linux: add windowless plugin plumbing

webkit/glue/plugins/webplugin_delegate_impl_gtk.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/glue/plugins/webplugin_delegate_impl.h"
 
 #include <string>
 #include <vector>
 
 #include <gtk/gtk.h>
@@ skipping 356 matching lines @@
 
     // Otherwise, we need to recreate ourselves.
     g_object_unref(gdk_drawable_get_colormap(pixmap_));
     g_object_unref(pixmap_);
     pixmap_ = NULL;
   }
 
   // |sys_visual| is owned by gdk; we shouldn't free it.
   GdkVisual* sys_visual = gdk_visual_get_system();
   pixmap_ = gdk_pixmap_new(NULL,  // use width/height/depth params
-                           width, height, sys_visual->depth);
+                           std::max(1, width), std::max(1, height),
+                           sys_visual->depth);
   GdkColormap* colormap = gdk_colormap_new(gdk_visual_get_system(),
                                            FALSE);
   gdk_drawable_set_colormap(GDK_DRAWABLE(pixmap_), colormap);
 }
 
 #ifdef DEBUG_RECTANGLES
 namespace {
 
-// Draw a rectangle on a Cairo surface.
+// Draw a rectangle on a Cairo context.
 // Useful for debugging various rectangles involved in drawing plugins.
-void DrawDebugRectangle(cairo_surface_t* surface,
+void DrawDebugRectangle(cairo_t* cairo,
                         const gfx::Rect& rect,
                         float r, float g, float b) {
-  cairo_t* cairo = cairo_create(surface);
   cairo_set_source_rgba(cairo, r, g, b, 0.5);
   cairo_rectangle(cairo, rect.x(), rect.y(),
                   rect.width(), rect.height());
   cairo_stroke(cairo);
-  cairo_destroy(cairo);
 }
 
 }  // namespace
 #endif
 
 void WebPluginDelegateImpl::WindowlessPaint(cairo_t* context,
                                             const gfx::Rect& damage_rect) {
   // Compare to:
   // http://mxr.mozilla.org/firefox/source/layout/generic/nsObjectFrame.cpp:
   // nsPluginInstanceOwner::Renderer::NativeDraw().
@@ skipping 112 matching lines @@
 
   gfx::Rect pixmap_rect(0, 0,
                         draw_rect.x() + offset_x + draw_rect.width(),
                         draw_rect.y() + offset_y + draw_rect.height());
 
   EnsurePixmapAtLeastSize(pixmap_rect.width(), pixmap_rect.height());
 
   // Copy the current image into the pixmap, so the plugin can draw over
   // this background.
   cairo_t* cairo = gdk_cairo_create(pixmap_);
+  double surface_x = -offset_x;
+  double surface_y = -offset_y;
+  cairo_user_to_device(context, &surface_x, &surface_y);
   cairo_set_source_surface(cairo, cairo_get_target(context),
-                           offset_x, offset_y);
+                           -surface_x, -surface_y);
   cairo_rectangle(cairo, draw_rect.x() + offset_x, draw_rect.y() + offset_y,
                   draw_rect.width(), draw_rect.height());
   cairo_clip(cairo);
   cairo_paint(cairo);
   cairo_destroy(cairo);
 
   // Construct the paint message, targeting the pixmap.
   NPEvent np_event = {0};
   XGraphicsExposeEvent &event = np_event.xgraphicsexpose;
   event.type = GraphicsExpose;
   event.display = GDK_DISPLAY();
   event.drawable = GDK_PIXMAP_XID(pixmap_);
   event.x = draw_rect.x() + offset_x;
   event.y = draw_rect.y() + offset_y;
   event.width = draw_rect.width();
   event.height = draw_rect.height();
 
   // Tell the plugin to paint into the pixmap.
   static StatsRate plugin_paint("Plugin.Paint");
   StatsScope<StatsRate> scope(plugin_paint);
   NPError err = instance()->NPP_HandleEvent(&np_event);
   DCHECK_EQ(err, NPERR_NO_ERROR);
 
+  cairo_save(context);
   // Now copy the rendered image pixmap back into the drawing buffer.
   gdk_cairo_set_source_pixmap(context, pixmap_, -offset_x, -offset_y);
   cairo_rectangle(context, draw_rect.x(), draw_rect.y(),
                   draw_rect.width(), draw_rect.height());
   cairo_clip(context);
   cairo_paint(context);
 
 #ifdef DEBUG_RECTANGLES
   // Draw some debugging rectangles.
   // Pixmap rect = blue.
   DrawDebugRectangle(context, pixmap_rect, 0, 0, 1);
   // Drawing rect = red.
   DrawDebugRectangle(context, draw_rect, 1, 0, 0);
 #endif
+  cairo_restore(context);
 }
 
 void WebPluginDelegateImpl::WindowlessSetWindow(bool force_set_window) {
   if (!instance())
     return;
 
   if (window_rect_.IsEmpty())  // wait for geometry to be set.
     return;
 
   DCHECK(instance()->windowless());
@@ skipping 266 matching lines @@
   return stream;
 }
 
 void WebPluginDelegateImpl::URLRequestRouted(const std::string&url,
                                              bool notify_needed,
                                              intptr_t notify_data) {
   if (notify_needed) {
     instance()->SetURLLoadData(GURL(url.c_str()), notify_data);
   }
 }