path: root/src/theme.c

/* Metacity Theme Rendering */

/*
 * Copyright (C) 2001 Havoc Pennington
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>
#include "theme.h"
#include "theme-parser.h"
#include "util.h"
#include "gradient.h"
#include <gtk/gtkwidget.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>

#define GDK_COLOR_RGBA(color)                                           \
                         ((guint32) (0xff                         |     \
                                     (((color).red / 256) << 24)   |    \
                                     (((color).green / 256) << 16) |    \
                                     (((color).blue / 256) << 8)))

#define GDK_COLOR_RGB(color)                                            \
                         ((guint32) ((((color).red / 256) << 16)   |    \
                                     (((color).green / 256) << 8)  |    \
                                     (((color).blue / 256))))

#define ALPHA_TO_UCHAR(d) ((unsigned char) ((d) * 255))

#define DEBUG_FILL_STRUCT(s) memset ((s), 0xef, sizeof (*(s)))
#define CLAMP_UCHAR(v) ((guchar) (CLAMP (((int)v), (int)0, (int)255)))
#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)

static void gtk_style_shade		(GdkColor	 *a,
					 GdkColor	 *b,
					 gdouble	  k);
static void rgb_to_hls			(gdouble	 *r,
					 gdouble	 *g,
					 gdouble	 *b);
static void hls_to_rgb			(gdouble	 *h,
					 gdouble	 *l,
					 gdouble	 *s);

static GdkPixbuf *
colorize_pixbuf (GdkPixbuf *orig,
                 GdkColor  *new_color)
{
  GdkPixbuf *pixbuf;
  double intensity;
  int x, y;
  const guchar *src;
  guchar *dest;
  int orig_rowstride;
  int dest_rowstride;
  int width, height;
  gboolean has_alpha;
  const guchar *src_pixels;
  guchar *dest_pixels;
  
  pixbuf = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (orig), gdk_pixbuf_get_has_alpha (orig),
			   gdk_pixbuf_get_bits_per_sample (orig),
			   gdk_pixbuf_get_width (orig), gdk_pixbuf_get_height (orig));

  if (pixbuf == NULL)
    return NULL;
  
  orig_rowstride = gdk_pixbuf_get_rowstride (orig);
  dest_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
  width = gdk_pixbuf_get_width (pixbuf);
  height = gdk_pixbuf_get_height (pixbuf);
  has_alpha = gdk_pixbuf_get_has_alpha (orig);
  src_pixels = gdk_pixbuf_get_pixels (orig);
  dest_pixels = gdk_pixbuf_get_pixels (pixbuf);
  
  for (y = 0; y < height; y++)
    {
      src = src_pixels + y * orig_rowstride;
      dest = dest_pixels + y * dest_rowstride;

      for (x = 0; x < width; x++)
        {
          double dr, dg, db;
          
          intensity = INTENSITY (src[0], src[1], src[2]) / 255.0;

          if (intensity <= 0.5)
            {
              /* Go from black at intensity = 0.0 to new_color at intensity = 0.5 */
              dr = (new_color->red * intensity * 2.0) / 65535.0;
              dg = (new_color->green * intensity * 2.0) / 65535.0;
              db = (new_color->blue * intensity * 2.0) / 65535.0;
            }
          else
            {
              /* Go from new_color at intensity = 0.5 to white at intensity = 1.0 */
              dr = (new_color->red + (65535 - new_color->red) * (intensity - 0.5) * 2.0) / 65535.0;
              dg = (new_color->green + (65535 - new_color->green) * (intensity - 0.5) * 2.0) / 65535.0;
              db = (new_color->blue + (65535 - new_color->blue) * (intensity - 0.5) * 2.0) / 65535.0;
            }
          
          dest[0] = CLAMP_UCHAR (255 * dr);
          dest[1] = CLAMP_UCHAR (255 * dg);
          dest[2] = CLAMP_UCHAR (255 * db);
          
          if (has_alpha)
            {
              dest[3] = src[3];
              src += 4;
              dest += 4;
            }
          else
            {
              src += 3;
              dest += 3;
            }
        }
    }

  return pixbuf;
}

static void
color_composite (const GdkColor *bg,
                 const GdkColor *fg,
                 double          alpha_d,
                 GdkColor       *color)
{
  guint16 alpha;

  *color = *bg;
  alpha = alpha_d * 0xffff;
  color->red = color->red + (((fg->red - color->red) * alpha + 0x8000) >> 16);
  color->green = color->green + (((fg->green - color->green) * alpha + 0x8000) >> 16);
  color->blue = color->blue + (((fg->blue - color->blue) * alpha + 0x8000) >> 16);
}

static void
init_border (GtkBorder *border)
{
  border->top = -1;
  border->bottom = -1;
  border->left = -1;
  border->right = -1;
}

MetaFrameLayout*
meta_frame_layout_new  (void)
{
  MetaFrameLayout *layout;

  layout = g_new0 (MetaFrameLayout, 1);

  layout->refcount = 1;

  /* Fill with -1 values to detect invalid themes */
  layout->left_width = -1;
  layout->right_width = -1;
  layout->bottom_height = -1;

  init_border (&layout->title_border);

  layout->title_vertical_pad = -1;
  
  layout->right_titlebar_edge = -1;
  layout->left_titlebar_edge = -1;

  layout->button_sizing = META_BUTTON_SIZING_LAST;
  layout->button_aspect = 1.0;
  layout->button_width = -1;
  layout->button_height = -1;

  layout->has_title = TRUE;
  layout->title_scale = 1.0;
  
  init_border (&layout->button_border);

  return layout;
}

static gboolean
validate_border (const GtkBorder *border,
                 const char     **bad)
{
  *bad = NULL;
  
  if (border->top < 0)
    *bad = _("top");
  else if (border->bottom < 0)
    *bad = _("bottom");
  else if (border->left < 0)
    *bad = _("left");
  else if (border->right < 0)
    *bad = _("right");

  return *bad == NULL;
}

static gboolean
validate_geometry_value (int         val,
                         const char *name