[gtksourceview/wip/chergert/gsv-gtk4: 106/172] view: port to GtkWidgetClass.snapshot

[Christian Hergert <chergert src gnome org>]

commit df26f379503728af0b25568edebc79cbb934bcd0
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jan 15 15:41:51 2020 -0800

    view: port to GtkWidgetClass.snapshot
    
    We no longer use cairo for drawing the textview (unless we hit a fallback
    path) so we want to use render nodes here too. This simplifies some of
    the layer drawing to use render nodes.

 gtksourceview/gtksourceview.c | 125 ++++++++++++++----------------------------
 1 file changed, 40 insertions(+), 85 deletions(-)
---
diff --git a/gtksourceview/gtksourceview.c b/gtksourceview/gtksourceview.c
index b4ef6a7d..3a8e6b2f 100644
--- a/gtksourceview/gtksourceview.c
+++ b/gtksourceview/gtksourceview.c
@@ -275,8 +275,6 @@ static void           gtk_source_view_get_lines            (GtkTextView
                                                             GArray                  *line_heights,
                                                             GArray                  *numbers,
                                                             gint                    *countp);
-static gboolean       gtk_source_view_draw                 (GtkWidget               *widget,
-                                                            cairo_t                 *cr);
 static void           gtk_source_view_move_lines           (GtkSourceView           *view,
                                                             gboolean                 down);
 static void           gtk_source_view_move_words           (GtkSourceView           *view,
@@ -537,6 +535,7 @@ gtk_source_view_class_init (GtkSourceViewClass *klass)
                                                               FALSE,
                                                               G_PARAM_READWRITE |
                                                               G_PARAM_STATIC_STRINGS));
+
        /**
         * GtkSourceView:show-line-marks:
         *
@@ -1577,6 +1576,7 @@ remove_source_buffer (GtkSourceView *view)
                g_signal_handlers_disconnect_by_func (priv->source_buffer,
                                                      buffer_has_selection_changed_cb,
                                                      view);
+
                g_signal_handlers_disconnect_by_func (priv->source_buffer,
                                                      implicit_trailing_newline_changed_cb,
                                                      view);
@@ -2471,16 +2471,18 @@ realign (gint  offset,
 
 static void
 gtk_source_view_paint_background_pattern_grid (GtkSourceView *view,
-                                               cairo_t       *cr)
+                                               GtkSnapshot   *snapshot)
 {
        GtkSourceViewPrivate *priv = gtk_source_view_get_instance_private (view);
-       GdkRectangle clip;
+       GdkRectangle visible_rect;
        gint x, y, x2, y2;
        PangoContext *context;
        PangoLayout *layout;
        gint grid_width = 16;
        gint grid_height = 16;
 
+       gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (view), &visible_rect);
+
        context = gtk_widget_get_pango_context (GTK_WIDGET (view));
        layout = pango_layout_new (context);
        pango_layout_set_text (layout, "X", 1);
@@ -2491,38 +2493,27 @@ gtk_source_view_paint_background_pattern_grid (GtkSourceView *view,
        grid_height = MAX (1, grid_height / 2);
        grid_width = MAX (1, grid_width);
 
-       cairo_save (cr);
-
-       gdk_cairo_get_clip_rectangle (cr, &clip);
-
-       cairo_set_line_width (cr, 1.0);
-       gdk_cairo_set_source_rgba (cr, &priv->background_pattern_color);
-
        /* Align our drawing position with a multiple of the grid size. */
-       x = realign (clip.x - grid_width, grid_width);
-       y = realign (clip.y - grid_height, grid_height);
-       x2 = realign (x + clip.width + grid_width * 2, grid_width);
-       y2 = realign (y + clip.height + grid_height * 2, grid_height);
-
-       for (; x <= x2; x += grid_width)
-       {
-               cairo_move_to (cr, x + .5, clip.y - .5);
-               cairo_line_to (cr, x + .5, clip.y + clip.height - .5);
-       }
-
-       for (; y <= y2; y += grid_height)
-       {
-               cairo_move_to (cr, clip.x + .5, y - .5);
-               cairo_line_to (cr, clip.x + clip.width + .5, y - .5);
-       }
-
-       cairo_stroke (cr);
-       cairo_restore (cr);
+       x = realign (visible_rect.x - grid_width, grid_width);
+       y = realign (visible_rect.y - grid_height, grid_height);
+       x2 = realign (x + visible_rect.width + grid_width * 2, grid_width);
+       y2 = realign (y + visible_rect.height + grid_height * 2, grid_height);
+
+       gtk_snapshot_push_repeat (snapshot,
+                                 &GRAPHENE_RECT_INIT (x, y, x2 - x, y2 - y),
+                                 &GRAPHENE_RECT_INIT (x, y, grid_width, grid_height));
+       gtk_snapshot_append_color (snapshot,
+                                  &priv->background_pattern_color,
+                                  &GRAPHENE_RECT_INIT (x, y, 1, grid_height));
+       gtk_snapshot_append_color (snapshot,
+                                  &priv->background_pattern_color,
+                                  &GRAPHENE_RECT_INIT (x, y, grid_width, 1));
+       gtk_snapshot_pop (snapshot);
 }
 
 static void
 gtk_source_view_paint_current_line_highlight (GtkSourceView *view,
-                                              cairo_t       *cr)
+                                              GtkSnapshot   *snapshot)
 {
        GtkSourceViewPrivate *priv = gtk_source_view_get_instance_private (view);
        GtkTextBuffer *buffer;
@@ -2537,101 +2528,65 @@ gtk_source_view_paint_current_line_highlight (GtkSourceView *view,
        gtk_text_view_get_line_yrange (GTK_TEXT_VIEW (view), &cur, &y, &height);
 
        gtk_source_view_paint_line_background (GTK_TEXT_VIEW (view),
-                                              cr,
+                                              snapshot,
                                               y, height,
                                               &priv->current_line_color);
 }
 
 static void
-gtk_source_view_draw_layer (GtkTextView      *text_view,
-                            GtkTextViewLayer  layer,
-                            cairo_t          *cr)
+gtk_source_view_snapshot_layer (GtkTextView      *text_view,
+                                GtkTextViewLayer  layer,
+                                GtkSnapshot      *snapshot)
 {
        GtkSourceView *view = GTK_SOURCE_VIEW (text_view);
        GtkSourceViewPrivate *priv = gtk_source_view_get_instance_private (view);
 
-       cairo_save (cr);
+       gtk_snapshot_save (snapshot);
 
        if (layer == GTK_TEXT_VIEW_LAYER_BELOW_TEXT)
        {
-               gtk_source_view_ensure_redrawn_rect_is_highlighted (view, cr);
-
                if (priv->background_pattern == GTK_SOURCE_BACKGROUND_PATTERN_TYPE_GRID &&
                    priv->background_pattern_color_set)
                {
-                       gtk_source_view_paint_background_pattern_grid (view, cr);
+                       gtk_source_view_paint_background_pattern_grid (view, snapshot);
                }
 
                if (gtk_widget_is_sensitive (GTK_WIDGET (view)) &&
                    priv->highlight_current_line &&
                    priv->current_line_color_set)
                {
-                       gtk_source_view_paint_current_line_highlight (view, cr);
+                       gtk_source_view_paint_current_line_highlight (view, snapshot);
                }
 
-               gtk_source_view_paint_marks_background (view, cr);
+               gtk_source_view_paint_marks_background (view, snapshot);
        }
        else if (layer == GTK_TEXT_VIEW_LAYER_ABOVE_TEXT)
        {
                /* Draw the right margin vertical line + overlay. */
                if (priv->show_right_margin)
                {
-                       gtk_source_view_paint_right_margin (view, cr);
+                       gtk_source_view_paint_right_margin (view, snapshot);
                }
 
                if (priv->space_drawer != NULL)
                {
-                       _gtk_source_space_drawer_draw (priv->space_drawer, view, cr);
+                       _gtk_source_space_drawer_draw (priv->space_drawer, view, snapshot);
                }
        }
 
-       cairo_restore (cr);
+       gtk_snapshot_restore (snapshot);
 }
 
-static gboolean
-gtk_source_view_draw (GtkWidget *widget,
-                      cairo_t   *cr)
+static void
+gtk_source_view_snapshot (GtkWidget   *widget,
+                          GtkSnapshot *snapshot)
 {
-       GtkSourceView *view = GTK_SOURCE_VIEW (widget);
-       GtkSourceViewPrivate *priv = gtk_source_view_get_instance_private (view);
-       gboolean event_handled;
-
-#ifdef ENABLE_PROFILE
-       static GTimer *timer = NULL;
-       if (timer == NULL)
-       {
-               timer = g_timer_new ();
-       }
-
-       g_timer_start (timer);
-#endif
-
-       DEBUG ({
-               g_print ("> gtk_source_view_draw start\n");
-       });
-
-       event_handled = GTK_WIDGET_CLASS (gtk_source_view_parent_class)->draw (widget, cr);
-
-       if (priv->left_gutter != NULL)
-       {
-               _gtk_source_gutter_draw (priv->left_gutter, view, cr);
-       }
-
-       if (priv->right_gutter != NULL)
-       {
-               _gtk_source_gutter_draw (priv->right_gutter, view, cr);
-       }
+       GdkRectangle visible_rect;
 
-       PROFILE ({
-               g_timer_stop (timer);
-               g_print ("    gtk_source_view_draw time: %g (sec * 1000)\n",
-                        g_timer_elapsed (timer, NULL) * 1000);
-       });
-       DEBUG ({
-               g_print ("> gtk_source_view_draw end\n");
-       });
+       gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (widget), &visible_rect);
+       gtk_source_view_ensure_redrawn_rect_is_highlighted (GTK_SOURCE_VIEW (widget), &visible_rect);
 
-       return event_handled;
+       GTK_WIDGET_CLASS (gtk_source_view_parent_class)->snapshot (widget, snapshot);
 }
 
 /* This is a pretty important function... We call it when the tab_stop is changed,