mirror of
https://github.com/tumic0/QtPBFImagePlugin.git
synced 2024-11-24 03:35:54 +01:00
105 lines
2.2 KiB
C++
105 lines
2.2 KiB
C++
#include <QImage>
|
|
#include <QIODevice>
|
|
#include <QtEndian>
|
|
#include <QDebug>
|
|
#include "gzip.h"
|
|
#include "tile.h"
|
|
#include "style.h"
|
|
#include "pbfhandler.h"
|
|
|
|
|
|
#define TILE_SIZE 512
|
|
|
|
#define GZIP_MAGIC 0x1F8B0800
|
|
#define GZIP_MAGIC_MASK 0xFFFFFF00
|
|
#define PBF_MAGIC 0x1A000000
|
|
#define PBF_MAGIC_MASK 0xFF000000
|
|
|
|
static bool isMagic(quint32 magic, quint32 mask, quint32 value)
|
|
{
|
|
return ((qFromBigEndian(value) & mask) == magic);
|
|
}
|
|
|
|
static bool isGZIPPBF(quint32 magic)
|
|
{
|
|
return isMagic(GZIP_MAGIC, GZIP_MAGIC_MASK, magic);
|
|
}
|
|
|
|
static bool isPlainPBF(quint32 magic)
|
|
{
|
|
return isMagic(PBF_MAGIC, PBF_MAGIC_MASK, magic);
|
|
}
|
|
|
|
|
|
bool PBFHandler::canRead() const
|
|
{
|
|
if (canRead(device())) {
|
|
setFormat("pbf");
|
|
return true;
|
|
} else
|
|
return false;
|
|
}
|
|
|
|
bool PBFHandler::canRead(QIODevice *device)
|
|
{
|
|
quint32 magic;
|
|
qint64 size = device->peek((char*)&magic, sizeof(magic));
|
|
if (size != sizeof(magic))
|
|
return false;
|
|
|
|
return (isGZIPPBF(magic) || isPlainPBF(magic));
|
|
}
|
|
|
|
bool PBFHandler::read(QImage *image)
|
|
{
|
|
quint32 magic;
|
|
if (device()->peek((char*)&magic, sizeof(magic)) != sizeof(magic))
|
|
return false;
|
|
|
|
QByteArray ba;
|
|
if (isGZIPPBF(magic))
|
|
ba = Gzip::uncompress(device()->readAll());
|
|
else if (isPlainPBF(magic))
|
|
ba = device()->readAll();
|
|
if (ba.isNull())
|
|
return false;
|
|
vector_tile::Tile data;
|
|
if (!data.ParseFromArray(ba.constData(), ba.size())) {
|
|
qCritical() << "Invalid PBF data";
|
|
return false;
|
|
}
|
|
|
|
bool ok;
|
|
int zoom = format().toInt(&ok);
|
|
|
|
QSize size = _scaledSize.isValid()
|
|
? _scaledSize : QSize(TILE_SIZE, TILE_SIZE);
|
|
QPointF scale = _scaledSize.isValid()
|
|
? QPointF((qreal)_scaledSize.width() / TILE_SIZE,
|
|
(qreal)_scaledSize.height() / TILE_SIZE) : QPointF(1.0, 1.0);
|
|
*image = QImage(size, QImage::Format_ARGB32_Premultiplied);
|
|
Tile tile(image, ok ? zoom : -1, scale);
|
|
|
|
_style->render(data, tile);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool PBFHandler::supportsOption(ImageOption option) const
|
|
{
|
|
return (option == Size || option == ScaledSize);
|
|
}
|
|
|
|
|
|
void PBFHandler::setOption(QImageIOHandler::ImageOption option,
|
|
const QVariant &value)
|
|
{
|
|
if (option == ScaledSize)
|
|
_scaledSize = value.toSize();
|
|
}
|
|
|
|
QVariant PBFHandler::option(ImageOption option) const
|
|
{
|
|
return (option == Size) ? QSize(TILE_SIZE, TILE_SIZE) : QVariant();
|
|
}
|