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src/window.c

@@ -0,0 +1,142 @@
+#include <stdlib.h>
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xdbe.h>
+
+#include <hexagram/window.h>
+
+struct _hexagram_window {
+    Display *display;
+
+    int screen;
+
+    unsigned int width,
+                 height;
+
+    Window root,
+           win;
+
+    Pixmap shape,
+           bg;
+
+    GC gc;
+
+    XGCValues gc_values;
+
+    XdbeBackBuffer buf;
+    XdbeSwapInfo   swapinfo;
+};
+
+hexagram_window *hexagram_window_new_x11(const char *display,
+                                         unsigned int width,
+                                         unsigned int height) {
+    hexagram_window *window;
+    int major, minor;
+
+    if ((window = malloc(sizeof(*window))) == NULL) {
+        goto error_malloc_window;
+    }
+
+    /*
+     * Connect to the X display
+     */
+    if ((window->display = XOpenDisplay(display)) == NULL) {
+        goto error_x_open_display;
+    }
+
+    window->screen = DefaultScreen(window->display);
+    window->root   = DefaultRootWindow(window->display);
+
+    /*
+     * Create the X window
+     */
+    if ((window->win = XCreateSimpleWindow(window->display,
+                                           window->root,
+                                           0, 0,
+                                           width, height, 0, 0, 0)) == 0) {
+        goto error_x_create_simple_window;
+    }
+
+    /*
+     * Create a back buffer, if the Xdbe extension is available.  If not, render
+     * directly to the window, at the cost of flickering.
+     */
+    if (XdbeQueryExtension(window->display, &major, &minor)) {
+        if ((window->buf = XdbeAllocateBackBufferName(window->display,
+                                                      window->win,
+                                                      XdbeBackground)) == 0) {
+            goto error_x_dbe_allocate_back_buffer_name;
+        }
+
+        window->swapinfo.swap_window = window->win;
+        window->swapinfo.swap_action = XdbeBackground;
+    } else {
+        window->buf = window->win;
+    }
+
+    if ((window->bg = XCreatePixmap(window->display,
+                                    window->win, width, height, 24)) == 0) {
+        goto error_x_create_pixmap_bg;
+    }
+
+    window->gc_values.foreground         = 0x000000;
+    window->gc_values.background         = 0xffffff;
+    window->gc_values.graphics_exposures = 0;
+
+    if ((window->gc = XCreateGC(window->display,
+                                window->win,
+                                HEXAGRAM_WINDOW_GC_FLAGS,
+                                &window->gc_values)) == 0) {
+        goto error_x_create_gc;
+    }
+
+    return window;
+
+error_x_create_gc:
+    (void)XFreePixmap(window->display, window->bg);
+        
+error_x_create_pixmap_bg:
+    if (window->buf != window->win) {
+        (void)XdbeDeallocateBackBufferName(window->display, window->buf);
+    }
+
+error_x_dbe_allocate_back_buffer_name:
+    (void)XDestroyWindow(window->display, window->win);
+
+error_x_create_simple_window:
+    (void)XCloseDisplay(window->display);
+
+error_x_open_display:
+    free(window);
+
+error_malloc_window:
+    return NULL;
+}
+
+int hexagram_window_show(hexagram_window *window) {
+    if (XSelectInput(window->display, window->win,
+            ExposureMask | ButtonPressMask | KeyPressMask) == 0) {
+        goto error_x;
+    }
+
+    if (XMapWindow(window->display, window->win) == 0) {
+        goto error_x;
+    }
+
+    return 0;
+
+error_x:
+    return -1;
+}
+
+void hexagram_window_destroy(hexagram_window *window) {
+    (void)XFreeGC(window->display, window->gc);
+
+    (void)XFreePixmap(window->display, window->bg);
+
+    if (window->buf != window->win) {
+        (void)XdbeDeallocateBackBufferName(window->display, window->buf);
+    }
+
+    XUnmapWindow(window->display, window->win);
+}