gimp/app/widgets/gimptoolbox-color-area.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 <stdio.h>
#include <string.h> /* memcpy */

#ifdef HAVE_STRING_H
#include <string.h>
#endif

#include <gtk/gtk.h>

#include "libgimpcolor/gimpcolor.h"

#include "gui-types.h"

#include "core/gimp.h"
#include "core/gimpcontext.h"

#include "widgets/gimpdnd.h"

#include "color-area.h"
#include "color-notebook.h"

#ifdef DISPLAY_FILTERS
#include "gdisplay_color.h"
#endif /* DISPLAY_FILTERS */

#include "libgimp/gimpintl.h"


typedef enum
{
  FORE_AREA,
  BACK_AREA,
  SWAP_AREA,
  DEF_AREA,
  INVALID_AREA
} ColorAreaTarget;


/*  local function prototypes  */

static ColorAreaTarget   color_area_target (gint                x,
                                            gint                y);
static void   color_area_draw_rect         (GdkDrawable        *drawable,
                                            GdkGC              *gc,
                                            gint                x,
                                            gint                y,
                                            gint                width,
                                            gint                height,
                                            guchar              r,
                                            guchar              g,
                                            guchar              b);
static void   color_area_draw              (GimpContext        *context);
static void   color_area_select_callback   (ColorNotebook      *color_notebook,
                                            const GimpRGB      *color,
                                            ColorNotebookState  state,
                                            gpointer            data);
static void   color_area_edit              (GimpContext        *context);
static gint   color_area_events            (GtkWidget          *widget,
                                            GdkEvent           *event,
                                            gpointer            data);
static void   color_area_realize           (GtkWidget          *widget,
                                            gpointer            data);
static void   color_area_drop_color        (GtkWidget          *widget,
                                            const GimpRGB      *color,
                                            gpointer            data);
static void   color_area_drag_color        (GtkWidget          *widget,
                                            GimpRGB            *color,
                                            gpointer            data);
static void   color_area_color_changed     (GimpContext        *context,
                                            GimpRGB            *color,
                                            gpointer            data);


/*  Global variables  */
gint         active_color     = FOREGROUND;
GimpDisplay *color_area_gdisp = NULL;

/*  Static variables  */
static GdkGC         *color_area_gc     = NULL;
static GdkGC         *mask_gc           = NULL;

static GtkWidget     *color_area        = NULL;

static GdkPixmap     *color_area_pixmap = NULL;
static GdkBitmap     *color_area_mask   = NULL;
static GdkPixmap     *default_pixmap    = NULL;
static GdkBitmap     *default_mask      = NULL;
static GdkPixmap     *swap_pixmap       = NULL;
static GdkBitmap     *swap_mask         = NULL;

static ColorNotebook *color_notebook        = NULL;
static gboolean       color_notebook_active = FALSE;
static gint           edit_color;
static GimpRGB        revert_fg;
static GimpRGB        revert_bg;

/*  dnd stuff  */
static GtkTargetEntry color_area_target_table[] =
{
  GIMP_TARGET_COLOR
};


/*  public functions  */

GtkWidget *
color_area_create (GimpContext *context,
                   gint         width,
		   gint         height,
		   GdkPixmap   *default_pmap,
		   GdkBitmap   *default_msk,
		   GdkPixmap   *swap_pmap,
		   GdkBitmap   *swap_msk)
{
  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);

  color_area = gtk_drawing_area_new ();
  gtk_drawing_area_size (GTK_DRAWING_AREA (color_area), width, height);
  gtk_widget_set_events (color_area,
			 GDK_EXPOSURE_MASK |
			 GDK_BUTTON_PRESS_MASK |
			 GDK_BUTTON_RELEASE_MASK |
			 GDK_ENTER_NOTIFY_MASK |
			 GDK_LEAVE_NOTIFY_MASK);

#ifndef GDK_WINDOWING_DIRECTFB
  g_signal_connect (G_OBJECT (color_area), "event",
		    G_CALLBACK (color_area_events),
		    context);
#endif

  g_signal_connect (G_OBJECT (color_area), "realize",
		    G_CALLBACK (color_area_realize),
		    context);

  default_pixmap = default_pmap;
  default_mask   = default_msk;

  swap_pixmap    = swap_pmap;
  swap_mask      = swap_msk;

  /*  dnd stuff  */
  gtk_drag_source_set (color_area,
                       GDK_BUTTON1_MASK | GDK_BUTTON2_MASK,
                       color_area_target_table,
                       G_N_ELEMENTS (color_area_target_table),
                       GDK_ACTION_COPY | GDK_ACTION_MOVE);
  gimp_dnd_color_source_set (color_area, color_area_drag_color, context);

  gtk_drag_dest_set (color_area,
		     GTK_DEST_DEFAULT_HIGHLIGHT |
		     GTK_DEST_DEFAULT_MOTION |
		     GTK_DEST_DEFAULT_DROP,
		     color_area_target_table,
                     G_N_ELEMENTS (color_area_target_table),
		     GDK_ACTION_COPY);
  gimp_dnd_color_dest_set (color_area, color_area_drop_color, context);

  g_signal_connect (G_OBJECT (context), "foreground_changed",
		    G_CALLBACK (color_area_color_changed),
		    color_area);
  g_signal_connect (G_OBJECT (context), "background_changed",
		    G_CALLBACK (color_area_color_changed),
		    color_area);

#ifdef DISPLAY_FILTERS
  /* display filter dummy gdisplay */
  color_area_gdisp = g_new (GimpDisplay, 1);
  color_area_gdisp->cd_list = NULL;
  color_area_gdisp->cd_ui   = NULL;
  color_area_gdisp->gimage = g_new (GimpImage, 1);
  color_area_gdisp->gimage->base_type = RGB;
#endif /* DISPLAY_FILTERS */

  return color_area;
}


/*  private functions  */

static ColorAreaTarget
color_area_target (gint x,
		   gint y)
{
  gint rect_w, rect_h;
  gint width, height;

  gdk_drawable_get_size (color_area_pixmap, &width, &height);

  rect_w = width * 0.65;
  rect_h = height * 0.65;

  /*  foreground active  */
  if (x > 0 && x < rect_w &&
      y > 0 && y < rect_h)
    return FORE_AREA;
  else if (x > (width - rect_w) && x < width &&
	   y > (height - rect_h) && y < height)
    return BACK_AREA;
  else if (x > 0 && x < (width - rect_w) &&
	   y > rect_h && y < height)
    return DEF_AREA;
  else if (x > rect_w && x < width &&
	   y > 0 && y < (height - rect_h))
    return SWAP_AREA;
  else
    return -1;
}

static void
color_area_draw_rect (GdkDrawable *drawable,
		      GdkGC       *gc,
		      gint         x,
		      gint         y,
		      gint         width,
		      gint         height,
		      guchar       r,
		      guchar       g,
		      guchar       b)
{
  static guchar *color_area_rgb_buf = NULL;
  static gint    color_area_rgb_buf_size;
  static gint    rowstride;
  gint    xx, yy;
  guchar *bp;
#ifdef DISPLAY_FILTERS
  GList  *list;
#endif /* DISPLAY_FILTERS */

  rowstride = 3 * ((width + 3) & -4);

  if (color_area_rgb_buf == NULL ||
      color_area_rgb_buf_size < height * rowstride)
    {
      if (color_area_rgb_buf)
	g_free (color_area_rgb_buf);

      color_area_rgb_buf = 
        g_malloc (color_area_rgb_buf_size = rowstride * height);
    }

  bp = color_area_rgb_buf;
  for (xx = 0; xx < width; xx++)
    {
      *bp++ = r;
      *bp++ = g;
      *bp++ = b;
    }

  bp = color_area_rgb_buf;

#ifdef DISPLAY_FILTERS
  for (list = color_area_gdisp->cd_list; list; list = g_list_next (list))
    {
      ColorDisplayNode *node = (ColorDisplayNode *) list->data;

      node->cd_convert (node->cd_ID, bp, width, 1, 3, rowstride);
    }
#endif /* DISPLAY_FILTERS */

  for (yy = 1; yy < height; yy++)
    {
      bp += rowstride;
      memcpy (bp, color_area_rgb_buf, rowstride);
    }

  gdk_draw_rgb_image (drawable, gc, x, y, width, height,
		      GDK_RGB_DITHER_MAX,
		      color_area_rgb_buf,
		      rowstride);
}

static void
color_area_draw (GimpContext *context)
{
  gint      rect_w, rect_h;
  gint      width, height;
  gint      def_width, def_height;
  gint      swap_width, swap_height;
  GimpRGB   color;
  guchar    r, g, b;
  GdkColor  mask_pattern;

  /* Check we haven't gotten initial expose yet,
   * no point in drawing anything
   */
  if (!color_area_pixmap || !color_area_gc)
    return;

  gdk_drawable_get_size (color_area_pixmap, &width, &height);

  rect_w = width * 0.65;
  rect_h = height * 0.65;

  /*  initialize the mask to transparent  */
  mask_pattern.pixel = 0;
  gdk_gc_set_foreground (mask_gc, &mask_pattern);
  gdk_draw_rectangle (color_area_mask, mask_gc, TRUE, 0, 0, -1, -1);

  /*  set the mask's gc to opaque  */
  mask_pattern.pixel = 1;
  gdk_gc_set_foreground (mask_gc, &mask_pattern);

  /*  draw the background area  */
  gimp_context_get_background (context, &color);
  gimp_rgb_get_uchar (&color, &r, &g, &b);
  color_area_draw_rect (color_area_pixmap, color_area_gc,
			(width - rect_w), (height - rect_h), rect_w, rect_h,
			r, g, b);
  gdk_draw_rectangle (color_area_mask, mask_gc, TRUE,
		      (width - rect_w), (height - rect_h), rect_w, rect_h);

  if (active_color == FOREGROUND)
    gtk_draw_shadow (color_area->style, color_area_pixmap,
		     GTK_STATE_NORMAL, GTK_SHADOW_OUT,
		     (width - rect_w), (height - rect_h), rect_w, rect_h);
  else
    gtk_draw_shadow (color_area->style, color_area_pixmap,
		     GTK_STATE_NORMAL, GTK_SHADOW_IN,
		     (width - rect_w), (height - rect_h), rect_w, rect_h);

  /*  draw the foreground area  */
  gimp_context_get_foreground (context, &color);
  gimp_rgb_get_uchar (&color, &r, &g, &b);
  color_area_draw_rect (color_area_pixmap, color_area_gc,
			0, 0, rect_w, rect_h,
			r, g, b);
  gdk_draw_rectangle (color_area_mask, mask_gc, TRUE,
		      0, 0, rect_w, rect_h);

  if (active_color == FOREGROUND)
    gtk_draw_shadow (color_area->style, color_area_pixmap,
		     GTK_STATE_NORMAL, GTK_SHADOW_IN,
		     0, 0, rect_w, rect_h);
  else
    gtk_draw_shadow (color_area->style, color_area_pixmap,
		     GTK_STATE_NORMAL, GTK_SHADOW_OUT,
		     0, 0, rect_w, rect_h);

  /*  draw the default pixmap  */
  gdk_drawable_get_size (default_pixmap, &def_width, &def_height);
  gdk_draw_drawable (color_area_pixmap, color_area_gc, default_pixmap,
		     0, 0, 0, height - def_height, def_width, def_height);
  gdk_draw_drawable (color_area_mask, mask_gc, default_mask,
		     0, 0, 0, height - def_height, def_width, def_height);

  /*  draw the swap pixmap  */
  gdk_drawable_get_size (swap_pixmap, &swap_width, &swap_height);
  gdk_draw_drawable (color_area_pixmap, color_area_gc, swap_pixmap,
		     0, 0, width - swap_width, 0, swap_width, swap_height);
  gdk_draw_drawable (color_area_mask, mask_gc, swap_mask,
		     0, 0, width - swap_width, 0, swap_width, swap_height);

  /*  draw the widget  */
  gdk_gc_set_clip_mask (color_area_gc, color_area_mask);
  gdk_gc_set_clip_origin (color_area_gc, 0, 0);
  gdk_draw_drawable (color_area->window, color_area_gc, color_area_pixmap,
		     0, 0, 0, 0, width, height);

  /*  reset the clip mask  */
  gdk_gc_set_clip_mask (color_area_gc, NULL);
}

static void
color_area_select_callback (ColorNotebook      *color_notebook,
			    const GimpRGB      *color,
			    ColorNotebookState  state,
			    gpointer            data)
{
  GimpContext *context;

  context = GIMP_CONTEXT (data);

  if (color_notebook)
    {
      switch (state)
	{
	case COLOR_NOTEBOOK_OK:
	  color_notebook_hide (color_notebook);
	  color_notebook_active = FALSE;
	  /* Fallthrough */
	case COLOR_NOTEBOOK_UPDATE:
	  if (edit_color == FOREGROUND)
	    gimp_context_set_foreground (context, color);
	  else
	    gimp_context_set_background (context, color);
	  break;
	case COLOR_NOTEBOOK_CANCEL:
	  color_notebook_hide (color_notebook);
	  color_notebook_active = FALSE;
	  gimp_context_set_foreground (context, &revert_fg);
	  gimp_context_set_background (context, &revert_bg);
	}
    }
}

static void
color_area_edit (GimpContext *context)
{
  GimpRGB color;

  if (! color_notebook_active)
    {
      gimp_context_get_foreground (context, &revert_fg);
      gimp_context_get_background (context, &revert_bg);
    }

  if (active_color == FOREGROUND)
    gimp_context_get_foreground (context, &color);
  else
    gimp_context_get_background (context, &color);

  edit_color = active_color;

  if (! color_notebook)
    {
      color_notebook = color_notebook_new (_("Color Selection"),
					   (const GimpRGB *) &color,
					   color_area_select_callback,
					   context, TRUE, FALSE);
      color_notebook_active = TRUE;
    }
  else
    {
      if (! color_notebook_active)
	{
	  color_notebook_show (color_notebook);
	  color_notebook_active = TRUE;
	}
      else
	{
	  color_notebook_show (color_notebook);
	}

      color_notebook_set_color (color_notebook, &color);
    }
}

static gint
color_area_events (GtkWidget *widget,
		   GdkEvent  *event,
                   gpointer   data)
{
  GimpContext     *context;
  GdkEventButton  *bevent;
  ColorAreaTarget  target;

  static ColorAreaTarget press_target = INVALID_AREA;

  context = GIMP_CONTEXT (data);

  switch (event->type)
    {
    case GDK_CONFIGURE:
      if (color_area_pixmap)
	{
	  g_object_unref (color_area_pixmap);
	  g_object_unref (color_area_mask);
	}

      color_area_pixmap = gdk_pixmap_new (widget->window,
					  widget->allocation.width,
					  widget->allocation.height, -1);
      color_area_mask = gdk_pixmap_new (widget->window,
					widget->allocation.width,
					widget->allocation.height, 1);
      break;

    case GDK_EXPOSE:
      if (GTK_WIDGET_DRAWABLE (widget))
	{
	  if (!color_area_gc)
	    {
	      color_area_gc = gdk_gc_new (widget->window);
	      mask_gc = gdk_gc_new (color_area_mask);
	    }

	  color_area_draw (context);
	}
      break;

    case GDK_BUTTON_PRESS:
      bevent = (GdkEventButton *) event;

      if (bevent->button == 1)
	{
	  target = color_area_target (bevent->x, bevent->y);
	  press_target = INVALID_AREA;

	  switch (target)
	    {
	    case FORE_AREA:
	    case BACK_AREA:
	      if (target != active_color)
		{
		  active_color = target;
		  color_area_draw (context);
		}
	      else
		{
		  press_target = target;
		}
	      break;
	    case SWAP_AREA:
	      gimp_context_swap_colors (context);
	      break;
	    case DEF_AREA:
	      gimp_context_set_default_colors (context);
	      break;
	    default:
	      break;
	    }
	}
      break;

    case GDK_BUTTON_RELEASE:
      bevent = (GdkEventButton *) event;

      if (bevent->button == 1)
	{
	  target = color_area_target (bevent->x, bevent->y);

	  if (target == press_target)
	    {
	      switch (target)
		{
		case FORE_AREA:
		case BACK_AREA:
		  color_area_edit (context);
		  break;
		default:
		  break;
		}
	    }
	  press_target = INVALID_AREA;
	}
      break;

    case GDK_LEAVE_NOTIFY:
      press_target = INVALID_AREA;
      break;

    default:
      break;
    }

  return FALSE;
}

static void
color_area_realize (GtkWidget *widget,
		    gpointer   data)
{
  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
  gdk_window_set_back_pixmap (widget->window, NULL, TRUE);
}

static void
color_area_drag_color (GtkWidget *widget,
		       GimpRGB   *color,
		       gpointer   data)
{
  GimpContext *context;

  context = GIMP_CONTEXT (data);

  if (active_color == FOREGROUND)
    gimp_context_get_foreground (context, color);
  else
    gimp_context_get_background (context, color);
}

static void
color_area_drop_color (GtkWidget     *widget,
		       const GimpRGB *color,
		       gpointer       data)
{
  GimpContext *context;

  context = GIMP_CONTEXT (data);

  if (color_notebook_active &&
      active_color == edit_color)
    {
      color_notebook_set_color (color_notebook, color);
    }
  else
    {
      if (active_color == FOREGROUND)
	gimp_context_set_foreground (context, color);
      else
	gimp_context_set_background (context, color);
    }
}

static void
color_area_color_changed (GimpContext *context,
			  GimpRGB     *color,
			  gpointer     data)
{
  color_area_draw (context);
}