1 /*****************************************************************************
2 * This file is part of gfxprim library. *
4 * Gfxprim is free software; you can redistribute it and/or *
5 * modify it under the terms of the GNU Lesser General Public *
6 * License as published by the Free Software Foundation; either *
7 * version 2.1 of the License, or (at your option) any later version. *
9 * Gfxprim is distributed in the hope that it will be useful, *
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
12 * Lesser General Public License for more details. *
14 * You should have received a copy of the GNU Lesser General Public *
15 * License along with gfxprim; if not, write to the Free Software *
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, *
17 * Boston, MA 02110-1301 USA *
19 * Copyright (C) 2009-2010 Jiri "BlueBear" Dluhos *
20 * <jiri.bluebear.dluhos@gmail.com> *
22 * Copyright (C) 2009-2010 Cyril Hrubis <metan@ucw.cz> *
24 *****************************************************************************/
26 #include "core/GP_Common.h"
27 #include "GP_TextMetric.h"
29 static unsigned int SpaceWidth(const GP_TextStyle
*style
)
31 //TODO: Does space change with pixel_yspace?
32 return style
->char_xspace
* style
->pixel_xmul
;
35 // FIXME: This is not quite right - due to offsets, characters
36 // can exceed their bounding box and then the reported width will be
37 // shorter than expected.
38 static unsigned int CharWidth(const GP_TextStyle
*style
, char ch
)
40 unsigned int pixel_multiplier
= style
->pixel_xmul
+ style
->pixel_xspace
;
41 const GP_CharData
*data
= GP_GetCharData(style
->font
, ch
);
44 data
= GP_GetCharData(style
->font
, ' ');
46 return data
->pre_offset
* pixel_multiplier
47 + data
->post_offset
* pixel_multiplier
;
50 static unsigned int MaxCharsWidth(const GP_TextStyle
*style
, const char *str
)
52 unsigned int max
= 0, i
;
54 for (i
= 0; str
[i
] != '\0'; i
++)
55 max
= GP_MAX(max
, CharWidth(style
, str
[i
]));
60 unsigned int GP_TextWidth(const GP_TextStyle
*style
, const char *str
)
62 GP_CHECK_TEXT_STYLE(style
);
63 GP_CHECK(str
, "NULL string specified");
65 unsigned int i
, len
= 0;
66 unsigned int space
= SpaceWidth(style
);
71 for (i
= 0; str
[i
] != '\0'; i
++)
72 len
+= CharWidth(style
, str
[i
]);
74 return len
+ (i
- 1) * space
;
77 unsigned int GP_TextMaxWidth(const GP_TextStyle
*style
, unsigned int len
)
79 GP_CHECK_TEXT_STYLE(style
);
81 unsigned int space_width
= SpaceWidth(style
);
82 unsigned int char_width
= style
->font
->max_bounding_width
83 * (style
->pixel_xmul
+ style
->pixel_xspace
);
88 return len
* char_width
+ (len
- 1) * space_width
;
91 unsigned int GP_TextMaxStrWidth(const GP_TextStyle
*style
, const char *str
,
94 GP_CHECK_TEXT_STYLE(style
);
95 GP_CHECK(str
, "NULL string specified");
97 unsigned int space_width
= SpaceWidth(style
);
98 unsigned int char_width
;
103 char_width
= MaxCharsWidth(style
, str
);
105 return len
* char_width
+ (len
- 1) * space_width
;
108 unsigned int GP_TextHeight(const GP_TextStyle
*style
)
110 GP_CHECK_TEXT_STYLE(style
);
112 return style
->font
->height
* style
->pixel_ymul
+
113 (style
->font
->height
- 1) * style
->pixel_yspace
;
116 unsigned int GP_TextAscent(const GP_TextStyle
*style
)
118 GP_CHECK_TEXT_STYLE(style
);
120 unsigned int h
= style
->font
->height
- style
->font
->baseline
;
121 return h
* style
->pixel_ymul
+ (h
- 1) * style
->pixel_yspace
;
124 unsigned int GP_TextDescent(const GP_TextStyle
*style
)
126 GP_CHECK_TEXT_STYLE(style
);
128 unsigned int h
= style
->font
->baseline
;
129 return h
* style
->pixel_ymul
+ (h
- 1) * style
->pixel_yspace
;