Pileus Git - ~andy/gtk/blob - gtk/gtkcsstypes.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Benjamin Otte <otte@gnome.org>
   3  *
   4  * This library 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 of the License, or (at your option) any later version.
   8  *
   9  * This library 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 this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include "gtkcsstypesprivate.h"
  21 #include "gtkstylecontextprivate.h"
  22
  23 #define DEFINE_BOXED_TYPE_WITH_COPY_FUNC(TypeName, type_name) \
  24 \
  25 static TypeName * \
  26 type_name ## _copy (const TypeName *foo) \
  27 { \
  28   return g_memdup (foo, sizeof (TypeName)); \
  29 } \
  30 \
  31 G_DEFINE_BOXED_TYPE (TypeName, type_name, type_name ## _copy, g_free)
  32
  33 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBackgroundSize, _gtk_css_background_size)
  34 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBorderCornerRadius, _gtk_css_border_corner_radius)
  35 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBorderImageRepeat, _gtk_css_border_image_repeat)
  36 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssNumber, _gtk_css_number)
  37
  38 void
  39 _gtk_css_number_init (GtkCssNumber *number,
  40                       double        value,
  41                       GtkCssUnit    unit)
  42 {
  43   number->value = value;
  44   number->unit = unit;
  45 }
  46
  47 gboolean
  48 _gtk_css_number_equal (const GtkCssNumber *one,
  49                        const GtkCssNumber *two)
  50 {
  51   return one->unit == two->unit &&
  52          one->value == two->value;
  53 }
  54
  55 double
  56 _gtk_css_number_get (const GtkCssNumber *number,
  57                      double              one_hundred_percent)
  58 {
  59   if (number->unit == GTK_CSS_PERCENT)
  60     return number->value * one_hundred_percent * 0.01;
  61   else
  62     return number->value;
  63 }
  64
  65 gboolean
  66 _gtk_css_number_compute (GtkCssNumber       *dest,
  67                          const GtkCssNumber *src,
  68                          GtkStyleContext    *context)
  69 {
  70   switch (src->unit)
  71     {
  72     default:
  73       g_assert_not_reached();
  74       /* fall through */
  75     case GTK_CSS_PERCENT:
  76     case GTK_CSS_NUMBER:
  77     case GTK_CSS_PX:
  78     case GTK_CSS_DEG:
  79       dest->value = src->value;
  80       dest->unit = src->unit;
  81       break;
  82     case GTK_CSS_PT:
  83       dest->value = src->value * 96.0 / 72.0;
  84       dest->unit = GTK_CSS_PX;
  85       break;
  86     case GTK_CSS_PC:
  87       dest->value = src->value * 96.0 / 72.0 * 12.0;
  88       dest->unit = GTK_CSS_PX;
  89       break;
  90     case GTK_CSS_IN:
  91       dest->value = src->value * 96.0;
  92       dest->unit = GTK_CSS_PX;
  93       break;
  94     case GTK_CSS_CM:
  95       dest->value = src->value * 96.0 * 0.39370078740157477;
  96       dest->unit = GTK_CSS_PX;
  97       break;
  98     case GTK_CSS_MM:
  99       dest->value = src->value * 96.0 * 0.039370078740157477;
 100       dest->unit = GTK_CSS_PX;
 101       break;
 102     case GTK_CSS_EM:
 103       dest->value = src->value * _gtk_css_value_get_double (_gtk_style_context_peek_property (context, "font-size"));
 104       dest->unit = GTK_CSS_PX;
 105       break;
 106     case GTK_CSS_EX:
 107       /* for now we pretend ex is half of em */
 108       dest->value = src->value * _gtk_css_value_get_double (_gtk_style_context_peek_property (context, "font-size"));
 109       dest->unit = GTK_CSS_PX;
 110       break;
 111     case GTK_CSS_RAD:
 112       dest->value = 360 * src->value / (2 * G_PI);
 113       dest->unit = GTK_CSS_DEG;
 114       break;
 115     case GTK_CSS_GRAD:
 116       dest->value = 360 * src->value / 400.0;
 117       dest->unit = GTK_CSS_DEG;
 118       break;
 119     case GTK_CSS_TURN:
 120       dest->value = 360 * src->value;
 121       dest->unit = GTK_CSS_DEG;
 122       break;
 123     }
 124
 125   return !_gtk_css_number_equal (src, dest);
 126 }
 127
 128 void
 129 _gtk_css_number_print (const GtkCssNumber *number,
 130                        GString            *string)
 131 {
 132   char buf[G_ASCII_DTOSTR_BUF_SIZE];
 133
 134   const char *names[] = {
 135     /* [GTK_CSS_NUMBER] = */ "",
 136     /* [GTK_CSS_PERCENT] = */ "%",
 137     /* [GTK_CSS_PX] = */ "px",
 138     /* [GTK_CSS_PT] = */ "pt",
 139     /* [GTK_CSS_EM] = */ "em",
 140     /* [GTK_CSS_EX] = */ "ex",
 141     /* [GTK_CSS_PC] = */ "pc",
 142     /* [GTK_CSS_IN] = */ "in",
 143     /* [GTK_CSS_CM] = */ "cm",
 144     /* [GTK_CSS_MM] = */ "mm",
 145     /* [GTK_CSS_RAD] = */ "rad",
 146     /* [GTK_CSS_DEG] = */ "deg",
 147     /* [GTK_CSS_GRAD] = */ "grad",
 148     /* [GTK_CSS_TURN] = */ "turn",
 149   };
 150
 151   g_return_if_fail (number != NULL);
 152   g_return_if_fail (string != NULL);
 153
 154   g_ascii_dtostr (buf, sizeof (buf), number->value);
 155   g_string_append (string, buf);
 156   if (number->value != 0.0)
 157     g_string_append (string, names[number->unit]);
 158 }