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/*
* Copyright (C) 2007 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_UI_SHARED_STATE_H
#define ANDROID_UI_SHARED_STATE_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/threads.h>
namespace android {
/*
* These structures are shared between the composer process and its clients
*/
// ---------------------------------------------------------------------------
struct surface_info_t { // 4 longs, 16 bytes
enum {
eBufferDirty = 0x01
};
uint16_t w;
uint16_t h;
uint16_t stride;
uint16_t bpr;
uint16_t reserved;
uint8_t format;
uint8_t flags;
ssize_t bits_offset;
};
// ---------------------------------------------------------------------------
const uint32_t NUM_LAYERS_MAX = 31;
enum { // layer_cblk_t swapState
eIndex = 0x00000001,
eFlipRequested = 0x00000002,
eResizeBuffer0 = 0x00000004,
eResizeBuffer1 = 0x00000008,
eResizeRequested = eResizeBuffer0 | eResizeBuffer1,
eBusy = 0x00000010,
eLocked = 0x00000020,
eNextFlipPending = 0x00000040,
eInvalidSurface = 0x00000080
};
enum { // layer_cblk_t flags
eLayerNotPosted = 0x00000001,
eNoCopyBack = 0x00000002,
eReserved = 0x0000007C,
eBufferIndexShift = 7,
eBufferIndex = 1<<eBufferIndexShift,
};
struct flat_region_t // 40 bytes
{
int32_t count;
int16_t l;
int16_t t;
int16_t r;
int16_t b;
uint16_t runs[14];
};
struct layer_cblk_t // (128 bytes)
{
volatile int32_t swapState; // 4
volatile int32_t flags; // 4
volatile int32_t identity; // 4
int32_t reserved; // 4
surface_info_t surface[2]; // 32
flat_region_t region[2]; // 80
static inline int backBuffer(uint32_t state) {
return ((state & eIndex) ^ ((state & eFlipRequested)>>1));
}
static inline int frontBuffer(uint32_t state) {
return 1 - backBuffer(state);
}
};
// ---------------------------------------------------------------------------
struct per_client_cblk_t // 4KB max
{
Mutex lock;
Condition cv;
layer_cblk_t layers[NUM_LAYERS_MAX] __attribute__((aligned(32)));
enum {
BLOCKING = 0x00000001,
INSPECT = 0x00000002
};
per_client_cblk_t();
// these functions are used by the clients
status_t validate(size_t i) const;
int32_t lock_layer(size_t i, uint32_t flags);
uint32_t unlock_layer_and_post(size_t i);
void unlock_layer(size_t i);
};
// ---------------------------------------------------------------------------
const uint32_t NUM_DISPLAY_MAX = 4;
struct display_cblk_t
{
uint16_t w;
uint16_t h;
uint8_t format;
uint8_t orientation;
uint8_t reserved[2];
float fps;
float density;
float xdpi;
float ydpi;
uint32_t pad[2];
};
struct surface_flinger_cblk_t // 4KB max
{
surface_flinger_cblk_t();
uint8_t connected;
uint8_t reserved[3];
uint32_t pad[7];
display_cblk_t displays[NUM_DISPLAY_MAX];
};
// ---------------------------------------------------------------------------
template<bool> struct CTA;
template<> struct CTA<true> { };
// compile-time assertions. just to avoid catastrophes.
inline void compile_time_asserts() {
CTA<sizeof(layer_cblk_t) == 128> sizeof__layer_cblk_t__eq_128;
(void)sizeof__layer_cblk_t__eq_128; // we don't want a warning
CTA<sizeof(per_client_cblk_t) <= 4096> sizeof__per_client_cblk_t__le_4096;
(void)sizeof__per_client_cblk_t__le_4096; // we don't want a warning
CTA<sizeof(surface_flinger_cblk_t) <= 4096> sizeof__surface_flinger_cblk_t__le_4096;
(void)sizeof__surface_flinger_cblk_t__le_4096; // we don't want a warning
}
}; // namespace android
#endif // ANDROID_UI_SHARED_STATE_H
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