Add a tool to take an inverted screenshot (#1849)

* Add invert tool to build commands

* Add icons for invert tool

* Integrate invert tool

* Add shortcut for invert tool

* Add invert tool

* Add translation for invert tool

* Run clang-format

* Update tool to invert a region instead of everything

* Update shortcut for invert tool

* Update button order of inverter and counter

* Update translations for invert tool

* Run clang-format

* Revert "Update translations for invert tool"

This reverts commit c1fd5a162be6c64b26790d53eab3749b3a124bcf.

* Revert "Add translation for invert tool"

This reverts commit b0c1da5f36e844fa8b5f1492f5f507d85bb7aa7b.

* Update drawSearchArea to match pixelate

* Update invert icon to one from Material Design

Co-authored-by: crackcat <>

data/graphics.qrc

@@ -78,5 +78,7 @@
         <file>img/material/white/plus.svg</file>
         <file>img/material/black/minus.svg</file>
         <file>img/material/white/minus.svg</file>
+        <file>img/material/black/invert.svg</file>
+        <file>img/material/white/invert.svg</file>
     </qresource>
-</RCC>
+</RCC>

data/img/material/black/invert.svg

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1"  width="24" height="24" viewBox="0 0 24 24">
+   <path fill="#000000" d="M12,19.58V19.58C10.4,19.58 8.89,18.96 7.76,17.83C6.62,16.69 6,15.19 6,13.58C6,12 6.62,10.47 7.76,9.34L12,5.1M17.66,7.93L12,2.27V2.27L6.34,7.93C3.22,11.05 3.22,16.12 6.34,19.24C7.9,20.8 9.95,21.58 12,21.58C14.05,21.58 16.1,20.8 17.66,19.24C20.78,16.12 20.78,11.05 17.66,7.93Z" />
+</svg>

data/img/material/white/invert.svg

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1"  width="24" height="24" viewBox="0 0 24 24">
+   <path fill="#ffffff" d="M12,19.58V19.58C10.4,19.58 8.89,18.96 7.76,17.83C6.62,16.69 6,15.19 6,13.58C6,12 6.62,10.47 7.76,9.34L12,5.1M17.66,7.93L12,2.27V2.27L6.34,7.93C3.22,11.05 3.22,16.12 6.34,19.24C7.9,20.8 9.95,21.58 12,21.58C14.05,21.58 16.1,20.8 17.66,19.24C20.78,16.12 20.78,11.05 17.66,7.93Z" />
+</svg>

src/CMakeLists.txt

@@ -148,6 +148,7 @@ target_include_directories(
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/tools/rectangle>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/tools/redo>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/tools/save>
+         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/tools/invert>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/tools/selection>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/tools/sizeindicator>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/tools/text>

src/tools/CMakeLists.txt

@@ -37,6 +37,7 @@ target_sources(
 target_sources(flameshot PRIVATE rectangle/rectangletool.h rectangle/rectangletool.cpp)
 target_sources(flameshot PRIVATE redo/redotool.h redo/redotool.cpp)
 target_sources(flameshot PRIVATE save/savetool.h save/savetool.cpp)
+target_sources(flameshot PRIVATE invert/inverttool.h invert/inverttool.cpp)
 target_sources(flameshot PRIVATE selection/selectiontool.h selection/selectiontool.cpp)
 target_sources(flameshot PRIVATE sizeindicator/sizeindicatortool.h sizeindicator/sizeindicatortool.cpp)
 target_sources(

src/tools/capturetool.h

@@ -27,13 +27,14 @@ enum class ToolType
     RECTANGLE,
     REDO,
     SAVE,
+    INVERT,
     SELECTION,
     SIZEINDICATOR,
     TEXT,
     UNDO,
     UPLOAD,
     SIZEINCREASE,
-    SIZEDECREASE
+    SIZEDECREASE,
 };
 
 class CaptureTool : public QObject

src/tools/invert/inverttool.cpp

@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2017-2019 Alejandro Sirgo Rica & Contributors
+
+#include "inverttool.h"
+#include <QApplication>
+#include <QGraphicsBlurEffect>
+#include <QGraphicsPixmapItem>
+#include <QGraphicsScene>
+#include <QImage>
+#include <QPainter>
+#include <QPixmap>
+
+InvertTool::InvertTool(QObject* parent)
+  : AbstractTwoPointTool(parent)
+{}
+
+QIcon InvertTool::icon(const QColor& background, bool inEditor) const
+{
+    Q_UNUSED(inEditor)
+    return QIcon(iconPath(background) + "invert.svg");
+}
+
+QString InvertTool::name() const
+{
+    return tr("Invert");
+}
+
+ToolType InvertTool::type() const
+{
+    return ToolType::INVERT;
+}
+
+QString InvertTool::description() const
+{
+    return tr("Set Inverter as the paint tool");
+}
+
+CaptureTool* InvertTool::copy(QObject* parent)
+{
+    auto* tool = new InvertTool(parent);
+    copyParams(this, tool);
+    return tool;
+}
+
+void InvertTool::process(QPainter& painter, const QPixmap& pixmap)
+{
+    QPoint p0 = points().first;
+    QPoint p1 = points().second;
+    QRect selection = QRect(p0, p1).normalized();
+
+    // Invert selection
+    QPixmap inv = pixmap.copy(selection);
+    QImage img = inv.toImage();
+    img.invertPixels();
+
+    painter.drawImage(selection, img);
+}
+
+void InvertTool::drawSearchArea(QPainter& painter, const QPixmap& pixmap)
+{
+    Q_UNUSED(pixmap)
+    painter.fillRect(std::min(points().first.x(), points().second.x()),
+                     std::min(points().first.y(), points().second.y()),
+                     std::abs(points().first.x() - points().second.x()),
+                     std::abs(points().first.y() - points().second.y()),
+                     QBrush(Qt::black));
+}
+
+void InvertTool::paintMousePreview(QPainter& painter,
+                                   const CaptureContext& context)
+{
+    Q_UNUSED(context)
+    Q_UNUSED(painter)
+}
+
+void InvertTool::pressed(const CaptureContext& context)
+{
+    Q_UNUSED(context)
+}
+
+void InvertTool::drawObjectSelection(QPainter& painter)
+{
+    QRect rect = QRect(std::min(points().first.x(), points().second.x()),
+                       std::min(points().first.y(), points().second.y()),
+                       std::abs(points().first.x() - points().second.x()),
+                       std::abs(points().first.y() - points().second.y()));
+    drawObjectSelectionRect(painter, rect);
+}

src/tools/invert/inverttool.h

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2017-2019 Alejandro Sirgo Rica & Contributors
+
+#pragma once
+
+#include "src/tools/abstracttwopointtool.h"
+
+class InvertTool : public AbstractTwoPointTool
+{
+    Q_OBJECT
+public:
+    explicit InvertTool(QObject* parent = nullptr);
+
+    QIcon icon(const QColor& background, bool inEditor) const override;
+    QString name() const override;
+    QString description() const override;
+
+    CaptureTool* copy(QObject* parent = nullptr) override;
+    void process(QPainter& painter, const QPixmap& pixmap) override;
+    void drawSearchArea(QPainter& painter, const QPixmap& pixmap) override;
+    void paintMousePreview(QPainter& painter,
+                           const CaptureContext& context) override;
+    void drawObjectSelection(QPainter& painter) override;
+
+protected:
+    ToolType type() const override;
+
+public slots:
+    void pressed(const CaptureContext& context) override;
+};

src/tools/toolfactory.cpp

@@ -8,6 +8,7 @@
 #include "copy/copytool.h"
 #include "exit/exittool.h"
 #include "imgur/imguruploadertool.h"
+#include "invert/inverttool.h"
 #include "launcher/applaunchertool.h"
 #include "line/linetool.h"
 #include "marker/markertool.h"
@@ -68,6 +69,9 @@ CaptureTool* ToolFactory::CreateTool(CaptureToolButton::ButtonType t,
         case CaptureToolButton::TYPE_SAVE:
             tool = new SaveTool(parent);
             break;
+        case CaptureToolButton::TYPE_INVERT:
+            tool = new InvertTool(parent);
+            break;
         case CaptureToolButton::TYPE_SELECTION:
             tool = new SelectionTool(parent);
             break;

src/utils/configshortcuts.cpp

@@ -104,6 +104,8 @@ const QKeySequence& ConfigShortcuts::captureShortcutDefault(
         m_ks = QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_Z);
     } else if (buttonType == "TYPE_TEXT") {
         m_ks = QKeySequence(Qt::Key_T);
+    } else if (buttonType == "TYPE_INVERT") {
+        m_ks = QKeySequence(Qt::Key_I);
     } else if (buttonType == "TYPE_TOGGLE_PANEL") {
         m_ks = QKeySequence(Qt::Key_Space);
     } else if (buttonType == "TYPE_RESIZE_LEFT") {