1 files changed, 104 insertions, 0 deletions
diff --git a/xorg-server/test/misc.c b/xorg-server/test/misc.c
index 3d3b1a1e3..d98449ba0 100644
--- a/xorg-server/test/misc.c
+++ b/xorg-server/test/misc.c
@@ -27,6 +27,9 @@
 
 #include <stdint.h>
 #include "misc.h"
+#include "scrnintstr.h"
+
+ScreenInfo screenInfo;
 
 static void dix_version_compare(void)
 {
@@ -54,9 +57,110 @@ static void dix_version_compare(void)
     assert(rc < 0);
 }
 
+static void dix_update_desktop_dimensions(void)
+{
+    int i;
+    int x, y, w, h;
+    int w2, h2;
+    ScreenRec screens[MAXSCREENS];
+
+    for (i = 0; i < MAXSCREENS; i++)
+        screenInfo.screens[i] = &screens[i];
+
+    x = 0;
+    y = 0;
+    w = 10;
+    h = 5;
+    w2 = 35;
+    h2 = 25;
+
+#define assert_dimensions(_x, _y, _w, _h) \
+    update_desktop_dimensions();          \
+    printf("%d %d %d %d\n", screenInfo.x, screenInfo.y, screenInfo.width, screenInfo.height); \
+    assert(screenInfo.x == _x);           \
+    assert(screenInfo.y == _y);           \
+    assert(screenInfo.width == _w);       \
+    assert(screenInfo.height == _h);
+
+#define set_screen(idx, _x, _y, _w, _h)   \
+    screenInfo.screens[idx]->x = _x;      \
+    screenInfo.screens[idx]->y = _y;      \
+    screenInfo.screens[idx]->width = _w;  \
+    screenInfo.screens[idx]->height = _h; \
+
+    printf("Testing\n");
+
+    /* single screen */
+    screenInfo.numScreens = 1;
+    set_screen(0, x, y, w, h);
+    assert_dimensions(x, y, w, h);
+
+    /* dualhead rightof */
+    screenInfo.numScreens = 2;
+    set_screen(1, w, 0, w2, h2);
+    assert_dimensions(x, y, w + w2, h2);
+
+    /* dualhead belowof */
+    screenInfo.numScreens = 2;
+    set_screen(1, 0, h, w2, h2);
+    assert_dimensions(x, y, w2, h + h2);
+
+    /* triplehead L shape */
+    screenInfo.numScreens = 3;
+    set_screen(1, 0, h, w2, h2);
+    set_screen(2, w2, h2, w, h);
+    assert_dimensions(x, y, w + w2, h + h2);
+
+    /* quadhead 2x2 */
+    screenInfo.numScreens = 4;
+    set_screen(1, 0, h, w, h);
+    set_screen(2, w, h, w, h2);
+    set_screen(3, w, 0, w2, h);
+    assert_dimensions(x, y, w + w2, h + h2);
+
+    /* quadhead horiz line */
+    screenInfo.numScreens = 4;
+    set_screen(1, w, 0, w, h);
+    set_screen(2, 2 * w, 0, w, h);
+    set_screen(3, 3 * w, 0, w, h);
+    assert_dimensions(x, y, 4 * w, h);
+
+    /* quadhead vert line */
+    screenInfo.numScreens = 4;
+    set_screen(1, 0, h, w, h);
+    set_screen(2, 0, 2 * h, w, h);
+    set_screen(3, 0, 3 * h, w, h);
+    assert_dimensions(x, y, w, 4 * h);
+
+
+    /* x overlap */
+    screenInfo.numScreens = 2;
+    set_screen(0, 0, 0, w2, h2);
+    set_screen(1, w, 0, w2, h2);
+    assert_dimensions(x, y, w2 + w, h2);
+
+    /* y overlap */
+    screenInfo.numScreens = 2;
+    set_screen(0, 0, 0, w2, h2);
+    set_screen(1, 0, h, w2, h2);
+    assert_dimensions(x, y, w2, h2 + h);
+
+    /* negative origin */
+    screenInfo.numScreens = 1;
+    set_screen(0, -w2, -h2, w, h);
+    assert_dimensions(-w2, -h2, w, h);
+
+    /* dualhead negative origin, overlap */
+    screenInfo.numScreens = 2;
+    set_screen(0, -w2, -h2, w2, h2);
+    set_screen(1, -w, -h, w, h);
+    assert_dimensions(-w2, -h2, w2, h2);
+}
+
 int main(int argc, char** argv)
 {
     dix_version_compare();
+    dix_update_desktop_dimensions();
 
     return 0;
 }