Ari Vuollet
f4fcc07288
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95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
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#if PLATFORM_LINUX
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#include "Engine/Platform/Types.h"
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#include "Engine/Platform/ScreenUtilities.h"
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#include "Engine/Core/Math/Vector2.h"
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#include "Engine/Core/Delegate.h"
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#include "Engine/Core/Log.h"
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#include "Engine/Profiler/ProfilerCPU.h"
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#include "Engine/Platform/Linux/LinuxPlatform.h"
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#include "Engine/Platform/Linux/IncludeX11.h"
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Delegate<Color32> ScreenUtilitiesBase::PickColorDone;
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Color32 LinuxScreenUtilities::GetColorAt(const Float2& pos)
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{
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X11::Display* display = (X11::Display*)Platform::GetXDisplay();
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if (display)
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{
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int defaultScreen = X11::XDefaultScreen(display);
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X11::Window rootWindow = X11::XRootWindow(display, defaultScreen);
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X11::XImage* image = X11::XGetImage(display, rootWindow, (int)pos.X, (int)pos.Y, 1, 1, AllPlanes, XYPixmap);
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if (image)
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{
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X11::XColor color;
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color.pixel = XGetPixel(image, 0, 0);
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X11::XFree(image);
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X11::XQueryColor(display, X11::XDefaultColormap(display, defaultScreen), &color);
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Color32 outputColor;
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outputColor.R = color.red / 256;
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outputColor.G = color.green / 256;
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outputColor.B = color.blue / 256;
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outputColor.A = 255;
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return outputColor;
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}
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else
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{
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// XWayland doesn't support XGetImage...
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// TODO: Fallback to Wayland implementation here?
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return Color32::Black;
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}
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}
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else
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{
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// TODO: Wayland
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ASSERT(false);
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}
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}
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void OnScreenUtilsXEventCallback(void* eventPtr)
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{
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X11::XEvent* event = (X11::XEvent*) eventPtr;
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X11::Display* display = (X11::Display*)Platform::GetXDisplay();
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if (event->type == ButtonPress)
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{
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const Float2 cursorPos = Platform::GetMousePosition();
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const Color32 colorPicked = ScreenUtilities::GetColorAt(cursorPos);
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X11::XUngrabPointer(display, CurrentTime);
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ScreenUtilities::PickColorDone(colorPicked);
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LinuxPlatform::xEventReceived.Unbind(OnScreenUtilsXEventCallback);
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}
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}
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void LinuxScreenUtilities::PickColor()
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{
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PROFILE_CPU();
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X11::Display* display = (X11::Display*)Platform::GetXDisplay();
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if (display)
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{
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X11::Window rootWindow = X11::XRootWindow(display, X11::XDefaultScreen(display));
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X11::Cursor cursor = XCreateFontCursor(display, 130);
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int grabbedPointer = X11::XGrabPointer(display, rootWindow, 0, ButtonPressMask, GrabModeAsync, GrabModeAsync, rootWindow, cursor, CurrentTime);
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if (grabbedPointer != GrabSuccess)
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{
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LOG(Error, "Failed to grab cursor for events.");
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X11::XFreeCursor(display, cursor);
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return;
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}
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X11::XFreeCursor(display, cursor);
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LinuxPlatform::xEventReceived.Bind(OnScreenUtilsXEventCallback);
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}
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else
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{
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// TODO: Wayland
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ASSERT(false);
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}
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}
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#endif
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