core: move renderSVGIcon() to qthelper.cpp

The renderIcon() function was used by the thumbnailer to
render SVG-based icons. Move it to the global qthelper.cpp
so that it can also be used by the statistics module.
Add "SVG" to the name to emphasize what it is used for.

For consistency also move the renderSVGIconWidth() function,
which renders to a fixed width, to qthelper.cpp

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

3 files changed, 33 insertions, 28 deletions

diff --git a/core/imagedownloader.cpp b/core/imagedownloader.cpp
index ea6011480..7ce7bde5f 100644
--- a/core/imagedownloader.cpp
+++ b/core/imagedownloader.cpp
@@ -11,7 +11,6 @@
 #include <QString>
 #include <QImageReader>
 #include <QDataStream>
-#include <QSvgRenderer>
 #include <QPainter>
 
 #include <QtConcurrent>
@@ -154,33 +153,11 @@ Thumbnailer::Thumbnail Thumbnailer::getHashedImage(const QString &filename, bool
 	return thumbnail;
 }
 
-static QImage renderIcon(const char *id, int size)
-{
-	QImage res(size, size, QImage::Format_RGB32);
-	res.fill(Qt::white);
-	QSvgRenderer svg{QString(id)};
-	QPainter painter(&res);
-	svg.render(&painter);
-	return res;
-}
-
-// As renderIcon, but render to a fixed width and scale height accordingly
-// and have a transparent background.
-static QImage renderIconWidth(const char *id, int size)
-{
-	QSvgRenderer svg{QString(id)};
-	QSize svgSize = svg.defaultSize();
-	QImage res(size, size * svgSize.height() / svgSize.width(), QImage::Format_ARGB32);
-	QPainter painter(&res);
-	svg.render(&painter);
-	return res;
-}
-
-Thumbnailer::Thumbnailer() : failImage(renderIcon(":filter-close", maxThumbnailSize())), // TODO: Don't misuse filter close icon
-			     dummyImage(renderIcon(":camera-icon", maxThumbnailSize())),
-			     videoImage(renderIcon(":video-icon", maxThumbnailSize())),
-			     videoOverlayImage(renderIconWidth(":video-overlay", maxThumbnailSize())),
-			     unknownImage(renderIcon(":unknown-icon", maxThumbnailSize()))
+Thumbnailer::Thumbnailer() : failImage(renderSVGIcon(":filter-close", maxThumbnailSize())), // TODO: Don't misuse filter close icon
+			     dummyImage(renderSVGIcon(":camera-icon", maxThumbnailSize())),
+			     videoImage(renderSVGIcon(":video-icon", maxThumbnailSize())),
+			     videoOverlayImage(renderSVGIconWidth(":video-overlay", maxThumbnailSize())),
+			     unknownImage(renderSVGIcon(":unknown-icon", maxThumbnailSize()))
 {
 	// Currently, we only process one image at a time. Stefan Fuchs reported problems when
 	// calculating multiple thumbnails at once and this hopefully helps.
diff --git a/core/qthelper.cpp b/core/qthelper.cpp
index 4db43458b..bebed3cf6 100644
--- a/core/qthelper.cpp
+++ b/core/qthelper.cpp
@@ -36,7 +36,9 @@
 #include <QFont>
 #include <QApplication>
 #include <QTextDocument>
+#include <QPainter>
 #include <QProgressDialog>	// TODO: remove with convertThumbnails()
+#include <QSvgRenderer>
 #include <cstdarg>
 #include <cstdint>
 #ifdef Q_OS_UNIX
@@ -1701,3 +1703,26 @@ extern "C" void emit_reset_signal()
 {
 	emit diveListNotifier.dataReset();
 }
+
+QImage renderSVGIcon(const char *id, int size)
+{
+	QImage res(size, size, QImage::Format_RGB32);
+	res.fill(Qt::white);
+	QSvgRenderer svg{QString(id)};
+	QPainter painter(&res);
+	svg.render(&painter);
+	return res;
+}
+
+// As renderSVGIcon(), but render to a fixed width and scale height accordingly
+// and have a transparent background.
+QImage renderSVGIconWidth(const char *id, int size)
+{
+	QSvgRenderer svg{QString(id)};
+	QSize svgSize = svg.defaultSize();
+	QImage res(size, size * svgSize.height() / svgSize.width(), QImage::Format_ARGB32);
+	QPainter painter(&res);
+	svg.render(&painter);
+	return res;
+}
+
diff --git a/core/qthelper.h b/core/qthelper.h
index c0457256b..152da7f89 100644
--- a/core/qthelper.h
+++ b/core/qthelper.h
@@ -21,6 +21,7 @@ enum watertypes {FRESHWATER, BRACKISHWATER, EN13319WATER, SALTWATER, DC_WATERTYP
 
 #include <QString>
 #include "core/gettextfromc.h"
+class QImage;
 
 QString weight_string(int weight_in_grams);
 QString distance_string(int distanceInMeters);
@@ -86,6 +87,8 @@ QString getUserAgent();
 QString printGPSCoords(const location_t *loc);
 std::vector<int> get_cylinder_map_for_remove(int count, int n);
 std::vector<int> get_cylinder_map_for_add(int count, int n);
+QImage renderSVGIcon(const char *id, int size);
+QImage renderSVGIconWidth(const char *id, int size);
 
 extern QString (*changesCallback)();
 void uiNotification(const QString &msg);