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kimgio: implement size option for tiff plugin

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Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2023-05-22 08:04:06 +03:00
parent b3e9998d8c
commit 5365b4788e
2 changed files with 79 additions and 0 deletions
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76
kimgio/tiff.cpp
View file

@ -19,6 +19,7 @@
#include "tiff.h"
#include <QImage>
#include <QVariant>
#include <kdebug.h>
#include <stdio.h>
@ -348,6 +349,81 @@ QByteArray TIFFHandler::name() const
return s_tiffpluginformat;
}
bool TIFFHandler::supportsOption(QImageIOHandler::ImageOption option) const
{
switch (option) {
case QImageIOHandler::Size: {
return true;
}
default: {
return false;
}
}
Q_UNREACHABLE();
}
QVariant TIFFHandler::option(QImageIOHandler::ImageOption option) const
{
switch (option) {
case QImageIOHandler::Size: {
const qint64 devicepos = device()->pos();
s_tifferrorhandler = TIFFSetErrorHandler(tiff_error_handler);
s_tiffwarninghandler = TIFFSetWarningHandler(tiff_warning_handler);
TIFF* tiffclient = TIFFClientOpen(
"TIFFHandler", "r",
device(),
tiff_read_proc,
tiff_write_proc,
tiff_seek_proc,
tiff_close_proc,
tiff_size_proc,
tiff_mapfile_proc,
tiff_unmapfile_proc
);
if (!Q_UNLIKELY(tiffclient)) {
kWarning() << "Could not open client";
TIFFSetErrorHandler(s_tifferrorhandler);
TIFFSetWarningHandler(s_tiffwarninghandler);
return false;
}
uint32_t tiffwidth = 0;
int tiffresult = TIFFGetField(tiffclient, TIFFTAG_IMAGEWIDTH, &tiffwidth);
if (Q_UNLIKELY(tiffresult != 1)) {
kWarning() << "Could not get image width";
TIFFClose(tiffclient);
TIFFSetErrorHandler(s_tifferrorhandler);
TIFFSetWarningHandler(s_tiffwarninghandler);
device()->seek(devicepos);
return false;
}
uint32_t tiffheight = 0;
tiffresult = TIFFGetField(tiffclient, TIFFTAG_IMAGELENGTH, &tiffheight);
if (Q_UNLIKELY(tiffresult != 1)) {
kWarning() << "Could not get image length";
TIFFClose(tiffclient);
TIFFSetErrorHandler(s_tifferrorhandler);
TIFFSetWarningHandler(s_tiffwarninghandler);
device()->seek(devicepos);
return false;
}
TIFFClose(tiffclient);
TIFFSetErrorHandler(s_tifferrorhandler);
TIFFSetWarningHandler(s_tiffwarninghandler);
device()->seek(devicepos);
return QVariant(QSize(tiffwidth, tiffheight));
}
default: {
return QVariant();
}
}
Q_UNREACHABLE();
}
bool TIFFHandler::canRead(QIODevice *device)
{
if (Q_UNLIKELY(!device)) {

3
kimgio/tiff.h
View file

@ -34,6 +34,9 @@ public:
QByteArray name() const final;
bool supportsOption(QImageIOHandler::ImageOption option) const final;
QVariant option(QImageIOHandler::ImageOption option) const final;
static bool canRead(QIODevice *device);
};