Add panning test for primary plane.

index fffad9f..5cdc48b 100644
@@ -532,6 +532,13 @@ void igt_display_init(igt_display_t *display, int drm_fd)
 	display->outputs = calloc(display->n_outputs, sizeof(igt_output_t));
 	igt_assert(display->outputs);
 
+	/*
+	 * Be default display can scan out from the original position of the frame buffer.
+	 * But we can change this position making display scan out with a offset.
+	 */
+	display->buffer_x = 0;
+	display->buffer_y = 0;
+
 	for (i = 0; i < display->n_outputs; i++) {
 		igt_output_t *output = &display->outputs[i];
 

@@ -830,13 +837,13 @@ static int igt_output_commit(igt_output_t *output)
 			    igt_output_name(output),
 			    pipe_name(output->config.pipe),
 			    fb_id,
-			    0, 0,
+			    display->buffer_x, display->buffer_y,
 			    mode->hdisplay, mode->vdisplay);
 
 			ret = drmModeSetCrtc(display->drm_fd,
 					     crtc_id,
 					     fb_id,
-					     0, 0, /* x, y */
+					     display->buffer_x, display->buffer_y, /* x, y */
 					     &output->id,
 					     1,
 					     mode);

@@ -849,7 +856,7 @@ static int igt_output_commit(igt_output_t *output)
 			ret = drmModeSetCrtc(display->drm_fd,
 					     crtc_id,
 					     fb_id,
-					     0, 0, /* x, y */
+					     display->buffer_x, display->buffer_y, /* x, y */
 					     NULL, /* connectors */
 					     0,    /* n_connectors */
 					     NULL  /* mode */);

@@ -987,6 +994,26 @@ void igt_plane_set_fb(igt_plane_t *plane, struct igt_fb *fb)
 	plane->fb_changed = true;
 }
 
+void igt_plane_set_fb_offset(igt_plane_t *plane, struct igt_fb *fb, int x, int y)
+{
+	igt_pipe_t *pipe = plane->pipe;
+	igt_display_t *display = pipe->display;
+
+	(*display).buffer_x = x;
+	(*display).buffer_y = y;
+
+	LOG(display, "%c.%d: plane_set_fb(%d)\n", pipe_name(pipe->pipe),
+	    plane->index, fb ? fb->fb_id : 0);
+
+	plane->fb = fb;
+
+	if (plane->is_primary)
+		pipe->need_set_crtc = true;
+	else if (plane->is_cursor)
+		pipe->need_set_cursor = true;
+
+	plane->fb_changed = true;
+}
 void igt_plane_set_position(igt_plane_t *plane, int x, int y)
 {
 	igt_pipe_t *pipe = plane->pipe;

index 439a634..cb9370e 100644
@@ -139,6 +139,8 @@ struct igt_display {
 	int log_shift;
 	int n_pipes;
 	int n_outputs;
+	int buffer_x;
+	int buffer_y;
 	unsigned long pipes_in_use;
 	igt_output_t *outputs;
 	igt_pipe_t pipes[I915_MAX_PIPES];

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