Initial checkin of chromecast content embedder (cast_shell) and related build scripts.

chromecast/ui/gfx/gfx_plane.cc

+// Copyright (c) 2014 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 "chromecast/ui/gfx/gfx_plane.h"
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace gfx {
+namespace chromecast {
+
+Osd::Osd(Surface* arg_surface)
+    : surface_(arg_surface) {
+  DCHECK(surface_.get());
+}
+
+Osd::~Osd() {
+}
+
+// static
+GfxPlane* GfxPlane::primary_ = NULL;
+
+GfxPlane::GfxPlane()
+    : num_surfaces_(0),
+      current_surface_(NULL) {
+}
+
+GfxPlane::~GfxPlane() {
+  // Make sure we haven't leaked any surfaces
+  LOG_IF(DFATAL, num_surfaces_ != 0)
+      << num_surfaces_ << " of surfaces are not released.";
+  if (this == primary_) {
+    primary_ = NULL;
+  }
+}
+
+void GfxPlane::Display(Surface* surface, const Rect& rect,
+                       const Point& frame_buffer_point) {
+  DCHECK(frame_buffer_.get());
+  DCHECK(surface);
+
+  // Keeps track of current surface to restore original bitmap when OSD
+  // surfaces are gone. Since all backing store surfaces are full screen,
+  // it's enough to remember only one (last) surface which displays something.
+  current_surface_ = surface;
+
+  if (osd_and_rects_.empty()) {  // Fast display for most cases.
+    frame_buffer_->Blit(surface, rect, frame_buffer_point);
+    return;
+  }
+
+  Rect frame_buffer_rect(frame_buffer_point, rect.size());
+  scoped_ptr<Surface> composite;
+  // Draws lowest priority OSD surfaces first.
+  for (std::list<OsdAndRect>::const_reverse_iterator
+           it = osd_and_rects_.rbegin(); it != osd_and_rects_.rend(); ++it) {
+    if (frame_buffer_rect.Intersects(it->rect)) {
+      // Creates a temporary composite surface and copies the original bitmap.
+      if (composite.get() == NULL) {
+        composite.reset(CreateSurface(rect.size()));
+        composite->Blit(surface, rect, Point(0, 0));
+      }
+
+      Rect overlapped_in_frame_buffer = gfx::IntersectRects(frame_buffer_rect,
+                                                            it->rect);
+      Point overlapped_origin_in_composite(
+          overlapped_in_frame_buffer.origin() -
+          frame_buffer_point.OffsetFromOrigin());
+      Rect overlapped_in_osd(
+          overlapped_in_frame_buffer.origin() -
+          it->rect.origin().OffsetFromOrigin(),
+          overlapped_in_frame_buffer.size());
+      composite->Composite(it->osd->surface(), overlapped_in_osd,
+                           overlapped_origin_in_composite);
+    }
+  }
+
+  // Blits composite surface if created.
+  if (composite.get() == NULL) {
+    frame_buffer_->Blit(surface, rect, frame_buffer_point);
+  } else {
+    frame_buffer_->Blit(composite.get(), Rect(composite->size()),
+                        frame_buffer_point);
+  }
+}
+
+void GfxPlane::OnRemoved(Surface* surface) {
+  if (surface == current_surface_) {
+    current_surface_ = NULL;
+  }
+}
+
+bool GfxPlane::IsOsdPlane() const {
+  return false;
+}
+
+Osd* GfxPlane::CreateOsd(const Size& size) {
+  return new Osd(CreateSurface(size));
+}
+
+void GfxPlane::AddOsd(Osd* osd, const Point& frame_buffer_point) {
+  OsdAndRect osd_rect;
+  osd_rect.rect = Rect(frame_buffer_point, osd->size());
+  osd_rect.osd = osd;
+  osd_and_rects_.push_front(osd_rect);
+  Refresh(osd_rect.rect);
+}
+
+void GfxPlane::RemoveOsd(Osd* osd, const Point& frame_buffer_point) {
+  for (std::list<OsdAndRect>::iterator it = osd_and_rects_.begin();
+       it != osd_and_rects_.end(); ++it) {
+    if (it->osd == osd
+        && it->rect.origin() == frame_buffer_point) {
+      Rect overlaid_rect(it->rect);
+      osd_and_rects_.erase(it);
+      Refresh(overlaid_rect);
+      return;
+    }
+  }
+}
+
+void GfxPlane::Refresh(const Rect& frame_buffer_rect) {
+  if (current_surface_) {
+    DCHECK(frame_buffer_.get());
+    DCHECK(current_surface_->size() == frame_buffer_->size());
+    current_surface_->Display(frame_buffer_rect, frame_buffer_rect.origin());
+  }
+}
+
+const Size GfxPlane::size() const {
+  if (frame_buffer_.get()) {
+    return frame_buffer_->size();
+  } else {
+    return Size(0, 0);
+  }
+}
+
+}  // namespace chromecast
+}  // namespace gfx