104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
#if PLATFORM_LINUX
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#include "ScreenUtilities.h"
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#include "Engine/Core/Math/Color32.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/Platform/Linux/LinuxPlatform.h"
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#include "Engine/Platform/Linux/IncludeX11.h"
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Color32 ScreenUtilities::GetPixelAt(int32 x, int32 y)
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{
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X11::XColor color;
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Color32 outputColor;
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X11::Display* display = (X11::Display*) LinuxPlatform::GetXDisplay();
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int defaultScreen = X11::XDefaultScreen(display);
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X11::XImage* image;
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image = X11::XGetImage(display, X11::XRootWindow(display, defaultScreen), x, y, 1, 1, AllPlanes, XYPixmap);
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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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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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return outputColor;
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}
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Int2 ScreenUtilities::GetScreenCursorPosition()
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{
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Int2 cursorPosition = { 0, 0 };
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X11::Display* display = (X11::Display*) LinuxPlatform::GetXDisplay();
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X11::Window rootWindow = X11::XRootWindow(display, X11::XDefaultScreen(display));
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// Buffers (Some useful, some not.)
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X11::Window rootWindowBuffer;
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int rootX, rootY;
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int winXBuffer, winYBuffer;
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unsigned int maskBuffer;
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int gotPointer = X11::XQueryPointer(display, rootWindow, &rootWindowBuffer, &rootWindowBuffer, &rootX, &rootY, &winXBuffer, &winYBuffer, &maskBuffer);
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if (!gotPointer) {
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LOG(Error, "Failed to find the mouse pointer (Are you using multiple displays?)");
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return cursorPosition;
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}
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cursorPosition.X = rootX;
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cursorPosition.Y = rootY;
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return cursorPosition;
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}
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class ScreenUtilitiesLinux
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{
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public:
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static void BlockAndReadMouse();
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static void xEventHandler(void* event);
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};
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void ScreenUtilitiesLinux::xEventHandler(void* eventPtr) {
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X11::XEvent* event = (X11::XEvent*) eventPtr;
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X11::Display* display = (X11::Display*) LinuxPlatform::GetXDisplay();
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if (event->type == ButtonPress) {
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Int2 cursorPosition = ScreenUtilities::GetScreenCursorPosition();
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Color32 colorPicked = ScreenUtilities::GetPixelAt(cursorPosition.X, cursorPosition.Y);
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ScreenUtilities::PickColorDone(colorPicked); // Run the callback for picking colors being complete.
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LinuxPlatform::xEventRecieved.Unbind(xEventHandler); // Unbind the event, we only want to handle one click event
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X11::XUngrabPointer(display, CurrentTime);
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}
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}
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void ScreenUtilitiesLinux::BlockAndReadMouse()
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{
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X11::Display* display = (X11::Display*) LinuxPlatform::GetXDisplay();
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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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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::xEventRecieved.Bind(xEventHandler);
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}
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Delegate<Color32> ScreenUtilities::PickColorDone;
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void ScreenUtilities::PickColor()
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{
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ScreenUtilitiesLinux::BlockAndReadMouse();
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}
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#endif |