Enable accelerated compositing of web pages when using webkit compositor

content/browser/renderer_host/image_transport_client.cc

+// Copyright (c) 2011 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 "content/browser/renderer_host/image_transport_client.h"
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xcomposite.h>
+
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "third_party/angle/include/EGL/egl.h"
+#include "third_party/angle/include/EGL/eglext.h"
+#include "ui/gfx/gl/gl_bindings.h"
+#include "ui/gfx/gl/gl_implementation.h"
+#include "ui/gfx/gl/gl_surface_egl.h"
+#include "ui/gfx/gl/gl_surface_glx.h"
+#include "ui/gfx/size.h"
+
+namespace {
+
+class ScopedPtrXFree {
+ public:
+  void operator()(void* x) const {
+    ::XFree(x);
+  }
+};
+
+GLuint CreateTexture() {
+  GLuint texture;
+  glGenTextures(1, &texture);
+  glBindTexture(GL_TEXTURE_2D, texture);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  return texture;
+}
+
+class ImageTransportClientEGL : public ImageTransportClient {
+ public:
+  explicit ImageTransportClientEGL(ui::SharedResources* resources)
+      : resources_(resources),
+        image_(NULL) {
+  }
+
+  virtual ~ImageTransportClientEGL() {
+    if (image_) {
+      resources_->MakeSharedContextCurrent();
+      eglDestroyImageKHR(gfx::GLSurfaceEGL::GetHardwareDisplay(), image_);
+      glFlush();
+    }
+  }
+
+  virtual unsigned int Initialize(uint64* surface_id) {
+    resources_->MakeSharedContextCurrent();
+    image_ = eglCreateImageKHR(
+        gfx::GLSurfaceEGL::GetHardwareDisplay(), EGL_NO_CONTEXT,
+        EGL_NATIVE_PIXMAP_KHR, reinterpret_cast<void*>(*surface_id), NULL);
+    if (!image_)
+      return 0;
+    GLuint texture = CreateTexture();
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image_);
+    glFlush();
+    return texture;
+  }
+
+  virtual void Acquire() { }
+  virtual void Release() { }
+  virtual bool Flipped() { return true; }
+  virtual TransportDIB::Handle Handle() const {
+    return TransportDIB::DefaultHandleValue();
+  }
+
+ private:
+  ui::SharedResources* resources_;
+  EGLImageKHR image_;
+};
+
+class ImageTransportClientGLX : public ImageTransportClient {
+ public:
+  explicit ImageTransportClientGLX(ui::SharedResources* resources)
+      : resources_(resources),
+        pixmap_(0),
+        glx_pixmap_(0),
+        texture_(0) {
+  }
+
+  virtual ~ImageTransportClientGLX() {
+    Display* dpy = gfx::GLSurfaceGLX::GetDisplay();
+    if (glx_pixmap_)
+      glXDestroyGLXPixmap(dpy, glx_pixmap_);
+    if (pixmap_)
+      XFreePixmap(dpy, pixmap_);
+  }
+
+  virtual unsigned int Initialize(uint64* surface_id) {
+    resources_->MakeSharedContextCurrent();
+    if (!InitializeOneOff())
+        return 0;
+
+    // Create pixmap from window.
+    // We receive a window here rather than a pixmap directly because drivers
+    // require (or required) that the pixmap used to create the GL texture be
+    // created in the same process as the texture.
+    Display* dpy = gfx::GLSurfaceGLX::GetDisplay();
+    pixmap_ = XCompositeNameWindowPixmap(dpy, *surface_id);
+
+    const int pixmapAttribs[] = {
+      GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
+      GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGB_EXT,
+      0
+    };
+
+    glx_pixmap_ = glXCreatePixmap(dpy, fbconfig_.Get(), pixmap_, pixmapAttribs);
+
+    texture_ = CreateTexture();
+    return texture_;
+  }
+
+  virtual void Acquire() {
+    Display* dpy = gfx::GLSurfaceGLX::GetDisplay();
+    glBindTexture(GL_TEXTURE_2D, texture_);
+    glXBindTexImageEXT(dpy, glx_pixmap_, GLX_FRONT_LEFT_EXT, NULL);
+  }
+
+  virtual void Release() {
+    Display* dpy = gfx::GLSurfaceGLX::GetDisplay();
+    glXReleaseTexImageEXT(dpy, glx_pixmap_, GLX_FRONT_LEFT_EXT);
+  }
+
+  virtual bool Flipped() { return false; }
+  virtual TransportDIB::Handle Handle() const {
+    return TransportDIB::DefaultHandleValue();
+  }
+
+ private:
+  static bool InitializeOneOff() {
+    static bool initialized = false;
+    if (initialized)
+      return true;
+
+    Display* dpy = gfx::GLSurfaceGLX::GetDisplay();
+
+    int event_base, error_base;
+    if (XCompositeQueryExtension(dpy, &event_base, &error_base)) {
+      int major = 0, minor = 2;
+      XCompositeQueryVersion(dpy, &major, &minor);
+      if (major == 0 && minor < 2) {
+        LOG(ERROR) << "Pixmap from window not supported.";
+        return false;
+      }
+    }
+    // Wrap the pixmap in a GLXPixmap
+    int screen = DefaultScreen(dpy);
+    XWindowAttributes gwa;
+    XGetWindowAttributes(dpy, RootWindow(dpy, screen), &gwa);
+    unsigned int visualid = XVisualIDFromVisual(gwa.visual);
+
+    int nfbconfigs, config;
+    scoped_ptr_malloc<GLXFBConfig, ScopedPtrXFree> fbconfigs(
+        glXGetFBConfigs(dpy, screen, &nfbconfigs));
+
+    for (config = 0; config < nfbconfigs; config++) {
+      XVisualInfo* visinfo = glXGetVisualFromFBConfig(
+          dpy, fbconfigs.get()[config]);
+      if (!visinfo || visinfo->visualid != visualid)
+        continue;
+
+      int value;
+      glXGetFBConfigAttrib(dpy,
+          fbconfigs.get()[config],
+          GLX_DRAWABLE_TYPE,
+          &value);
+      if (!(value & GLX_PIXMAP_BIT))
+        continue;
+
+      glXGetFBConfigAttrib(dpy,
+          fbconfigs.get()[config],
+          GLX_BIND_TO_TEXTURE_TARGETS_EXT,
+          &value);
+      if (!(value & GLX_TEXTURE_2D_BIT_EXT))
+        continue;
+
+      glXGetFBConfigAttrib(dpy,
+          fbconfigs.get()[config],
+          GLX_BIND_TO_TEXTURE_RGB_EXT,
+          &value);
+      if (value == GL_FALSE)
+        continue;
+
+      break;
+    }
+
+    if (config == nfbconfigs) {
+      LOG(ERROR)
+        << "Could not find configuration suitable for binding a pixmap "
+        << "as a texture.";
+      return false;
+    }
+    fbconfig_.Get() = fbconfigs.get()[config];
+    initialized = true;
+    return initialized;
+  }
+
+  ui::SharedResources* resources_;
+  XID pixmap_;
+  XID glx_pixmap_;
+  GLuint texture_;
+  static base::LazyInstance<GLXFBConfig> fbconfig_;
+};
+
+base::LazyInstance<GLXFBConfig> ImageTransportClientGLX::fbconfig_(
+    base::LINKER_INITIALIZED);
+
+class ImageTransportClientOSMesa : public ImageTransportClient {
+ public:
+  ImageTransportClientOSMesa(ui::SharedResources* resources,
+                             const gfx::Size& size)
+      : resources_(resources),
+        size_(size),
+        texture_(0) {
+  }
+
+  virtual ~ImageTransportClientOSMesa() {
+  }
+
+  virtual unsigned int Initialize(uint64* surface_id) {
+    // We expect to make the id here, so don't want the other end giving us one
+    DCHECK_EQ(*surface_id, static_cast<uint64>(0));
+
+    // It's possible that this ID gneration could clash with IDs from other
+    // AcceleratedSurfaceContainerTouch* objects, however we should never have
+    // ids active from more than one type at the same time, so we have free
+    // reign of the id namespace.
+    *surface_id = next_id_++;
+
+    shared_mem_.reset(
+        TransportDIB::Create(size_.GetArea() * 4,  // GL_RGBA=4 B/px
+        *surface_id));
+    if (!shared_mem_.get())
+      return 0;
+
+    resources_->MakeSharedContextCurrent();
+    texture_ = CreateTexture();
+    return texture_;
+  }
+
+  virtual void Acquire() {
+    glBindTexture(GL_TEXTURE_2D, texture_);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
+                 size_.width(), size_.height(), 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, shared_mem_->memory());
+  }
+
+  virtual void Release() { }
+  virtual bool Flipped() { return false; }
+  virtual TransportDIB::Handle Handle() const { return shared_mem_->handle(); }
+
+ private:
+  ui::SharedResources* resources_;
+  gfx::Size size_;
+  scoped_ptr<TransportDIB> shared_mem_;
+  GLuint texture_;
+  static uint32 next_id_;
+};
+uint32 ImageTransportClientOSMesa::next_id_ = 0;
+
+}  // anonymous namespace
+
+ImageTransportClient* ImageTransportClient::Create(
+    ui::SharedResources* resources,
+    const gfx::Size& size) {
+  switch (gfx::GetGLImplementation()) {
+    case gfx::kGLImplementationDesktopGL:
+      return new ImageTransportClientGLX(resources);
+    case gfx::kGLImplementationEGLGLES2:
+      return new ImageTransportClientEGL(resources);
+    case gfx::kGLImplementationOSMesaGL:
+      return new ImageTransportClientOSMesa(resources, size);
+    default:
+      NOTREACHED();
+      return NULL;
+  }
+}