Bug 449959: gfxGdkNativeRenderer: look for GdkDrawable on group target,

use default display for fallback. r=vlad/karlt

gfx/thebes/public/gfxGdkNativeRenderer.h

@@ -81,7 +81,7 @@ public:
         // visual passed in must be the default visual for dpy's default screen
         DRAW_SUPPORTS_NONDEFAULT_VISUAL = 0x10,
         // If set, then the Screen 'screen' in the callback can be different
-        // from the default Screen of the display passed to 'Draw' and can be
+        // from the default Screen of the default display and can be
         // on a different display.
         DRAW_SUPPORTS_ALTERNATE_SCREEN = 0x20
     };

gfx/thebes/src/cairo-gdk-utils.c

@@ -80,7 +80,6 @@ _convert_coord_to_unsigned_short (double coord, unsigned short *v)
 
 
 void cairo_draw_with_gdk (cairo_t *cr,
-                           GdkDrawable * drawable,
                            cairo_gdk_drawing_callback callback,
                            void * closure,
                            unsigned int width, unsigned int height,
@@ -101,7 +100,7 @@ void cairo_draw_with_gdk (cairo_t *cr,
     _convert_coord_to_short (matrix.y0 + device_offset_y, &offset_y);
 
     cairo_surface_flush (target);
-    callback (closure, drawable, offset_x, offset_y, NULL, 0);
+    callback (closure, target, offset_x, offset_y, NULL, 0);
     cairo_surface_mark_dirty (target);
 }
 

gfx/thebes/src/cairo-gdk-utils.h

@@ -52,11 +52,11 @@ CAIRO_BEGIN_DECLS
  * is composited if you call the callback multiple times with the same closure,
  * display and visual during a single cairo_draw_with_gdk call.
  * 
- * @return True on success, False on non-recoverable error
+ * @return True when able to draw, False otherwise
  */
 typedef cairo_bool_t (* cairo_gdk_drawing_callback)
     (void *closure,
-     GdkDrawable * drawable,
+     cairo_surface_t *surface,
      short offset_x, short offset_y,
      GdkRectangle * clip_rects, unsigned int num_rects);
 
@@ -136,7 +136,6 @@ typedef enum {
  * a surface for it.
  */
 void cairo_draw_with_gdk (cairo_t *cr,
-                          GdkDrawable * drawable,
                           cairo_gdk_drawing_callback callback,
                           void * closure,
                           unsigned int width, unsigned int height,

gfx/thebes/src/cairo-xlib-utils.c

@@ -20,6 +20,8 @@
  *
  * Contributor(s):
  *   rocallahan@novell.com
+ *   Vladimir Vukicevic <vladimir@pobox.com>
+ *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -204,6 +206,7 @@ _draw_with_xlib_direct (cairo_t *cr,
     Screen *screen;
     Visual *visual;
     cairo_bool_t have_rectangular_clip;
+    cairo_bool_t ret;
 
     target = cairo_get_group_target (cr);
     cairo_surface_get_device_offset (target, &device_offset_x, &device_offset_y);
@@ -301,11 +304,12 @@ _draw_with_xlib_direct (cairo_t *cr,
     /* we're good to go! */
     CAIRO_GDK_DRAWING_NOTE("TAKING FAST PATH\n");
     cairo_surface_flush (target);
-    callback (closure, GDK_DRAWABLE(gdk_xid_table_lookup(d)), 
-              offset_x, offset_y, rectangles,
+    ret = callback (closure, target, offset_x, offset_y, rectangles,
                     needs_clip ? rect_count : 0);
+    if (ret) {
         cairo_surface_mark_dirty (target);
-    return True;
+    }
+    return ret;
 }
 
 static cairo_surface_t *
@@ -364,7 +368,6 @@ _draw_onto_temp_xlib_surface (cairo_surface_t *temp_xlib_surface,
                               void *closure,
                               double background_gray_value)
 {
-    Drawable d = cairo_xlib_surface_get_drawable (temp_xlib_surface);
     cairo_bool_t result;
 
     cairo_t *cr = cairo_create (temp_xlib_surface);
@@ -377,8 +380,7 @@ _draw_onto_temp_xlib_surface (cairo_surface_t *temp_xlib_surface,
     cairo_surface_flush (temp_xlib_surface);
     /* no clipping is needed because the callback can't draw outside the native
        surface anyway */
-    result = callback (closure, GDK_DRAWABLE(gdk_xid_table_lookup(d)),
-            0, 0, NULL, 0);
+    result = callback (closure, temp_xlib_surface, 0, 0, NULL, 0);
     cairo_surface_mark_dirty (temp_xlib_surface);
     return result;
 }
@@ -492,7 +494,6 @@ _compute_alpha_values (uint32_t *black_data,
 
 void 
 cairo_draw_with_gdk (cairo_t *cr,
-                     GdkDrawable * drawable,
                      cairo_gdk_drawing_callback callback,
                      void * closure,
                      unsigned int width, unsigned int height,
@@ -505,7 +506,7 @@ cairo_draw_with_gdk (cairo_t *cr,
     cairo_surface_t *white_image_surface;
     unsigned char *black_data;
     unsigned char *white_data;
-    Display *dpy = gdk_x11_drawable_get_xdisplay(drawable);
+    Display *dpy = gdk_x11_get_default_xdisplay();
   
     if (result) {
         result->surface = NULL;

gfx/thebes/src/gfxGdkNativeRenderer.cpp

@@ -20,6 +20,7 @@
  *
  * Contributor(s):
  *   rocallahan@novell.com
+ *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -50,11 +51,17 @@ typedef struct {
 
 static cairo_bool_t
 NativeRendering(void *closure,
-                GdkDrawable * drawable,
+                cairo_surface_t *surface,
                 short offset_x, short offset_y,
                 GdkRectangle * rectangles, unsigned int num_rects)
 {
     NativeRenderingClosure* cl = (NativeRenderingClosure*)closure;
+    nsRefPtr<gfxASurface> gfxSurface = gfxASurface::Wrap(surface);
+    GdkDrawable *drawable =
+        gfxPlatformGtk::GetPlatform()->GetGdkDrawable(gfxSurface);
+    if (!drawable)
+        return 0;
+
     nsresult rv = cl->mRenderer->
         NativeDraw(drawable, offset_x, offset_y,
                    rectangles, num_rects);
@@ -96,7 +103,6 @@ gfxGdkNativeRenderer::Draw(gfxContext* ctx, int width, int height,
         cairoFlags |= CAIRO_GDK_DRAWING_SUPPORTS_NONDEFAULT_VISUAL;
     }
     cairo_draw_with_gdk(ctx->GetCairo(),
-                        gfxPlatformGtk::GetPlatform()->GetGdkDrawable(ctx->OriginalSurface()),
                         NativeRendering, 
                         &closure, width, height,
                         (flags & DRAW_IS_OPAQUE) ? CAIRO_GDK_DRAWING_OPAQUE : CAIRO_GDK_DRAWING_TRANSPARENT,

gfx/thebes/src/gfxPlatformGtk.cpp

@@ -21,6 +21,7 @@
  * Contributor(s):
  *   Vladimir Vukicevic <vladimir@pobox.com>
  *   Masayuki Nakano <masayuki@d-toybox.com>
+ *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -61,6 +62,7 @@
 #ifdef MOZ_X11
 #include <gdk/gdkx.h>
 #include "gfxXlibSurface.h"
+#include "cairo-xlib.h"
 #endif /* MOZ_X11 */
 
 #ifdef MOZ_DFB
@@ -90,8 +92,6 @@
 PRInt32 gfxPlatformGtk::sDPI = -1;
 gfxFontconfigUtils *gfxPlatformGtk::sFontconfigUtils = nsnull;
 
-static cairo_user_data_key_t cairo_gdk_drawable_key;
-
 #ifndef MOZ_PANGO
 typedef nsDataHashtable<nsStringHashKey, nsRefPtr<FontFamily> > FontTable;
 static FontTable *gPlatformFonts = NULL;
@@ -99,12 +99,11 @@ static FontTable *gPlatformFontAliases = NULL;
 static FT_Library gPlatformFTLibrary = NULL;
 #endif
 
-
-static cairo_user_data_key_t cairo_gdk_pixmap_key;
-static void do_gdk_pixmap_unref (void *data)
+static cairo_user_data_key_t cairo_gdk_drawable_key;
+static void do_gdk_drawable_unref (void *data)
 {
-    GdkPixmap *pmap = (GdkPixmap*)data;
-    gdk_pixmap_unref (pmap);
+    GdkDrawable *d = (GdkDrawable*) data;
+    g_object_unref (d);
 }
 
 gfxPlatformGtk::gfxPlatformGtk()
@@ -212,17 +211,16 @@ gfxPlatformGtk::CreateOffscreenSurface(const gfxIntSize& size,
             if (newSurface && newSurface->CairoStatus() == 0) {
                 // set up the surface to auto-unref the gdk pixmap when
                 // the surface is released
-                newSurface->SetData(&cairo_gdk_pixmap_key,
-                                    pixmap,
-                                    do_gdk_pixmap_unref);
                 SetGdkDrawable(newSurface, GDK_DRAWABLE(pixmap));
             } else {
                 // something went wrong with the surface creation.
                 // Ignore and let's fall back to image surfaces.
-                if (pixmap)
-                    gdk_pixmap_unref(pixmap);
                 newSurface = nsnull;
             }
+
+            // always unref; SetGdkDrawable takes its own ref
+            if (pixmap)
+                g_object_unref(pixmap);
         }
 
         if (!newSurface) {
@@ -722,18 +720,109 @@ gfxPlatformGtk::SetGdkDrawable(gfxASurface *target,
     if (target->CairoStatus())
         return;
 
+    gdk_drawable_ref(drawable);
+
     cairo_surface_set_user_data (target->CairoSurface(),
                                  &cairo_gdk_drawable_key,
                                  drawable,
-                                 NULL);
+                                 do_gdk_drawable_unref);
 }
 
+#ifdef MOZ_X11
+// Look for an existing Colormap that is known to be associated with visual.
+static GdkColormap *
+LookupGdkColormapForVisual(const Screen* screen, const Visual* visual)
+{
+    Display* dpy = DisplayOfScreen(screen);
+    GdkDisplay* gdkDpy = gdk_x11_lookup_xdisplay(dpy);
+    if (!gdkDpy)
+        return NULL;
+
+    // I wish there were a gdk_x11_display_lookup_screen.
+    gint screen_num = 0;
+    for (int s = 0; s < ScreenCount(dpy); ++s) {
+        if (ScreenOfDisplay(dpy, s) == screen) {
+            screen_num = s;
+            break;
+        }
+    }
+    GdkScreen* gdkScreen = gdk_display_get_screen(gdkDpy, screen_num);
+
+    // Common case: the display's default colormap
+    if (visual ==
+        GDK_VISUAL_XVISUAL(gdk_screen_get_system_visual(gdkScreen)))
+        return gdk_screen_get_system_colormap(gdkScreen);    
+
+    // widget/src/gtk2/mozcontainer.c uses gdk_rgb_get_colormap()
+    // which is inherited by child widgets, so this is the visual
+    // expected when drawing directly to widget surfaces or surfaces
+    // created using cairo_surface_create_similar with
+    // CAIRO_CONTENT_COLOR.
+    // gdk_screen_get_rgb_colormap is the generalization of
+    // gdk_rgb_get_colormap for any screen.
+    if (visual ==
+        GDK_VISUAL_XVISUAL(gdk_screen_get_rgb_visual(gdkScreen)))
+        return gdk_screen_get_rgb_colormap(gdkScreen);
+
+    // This is the visual expected on displays with the Composite
+    // extension enabled when the surface has been created using
+    // cairo_surface_create_similar with CAIRO_CONTENT_COLOR_ALPHA,
+    // as happens with non-unit opacity.
+    if (visual ==
+        GDK_VISUAL_XVISUAL(gdk_screen_get_rgba_visual(gdkScreen)))
+        return gdk_screen_get_rgba_colormap(gdkScreen);
+
+    return NULL;
+}
+#endif
+
 GdkDrawable *
 gfxPlatformGtk::GetGdkDrawable(gfxASurface *target)
 {
     if (target->CairoStatus())
         return nsnull;
 
-    return (GdkDrawable*) cairo_surface_get_user_data (target->CairoSurface(),
+    GdkDrawable *result;
+
+    result = (GdkDrawable*) cairo_surface_get_user_data (target->CairoSurface(),
                                                          &cairo_gdk_drawable_key);
+    if (result)
+        return result;
+
+#ifdef MOZ_X11
+    if (target->GetType() == gfxASurface::SurfaceTypeXlib) {
+        gfxXlibSurface *xs = (gfxXlibSurface*) target;
+
+        // try looking it up in gdk's table
+        result = (GdkDrawable*) gdk_xid_table_lookup(xs->XDrawable());
+        if (result) {
+            SetGdkDrawable(target, result);
+            return result;
+        }
+
+        // If all else fails, try doing a foreign_new
+        // but don't bother if we can't get a colormap.
+        // Without a colormap GDK won't know how to draw.
+        Screen *screen = cairo_xlib_surface_get_screen(xs->CairoSurface());
+        Visual *visual = cairo_xlib_surface_get_visual(xs->CairoSurface());
+        GdkColormap *cmap = LookupGdkColormapForVisual(screen, visual);
+        if (cmap == None)
+            return nsnull;
+
+        result = (GdkDrawable*) gdk_pixmap_foreign_new_for_display
+            (gdk_display_get_default(), xs->XDrawable());
+        if (result) {
+            gdk_drawable_set_colormap(result, cmap);
+
+            SetGdkDrawable(target, result);
+            // Release our ref.  The object is held by target.  Caller will
+            // only need to ref if it wants to keep the drawable longer than
+            // target.
+            g_object_unref(result);
+            return result;
+        }
+    }
+#endif
+
+    return nsnull;
 }

widget/src/gtk2/nsWindow.cpp

@@ -1730,7 +1730,8 @@ nsWindow::OnExposeEvent(GtkWidget *aWidget, GdkEventExpose *aEvent)
     // do double-buffering and clipping here
     nsRefPtr<gfxContext> ctx = rc->ThebesContext();
 
-    gfxPlatformGtk::GetPlatform()->SetGdkDrawable(ctx->OriginalSurface(), GDK_DRAWABLE(mDrawingarea->inner_window));
+    gfxPlatformGtk::GetPlatform()->SetGdkDrawable(ctx->OriginalSurface(),
+                                                  GDK_DRAWABLE(mDrawingarea->inner_window));
 
     // clip to the update region
     ctx->Save();
@@ -1800,6 +1801,7 @@ nsWindow::OnExposeEvent(GtkWidget *aWidget, GdkEventExpose *aEvent)
                 gfxPlatformGtk::GetPlatform()->SetGdkDrawable(
                         static_cast<gfxASurface *>(bufferPixmapSurface), 
                         GDK_DRAWABLE(bufferPixmap));
+
                 bufferPixmapSurface->SetDeviceOffset(gfxPoint(-boundsRect.x, -boundsRect.y));
                 nsCOMPtr<nsIRenderingContext> newRC;
                 nsresult rv = GetDeviceContext()->