From d9ceeb2044f3f2dfa96f1a2989d629d4b965f512 Mon Sep 17 00:00:00 2001
From: Taekyun Kim <tkq.kim@samsung.com>
Date: Thu, 1 Oct 2015 16:45:36 +0900
Subject: [PATCH] pepper: API for setting pointer clamp area

Pointer can never go outside the clamp area. Initial value is infinite area.

Change-Id: I832c55791cb499e17c01512fd9052cbd30946dec
---
 src/lib/pepper/pepper-internal.h |  6 +++
 src/lib/pepper/pepper.h          |  6 +++
 src/lib/pepper/pointer.c         | 87 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 99 insertions(+)

diff --git a/src/lib/pepper/pepper-internal.h b/src/lib/pepper/pepper-internal.h
index ec0f4f6..e86e80e 100644
--- a/src/lib/pepper/pepper-internal.h
+++ b/src/lib/pepper/pepper-internal.h
@@ -247,8 +247,14 @@ struct pepper_pointer
     const pepper_pointer_grab_t    *grab;
     void                           *data;
 
+    uint32_t                        time;
     double                          x, y;
     double                          vx, vy;
+
+    struct {
+        double                      x0, y0;
+        double                      x1, y1;
+    } clamp;
 };
 
 pepper_pointer_t *
diff --git a/src/lib/pepper/pepper.h b/src/lib/pepper/pepper.h
index 36fc400..b355198 100644
--- a/src/lib/pepper/pepper.h
+++ b/src/lib/pepper/pepper.h
@@ -300,6 +300,12 @@ struct pepper_pointer_grab
     void (*cancel)(pepper_pointer_t *pointer, void *data);
 };
 
+PEPPER_API pepper_bool_t
+pepper_pointer_set_clamp(pepper_pointer_t *pointer, double x0, double y0, double x1, double y1);
+
+PEPPER_API void
+pepper_pointer_get_clamp(pepper_pointer_t *pointer, double *x0, double *y0, double *x1, double *y1);
+
 PEPPER_API void
 pepper_pointer_get_position(pepper_pointer_t *pointer, double *x, double *y);
 
diff --git a/src/lib/pepper/pointer.c b/src/lib/pepper/pointer.c
index c761623..4bc0a9d 100644
--- a/src/lib/pepper/pointer.c
+++ b/src/lib/pepper/pointer.c
@@ -1,4 +1,5 @@
 #include "pepper-internal.h"
+#include <float.h>
 
 static void
 pointer_set_cursor(struct wl_client *client, struct wl_resource *resource, uint32_t serial,
@@ -68,14 +69,51 @@ static const pepper_pointer_grab_t default_pointer_grab =
     default_pointer_grab_cancel,
 };
 
+static pepper_bool_t
+pointer_clamp(pepper_pointer_t *pointer)
+{
+    pepper_bool_t clamped = PEPPER_FALSE;
+
+    if (pointer->x < pointer->clamp.x0)
+    {
+        pointer->x = pointer->clamp.x0;
+        clamped = PEPPER_TRUE;
+    }
+
+    if (pointer->x > pointer->clamp.x1)
+    {
+        pointer->x = pointer->clamp.x1;
+        clamped = PEPPER_TRUE;
+    }
+
+    if (pointer->y < pointer->clamp.y0)
+    {
+        pointer->y = pointer->clamp.y0;
+        clamped = PEPPER_TRUE;
+    }
+
+    if (pointer->y > pointer->clamp.y1)
+    {
+        pointer->y = pointer->clamp.y1;
+        clamped = PEPPER_TRUE;
+    }
+
+    return clamped;
+}
+
 static void
 pointer_set_position(pepper_pointer_t *pointer, uint32_t time, double x, double y)
 {
     pepper_input_event_t event;
 
+    if (x == pointer->x && y == pointer->y)
+        return;
+
     pointer->x = x;
     pointer->y = y;
 
+    pointer_clamp(pointer);
+
     pointer->grab->motion(pointer, pointer->data, time, x, y);
 
     /* Emit motion event. */
@@ -127,6 +165,11 @@ pepper_pointer_create(pepper_seat_t *seat)
     pepper_input_init(&pointer->input, seat, &pointer->base, pointer_handle_focus_destroy);
     pointer->grab = &default_pointer_grab;
 
+    pointer->clamp.x0 = DBL_MIN;
+    pointer->clamp.y0 = DBL_MIN;
+    pointer->clamp.x1 = DBL_MAX;
+    pointer->clamp.y1 = DBL_MAX;
+
     return pointer;
 }
 
@@ -163,6 +206,50 @@ pepper_pointer_bind_resource(struct wl_client *client, struct wl_resource *resou
     }
 }
 
+PEPPER_API pepper_bool_t
+pepper_pointer_set_clamp(pepper_pointer_t *pointer, double x0, double y0, double x1, double y1)
+{
+    if (x1 < x0 || y1 < y0)
+        return PEPPER_FALSE;
+
+    pointer->clamp.x0 = x0;
+    pointer->clamp.y0 = y0;
+    pointer->clamp.x1 = x1;
+    pointer->clamp.y1 = y1;
+
+    if (pointer_clamp(pointer))
+    {
+        pepper_input_event_t event;
+
+        pointer->grab->motion(pointer, pointer->data, pointer->time, pointer->x, pointer->y);
+
+        memset(&event, 0x00, sizeof(pepper_input_event_t));
+        event.id = PEPPER_EVENT_POINTER_MOTION;
+        event.time = pointer->time;
+        event.x = pointer->x;
+        event.y = pointer->y;
+        pepper_object_emit_event(&pointer->base, PEPPER_EVENT_POINTER_MOTION, &event);
+    }
+
+    return PEPPER_TRUE;
+}
+
+PEPPER_API void
+pepper_pointer_get_clamp(pepper_pointer_t *pointer, double *x0, double *y0, double *x1, double *y1)
+{
+    if (x0)
+        *x0 = pointer->clamp.x0;
+
+    if (y0)
+        *y0 = pointer->clamp.y0;
+
+    if (x1)
+        *x1 = pointer->clamp.x1;
+
+    if (y1)
+        *y1 = pointer->clamp.y1;
+}
+
 PEPPER_API void
 pepper_pointer_get_position(pepper_pointer_t *pointer, double *x, double *y)
 {
-- 
2.7.4