libs/text/GP_Text.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   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.        *
   8  *                                                                           *
   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.                           *
  13  *                                                                           *
  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                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2011 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2014 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include "gfx/GP_Gfx.h"
  27 #include "core/GP_FnPerBpp.h"
  28 #include "core/GP_Debug.h"
  29 #include "GP_TextMetric.h"
  30 #include "GP_Text.h"
  31
  32 GP_TextStyle GP_DefaultStyle = GP_DEFAULT_TEXT_STYLE;
  33
  34 static int do_align(GP_Coord *topleft_x, GP_Coord *topleft_y, int align,
  35                     GP_Coord x, GP_Coord y, const GP_TextStyle *style,
  36                     GP_Size width)
  37 {
  38         GP_Size height = GP_TextHeight(style);
  39
  40         switch (align & 0x0f) {
  41         case GP_ALIGN_LEFT:
  42                 *topleft_x = x - width + 1;
  43                 break;
  44         case GP_ALIGN_RIGHT:
  45                 *topleft_x = x;
  46                 break;
  47         case GP_ALIGN_CENTER:
  48                 *topleft_x = x - width/2;
  49                 break;
  50         default:
  51                 GP_DEBUG(1, "ALIGN 0x%0x\n", align);
  52                 return 1;
  53         }
  54
  55         switch (align & 0x70) {
  56         case GP_VALIGN_ABOVE:
  57                 *topleft_y = y - height + 1;
  58                 break;
  59         case GP_VALIGN_CENTER:
  60                 *topleft_y = y - height/2;
  61                 break;
  62         case GP_VALIGN_BASELINE:
  63                 *topleft_y = y - GP_TextAscent(style) + 1;
  64                 break;
  65         case GP_VALIGN_BELOW:
  66                 *topleft_y = y;
  67                 break;
  68         default:
  69                 GP_DEBUG(1, "VALIGN 0x%0x\n", align);
  70                 return 1;
  71         }
  72
  73         return 0;
  74 }
  75
  76 void GP_Text(GP_Pixmap *pixmap, const GP_TextStyle *style,
  77              GP_Coord x, GP_Coord y, int align,
  78              GP_Pixel fg_color, GP_Pixel bg_color,
  79              const char *str)
  80 {
  81         GP_CHECK_PIXMAP(pixmap);
  82
  83         if (str == NULL)
  84                 return;
  85
  86         if (style == NULL)
  87                 style = &GP_DefaultStyle;
  88
  89         GP_Coord topleft_x, topleft_y;
  90
  91         GP_Size w = GP_TextWidth(style, str);
  92
  93         GP_ASSERT(do_align(&topleft_x, &topleft_y, align, x, y, style, w) == 0,
  94                  "Invalid aligment flags");
  95
  96         GP_Text_Raw(pixmap, style, topleft_x, topleft_y,
  97                     align & GP_TEXT_NOBG, fg_color, bg_color, str);
  98 }
  99
 100 GP_Size GP_VPrint(GP_Pixmap *pixmap, const GP_TextStyle *style,
 101                   GP_Coord x, GP_Coord y, int align,
 102                   GP_Pixel fg_color, GP_Pixel bg_color,
 103                   const char *fmt, va_list va)
 104 {
 105         va_list vac;
 106         int size;
 107
 108         va_copy(vac, va);
 109         size = vsnprintf(NULL, 0, fmt, va);
 110         char buf[size+1];
 111         vsnprintf(buf, sizeof(buf), fmt, vac);
 112         va_end(vac);
 113
 114         GP_Text(pixmap, style, x, y, align, fg_color, bg_color, buf);
 115
 116         return GP_TextWidth(style, buf);
 117 }
 118
 119 GP_Size GP_Print(GP_Pixmap *pixmap, const GP_TextStyle *style,
 120                  GP_Coord x, GP_Coord y, int align,
 121                  GP_Pixel fg_color, GP_Pixel bg_color, const char *fmt, ...)
 122 {
 123         va_list va;
 124         GP_Size ret;
 125
 126         va_start(va, fmt);
 127         ret = GP_VPrint(pixmap, style, x, y, align,
 128                         fg_color, bg_color, fmt, va);
 129         va_end(va);
 130
 131         return ret;
 132 }
 133
 134 void GP_TextClear(GP_Pixmap *pixmap, const GP_TextStyle *style,
 135                   GP_Coord x, GP_Coord y, int align,
 136                   GP_Pixel bg_color, GP_Size size)
 137 {
 138         GP_Coord topleft_x, topleft_y;
 139
 140         GP_ASSERT(do_align(&topleft_x, &topleft_y, align, x, y, style, size) == 0,
 141                  "Invalid aligment flags");
 142
 143         GP_FillRectXYWH(pixmap, topleft_x, topleft_y,
 144                         size, GP_TextHeight(style), bg_color);
 145 }
 146
 147 void GP_TextClearStr(GP_Pixmap *pixmap, const GP_TextStyle *style,
 148                      GP_Coord x, GP_Coord y, int align,
 149                      GP_Pixel bg_color, const char *str)
 150 {
 151         GP_TextClear(pixmap, style, x, y, align,
 152                      bg_color, GP_TextWidth(style, str));
 153 }