commit 3547de13279c3b80d5555a24e60c633c54469d86
parent 434c43f32a7ccff6d551cd4d7cb005d8bd2a42f5
Author: Nils Durner <durner@gnunet.org>
Date: Sat, 24 Jun 2006 16:34:56 +0000
thumbnail extractor based on Qt
Diffstat:
4 files changed, 287 insertions(+), 0 deletions(-)
diff --git a/AUTHORS b/AUTHORS
@@ -29,6 +29,7 @@ id3v2 - core team with Milan <milan@skoid.org>
hash - core team using GNU coreutils/textutils and GPL'ed RMD160 code.
translit - Nils Durner <durner@gnunet.org>
thumbnail - core team using GTK
+thumbnailqt - Nils Durner <durner@gnunet.org>
exiv2 - Andreas Huggel <ahuggel@gmx.net>
language - Roberto Cappuccio <roberto.cappuccio@gmail.com> (from libkat)
word - Ariya Hidayat <ariya@kde.org> and Sacha Fuentes <mandelman@iname.com>
diff --git a/configure.ac b/configure.ac
@@ -252,6 +252,78 @@ else
AM_CONDITIONAL(HAVE_GTK,false)
fi
+# check for Qt 4
+qt=0
+AC_LANG_PUSH([C++])
+AC_MSG_CHECKING(for Qt)
+AC_ARG_WITH(qt,
+ [ --with-qt=PFX Base of Qt installation],
+ [AC_MSG_RESULT([$with_qt])
+ case $with_qt in
+ no)
+ ;;
+ yes)
+ AC_CHECK_HEADERS(qpixmap.h,
+ AC_CHECK_LIB([QtGui4], [_ZN7QPixmap12defaultDepthEv],
+ qt=1))
+ ;;
+ *)
+ LDFLAGS="-L$with_qt/lib $LDFLAGS"
+ CPPFLAGS="-I$with_qt/include -I$with_qt/include/Qt $CPPFLAGS"
+ AC_CHECK_HEADERS(qpixmap.h,
+ AC_CHECK_LIB([QtGui4], [_ZN7QPixmap12defaultDepthEv],
+ EXT_LIB_PATH="-L$with_qt/lib $EXT_LIB_PATH"
+ qt=1))
+ ;;
+ esac
+ ],
+ [AC_MSG_RESULT([--with-qt not specified])
+ AC_CHECK_HEADERS(qpixmap.h,
+ AC_CHECK_LIB([QtGui4], [_ZN7QPixmap12defaultDepthEv],
+ qt=1))])
+
+if test x$qt != x0
+then
+ AC_DEFINE(HAVE_QT, 1, [We have Qt])
+fi
+AM_CONDITIONAL(HAVE_QT, test x$qt != x0)
+
+# check for Qt SVG module
+AC_MSG_CHECKING(for Qt SVG)
+AC_ARG_WITH(qt,
+ [ --with-qt=PFX Base of Qt installation],
+ [AC_MSG_RESULT([$with_qt])
+ case $with_qt in
+ no)
+ ;;
+ yes)
+ AC_CHECK_HEADERS(qsvgrenderer.h,
+ AC_CHECK_LIB([QtSvg4], [_ZN10QSvgWidgetD0Ev],
+ qt_svg=1))
+ ;;
+ *)
+ LDFLAGS="-L$with_qt/lib $LDFLAGS"
+ CPPFLAGS="-I$with_qt/include -I$with_qt/include/Qt $CPPFLAGS"
+ AC_CHECK_HEADERS(qsvgrenderer.h,
+ AC_CHECK_LIB([QtSvg4], [_ZN10QSvgWidgetD0Ev],
+ EXT_LIB_PATH="-L$with_qt/lib $EXT_LIB_PATH"
+ qt_svg=1))
+ ;;
+ esac
+ ],
+ [AC_MSG_RESULT([--with-qt not specified])
+ AC_CHECK_HEADERS(qsvgrenderer.h,
+ AC_CHECK_LIB([QtSvg4], [_ZN10QSvgWidgetD0Ev],
+ qt_svg=1))])
+
+if test x$qt_svg != x0
+then
+ AC_DEFINE(HAVE_QT_SVG, 1, [We have Qt SVG])
+fi
+AM_CONDITIONAL(HAVE_QT_SVG, test x$qt_svg != x0)
+
+
+AC_LANG_POP([C++])
printable=1
diff --git a/src/plugins/Makefile.am b/src/plugins/Makefile.am
@@ -9,6 +9,14 @@ thumbdir=thumbnail
endif
endif
+if HAVE_QT
+ thumbqt=libextractor_thumbnailqt.la
+endif
+
+if HAVE_QT_SVG
+ svgflags = -lQtSvg4
+endif
+
if HAVE_PRINTABLE
printdir=printable
endif
@@ -72,6 +80,7 @@ plugin_LTLIBRARIES = $(pdfplugin) \
libextractor_split.la \
libextractor_tar.la \
libextractor_tiff.la \
+ $(thumbqt) \
libextractor_translit.la \
libextractor_wav.la \
libextractor_zip.la
@@ -290,3 +299,10 @@ libextractor_translit_la_SOURCES = \
libextractor_translit_la_LDFLAGS = \
$(PLUGINFLAGS) $(retaincommand)
+libextractor_thumbnailqt_la_SOURCES = \
+ thumbnailextractorqt.cc
+libextractor_thumbnailqt_la_LIBADD = \
+ $(top_builddir)/src/main/libextractor.la
+libextractor_thumbnailqt_la_LDFLAGS = \
+ $(PLUGINFLAGS) $(retaincommand) -lQtCore4 -lQtGui4 $(svgflags)
+
diff --git a/src/plugins/thumbnailextractorqt.cc b/src/plugins/thumbnailextractorqt.cc
@@ -0,0 +1,198 @@
+/*
+ This file is part of libextractor.
+ (C) 2006 Vidyut Samanta and Christian Grothoff
+
+ libextractor is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 2, or (at your
+ option) any later version.
+
+ libextractor is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with libextractor; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * @file thumbnailextractorqt.cc
+ * @author Nils Durner
+ * @brief this extractor produces a binary (!) encoded
+ * thumbnail of images (using Qt).
+ */
+
+#include "platform.h"
+#include "extractor.h"
+#include <qpixmap.h>
+#include <qbytearray.h>
+#include <qbuffer.h>
+#include <qapplication.h>
+
+#ifdef HAVE_QT_SVG
+ #include <qsvgrenderer.h>
+ #include <qpainter.h>
+#endif
+
+#define THUMBSIZE 128
+
+extern "C"
+{
+
+QApplication *app;
+char *argv;
+
+void __attribute__ ((constructor)) thumnailextractorqt_init(void)
+{
+ int argc = 0;
+
+ argv = strdup("");
+ app = new QApplication(argc, &argv);
+}
+
+void __attribute__ ((destructor)) my_fini(void)
+{
+ delete app;
+ free(argv);
+}
+
+static EXTRACTOR_KeywordList * addKeyword(EXTRACTOR_KeywordType type,
+ char * keyword,
+ EXTRACTOR_KeywordList * next) {
+ EXTRACTOR_KeywordList * result;
+
+ if (keyword == NULL)
+ return next;
+ result = (EXTRACTOR_KeywordList *) malloc(sizeof(EXTRACTOR_KeywordList));
+ result->next = next;
+ result->keyword = keyword;
+ result->keywordType = type;
+ return result;
+}
+
+
+/* which mime-types maybe subjected to
+ the thumbnail extractor (ImageMagick
+ crashes and/or prints errors for bad
+ formats, so we need to be rather
+ conservative here) */
+static char * whitelist[] = {
+ "image/x-bmp",
+ "image/gif",
+ "image/jpeg",
+ "image/png",
+ "image/x-png",
+ "image/x-portable-bitmap",
+ "image/x-portable-graymap",
+ "image/x-portable-pixmap",
+ "image/x-xbitmap",
+ "image/x-xpixmap"
+ "image/x-xpm",
+#ifdef HAVE_QT_SVG
+ "image/svg+xml",
+#endif
+ NULL
+};
+
+struct EXTRACTOR_Keywords * libextractor_thumbnailqt_extract(const char * filename,
+ const unsigned char * data,
+ size_t size,
+ struct EXTRACTOR_Keywords * prev) {
+ QPixmap img;
+ QByteArray bytes;
+ QBuffer buffer;
+ unsigned long width;
+ unsigned long height;
+ char * binary;
+ const char * mime;
+ int j;
+ char * format;
+
+ /* if the mime-type of the file is not whitelisted
+ do not run the thumbnail extactor! */
+ mime = EXTRACTOR_extractLast(EXTRACTOR_MIMETYPE,
+ prev);
+ if (mime == NULL)
+ return prev;
+ j = 0;
+ while (whitelist[j] != NULL) {
+ if (0 == strcmp(whitelist[j], mime))
+ break;
+ j++;
+ }
+
+ if (whitelist[j] == NULL)
+ return prev;
+
+#ifdef HAVE_QT_SVG
+ if (strcmp(mime, "image/svg+xml") == 0)
+ {
+ /* Render SVG image */
+ QSvgRenderer svg;
+ QSize size;
+
+ if (! svg.load(QByteArray((const char *) data)))
+ return prev;
+
+ size = svg.defaultSize();
+ img = QPixmap(size);
+
+ QPainter painter(&img);
+ painter.setViewport(0, 0, size.width(), size.height());
+ painter.eraseRect(0, 0, size.width(), size.height());
+
+ svg.render(&painter);
+ }
+ else
+#endif
+ /* Load image */
+ img.loadFromData(data, size);
+
+ height = img.height();
+ width = img.width();
+ format = (char *) malloc(64);
+ snprintf(format,
+ 64,
+ "%ux%u",
+ (unsigned int) width,
+ (unsigned int) height);
+ prev = addKeyword(EXTRACTOR_SIZE,
+ format,
+ prev);
+ if (height == 0)
+ height = 1;
+ if (width == 0)
+ width = 1;
+
+ if (height > THUMBSIZE) {
+ width = width * THUMBSIZE / height;
+ height = THUMBSIZE;
+ }
+ if (width > THUMBSIZE) {
+ height = height * THUMBSIZE / width;
+ width = THUMBSIZE;
+ }
+
+ img = img.scaled(width, height, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+ buffer.setBuffer(&bytes);
+ buffer.open(QIODevice::WriteOnly);
+ img.save(&buffer, "PNG");
+
+ binary
+ = EXTRACTOR_binaryEncode((const unsigned char*) bytes.data(),
+ bytes.length());
+
+ if (binary == NULL)
+ return prev;
+
+ return addKeyword(EXTRACTOR_THUMBNAIL_DATA,
+ binary,
+ prev);
+}
+
+} // extern "C"
+
+/* end of thumbnailextractorqt.cc */
