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#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGPipe.h"
#include "SkSockets.h"
#include "SkNetPipeController.h"
#include "SkCornerPathEffect.h"
#include "SkOSMenu.h"
#include <map>
/**
* Drawing Server
*
* This simple drawing server can accept connections from multiple drawing
* clients simultaneously. It accumulates drawing data from each client each
* frame, stores it in the appropriate place, and then broadcasts incremental
* changes back to all the clients. Each logical packet, meaning one brush
* stoke in this case can be of two types, append and replace. Append types are
* completed strokes ready to be stored in the fData queue and will no longer be
* modified. Replace types are drawing operations that are still in progress on
* the client side, so they are appended to fBuffer. The location and size of
* the buffered data for each client is stored in a map and updated properly.
* Each time a new replace drawing call is received from a client, its previous
* buffered data is discarded.
* Since the Server keeps all the complete drawing data and the latest buffered
* data, it's able to switch between vector and bitmap drawing
*/
class DrawingServerView : public SampleView {
public:
DrawingServerView(){
fServer = new SkTCPServer(40000);
fServer->suspendWrite();
fTotalBytesRead = fTotalBytesWritten = 0;
fVector = true;
}
~DrawingServerView() {
delete fServer;
fData.reset();
fBuffer.reset();
fClientMap.clear();
}
virtual void requestMenu(SkOSMenu* menu) {
menu->setTitle("Drawing Server");
menu->appendAction("Clear", this->getSinkID());
menu->appendSwitch("Vector", "Vector", this->getSinkID(), fVector);
}
protected:
static void readData(int cid, const void* data, size_t size,
SkSocket::DataType type, void* context) {
DrawingServerView* view = (DrawingServerView*)context;
view->onRead(cid, data, size, type);
}
void onRead(int cid, const void* data, size_t size, SkSocket::DataType type) {
if (NULL == data && size <= 0)
return;
ClientState* cs;
std::map<int, ClientState*>::iterator it = fClientMap.find(cid);
if (it == fClientMap.end()) { //New client
cs = new ClientState;
cs->bufferBase = 0;
cs->bufferSize = 0;
fClientMap[cid] = cs;
}
else {
cs = it->second;
}
if (type == SkSocket::kPipeReplace_type) {
fBuffer.remove(cs->bufferBase, cs->bufferSize);
for (it = fClientMap.begin(); it != fClientMap.end(); ++it) {
if (cid == it->first)
continue;
else {
if (it->second->bufferBase > cs->bufferBase) {
it->second->bufferBase -= cs->bufferSize;
SkASSERT(it->second->bufferBase >= 0);
}
}
}
cs->bufferBase = fBuffer.count();
cs->bufferSize = size;
fBuffer.append(size, (const char*)data);
}
else if (type == SkSocket::kPipeAppend_type) {
fData.append(size, (const char*)data);
fServer->resumeWrite();
fServer->writePacket(fData.begin() + fTotalBytesWritten,
fData.count() - fTotalBytesWritten,
SkSocket::kPipeAppend_type);
fTotalBytesWritten = fData.count();
fServer->suspendWrite();
}
else {
//other types of data
}
}
bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Drawing Server");
return true;
}
return this->INHERITED::onQuery(evt);
}
bool onEvent(const SkEvent& evt) {
if (SkOSMenu::FindAction(evt, "Clear")) {
this->clear();
return true;
}
if (SkOSMenu::FindSwitchState(evt, "Vector", &fVector)) {
this->clearBitmap();
return true;
}
return this->INHERITED::onEvent(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
if (fCurrMatrix != canvas->getTotalMatrix()) {
fTotalBytesRead = 0;
fCurrMatrix = canvas->getTotalMatrix();
}
fServer->acceptConnections();
if (fServer->readPacket(readData, this) > 0) {
fServer->resumeWrite();
}
else {
fServer->suspendWrite();
}
size_t bytesRead;
SkGPipeReader::Status stat;
SkCanvas bufferCanvas(fBase);
SkCanvas* tempCanvas;
while (fTotalBytesRead < fData.count()) {
if (fVector) {
tempCanvas = canvas;
} else {
tempCanvas = &bufferCanvas;
}
SkGPipeReader reader(tempCanvas);
stat = reader.playback(fData.begin() + fTotalBytesRead,
fData.count() - fTotalBytesRead,
&bytesRead);
SkASSERT(SkGPipeReader::kError_Status != stat);
fTotalBytesRead += bytesRead;
}
if (fVector) {
fTotalBytesRead = 0;
} else {
canvas->drawBitmap(fBase, 0, 0, NULL);
}
size_t totalBytesRead = 0;
while (totalBytesRead < fBuffer.count()) {
SkGPipeReader reader(canvas);
stat = reader.playback(fBuffer.begin() + totalBytesRead,
fBuffer.count() - totalBytesRead,
&bytesRead);
SkASSERT(SkGPipeReader::kError_Status != stat);
totalBytesRead += bytesRead;
}
fServer->writePacket(fBuffer.begin(), fBuffer.count(),
SkSocket::kPipeReplace_type);
this->inval(NULL);
}
virtual void onSizeChange() {
this->INHERITED::onSizeChange();
fBase.setConfig(SkBitmap::kARGB_8888_Config,
this->width(),
this->height());
fBase.allocPixels(NULL);
this->clearBitmap();
}
private:
void clear() {
fData.reset();
fBuffer.reset();
fTotalBytesRead = fTotalBytesWritten = 0;
fClientMap.clear();
this->clearBitmap();
}
void clearBitmap() {
fTotalBytesRead = 0;
fBase.eraseColor(fBGColor);
}
struct ClientState {
int bufferBase;
int bufferSize;
};
std::map<int, ClientState*> fClientMap;
SkTDArray<char> fData;
SkTDArray<char> fBuffer;
size_t fTotalBytesRead;
size_t fTotalBytesWritten;
SkMatrix fCurrMatrix;
SkBitmap fBase;
bool fVector;
SkTCPServer* fServer;
typedef SampleView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new DrawingServerView; }
static SkViewRegister reg(MyFactory);
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