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Deflated JPEG encoding for blocks above 16x16.

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This commit is contained in:
Andrzej Kapolka 2014-08-14 19:21:32 -07:00
parent 05d6b628fa
commit 67266b41df
1 changed files with 75 additions and 29 deletions
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104
libraries/metavoxels/src/AttributeRegistry.cpp
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@ -55,7 +55,7 @@ AttributeRegistry::AttributeRegistry() :
const float SPANNER_LOD_THRESHOLD_MULTIPLIER = 8.0f;
_spannersAttribute->setLODThresholdMultiplier(SPANNER_LOD_THRESHOLD_MULTIPLIER);
const float HEIGHTFIELD_LOD_THRESHOLD_MULTIPLIER = 40.0f;
const float HEIGHTFIELD_LOD_THRESHOLD_MULTIPLIER = 32.0f;
_heightfieldAttribute->setLODThresholdMultiplier(HEIGHTFIELD_LOD_THRESHOLD_MULTIPLIER);
_heightfieldColorAttribute->setLODThresholdMultiplier(HEIGHTFIELD_LOD_THRESHOLD_MULTIPLIER);
}
@ -493,6 +493,49 @@ HeightfieldData::HeightfieldData(Bitstream& in, int bytes, bool color) {
read(in, bytes, color);
}
enum HeightfieldImage { NULL_HEIGHTFIELD_IMAGE, NORMAL_HEIGHTFIELD_IMAGE, DEFLATED_HEIGHTFIELD_IMAGE };
static QByteArray encodeHeightfieldImage(const QImage& image) {
if (image.isNull()) {
return QByteArray(1, NULL_HEIGHTFIELD_IMAGE);
}
QBuffer buffer;
buffer.open(QIODevice::WriteOnly);
const int JPEG_ENCODE_THRESHOLD = 16;
if (image.width() >= JPEG_ENCODE_THRESHOLD && image.height() >= JPEG_ENCODE_THRESHOLD) {
qint32 offsetX = image.offset().x(), offsetY = image.offset().y();
buffer.write((char*)&offsetX, sizeof(qint32));
buffer.write((char*)&offsetY, sizeof(qint32));
image.save(&buffer, "JPG");
return QByteArray(1, DEFLATED_HEIGHTFIELD_IMAGE) + qCompress(buffer.data());
} else {
buffer.putChar(NORMAL_HEIGHTFIELD_IMAGE);
image.save(&buffer, "PNG");
return buffer.data();
}
}
const QImage decodeHeightfieldImage(const QByteArray& data) {
switch (data.at(0)) {
case NULL_HEIGHTFIELD_IMAGE:
default:
return QImage();
case NORMAL_HEIGHTFIELD_IMAGE:
return QImage::fromData(QByteArray::fromRawData(data.constData() + 1, data.size() - 1));
case DEFLATED_HEIGHTFIELD_IMAGE: {
QByteArray inflated = qUncompress((const uchar*)data.constData() + 1, data.size() - 1);
const int OFFSET_SIZE = sizeof(qint32) * 2;
QImage image = QImage::fromData((const uchar*)inflated.constData() + OFFSET_SIZE, inflated.size() - OFFSET_SIZE);
const qint32* offsets = (const qint32*)inflated.constData();
image.setOffset(QPoint(offsets[0], offsets[1]));
return image;
}
}
}
HeightfieldData::HeightfieldData(Bitstream& in, int bytes, const HeightfieldDataPointer& reference, bool color) {
if (!reference) {
read(in, bytes, color);
@ -502,7 +545,10 @@ HeightfieldData::HeightfieldData(Bitstream& in, int bytes, const HeightfieldData
reference->_encodedDelta = in.readAligned(bytes);
reference->_deltaData = this;
_contents = reference->_contents;
QImage image = QImage::fromData(reference->_encodedDelta);
QImage image = decodeHeightfieldImage(reference->_encodedDelta);
if (image.isNull()) {
return;
}
QPoint offset = image.offset();
image = image.convertToFormat(QImage::Format_RGB888);
if (offset.x() == 0) {
@ -550,9 +596,7 @@ void HeightfieldData::write(Bitstream& out, bool color) {
*dest++ = *src;
}
}
QBuffer buffer(&_encoded);
buffer.open(QIODevice::WriteOnly);
image.save(&buffer, "PNG");
_encoded = encodeHeightfieldImage(image);
}
out << _encoded.size();
out.writeAligned(_encoded);
@ -588,15 +632,17 @@ void HeightfieldData::writeDelta(Bitstream& out, const HeightfieldDataPointer& r
maxY = qMax(maxY, y);
}
}
int width = qMax(maxX - minX + 1, 0);
int height = qMax(maxY - minY + 1, 0);
image = QImage(width, height, QImage::Format_RGB888);
src = _contents.constData() + (minY * size + minX) * COLOR_BYTES;
int srcStride = size * COLOR_BYTES;
int destStride = width * COLOR_BYTES;
for (int y = 0; y < height; y++) {
memcpy(image.scanLine(y), src, destStride);
src += srcStride;
if (maxX >= minX) {
int width = maxX - minX + 1;
int height = maxY - minY + 1;
image = QImage(width, height, QImage::Format_RGB888);
src = _contents.constData() + (minY * size + minX) * COLOR_BYTES;
int srcStride = size * COLOR_BYTES;
int destStride = width * COLOR_BYTES;
for (int y = 0; y < height; y++) {
memcpy(image.scanLine(y), src, destStride);
src += srcStride;
}
}
} else {
int size = glm::sqrt((float)_contents.size());
@ -619,24 +665,24 @@ void HeightfieldData::writeDelta(Bitstream& out, const HeightfieldDataPointer& r
maxY = qMax(maxY, y);
}
}
int width = qMax(maxX - minX + 1, 0);
int height = qMax(maxY - minY + 1, 0);
image = QImage(width, height, QImage::Format_RGB888);
const uchar* lineSrc = (const uchar*)_contents.constData() + minY * size + minX;
for (int y = 0; y < height; y++) {
uchar* dest = image.scanLine(y);
for (const uchar* src = lineSrc, *end = src + width; src != end; src++) {
*dest++ = *src;
*dest++ = *src;
*dest++ = *src;
if (maxX >= minX) {
int width = qMax(maxX - minX + 1, 0);
int height = qMax(maxY - minY + 1, 0);
image = QImage(width, height, QImage::Format_RGB888);
const uchar* lineSrc = (const uchar*)_contents.constData() + minY * size + minX;
for (int y = 0; y < height; y++) {
uchar* dest = image.scanLine(y);
for (const uchar* src = lineSrc, *end = src + width; src != end; src++) {
*dest++ = *src;
*dest++ = *src;
*dest++ = *src;
}
lineSrc += size;
}
lineSrc += size;
}
}
QBuffer buffer(&reference->_encodedDelta);
buffer.open(QIODevice::WriteOnly);
image.setOffset(QPoint(minX + 1, minY + 1));
image.save(&buffer, "PNG");
reference->_encodedDelta = encodeHeightfieldImage(image);
reference->_deltaData = this;
}
out << reference->_encodedDelta.size();
@ -644,7 +690,7 @@ void HeightfieldData::writeDelta(Bitstream& out, const HeightfieldDataPointer& r
}
void HeightfieldData::read(Bitstream& in, int bytes, bool color) {
set(QImage::fromData(_encoded = in.readAligned(bytes)).convertToFormat(QImage::Format_RGB888), color);
set(decodeHeightfieldImage(_encoded = in.readAligned(bytes)).convertToFormat(QImage::Format_RGB888), color);
}
void HeightfieldData::set(const QImage& image, bool color) {