Atlas - SDL_qnxmouse.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 2026 BlackBerry Limited
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21
22#include "SDL_internal.h"
23#include "../SDL_sysvideo.h"
24#include "SDL_qnx.h"
25#include "../../events/SDL_mouse_c.h"
26
27#include <errno.h>
28
29
30static int SDLToScreenCursorShape(SDL_SystemCursor id)
31{
32    // This is reserved by screen, but still not used for anything.
33    int shape = -1;
34
35    switch(id)
36    {
37    case SDL_SYSTEM_CURSOR_DEFAULT:
38    case SDL_SYSTEM_CURSOR_NOT_ALLOWED:
39        shape = SCREEN_CURSOR_SHAPE_ARROW;
40        break;
41    case SDL_SYSTEM_CURSOR_TEXT:
42        shape = SCREEN_CURSOR_SHAPE_IBEAM;
43        break;
44    case SDL_SYSTEM_CURSOR_WAIT:
45        shape = SCREEN_CURSOR_SHAPE_WAIT;
46        break;
47    case SDL_SYSTEM_CURSOR_CROSSHAIR:
48        shape = SCREEN_CURSOR_SHAPE_CROSS;
49        break;
50    case SDL_SYSTEM_CURSOR_NWSE_RESIZE:
51    case SDL_SYSTEM_CURSOR_NESW_RESIZE:
52    case SDL_SYSTEM_CURSOR_EW_RESIZE:
53    case SDL_SYSTEM_CURSOR_NS_RESIZE:
54    case SDL_SYSTEM_CURSOR_MOVE:
55        shape = SCREEN_CURSOR_SHAPE_MOVE;
56        break;
57    case SDL_SYSTEM_CURSOR_POINTER:
58        shape = SCREEN_CURSOR_SHAPE_HAND;
59        break;
60    default:
61        break;
62    }
63    return shape;
64}
65
66static SDL_Cursor *genericCreateCursor(int shape)
67{
68    SDL_Cursor          *cursor;
69    SDL_CursorData      *impl;
70    screen_session_t    session;
71    screen_context_t    *context = getContext();
72
73    cursor = SDL_calloc(1, sizeof(SDL_Cursor));
74    if (cursor) {
75        impl = SDL_calloc(1, sizeof(SDL_CursorData));;
76        if (impl == NULL) {
77            SDL_free(cursor);
78            SDL_OutOfMemory();
79        }
80        impl->realized_shape = shape;
81
82        screen_create_session_type(&session, *context, SCREEN_EVENT_POINTER);
83        screen_set_session_property_iv(session, SCREEN_PROPERTY_CURSOR, &shape);
84
85        impl->session = session;
86        impl->is_visible = true;
87        cursor->internal = (void*)impl;
88    } else {
89        SDL_OutOfMemory();
90    }
91
92    return cursor;
93}
94
95static SDL_Cursor *createCursor(SDL_Surface * surface, int hot_x, int hot_y)
96{
97    return genericCreateCursor(SCREEN_CURSOR_SHAPE_ARROW);
98}
99
100static SDL_Cursor *createSystemCursor(SDL_SystemCursor id)
101{
102    int shape = SDLToScreenCursorShape(id);
103    if (shape < 0) {
104        SDL_assert(0);
105        return NULL;
106    }
107
108    return genericCreateCursor(shape);
109}
110
111static bool showCursor(SDL_Cursor * cursor)
112{
113    SDL_CursorData      *impl;
114    screen_session_t    session;
115    int shape;
116
117    // SDL does not provide information about previous visibility to its
118    // drivers. We need to track that ourselves.
119    if (cursor) {
120        impl = (SDL_CursorData*)cursor->internal;
121        SDL_assert(impl != NULL);
122        if (impl->is_visible) {
123            return true;
124        }
125        session = impl->session;
126        shape = impl->realized_shape;
127        impl->is_visible = true;
128    } else {
129        cursor = SDL_GetCursor();
130        if (cursor == NULL) {
131            return false;
132        }
133        impl = (SDL_CursorData*)cursor->internal;
134        SDL_assert(impl != NULL);
135        if (!impl->is_visible) {
136            return 0;
137        }
138        session = impl->session;
139        shape = SCREEN_CURSOR_SHAPE_NONE;
140        impl->is_visible = false;
141    }
142
143    if (screen_set_session_property_iv(session, SCREEN_PROPERTY_CURSOR, &shape) < 0) {
144        return false;
145    }
146
147    return true;
148}
149
150static void freeCursor(SDL_Cursor * cursor)
151{
152    SDL_CursorData *impl = (SDL_CursorData*)cursor->internal;
153    if (impl != NULL) {
154        screen_destroy_session(impl->session);
155        SDL_free(impl);
156    }
157    SDL_free(cursor);
158}
159
160static bool setRelativeMouseMode(bool enabled)
161{
162    // We're tracking rel-position explicitly, but this is still needed so
163    // SDL_SetRelativeMouseMode() & friends aren't a no-op.
164    //
165    // TODO: It may be possible to achieve this using SCREEN_PROPERTY_DISPLACEMENT instead.
166    return true;
167}
168
169void initMouse(SDL_VideoDevice *_this)
170{
171    SDL_Mouse       *mouse = SDL_GetMouse();
172    SDL_MouseData   *mouse_data;
173
174    mouse_data = (SDL_MouseData *)SDL_calloc(1, sizeof(SDL_MouseData));
175    if (mouse_data == NULL) {
176        return;
177    }
178    SDL_zerop(mouse_data);
179    mouse->internal = mouse_data;
180
181    mouse->CreateCursor = createCursor;
182    mouse->CreateSystemCursor = createSystemCursor;
183    mouse->ShowCursor = showCursor;
184    mouse->FreeCursor = freeCursor;
185
186    mouse->SetRelativeMouseMode = setRelativeMouseMode;
187
188    SDL_SetDefaultCursor(createCursor(NULL, 0, 0));
189}
190
[FILE END]
(C) 2025 0x4248
(C) 2025 4248 Media and 4248 Systems, All part of 0x4248
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