aboutsummaryrefslogtreecommitdiff
path: root/graphics/cursorman.h
blob: 2f3891aee7c386ce9371b08d2c8372cfd9a33083 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 */

#ifndef GRAPHICS_CURSORMAN_H
#define GRAPHICS_CURSORMAN_H

#include "common/scummsys.h"
#include "common/stack.h"
#include "common/singleton.h"
#include "graphics/pixelformat.h"

namespace Graphics {

class CursorManager : public Common::Singleton<CursorManager> {
public:
	/** Query whether the mouse cursor is visible. */
	bool isVisible();

	/**
	 * Show or hide the mouse cursor.
	 *
	 * This function does not call OSystem::updateScreen, when visible is true.
	 * This fact might result in a non visible mouse cursor if the caller does
	 * not call OSystem::updateScreen itself after a showMouse(true) call.
	 *
	 * TODO: We might want to reconsider this behavior, it might be confusing
	 * for the user to call OSystem::updateScreen separately, on the other
	 * hand OSystem::updateScreen might as well display unwanted changes on
	 * the screen. Another alternative would be to let the backend worry
	 * about this on OSystem::showMouse call.
	 *
	 * @see OSystem::showMouse.
	 */
	bool showMouse(bool visible);

	/**
	 * Push a new cursor onto the stack, and set it in the backend. A local
	 * copy will be made of the cursor data, so the original buffer can be
	 * safely freed afterwards.
	 *
	 * @param buf		the new cursor data
	 * @param w			the width
	 * @param h			the height
	 * @param hotspotX	the hotspot X coordinate
	 * @param hotspotY	the hotspot Y coordinate
	 * @param keycolor	the color value for the transparent color. This may not exceed
	 *                  the maximum color value as defined by format.
	 * @param targetScale	the scale for which the cursor is designed
	 * @param format	a pointer to the pixel format which the cursor graphic uses,
	 *					CLUT8 will be used if this is NULL or not specified.
	 * @note It is ok for the buffer to be a NULL pointer. It is sometimes
	 *       useful to push a "dummy" cursor and modify it later. The
	 *       cursor will be added to the stack, but not to the backend.
	 */
	void pushCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, uint32 keycolor, int targetScale = 1, const Graphics::PixelFormat *format = NULL);

	/**
	 * Pop a cursor from the stack, and restore the previous one to the
	 * backend. If there is no previous cursor, the cursor is hidden.
	 */
	void popCursor();

	/**
	 * Replace the current cursor on the stack. If the stack is empty, the
	 * cursor is pushed instead. It's a slightly more optimized way of
	 * popping the old cursor before pushing the new one.
	 *
	 * @param buf		the new cursor data
	 * @param w		the width
	 * @param h		the height
	 * @param hotspotX	the hotspot X coordinate
	 * @param hotspotY	the hotspot Y coordinate
	 * @param keycolor	the color value for the transparent color. This may not exceed
	 *                  the maximum color value as defined by format.
	 * @param targetScale	the scale for which the cursor is designed
	 * @param format	a pointer to the pixel format which the cursor graphic uses,
	 *					CLUT8 will be used if this is NULL or not specified.
	 */
	void replaceCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, uint32 keycolor, int targetScale = 1, const Graphics::PixelFormat *format = NULL);

	/**
	 * Pop all of the cursors and cursor palettes from their respective stacks.
	 * The purpose is to ensure that all unecessary cursors are removed from the
	 * stack when returning to the launcher from an engine.
	 *
	 */
	void popAllCursors();

	/**
	 * Test whether cursor palettes are supported.
	 *
	 * This is just an convenience wrapper for checking for
	 * OSystem::kFeatureCursorHasPalette to be supported by OSystem.
	 *
	 * @see OSystem::kFeatureCursorHasPalette
	 * @see OSystem::hasFeature
	 */
	bool supportsCursorPalettes();

	/**
	 * Enable/Disable the current cursor palette.
	 *
	 * @param disable
	 */
	void disableCursorPalette(bool disable);

	/**
	 * Push a new cursor palette onto the stack, and set it in the backend.
	 * The palette entries from 'start' till (start+num-1) will be replaced
	 * so a full palette updated is accomplished via start=0, num=256.
	 *
	 * The palette data is specified in the same interleaved RGB format as
	 * used by all backends.
	 *
	 * @param colors	the new palette data, in interleaved RGB format
	 * @param start		the first palette entry to be updated
	 * @param num		the number of palette entries to be updated
	 *
	 * @note If num is zero, the cursor palette is disabled.
	 */
	void pushCursorPalette(const byte *colors, uint start, uint num);

	/**
	 * Pop a cursor palette from the stack, and restore the previous one to
	 * the backend. If there is no previous palette, the cursor palette is
	 * disabled instead.
	 */
	void popCursorPalette();

	/**
	 * Replace the current cursor palette on the stack. If the stack is
	 * empty, the palette is pushed instead. It's a slightly more optimized
	 * way of popping the old palette before pushing the new one.
	 *
	 * @param colors	the new palette data, in interleaved RGB format
	 * @param start		the first palette entry to be updated
	 * @param num		the number of palette entries to be updated
	 *
	 * @note If num is zero, the cursor palette is disabled.
	 */
	void replaceCursorPalette(const byte *colors, uint start, uint num);

private:
	friend class Common::Singleton<SingletonBaseType>;
	// Even though this is basically the default constructor we implement it
	// ourselves, so it is private and thus there is no way to create this class
	// except from the Singleton code.
	CursorManager() {}
	~CursorManager();

	struct Cursor {
		byte *_data;
		bool _visible;
		uint _width;
		uint _height;
		int _hotspotX;
		int _hotspotY;
		uint32 _keycolor;
		Graphics::PixelFormat _format;
		int _targetScale;

		uint _size;

		Cursor(const byte *data, uint w, uint h, int hotspotX, int hotspotY, uint32 keycolor, int targetScale = 1, const Graphics::PixelFormat *format = NULL);
		~Cursor();
	};

	struct Palette {
		byte *_data;
		uint _start;
		uint _num;
		uint _size;

		bool _disabled;

		Palette(const byte *colors, uint start, uint num);
		~Palette();
	};
	Common::Stack<Cursor *> _cursorStack;
	Common::Stack<Palette *> _cursorPaletteStack;
};

} // End of namespace Graphics

#define CursorMan	(::Graphics::CursorManager::instance())

#endif