pixelsampler: added pixel sampler panel

When visible, this panel will show the current reference and display transformed
color under the cursor of any viewer.

app/panel/pixelsampler/CMakeLists.txt

@@ -0,0 +1,22 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2019 Olive Team
+#
+# This program 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 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(OLIVE_SOURCES
+  ${OLIVE_SOURCES}
+  panel/pixelsampler/pixelsamplerpanel.h
+  panel/pixelsampler/pixelsamplerpanel.cpp
+  PARENT_SCOPE
+)

app/panel/pixelsampler/pixelsamplerpanel.cpp

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+#include "pixelsamplerpanel.h"
+
+PixelSamplerPanel::PixelSamplerPanel(QWidget *parent) :
+  PanelWidget(parent)
+{
+  // FIXME: This won't work if there's ever more than one of this panel
+  setObjectName("ProjectPanel");
+
+  sampler_widget_ = new ManagedPixelSamplerWidget();
+  setWidget(sampler_widget_);
+
+  Retranslate();
+}
+
+void PixelSamplerPanel::SetValues(const Color &reference, const Color &display)
+{
+  sampler_widget_->SetValues(reference, display);
+}
+
+void PixelSamplerPanel::Retranslate()
+{
+  SetTitle(tr("Pixel Sampler"));
+}

app/panel/pixelsampler/pixelsamplerpanel.h

@@ -0,0 +1,23 @@
+#ifndef PIXELSAMPLERPANEL_H
+#define PIXELSAMPLERPANEL_H
+
+#include "widget/panel/panel.h"
+#include "widget/viewer/pixelsamplerwidget.h"
+
+class PixelSamplerPanel : public PanelWidget
+{
+  Q_OBJECT
+public:
+  PixelSamplerPanel(QWidget* parent = nullptr);
+
+public slots:
+  void SetValues(const Color& reference, const Color& display);
+
+private:
+  virtual void Retranslate() override;
+
+  ManagedPixelSamplerWidget* sampler_widget_;
+
+};
+
+#endif // PIXELSAMPLERPANEL_H