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Fix for server saving, use Paeth filter before compressing heightfield data.

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This commit is contained in:
Andrzej Kapolka 2014-11-13 16:11:48 -08:00
parent 8a0ff4acf5
commit dd87a45211
3 changed files with 117 additions and 11 deletions
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8
assignment-client/src/metavoxels/MetavoxelServer.cpp
View file

@ -35,14 +35,16 @@ void MetavoxelServer::applyEdit(const MetavoxelEditMessage& edit) {
setData(data);
}
void MetavoxelServer::setData(const MetavoxelData& data) {
void MetavoxelServer::setData(const MetavoxelData& data, bool loaded) {
if (_data == data) {
return;
}
emit dataChanged(_data = data);
if (!_savedDataInitialized) {
if (loaded) {
_savedData = data;
} else if (!_savedDataInitialized) {
_savedDataInitialized = true;
// start the save timer
@ -340,7 +342,7 @@ void MetavoxelPersister::load() {
debug << "failed, " << e.getDescription();
return;
}
QMetaObject::invokeMethod(_server, "setData", Q_ARG(const MetavoxelData&, data));
QMetaObject::invokeMethod(_server, "setData", Q_ARG(const MetavoxelData&, data), Q_ARG(bool, true));
debug << "done.";
}
data.dumpStats();

2
assignment-client/src/metavoxels/MetavoxelServer.h
View file

@ -36,7 +36,7 @@ public:
const MetavoxelData& getData() const { return _data; }
Q_INVOKABLE void setData(const MetavoxelData& data);
Q_INVOKABLE void setData(const MetavoxelData& data, bool loaded = false);
virtual void run();

118
libraries/metavoxels/src/Spanner.cpp
View file

@ -613,7 +613,31 @@ static QByteArray encodeHeightfieldHeight(int offsetX, int offsetY, int width, i
*header++ = offsetY;
*header++ = width;
*header++ = height;
inflated.append((const char*)contents.constData(), contents.size() * sizeof(quint16));
if (!contents.isEmpty()) {
// encode with Paeth filter (see http://en.wikipedia.org/wiki/Portable_Network_Graphics#Filtering)
QVector<quint16> filteredContents(contents.size());
const quint16* src = contents.constData();
quint16* dest = filteredContents.data();
*dest++ = *src++;
for (quint16* end = dest + width - 1; dest != end; dest++, src++) {
*dest = *src - src[-1];
}
for (int y = 1; y < height; y++) {
*dest++ = *src - src[-width];
src++;
for (quint16* end = dest + width - 1; dest != end; dest++, src++) {
int a = src[-1];
int b = src[-width];
int c = src[-width - 1];
int p = a + b - c;
int ad = abs(a - p);
int bd = abs(b - p);
int cd = abs(c - p);
*dest = *src - (ad < bd ? (ad < cd ? a : c) : (bd < cd ? b : c));
}
}
inflated.append((const char*)filteredContents.constData(), filteredContents.size() * sizeof(quint16));
}
return qCompress(inflated);
}
@ -626,9 +650,30 @@ static QVector<quint16> decodeHeightfieldHeight(const QByteArray& encoded, int&
width = *header++;
height = *header++;
int payloadSize = inflated.size() - HEIGHTFIELD_DATA_HEADER_SIZE;
QVector<quint16> decoded(payloadSize / sizeof(quint16));
memcpy(decoded.data(), inflated.constData() + HEIGHTFIELD_DATA_HEADER_SIZE, payloadSize);
return decoded;
QVector<quint16> unfiltered(payloadSize / sizeof(quint16));
if (!unfiltered.isEmpty()) {
quint16* dest = unfiltered.data();
const quint16* src = (const quint16*)(inflated.constData() + HEIGHTFIELD_DATA_HEADER_SIZE);
*dest++ = *src++;
for (quint16* end = dest + width - 1; dest != end; dest++, src++) {
*dest = *src + dest[-1];
}
for (int y = 1; y < height; y++) {
*dest = (*src++) + dest[-width];
dest++;
for (quint16* end = dest + width - 1; dest != end; dest++, src++) {
int a = dest[-1];
int b = dest[-width];
int c = dest[-width - 1];
int p = a + b - c;
int ad = abs(a - p);
int bd = abs(b - p);
int cd = abs(c - p);
*dest = *src + (ad < bd ? (ad < cd ? a : c) : (bd < cd ? b : c));
}
}
}
return unfiltered;
}
HeightfieldHeight::HeightfieldHeight(int width, const QVector<quint16>& contents) :
@ -861,13 +906,42 @@ void HeightfieldHeightEditor::clear() {
}
static QByteArray encodeHeightfieldColor(int offsetX, int offsetY, int width, int height, const QByteArray& contents) {
QByteArray inflated(HEIGHTFIELD_DATA_HEADER_SIZE, 0);
QByteArray inflated(HEIGHTFIELD_DATA_HEADER_SIZE + contents.size(), 0);
qint32* header = (qint32*)inflated.data();
*header++ = offsetX;
*header++ = offsetY;
*header++ = width;
*header++ = height;
inflated.append(contents);
if (!contents.isEmpty()) {
// encode with Paeth filter (see http://en.wikipedia.org/wiki/Portable_Network_Graphics#Filtering)
const uchar* src = (const uchar*)contents.constData();
uchar* dest = (uchar*)inflated.data() + HEIGHTFIELD_DATA_HEADER_SIZE;
*dest++ = *src++;
*dest++ = *src++;
*dest++ = *src++;
int stride = width * DataBlock::COLOR_BYTES;
for (uchar* end = dest + stride - DataBlock::COLOR_BYTES; dest != end; dest++, src++) {
*dest = *src - src[-DataBlock::COLOR_BYTES];
}
for (int y = 1; y < height; y++) {
*dest++ = *src - src[-stride];
src++;
*dest++ = *src - src[-stride];
src++;
*dest++ = *src - src[-stride];
src++;
for (uchar* end = dest + stride - DataBlock::COLOR_BYTES; dest != end; dest++, src++) {
int a = src[-DataBlock::COLOR_BYTES];
int b = src[-stride];
int c = src[-stride - DataBlock::COLOR_BYTES];
int p = a + b - c;
int ad = abs(a - p);
int bd = abs(b - p);
int cd = abs(c - p);
*dest = *src - (ad < bd ? (ad < cd ? a : c) : (bd < cd ? b : c));
}
}
}
return qCompress(inflated);
}
@ -878,7 +952,37 @@ static QByteArray decodeHeightfieldColor(const QByteArray& encoded, int& offsetX
offsetY = *header++;
width = *header++;
height = *header++;
return inflated.mid(HEIGHTFIELD_DATA_HEADER_SIZE);
QByteArray contents(inflated.size() - HEIGHTFIELD_DATA_HEADER_SIZE, 0);
if (!contents.isEmpty()) {
const uchar* src = (const uchar*)inflated.constData() + HEIGHTFIELD_DATA_HEADER_SIZE;
uchar* dest = (uchar*)contents.data();
*dest++ = *src++;
*dest++ = *src++;
*dest++ = *src++;
int stride = width * DataBlock::COLOR_BYTES;
for (uchar* end = dest + stride - DataBlock::COLOR_BYTES; dest != end; dest++, src++) {
*dest = *src + dest[-DataBlock::COLOR_BYTES];
}
for (int y = 1; y < height; y++) {
*dest = (*src++) + dest[-stride];
dest++;
*dest = (*src++) + dest[-stride];
dest++;
*dest = (*src++) + dest[-stride];
dest++;
for (uchar* end = dest + stride - DataBlock::COLOR_BYTES; dest != end; dest++, src++) {
int a = dest[-DataBlock::COLOR_BYTES];
int b = dest[-stride];
int c = dest[-stride - DataBlock::COLOR_BYTES];
int p = a + b - c;
int ad = abs(a - p);
int bd = abs(b - p);
int cd = abs(c - p);
*dest = *src + (ad < bd ? (ad < cd ? a : c) : (bd < cd ? b : c));
}
}
}
return contents;
}
HeightfieldColor::HeightfieldColor(int width, const QByteArray& contents) :