Merge commit 'f2ecefb7ee9b9e6c5daac9f44fe40ebdccbb1c76' into 1.6

Source/Editor/Utilities/EditorScene.cpp

@@ -20,4 +20,6 @@ void EditorScene::Update()
         e.Call();
     for (auto& e : Ticking.FixedUpdate.Ticks)
         e.Call();
+    for (auto& e : Ticking.LateFixedUpdate.Ticks)
+        e.Call();
 }

Source/Editor/Utilities/ScreenUtilities.cpp

@@ -0,0 +1,130 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#include "ScreenUtilities.h"
+#include "Engine/Core/Math/Vector2.h"
+#include "Engine/Core/Delegate.h"
+#include "Engine/Core/Log.h"
+#include "Engine/Profiler/ProfilerCPU.h"
+
+Delegate<Color32> ScreenUtilities::PickColorDone;
+
+#if PLATFORM_WINDOWS
+
+#include <Windows.h>
+
+#pragma comment(lib, "Gdi32.lib")
+
+static HHOOK MouseCallbackHook;
+
+LRESULT CALLBACK OnScreenUtilsMouseCallback(_In_ int nCode, _In_ WPARAM wParam, _In_ LPARAM lParam)
+{
+    if (nCode >= 0 && wParam == WM_LBUTTONDOWN)
+    {
+        UnhookWindowsHookEx(MouseCallbackHook);
+
+        // Push event with the picked color
+        const Float2 cursorPos = Platform::GetMousePosition();
+        const Color32 colorPicked = ScreenUtilities::GetColorAt(cursorPos);
+        ScreenUtilities::PickColorDone(colorPicked);
+        return 1;
+    }
+    return CallNextHookEx(NULL, nCode, wParam, lParam);
+}
+
+Color32 ScreenUtilities::GetColorAt(const Float2& pos)
+{
+    PROFILE_CPU();
+    HDC deviceContext = GetDC(NULL);
+    COLORREF color = GetPixel(deviceContext, (int)pos.X, (int)pos.Y);
+    ReleaseDC(NULL, deviceContext);
+    return Color32(GetRValue(color), GetGValue(color), GetBValue(color), 255);
+}
+
+void ScreenUtilities::PickColor()
+{
+    MouseCallbackHook = SetWindowsHookEx(WH_MOUSE_LL, OnScreenUtilsMouseCallback, NULL, NULL);
+    if (MouseCallbackHook == NULL)
+    {
+        LOG(Warning, "Failed to set mouse hook.");
+        LOG(Warning, "Error: {0}", GetLastError());
+    }
+}
+
+#elif PLATFORM_LINUX
+
+#include "Engine/Platform/Linux/LinuxPlatform.h"
+#include "Engine/Platform/Linux/IncludeX11.h"
+
+Color32 ScreenUtilities::GetColorAt(const Float2& pos)
+{
+    X11::XColor color;
+    
+    X11::Display* display = (X11::Display*) LinuxPlatform::GetXDisplay();
+    int defaultScreen = X11::XDefaultScreen(display);
+
+    X11::XImage* image;
+    image = X11::XGetImage(display, X11::XRootWindow(display, defaultScreen), (int)pos.X, (int)pos.Y, 1, 1, AllPlanes, XYPixmap);
+    color.pixel = XGetPixel(image, 0, 0);
+    X11::XFree(image);
+
+    X11::XQueryColor(display, X11::XDefaultColormap(display, defaultScreen), &color);
+
+    Color32 outputColor;
+    outputColor.R = color.red / 256;
+    outputColor.G = color.green / 256;
+    outputColor.B = color.blue / 256;
+    return outputColor;
+}
+
+void OnScreenUtilsXEventCallback(void* eventPtr)
+{
+    X11::XEvent* event = (X11::XEvent*) eventPtr;
+    X11::Display* display = (X11::Display*)LinuxPlatform::GetXDisplay();
+    if (event->type == ButtonPress)
+    {
+        const Float2 cursorPos = Platform::GetMousePosition();
+        const Color32 colorPicked = ScreenUtilities::GetColorAt(cursorPos);
+        X11::XUngrabPointer(display, CurrentTime);
+        ScreenUtilities::PickColorDone(colorPicked);
+        LinuxPlatform::xEventRecieved.Unbind(OnScreenUtilsXEventCallback);
+    }
+}
+
+void ScreenUtilities::PickColor()
+{
+    PROFILE_CPU();
+    X11::Display* display = (X11::Display*) LinuxPlatform::GetXDisplay();
+    X11::Window rootWindow = X11::XRootWindow(display, X11::XDefaultScreen(display));
+
+    X11::Cursor cursor = XCreateFontCursor(display, 130);
+    int grabbedPointer = X11::XGrabPointer(display, rootWindow, 0,  ButtonPressMask, GrabModeAsync, GrabModeAsync, rootWindow, cursor, CurrentTime);
+    if (grabbedPointer != GrabSuccess)
+    {
+        LOG(Error, "Failed to grab cursor for events.");
+        X11::XFreeCursor(display, cursor);
+        return;
+    }
+
+    X11::XFreeCursor(display, cursor);
+    LinuxPlatform::xEventRecieved.Bind(OnScreenUtilsXEventCallback);
+}
+
+#elif PLATFORM_MAC
+
+#include <Cocoa/Cocoa.h>
+#include <AppKit/AppKit.h>
+
+Color32 ScreenUtilities::GetColorAt(const Float2& pos)
+{
+    // TODO: implement ScreenUtilities for macOS
+    return { 0, 0, 0, 255 };
+}
+
+void ScreenUtilities::PickColor()
+{
+    // This is what C# calls to start the color picking sequence
+    // This should stop mouse clicks from working for one click, and that click is on the selected color
+    // There is a class called NSColorSample that might implement that for you, but maybe not.
+}
+
+#endif

Source/Editor/Utilities/ScreenUtilities.h

@@ -0,0 +1,33 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Types/BaseTypes.h"
+#include "Engine/Core/Math/Color32.h"
+#include "Engine/Core/Math/Vector2.h"
+#include "Engine/Core/Delegate.h"
+
+/// <summary>
+/// Platform-dependent screen utilities.
+/// </summary>
+API_CLASS(Static) class FLAXENGINE_API ScreenUtilities
+{
+    DECLARE_SCRIPTING_TYPE_MINIMAL(ScreenUtilities);
+
+    /// <summary>
+    /// Gets the pixel color at the specified coordinates.
+    /// </summary>
+    /// <param name="pos">Screen-space coordinate to read.</param>
+    /// <returns>Pixel color at the specified coordinates.</returns>
+    API_FUNCTION() static Color32 GetColorAt(const Float2& pos);
+
+    /// <summary>
+    /// Starts async color picking. Color will be returned through PickColorDone event when the actions ends (user selected the final color with a mouse). When action is active, GetColorAt can be used to read the current value.
+    /// </summary>
+    API_FUNCTION() static void PickColor();
+
+    /// <summary>
+    /// Called when PickColor action is finished.
+    /// </summary>
+    API_EVENT() static Delegate<Color32> PickColorDone;
+};