Minimum Transparent window

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "deps/SFML"]
+	path = deps/SFML
+	url = git@github.com:SFML/SFML.git

GlosSITarget/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.7.2)
+
+project(
+  GlosSITarget
+  VERSION 1.0
+  LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+
+
+add_executable( GlosSITarget
+  main.cpp
+  SteamTarget.cpp
+)

GlosSITarget/GlosSITarget.vcxproj

@@ -72,15 +72,23 @@
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <LinkIncremental>true</LinkIncremental>
+    <ExternalIncludePath>..\deps\SFML\include;$(ExternalIncludePath)</ExternalIncludePath>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <LinkIncremental>false</LinkIncremental>
+    <ExternalIncludePath>..\deps\SFML\include;$(ExternalIncludePath)</ExternalIncludePath>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <LinkIncremental>true</LinkIncremental>
+    <ExternalIncludePath>..\deps\SFML\include;$(ExternalIncludePath)</ExternalIncludePath>
+    <LibraryPath>..\deps\SFML\out\build\x64-Debug\lib;$(LibraryPath)</LibraryPath>
+    <CopyLocalProjectReference>false</CopyLocalProjectReference>
+    <CopyLocalDeploymentContent>true</CopyLocalDeploymentContent>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <LinkIncremental>false</LinkIncremental>
+    <ExternalIncludePath>..\deps\SFML\include;$(ExternalIncludePath)</ExternalIncludePath>
+    <LibraryPath>..\deps\SFML\out\build\x64-Release\lib;$(LibraryPath)</LibraryPath>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
@@ -116,10 +124,12 @@
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
+      <LanguageStandard>stdcpp20</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>sfml-window-d.lib;sfml-system-d.lib;sfml-graphics-d.lib;dwmapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
@@ -130,6 +140,7 @@
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
+      <LanguageStandard>stdcpp20</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
@@ -141,9 +152,22 @@
   <ItemGroup>
     <ClCompile Include="main.cpp" />
     <ClCompile Include="SteamTarget.cpp" />
+    <ClCompile Include="TargetWindow.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="SteamTarget.h" />
+    <ClInclude Include="TargetWindow.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\deps\SFML\out\build\x64-Debug\lib\sfml-graphics-d-2.dll">
+      <DeploymentContent Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</DeploymentContent>
+    </None>
+    <None Include="..\deps\SFML\out\build\x64-Debug\lib\sfml-system-d-2.dll">
+      <DeploymentContent Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</DeploymentContent>
+    </None>
+    <None Include="..\deps\SFML\out\build\x64-Debug\lib\sfml-window-d-2.dll">
+      <DeploymentContent Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</DeploymentContent>
+    </None>
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

GlosSITarget/GlosSITarget.vcxproj.filters

@@ -21,10 +21,21 @@
     <ClCompile Include="SteamTarget.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="TargetWindow.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="SteamTarget.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="TargetWindow.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\deps\SFML\out\build\x64-Debug\lib\sfml-system-d-2.dll" />
+    <None Include="..\deps\SFML\out\build\x64-Debug\lib\sfml-window-d-2.dll" />
+    <None Include="..\deps\SFML\out\build\x64-Debug\lib\sfml-graphics-d-2.dll" />
   </ItemGroup>
 </Project>

GlosSITarget/SteamTarget.cpp

@@ -2,10 +2,15 @@
 
 #include <iostream>
 
-SteamTarget::SteamTarget(int argc, char* argv[]) {
+SteamTarget::SteamTarget(int argc, char* argv[]) : window_([this] { run_ = false; }) {
 
 }
 
 int SteamTarget::run() {
+    run_ = true;
+    window_.setFpsLimit(90);
+    while (run_) {
+        window_.update();
+    }
     return 1;
-}
+}

GlosSITarget/SteamTarget.h

@@ -1,8 +1,15 @@
 #pragma once
+
+#include "TargetWindow.h"
+
 class SteamTarget
 {
 public:
     explicit SteamTarget(int argc, char* argv[]);
     int run();
+
+private:
+    bool run_ = false;
+    TargetWindow window_;
 };
 

GlosSITarget/TargetWindow.cpp

@@ -0,0 +1,64 @@
+#include "TargetWindow.h"
+
+#include <utility>
+
+#include <SFML/Window/Event.hpp>
+
+#ifdef _WIN32
+#include <Windows.h>
+#include <dwmapi.h>
+#endif
+
+
+TargetWindow::TargetWindow(std::function<void()> on_close) : on_close_(std::move(on_close))
+{
+	window_.create(sf::VideoMode::getDesktopMode(), "GlosSITarget", sf::Style::None);
+    window_.setActive(true);
+#ifdef _WIN32
+	HWND hwnd = window_.getSystemHandle();
+	MARGINS margins;
+	margins.cxLeftWidth = -1;
+	DwmExtendFrameIntoClientArea(hwnd, &margins);
+
+	// window clickthough.
+	SetWindowLong(hwnd, GWL_EXSTYLE, WS_EX_LAYERED | WS_EX_TRANSPARENT | WS_EX_TOPMOST);
+
+	// always on top
+	SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
+
+
+#endif
+}
+
+void TargetWindow::setFpsLimit(unsigned int fps_limit)
+{
+	window_.setFramerateLimit(fps_limit);
+}
+
+void TargetWindow::setClickThrough(bool click_through)
+{
+    
+}
+
+
+void TargetWindow::update()
+{
+	sf::Event event{};
+	while (window_.pollEvent(event))
+	{
+		if (event.type == sf::Event::Closed)
+		{
+			window_.close();
+			on_close_();
+		}
+	}
+	window_.clear(sf::Color::Transparent);
+	//window_.clear(sf::Color(255,0,0,1));
+	window_.display();
+}
+
+void TargetWindow::close()
+{
+	window_.close();
+	on_close_();
+}

GlosSITarget/TargetWindow.h

@@ -0,0 +1,20 @@
+#pragma once
+#include <functional>
+
+#include <SFML/Graphics/RenderWindow.hpp>
+
+class TargetWindow
+{
+public:
+    explicit TargetWindow(std::function<void()> on_close = [](){});
+
+    void setFpsLimit(unsigned int fps_limit);
+    void setClickThrough(bool click_through);
+    void update();
+    void close();
+
+private:
+    const std::function<void()> on_close_;
+    sf::RenderWindow window_;
+};
+

GlosSITarget/main.cpp

@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 #ifdef _WIN32
+#define NOMINMAX
 #include <Windows.h>
 #endif
 

deps/SFML

@@ -0,0 +1 @@
+Subproject commit 3b1ff125b06e010ec1acf1bbec113adc0c8c57cd