command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/service/path_manager.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 "gpu/command_buffer/service/path_manager.h"
+#include "base/logging.h"
+#include "base/strings/stringprintf.h"
+#include "gpu/command_buffer/common/gles2_cmd_utils.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace gpu {
+namespace gles2 {
+
+PathManager::PathManager() : have_context_(true) {
+}
+
+PathManager::~PathManager() {
+  DCHECK(path_map_.empty());
+}
+
+void PathManager::Destroy(bool have_context) {
+  have_context_ = have_context;
+  if (have_context_) {
+    for (PathMap::iterator it = path_map_.begin(); it != path_map_.end();
+         ++it) {
+      glDeletePathsNV(it->second, 1);
+    }
+  }
+  path_map_.clear();
+}
+
+void PathManager::CreatePath(GLuint client_id, GLuint service_id) {
+  path_map_.insert(std::make_pair(client_id, service_id));
+}
+
+bool PathManager::GetPath(GLuint client_id, GLuint* service_id) {
+  PathMap::iterator it = path_map_.find(client_id);
+  if (it == path_map_.end())
+    return false;
+
+  if (service_id)
+    *service_id = it->second;
+  return true;
+}
+
+void PathManager::RemovePaths(GLuint path, GLuint range) {
+  for (GLuint ii = path; ii < path + range; ++ii) {
+    PathMap::iterator it = path_map_.find(ii);
+    if (it == path_map_.end())
+      continue;
+    glDeletePathsNV(it->second, 1);
+    path_map_.erase(it);
+  }
+}
+
+}  // namespace gles2
+}  // namespace gpu