[evince] Fix scaling calculation in ev-spectre.c

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 6b36108db2906743ec7e5b3ead2a88168c14d56a
Author: Jason Crain <jason aquaticape us>
Date:   Thu Aug 4 10:59:29 2016 -0500

    Fix scaling calculation in ev-spectre.c
    
    Since the change to specify rendering output in pixels instead of a
    scale, the scaling passed to spectre_render_context_set_scale has the
    width and height swapped for rotated documents.  This fixes the scaling
    calculation.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755776

 backend/ps/ev-spectre.c |   26 +++++++++++++-------------
 1 files changed, 13 insertions(+), 13 deletions(-)
---
diff --git a/backend/ps/ev-spectre.c b/backend/ps/ev-spectre.c
index 265fed3..8657e31 100644
--- a/backend/ps/ev-spectre.c
+++ b/backend/ps/ev-spectre.c
@@ -299,15 +299,23 @@ ps_document_render (EvDocument      *document,
        
        spectre_page_get_size (ps_page, &width_points, &height_points);
 
-       ev_render_context_compute_scaled_size (rc, width_points, height_points,
-                                              &width, &height);
+       ev_render_context_compute_transformed_size (rc, width_points, height_points,
+                                                   &width, &height);
 
        rotation = (rc->rotation + get_page_rotation (ps_page)) % 360;
 
+       if (rotation == 90 || rotation == 270) {
+               swidth = height;
+               sheight = width;
+       } else {
+               swidth = width;
+               sheight = height;
+       }
+
        src = spectre_render_context_new ();
        spectre_render_context_set_scale (src,
-                                         (gdouble)width / width_points,
-                                         (gdouble)height / height_points);
+                                         (gdouble)swidth / width_points,
+                                         (gdouble)sheight / height_points);
        spectre_render_context_set_rotation (src, rotation);
        spectre_page_render (ps_page, src, &data, &stride);
        spectre_render_context_free (src);
@@ -323,17 +331,9 @@ ps_document_render (EvDocument      *document,
                return NULL;
        }
 
-       if (rotation == 90 || rotation == 270) {
-               swidth = height;
-               sheight = width;
-       } else {
-               swidth = width;
-               sheight = height;
-       }
-       
        surface = cairo_image_surface_create_for_data (data,
                                                       CAIRO_FORMAT_RGB24,
-                                                      swidth, sheight,
+                                                      width, height,
                                                       stride);
        cairo_surface_set_user_data (surface, &key,
                                     data, (cairo_destroy_func_t)g_free);