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replicant-frameworks_native/libs/surfaceflinger_client/SurfaceComposerClient.cpp
Mathias Agopian df85c455c3 refactored screenshot code 
the core screenshot function now can capture the screen at any lower resolution
performing bilinear filtering.

we also now have some client code to interface with the screenshot service.

it's now possible to request a screenshot at a lower resolution.

Change-Id: I33689bba98507ab928d0898b21596d0d2fe4b953
2010-10-04 17:36:17 -07:00

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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.
*/
#define LOG_TAG "SurfaceComposerClient"
#include <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/threads.h>
#include <utils/SortedVector.h>
#include <utils/Log.h>
#include <utils/Singleton.h>
#include <binder/IServiceManager.h>
#include <binder/IMemory.h>
#include <ui/DisplayInfo.h>
#include <surfaceflinger/ISurfaceComposer.h>
#include <surfaceflinger/ISurfaceComposerClient.h>
#include <surfaceflinger/ISurface.h>
#include <surfaceflinger/SurfaceComposerClient.h>
#include <private/surfaceflinger/LayerState.h>
#include <private/surfaceflinger/SharedBufferStack.h>
namespace android {
// ---------------------------------------------------------------------------
ANDROID_SINGLETON_STATIC_INSTANCE(ComposerService);
ComposerService::ComposerService()
: Singleton<ComposerService>() {
const String16 name("SurfaceFlinger");
while (getService(name, &mComposerService) != NO_ERROR) {
usleep(250000);
}
mServerCblkMemory = mComposerService->getCblk();
mServerCblk = static_cast<surface_flinger_cblk_t volatile *>(
mServerCblkMemory->getBase());
}
sp<ISurfaceComposer> ComposerService::getComposerService() {
return ComposerService::getInstance().mComposerService;
}
surface_flinger_cblk_t const volatile * ComposerService::getControlBlock() {
return ComposerService::getInstance().mServerCblk;
}
static inline sp<ISurfaceComposer> getComposerService() {
return ComposerService::getComposerService();
}
static inline surface_flinger_cblk_t const volatile * get_cblk() {
return ComposerService::getControlBlock();
}
// ---------------------------------------------------------------------------
class Composer : public Singleton<Composer>
{
Mutex mLock;
SortedVector< wp<SurfaceComposerClient> > mActiveConnections;
SortedVector<sp<SurfaceComposerClient> > mOpenTransactions;
Composer() : Singleton<Composer>() {
}
void addClientImpl(const sp<SurfaceComposerClient>& client) {
Mutex::Autolock _l(mLock);
mActiveConnections.add(client);
}
void removeClientImpl(const sp<SurfaceComposerClient>& client) {
Mutex::Autolock _l(mLock);
mActiveConnections.remove(client);
}
void openGlobalTransactionImpl()
{
Mutex::Autolock _l(mLock);
if (mOpenTransactions.size()) {
LOGE("openGlobalTransaction() called more than once. skipping.");
return;
}
const size_t N = mActiveConnections.size();
for (size_t i=0; i<N; i++) {
sp<SurfaceComposerClient> client(mActiveConnections[i].promote());
if (client != 0 && mOpenTransactions.indexOf(client) < 0) {
if (client->openTransaction() == NO_ERROR) {
mOpenTransactions.add(client);
} else {
LOGE("openTransaction on client %p failed", client.get());
// let it go, it'll fail later when the user
// tries to do something with the transaction
}
}
}
}
void closeGlobalTransactionImpl()
{
mLock.lock();
SortedVector< sp<SurfaceComposerClient> > clients(mOpenTransactions);
mOpenTransactions.clear();
mLock.unlock();
sp<ISurfaceComposer> sm(getComposerService());
sm->openGlobalTransaction();
const size_t N = clients.size();
for (size_t i=0; i<N; i++) {
clients[i]->closeTransaction();
}
sm->closeGlobalTransaction();
}
friend class Singleton<Composer>;
public:
static void addClient(const sp<SurfaceComposerClient>& client) {
Composer::getInstance().addClientImpl(client);
}
static void removeClient(const sp<SurfaceComposerClient>& client) {
Composer::getInstance().removeClientImpl(client);
}
static void openGlobalTransaction() {
Composer::getInstance().openGlobalTransactionImpl();
}
static void closeGlobalTransaction() {
Composer::getInstance().closeGlobalTransactionImpl();
}
};
ANDROID_SINGLETON_STATIC_INSTANCE(Composer);
// ---------------------------------------------------------------------------
static inline int compare_type( const layer_state_t& lhs,
const layer_state_t& rhs) {
if (lhs.surface < rhs.surface) return -1;
if (lhs.surface > rhs.surface) return 1;
return 0;
}
SurfaceComposerClient::SurfaceComposerClient()
: mTransactionOpen(0), mPrebuiltLayerState(0), mStatus(NO_INIT)
{
}
void SurfaceComposerClient::onFirstRef()
{
sp<ISurfaceComposer> sm(getComposerService());
if (sm != 0) {
sp<ISurfaceComposerClient> conn = sm->createConnection();
if (conn != 0) {
mClient = conn;
Composer::addClient(this);
mPrebuiltLayerState = new layer_state_t;
mStatus = NO_ERROR;
}
}
}
SurfaceComposerClient::~SurfaceComposerClient()
{
delete mPrebuiltLayerState;
dispose();
}
status_t SurfaceComposerClient::initCheck() const
{
return mStatus;
}
sp<IBinder> SurfaceComposerClient::connection() const
{
return (mClient != 0) ? mClient->asBinder() : 0;
}
status_t SurfaceComposerClient::linkToComposerDeath(
const sp<IBinder::DeathRecipient>& recipient,
void* cookie, uint32_t flags)
{
sp<ISurfaceComposer> sm(getComposerService());
return sm->asBinder()->linkToDeath(recipient, cookie, flags);
}
void SurfaceComposerClient::dispose()
{
// this can be called more than once.
sp<ISurfaceComposerClient> client;
Mutex::Autolock _lm(mLock);
if (mClient != 0) {
Composer::removeClient(this);
client = mClient; // hold ref while lock is held
mClient.clear();
}
mStatus = NO_INIT;
}
status_t SurfaceComposerClient::getDisplayInfo(
DisplayID dpy, DisplayInfo* info)
{
if (uint32_t(dpy)>=SharedBufferStack::NUM_DISPLAY_MAX)
return BAD_VALUE;
volatile surface_flinger_cblk_t const * cblk = get_cblk();
volatile display_cblk_t const * dcblk = cblk->displays + dpy;
info->w = dcblk->w;
info->h = dcblk->h;
info->orientation = dcblk->orientation;
info->xdpi = dcblk->xdpi;
info->ydpi = dcblk->ydpi;
info->fps = dcblk->fps;
info->density = dcblk->density;
return getPixelFormatInfo(dcblk->format, &(info->pixelFormatInfo));
}
ssize_t SurfaceComposerClient::getDisplayWidth(DisplayID dpy)
{
if (uint32_t(dpy)>=SharedBufferStack::NUM_DISPLAY_MAX)
return BAD_VALUE;
volatile surface_flinger_cblk_t const * cblk = get_cblk();
volatile display_cblk_t const * dcblk = cblk->displays + dpy;
return dcblk->w;
}
ssize_t SurfaceComposerClient::getDisplayHeight(DisplayID dpy)
{
if (uint32_t(dpy)>=SharedBufferStack::NUM_DISPLAY_MAX)
return BAD_VALUE;
volatile surface_flinger_cblk_t const * cblk = get_cblk();
volatile display_cblk_t const * dcblk = cblk->displays + dpy;
return dcblk->h;
}
ssize_t SurfaceComposerClient::getDisplayOrientation(DisplayID dpy)
{
if (uint32_t(dpy)>=SharedBufferStack::NUM_DISPLAY_MAX)
return BAD_VALUE;
volatile surface_flinger_cblk_t const * cblk = get_cblk();
volatile display_cblk_t const * dcblk = cblk->displays + dpy;
return dcblk->orientation;
}
ssize_t SurfaceComposerClient::getNumberOfDisplays()
{
volatile surface_flinger_cblk_t const * cblk = get_cblk();
uint32_t connected = cblk->connected;
int n = 0;
while (connected) {
if (connected&1) n++;
connected >>= 1;
}
return n;
}
sp<SurfaceControl> SurfaceComposerClient::createSurface(
int pid,
DisplayID display,
uint32_t w,
uint32_t h,
PixelFormat format,
uint32_t flags)
{
String8 name;
const size_t SIZE = 128;
char buffer[SIZE];
snprintf(buffer, SIZE, "<pid_%d>", getpid());
name.append(buffer);
return SurfaceComposerClient::createSurface(pid, name, display,
w, h, format, flags);
}
sp<SurfaceControl> SurfaceComposerClient::createSurface(
int pid,
const String8& name,
DisplayID display,
uint32_t w,
uint32_t h,
PixelFormat format,
uint32_t flags)
{
sp<SurfaceControl> result;
if (mStatus == NO_ERROR) {
ISurfaceComposerClient::surface_data_t data;
sp<ISurface> surface = mClient->createSurface(&data, pid, name,
display, w, h, format, flags);
if (surface != 0) {
result = new SurfaceControl(this, surface, data, w, h, format, flags);
}
}
return result;
}
status_t SurfaceComposerClient::destroySurface(SurfaceID sid)
{
if (mStatus != NO_ERROR)
return mStatus;
// it's okay to destroy a surface while a transaction is open,
// (transactions really are a client-side concept)
// however, this indicates probably a misuse of the API or a bug
// in the client code.
LOGW_IF(mTransactionOpen,
"Destroying surface while a transaction is open. "
"Client %p: destroying surface %d, mTransactionOpen=%d",
this, sid, mTransactionOpen);
status_t err = mClient->destroySurface(sid);
return err;
}
void SurfaceComposerClient::openGlobalTransaction()
{
Composer::openGlobalTransaction();
}
void SurfaceComposerClient::closeGlobalTransaction()
{
Composer::closeGlobalTransaction();
}
status_t SurfaceComposerClient::freezeDisplay(DisplayID dpy, uint32_t flags)
{
sp<ISurfaceComposer> sm(getComposerService());
return sm->freezeDisplay(dpy, flags);
}
status_t SurfaceComposerClient::unfreezeDisplay(DisplayID dpy, uint32_t flags)
{
sp<ISurfaceComposer> sm(getComposerService());
return sm->unfreezeDisplay(dpy, flags);
}
int SurfaceComposerClient::setOrientation(DisplayID dpy,
int orientation, uint32_t flags)
{
sp<ISurfaceComposer> sm(getComposerService());
return sm->setOrientation(dpy, orientation, flags);
}
status_t SurfaceComposerClient::openTransaction()
{
if (mStatus != NO_ERROR)
return mStatus;
Mutex::Autolock _l(mLock);
mTransactionOpen++;
return NO_ERROR;
}
status_t SurfaceComposerClient::closeTransaction()
{
if (mStatus != NO_ERROR)
return mStatus;
Mutex::Autolock _l(mLock);
if (mTransactionOpen <= 0) {
LOGE( "closeTransaction (client %p, mTransactionOpen=%d) "
"called more times than openTransaction()",
this, mTransactionOpen);
return INVALID_OPERATION;
}
if (mTransactionOpen >= 2) {
mTransactionOpen--;
return NO_ERROR;
}
mTransactionOpen = 0;
const ssize_t count = mStates.size();
if (count) {
mClient->setState(count, mStates.array());
mStates.clear();
}
return NO_ERROR;
}
layer_state_t* SurfaceComposerClient::get_state_l(SurfaceID index)
{
// API usage error, do nothing.
if (mTransactionOpen<=0) {
LOGE("Not in transaction (client=%p, SurfaceID=%d, mTransactionOpen=%d",
this, int(index), mTransactionOpen);
return 0;
}
// use mPrebuiltLayerState just to find out if we already have it
layer_state_t& dummy(*mPrebuiltLayerState);
dummy.surface = index;
ssize_t i = mStates.indexOf(dummy);
if (i < 0) {
// we don't have it, add an initialized layer_state to our list
i = mStates.add(dummy);
}
return mStates.editArray() + i;
}
layer_state_t* SurfaceComposerClient::lockLayerState(SurfaceID id)
{
layer_state_t* s;
mLock.lock();
s = get_state_l(id);
if (!s) mLock.unlock();
return s;
}
void SurfaceComposerClient::unlockLayerState()
{
mLock.unlock();
}
status_t SurfaceComposerClient::setPosition(SurfaceID id, int32_t x, int32_t y)
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::ePositionChanged;
s->x = x;
s->y = y;
unlockLayerState();
return NO_ERROR;
}
status_t SurfaceComposerClient::setSize(SurfaceID id, uint32_t w, uint32_t h)
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::eSizeChanged;
s->w = w;
s->h = h;
unlockLayerState();
return NO_ERROR;
}
status_t SurfaceComposerClient::setLayer(SurfaceID id, int32_t z)
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::eLayerChanged;
s->z = z;
unlockLayerState();
return NO_ERROR;
}
status_t SurfaceComposerClient::hide(SurfaceID id)
{
return setFlags(id, ISurfaceComposer::eLayerHidden,
ISurfaceComposer::eLayerHidden);
}
status_t SurfaceComposerClient::show(SurfaceID id, int32_t)
{
return setFlags(id, 0, ISurfaceComposer::eLayerHidden);
}
status_t SurfaceComposerClient::freeze(SurfaceID id)
{
return setFlags(id, ISurfaceComposer::eLayerFrozen,
ISurfaceComposer::eLayerFrozen);
}
status_t SurfaceComposerClient::unfreeze(SurfaceID id)
{
return setFlags(id, 0, ISurfaceComposer::eLayerFrozen);
}
status_t SurfaceComposerClient::setFlags(SurfaceID id,
uint32_t flags, uint32_t mask)
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::eVisibilityChanged;
s->flags &= ~mask;
s->flags |= (flags & mask);
s->mask |= mask;
unlockLayerState();
return NO_ERROR;
}
status_t SurfaceComposerClient::setTransparentRegionHint(
SurfaceID id, const Region& transparentRegion)
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::eTransparentRegionChanged;
s->transparentRegion = transparentRegion;
unlockLayerState();
return NO_ERROR;
}
status_t SurfaceComposerClient::setAlpha(SurfaceID id, float alpha)
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::eAlphaChanged;
s->alpha = alpha;
unlockLayerState();
return NO_ERROR;
}
status_t SurfaceComposerClient::setMatrix(
SurfaceID id,
float dsdx, float dtdx,
float dsdy, float dtdy )
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::eMatrixChanged;
layer_state_t::matrix22_t matrix;
matrix.dsdx = dsdx;
matrix.dtdx = dtdx;
matrix.dsdy = dsdy;
matrix.dtdy = dtdy;
s->matrix = matrix;
unlockLayerState();
return NO_ERROR;
}
status_t SurfaceComposerClient::setFreezeTint(SurfaceID id, uint32_t tint)
{
layer_state_t* s = lockLayerState(id);
if (!s) return BAD_INDEX;
s->what |= ISurfaceComposer::eFreezeTintChanged;
s->tint = tint;
unlockLayerState();
return NO_ERROR;
}
// ----------------------------------------------------------------------------
ScreenshotClient::ScreenshotClient()
: mWidth(0), mHeight(0), mFormat(PIXEL_FORMAT_NONE) {
}
status_t ScreenshotClient::update() {
sp<ISurfaceComposer> s(ComposerService::getComposerService());
if (s == NULL) return NO_INIT;
mHeap = 0;
return s->captureScreen(0, &mHeap,
&mWidth, &mHeight, &mFormat, 0, 0);
}
status_t ScreenshotClient::update(uint32_t reqWidth, uint32_t reqHeight) {
sp<ISurfaceComposer> s(ComposerService::getComposerService());
if (s == NULL) return NO_INIT;
mHeap = 0;
return s->captureScreen(0, &mHeap,
&mWidth, &mHeight, &mFormat, reqWidth, reqHeight);
}
void ScreenshotClient::release() {
mHeap = 0;
}
void const* ScreenshotClient::getPixels() const {
return mHeap->getBase();
}
uint32_t ScreenshotClient::getWidth() const {
return mWidth;
}
uint32_t ScreenshotClient::getHeight() const {
return mHeight;
}
PixelFormat ScreenshotClient::getFormat() const {
return mFormat;
}
uint32_t ScreenshotClient::getStride() const {
return mWidth;
}
size_t ScreenshotClient::getSize() const {
return mHeap->getSize();
}
// ----------------------------------------------------------------------------
}; // namespace android
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