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/*
* Copyright 2011 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 __GRALLOC_CB_H__
#define __GRALLOC_CB_H__
#include <hardware/hardware.h>
#include <hardware/gralloc.h>
#include <cutils/native_handle.h>
#define BUFFER_HANDLE_MAGIC ((int)0xabfabfab)
#define CB_HANDLE_NUM_INTS(nfds) (int)((sizeof(cb_handle_t) - (nfds)*sizeof(int)) / sizeof(int))
//
// Our buffer handle structure
//
struct cb_handle_t : public native_handle {
cb_handle_t(int p_fd, int p_ashmemSize, int p_usage,
int p_width, int p_height,
int p_glFormat, int p_glType) :
fd(p_fd),
magic(BUFFER_HANDLE_MAGIC),
usage(p_usage),
width(p_width),
height(p_height),
glFormat(p_glFormat),
glType(p_glType),
ashmemSize(p_ashmemSize),
ashmemBase(NULL),
ashmemBasePid(0),
mappedPid(0),
lockedLeft(0),
lockedTop(0),
lockedWidth(0),
lockedHeight(0),
hostHandle(0)
{
version = sizeof(native_handle);
numFds = 0;
numInts = CB_HANDLE_NUM_INTS(numFds);
}
~cb_handle_t() {
magic = 0;
}
void setFd(int p_fd) {
if (p_fd >= 0) {
numFds = 1;
}
else {
numFds = 0;
}
fd = p_fd;
numInts = CB_HANDLE_NUM_INTS(numFds);
}
static bool validate(cb_handle_t * hnd) {
return (hnd &&
hnd->version == sizeof(native_handle) &&
hnd->magic == BUFFER_HANDLE_MAGIC &&
hnd->numInts == CB_HANDLE_NUM_INTS(hnd->numFds));
}
bool canBePosted() {
return (0 != (usage & GRALLOC_USAGE_HW_FB));
}
// file-descriptors
int fd; // ashmem fd (-1 of ashmem region did not allocated, i.e. no SW access needed)
// ints
int magic; // magic number in order to validate a pointer to be a cb_handle_t
int usage; // usage bits the buffer was created with
int width; // buffer width
int height; // buffer height
int glFormat; // OpenGL format enum used for host h/w color buffer
int glType; // OpenGL type enum used when uploading to host
int ashmemSize; // ashmem region size for the buffer (0 unless is HW_FB buffer or
// s/w access is needed)
int ashmemBase; // CPU address of the mapped ashmem region
int ashmemBasePid; // process id which mapped the ashmem region
int mappedPid; // process id which succeeded gralloc_register call
int lockedLeft; // region of buffer locked for s/w write
int lockedTop;
int lockedWidth;
int lockedHeight;
uint32_t hostHandle;
};
#endif //__GRALLOC_CB_H__
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