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/*
* Copyright (C) 2008 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.
*/
#ifndef ANDROID_OVERLAY_INTERFACE_H
#define ANDROID_OVERLAY_INTERFACE_H
#include <cutils/native_handle.h>
#include <hardware/hardware.h>
#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
/**
* The id of this module
*/
#define OVERLAY_HARDWARE_MODULE_ID "overlay"
/**
* Name of the overlay device to open
*/
#define OVERLAY_HARDWARE_CONTROL "control"
#define OVERLAY_HARDWARE_DATA "data"
/*****************************************************************************/
/* possible overlay formats */
enum {
OVERLAY_FORMAT_RGBA_8888 = HAL_PIXEL_FORMAT_RGBA_8888,
OVERLAY_FORMAT_RGB_565 = HAL_PIXEL_FORMAT_RGB_565,
OVERLAY_FORMAT_BGRA_8888 = HAL_PIXEL_FORMAT_BGRA_8888,
OVERLAY_FORMAT_YCbCr_422_I = HAL_PIXEL_FORMAT_YCbCr_422_I,
OVERLAY_FORMAT_YCbCr_420_I = HAL_PIXEL_FORMAT_YCbCr_420_I
};
/* values for copybit_set_parameter(OVERLAY_TRANSFORM) */
enum {
/* flip source image horizontally */
OVERLAY_TRANSFORM_FLIP_H = HAL_TRANSFORM_FLIP_V,
/* flip source image vertically */
OVERLAY_TRANSFORM_FLIP_V = HAL_TRANSFORM_FLIP_H,
/* rotate source image 90 degrees */
OVERLAY_TRANSFORM_ROT_90 = HAL_TRANSFORM_ROT_90,
/* rotate source image 180 degrees */
OVERLAY_TRANSFORM_ROT_180 = HAL_TRANSFORM_ROT_180,
/* rotate source image 270 degrees */
OVERLAY_TRANSFORM_ROT_270 = HAL_TRANSFORM_ROT_270
};
/* names for setParameter() */
enum {
/* rotation of the source image in degrees (0 to 359) */
OVERLAY_ROTATION_DEG = 1,
/* enable or disable dithering */
OVERLAY_DITHER = 3,
/* transformation applied (this is a superset of COPYBIT_ROTATION_DEG) */
OVERLAY_TRANSFORM = 4,
};
/* enable/disable value setParameter() */
enum {
OVERLAY_DISABLE = 0,
OVERLAY_ENABLE = 1
};
/* names for get() */
enum {
/* Maximum amount of minification supported by the hardware*/
OVERLAY_MINIFICATION_LIMIT = 1,
/* Maximum amount of magnification supported by the hardware */
OVERLAY_MAGNIFICATION_LIMIT = 2,
/* Number of fractional bits support by the overlay scaling engine */
OVERLAY_SCALING_FRAC_BITS = 3,
/* Supported rotation step in degrees. */
OVERLAY_ROTATION_STEP_DEG = 4,
/* horizontal alignment in pixels */
OVERLAY_HORIZONTAL_ALIGNMENT = 5,
/* vertical alignment in pixels */
OVERLAY_VERTICAL_ALIGNMENT = 6,
/* width alignment restrictions. negative number for max. power-of-two */
OVERLAY_WIDTH_ALIGNMENT = 7,
/* height alignment restrictions. negative number for max. power-of-two */
OVERLAY_HEIGHT_ALIGNMENT = 8,
};
/*****************************************************************************/
/* opaque reference to an Overlay kernel object */
typedef const native_handle* overlay_handle_t;
typedef struct overlay_t {
uint32_t w;
uint32_t h;
int32_t format;
uint32_t w_stride;
uint32_t h_stride;
uint32_t reserved[3];
/* returns a reference to this overlay's handle (the caller doesn't
* take ownership) */
overlay_handle_t (*getHandleRef)(struct overlay_t* overlay);
uint32_t reserved_procs[7];
} overlay_t;
typedef void* overlay_buffer_t;
/*****************************************************************************/
/**
* Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
* and the fields of this data structure must begin with hw_module_t
* followed by module specific information.
*/
struct overlay_module_t {
struct hw_module_t common;
};
/*****************************************************************************/
/**
* Every device data structure must begin with hw_device_t
* followed by module specific public methods and attributes.
*/
struct overlay_control_device_t {
struct hw_device_t common;
/* get static informations about the capabilities of the overlay engine */
int (*get)(struct overlay_control_device_t *dev, int name);
/* creates an overlay matching the given parameters as closely as possible.
* returns an error if no more overlays are available. The actual
* size and format is returned in overlay_t. */
overlay_t* (*createOverlay)(struct overlay_control_device_t *dev,
uint32_t w, uint32_t h, int32_t format);
/* destroys an overlay. This call releases all
* resources associated with overlay_t and make it invalid */
void (*destroyOverlay)(struct overlay_control_device_t *dev,
overlay_t* overlay);
/* set position and scaling of the given overlay as closely as possible.
* if scaling cannot be performed, overlay must be centered. */
int (*setPosition)(struct overlay_control_device_t *dev,
overlay_t* overlay,
int x, int y, uint32_t w, uint32_t h);
/* returns the actual position and size of the overlay */
int (*getPosition)(struct overlay_control_device_t *dev,
overlay_t* overlay,
int* x, int* y, uint32_t* w, uint32_t* h);
/* sets configurable parameters for this overlay. returns an error if not
* supported. */
int (*setParameter)(struct overlay_control_device_t *dev,
overlay_t* overlay, int param, int value);
};
struct overlay_data_device_t {
struct hw_device_t common;
/* initialize the overlay from the given handle. this associates this
* overlay data module to its control module */
int (*initialize)(struct overlay_data_device_t *dev,
overlay_handle_t handle);
/* blocks until an overlay buffer is available and return that buffer. */
int (*dequeueBuffer)(struct overlay_data_device_t *dev,
overlay_buffer_t *buf);
/* release the overlay buffer and post it */
int (*queueBuffer)(struct overlay_data_device_t *dev,
overlay_buffer_t buffer);
/* returns the address of a given buffer if supported, NULL otherwise. */
void* (*getBufferAddress)(struct overlay_data_device_t *dev,
overlay_buffer_t buffer);
int (*getBufferCount)(struct overlay_data_device_t *dev);
};
/*****************************************************************************/
/** convenience API for opening and closing a device */
static inline int overlay_control_open(const struct hw_module_t* module,
struct overlay_control_device_t** device) {
return module->methods->open(module,
OVERLAY_HARDWARE_CONTROL, (struct hw_device_t**)device);
}
static inline int overlay_control_close(struct overlay_control_device_t* device) {
return device->common.close(&device->common);
}
static inline int overlay_data_open(const struct hw_module_t* module,
struct overlay_data_device_t** device) {
return module->methods->open(module,
OVERLAY_HARDWARE_DATA, (struct hw_device_t**)device);
}
static inline int overlay_data_close(struct overlay_data_device_t* device) {
return device->common.close(&device->common);
}
__END_DECLS
#endif // ANDROID_OVERLAY_INTERFACE_H
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