1 files changed, 38 insertions, 0 deletions
diff --git a/guest/hals/hwcomposer/common/screen_view.cpp b/guest/hals/hwcomposer/common/screen_view.cpp
new file mode 100644
index 000000000..48f9fa6bd
--- /dev/null
+++ b/guest/hals/hwcomposer/common/screen_view.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "guest/hals/hwcomposer/common/screen_view.h"
+
+#include "common/libs/utils/size_utils.h"
+
+namespace cvd {
+
+int ScreenView::NextBuffer() {
+  int num_buffers = this->num_buffers();
+  last_buffer_ = num_buffers > 0 ? (last_buffer_ + 1) % num_buffers : -1;
+  return last_buffer_;
+}
+
+size_t ScreenView::buffer_size() const {
+  return line_length() * y_res() + 4 /* swiftshader padding */;
+}
+
+size_t ScreenView::line_length() const {
+  return cvd::AlignToPowerOf2(x_res() * bytes_per_pixel(), 4);
+}
+
+int ScreenView::bytes_per_pixel() const { return 4; }
+}  // namespace cvd