HiDPI: add preprocessor conditionals

config.mk

@@ -47,6 +47,15 @@ WITH_SYNCTEX ?= $(shell (${PKG_CONFIG} synctex && echo 1) || echo 0)
 # To disable support for mimetype detction with libmagic set WITH_MAGIC to 0.
 WITH_MAGIC ?= 1
 
+# HiDPI
+HIDPI_SUPPORT_CAIRO = $(shell (${PKG_CONFIG} --atleast-version=1.14 cairo && echo 1) || echo 0)
+HIDPI_SUPPORT_GTK = $(shell (${PKG_CONFIG} --atleast-version=3.10 ${GTK_PKG_CONFIG_NAME} && echo 1) || echo 0)
+ifeq (${HIDPI_SUPPORT_CAIRO},1)
+ifeq (${HIDPI_SUPPORT_GTK},1)
+CPPFLAGS += -DHAVE_HIDPI_SUPPORT
+endif
+endif
+
 # paths
 PREFIX ?= /usr
 MANPREFIX ?= ${PREFIX}/share/man

zathura/callbacks.c

@@ -223,7 +223,11 @@ cb_scale_factor(GtkWidget* widget, GParamSpec* UNUSED(pspec), zathura_t* zathura
     return;
   }
 
+#ifdef HAVE_HIDPI_SUPPORT
   int new_factor = gtk_widget_get_scale_factor(widget);
+#else
+  int new_factor = 1;
+#endif
 
   double current_x;
   double current_y;

zathura/render.c

@@ -740,6 +740,7 @@ render(render_job_t* job, ZathuraRenderRequest* request, ZathuraRenderer* render
                                                    &page_height, &page_width,
                                                    false);
 
+#ifdef HAVE_HIDPI_SUPPORT
   double device_scale_x;
   double device_scale_y;
   zathura_document_get_device_scale(document, &device_scale_x, &device_scale_y);
@@ -748,6 +749,7 @@ render(render_job_t* job, ZathuraRenderRequest* request, ZathuraRenderer* render
     page_width *= device_scale_x;
     page_height *= device_scale_y;
   }
+#endif
 
   cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
       page_width, page_height);
@@ -759,6 +761,7 @@ render(render_job_t* job, ZathuraRenderRequest* request, ZathuraRenderer* render
     return false;
   }
 
+#ifdef HAVE_HIDPI_SUPPORT
   if (device_scale_x != 0.0 && device_scale_y != 0.0) {
     cairo_surface_set_device_scale(surface, device_scale_x, device_scale_y);
     if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
@@ -766,6 +769,7 @@ render(render_job_t* job, ZathuraRenderRequest* request, ZathuraRenderer* render
       return false;
     }
   }
+#endif
 
   cairo_t* cairo = cairo_create(surface);
   if (cairo == NULL) {

zathura/zathura.c

@@ -153,8 +153,10 @@ init_ui(zathura_t* zathura)
   g_signal_connect(G_OBJECT(zathura->ui.session->gtk.view), "refresh-view",
                    G_CALLBACK(cb_refresh_view), zathura);
 
+#ifdef HAVE_HIDPI_SUPPORT
   g_signal_connect(G_OBJECT(zathura->ui.session->gtk.view),
       "notify::scale-factor", G_CALLBACK(cb_scale_factor), zathura);
+#endif
 
   /* page view */
   zathura->ui.page_widget = gtk_grid_new();