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#include <QtCore/QtEndian>
#include <QtCore/QVariant>
#include <QtCore/QDebug>
#include <QtGui/QImage>
#include "msolimageiohandler.h"
static const int header_size = 16;
namespace
{
static inline uchar encode_color(QRgb c)
{
return (qRed(c) & 0xC0) | ((qBlue(c) & 0xC0) >> 2) | ((qGreen(c) & 0xC0) >> 4) | 3;
}
static inline QRgb decode_color(uchar p, uchar a = 255)
{
return qRgba(p & 0xC0, (p & 0x30) << 2, (p & 0x0C) << 4, a);
}
}
MSOLImageIOHandler::MSOLImageIOHandler() : QImageIOHandler()
{
}
bool MSOLImageIOHandler::canRead() const
{
char header[header_size];
if (device()->peek(header, header_size) != header_size) {
return false;
}
return strncmp(&header[0], "MSOL ", 6) == 0;
}
bool MSOLImageIOHandler::read(QImage *image)
{
QIODevice *dev = device();
uchar header[header_size];
if (dev->read(reinterpret_cast<char*>(header), header_size) != header_size) {
return false;
}
if (strncmp(reinterpret_cast<char*>(&header[0]), "MSOL ", 6) != 0) {
return false;
}
const bool alpha = header[6];
const int width = qFromLittleEndian<quint16>(&header[8]);
const int height = qFromLittleEndian<quint16>(&header[10]);
const int pixel_size = alpha ? 2 : 1;
const int line_size = width * pixel_size;
if (alpha) {
*image = QImage(width, height, QImage::Format_ARGB32);
} else {
*image = QImage(width, height, QImage::Format_RGB32);
}
Q_ASSERT(image->depth() == sizeof(QRgb) * 8);
for (int y = 0; y < height; y++) {
QRgb *dst = reinterpret_cast<QRgb*>(image->scanLine(y));
uchar src[line_size];
if (dev->read(reinterpret_cast<char*>(src), line_size) != line_size) {
qDebug() << "Could not read image line" << y;
return false;
}
for (int x = 0; x < width; x++) {
if (alpha) {
dst[x] = decode_color(src[x * pixel_size]);
} else {
dst[x] = decode_color(src[x * pixel_size], src[(x * pixel_size) + 1]);
}
}
}
return true;
}
bool MSOLImageIOHandler::write(const QImage &image)
{
QIODevice *dev = device();
const int height = image.height();
const int width = image.width();
const bool alpha = image.hasAlphaChannel();
const int pixel_size = alpha ? 2 : 1;
const int line_size = width * pixel_size;
QImage img = image.convertToFormat(alpha ? QImage::Format_ARGB32 : QImage::Format_RGB32);
uchar header[header_size] = { 0 };
strcpy(reinterpret_cast<char*>(&header[0]), "MSOL ");
if (alpha) header[6] = 0x80;
header[7] = 8;
qToLittleEndian<quint16>(width, &header[8]);
qToLittleEndian<quint16>(height, &header[10]);
if (dev->write(reinterpret_cast<char*>(header), header_size) != header_size) {
qDebug() << "Could not write header";
return false;
}
Q_ASSERT(img.depth() == sizeof(QRgb) * 8);
for (int y = 0; y < height; y++) {
uchar dst[line_size];
const QRgb *src = reinterpret_cast<const QRgb*>(img.constScanLine(y));
for (int x = 0; x < width; x++) {
dst[x * pixel_size] = encode_color(src[x]);
if (alpha) {
dst[(x * pixel_size) + 1] = qAlpha(src[x]);
}
}
if (dev->write(reinterpret_cast<char*>(dst), line_size) != line_size) {
qDebug() << "Could not write image line " << y;
return false;
}
}
return true;
}
bool MSOLImageIOHandler::supportsOption(ImageOption option) const
{
switch (option) {
case Size:
return true;
default:
return false;
}
}
QVariant MSOLImageIOHandler::option(ImageOption option) const
{
char header[header_size];
switch (option) {
case Size:
if (device()->peek(header, header_size) == header_size) {
const QSize size(qFromLittleEndian<quint16>(reinterpret_cast<uchar*>(&header[8])),
qFromLittleEndian<quint16>(reinterpret_cast<uchar*>(&header[10])));
return QVariant::fromValue(size);
} else {
qDebug() << "Cannot read from device: " << device()->errorString();
}
default:
break;
}
return QVariant();
}
void MSOLImageIOHandler::setOption(ImageOption option, const QVariant &value)
{
}
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