[librsvg] 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] Use a hard-coded font file to render test images, for predictable font rendering
Date: Wed, 4 Jan 2017 21:30:21 +0000 (UTC)
commit ec3353e89a0dc0063c74c61483ed894cc96341ae
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                                  |    1 +
 tests/fixtures/reftests/bugs/340047-ref.png        |  Bin 4707 -> 4779 bytes
 tests/fixtures/reftests/bugs/749415-ref.png        |  Bin 21402 -> 21862 bytes
 tests/fixtures/reftests/bugs/760180-ref.png        |  Bin 8698 -> 8640 bytes
 .../reftests/svg1.1/filters-color-02-b-ref.png     |  Bin 6066 -> 6231 bytes
 .../reftests/svg1.1/filters-composite-02-b-ref.png |  Bin 15899 -> 16647 bytes
 .../reftests/svg1.1/painting-marker-01-f-ref.png   |  Bin 8581 -> 8454 bytes
 .../reftests/svg1.1/painting-marker-02-f-ref.png   |  Bin 9237 -> 9172 bytes
 .../reftests/svg1.1/painting-marker-03-f-ref.png   |  Bin 28067 -> 29006 bytes
 .../reftests/svg1.1/painting-marker-04-f-ref.png   |  Bin 26711 -> 27598 bytes
 .../reftests/svg1.1/painting-marker-06-f-ref.png   |  Bin 8698 -> 8640 bytes
 .../reftests/svg1.1/painting-marker-07-f-ref.png   |  Bin 5001 -> 5158 bytes
 .../svg1.1/painting-marker-properties-01-f-ref.png |  Bin 6097 -> 6175 bytes
 .../reftests/svg1.1/paths-data-01-t-ref.png        |  Bin 25377 -> 25436 bytes
 .../reftests/svg1.1/paths-data-02-t-ref.png        |  Bin 32835 -> 32917 bytes
 .../reftests/svg1.1/paths-data-03-f-ref.png        |  Bin 30742 -> 30956 bytes
 .../reftests/svg1.1/paths-data-04-t-ref.png        |  Bin 17951 -> 18160 bytes
 .../reftests/svg1.1/paths-data-05-t-ref.png        |  Bin 15946 -> 16048 bytes
 .../reftests/svg1.1/paths-data-06-t-ref.png        |  Bin 7143 -> 7255 bytes
 .../reftests/svg1.1/paths-data-07-t-ref.png        |  Bin 6473 -> 6646 bytes
 .../reftests/svg1.1/paths-data-08-t-ref.png        |  Bin 18934 -> 19314 bytes
 .../reftests/svg1.1/paths-data-09-t-ref.png        |  Bin 17284 -> 17595 bytes
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 .../reftests/svg1.1/paths-data-15-t-ref.png        |  Bin 5862 -> 6001 bytes
 .../reftests/svg1.1/paths-data-16-t-ref.png        |  Bin 7651 -> 7879 bytes
 .../reftests/svg1.1/paths-data-17-f-ref.png        |  Bin 4287 -> 4464 bytes
 .../reftests/svg1.1/paths-data-18-f-ref.png        |  Bin 4644 -> 4781 bytes
 .../reftests/svg1.1/paths-data-19-f-ref.png        |  Bin 23376 -> 23515 bytes
 .../reftests/svg1.1/paths-data-20-f-ref.png        |  Bin 8996 -> 9144 bytes
 .../reftests/svg1.1/pservers-grad-01-b-ref.png     |  Bin 9241 -> 9758 bytes
 .../reftests/svg1.1/pservers-grad-02-b-ref.png     |  Bin 22010 -> 22622 bytes
 .../reftests/svg1.1/pservers-grad-03-b-ref.png     |  Bin 9534 -> 9805 bytes
 .../reftests/svg1.1/pservers-grad-04-b-ref.png     |  Bin 23348 -> 24018 bytes
 .../reftests/svg1.1/pservers-grad-05-b-ref.png     |  Bin 63786 -> 65037 bytes
 .../reftests/svg1.1/pservers-grad-06-b-ref.png     |  Bin 20711 -> 21260 bytes
 .../reftests/svg1.1/pservers-grad-07-b-ref.png     |  Bin 10707 -> 11051 bytes
 .../reftests/svg1.1/pservers-grad-08-b-ref.png     |  Bin 37401 -> 38874 bytes
 .../reftests/svg1.1/pservers-grad-09-b-ref.png     |  Bin 5885 -> 6207 bytes
 .../reftests/svg1.1/pservers-grad-10-b-ref.png     |  Bin 8955 -> 9229 bytes
 .../reftests/svg1.1/pservers-grad-11-b-ref.png     |  Bin 56219 -> 56357 bytes
 .../reftests/svg1.1/pservers-grad-12-b-ref.png     |  Bin 23336 -> 23747 bytes
 .../reftests/svg1.1/pservers-grad-13-b-ref.png     |  Bin 93256 -> 93434 bytes
 .../reftests/svg1.1/pservers-grad-14-b-ref.png     |  Bin 24421 -> 24537 bytes
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 .../reftests/svg1.1/pservers-grad-21-b-ref.png     |  Bin 11389 -> 11549 bytes
 .../reftests/svg1.1/pservers-grad-22-b-ref.png     |  Bin 7414 -> 7605 bytes
 .../reftests/svg1.1/pservers-grad-23-f-ref.png     |  Bin 6130 -> 6129 bytes
 .../reftests/svg1.1/pservers-grad-24-f-ref.png     |  Bin 7252 -> 7313 bytes
 .../svg1.1/pservers-grad-stops-01-f-ref.png        |  Bin 6353 -> 6356 bytes
 tests/resources/LiberationSans-Regular.ttf         |  Bin 0 -> 139764 bytes
 59 files changed, 46 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 3343a19..a4b538b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -116,6 +116,7 @@ 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 dfbabc7..4fd9f36 100644
--- a/rsvg-cairo-draw.c
+++ b/rsvg-cairo-draw.c
@@ -40,7 +40,7 @@
 #include <string.h>
 
 #include <pango/pangocairo.h>
-
+#include <pango/pangofc-fontmap.h>
 static gboolean
 add_color_stop_to_gradient (RsvgNode *node, gpointer data)
 {
@@ -381,6 +381,34 @@ 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)
 {
@@ -389,7 +417,12 @@ rsvg_cairo_create_pango_context (RsvgDrawingCtx * ctx)
     RsvgCairoRender *render = RSVG_CAIRO_RENDER (ctx->render);
     double dpi_y;
 
-    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 167bf64..7eba929 100644
--- a/rsvg-cairo-render.c
+++ b/rsvg-cairo-render.c
@@ -48,6 +48,11 @@ rsvg_cairo_render_free (RsvgRender * self)
     g_assert (me->bb_stack == NULL);
     g_assert (me->surfaces_stack == NULL);
 
+    if (me->font_config_for_testing) {
+        FcConfigDestroy (me->font_config_for_testing);
+        me->font_config_for_testing = NULL;
+    }
+
     g_free (me);
 }
 
@@ -76,6 +81,7 @@ 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;
 
     cairo_matrix_init_identity (&matrix);
     rsvg_bbox_init (&cairo_render->bbox, &matrix);
diff --git a/rsvg-cairo-render.h b/rsvg-cairo-render.h
index d9bfd57..50aca51 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 e18536b..7f9b24e 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -38,6 +38,7 @@ INCLUDES = -I$(srcdir)                                                        \
          $(LIBRSVG_CFLAGS)
 
 dist_installed_test_data =                                     \
+       $(wildcard $(srcdir)/resources/*)                       \
        $(wildcard $(srcdir)/fixtures/crash/*.svg)              \
        $(wildcard $(srcdir)/fixtures/crash/*.png)              \
        $(wildcard $(srcdir)/fixtures/reftests/*.svg)           \
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