Changeset 0e6e77f in mainline for uspace/lib/display/src/display.c

Timestamp:

2020-02-28T15:44:55Z (5 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

a8eed5f

Parents:

2a515dcd

git-author:

Jiri Svoboda <jiri@…> (2020-02-26 18:26:13)

git-committer:

Jiri Svoboda <jiri@…> (2020-02-28 15:44:55)

Message:

Window resize by client request

File:

• uspace/lib/display/src/display.c (modified) (2 diffs)

uspace/lib/display/src/display.c

@@ -38 +38 @@
 #include <mem.h>
 #include <stdlib.h>
+#include "../private/params.h"
 
 static errno_t display_callback_create(display_t *);
@@ -237 +238 @@
 
         *rgc = ipc_gc_get_ctx(gc);
+        return EOK;
+}
+
+/** Resize display window.
+ *
+ * It seems resizing windows should be easy with bounding rectangles.
+ * You have an old bounding rectangle and a new bounding rectangle (@a nrect).
+ * Change .p0 and top-left corner moves. Change .p1 and bottom-right corner
+ * moves. Piece of cake!
+ *
+ * There's always a catch, though. By series of resizes and moves .p0 could
+ * drift outside of the range of @c gfx_coord_t. Now what? @a offs to the
+ * rescue! @a offs moves the @em boundaries of the window with respect
+ * to the display, while keeping the @em contents of the window in the
+ * same place (with respect to the display). In other words, @a offs shifts
+ * the window's internal coordinate system.
+ *
+ * A few examples follow:
+ *
+ * Enlarge window by moving bottom-right corner 1 right, 1 down:
+ *
+ *   bound = (0, 0, 10, 10)
+ *   offs  = (0, 0)
+ *   nrect = (0, 0, 11, 11)
+ *
+ * Enlarge window by moving top-left corner, 1 up, 1 left, allowing the
+ * window-relative coordinate of the top-left corner to drift (undesirable)
+ *
+ *   bound = (0, 0, 10, 10)
+ *   offs  = (0, 0)
+ *   nrect = (-1, -1, 10, 10) <- this is the new bounding rectangle
+ *
+ * Enlarge window by moving top-left corner 1 up, 1 left, keeping top-left
+ * corner locked to (0,0) window-relative coordinates (desirable):
+ *
+ *   bound = (0, 0, 10, 10)
+ *   off   = (-1,-1)        <- top-left corner goes 1 up, 1 left
+ *   nrect = (0, 0, 11, 11) <- window still starts at 0,0 window-relative
+ *
+ * @param window Window
+ * @param nrect New bounding rectangle
+ * @param offs
+ * @return EOK on success or an error code. In both cases @a window must
+ *         not be accessed anymore
+ */
+errno_t display_window_resize(display_window_t *window, gfx_coord2_t *offs,
+    gfx_rect_t *nrect)
+{
+        async_exch_t *exch;
+        aid_t req;
+        ipc_call_t answer;
+        display_wnd_move_t wmove;
+        errno_t rc;
+
+        wmove.offs = *offs;
+        wmove.nrect = *nrect;
+
+        exch = async_exchange_begin(window->display->sess);
+        req = async_send_1(exch, DISPLAY_WINDOW_RESIZE, window->id, &answer);
+        rc = async_data_write_start(exch, &wmove, sizeof (display_wnd_move_t));
+        async_exchange_end(exch);
+        if (rc != EOK) {
+                async_forget(req);
+                return rc;
+        }
+
+        async_wait_for(req, &rc);
+        if (rc != EOK)
+                return rc;
+
         return EOK;
 }