gpu: Add support for GLX_EXT_texture_from_pixmap extension.

ui/gl/gl_image_glx.cc

+// Copyright (c) 2012 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.
+
+extern "C" {
+#include <X11/extensions/Xcomposite.h>
+}
+
+#include "ui/gl/gl_image_glx.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "ui/gl/gl_surface_glx.h"
+
+namespace gfx {
+
+namespace {
+
+// scoped_ptr functor for XFree(). Use as follows:
+//   scoped_ptr_malloc<XVisualInfo, ScopedPtrXFree> foo(...);
+// where "XVisualInfo" is any X type that is freed with XFree.
+class ScopedPtrXFree {
+ public:
+  void operator()(void* x) const {
+    ::XFree(x);
+  }
+};
+
+int BindToTextureFormat(int depth) {
+  if (depth == 32)
+    return GLX_BIND_TO_TEXTURE_RGBA_EXT;
+
+  return GLX_BIND_TO_TEXTURE_RGB_EXT;
+}
+
+int TextureFormat(int depth) {
+  if (depth == 32)
+    return GLX_TEXTURE_FORMAT_RGBA_EXT;
+
+  return GLX_TEXTURE_FORMAT_RGB_EXT;
+}
+
+}  // namespace anonymous
+
+GLImageGLX::GLImageGLX(gfx::PluginWindowHandle window)
+  : display_(base::MessagePumpForUI::GetDefaultXDisplay()),
+    window_(window),
+    pixmap_(0),
+    glx_pixmap_(0) {
+}
+
+bool GLImageGLX::Initialize() {
+  if (!GLSurfaceGLX::IsTextureFromPixmapSupported()) {
+    LOG(ERROR) << "GLX_EXT_texture_from_pixmap not supported.";
+    return false;
+  }
+
+  XWindowAttributes attributes;
+  if (!XGetWindowAttributes(display_, window_, &attributes)) {
+    LOG(ERROR) << "XGetWindowAttributes failed for window " << window_ << ".";
+    return false;
+  }
+
+  XVisualInfo templ;
+  templ.visualid = XVisualIDFromVisual(attributes.visual);
+  int num_visinfo = 0;
+  scoped_ptr_malloc<XVisualInfo, ScopedPtrXFree> visinfo(
+      XGetVisualInfo(display_,
+                     VisualIDMask,
+                     &templ,
+                     &num_visinfo));
+  if (!visinfo.get()) {
+    LOG(ERROR) << "XGetVisualInfo failed for visual id " <<
+        templ.visualid << ".";
+    return false;
+  }
+  if (!num_visinfo) {
+    LOG(ERROR) << "XGetVisualInfo returned 0 elements.";
+    return false;
+  }
+
+  int config_attribs[] = {
+    GLX_VISUAL_ID, visinfo->visualid,
+    GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT,
+    GLX_BIND_TO_TEXTURE_TARGETS_EXT, GLX_TEXTURE_2D_EXT,
+    BindToTextureFormat(visinfo->depth), GL_TRUE,
+    0
+  };
+  int num_elements = 0;
+  scoped_ptr_malloc<GLXFBConfig, ScopedPtrXFree> config(
+      glXChooseFBConfig(display_,
+                        DefaultScreen(display_),
+                        config_attribs,
+                        &num_elements));
+  if (!config.get()) {
+    LOG(ERROR) << "glXChooseFBConfig failed.";
+    return false;
+  }
+  if (!num_elements) {
+    LOG(ERROR) << "glXChooseFBConfig returned 0 elements.";
+    return false;
+  }
+
+  // Create backing pixmap reference.
+  pixmap_ = XCompositeNameWindowPixmap(display_, window_);
+
+  XID root = 0;
+  int x = 0;
+  int y = 0;
+  unsigned int width = 0;
+  unsigned int height = 0;
+  unsigned int bw = 0;
+  unsigned int depth = 0;
+  if (!XGetGeometry(
+          display_, pixmap_, &root, &x, &y, &width, &height, &bw, &depth)) {
+    LOG(ERROR) << "XGetGeometry failed for pixmap " << pixmap_ << ".";
+    return false;
+  }
+
+  int pixmap_attribs[] = {
+    GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
+    GLX_TEXTURE_FORMAT_EXT, TextureFormat(visinfo->depth),
+    0
+  };
+  glx_pixmap_ = glXCreatePixmap(
+      display_,
+      *config.get(),
+      pixmap_,
+      pixmap_attribs);
+  if (!glx_pixmap_) {
+    LOG(ERROR) << "glXCreatePixmap failed.";
+    return false;
+  }
+
+  size_ = gfx::Size(width, height);
+  return true;
+}
+
+void GLImageGLX::Destroy() {
+  if (glx_pixmap_) {
+    glXDestroyGLXPixmap(display_, glx_pixmap_);
+    glx_pixmap_ = 0;
+  }
+  if (pixmap_) {
+    XFreePixmap(display_, pixmap_);
+    pixmap_ = 0;
+  }
+}
+
+gfx::Size GLImageGLX::GetSize() {
+  return size_;
+}
+
+bool GLImageGLX::BindTexImage() {
+  if (!glx_pixmap_)
+    return false;
+
+  glXBindTexImageEXT(display_, glx_pixmap_, GLX_FRONT_LEFT_EXT, 0);
+  return true;
+}
+
+void GLImageGLX::ReleaseTexImage() {
+  if (!glx_pixmap_)
+    return;
+
+  glXReleaseTexImageEXT(display_, glx_pixmap_, GLX_FRONT_LEFT_EXT);
+}
+
+GLImageGLX::~GLImageGLX() {
+  Destroy();
+}
+
+}  // namespace gfx