/api/meson.build
@@ -14,6 +14,7 @@ tests = [
   'test-common.c',
   'test-draw.c',
   'test-font.c',
+  'test-font-scale.c',
   'test-map.c',
   'test-object.c',
   'test-ot-alternates.c',
diff --git a/test/api/test-font-scale.c b/test/api/test-font-scale.c
new file mode 100644
index 000000000..6949e70ac
--- /dev/null
+++ b/test/api/test-font-scale.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2021 Red Hat, 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.
+ *
+ * Author(s): Matthias Clasen
+ */
+
+#include "hb-test.h"
+
+#include <hb.h>
+
+/* test for https://github.com/harfbuzz/harfbuzz/issues/3274 */
+
+static void
+test_hb_scale (void)
+{
+  hb_face_t *face = hb_test_open_font_file ("fonts/Cantarell.A.otf");
+  hb_font_t *font1 = hb_font_create (face);
+  hb_font_t *font2 = hb_font_create (face);
+
+  double scale = 64 * 1024 * 96./72.;
+  hb_font_set_scale (font1, scale, scale);
+  hb_font_set_scale (font2, - scale, - scale);
+
+  g_assert_cmpint (hb_font_get_glyph_h_advance (font1, 1), ==, - hb_font_get_glyph_h_advance (font2, 1));
+
+  hb_font_destroy (font1);
+  hb_font_destroy (font2);
+  hb_face_destroy (face);
+}
+
+int
+main (int argc, char **argv)
+{
+  hb_test_init (&argc, &argv);
+  hb_test_add (test_hb_scale);
+  return hb_test_run ();
+}