qcam: Add additional command line option to select the renderer type

Add new option "--renderer=qt|gles" to select the renderer type,
"--renderer=gles" to accelerate format conversion and rendering
"--renderer=qt" is the original Qt rendering.

Signed-off-by: Show Liu <show.liu@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/qcam/main.cpp

@@ -33,6 +33,9 @@ OptionsParser::Options parseOptions(int argc, char *argv[])
 			 ArgumentRequired, "camera");
 	parser.addOption(OptHelp, OptionNone, "Display this help message",
 			 "help");
+	parser.addOption(OptRenderer, OptionString,
+			 "Choose the renderer type {qt,gles} (default: qt)",
+			 "renderer", ArgumentRequired, "renderer");
 	parser.addOption(OptStream, &streamKeyValue,
 			 "Set configuration of a camera stream", "stream", true);
 

src/qcam/main_window.cpp

@@ -28,6 +28,9 @@
 #include <libcamera/version.h>
 
 #include "dng_writer.h"
+#ifndef QT_NO_OPENGL
+#include "viewfinder_gl.h"
+#endif
 #include "viewfinder_qt.h"
 
 using namespace libcamera;
@@ -106,11 +109,32 @@ MainWindow::MainWindow(CameraManager *cm, const OptionsParser::Options &options)
 	setWindowTitle(title_);
 	connect(&titleTimer_, SIGNAL(timeout()), this, SLOT(updateTitle()));
 
-	ViewFinderQt *viewfinder = new ViewFinderQt(this);
+	/* Renderer type Qt or GLES, select Qt by default. */
-	connect(viewfinder, &ViewFinderQt::renderComplete,
+	std::string renderType = "qt";
-		this, &MainWindow::queueRequest);
+	if (options_.isSet(OptRenderer))
-	viewfinder_ = viewfinder;
+		renderType = options_[OptRenderer].toString();
-	setCentralWidget(viewfinder);
+
+	if (renderType == "qt") {
+		ViewFinderQt *viewfinder = new ViewFinderQt(this);
+		connect(viewfinder, &ViewFinderQt::renderComplete,
+			this, &MainWindow::queueRequest);
+		viewfinder_ = viewfinder;
+		setCentralWidget(viewfinder);
+#ifndef QT_NO_OPENGL
+	} else if (renderType == "gles") {
+		ViewFinderGL *viewfinder = new ViewFinderGL(this);
+		connect(viewfinder, &ViewFinderGL::renderComplete,
+			this, &MainWindow::queueRequest);
+		viewfinder_ = viewfinder;
+		setCentralWidget(viewfinder);
+#endif
+	} else {
+		qWarning() << "Invalid render type"
+			   << QString::fromStdString(renderType);
+		quit();
+		return;
+	}
+
 	adjustSize();
 
 	/* Hotplug/unplug support */

src/qcam/main_window.h

@@ -37,6 +37,7 @@ class HotplugEvent;
 enum {
 	OptCamera = 'c',
 	OptHelp = 'h',
+	OptRenderer = 'r',
 	OptStream = 's',
 };