Implemented MiniFB for X11

src/x11/X11MiniFB.c

@@ -0,0 +1,148 @@
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <MiniFB.h>
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#define KEY_FUNCTION 0xFF
+#define KEY_ESC 0x1B
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+static Display* s_display;
+static int s_screen;
+static int s_width;
+static int s_height;
+static Window s_window;
+static GC s_gc;
+static XImage *s_ximage;
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+int mfb_open(const char* title, int width, int height)
+{
+	int depth, i, formatCount, convDepth = -1;
+	XPixmapFormatValues* formats;
+	XSetWindowAttributes windowAttributes;
+	XSizeHints sizeHints;
+	Visual* visual;
+
+	s_display = XOpenDisplay(0);
+
+	if (!s_display)
+		return -1;
+	
+	s_screen = DefaultScreen(s_display);
+	visual = DefaultVisual(s_display, s_screen);
+	formats = XListPixmapFormats(s_display, &formatCount);
+	depth = DefaultDepth(s_display, s_screen);
+	Window defaultRootWindow = DefaultRootWindow(s_display);
+
+	for (i = 0; i < formatCount; ++i)
+	{
+		if (depth == formats[i].depth)
+		{
+			convDepth = formats[i].bits_per_pixel;
+			break;
+		}
+	}
+  
+	XFree(formats);
+
+	// We only support 32-bit right now
+	if (convDepth != 32)
+	{
+		XCloseDisplay(s_display);
+		return -1;
+	}
+
+	int screenWidth = DisplayWidth(s_display, s_screen);
+	int screenHeight = DisplayHeight(s_display, s_screen);
+
+	windowAttributes.border_pixel = BlackPixel(s_display, s_screen);
+	windowAttributes.background_pixel = BlackPixel(s_display, s_screen);
+	windowAttributes.backing_store = NotUseful;
+
+	s_window = XCreateWindow(s_display, defaultRootWindow, (screenWidth - width) / 2,
+					(screenHeight - height) / 2, width, height, 0, depth, InputOutput,
+					visual, CWBackPixel | CWBorderPixel | CWBackingStore,
+					&windowAttributes);
+	if (!s_window)
+		return 0;
+
+	XSelectInput(s_display, s_window, KeyPressMask | KeyReleaseMask);
+	XStoreName(s_display, s_window, title);
+
+	sizeHints.flags = PPosition | PMinSize | PMaxSize;
+	sizeHints.x = 0;
+	sizeHints.y = 0;
+	sizeHints.min_width = width;
+	sizeHints.max_width = width;
+	sizeHints.min_height = height;
+	sizeHints.max_height = height;
+
+  	XSetWMNormalHints(s_display, s_window, &sizeHints);
+  	XClearWindow(s_display, s_window);
+  	XMapRaised(s_display, s_window);
+	XFlush(s_display);
+
+	s_gc = DefaultGC(s_display, s_screen);
+
+	s_ximage = XCreateImage(s_display, CopyFromParent, depth, ZPixmap, 0, NULL, width, height, 32, width * 4);
+
+	s_width = width;
+	s_height = height;
+
+	return 1;
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+static int processEvents()
+{
+	XEvent event;
+	KeySym sym;
+
+	if (!XPending(s_display))
+		return;
+
+	XNextEvent(s_display, &event);
+
+	if (event.type != KeyPress)
+		return 0;
+
+	sym = XLookupKeysym(&event.xkey, 0);
+
+	if ((sym >> 8) != KEY_FUNCTION)
+		return 0;
+
+	if ((sym & 0xFF) == KEY_ESC)
+		return -1;
+
+	return 0;
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+int mfb_update(void* buffer)
+{
+	s_ximage->data = (char*)buffer;
+
+	XPutImage(s_display, s_window, s_gc, s_ximage, 0, 0, 0, 0, s_width, s_height);
+	XFlush(s_display);
+
+	if (processEvents() < 0)
+		return -1;
+
+	return 0;
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void mfb_close (void)
+{
+	s_ximage->data = NULL;
+	XDestroyImage(s_ximage);
+	XDestroyWindow(s_display, s_window);
+	XCloseDisplay(s_display);
+}