Add the xrender backend to the window manager.

compositor/xrender/xrender_visitor.cc

Index: compositor/xrender/xrender_visitor.cc
diff --git a/compositor/xrender/xrender_visitor.cc b/compositor/xrender/xrender_visitor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..22826457b381627445c5a6fb1593944ec5539e7f
--- /dev/null
+++ b/compositor/xrender/xrender_visitor.cc
@@ -0,0 +1,309 @@
+// Copyright (c) 2011 The Chromium OS 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 "window_manager/compositor/xrender/xrender_visitor.h"
+
+#include <X11/extensions/Xrender.h>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/scoped_ptr.h"
+#include "window_manager/image_container.h"
+#include "window_manager/image_enums.h"
+#include "window_manager/util.h"
+#include "window_manager/x11/x_connection.h"
+
+
+#ifndef COMPOSITOR_XRENDER
+#error Need COMPOSITOR_XRENDER defined to compile this file
+#endif
+
+namespace window_manager {
+
+const int kRGBPictureBitDepth = 24;
+const int kRGBAPictureBitDepth = 32;
+
+class XRenderPictureData : public TextureData {
+ public:
+  XRenderPictureData(XConnection* xconn)
+      : pixmap_(0),
+        xconn_(xconn) {
+  }
+  virtual ~XRenderPictureData() {
+    xconn_->RenderFreePicture(texture());
+  }
+
+  // Initialize our texture and make it contain the current contents of the
+  // passed-in pixmap.  False is returned if the process fails (in
+  // which case this object should be thrown away).
+  bool Init(XPixmap pixmap, int bpp) {
+    XPicture picture = xconn_->RenderCreatePicture(pixmap, bpp);
+    set_texture(picture);
+    return (picture != None);
+  }
+
+ private:
+  // The actor's X pixmap.  Ownership of the pixmap remains with the caller.
+  XPixmap pixmap_;
+
+  XConnection* xconn_;  // Not owned.
+};
+
+XRenderDrawVisitor::XRenderDrawVisitor(RealCompositor* compositor,
+                                       Compositor::StageActor* stage)
+    : root_window_(None),
+      back_picture_(None),
+      back_pixmap_(None),
+      stage_picture_(None),
+      compositor_(NULL),
+      xconn_(compositor->x_conn()),
+      stage_(NULL),
+      ancestor_opacity_(1.0),
+      has_fullscreen_actor_(false) {
+  // Check for the XRender extension.
+  CHECK(xconn_->RenderQueryExtension());
+
+  CHECK(AllocateXResources(stage));
+}
+
+XRenderDrawVisitor::~XRenderDrawVisitor() {
+  CHECK(FreeXResources());
+}
+
+void XRenderDrawVisitor::BindImage(const ImageContainer& container,
+                                   RealCompositor::ImageActor* actor) {
+  XPixmap pixmap = xconn_->CreatePixmapFromContainer(container);
+
+  scoped_ptr<window_manager::XRenderPictureData> data(
+      new XRenderPictureData(this->xconn_));
+  data->Init(pixmap, kRGBAPictureBitDepth);
+  actor->set_texture_data(data.release());
+}
+
+void XRenderDrawVisitor::VisitStage(RealCompositor::StageActor* actor) {
+  if (!actor->IsVisible())
+    return;
+
+  stage_ = actor;
+
+  if (actor->was_resized()) {
+    CHECK(FreeXResources());
+    CHECK(AllocateXResources(actor));
+    actor->unset_was_resized();
+  }
+
+  // If we don't have a full screen actor we do a fill with the stage color.
+  if (!has_fullscreen_actor_) {
+    const Compositor::Color& color = actor->stage_color();
+    xconn_->RenderFillRectangle(back_picture_,
+                                color.red,
+                                color.green,
+                                color.blue,
+                                Point(0, 0),
+                                root_geometry_.bounds.size());
+  }
+
+#ifdef EXTRA_LOGGING
+  DLOG(INFO) << "Starting Render pass.";
+#endif
+
+  ancestor_opacity_ = actor->opacity();
+
+  // Walk the actors and render them
+  VisitContainer(actor);
+
+#ifdef EXTRA_LOGGING
+  DLOG(INFO) << "Ending Render pass.";
+#endif
+
+  if (!damaged_region_.empty()) {
+    Matrix4 identity = Matrix4::identity();
+    identity[0][0] = damaged_region_.width;
+    identity[1][1] = damaged_region_.height;
+    identity[3][0] = damaged_region_.x;
+    identity[3][1] = root_geometry_.bounds.height -
+                     damaged_region_.y - damaged_region_.height;
+
+    xconn_->RenderComposite(false,
+                            back_picture_,
+                            None,
+                            stage_picture_,
+                            Point(damaged_region_.x,
+                                  root_geometry_.bounds.height -
+                                  damaged_region_.y -
+                                  damaged_region_.height),
+                            Point(0, 0),
+                            identity,
+                            damaged_region_.size());
+  } else {
+    Matrix4 identity = Vectormath::Aos::Matrix4::identity();
+    identity[0][0] = root_geometry_.bounds.width;
+    identity[1][1] = root_geometry_.bounds.height;
+    xconn_->RenderComposite(false,
+                            back_picture_,
+                            None,
+                            stage_picture_,
+                            Point(0, 0),
+                            Point(0, 0),
+                            identity,
+                            root_geometry_.bounds.size());
+  }
+
+  stage_ = NULL;
+}
+
+void XRenderDrawVisitor::VisitContainer(RealCompositor::ContainerActor* actor) {
+  if (!actor->IsVisible())
+    return;
+
+#ifdef EXTRA_LOGGING
+  DLOG(INFO) << "Drawing container " << actor->name() << ".";
+  DLOG(INFO) << "  at: (" << actor->x() << ", "  << actor->y()
+             << ", " << actor->z() << ") with scale: ("
+             << actor->scale_x() << ", "  << actor->scale_y() << ") at size ("
+             << actor->width() << "x"  << actor->height() << ")";
+#endif
+  RealCompositor::ActorVector children = actor->GetChildren();
+
+  float original_opacity = ancestor_opacity_;
+  ancestor_opacity_ *= actor->opacity();
+
+  // Walk backwards so we go back to front.
+  RealCompositor::ActorVector::const_reverse_iterator iterator;
+  for (iterator = children.rbegin(); iterator != children.rend();
+       ++iterator) {
+    RealCompositor::Actor* child = *iterator;
+
+    if (child->IsVisible()) {
+#ifdef EXTRA_LOGGING
+      DLOG(INFO) << "Drawing child " << child->name()
+                 << " (visible: " << child->IsVisible()
+                 << ", has_children: " << child->has_children()
+                 << ", opacity: " << child->opacity()
+                 << ", ancestor_opacity: " << ancestor_opacity_
+                 << ", is_opaque: " << child->is_opaque() << ")";
+#endif
+      child->Accept(this);
+    } else {
+#ifdef EXTRA_LOGGING
+      DLOG(INFO) << "NOT drawing child " << child->name()
+                 << " (visible: " << child->IsVisible()
+                 << ", has_children: " << child->has_children()
+                 << ", opacity: " << child->opacity()
+                 << ", ancestor_opacity: " << ancestor_opacity_
+                 << ", is_opaque: " << child->is_opaque() << ")";
+#endif
+    }
+
+    // Reset ancestor opacity.
+    ancestor_opacity_ = original_opacity;
+  }
+}
+
+void XRenderDrawVisitor::VisitImage(RealCompositor::ImageActor* actor) {
+  if (!actor->IsVisible())
+    return;
+
+  // All ImageActors are also QuadActors, and so we let the
+  // QuadActor do all the actual drawing.
+  VisitQuad(actor);
+}
+
+void XRenderDrawVisitor::VisitTexturePixmap(
+    RealCompositor::TexturePixmapActor* actor) {
+  if (!actor->IsVisible())
+    return;
+
+  // Make sure we have an XRender pic for this pixmap
+  if (!actor->texture_data())  {
+    if (actor->pixmap()) {
+      scoped_ptr<window_manager::XRenderPictureData>
+          data(new XRenderPictureData(this->xconn_));
+      data->Init(actor->pixmap(),
+                 actor->pixmap_is_opaque() ?
+                 kRGBPictureBitDepth : kRGBAPictureBitDepth);
+      actor->set_texture_data(data.release());
+    }
+  }
+
+  // All texture pixmaps are also QuadActors, and so we let the
+  // QuadActor do all the actual drawing.
+  VisitQuad(actor);
+}
+
+void XRenderDrawVisitor::VisitQuad(RealCompositor::QuadActor* actor) {
+  if (!actor->IsVisible())
+    return;
+
+#ifdef EXTRA_LOGGING
+  DLOG(INFO) << "Drawing quad " << actor->name() << ".";
+#endif
+
+  // Calculate the vertex colors, taking into account the actor color,
+  // opacity and the dimming gradient.
+  float actor_opacity = actor->is_opaque() ?
+                        1.f :
+                        actor->opacity() * ancestor_opacity_;
+  float dimmed_transparency_begin = 1.f - actor->dimmed_opacity_begin();
+  float dimmed_transparency_end = 1.f - actor->dimmed_opacity_end();
+  float red = actor->color().red;
+  float green = actor->color().green;
+  float blue = actor->color().blue;
+  DCHECK_LE(actor_opacity, 1.f);
+  DCHECK_GE(actor_opacity, 0.f);
+  DCHECK_LE(dimmed_transparency_begin, 1.f);
+  DCHECK_GE(dimmed_transparency_begin, 0.f);
+  DCHECK_LE(dimmed_transparency_end, 1.f);
+  DCHECK_GE(dimmed_transparency_end, 0.f);
+  DCHECK_LE(red, 1.f);
+  DCHECK_GE(red, 0.f);
+  DCHECK_LE(green, 1.f);
+  DCHECK_GE(green, 0.f);
+  DCHECK_LE(blue, 1.f);
+  DCHECK_GE(blue, 0.f);
+
+  xconn_->RenderComposite(
+      !actor->is_opaque(),
+      static_cast<XPicture>(actor->texture_data()->texture()),
+      static_cast<XPicture>(None),
+      back_picture_,
+      Point(0, 0),
+      Point(0, 0),
+      actor->model_view(),
+      actor->GetBounds().size());
+}
+
+bool XRenderDrawVisitor::FreeXResources() {
+  return xconn_->FreePixmap(back_pixmap_) &&
+         xconn_->RenderFreePicture(back_picture_) &&
+         xconn_->RenderFreePicture(stage_picture_);
+}
+
+bool XRenderDrawVisitor::AllocateXResources(Compositor::StageActor* stage) {
+  // Find root window geometry.
+  root_window_ = stage->GetStageXWindow();
+  xconn_->GetWindowGeometry(root_window_, &root_geometry_);
+
+  // Create back pixmap.
+  back_pixmap_ =
+      xconn_->CreatePixmap(
+          root_window_,
+          root_geometry_.bounds.size(),
+          root_geometry_.depth);
+
+  // Create back picture.
+  back_picture_ = xconn_->RenderCreatePicture(back_pixmap_,
+                                              kRGBPictureBitDepth);
+
+  // Create stage picture.
+  stage_picture_ = xconn_->RenderCreatePicture(root_window_,
+                                               kRGBPictureBitDepth);
+
+  return (back_pixmap_ != None) &&
+         (back_picture_ != None) &&
+         (stage_picture_ != None);
+}
+
+
+}  // namespace window_manager