cros_gralloc/gralloc0/gralloc0.cc - platform/external/minigbm - Gitiles

 /*
  * Copyright 2016 The Chromium OS 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 "../cros_gralloc_driver.h"

 #include <hardware/gralloc.h>
 #include <memory.h>

 struct gralloc0_module {
 	gralloc_module_t base;
 	std::unique_ptr<alloc_device_t> alloc;
 	std::unique_ptr<cros_gralloc_driver> driver;
 };

 /* This enumeration must match the one in <gralloc_drm.h>.
  * The functions supported by this gralloc's temporary private API are listed
  * below. Use of these functions is highly discouraged and should only be
  * reserved for cases where no alternative to get same information (such as
  * querying ANativeWindow) exists.
  */
 // clang-format off
 enum {
 	GRALLOC_DRM_GET_STRIDE,
 	GRALLOC_DRM_GET_FORMAT,
 	GRALLOC_DRM_GET_DIMENSIONS,
 	GRALLOC_DRM_GET_BACKING_STORE,
 };
 // clang-format on

 static int64_t gralloc0_convert_flags(int flags)
 {
 	uint64_t usage = BO_USE_NONE;

 	if (flags & GRALLOC_USAGE_CURSOR)
 		usage |= BO_USE_NONE;
 	if ((flags & GRALLOC_USAGE_SW_READ_MASK) == GRALLOC_USAGE_SW_READ_RARELY)
 		usage |= BO_USE_SW_READ_RARELY;
 	if ((flags & GRALLOC_USAGE_SW_READ_MASK) == GRALLOC_USAGE_SW_READ_OFTEN)
 		usage |= BO_USE_SW_READ_OFTEN;
 	if ((flags & GRALLOC_USAGE_SW_WRITE_MASK) == GRALLOC_USAGE_SW_WRITE_RARELY)
 		usage |= BO_USE_SW_WRITE_RARELY;
 	if ((flags & GRALLOC_USAGE_SW_WRITE_MASK) == GRALLOC_USAGE_SW_WRITE_OFTEN)
 		usage |= BO_USE_SW_WRITE_OFTEN;
 	if (flags & GRALLOC_USAGE_HW_TEXTURE)
 		usage |= BO_USE_TEXTURE;
 	if (flags & GRALLOC_USAGE_HW_RENDER)
 		usage |= BO_USE_RENDERING;
 	if (flags & GRALLOC_USAGE_HW_2D)
 		usage |= BO_USE_RENDERING;
 	if (flags & GRALLOC_USAGE_HW_COMPOSER)
 		/* HWC wants to use display hardware, but can defer to OpenGL. */
 		usage |= BO_USE_SCANOUT | BO_USE_TEXTURE;
 	if (flags & GRALLOC_USAGE_HW_FB)
 		usage |= BO_USE_NONE;
 	if (flags & GRALLOC_USAGE_EXTERNAL_DISP)
 		/*
 		 * This flag potentially covers external display for the normal drivers (i915,
 		 * rockchip) and usb monitors (evdi/udl). It's complicated so ignore it.
 		 * */
 		usage |= BO_USE_NONE;
 	if (flags & GRALLOC_USAGE_PROTECTED)
 		usage |= BO_USE_PROTECTED;
 	if (flags & GRALLOC_USAGE_HW_VIDEO_ENCODER)
 		/*HACK: See b/30054495 */
 		usage |= BO_USE_SW_READ_OFTEN;
 	if (flags & GRALLOC_USAGE_HW_CAMERA_WRITE)
 		usage |= BO_USE_HW_CAMERA_WRITE;
 	if (flags & GRALLOC_USAGE_HW_CAMERA_READ)
 		usage |= BO_USE_HW_CAMERA_READ;
 	if (flags & GRALLOC_USAGE_RENDERSCRIPT)
 		/* We use CPU for compute. */
 		usage |= BO_USE_LINEAR;

 	return usage;
 }

 static int gralloc0_alloc(alloc_device_t *dev, int w, int h, int format, int usage,
 			  buffer_handle_t *handle, int *stride)
 {
 	int32_t ret;
 	bool supported;
 	struct cros_gralloc_buffer_descriptor descriptor;
 	auto mod = (struct gralloc0_module *)dev->common.module;

 	descriptor.width = w;
 	descriptor.height = h;
 	descriptor.droid_format = format;
 	descriptor.producer_usage = descriptor.consumer_usage = usage;
 	descriptor.drm_format = cros_gralloc_convert_format(format);
 	descriptor.drv_usage = gralloc0_convert_flags(usage);

 	supported = mod->driver->is_supported(&descriptor);
 	if (!supported && (usage & GRALLOC_USAGE_HW_COMPOSER)) {
 		descriptor.drv_usage &= ~BO_USE_SCANOUT;
 		supported = mod->driver->is_supported(&descriptor);
 	}

 	if (!supported) {
 		cros_gralloc_error("Unsupported combination -- HAL format: %u, HAL flags: %u, "
 				   "drv_format: %4.4s, drv_flags: %llu",
 				   format, usage, reinterpret_cast<char *>(descriptor.drm_format),
 				   static_cast<unsigned long long>(descriptor.drv_usage));
 		return CROS_GRALLOC_ERROR_UNSUPPORTED;
 	}

 	ret = mod->driver->allocate(&descriptor, handle);
 	if (ret)
 		return ret;

 	auto hnd = cros_gralloc_convert_handle(*handle);
 	*stride = hnd->pixel_stride;

 	return CROS_GRALLOC_ERROR_NONE;
 }

 static int gralloc0_free(alloc_device_t *dev, buffer_handle_t handle)
 {
 	auto mod = (struct gralloc0_module *)dev->common.module;
 	return mod->driver->release(handle);
 }

 static int gralloc0_close(struct hw_device_t *dev)
 {
 	/* Memory is freed by managed pointers on process close. */
 	return CROS_GRALLOC_ERROR_NONE;
 }

 static int gralloc0_open(const struct hw_module_t *mod, const char *name, struct hw_device_t **dev)
 {
 	auto module = (struct gralloc0_module *)mod;

 	if (module->alloc) {
 		*dev = &module->alloc->common;
 		return CROS_GRALLOC_ERROR_NONE;
 	}

 	if (strcmp(name, GRALLOC_HARDWARE_GPU0)) {
 		cros_gralloc_error("Incorrect device name - %s.", name);
 		return CROS_GRALLOC_ERROR_UNSUPPORTED;
 	}

 	module->driver = std::make_unique<cros_gralloc_driver>();
 	if (module->driver->init()) {
 		cros_gralloc_error("Failed to initialize driver.");
 		return CROS_GRALLOC_ERROR_NO_RESOURCES;
 	}

 	module->alloc = std::make_unique<alloc_device_t>();

 	module->alloc->alloc = gralloc0_alloc;
 	module->alloc->free = gralloc0_free;
 	module->alloc->common.tag = HARDWARE_DEVICE_TAG;
 	module->alloc->common.version = 0;
 	module->alloc->common.module = (hw_module_t *)mod;
 	module->alloc->common.close = gralloc0_close;

 	*dev = &module->alloc->common;
 	return CROS_GRALLOC_ERROR_NONE;
 }

 static int gralloc0_register_buffer(struct gralloc_module_t const *module, buffer_handle_t handle)
 {
 	auto mod = (struct gralloc0_module *)module;

 	if (!mod->driver) {
 		mod->driver = std::make_unique<cros_gralloc_driver>();
 		if (mod->driver->init()) {
 			cros_gralloc_error("Failed to initialize driver.");
 			return CROS_GRALLOC_ERROR_NO_RESOURCES;
 		}
 	}

 	return mod->driver->retain(handle);
 }

 static int gralloc0_unregister_buffer(struct gralloc_module_t const *module, buffer_handle_t handle)
 {
 	auto mod = (struct gralloc0_module *)module;
 	return mod->driver->release(handle);
 }

 static int gralloc0_lock(struct gralloc_module_t const *module, buffer_handle_t handle, int usage,
 			 int l, int t, int w, int h, void **vaddr)
 {
 	int32_t ret, fence;
 	uint64_t flags;
 	uint8_t *addr[DRV_MAX_PLANES];
 	auto mod = (struct gralloc0_module *)module;

 	auto hnd = cros_gralloc_convert_handle(handle);
 	if (!hnd) {
 		cros_gralloc_error("Invalid handle.");
 		return CROS_GRALLOC_ERROR_BAD_HANDLE;
 	}

 	if ((hnd->droid_format == HAL_PIXEL_FORMAT_YCbCr_420_888)) {
 		cros_gralloc_error("HAL_PIXEL_FORMAT_YCbCr_*_888 format not compatible.");
 		return CROS_GRALLOC_ERROR_BAD_HANDLE;
 	}

 	fence = -1;
 	flags = gralloc0_convert_flags(usage);
 	ret = mod->driver->lock(handle, fence, flags, addr);
 	*vaddr = addr[0];
 	return ret;
 }

 static int gralloc0_unlock(struct gralloc_module_t const *module, buffer_handle_t handle)
 {
 	auto mod = (struct gralloc0_module *)module;
 	return mod->driver->unlock(handle);
 }

 static int gralloc0_perform(struct gralloc_module_t const *module, int op, ...)
 {
 	va_list args;
 	int32_t *out_format, ret;
 	uint64_t *out_store;
 	buffer_handle_t handle;
 	uint32_t *out_width, *out_height, *out_stride;
 	auto mod = (struct gralloc0_module *)module;

 	switch (op) {
 	case GRALLOC_DRM_GET_STRIDE:
 	case GRALLOC_DRM_GET_FORMAT:
 	case GRALLOC_DRM_GET_DIMENSIONS:
 	case GRALLOC_DRM_GET_BACKING_STORE:
 		break;
 	default:
 		return CROS_GRALLOC_ERROR_UNSUPPORTED;
 	}

 	va_start(args, op);

 	ret = CROS_GRALLOC_ERROR_NONE;
 	handle = va_arg(args, buffer_handle_t);
 	auto hnd = cros_gralloc_convert_handle(handle);
 	if (!hnd) {
 		cros_gralloc_error("Invalid handle.");
 		return CROS_GRALLOC_ERROR_BAD_HANDLE;
 	}

 	switch (op) {
 	case GRALLOC_DRM_GET_STRIDE:
 		out_stride = va_arg(args, uint32_t *);
 		*out_stride = hnd->pixel_stride;
 		break;
 	case GRALLOC_DRM_GET_FORMAT:
 		out_format = va_arg(args, int32_t *);
 		*out_format = hnd->droid_format;
 		break;
 	case GRALLOC_DRM_GET_DIMENSIONS:
 		out_width = va_arg(args, uint32_t *);
 		out_height = va_arg(args, uint32_t *);
 		*out_width = hnd->width;
 		*out_height = hnd->height;
 		break;
 	case GRALLOC_DRM_GET_BACKING_STORE:
 		out_store = va_arg(args, uint64_t *);
 		ret = mod->driver->get_backing_store(handle, out_store);
 		break;
 	default:
 		ret = CROS_GRALLOC_ERROR_UNSUPPORTED;
 	}

 	va_end(args);

 	return ret;
 }

 static int gralloc0_lock_ycbcr(struct gralloc_module_t const *module, buffer_handle_t handle,
 			       int usage, int l, int t, int w, int h, struct android_ycbcr *ycbcr)
 {
 	uint64_t flags;
 	int32_t fence, ret;
 	uint8_t *addr[DRV_MAX_PLANES] = { nullptr, nullptr, nullptr, nullptr };
 	auto mod = (struct gralloc0_module *)module;

 	auto hnd = cros_gralloc_convert_handle(handle);
 	if (!hnd) {
 		cros_gralloc_error("Invalid handle.");
 		return CROS_GRALLOC_ERROR_BAD_HANDLE;
 	}

 	if ((hnd->droid_format != HAL_PIXEL_FORMAT_YCbCr_420_888) &&
 	    (hnd->droid_format != HAL_PIXEL_FORMAT_YV12) &&
 	    (hnd->droid_format != HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED)) {
 		cros_gralloc_error("Non-YUV format not compatible.");
 		return CROS_GRALLOC_ERROR_BAD_HANDLE;
 	}

 	fence = -1;
 	flags = gralloc0_convert_flags(usage);
 	ret = mod->driver->lock(handle, fence, flags, addr);
 	if (ret)
 		return ret;

 	switch (hnd->format) {
 	case DRM_FORMAT_NV12:
 		ycbcr->y = addr[0];
 		ycbcr->cb = addr[1];
 		ycbcr->cr = addr[1] + 1;
 		ycbcr->ystride = hnd->strides[0];
 		ycbcr->cstride = hnd->strides[1];
 		ycbcr->chroma_step = 2;
 		break;
 	case DRM_FORMAT_YVU420:
 	case DRM_FORMAT_YVU420_ANDROID:
 		ycbcr->y = addr[0];
 		ycbcr->cb = addr[2];
 		ycbcr->cr = addr[1];
 		ycbcr->ystride = hnd->strides[0];
 		ycbcr->cstride = hnd->strides[1];
 		ycbcr->chroma_step = 1;
 		break;
 	default:
 		mod->driver->unlock(handle);
 		return CROS_GRALLOC_ERROR_UNSUPPORTED;
 	}

 	return ret;
 }

 static struct hw_module_methods_t gralloc0_module_methods = {.open = gralloc0_open };

 struct gralloc0_module HAL_MODULE_INFO_SYM = {
 	.base =
 	    {
 		.common =
 		    {
 			.tag = HARDWARE_MODULE_TAG,
 			.module_api_version = GRALLOC_MODULE_API_VERSION_0_2,
 			.hal_api_version = 0,
 			.id = GRALLOC_HARDWARE_MODULE_ID,
 			.name = "CrOS Gralloc",
 			.author = "Chrome OS",
 			.methods = &gralloc0_module_methods,
 		    },

 		.registerBuffer = gralloc0_register_buffer,
 		.unregisterBuffer = gralloc0_unregister_buffer,
 		.lock = gralloc0_lock,
 		.unlock = gralloc0_unlock,
 		.perform = gralloc0_perform,
 		.lock_ycbcr = gralloc0_lock_ycbcr,
 	    },

 	.alloc = nullptr,
 	.driver = nullptr,
 };
	/*
	* Copyright 2016 The Chromium OS 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 "../cros_gralloc_driver.h"

	#include <hardware/gralloc.h>
	#include <memory.h>

	struct gralloc0_module {
	gralloc_module_t base;
	std::unique_ptr<alloc_device_t> alloc;
	std::unique_ptr<cros_gralloc_driver> driver;
	};

	/* This enumeration must match the one in <gralloc_drm.h>.
	* The functions supported by this gralloc's temporary private API are listed
	* below. Use of these functions is highly discouraged and should only be
	* reserved for cases where no alternative to get same information (such as
	* querying ANativeWindow) exists.
	*/
	// clang-format off
	enum {
	GRALLOC_DRM_GET_STRIDE,
	GRALLOC_DRM_GET_FORMAT,
	GRALLOC_DRM_GET_DIMENSIONS,
	GRALLOC_DRM_GET_BACKING_STORE,
	};
	// clang-format on

	static int64_t gralloc0_convert_flags(int flags)
	{
	uint64_t usage = BO_USE_NONE;

	if (flags & GRALLOC_USAGE_CURSOR)
	usage \|= BO_USE_NONE;
	if ((flags & GRALLOC_USAGE_SW_READ_MASK) == GRALLOC_USAGE_SW_READ_RARELY)
	usage \|= BO_USE_SW_READ_RARELY;
	if ((flags & GRALLOC_USAGE_SW_READ_MASK) == GRALLOC_USAGE_SW_READ_OFTEN)
	usage \|= BO_USE_SW_READ_OFTEN;
	if ((flags & GRALLOC_USAGE_SW_WRITE_MASK) == GRALLOC_USAGE_SW_WRITE_RARELY)
	usage \|= BO_USE_SW_WRITE_RARELY;
	if ((flags & GRALLOC_USAGE_SW_WRITE_MASK) == GRALLOC_USAGE_SW_WRITE_OFTEN)
	usage \|= BO_USE_SW_WRITE_OFTEN;
	if (flags & GRALLOC_USAGE_HW_TEXTURE)
	usage \|= BO_USE_TEXTURE;
	if (flags & GRALLOC_USAGE_HW_RENDER)
	usage \|= BO_USE_RENDERING;
	if (flags & GRALLOC_USAGE_HW_2D)
	usage \|= BO_USE_RENDERING;
	if (flags & GRALLOC_USAGE_HW_COMPOSER)
	/* HWC wants to use display hardware, but can defer to OpenGL. */
	usage \|= BO_USE_SCANOUT \| BO_USE_TEXTURE;
	if (flags & GRALLOC_USAGE_HW_FB)
	usage \|= BO_USE_NONE;
	if (flags & GRALLOC_USAGE_EXTERNAL_DISP)
	/*
	* This flag potentially covers external display for the normal drivers (i915,
	* rockchip) and usb monitors (evdi/udl). It's complicated so ignore it.
	* */
	usage \|= BO_USE_NONE;
	if (flags & GRALLOC_USAGE_PROTECTED)
	usage \|= BO_USE_PROTECTED;
	if (flags & GRALLOC_USAGE_HW_VIDEO_ENCODER)
	/HACK: See b/30054495 /
	usage \|= BO_USE_SW_READ_OFTEN;
	if (flags & GRALLOC_USAGE_HW_CAMERA_WRITE)
	usage \|= BO_USE_HW_CAMERA_WRITE;
	if (flags & GRALLOC_USAGE_HW_CAMERA_READ)
	usage \|= BO_USE_HW_CAMERA_READ;
	if (flags & GRALLOC_USAGE_RENDERSCRIPT)
	/* We use CPU for compute. */
	usage \|= BO_USE_LINEAR;

	return usage;
	}

	static int gralloc0_alloc(alloc_device_t *dev, int w, int h, int format, int usage,
	buffer_handle_t handle, int stride)
	{
	int32_t ret;
	bool supported;
	struct cros_gralloc_buffer_descriptor descriptor;
	auto mod = (struct gralloc0_module *)dev->common.module;

	descriptor.width = w;
	descriptor.height = h;
	descriptor.droid_format = format;
	descriptor.producer_usage = descriptor.consumer_usage = usage;
	descriptor.drm_format = cros_gralloc_convert_format(format);
	descriptor.drv_usage = gralloc0_convert_flags(usage);

	supported = mod->driver->is_supported(&descriptor);
	if (!supported && (usage & GRALLOC_USAGE_HW_COMPOSER)) {
	descriptor.drv_usage &= ~BO_USE_SCANOUT;
	supported = mod->driver->is_supported(&descriptor);
	}

	if (!supported) {
	cros_gralloc_error("Unsupported combination -- HAL format: %u, HAL flags: %u, "
	"drv_format: %4.4s, drv_flags: %llu",
	format, usage, reinterpret_cast<char *>(descriptor.drm_format),
	static_cast<unsigned long long>(descriptor.drv_usage));
	return CROS_GRALLOC_ERROR_UNSUPPORTED;
	}

	ret = mod->driver->allocate(&descriptor, handle);
	if (ret)
	return ret;

	auto hnd = cros_gralloc_convert_handle(*handle);
	*stride = hnd->pixel_stride;

	return CROS_GRALLOC_ERROR_NONE;
	}

	static int gralloc0_free(alloc_device_t *dev, buffer_handle_t handle)
	{
	auto mod = (struct gralloc0_module *)dev->common.module;
	return mod->driver->release(handle);
	}

	static int gralloc0_close(struct hw_device_t *dev)
	{
	/* Memory is freed by managed pointers on process close. */
	return CROS_GRALLOC_ERROR_NONE;
	}

	static int gralloc0_open(const struct hw_module_t mod, const char name, struct hw_device_t **dev)
	{
	auto module = (struct gralloc0_module *)mod;

	if (module->alloc) {
	*dev = &module->alloc->common;
	return CROS_GRALLOC_ERROR_NONE;
	}

	if (strcmp(name, GRALLOC_HARDWARE_GPU0)) {
	cros_gralloc_error("Incorrect device name - %s.", name);
	return CROS_GRALLOC_ERROR_UNSUPPORTED;
	}

	module->driver = std::make_unique<cros_gralloc_driver>();
	if (module->driver->init()) {
	cros_gralloc_error("Failed to initialize driver.");
	return CROS_GRALLOC_ERROR_NO_RESOURCES;
	}

	module->alloc = std::make_unique<alloc_device_t>();

	module->alloc->alloc = gralloc0_alloc;
	module->alloc->free = gralloc0_free;
	module->alloc->common.tag = HARDWARE_DEVICE_TAG;
	module->alloc->common.version = 0;
	module->alloc->common.module = (hw_module_t *)mod;
	module->alloc->common.close = gralloc0_close;

	*dev = &module->alloc->common;
	return CROS_GRALLOC_ERROR_NONE;
	}

	static int gralloc0_register_buffer(struct gralloc_module_t const *module, buffer_handle_t handle)
	{
	auto mod = (struct gralloc0_module *)module;

	if (!mod->driver) {
	mod->driver = std::make_unique<cros_gralloc_driver>();
	if (mod->driver->init()) {
	cros_gralloc_error("Failed to initialize driver.");
	return CROS_GRALLOC_ERROR_NO_RESOURCES;
	}
	}

	return mod->driver->retain(handle);
	}

	static int gralloc0_unregister_buffer(struct gralloc_module_t const *module, buffer_handle_t handle)
	{
	auto mod = (struct gralloc0_module *)module;
	return mod->driver->release(handle);
	}

	static int gralloc0_lock(struct gralloc_module_t const *module, buffer_handle_t handle, int usage,
	int l, int t, int w, int h, void **vaddr)
	{
	int32_t ret, fence;
	uint64_t flags;
	uint8_t *addr[DRV_MAX_PLANES];
	auto mod = (struct gralloc0_module *)module;

	auto hnd = cros_gralloc_convert_handle(handle);
	if (!hnd) {
	cros_gralloc_error("Invalid handle.");
	return CROS_GRALLOC_ERROR_BAD_HANDLE;
	}

	if ((hnd->droid_format == HAL_PIXEL_FORMAT_YCbCr_420_888)) {
	cros_gralloc_error("HAL_PIXEL_FORMAT_YCbCr_*_888 format not compatible.");
	return CROS_GRALLOC_ERROR_BAD_HANDLE;
	}

	fence = -1;
	flags = gralloc0_convert_flags(usage);
	ret = mod->driver->lock(handle, fence, flags, addr);
	*vaddr = addr[0];
	return ret;
	}

	static int gralloc0_unlock(struct gralloc_module_t const *module, buffer_handle_t handle)
	{
	auto mod = (struct gralloc0_module *)module;
	return mod->driver->unlock(handle);
	}

	static int gralloc0_perform(struct gralloc_module_t const *module, int op, ...)
	{
	va_list args;
	int32_t *out_format, ret;
	uint64_t *out_store;
	buffer_handle_t handle;
	uint32_t out_width, out_height, *out_stride;
	auto mod = (struct gralloc0_module *)module;

	switch (op) {
	case GRALLOC_DRM_GET_STRIDE:
	case GRALLOC_DRM_GET_FORMAT:
	case GRALLOC_DRM_GET_DIMENSIONS:
	case GRALLOC_DRM_GET_BACKING_STORE:
	break;
	default:
	return CROS_GRALLOC_ERROR_UNSUPPORTED;
	}

	va_start(args, op);

	ret = CROS_GRALLOC_ERROR_NONE;
	handle = va_arg(args, buffer_handle_t);
	auto hnd = cros_gralloc_convert_handle(handle);
	if (!hnd) {
	cros_gralloc_error("Invalid handle.");
	return CROS_GRALLOC_ERROR_BAD_HANDLE;
	}

	switch (op) {
	case GRALLOC_DRM_GET_STRIDE:
	out_stride = va_arg(args, uint32_t *);
	*out_stride = hnd->pixel_stride;
	break;
	case GRALLOC_DRM_GET_FORMAT:
	out_format = va_arg(args, int32_t *);
	*out_format = hnd->droid_format;
	break;
	case GRALLOC_DRM_GET_DIMENSIONS:
	out_width = va_arg(args, uint32_t *);
	out_height = va_arg(args, uint32_t *);
	*out_width = hnd->width;
	*out_height = hnd->height;
	break;
	case GRALLOC_DRM_GET_BACKING_STORE:
	out_store = va_arg(args, uint64_t *);
	ret = mod->driver->get_backing_store(handle, out_store);
	break;
	default:
	ret = CROS_GRALLOC_ERROR_UNSUPPORTED;
	}

	va_end(args);

	return ret;
	}

	static int gralloc0_lock_ycbcr(struct gralloc_module_t const *module, buffer_handle_t handle,
	int usage, int l, int t, int w, int h, struct android_ycbcr *ycbcr)
	{
	uint64_t flags;
	int32_t fence, ret;
	uint8_t *addr[DRV_MAX_PLANES] = { nullptr, nullptr, nullptr, nullptr };
	auto mod = (struct gralloc0_module *)module;

	auto hnd = cros_gralloc_convert_handle(handle);
	if (!hnd) {
	cros_gralloc_error("Invalid handle.");
	return CROS_GRALLOC_ERROR_BAD_HANDLE;
	}

	if ((hnd->droid_format != HAL_PIXEL_FORMAT_YCbCr_420_888) &&
	(hnd->droid_format != HAL_PIXEL_FORMAT_YV12) &&
	(hnd->droid_format != HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED)) {
	cros_gralloc_error("Non-YUV format not compatible.");
	return CROS_GRALLOC_ERROR_BAD_HANDLE;
	}

	fence = -1;
	flags = gralloc0_convert_flags(usage);
	ret = mod->driver->lock(handle, fence, flags, addr);
	if (ret)
	return ret;

	switch (hnd->format) {
	case DRM_FORMAT_NV12:
	ycbcr->y = addr[0];
	ycbcr->cb = addr[1];
	ycbcr->cr = addr[1] + 1;
	ycbcr->ystride = hnd->strides[0];
	ycbcr->cstride = hnd->strides[1];
	ycbcr->chroma_step = 2;
	break;
	case DRM_FORMAT_YVU420:
	case DRM_FORMAT_YVU420_ANDROID:
	ycbcr->y = addr[0];
	ycbcr->cb = addr[2];
	ycbcr->cr = addr[1];
	ycbcr->ystride = hnd->strides[0];
	ycbcr->cstride = hnd->strides[1];
	ycbcr->chroma_step = 1;
	break;
	default:
	mod->driver->unlock(handle);
	return CROS_GRALLOC_ERROR_UNSUPPORTED;
	}

	return ret;
	}

	static struct hw_module_methods_t gralloc0_module_methods = {.open = gralloc0_open };

	struct gralloc0_module HAL_MODULE_INFO_SYM = {
	.base =
	{
	.common =
	{
	.tag = HARDWARE_MODULE_TAG,
	.module_api_version = GRALLOC_MODULE_API_VERSION_0_2,
	.hal_api_version = 0,
	.id = GRALLOC_HARDWARE_MODULE_ID,
	.name = "CrOS Gralloc",
	.author = "Chrome OS",
	.methods = &gralloc0_module_methods,
	},

	.registerBuffer = gralloc0_register_buffer,
	.unregisterBuffer = gralloc0_unregister_buffer,
	.lock = gralloc0_lock,
	.unlock = gralloc0_unlock,
	.perform = gralloc0_perform,
	.lock_ycbcr = gralloc0_lock_ycbcr,
	},

	.alloc = nullptr,
	.driver = nullptr,
	};