aboutsummaryrefslogtreecommitdiff
path: root/graphics/font.h
blob: 77b7623a855271f3ef2d26f8ae970c46c8ad22c4 (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
/* 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.
 */

#ifndef GRAPHICS_FONT_H
#define GRAPHICS_FONT_H

#include "common/str.h"
#include "common/ustr.h"

namespace Common {
template<class T> class Array;
}

namespace Graphics {

struct Surface;

/** Text alignment modes */
enum TextAlign {
	kTextAlignInvalid,
	kTextAlignLeft,     ///< Text should be aligned to the left
	kTextAlignCenter,   ///< Text should be centered
	kTextAlignRight     ///< Text should be aligned to the right
};

/**
 * Instances of this class represent a distinct font, with a built-in renderer.
 * @todo Maybe move the high-level methods (drawString etc.) to a separate
 *       FontRenderer class? That way, we could have different variants... ?
 */
class Font {
public:
	Font() {}
	virtual ~Font() {}

	/**
	 * Query the height of the font.
	 *
	 * @return font height.
	 */
	virtual int getFontHeight() const = 0;

	/**
	 * Query the maximum width of the font.
	 *
	 * @return maximum font width.
	 */
	virtual int getMaxCharWidth() const = 0;

	/**
	 * Query the width of a specific character.
	 *
	 * @param chr The character to query the width of.
	 * @return The character's width.
	 */
	virtual int getCharWidth(uint32 chr) const = 0;

	/**
	 * Query the kerning offset between two characters.
	 *
	 * @param left  The left character. May be 0.
	 * @param right The right character. May be 0.
	 * @return The horizontal displacement.
	 */
	virtual int getKerningOffset(uint32 left, uint32 right) const;

	/**
	 * Draw a character at a specific point on a surface.
	 *
	 * Note that the point describes the top left edge point of the
	 * character's bounding box.
	 *
	 * The Font implemenation should take care of not drawing outside of the
	 * specified surface.
	 *
	 * @param dst The surface to drawn on.
	 * @param chr The character to draw.
	 * @param x   The x coordinate where to draw the character.
	 * @param y   The y coordinate where to draw the character.
	 * @param color The color of the character.
	 */
	virtual void drawChar(Surface *dst, uint32 chr, int x, int y, uint32 color) const = 0;

	// TODO: Add doxygen comments to this
	void drawString(Surface *dst, const Common::String &str, int x, int y, int w, uint32 color, TextAlign align = kTextAlignLeft, int deltax = 0, bool useEllipsis = true) const;
	void drawString(Surface *dst, const Common::U32String &str, int x, int y, int w, uint32 color, TextAlign align = kTextAlignLeft) const;

	/**
	 * Compute and return the width the string str has when rendered using this font.
	 */
	int getStringWidth(const Common::String &str) const;
	int getStringWidth(const Common::U32String &str) const;

	/**
	 * Take a text (which may contain newline characters) and word wrap it so that
	 * no text line is wider than maxWidth pixels. If necessary, additional line breaks
	 * are generated, preferably between words (i.e. where whitespaces are).
	 * The resulting lines are appended to the lines string list.
	 * It returns the maximal width of any of the new lines (i.e. a value which is less
	 * or equal to maxWidth).
	 *
	 * @param str      the string to word wrap
	 * @param maxWidth the maximum width a line may have
	 * @param lines    the string list to which the text lines from str are appended
	 * @return the maximal width of any of the lines added to lines
	 */
	int wordWrapText(const Common::String &str, int maxWidth, Common::Array<Common::String> &lines) const;
	int wordWrapText(const Common::U32String &str, int maxWidth, Common::Array<Common::U32String> &lines) const;
};

} // End of namespace Graphics

#endif