[librsvg/librsvg-2.40] Use a hard-coded font file to render test images, for predictable font rendering

From: Federico Mena Quintero <federico src gnome org>
To: commits-list gnome org
Cc:
Subject: [librsvg/librsvg-2.40] Use a hard-coded font file to render test images, for predictable font rendering
Date: Wed, 4 Oct 2017 13:01:44 +0000 (UTC)
commit c92772d25005f15f8e95418138959109baa0f5b3
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Jan 4 15:00:00 2017 -0600

    Use a hard-coded font file to render test images, for predictable font rendering
    
    If we depend on whatever Fontconfig finds on the system (or the user's
    configuration, or any number of variables not under our control), "make
    distcheck" will certainly fail.
    
    Now we ship a specific font file (LiberationSans-Regular.ttf) that is
    used only for the reftests.  We use that in addition to explicitly
    setting font rendering options for tests.
    
    Also, re-normalize all the reference images to this new font.
    
    Thanks to Vlad Vukicevic for the idea to use a hard-coded font file, and
    to Christian Hergert for the Fontconfig / Pango incantations.

 Makefile.am                                        |    1 +
 rsvg-cairo-draw.c                                  |   37 ++++++++++++++-
 rsvg-cairo-render.c                                |    6 +++
 rsvg-cairo-render.h                                |    3 +
 tests/Makefile.am                                  |   47 ++++++++++---------
 tests/fixtures/reftests/bugs/749415-ref.png        |  Bin 21402 -> 21862 bytes
 .../reftests/svg1.1/filters-color-02-b-ref.png     |  Bin 0 -> 6231 bytes
 .../reftests/svg1.1/filters-composite-02-b-ref.png |  Bin 0 -> 16647 bytes
 .../reftests/svg1.1/painting-marker-01-f-ref.png   |  Bin 0 -> 8454 bytes
 .../reftests/svg1.1/painting-marker-02-f-ref.png   |  Bin 0 -> 9172 bytes
 .../reftests/svg1.1/painting-marker-03-f-ref.png   |  Bin 0 -> 29006 bytes
 .../reftests/svg1.1/painting-marker-04-f-ref.png   |  Bin 0 -> 27598 bytes
 .../reftests/svg1.1/painting-marker-06-f-ref.png   |  Bin 0 -> 8640 bytes
 .../reftests/svg1.1/painting-marker-07-f-ref.png   |  Bin 0 -> 5158 bytes
 .../svg1.1/painting-marker-properties-01-f-ref.png |  Bin 0 -> 6175 bytes
 .../reftests/svg1.1/paths-data-01-t-ref.png        |  Bin 0 -> 25436 bytes
 .../reftests/svg1.1/paths-data-02-t-ref.png        |  Bin 0 -> 32917 bytes
 .../reftests/svg1.1/paths-data-03-f-ref.png        |  Bin 0 -> 30956 bytes
 .../reftests/svg1.1/paths-data-04-t-ref.png        |  Bin 0 -> 18160 bytes
 .../reftests/svg1.1/paths-data-05-t-ref.png        |  Bin 0 -> 16048 bytes
 .../reftests/svg1.1/paths-data-06-t-ref.png        |  Bin 0 -> 7255 bytes
 .../reftests/svg1.1/paths-data-07-t-ref.png        |  Bin 0 -> 6646 bytes
 .../reftests/svg1.1/paths-data-08-t-ref.png        |  Bin 0 -> 19314 bytes
 .../reftests/svg1.1/paths-data-09-t-ref.png        |  Bin 0 -> 17595 bytes
 .../reftests/svg1.1/paths-data-10-t-ref.png        |  Bin 0 -> 20995 bytes
 .../reftests/svg1.1/paths-data-12-t-ref.png        |  Bin 0 -> 9704 bytes
 .../reftests/svg1.1/paths-data-13-t-ref.png        |  Bin 0 -> 4526 bytes
 .../reftests/svg1.1/paths-data-14-t-ref.png        |  Bin 0 -> 12525 bytes
 .../reftests/svg1.1/paths-data-15-t-ref.png        |  Bin 0 -> 6001 bytes
 .../reftests/svg1.1/paths-data-16-t-ref.png        |  Bin 0 -> 7879 bytes
 .../reftests/svg1.1/paths-data-17-f-ref.png        |  Bin 0 -> 4464 bytes
 .../reftests/svg1.1/paths-data-18-f-ref.png        |  Bin 0 -> 4781 bytes
 .../reftests/svg1.1/paths-data-19-f-ref.png        |  Bin 0 -> 23515 bytes
 .../reftests/svg1.1/paths-data-20-f-ref.png        |  Bin 0 -> 9144 bytes
 .../reftests/svg1.1/pservers-grad-01-b-ref.png     |  Bin 0 -> 9758 bytes
 .../reftests/svg1.1/pservers-grad-02-b-ref.png     |  Bin 0 -> 22622 bytes
 .../reftests/svg1.1/pservers-grad-03-b-ref.png     |  Bin 0 -> 9805 bytes
 .../reftests/svg1.1/pservers-grad-04-b-ref.png     |  Bin 0 -> 24018 bytes
 .../reftests/svg1.1/pservers-grad-05-b-ref.png     |  Bin 0 -> 65037 bytes
 .../reftests/svg1.1/pservers-grad-06-b-ref.png     |  Bin 0 -> 21260 bytes
 .../reftests/svg1.1/pservers-grad-07-b-ref.png     |  Bin 0 -> 11051 bytes
 .../reftests/svg1.1/pservers-grad-08-b-ref.png     |  Bin 0 -> 38874 bytes
 .../reftests/svg1.1/pservers-grad-09-b-ref.png     |  Bin 0 -> 6207 bytes
 .../reftests/svg1.1/pservers-grad-10-b-ref.png     |  Bin 0 -> 9229 bytes
 .../reftests/svg1.1/pservers-grad-11-b-ref.png     |  Bin 0 -> 56357 bytes
 .../reftests/svg1.1/pservers-grad-12-b-ref.png     |  Bin 0 -> 23747 bytes
 .../reftests/svg1.1/pservers-grad-13-b-ref.png     |  Bin 0 -> 93434 bytes
 .../reftests/svg1.1/pservers-grad-14-b-ref.png     |  Bin 0 -> 24537 bytes
 .../reftests/svg1.1/pservers-grad-15-b-ref.png     |  Bin 0 -> 10180 bytes
 .../reftests/svg1.1/pservers-grad-16-b-ref.png     |  Bin 0 -> 4738 bytes
 .../reftests/svg1.1/pservers-grad-18-b-ref.png     |  Bin 0 -> 4733 bytes
 .../reftests/svg1.1/pservers-grad-21-b-ref.png     |  Bin 0 -> 11549 bytes
 .../reftests/svg1.1/pservers-grad-22-b-ref.png     |  Bin 0 -> 7605 bytes
 .../reftests/svg1.1/pservers-grad-23-f-ref.png     |  Bin 0 -> 6129 bytes
 .../reftests/svg1.1/pservers-grad-24-f-ref.png     |  Bin 0 -> 7313 bytes
 .../svg1.1/pservers-grad-stops-01-f-ref.png        |  Bin 0 -> 6356 bytes
 tests/resources/LiberationSans-Regular.ttf         |  Bin 0 -> 139764 bytes
 57 files changed, 69 insertions(+), 25 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 6206c59..f89d7ba 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -77,6 +77,7 @@ librsvg_@RSVG_API_MAJOR_VERSION@_la_CPPFLAGS = \
        -I$(top_builddir)                       \
        -DG_LOG_DOMAIN=\"librsvg\"              \
        -DLIBRSVG_DATADIR="\"$(datadir)\""      \
+       -DSRCDIR=\""${abs_top_srcdir}"\"        \
        -DRSVG_DISABLE_DEPRECATION_WARNINGS     \
        $(AM_CPPFLAGS)
 
diff --git a/rsvg-cairo-draw.c b/rsvg-cairo-draw.c
index c139ebe..6c6df1c 100644
--- a/rsvg-cairo-draw.c
+++ b/rsvg-cairo-draw.c
@@ -41,8 +41,6 @@
 
 #include <pango/pangocairo.h>
 
-static const cairo_user_data_key_t surface_pixel_data_key;
-
 static void
 _pattern_add_rsvg_color_stops (cairo_pattern_t * pattern,
                                GPtrArray * stops, guint32 current_color_rgb, guint8 opacity)
@@ -389,6 +387,34 @@ set_font_options_for_testing (PangoContext *context)
     cairo_font_options_destroy (font_options);
 }
 
+static void
+create_font_config_for_testing (RsvgCairoRender *render)
+{
+    const char *font_path = SRCDIR "/tests/resources/LiberationSans-Regular.ttf";
+
+    if (render->font_config_for_testing != NULL)
+        return;
+
+    render->font_config_for_testing = FcConfigCreate ();
+
+    if (!FcConfigAppFontAddFile (render->font_config_for_testing, (const FcChar8 *) font_path)) {
+        g_error ("Could not load font file \"%s\" for tests; aborting", font_path);
+    }
+}
+
+static PangoFontMap *
+get_font_map_for_testing (RsvgCairoRender *render)
+{
+    PangoFontMap *font_map;
+
+    create_font_config_for_testing (render);
+
+    font_map = pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT);
+    pango_fc_font_map_set_config (PANGO_FC_FONT_MAP (font_map), render->font_config_for_testing);
+
+    return font_map;
+}
+
 PangoContext *
 rsvg_cairo_create_pango_context (RsvgDrawingCtx * ctx)
 {
@@ -396,7 +422,12 @@ rsvg_cairo_create_pango_context (RsvgDrawingCtx * ctx)
     PangoContext *context;
     RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
 
-    fontmap = pango_cairo_font_map_get_default ();
+    if (ctx->is_testing) {
+        fontmap = get_font_map_for_testing (render);
+    } else {
+        fontmap = pango_cairo_font_map_get_default ();
+    }
+
     context = pango_font_map_create_context (fontmap);
     pango_cairo_update_context (render->cr, context);
 
diff --git a/rsvg-cairo-render.c b/rsvg-cairo-render.c
index 46dfd74..546336b 100644
--- a/rsvg-cairo-render.c
+++ b/rsvg-cairo-render.c
@@ -46,6 +46,11 @@ rsvg_cairo_render_free (RsvgRender * self)
 
     /* TODO */
 
+    if (me->font_config_for_testing) {
+        FcConfigDestroy (me->font_config_for_testing);
+        me->font_config_for_testing = NULL;
+    }
+
     g_free (me);
 }
 
@@ -73,6 +78,7 @@ rsvg_cairo_render_new (cairo_t * cr, double width, double height)
     cairo_render->cr_stack = NULL;
     cairo_render->bb_stack = NULL;
     cairo_render->surfaces_stack = NULL;
+    cairo_render->font_config_for_testing = NULL;
 
     return cairo_render;
 }
diff --git a/rsvg-cairo-render.h b/rsvg-cairo-render.h
index 75e8489..d3bd6a7 100644
--- a/rsvg-cairo-render.h
+++ b/rsvg-cairo-render.h
@@ -30,6 +30,7 @@
 
 #include "rsvg-private.h"
 #include <cairo.h>
+#include <pango/pangofc-fontmap.h>
 
 G_BEGIN_DECLS typedef struct _RsvgCairoRender RsvgCairoRender;
 
@@ -48,6 +49,8 @@ struct _RsvgCairoRender {
     RsvgBbox bbox;
     GList *bb_stack;
     GList *surfaces_stack;
+
+    FcConfig *font_config_for_testing;
 };
 
 #define RSVG_CAIRO_RENDER(render) (_RSVG_RENDER_CIC ((render), RSVG_RENDER_TYPE_CAIRO, RsvgCairoRender))
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 7aab233..297ce57 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -44,27 +44,30 @@ INCLUDES = -I$(srcdir)                                                      \
           -DTOP_SRC_DIR="\"$(top_srcdir)\""                            \
          $(LIBRSVG_CFLAGS)
 
-dist_installed_test_data =                             \
-       $(wildcard $(srcdir)/fixtures/crash/*.svg)      \
-       $(wildcard $(srcdir)/fixtures/crash/*.png)      \
+dist_installed_test_data =                                     \
+       $(wildcard $(srcdir)/resources/*)                       \
+       $(wildcard $(srcdir)/fixtures/crash/*.svg)              \
+       $(wildcard $(srcdir)/fixtures/crash/*.png)              \
        $(wildcard $(srcdir)/fixtures/loading/*)        \
-       $(wildcard $(srcdir)/fixtures/reftests/*.svg)   \
-       $(wildcard $(srcdir)/fixtures/reftests/*.png)   \
-       $(wildcard $(srcdir)/fixtures/reftests/bugs*.svg)       \
-       $(wildcard $(srcdir)/fixtures/reftests/bugs*.png)       \
-       fixtures/dimensions/bug564527.svg               \
-       fixtures/dimensions/bug614018.svg               \
-       fixtures/dimensions/bug612951.svg               \
-       fixtures/dimensions/bug608102.svg               \
-       fixtures/dimensions/sub-rect-no-unit.svg        \
-       fixtures/styles/bug620693.svg                   \
-       fixtures/styles/bug614704.svg                   \
-       fixtures/styles/bug614606.svg                   \
-       fixtures/styles/important.svg                   \
-       fixtures/styles/svg-class.svg                   \
-       fixtures/styles/bug592207.svg                   \
-       fixtures/styles/bug338160.svg                   \
-       fixtures/styles/bug379629.svg                   \
-       fixtures/styles/bug614643.svg                   \
-       fixtures/styles/bug418823.svg                   \
+       $(wildcard $(srcdir)/fixtures/reftests/*.svg)           \
+       $(wildcard $(srcdir)/fixtures/reftests/*.png)           \
+       $(wildcard $(srcdir)/fixtures/reftests/bugs/*.svg)      \
+       $(wildcard $(srcdir)/fixtures/reftests/bugs/*.png)      \
+       $(wildcard $(srcdir)/fixtures/reftests/svg1.1/*.svg)    \
+       $(wildcard $(srcdir)/fixtures/reftests/svg1.1/*.png)    \
+       fixtures/dimensions/bug564527.svg                       \
+       fixtures/dimensions/bug614018.svg                       \
+       fixtures/dimensions/bug612951.svg                       \
+       fixtures/dimensions/bug608102.svg                       \
+       fixtures/dimensions/sub-rect-no-unit.svg                \
+       fixtures/styles/bug620693.svg                           \
+       fixtures/styles/bug614704.svg                           \
+       fixtures/styles/bug614606.svg                           \
+       fixtures/styles/important.svg                           \
+       fixtures/styles/svg-class.svg                           \
+       fixtures/styles/bug592207.svg                           \
+       fixtures/styles/bug338160.svg                           \
+       fixtures/styles/bug379629.svg                           \
+       fixtures/styles/bug614643.svg                           \
+       fixtures/styles/bug418823.svg                           \
        fixtures/styles/order.svg
diff --git a/tests/fixtures/reftests/bugs/749415-ref.png b/tests/fixtures/reftests/bugs/749415-ref.png
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