[evince/wip/gpoo/gtk4-rebase-port: 65/96] ev-view: migrate debug borders to GtkSnapshot based drawing model

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 52fd796c13283d0e95d3aa43638abb8491f6d271
Author: Qiu Wenbo <qiuwenbo kylinos com cn>
Date:   Wed Aug 18 18:22:50 2021 +0800

    ev-view: migrate debug borders to GtkSnapshot based drawing model
    
    Signed-off-by: Qiu Wenbo <qiuwenbo kylinos com cn>

 libview/ev-view.c | 93 +++++++++++++++++++++++++++----------------------------
 1 file changed, 45 insertions(+), 48 deletions(-)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 0e30b3205..b1801955a 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -4729,61 +4729,66 @@ draw_focus (EvView       *view,
 
 #ifdef EV_ENABLE_DEBUG
 static void
-stroke_view_rect (cairo_t      *cr,
+stroke_view_rect (GtkSnapshot  *snapshot,
                  GdkRectangle *clip,
+                 GdkRGBA      *color,
                  GdkRectangle *view_rect)
 {
        GdkRectangle intersect;
+       GdkRGBA border_color[4] = { *color, *color, *color, *color };
+       float border_width[4] = { 1, 1, 1, 1 };
 
        if (gdk_rectangle_intersect (view_rect, clip, &intersect)) {
-               cairo_rectangle (cr,
-                                intersect.x, intersect.y,
-                                intersect.width, intersect.height);
-               cairo_stroke (cr);
+               gtk_snapshot_append_border (snapshot,
+                       &GSK_ROUNDED_RECT_INIT (intersect.x, intersect.y,
+                                intersect.width, intersect.height),
+                       border_width, border_color);
        }
 }
 
 static void
 stroke_doc_rect (EvView       *view,
-                cairo_t      *cr,
+                GtkSnapshot  *snapshot,
+                GdkRGBA      *color,
                 gint          page,
                 GdkRectangle *clip,
                 EvRectangle  *doc_rect)
 {
        GdkRectangle view_rect;
+       GtkStyleContext *context = gtk_widget_get_style_context (GTK_WIDGET (view));
 
        _ev_view_transform_doc_rect_to_view_rect (view, page, doc_rect, &view_rect);
        view_rect.x -= view->scroll_x;
        view_rect.y -= view->scroll_y;
-       stroke_view_rect (cr, clip, &view_rect);
+       stroke_view_rect (snapshot, clip, color, &view_rect);
 }
 
 static void
 show_chars_border (EvView       *view,
-                  cairo_t      *cr,
+                  GtkSnapshot  *snapshot,
                   gint          page,
                   GdkRectangle *clip)
 {
        EvRectangle *areas = NULL;
        guint        n_areas = 0;
        guint        i;
+       GdkRGBA      color = { 1, 0, 0, 1 };
 
        ev_page_cache_get_text_layout (view->page_cache, page, &areas, &n_areas);
        if (!areas)
                return;
 
-       cairo_set_source_rgb (cr, 1., 0., 0.);
-
        for (i = 0; i < n_areas; i++) {
                EvRectangle  *doc_rect = areas + i;
 
-               stroke_doc_rect (view, cr, page, clip, doc_rect);
+               stroke_doc_rect (view, snapshot, &color, page, clip, doc_rect);
        }
 }
 
 static void
 show_mapping_list_border (EvView        *view,
-                         cairo_t       *cr,
+                         GtkSnapshot   *snapshot,
+                         GdkRGBA       *color,
                          gint           page,
                          GdkRectangle  *clip,
                          EvMappingList *mapping_list)
@@ -4793,81 +4798,80 @@ show_mapping_list_border (EvView        *view,
        for (l = ev_mapping_list_get_list (mapping_list); l; l = g_list_next (l)) {
                EvMapping *mapping = (EvMapping *)l->data;
 
-               stroke_doc_rect (view, cr, page, clip, &mapping->area);
+               stroke_doc_rect (view, snapshot, color, page, clip, &mapping->area);
        }
 }
 
 static void
 show_links_border (EvView       *view,
-                  cairo_t      *cr,
+                  GtkSnapshot  *snapshot,
                   gint          page,
                   GdkRectangle *clip)
 {
-       cairo_set_source_rgb (cr, 0., 0., 1.);
-       show_mapping_list_border (view,cr, page, clip,
+       GdkRGBA color = { 0, 0, 1, 1 };
+       show_mapping_list_border (view, snapshot, &color, page, clip,
                                  ev_page_cache_get_link_mapping (view->page_cache, page));
 }
 
 static void
 show_forms_border (EvView       *view,
-                  cairo_t      *cr,
+                  GtkSnapshot  *snapshot,
                   gint          page,
                   GdkRectangle *clip)
 {
-       cairo_set_source_rgb (cr, 0., 1., 0.);
-       show_mapping_list_border (view, cr, page, clip,
+       GdkRGBA color = { 0, 1, 0, 1 };
+       show_mapping_list_border (view, snapshot, &color, page, clip,
                                  ev_page_cache_get_form_field_mapping (view->page_cache, page));
 }
 
 static void
 show_annots_border (EvView       *view,
-                   cairo_t      *cr,
+                   GtkSnapshot  *snapshot,
                    gint          page,
                    GdkRectangle *clip)
 {
-       cairo_set_source_rgb (cr, 0., 1., 1.);
-       show_mapping_list_border (view, cr, page, clip,
+       GdkRGBA color = { 0, 1, 1, 1 };
+       show_mapping_list_border (view, snapshot, &color, page, clip,
                                  ev_page_cache_get_annot_mapping (view->page_cache, page));
 }
 
 static void
 show_images_border (EvView       *view,
-                   cairo_t      *cr,
+                   GtkSnapshot  *snapshot,
                    gint          page,
                    GdkRectangle *clip)
 {
-       cairo_set_source_rgb (cr, 1., 0., 1.);
-       show_mapping_list_border (view, cr, page, clip,
+       GdkRGBA color = { 1, 0, 1, 1 };
+       show_mapping_list_border (view, snapshot, &color, page, clip,
                                  ev_page_cache_get_image_mapping (view->page_cache, page));
 }
 
 static void
 show_media_border (EvView       *view,
-                  cairo_t      *cr,
+                  GtkSnapshot  *snapshot,
                   gint          page,
                   GdkRectangle *clip)
 {
-       cairo_set_source_rgb (cr, 1., 1., 0.);
-       show_mapping_list_border (view, cr, page, clip,
+       GdkRGBA color = { 1, 1, 0, 1 };
+       show_mapping_list_border (view, snapshot, &color, page, clip,
                                  ev_page_cache_get_media_mapping (view->page_cache, page));
 }
 
 
 static void
 show_selections_border (EvView       *view,
-                       cairo_t      *cr,
+                       GtkSnapshot  *snapshot,
                        gint          page,
                        GdkRectangle *clip)
 {
        cairo_region_t *region;
        guint           i, n_rects;
+       GdkRGBA color = { 0.75, 0.50, 0.25, 1 };
 
        region = ev_page_cache_get_text_mapping (view->page_cache, page);
        if (!region)
                return;
 
-       cairo_set_source_rgb (cr, 0.75, 0.50, 0.25);
-
        region = cairo_region_copy (region);
        n_rects = cairo_region_num_rectangles (region);
        for (i = 0; i < n_rects; i++) {
@@ -4882,38 +4886,33 @@ show_selections_border (EvView       *view,
                doc_rect_float.x2 = doc_rect_int.x + doc_rect_int.width;
                doc_rect_float.y2 = doc_rect_int.y + doc_rect_int.height;
 
-               stroke_doc_rect (view, cr, page, clip, &doc_rect_float);
+               stroke_doc_rect (view, snapshot, &color, page, clip, &doc_rect_float);
        }
        cairo_region_destroy (region);
 }
 
 static void
 draw_debug_borders (EvView       *view,
-                   cairo_t      *cr,
+                   GtkSnapshot  *snapshot,
                    gint          page,
                    GdkRectangle *clip)
 {
        EvDebugBorders borders = ev_debug_get_debug_borders();
 
-       cairo_save (cr);
-       cairo_set_line_width (cr, 0.5);
-
        if (borders & EV_DEBUG_BORDER_CHARS)
-               show_chars_border (view, cr, page, clip);
+               show_chars_border (view, snapshot, page, clip);
        if (borders & EV_DEBUG_BORDER_LINKS)
-               show_links_border (view, cr, page, clip);
+               show_links_border (view, snapshot, page, clip);
        if (borders & EV_DEBUG_BORDER_FORMS)
-               show_forms_border (view, cr, page, clip);
+               show_forms_border (view, snapshot, page, clip);
        if (borders & EV_DEBUG_BORDER_ANNOTS)
-               show_annots_border (view, cr, page, clip);
+               show_annots_border (view, snapshot, page, clip);
        if (borders & EV_DEBUG_BORDER_IMAGES)
-               show_images_border (view, cr, page, clip);
+               show_images_border (view, snapshot, page, clip);
        if (borders & EV_DEBUG_BORDER_MEDIA)
-               show_media_border (view, cr, page, clip);
+               show_media_border (view, snapshot, page, clip);
        if (borders & EV_DEBUG_BORDER_SELECTIONS)
-               show_selections_border (view, cr, page, clip);
-
-       cairo_restore (cr);
+               show_selections_border (view, snapshot, page, clip);
 }
 #endif
 
@@ -4964,11 +4963,9 @@ static void ev_view_snapshot(GtkWidget *widget, GtkSnapshot *snapshot)
                        draw_focus (view, snapshot, i, &clip_rect);
                if (page_ready && view->synctex_result)
                        highlight_forward_search_results (view, snapshot, i);
-#if 0
 #ifdef EV_ENABLE_DEBUG
                if (page_ready)
-                       draw_debug_borders (view, cr, i, &clip_rect);
-#endif
+                       draw_debug_borders (view, snapshot, i, &clip_rect);
 #endif
        }