From 93b1553b4d65928e15c90d7c9a6277fb3c18d73e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miroslav=20=C5=A0ediv=C3=BD?= <sedivy.miro@gmail.com>
Date: Sat, 9 Jan 2021 22:58:18 +0100
Subject: [PATCH] xlib get cursor implementation.

---
 internal/desktop/xorg.go      |  4 ++++
 internal/desktop/xorg/xorg.c  |  5 +++++
 internal/desktop/xorg/xorg.go | 24 +++++++++++++++++++++++-
 internal/desktop/xorg/xorg.h  |  2 ++
 internal/types/desktop.go     | 10 ++++++++++
 5 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/internal/desktop/xorg.go b/internal/desktop/xorg.go
index 90faa4a2..370d02f4 100644
--- a/internal/desktop/xorg.go
+++ b/internal/desktop/xorg.go
@@ -60,3 +60,7 @@ func (manager *DesktopManagerCtx) SetKeyboardLayout(layout string) {
 func (manager *DesktopManagerCtx) SetKeyboardModifiers(NumLock int, CapsLock int, ScrollLock int) {
 	xorg.SetKeyboardModifiers(NumLock, CapsLock, ScrollLock)
 }
+
+func (manager *DesktopManagerCtx) GetCursorImage() *types.CursorImage {
+	return xorg.GetCursorImage()
+}
diff --git a/internal/desktop/xorg/xorg.c b/internal/desktop/xorg/xorg.c
index f631fc5e..85b0553a 100644
--- a/internal/desktop/xorg/xorg.c
+++ b/internal/desktop/xorg/xorg.c
@@ -146,3 +146,8 @@ void SetKeyboardModifiers(int num_lock, int caps_lock, int scroll_lock) {
 
   XFlush(display);
 }
+
+XFixesCursorImage *XGetCursorImage(void) {
+  Display *display = getXDisplay();
+  return XFixesGetCursorImage(display);
+}
diff --git a/internal/desktop/xorg/xorg.go b/internal/desktop/xorg/xorg.go
index 0b5ad44e..d05d3ee0 100644
--- a/internal/desktop/xorg/xorg.go
+++ b/internal/desktop/xorg/xorg.go
@@ -2,7 +2,7 @@ package xorg
 
 /*
 #cgo linux CFLAGS: -I/usr/src -I/usr/local/include/
-#cgo linux LDFLAGS: -L/usr/src -L/usr/local/lib -lX11 -lXtst -lXrandr -lxcb
+#cgo linux LDFLAGS: -L/usr/src -L/usr/local/lib -lX11 -lxcb -lXrandr -lXtst -lXfixes
 
 #include "xorg.h"
 */
@@ -219,6 +219,28 @@ func SetKeyboardModifiers(num_lock int, caps_lock int, scroll_lock int) {
 	C.SetKeyboardModifiers(C.int(num_lock), C.int(caps_lock), C.int(scroll_lock))
 }
 
+func GetCursorImage() *types.CursorImage {
+	mu.Lock()
+	defer mu.Unlock()
+
+	var cur *C.XFixesCursorImage
+	cur = C.XGetCursorImage()
+	defer C.XFree(unsafe.Pointer(cur))
+
+	width := uint16(cur.width)
+	height := uint16(cur.height)
+
+	return &types.CursorImage{
+		Width: width,
+		Height: height,
+		Xhot: uint16(cur.xhot),
+		Yhot: uint16(cur.yhot),
+		Serial: uint64(cur.cursor_serial),
+		// Xlib stores 32-bit data in longs, even if longs are 64-bits long.
+		Pixels: C.GoBytes(unsafe.Pointer(cur.pixels), C.int(width * height * 8)),
+	}
+}
+
 //export goCreateScreenSize
 func goCreateScreenSize(index C.int, width C.int, height C.int, mwidth C.int, mheight C.int) {
 	ScreenConfigurations[int(index)] = types.ScreenConfiguration{
diff --git a/internal/desktop/xorg/xorg.h b/internal/desktop/xorg/xorg.h
index 426769a0..4b228f9e 100644
--- a/internal/desktop/xorg/xorg.h
+++ b/internal/desktop/xorg/xorg.h
@@ -7,6 +7,7 @@
 #include <X11/XKBlib.h>
 #include <X11/extensions/Xrandr.h>
 #include <X11/extensions/XTest.h>
+#include <X11/extensions/Xfixes.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ -30,5 +31,6 @@ short XGetScreenRate();
 
 void SetKeyboardLayout(char *layout);
 void SetKeyboardModifiers(int num_lock, int caps_lock, int scroll_lock);
+XFixesCursorImage *XGetCursorImage(void);
 
 #endif
diff --git a/internal/types/desktop.go b/internal/types/desktop.go
index 1bded734..7acee29e 100644
--- a/internal/types/desktop.go
+++ b/internal/types/desktop.go
@@ -1,5 +1,14 @@
 package types
 
+type CursorImage struct {
+	Width  uint16
+	Height uint16
+	Xhot   uint16
+	Yhot   uint16
+	Serial uint64
+	Pixels []byte
+}
+
 type ScreenSize struct {
 	Width  int
 	Height int
@@ -31,6 +40,7 @@ type DesktopManager interface {
 	GetScreenSize() *ScreenSize
 	SetKeyboardLayout(layout string)
 	SetKeyboardModifiers(NumLock int, CapsLock int, ScrollLock int)
+	GetCursorImage() *CursorImage
 
 	// clipboard
 	ReadClipboard() string