drm_hwcomposer: Initial stub HWC2 am: ed2ec4b0b3 am: 30d6f3b938

am: 3b3944d17c

Change-Id: Iaca905f15a17202b54b7ecf5ba1878f4d67bebec

3 files changed, 589 insertions, 6 deletions

diff --git a/Android.mk b/Android.mk
index 538c4da..98ce3a6 100644
--- a/Android.mk
+++ b/Android.mk
@@ -30,7 +30,7 @@ LOCAL_SHARED_LIBRARIES := \
 
 
 LOCAL_C_INCLUDES := \
-        external/drm_gralloc \
+	external/drm_gralloc \
 	external/libdrm \
 	external/libdrm/include/drm \
 	system/core/include/utils \
@@ -49,20 +49,24 @@ LOCAL_SRC_FILES := \
 	drmdisplaycompositor.cpp \
 	drmencoder.cpp \
 	drmeventlistener.cpp \
+	drmhwctwo.cpp \
 	drmmode.cpp \
 	drmplane.cpp \
 	drmproperty.cpp \
 	glworker.cpp \
-	hwcomposer.cpp \
-        hwcutils.cpp \
-        platform.cpp \
-        platformdrmgeneric.cpp \
-        platformnv.cpp \
+	hwcutils.cpp \
+	platform.cpp \
+	platformdrmgeneric.cpp \
+	platformnv.cpp \
 	separate_rects.cpp \
 	virtualcompositorworker.cpp \
 	vsyncworker.cpp \
 	worker.cpp
 
+LOCAL_CPPFLAGS += \
+	-DHWC2_USE_CPP11 \
+	-DHWC2_INCLUDE_STRINGIFICATION
+
 ifeq ($(strip $(BOARD_DRM_HWCOMPOSER_BUFFER_IMPORTER)),nvidia-gralloc)
 LOCAL_CPPFLAGS += -DUSE_NVIDIA_IMPORTER
 else
diff --git a/drmhwctwo.cpp b/drmhwctwo.cpp
new file mode 100644
index 0000000..e7fecb8
--- /dev/null
+++ b/drmhwctwo.cpp
@@ -0,0 +1,438 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#define ATRACE_TAG ATRACE_TAG_GRAPHICS
+#define LOG_TAG "hwc-drm-two"
+
+#include "drmhwctwo.h"
+
+#include <cutils/log.h>
+#include <hardware/hwcomposer2.h>
+
+namespace android {
+
+DrmHwcTwo::DrmHwcTwo() {
+  common.close = HookDevClose;
+  getCapabilities = HookDevGetCapabilities;
+  getFunction = HookDevGetFunction;
+}
+
+template <typename... Args>
+static inline HWC2::Error unsupported(char const *func, Args... /*args*/) {
+  ALOGV("Unsupported function: %s", func);
+  return HWC2::Error::Unsupported;
+}
+
+HWC2::Error DrmHwcTwo::CreateVirtualDisplay(uint32_t width, uint32_t height,
+                                            int32_t *format,
+                                            hwc2_display_t *display) {
+  // TODO: Implement virtual display
+  return unsupported(__func__, width, height, display);
+}
+
+HWC2::Error DrmHwcTwo::DestroyVirtualDisplay(hwc2_display_t display) {
+  return unsupported(__func__, display);
+}
+
+void DrmHwcTwo::Dump(uint32_t *size, char *buffer) {
+  unsupported(__func__, size, buffer);
+}
+
+uint32_t DrmHwcTwo::GetMaxVirtualDisplayCount() {
+  unsupported(__func__);
+  return 0;
+}
+
+HWC2::Error DrmHwcTwo::RegisterCallback(int32_t descriptor,
+                                         hwc2_callback_data_t data,
+                                         hwc2_function_pointer_t function) {
+  return unsupported(__func__, descriptor, data, function);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::AcceptDisplayChanges() {
+  return unsupported(__func__);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::CreateLayer(hwc2_layer_t *layer) {
+  return unsupported(__func__, layer);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::DestroyLayer(hwc2_layer_t layer) {
+  return unsupported(__func__, layer);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetActiveConfig(hwc2_config_t *config) {
+  return unsupported(__func__, config);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetChangedCompositionTypes(
+    uint32_t *num_elements, hwc2_layer_t *layers, int32_t *types) {
+  return unsupported(__func__, num_elements, layers, types);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetClientTargetSupport(uint32_t width,
+                                                           uint32_t height,
+                                                           int32_t format,
+                                                           int32_t dataspace) {
+  return unsupported(__func__, width, height, format, dataspace);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetColorModes(uint32_t *num_modes,
+                                                  int32_t *modes) {
+  return unsupported(__func__, num_modes, modes);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetDisplayAttribute(hwc2_config_t config,
+                                                        int32_t attribute,
+                                                        int32_t *value) {
+  return unsupported(__func__, config, attribute, value);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetDisplayConfigs(uint32_t *num_configs,
+                                                     hwc2_config_t *configs) {
+  return unsupported(__func__, num_configs, configs);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetDisplayName(uint32_t *size, char *name) {
+  return unsupported(__func__, size, name);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetDisplayRequests(
+    int32_t *display_requests, uint32_t *num_elements, hwc2_layer_t *layers,
+    int32_t *layer_requests) {
+  return unsupported(__func__, display_requests, num_elements, layers,
+                     layer_requests);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetDisplayType(int32_t *type) {
+  return unsupported(__func__, type);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetDozeSupport(int32_t *support) {
+  return unsupported(__func__, support);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::GetReleaseFences(uint32_t *num_elements,
+                                                     hwc2_layer_t *layers,
+                                                     int32_t *fences) {
+  return unsupported(__func__, num_elements, layers, fences);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::PresentDisplay(int32_t *retire_fence) {
+  return unsupported(__func__, retire_fence);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::SetActiveConfig(hwc2_config_t config) {
+  return unsupported(__func__, config);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::SetClientTarget(buffer_handle_t target,
+                                                   int32_t acquire_fence,
+                                                   int32_t dataspace,
+                                                   hwc_region_t damage) {
+  return unsupported(__func__, target, acquire_fence, dataspace, damage);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::SetColorMode(int32_t mode) {
+  return unsupported(__func__, mode);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::SetColorTransform(const float *matrix,
+                                                      int32_t hint) {
+  return unsupported(__func__, matrix, hint);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::SetOutputBuffer(buffer_handle_t buffer,
+                                                    int32_t release_fence) {
+  return unsupported(__func__, buffer, release_fence);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::SetPowerMode(int32_t mode) {
+  return unsupported(__func__, mode);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::SetVsyncEnabled(int32_t enabled) {
+  return unsupported(__func__, enabled);
+}
+
+HWC2::Error DrmHwcTwo::HwcDisplay::ValidateDisplay(uint32_t *num_types,
+                                                    uint32_t *num_requests) {
+  return unsupported(__func__, num_types, num_requests);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetCursorPosition(int32_t x, int32_t y) {
+  return unsupported(__func__, x, y);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerBlendMode(int32_t mode) {
+  return unsupported(__func__, mode);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerBuffer(buffer_handle_t buffer,
+                                                 int32_t acquire_fence) {
+  return unsupported(__func__, buffer, acquire_fence);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerColor(hwc_color_t color) {
+  return unsupported(__func__, color);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerCompositionType(int32_t type) {
+  return unsupported(__func__, type);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerDataspace(int32_t dataspace) {
+  return unsupported(__func__, dataspace);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerDisplayFrame(hwc_rect_t frame) {
+  return unsupported(__func__, frame);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerPlaneAlpha(float alpha) {
+  return unsupported(__func__, alpha);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerSidebandStream(
+    const native_handle_t *stream) {
+  return unsupported(__func__, stream);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerSourceCrop(hwc_frect_t crop) {
+  return unsupported(__func__, crop);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerSurfaceDamage(hwc_region_t damage) {
+  return unsupported(__func__, damage);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerTransform(int32_t transform) {
+  return unsupported(__func__, transform);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerVisibleRegion(hwc_region_t visible) {
+  return unsupported(__func__, visible);
+}
+
+HWC2::Error DrmHwcTwo::HwcLayer::SetLayerZOrder(uint32_t z) {
+  return unsupported(__func__, z);
+}
+
+// static
+int DrmHwcTwo::HookDevClose(hw_device_t * /*dev*/) {
+  unsupported(__func__);
+  return 0;
+}
+
+// static
+void DrmHwcTwo::HookDevGetCapabilities(hwc2_device_t * /*dev*/,
+                                        uint32_t *out_count,
+                                        int32_t * /*out_capabilities*/) {
+  unsupported(__func__);
+  *out_count = 0;
+}
+
+// static
+hwc2_function_pointer_t DrmHwcTwo::HookDevGetFunction(struct hwc2_device *dev,
+                                                       int32_t descriptor) {
+  DrmHwcTwo *hwc = toDrmHwcTwo(dev);
+  HWC2::FunctionDescriptor func = (HWC2::FunctionDescriptor)descriptor;
+
+  switch (func) {
+    // Device functions
+    case HWC2::FunctionDescriptor::CreateVirtualDisplay:
+      return ToHook<HWC2_PFN_CREATE_VIRTUAL_DISPLAY>(
+          DeviceHook<int32_t, decltype(&DrmHwcTwo::CreateVirtualDisplay),
+                     &DrmHwcTwo::CreateVirtualDisplay, uint32_t, uint32_t,
+                     int32_t*, hwc2_display_t *>);
+    case HWC2::FunctionDescriptor::DestroyVirtualDisplay:
+      return ToHook<HWC2_PFN_DESTROY_VIRTUAL_DISPLAY>(
+          DeviceHook<int32_t, decltype(&DrmHwcTwo::DestroyVirtualDisplay),
+                     &DrmHwcTwo::DestroyVirtualDisplay, hwc2_display_t>);
+    case HWC2::FunctionDescriptor::Dump:
+      return ToHook<HWC2_PFN_DUMP>(
+          DeviceHook<void, decltype(&DrmHwcTwo::Dump), &DrmHwcTwo::Dump,
+                     uint32_t *, char *>);
+    case HWC2::FunctionDescriptor::GetMaxVirtualDisplayCount:
+      return ToHook<HWC2_PFN_GET_MAX_VIRTUAL_DISPLAY_COUNT>(
+          DeviceHook<uint32_t, decltype(&DrmHwcTwo::GetMaxVirtualDisplayCount),
+                     &DrmHwcTwo::GetMaxVirtualDisplayCount>);
+    case HWC2::FunctionDescriptor::RegisterCallback:
+      return ToHook<HWC2_PFN_REGISTER_CALLBACK>(
+          DeviceHook<int32_t, decltype(&DrmHwcTwo::RegisterCallback),
+                     &DrmHwcTwo::RegisterCallback, int32_t,
+                     hwc2_callback_data_t, hwc2_function_pointer_t>);
+
+    // Display functions
+    case HWC2::FunctionDescriptor::AcceptDisplayChanges:
+      return ToHook<HWC2_PFN_ACCEPT_DISPLAY_CHANGES>(
+          DisplayHook<decltype(&HwcDisplay::AcceptDisplayChanges),
+                      &HwcDisplay::AcceptDisplayChanges>);
+    case HWC2::FunctionDescriptor::CreateLayer:
+      return ToHook<HWC2_PFN_CREATE_LAYER>(
+          DisplayHook<decltype(&HwcDisplay::CreateLayer),
+                      &HwcDisplay::CreateLayer, hwc2_layer_t *>);
+    case HWC2::FunctionDescriptor::DestroyLayer:
+      return ToHook<HWC2_PFN_DESTROY_LAYER>(
+          DisplayHook<decltype(&HwcDisplay::DestroyLayer),
+                      &HwcDisplay::DestroyLayer, hwc2_layer_t>);
+    case HWC2::FunctionDescriptor::GetActiveConfig:
+      return ToHook<HWC2_PFN_GET_ACTIVE_CONFIG>(
+          DisplayHook<decltype(&HwcDisplay::GetActiveConfig),
+                      &HwcDisplay::GetActiveConfig, hwc2_config_t *>);
+    case HWC2::FunctionDescriptor::GetChangedCompositionTypes:
+      return ToHook<HWC2_PFN_GET_CHANGED_COMPOSITION_TYPES>(
+          DisplayHook<decltype(&HwcDisplay::GetChangedCompositionTypes),
+                      &HwcDisplay::GetChangedCompositionTypes, uint32_t *,
+                      hwc2_layer_t *, int32_t *>);
+    case HWC2::FunctionDescriptor::GetClientTargetSupport:
+      return ToHook<HWC2_PFN_GET_CLIENT_TARGET_SUPPORT>(
+          DisplayHook<decltype(&HwcDisplay::GetClientTargetSupport),
+                      &HwcDisplay::GetClientTargetSupport, uint32_t, uint32_t,
+                      int32_t, int32_t>);
+    case HWC2::FunctionDescriptor::GetColorModes:
+      return ToHook<HWC2_PFN_GET_COLOR_MODES>(
+          DisplayHook<decltype(&HwcDisplay::GetColorModes),
+                      &HwcDisplay::GetColorModes, uint32_t *, int32_t *>);
+    case HWC2::FunctionDescriptor::GetDisplayAttribute:
+      return ToHook<HWC2_PFN_GET_DISPLAY_ATTRIBUTE>(DisplayHook<
+          decltype(&HwcDisplay::GetDisplayAttribute),
+          &HwcDisplay::GetDisplayAttribute, hwc2_config_t, int32_t, int32_t *>);
+    case HWC2::FunctionDescriptor::GetDisplayConfigs:
+      return ToHook<HWC2_PFN_GET_DISPLAY_CONFIGS>(DisplayHook<
+          decltype(&HwcDisplay::GetDisplayConfigs),
+          &HwcDisplay::GetDisplayConfigs, uint32_t *, hwc2_config_t *>);
+    case HWC2::FunctionDescriptor::GetDisplayName:
+      return ToHook<HWC2_PFN_GET_DISPLAY_NAME>(
+          DisplayHook<decltype(&HwcDisplay::GetDisplayName),
+                      &HwcDisplay::GetDisplayName, uint32_t *, char *>);
+    case HWC2::FunctionDescriptor::GetDisplayRequests:
+      return ToHook<HWC2_PFN_GET_DISPLAY_REQUESTS>(
+          DisplayHook<decltype(&HwcDisplay::GetDisplayRequests),
+                      &HwcDisplay::GetDisplayRequests, int32_t *, uint32_t *,
+                      hwc2_layer_t *, int32_t *>);
+    case HWC2::FunctionDescriptor::GetDisplayType:
+      return ToHook<HWC2_PFN_GET_DISPLAY_TYPE>(
+          DisplayHook<decltype(&HwcDisplay::GetDisplayType),
+                      &HwcDisplay::GetDisplayType, int32_t *>);
+    case HWC2::FunctionDescriptor::GetDozeSupport:
+      return ToHook<HWC2_PFN_GET_DOZE_SUPPORT>(
+          DisplayHook<decltype(&HwcDisplay::GetDozeSupport),
+                      &HwcDisplay::GetDozeSupport, int32_t *>);
+    case HWC2::FunctionDescriptor::GetReleaseFences:
+      return ToHook<HWC2_PFN_GET_RELEASE_FENCES>(
+          DisplayHook<decltype(&HwcDisplay::GetReleaseFences),
+                      &HwcDisplay::GetReleaseFences, uint32_t *, hwc2_layer_t *,
+                      int32_t *>);
+    case HWC2::FunctionDescriptor::PresentDisplay:
+      return ToHook<HWC2_PFN_PRESENT_DISPLAY>(
+          DisplayHook<decltype(&HwcDisplay::PresentDisplay),
+                      &HwcDisplay::PresentDisplay, int32_t *>);
+    case HWC2::FunctionDescriptor::SetActiveConfig:
+      return ToHook<HWC2_PFN_SET_ACTIVE_CONFIG>(
+          DisplayHook<decltype(&HwcDisplay::SetActiveConfig),
+                      &HwcDisplay::SetActiveConfig, hwc2_config_t>);
+    case HWC2::FunctionDescriptor::SetClientTarget:
+      return ToHook<HWC2_PFN_SET_CLIENT_TARGET>(DisplayHook<
+          decltype(&HwcDisplay::SetClientTarget), &HwcDisplay::SetClientTarget,
+          buffer_handle_t, int32_t, int32_t, hwc_region_t>);
+    case HWC2::FunctionDescriptor::SetColorMode:
+      return ToHook<HWC2_PFN_SET_COLOR_MODE>(
+          DisplayHook<decltype(&HwcDisplay::SetColorMode),
+                      &HwcDisplay::SetColorMode, int32_t>);
+    case HWC2::FunctionDescriptor::SetColorTransform:
+      return ToHook<HWC2_PFN_SET_COLOR_TRANSFORM>(
+          DisplayHook<decltype(&HwcDisplay::SetColorTransform),
+                      &HwcDisplay::SetColorTransform, const float *, int32_t>);
+    case HWC2::FunctionDescriptor::SetOutputBuffer:
+      return ToHook<HWC2_PFN_SET_OUTPUT_BUFFER>(
+          DisplayHook<decltype(&HwcDisplay::SetOutputBuffer),
+                      &HwcDisplay::SetOutputBuffer, buffer_handle_t, int32_t>);
+    case HWC2::FunctionDescriptor::SetPowerMode:
+      return ToHook<HWC2_PFN_SET_POWER_MODE>(
+          DisplayHook<decltype(&HwcDisplay::SetPowerMode),
+                      &HwcDisplay::SetPowerMode, int32_t>);
+    case HWC2::FunctionDescriptor::SetVsyncEnabled:
+      return ToHook<HWC2_PFN_SET_VSYNC_ENABLED>(
+          DisplayHook<decltype(&HwcDisplay::SetVsyncEnabled),
+                      &HwcDisplay::SetVsyncEnabled, int32_t>);
+    case HWC2::FunctionDescriptor::ValidateDisplay:
+      return ToHook<HWC2_PFN_VALIDATE_DISPLAY>(
+          DisplayHook<decltype(&HwcDisplay::ValidateDisplay),
+                      &HwcDisplay::ValidateDisplay, uint32_t *, uint32_t *>);
+
+    // Layer functions
+    case HWC2::FunctionDescriptor::SetCursorPosition:
+      return ToHook<HWC2_PFN_SET_CURSOR_POSITION>(
+          LayerHook<decltype(&HwcLayer::SetCursorPosition),
+                    &HwcLayer::SetCursorPosition, int32_t, int32_t>);
+    case HWC2::FunctionDescriptor::SetLayerBlendMode:
+      return ToHook<HWC2_PFN_SET_LAYER_BLEND_MODE>(
+          LayerHook<decltype(&HwcLayer::SetLayerBlendMode),
+                    &HwcLayer::SetLayerBlendMode, int32_t>);
+    case HWC2::FunctionDescriptor::SetLayerBuffer:
+      return ToHook<HWC2_PFN_SET_LAYER_BUFFER>(
+          LayerHook<decltype(&HwcLayer::SetLayerBuffer),
+                    &HwcLayer::SetLayerBuffer, buffer_handle_t, int32_t>);
+    case HWC2::FunctionDescriptor::SetLayerColor:
+      return ToHook<HWC2_PFN_SET_LAYER_COLOR>(
+          LayerHook<decltype(&HwcLayer::SetLayerColor),
+                    &HwcLayer::SetLayerColor, hwc_color_t>);
+    case HWC2::FunctionDescriptor::SetLayerCompositionType:
+      return ToHook<HWC2_PFN_SET_LAYER_COMPOSITION_TYPE>(
+          LayerHook<decltype(&HwcLayer::SetLayerCompositionType),
+                    &HwcLayer::SetLayerCompositionType, int32_t>);
+    case HWC2::FunctionDescriptor::SetLayerDataspace:
+      return ToHook<HWC2_PFN_SET_LAYER_DATASPACE>(
+          LayerHook<decltype(&HwcLayer::SetLayerDataspace),
+                    &HwcLayer::SetLayerDataspace, int32_t>);
+    case HWC2::FunctionDescriptor::SetLayerDisplayFrame:
+      return ToHook<HWC2_PFN_SET_LAYER_DISPLAY_FRAME>(
+          LayerHook<decltype(&HwcLayer::SetLayerDisplayFrame),
+                    &HwcLayer::SetLayerDisplayFrame, hwc_rect_t>);
+    case HWC2::FunctionDescriptor::SetLayerPlaneAlpha:
+      return ToHook<HWC2_PFN_SET_LAYER_PLANE_ALPHA>(
+          LayerHook<decltype(&HwcLayer::SetLayerPlaneAlpha),
+                    &HwcLayer::SetLayerPlaneAlpha, float>);
+    case HWC2::FunctionDescriptor::SetLayerSidebandStream:
+      return ToHook<HWC2_PFN_SET_LAYER_SIDEBAND_STREAM>(LayerHook<
+          decltype(&HwcLayer::SetLayerSidebandStream),
+          &HwcLayer::SetLayerSidebandStream, const native_handle_t *>);
+    case HWC2::FunctionDescriptor::SetLayerSourceCrop:
+      return ToHook<HWC2_PFN_SET_LAYER_SOURCE_CROP>(
+          LayerHook<decltype(&HwcLayer::SetLayerSourceCrop),
+                    &HwcLayer::SetLayerSourceCrop, hwc_frect_t>);
+    case HWC2::FunctionDescriptor::SetLayerSurfaceDamage:
+      return ToHook<HWC2_PFN_SET_LAYER_SURFACE_DAMAGE>(
+          LayerHook<decltype(&HwcLayer::SetLayerSurfaceDamage),
+                    &HwcLayer::SetLayerSurfaceDamage, hwc_region_t>);
+    case HWC2::FunctionDescriptor::SetLayerTransform:
+      return ToHook<HWC2_PFN_SET_LAYER_TRANSFORM>(
+          LayerHook<decltype(&HwcLayer::SetLayerTransform),
+                    &HwcLayer::SetLayerTransform, int32_t>);
+    case HWC2::FunctionDescriptor::SetLayerVisibleRegion:
+      return ToHook<HWC2_PFN_SET_LAYER_VISIBLE_REGION>(
+          LayerHook<decltype(&HwcLayer::SetLayerVisibleRegion),
+                    &HwcLayer::SetLayerVisibleRegion, hwc_region_t>);
+    case HWC2::FunctionDescriptor::SetLayerZOrder:
+      return ToHook<HWC2_PFN_SET_LAYER_Z_ORDER>(
+          LayerHook<decltype(&HwcLayer::SetLayerZOrder),
+                    &HwcLayer::SetLayerZOrder, uint32_t>);
+    default:
+      return NULL;
+  }
+}
+}
diff --git a/drmhwctwo.h b/drmhwctwo.h
new file mode 100644
index 0000000..8bc5ce9
--- /dev/null
+++ b/drmhwctwo.h
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2016 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 <hardware/hwcomposer2.h>
+
+#include <map>
+
+namespace android {
+
+class DrmHwcTwo : public hwc2_device_t {
+ public:
+  DrmHwcTwo();
+
+ private:
+  class HwcLayer {
+   public:
+    HWC2::Error SetCursorPosition(int32_t x, int32_t y);
+    HWC2::Error SetLayerBlendMode(int32_t mode);
+    HWC2::Error SetLayerBuffer(buffer_handle_t buffer, int32_t acquire_fence);
+    HWC2::Error SetLayerColor(hwc_color_t color);
+    HWC2::Error SetLayerCompositionType(int32_t type);
+    HWC2::Error SetLayerDataspace(int32_t dataspace);
+    HWC2::Error SetLayerDisplayFrame(hwc_rect_t frame);
+    HWC2::Error SetLayerPlaneAlpha(float alpha);
+    HWC2::Error SetLayerSidebandStream(const native_handle_t *stream);
+    HWC2::Error SetLayerSourceCrop(hwc_frect_t crop);
+    HWC2::Error SetLayerSurfaceDamage(hwc_region_t damage);
+    HWC2::Error SetLayerTransform(int32_t transform);
+    HWC2::Error SetLayerVisibleRegion(hwc_region_t visible);
+    HWC2::Error SetLayerZOrder(uint32_t z);
+  };
+
+  class HwcDisplay {
+   public:
+    // HWC Hooks
+    HWC2::Error AcceptDisplayChanges();
+    HWC2::Error CreateLayer(hwc2_layer_t *layer);
+    HWC2::Error DestroyLayer(hwc2_layer_t layer);
+    HWC2::Error GetActiveConfig(hwc2_config_t *config);
+    HWC2::Error GetChangedCompositionTypes(uint32_t *num_elements,
+                                           hwc2_layer_t *layers,
+                                           int32_t *types);
+    HWC2::Error GetClientTargetSupport(uint32_t width, uint32_t height,
+                                       int32_t format, int32_t dataspace);
+    HWC2::Error GetColorModes(uint32_t *num_modes, int32_t *modes);
+    HWC2::Error GetDisplayAttribute(hwc2_config_t config, int32_t attribute,
+                                    int32_t *value);
+    HWC2::Error GetDisplayConfigs(uint32_t *num_configs,
+                                  hwc2_config_t *configs);
+    HWC2::Error GetDisplayName(uint32_t *size, char *name);
+    HWC2::Error GetDisplayRequests(int32_t *display_requests,
+                                   uint32_t *num_elements, hwc2_layer_t *layers,
+                                   int32_t *layer_requests);
+    HWC2::Error GetDisplayType(int32_t *type);
+    HWC2::Error GetDozeSupport(int32_t *support);
+    HWC2::Error GetReleaseFences(uint32_t *num_elements, hwc2_layer_t *layers,
+                                 int32_t *fences);
+    HWC2::Error PresentDisplay(int32_t *retire_fence);
+    HWC2::Error SetActiveConfig(hwc2_config_t config);
+    HWC2::Error SetClientTarget(buffer_handle_t target, int32_t acquire_fence,
+                                int32_t dataspace, hwc_region_t damage);
+    HWC2::Error SetColorMode(int32_t mode);
+    HWC2::Error SetColorTransform(const float *matrix, int32_t hint);
+    HWC2::Error SetOutputBuffer(buffer_handle_t buffer, int32_t release_fence);
+    HWC2::Error SetPowerMode(int32_t mode);
+    HWC2::Error SetVsyncEnabled(int32_t enabled);
+    HWC2::Error ValidateDisplay(uint32_t *num_types, uint32_t *num_requests);
+    HwcLayer &get_layer(hwc2_layer_t layer) {
+      return layers_.at(layer);
+    }
+
+   private:
+    std::map<hwc2_layer_t, HwcLayer> layers_;
+  };
+
+  static DrmHwcTwo *toDrmHwcTwo(hwc2_device_t *dev) {
+    return static_cast<DrmHwcTwo *>(dev);
+  }
+
+  template <typename PFN, typename T>
+  static hwc2_function_pointer_t ToHook(T function) {
+    static_assert(std::is_same<PFN, T>::value, "Incompatible fn pointer");
+    return reinterpret_cast<hwc2_function_pointer_t>(function);
+  }
+
+  template <typename T, typename HookType, HookType func, typename... Args>
+  static T DeviceHook(hwc2_device_t *dev, Args... args) {
+    DrmHwcTwo *hwc = toDrmHwcTwo(dev);
+    return static_cast<T>(((*hwc).*func)(std::forward<Args>(args)...));
+  }
+
+  template <typename HookType, HookType func, typename... Args>
+  static int32_t DisplayHook(hwc2_device_t *dev, hwc2_display_t display_handle,
+                             Args... args) {
+    DrmHwcTwo *hwc = toDrmHwcTwo(dev);
+    HwcDisplay &display = hwc->displays_.at(display_handle);
+    return static_cast<int32_t>((display.*func)(std::forward<Args>(args)...));
+  }
+
+  template <typename HookType, HookType func, typename... Args>
+  static int32_t LayerHook(hwc2_device_t *dev, hwc2_display_t display_handle,
+                           hwc2_layer_t layer_handle, Args... args) {
+    DrmHwcTwo *hwc = toDrmHwcTwo(dev);
+    HwcDisplay &display = hwc->displays_.at(display_handle);
+    HwcLayer &layer = display.get_layer(layer_handle);
+    return static_cast<int32_t>((layer.*func)(std::forward<Args>(args)...));
+  }
+
+  // hwc2_device_t hooks
+  static int HookDevClose(hw_device_t *dev);
+  static void HookDevGetCapabilities(hwc2_device_t *dev, uint32_t *out_count,
+                                     int32_t *out_capabilities);
+  static hwc2_function_pointer_t HookDevGetFunction(struct hwc2_device *device,
+                                                    int32_t descriptor);
+
+  // Device functions
+  HWC2::Error CreateVirtualDisplay(uint32_t width, uint32_t height,
+                                   int32_t *format,
+                                   hwc2_display_t *display);
+  HWC2::Error DestroyVirtualDisplay(hwc2_display_t display);
+  void Dump(uint32_t *size, char *buffer);
+  uint32_t GetMaxVirtualDisplayCount();
+  HWC2::Error RegisterCallback(int32_t descriptor, hwc2_callback_data_t data,
+                               hwc2_function_pointer_t function);
+
+  std::map<hwc2_display_t, HwcDisplay> displays_;
+};
+}