display-filter-high-contrast.c 8.2 KB
Newer Older
1
/* GIMP - The GNU Image Manipulation Program
2 3
 * Copyright (C) 1999 Manish Singh <yosh@gimp.org>
 *
4
 * This program is free software: you can redistribute it and/or modify
5
 * it under the terms of the GNU General Public License as published by
6
 * the Free Software Foundation; either version 3 of the License, or
7 8 9 10 11 12 13 14
 * (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
15
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16
 */
17

18 19
#include "config.h"

20 21
#include <gtk/gtk.h>

22
#include "libgimpcolor/gimpcolor.h"
23
#include "libgimpconfig/gimpconfig.h"
24
#include "libgimpmath/gimpmath.h"
25
#include "libgimpmodule/gimpmodule.h"
26
#include "libgimpwidgets/gimpwidgets.h"
27

28
#include "libgimp/libgimp-intl.h"
29 30


31
#define DEFAULT_CONTRAST 1.0
32 33


34
#define CDISPLAY_TYPE_CONTRAST            (cdisplay_contrast_get_type ())
35 36 37 38 39
#define CDISPLAY_CONTRAST(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), CDISPLAY_TYPE_CONTRAST, CdisplayContrast))
#define CDISPLAY_CONTRAST_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), CDISPLAY_TYPE_CONTRAST, CdisplayContrastClass))
#define CDISPLAY_IS_CONTRAST(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CDISPLAY_TYPE_CONTRAST))
#define CDISPLAY_IS_CONTRAST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CDISPLAY_TYPE_CONTRAST))

40

41 42
typedef struct _CdisplayContrast      CdisplayContrast;
typedef struct _CdisplayContrastClass CdisplayContrastClass;
43

44
struct _CdisplayContrast
45
{
46
  GimpColorDisplay  parent_instance;
47

48
  gdouble           contrast;
49
  guchar            lookup[256];
50 51
};

52
struct _CdisplayContrastClass
53
{
54
  GimpColorDisplayClass  parent_instance;
55 56
};

57

58 59 60 61 62 63 64
enum
{
  PROP_0,
  PROP_CONTRAST
};


65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
GType              cdisplay_contrast_get_type        (void);

static void        cdisplay_contrast_set_property    (GObject          *object,
                                                      guint             property_id,
                                                      const GValue     *value,
                                                      GParamSpec       *pspec);
static void        cdisplay_contrast_get_property    (GObject          *object,
                                                      guint             property_id,
                                                      GValue           *value,
                                                      GParamSpec       *pspec);

static void        cdisplay_contrast_convert_surface (GimpColorDisplay *display,
                                                      cairo_surface_t  *surface);
static GtkWidget * cdisplay_contrast_configure       (GimpColorDisplay *display);
static void        cdisplay_contrast_set_contrast    (CdisplayContrast *contrast,
                                                      gdouble           value);
81 82


83
static const GimpModuleInfo cdisplay_contrast_info =
84
{
85
  GIMP_MODULE_ABI_VERSION,
86
  N_("High Contrast color display filter"),
87
  "Jay Cox <jaycox@gimp.org>",
88
  "v0.2",
89
  "(c) 2000, released under the GPL",
90
  "October 14, 2000"
91 92
};

93 94
G_DEFINE_DYNAMIC_TYPE (CdisplayContrast, cdisplay_contrast,
                       GIMP_TYPE_COLOR_DISPLAY)
95 96


97 98 99 100 101 102
G_MODULE_EXPORT const GimpModuleInfo *
gimp_module_query (GTypeModule *module)
{
  return &cdisplay_contrast_info;
}

103
G_MODULE_EXPORT gboolean
104
gimp_module_register (GTypeModule *module)
105
{
106
  cdisplay_contrast_register_type (module);
107 108

  return TRUE;
109 110
}

111 112
static void
cdisplay_contrast_class_init (CdisplayContrastClass *klass)
113
{
114 115
  GObjectClass          *object_class  = G_OBJECT_CLASS (klass);
  GimpColorDisplayClass *display_class = GIMP_COLOR_DISPLAY_CLASS (klass);
116

117 118
  object_class->get_property     = cdisplay_contrast_get_property;
  object_class->set_property     = cdisplay_contrast_set_property;
119

120 121 122
  GIMP_CONFIG_INSTALL_PROP_DOUBLE (object_class, PROP_CONTRAST,
                                   "contrast", NULL,
                                   0.01, 10.0, DEFAULT_CONTRAST,
123
                                   0);
124

125 126 127
  display_class->name            = _("Contrast");
  display_class->help_id         = "gimp-colordisplay-contrast";
  display_class->stock_id        = GIMP_STOCK_DISPLAY_FILTER_CONTRAST;
128

129 130
  display_class->convert_surface = cdisplay_contrast_convert_surface;
  display_class->configure       = cdisplay_contrast_configure;
131 132
}

133 134 135 136 137 138 139 140 141 142
static void
cdisplay_contrast_class_finalize (CdisplayContrastClass *klass)
{
}

static void
cdisplay_contrast_init (CdisplayContrast *contrast)
{
}

143
static void
144 145 146 147
cdisplay_contrast_get_property (GObject    *object,
                                guint       property_id,
                                GValue     *value,
                                GParamSpec *pspec)
148
{
Sven Neumann's avatar
Sven Neumann committed
149
  CdisplayContrast *contrast = CDISPLAY_CONTRAST (object);
150

151
  switch (property_id)
152
    {
153 154 155 156 157 158
    case PROP_CONTRAST:
      g_value_set_double (value, contrast->contrast);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
159 160 161
    }
}

162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
static void
cdisplay_contrast_set_property (GObject      *object,
                                guint         property_id,
                                const GValue *value,
                                GParamSpec   *pspec)
{
  CdisplayContrast *contrast = CDISPLAY_CONTRAST (object);

  switch (property_id)
    {
    case PROP_CONTRAST:
      cdisplay_contrast_set_contrast (contrast, g_value_get_double (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}
180

181
static void
182 183
cdisplay_contrast_convert_surface (GimpColorDisplay *display,
                                   cairo_surface_t  *surface)
184
{
Sven Neumann's avatar
Sven Neumann committed
185
  CdisplayContrast *contrast = CDISPLAY_CONTRAST (display);
186 187 188 189 190 191 192 193 194 195
  gint              width    = cairo_image_surface_get_width (surface);
  gint              height   = cairo_image_surface_get_height (surface);
  gint              stride   = cairo_image_surface_get_stride (surface);
  guchar           *buf      = cairo_image_surface_get_data (surface);
  cairo_format_t    fmt      = cairo_image_surface_get_format (surface);
  gint              i, j, skip;
  gint              r, g, b, a;

  if (fmt != CAIRO_FORMAT_ARGB32)
    return;
196

197
  /* You will not be using the entire buffer most of the time.
198 199 200 201 202 203 204 205 206 207
   * Hence, the simplistic code for this is as follows:
   *
   * for (j = 0; j < height; j++)
   *   {
   *     for (i = 0; i < width * bpp; i++)
   *       buf[i] = lookup[buf[i]];
   *     buf += bpl;
   *   }
   */

208 209
  j = height;
  skip = stride - 4 * width;
210 211 212 213 214

  while (j--)
    {
      i = width;
      while (i--)
215
        {
216 217 218 219 220 221
          GIMP_CAIRO_ARGB32_GET_PIXEL (buf, r, g, b, a);
          r = contrast->lookup[r];
          g = contrast->lookup[g];
          b = contrast->lookup[b];
          GIMP_CAIRO_ARGB32_SET_PIXEL (buf, r, g, b, a);
          buf += 4;
222
        }
223
      buf += skip;
224 225 226
    }
}

227 228
static GtkWidget *
cdisplay_contrast_configure (GimpColorDisplay *display)
229
{
Sven Neumann's avatar
Sven Neumann committed
230
  CdisplayContrast *contrast = CDISPLAY_CONTRAST (display);
231
  GtkWidget        *hbox;
232
  GtkWidget        *label;
233
  GtkWidget        *spinbutton;
234

235
  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
236

237
  label = gtk_label_new_with_mnemonic (_("Contrast c_ycles:"));
238
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
239 240
  gtk_widget_show (label);

241 242
  spinbutton = gimp_prop_spin_button_new (G_OBJECT (contrast), "contrast",
                                          0.1, 1.0, 3);
243
  gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
244 245
  gtk_widget_show (spinbutton);

246 247
  gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton);

248
  return hbox;
249 250 251
}

static void
252 253
cdisplay_contrast_set_contrast (CdisplayContrast *contrast,
                                gdouble           value)
254
{
255 256
  if (value <= 0.0)
    value = 1.0;
257

258
  if (value != contrast->contrast)
259
    {
260 261 262 263 264 265 266 267 268 269 270 271
      gint i;

      contrast->contrast = value;

      for (i = 0; i < 256; i++)
        {
          contrast->lookup[i] = (guchar) (gint)
            (255 * .5 * (1 + sin (value * 2 * G_PI * i / 255.0)));
        }

      g_object_notify (G_OBJECT (contrast), "contrast");
      gimp_color_display_changed (GIMP_COLOR_DISPLAY (contrast));
272 273
    }
}