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GtkTextView: Fix regression in GtkSourceView drawing

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GtkSourceView draws before chaining upo to GtkTextView and assumes
that this will be visible, but the pixelcache will just overdraw
that with background.

So, we stop drawing the background to the pixel cache and instead
make it an CAIRO_CONTENT_COLOR_ALPHA surface to make the previously
drawn content see through.

This is slower, but more backwards compatible.

https://bugzilla.gnome.org/show_bug.cgi?id=708423
This commit is contained in:
Alexander Larsson 2013-10-02 15:14:56 +02:00
parent 190bdf0592
commit 9f04e9ccb1
1 changed files with 7 additions and 12 deletions
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19
gtk/gtktextview.c
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@ -1474,6 +1474,13 @@ gtk_text_view_init (GtkTextView *text_view)
priv->pixel_cache = _gtk_pixel_cache_new ();
/* Widgets inheriting from GtkTextView (like GtkSourceView) rely on being able to
paint before chaining up to GtkTextView.draw() and having that be visible, that
doesn't work unless we have alpha in the textview pixelcache. This is slightly
suboptimal, as it means drawing the cache is slower (and OVER operation) rather
than a pure blit, but is required for backwards compat. */
_gtk_pixel_cache_set_content (priv->pixel_cache, CAIRO_CONTENT_COLOR_ALPHA);
/* Set up default style */
priv->wrap_mode = GTK_WRAP_NONE;
priv->pixels_above_lines = 0;
@ -5243,18 +5250,6 @@ draw_text (cairo_t *cr,
gpointer user_data)
{
GtkWidget *widget = user_data;
GtkStyleContext *context;
GdkRectangle bg_rect;
gdk_cairo_get_clip_rectangle (cr, &bg_rect);
context = gtk_widget_get_style_context (widget);
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);
gtk_render_background (context, cr,
bg_rect.x, bg_rect.y,
bg_rect.width, bg_rect.height);
gtk_style_context_restore (context);
gtk_text_view_paint (widget, cr);
}