Allow linear scaling for unhinted rendering

Resolves: #1437999

freetype-2.7.1-linear-scaling.patch

@@ -0,0 +1,71 @@
+From bcc74f4dafee25ea89f1d3144646cba7e30f9908 Mon Sep 17 00:00:00 2001
+From: Werner Lemberg <wl@gnu.org>
+Date: Thu, 30 Mar 2017 13:14:43 +0200
+Subject: [truetype] Allow linear scaling for unhinted rendering (#50470).
+
+* src/truetype/ttdriver.c (tt_size_request): Revert change from
+2011-07-16; the intended metrics fix seems now to be implemented in
+a different way, making the patch unnecessary.  Note that this
+change was usually patched out by all major GNU/Linux distributions
+due to heavy side effects.
+
+* src/truetype/ttgload.c (compute_glyph_metrics, TT_Load_Glyph):
+Refer to the metrics of the `TT_Size' object.
+
+diff --git a/src/truetype/ttdriver.c b/src/truetype/ttdriver.c
+index 4ec78e2f..9bf0f84f 100644
+--- a/src/truetype/ttdriver.c
++++ b/src/truetype/ttdriver.c
+@@ -355,7 +355,6 @@
+     if ( FT_IS_SCALABLE( size->face ) )
+     {
+       error = tt_size_reset( ttsize );
+-      ttsize->root.metrics = ttsize->metrics;
+ 
+ #ifdef TT_USE_BYTECODE_INTERPRETER
+       /* for the `MPS' bytecode instruction we need the point size */
+diff --git a/src/truetype/ttgload.c b/src/truetype/ttgload.c
+index 35b62d0e..b225190a 100644
+--- a/src/truetype/ttgload.c
++++ b/src/truetype/ttgload.c
+@@ -2035,7 +2035,7 @@
+ 
+     y_scale = 0x10000L;
+     if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+-      y_scale = size->root.metrics.y_scale;
++      y_scale = size->metrics.y_scale;
+ 
+     if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
+       FT_Outline_Get_CBox( &glyph->outline, &bbox );
+@@ -2067,7 +2067,7 @@
+ 
+ 
+       widthp = tt_face_get_device_metrics( face,
+-                                           size->root.metrics.x_ppem,
++                                           size->metrics.x_ppem,
+                                            glyph_index );
+ 
+ #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
+@@ -2634,11 +2634,11 @@
+           if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance )
+             glyph->metrics.horiAdvance =
+               FT_MulFix( glyph->linearHoriAdvance,
+-                         size->root.metrics.x_scale );
++                         size->metrics.x_scale );
+           if ( !glyph->metrics.vertAdvance && glyph->linearVertAdvance )
+             glyph->metrics.vertAdvance =
+               FT_MulFix( glyph->linearVertAdvance,
+-                         size->root.metrics.y_scale );
++                         size->metrics.y_scale );
+         }
+ 
+         return FT_Err_Ok;
+@@ -2728,7 +2728,7 @@
+     /* TrueType glyphs at all sizes using the bytecode interpreter. */
+     /*                                                              */
+     if ( !( load_flags & FT_LOAD_NO_SCALE ) &&
+-         size->root.metrics.y_ppem < 24     )
++         size->metrics.y_ppem < 24          )
+       glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
+ 
+     return error;

freetype.spec

@@ -7,7 +7,7 @@
 Summary: A free and portable font rendering engine
 Name: freetype
 Version: 2.7.1
-Release: 2%{?dist}
+Release: 3%{?dist}
 License: (FTL or GPLv2+) and BSD and MIT and Public Domain and zlib with acknowledgement
 Group: System Environment/Libraries
 URL: http://www.freetype.org
@@ -31,6 +31,9 @@ Patch92:  freetype-2.5.3-freetype-config-prefix.patch
 
 Patch93:  freetype-2.6.5-libtool.patch
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=1437999
+Patch94:  freetype-2.7.1-linear-scaling.patch
+
 BuildRequires: libX11-devel
 BuildRequires: libpng-devel
 BuildRequires: zlib-devel
@@ -94,6 +97,8 @@ popd
 
 %patch93 -p1 -b .libtool
 
+%patch94 -p1 -b .linear-scaling
+
 %build
 
 %configure --disable-static \
@@ -208,6 +213,10 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/*.{a,la}
 %{_mandir}/man1/*
 
 %changelog
+* Mon Apr  3 2017 Marek Kasik <mkasik@redhat.com> - 2.7.1-3
+- Allow linear scaling for unhinted rendering
+- Resolves: #1437999
+
 * Fri Feb 10 2017 Fedora Release Engineering <releng@fedoraproject.org> - 2.7.1-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild