[evince] pdf: support for adding and saving highlight annotations

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 673ccf39ec859951b768820d60cc81f35ecd5e18
Author: Giselle Reis <gisellemnr src gnome org>
Date:   Thu Aug 7 17:19:09 2014 +0200

    pdf: support for adding and saving highlight annotations
    
    Creates a poppler highlight annotation from evince's
    highlight annotation and add support for updating the region covered by
    text markup annotations in poppler.

 backend/pdf/ev-poppler.cc |  112 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 111 insertions(+), 1 deletions(-)
---
diff --git a/backend/pdf/ev-poppler.cc b/backend/pdf/ev-poppler.cc
index b1bee58..6f8ab6d 100644
--- a/backend/pdf/ev-poppler.cc
+++ b/backend/pdf/ev-poppler.cc
@@ -3194,6 +3194,73 @@ pdf_document_annotations_remove_annotation (EvDocumentAnnotations *document_anno
         pdf_document->annots_modified = TRUE;
 }
 
+/* FIXME: this could be moved to poppler */
+static GArray *
+get_quads_for_area (PopplerPage      *page,
+                   EvRectangle      *area,
+                   PopplerRectangle *bbox)
+{
+       GList  *rects, *l;
+       guint   n_rects;
+       guint   i;
+       GArray *quads;
+       gdouble height;
+       gdouble max_x, max_y, min_x, min_y;
+
+       if (bbox) {
+               bbox->x1 = G_MAXDOUBLE;
+               bbox->y1 = G_MAXDOUBLE;
+               bbox->x2 = G_MINDOUBLE;
+               bbox->y2 = G_MINDOUBLE;
+       }
+
+       poppler_page_get_size (page, NULL, &height);
+
+       rects = poppler_page_get_selection_region (page, 1.0, POPPLER_SELECTION_GLYPH,
+                                                  (PopplerRectangle *)area);
+       n_rects = g_list_length (rects);
+
+       quads = g_array_sized_new (TRUE, TRUE,
+                                  sizeof (PopplerQuadrilateral),
+                                  n_rects);
+       g_array_set_size (quads, n_rects);
+
+       for (l = rects, i = 0; i < n_rects; i++, l = l->next) {
+               PopplerRectangle     *r = (PopplerRectangle *) l->data;
+               PopplerQuadrilateral *quad = &g_array_index (quads, PopplerQuadrilateral, i);
+
+               quad->p1.x = r->x1;
+               quad->p1.y = height - r->y2;
+               quad->p2.x = r->x2;
+               quad->p2.y = height - r->y2;
+               quad->p3.x = r->x1;
+               quad->p3.y = height - r->y1;
+               quad->p4.x = r->x2;
+               quad->p4.y = height - r->y1;
+               poppler_rectangle_free (r);
+
+               if (!bbox)
+                       continue;
+
+               max_x = MAX (quad->p1.x, MAX (quad->p2.x, MAX (quad->p3.x, quad->p4.x)));
+               max_y = MAX (quad->p1.y, MAX (quad->p2.y, MAX (quad->p3.y, quad->p4.y)));
+               min_x = MIN (quad->p1.x, MIN (quad->p2.x, MIN (quad->p3.x, quad->p4.x)));
+               min_y = MIN (quad->p1.y, MIN (quad->p2.y, MIN (quad->p3.y, quad->p4.y)));
+
+               if (min_x < bbox->x1)
+                       bbox->x1 = min_x;
+               if (min_y < bbox->y1)
+                       bbox->y1 = min_y;
+               if (max_x > bbox->x2)
+                       bbox->x2 = max_x;
+               if (max_y > bbox->y2)
+                       bbox->y2 = max_y;
+       }
+       g_list_free (rects);
+
+       return quads;
+}
+
 static void
 pdf_document_annotations_add_annotation (EvDocumentAnnotations *document_annotations,
                                         EvAnnotation          *annot,
@@ -3236,6 +3303,21 @@ pdf_document_annotations_add_annotation (EvDocumentAnnotations *document_annotat
                                                     get_poppler_annot_text_icon (icon));
                        }
                        break;
+               case EV_ANNOTATION_TYPE_TEXT_MARKUP: {
+                       GArray *quads;
+
+                       quads = get_quads_for_area (poppler_page, &rect, NULL);
+
+                       switch (ev_annotation_text_markup_get_markup_type (EV_ANNOTATION_TEXT_MARKUP 
(annot))) {
+                               case EV_ANNOTATION_TEXT_MARKUP_HIGHLIGHT:
+                                       poppler_annot = poppler_annot_text_markup_new_highlight 
(pdf_document->document, &poppler_rect, quads);
+                                       break;
+                               default:
+                                       g_assert_not_reached ();
+                       }
+                       g_array_unref (quads);
+               }
+                       break;
                default:
                        g_assert_not_reached ();
        }
@@ -3375,7 +3457,7 @@ pdf_document_annotations_save_annotation (EvDocumentAnnotations *document_annota
                poppler_annot_set_color (poppler_annot, &color);
        }
 
-       if (mask & EV_ANNOTATIONS_SAVE_AREA) {
+       if (mask & EV_ANNOTATIONS_SAVE_AREA && !EV_IS_ANNOTATION_TEXT_MARKUP (annot)) {
                EvRectangle      area;
                PopplerRectangle poppler_rect;
                EvPage          *page;
@@ -3489,6 +3571,34 @@ pdf_document_annotations_save_annotation (EvDocumentAnnotations *document_annota
                                                new_annot,
                                                (GDestroyNotify) g_object_unref);
                }
+
+               if (mask & EV_ANNOTATIONS_SAVE_AREA) {
+                       EvRectangle       area;
+                       GArray           *quads;
+                       PopplerRectangle  bbox;
+                       EvPage           *page;
+                       PopplerPage      *poppler_page;
+
+                       page = ev_annotation_get_page (annot);
+                       poppler_page = POPPLER_PAGE (page->backend_page);
+
+                       ev_annotation_get_area (annot, &area);
+                       quads = get_quads_for_area (poppler_page, &area, &bbox);
+                       if (quads->len > 0) {
+                               gdouble height;
+
+                               poppler_annot_text_markup_set_quadrilaterals (text_markup, quads);
+                               poppler_annot_set_rectangle (poppler_annot, &bbox);
+
+                               poppler_page_get_size (poppler_page, NULL, &height);
+                               area.x1 = bbox.x1;
+                               area.x2 = bbox.x2;
+                               area.y1 = height - bbox.y2;
+                               area.y2 = height - bbox.y1;
+                               ev_annotation_set_area (annot, &area);
+                       }
+                       g_array_unref (quads);
+               }
        }
 
        PDF_DOCUMENT (document_annotations)->annots_modified = TRUE;