Refactor Vaapi video decoder/encoder in preparation of Freon support

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/Xlib.h>
+}
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_image_glx.h"
+#include "ui/gl/gl_surface_glx.h"
+
+namespace gfx {
+
+namespace {
+
+// scoped_ptr functor for XFree(). Use as follows:
+//   scoped_ptr<XVisualInfo, ScopedPtrXFree> foo(...);
+// where "XVisualInfo" is any X type that is freed with XFree.
+struct ScopedPtrXFree {
+  void operator()(void* x) const { ::XFree(x); }
+};
+
+bool ValidFormat(unsigned internalformat) {
+  switch (internalformat) {
+    case GL_RGB:
+    case GL_RGBA:
+      return true;
+    default:
+      return false;
+  }
+}
+
+int TextureFormat(unsigned internalformat) {
+  switch (internalformat) {
+    case GL_RGB:
+      return GLX_TEXTURE_FORMAT_RGB_EXT;
+    case GL_RGBA:
+      return GLX_TEXTURE_FORMAT_RGBA_EXT;
+    default:
+      NOTREACHED();
+      return 0;
+  }
+}
+
+int BindToTextureFormat(unsigned internalformat) {
+  switch (internalformat) {
+    case GL_RGB:
+      return GLX_BIND_TO_TEXTURE_RGB_EXT;
+    case GL_RGBA:
+      return GLX_BIND_TO_TEXTURE_RGBA_EXT;
+    default:
+      NOTREACHED();
+      return 0;
+  }
+}
+
+unsigned PixmapDepth(unsigned internalformat) {
+  switch (internalformat) {
+    case GL_RGBA:
+      return 32u;
+    case GL_RGB:
+      return 24u;
+    default:
+      NOTREACHED();
+      return 0u;
+  }
+}
+
+bool ActualPixmapGeometry(XID pixmap, gfx::Size* size, unsigned* depth) {
+  XID root_return;
+  int x_return;
+  int y_return;
+  unsigned width_return;
+  unsigned height_return;
+  unsigned border_width_return;
+  unsigned depth_return;
+  if (!XGetGeometry(gfx::GetXDisplay(),
+                    pixmap,
+                    &root_return,
+                    &x_return,
+                    &y_return,
+                    &width_return,
+                    &height_return,
+                    &border_width_return,
+                    &depth_return))
+    return false;
+
+  if (size)
+    *size = gfx::Size(width_return, height_return);
+  if (depth)
+    *depth = depth_return;
+  return true;
+}
+
+unsigned ActualPixmapDepth(XID pixmap) {
+  unsigned depth;
+  if (!ActualPixmapGeometry(pixmap, NULL, &depth))
+    return -1;
+
+  return depth;
+}
+
+gfx::Size ActualPixmapSize(XID pixmap) {
+  gfx::Size size;
+  if (!ActualPixmapGeometry(pixmap, &size, NULL))
+    return gfx::Size();
+
+  return size;
+}
+
+}  // namespace anonymous
+
+GLImageGLX::GLImageGLX(const gfx::Size& size, unsigned internalformat)
+    : glx_pixmap_(0), size_(size), internalformat_(internalformat) {
+}
+
+GLImageGLX::~GLImageGLX() {
+  DCHECK_EQ(0u, glx_pixmap_);
+}
+
+bool GLImageGLX::Initialize(XID pixmap) {
+  if (!GLSurfaceGLX::IsTextureFromPixmapSupported()) {
+    DVLOG(0) << "GLX_EXT_texture_from_pixmap not supported.";
+    return false;
+  }
+
+  if (!ValidFormat(internalformat_)) {
+    DVLOG(0) << "Invalid format: " << internalformat_;
+    return false;
+  }
+
+  DCHECK_EQ(PixmapDepth(internalformat_), ActualPixmapDepth(pixmap));
+  DCHECK_EQ(size_.ToString(), ActualPixmapSize(pixmap).ToString());
+
+  int config_attribs[] = {
+      GLX_DRAWABLE_TYPE,                    GLX_PIXMAP_BIT,
+      GLX_BIND_TO_TEXTURE_TARGETS_EXT,      GLX_TEXTURE_2D_EXT,
+      BindToTextureFormat(internalformat_), GL_TRUE,
+      0};
+  int num_elements = 0;
+  scoped_ptr<GLXFBConfig, ScopedPtrXFree> config(
+      glXChooseFBConfig(gfx::GetXDisplay(),
+                        DefaultScreen(gfx::GetXDisplay()),
+                        config_attribs,
+                        &num_elements));
+  if (!config.get()) {
+    DVLOG(0) << "glXChooseFBConfig failed.";
+    return false;
+  }
+  if (!num_elements) {
+    DVLOG(0) << "glXChooseFBConfig returned 0 elements.";
+    return false;
+  }
+
+  int pixmap_attribs[] = {GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
+                          GLX_TEXTURE_FORMAT_EXT,
+                          TextureFormat(internalformat_), 0};
+  glx_pixmap_ = glXCreatePixmap(
+      gfx::GetXDisplay(), *config.get(), pixmap, pixmap_attribs);
+  if (!glx_pixmap_) {
+    DVLOG(0) << "glXCreatePixmap failed.";
+    return false;
+  }
+
+  return true;
+}
+
+void GLImageGLX::Destroy(bool have_context) {
+  if (glx_pixmap_) {
+    glXDestroyGLXPixmap(gfx::GetXDisplay(), glx_pixmap_);
+    glx_pixmap_ = 0;
+  }
+}
+
+gfx::Size GLImageGLX::GetSize() { return size_; }
+
+bool GLImageGLX::BindTexImage(unsigned target) {
+  if (!glx_pixmap_)
+    return false;
+
+  // Requires TEXTURE_2D target.
+  if (target != GL_TEXTURE_2D)
+    return false;
+
+  glXBindTexImageEXT(gfx::GetXDisplay(), glx_pixmap_, GLX_FRONT_LEFT_EXT, 0);
+  return true;
+}
+
+void GLImageGLX::ReleaseTexImage(unsigned target) {
+  DCHECK_NE(0u, glx_pixmap_);
+  DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D), target);
+
+  glXReleaseTexImageEXT(gfx::GetXDisplay(), glx_pixmap_, GLX_FRONT_LEFT_EXT);
+}
+
+bool GLImageGLX::CopyTexImage(unsigned target) {
+  return false;
+}
+
+bool GLImageGLX::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
+                                      int z_order,
+                                      OverlayTransform transform,
+                                      const Rect& bounds_rect,
+                                      const RectF& crop_rect) {
+  return false;
+}
+
+}  // namespace gfx