dw_image.c

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/*
 * File: dw_image.c
 *
 * Copyright (C) 2001 Sebastian Geerken  <[e-mail]>,
 *                    Jorge Arellano Cid <[e-mail]>
 *
 * 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.
 */

#include "msg.h"
#include "dw_image.h"
#include "dw_gtk_viewport.h"
#include "prefs.h"
#include "dw_marshal.h"
#include "list.h"
#include "dicache.h"
#include "debug.h"
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include <stdio.h>
#include <string.h>

static void Dw_image_init               (DwImage *image);
static void Dw_image_class_init         (DwImageClass *klass);

static void Dw_image_destroy            (GtkObject *object);

static void Dw_image_size_request       (DwWidget *widget,
                                         DwRequisition *requisition);
static void Dw_image_size_allocate      (DwWidget *widget,
                                         DwAllocation *allocation);
static void Dw_image_draw               (DwWidget *widget,
                                         DwRectangle *area,
                                         GdkEventExpose *event);
static gboolean Dw_image_button_press   (DwWidget *widget,
                                         gint32 x,
                                         gint32 y,
                                         GdkEventButton *event);
static gboolean Dw_image_button_release (DwWidget *widget,
                                         gint32 x,
                                         gint32 y,
                                         GdkEventButton *event);
static gboolean Dw_image_motion_notify  (DwWidget *widget,
                                         gint32 x,
                                         gint32 y,
                                         GdkEventMotion *event);
static gboolean Dw_image_enter_notify   (DwWidget *widget,
                                         DwWidget *last_widget,
                                         GdkEventMotion *event);
static gboolean Dw_image_leave_notify   (DwWidget *widget,
                                         DwWidget *next_widget,
                                         GdkEventMotion *event);
static DwIterator* Dw_image_iterator    (DwWidget *widget,
                                         gint32 mask,
                                         gboolean at_end);
static void Dw_image_iterator_highlight (DwIterator *it,
                                         gint start,
                                         gint end,
                                         DwHighlightLayer layer);

static void Dw_image_find_link          (DwImage *image,
                                         gint x, gint y,
                                         gint *link,
                                         gint *link_x, gint *link_y);
static void Dw_image_scale_row          (DwImage *image, gint y_dest);
static void Dw_image_scale              (DwImage *image);

static gint Dw_image_map_list_find_link (DwImageMapList *list,
                                         DilloUrl *url,
                                         gint x,
                                         gint y);


#define Dw_image_scaled_y(image, y_src) \
   ( (y_src) * ( ((DwWidget*)(image))->allocation.ascent +  \
                 ((DwWidget*)(image))->allocation.descent - \
                 p_Dw_style_box_diff_height ( ((DwWidget*)(image))->style ) ) \
             / ((DwImage*)(image))->height )


enum
{
   LINK_ENTERED,
   LINK_PRESSED,
   LINK_RELEASED,
   LINK_CLICKED,
   LAST_SIGNAL
};

static guint image_signals[LAST_SIGNAL] = { 0 };
static DwWidgetClass *parent_class;


/*
 * Standard Gtk+ function.
 */
GtkType a_Dw_image_get_type (void)
{
   static GtkType type = 0;

   if (!type) {
      GtkTypeInfo info = {
         "DwImage",
         sizeof (DwImage),
         sizeof (DwImageClass),
         (GtkClassInitFunc) Dw_image_class_init,
         (GtkObjectInitFunc) Dw_image_init,
         (GtkArgSetFunc) NULL,
         (GtkArgGetFunc) NULL,
         (GtkClassInitFunc) NULL
      };

      type = gtk_type_unique (DW_TYPE_WIDGET, &info);
   }

   return type;
}


/*
 * Standard Gtk+ function.
 */
DwWidget* a_Dw_image_new (DwImageType type, const gchar *alt_text)
{
   GtkObject *object;
   DwImage *image;

   object = gtk_object_new (DW_TYPE_IMAGE, NULL);
   DBG_OBJ_CREATE (object, "DwImage");
   image = DW_IMAGE(object);
   image->alt_text = g_strdup (alt_text);
   return DW_WIDGET (object);
}


/*
 * Standard Gtk+ function.
 */
static void Dw_image_init (DwImage *image)
{
   int i;

   image->url = NULL;
   image->width = 0;
   image->height = 0;
   image->alt_text_width = -1; /* not yet calculated */
   image->buffer = NULL;
   image->scaled_buffer = NULL;
   image->alt_text = NULL;
   image->usemap_url = NULL;
   image->ismap = FALSE;
   for (i = 0; i < DW_HIGHLIGHT_NUM_LAYERS; i++)
      image->selected[i] = FALSE;
}


/*
 * Standard Gtk+ function.
 */
static void Dw_image_class_init (DwImageClass *klass)
{
   GtkObjectClass *object_class;
   DwWidgetClass *widget_class;

   parent_class = gtk_type_class (DW_TYPE_WIDGET);

   object_class = (GtkObjectClass*)klass;
   object_class->destroy = Dw_image_destroy;

   image_signals[LINK_ENTERED] =
      gtk_signal_new ("link_entered",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwImageClass, link_entered),
                      p_Dw_marshal_link_enter,
                      GTK_TYPE_BOOL,
                      3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT);
   image_signals[LINK_PRESSED] =
      gtk_signal_new ("link_pressed",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwImageClass, link_pressed),
                      p_Dw_marshal_link_button,
                      GTK_TYPE_BOOL,
                      4, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT,
                      GTK_TYPE_GDK_EVENT);
   image_signals[LINK_RELEASED] =
      gtk_signal_new ("link_released",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwImageClass, link_released),
                      p_Dw_marshal_link_button,
                      GTK_TYPE_BOOL,
                      4, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT,
                      GTK_TYPE_GDK_EVENT);
   image_signals[LINK_CLICKED] =
      gtk_signal_new ("link_clicked",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwImageClass, link_clicked),
                      p_Dw_marshal_link_button,
                      GTK_TYPE_BOOL,
                      4, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT,
                      GTK_TYPE_GDK_EVENT);
   gtk_object_class_add_signals (object_class, image_signals, LAST_SIGNAL);

   widget_class = (DwWidgetClass*)klass;
   widget_class->size_request = Dw_image_size_request;
   widget_class->size_allocate = Dw_image_size_allocate;
   widget_class->draw = Dw_image_draw;
   widget_class->button_press_event = Dw_image_button_press;
   widget_class->button_release_event = Dw_image_button_release;
   widget_class->motion_notify_event = Dw_image_motion_notify;
   widget_class->enter_notify_event = Dw_image_enter_notify;
   widget_class->leave_notify_event = Dw_image_leave_notify;
   widget_class->iterator = Dw_image_iterator;
}


/*
 * Standard Gtk+ function.
 */
static void Dw_image_destroy (GtkObject *object)
{
   DwImage *image = DW_IMAGE (object);

   if (image->usemap_url)
      a_Url_free (image->usemap_url);
   if (image->url)
      a_Dicache_unref (image->url, image->version);
   g_free (image->alt_text);
   g_free (image->scaled_buffer);

   GTK_OBJECT_CLASS(parent_class)->destroy (object);
}


/*
 * Standard Dw function.
 */
static void Dw_image_size_request (DwWidget *widget,
                                   DwRequisition *requisition)
{
   DwImage *image;

   image = DW_IMAGE (widget);

   if (image->buffer != NULL ||
       (image->alt_text == NULL || image->alt_text[0] == '\0')) {
      requisition->width = image->width;
      requisition->ascent = image->height;
      requisition->descent = 0;
   } else {
      if (image->alt_text_width == -1)
         image->alt_text_width =
            gdk_string_width (widget->style->font->font, image->alt_text);

      requisition->width = image->alt_text_width;
      requisition->ascent = widget->style->font->font->ascent;
      requisition->descent = widget->style->font->font->descent;
   }

   requisition->width += p_Dw_style_box_diff_width (widget->style);
   requisition->ascent += p_Dw_style_box_offset_y (widget->style);
   requisition->descent += p_Dw_style_box_rest_height (widget->style);
}


/*
 * Standard Dw function.
 */
static void Dw_image_size_allocate (DwWidget *widget,
                                    DwAllocation *allocation)
{
   DwImage *image;

   /* if image is moved only */
   if (allocation->width == widget->allocation.width &&
       allocation->ascent + allocation->descent == DW_WIDGET_HEIGHT(widget))
      return;

   /* this is also done in a_Dw_widget_size_allocate, but
      Dw_image_scale needs this. */
   widget->allocation = *allocation;

   image = DW_IMAGE (widget);
   if (image->buffer != NULL && image->width > 0 && image->height > 0)
      Dw_image_scale (image);
}


/*
 * Standard Dw function.
 */
static void Dw_image_draw (DwWidget *widget,
                           DwRectangle *area,
                           GdkEventExpose *event)
{
   gint32 vx, vy;
   DwRectangle content, intersection;
   GdkGC *gc;
   DwImage *image = DW_IMAGE (widget);
   guchar *buffer, *bstart;
   int i;
   gboolean selected = FALSE;

   if (image->buffer) {
      p_Dw_widget_draw_widget_box (widget, area, FALSE);

      content.x = p_Dw_style_box_offset_x (widget->style);
      content.y = p_Dw_style_box_offset_y (widget->style);
      content.width = DW_WIDGET_CONTENT_WIDTH(widget);
      content.height = DW_WIDGET_CONTENT_HEIGHT(widget);

      if (p_Dw_rectangle_intersect (area, &content, &intersection)) {
         vx = p_Dw_widget_x_world_to_viewport (widget, widget->allocation.x);
         vy = p_Dw_widget_y_world_to_viewport (widget, widget->allocation.y);
         gc = widget->style->color->gc;

         if (image->scaled_buffer)
            buffer = image->scaled_buffer;
         else
            buffer = image->buffer;

         bstart = buffer +
            3 * ( intersection.x - p_Dw_style_box_offset_x (widget->style)+
                  content.width * (intersection.y -
                                   p_Dw_style_box_offset_y (widget->style)) );

         gdk_draw_rgb_image (
            DW_WIDGET_WINDOW (widget), gc,
            vx + intersection.x, vy + intersection.y,
            intersection.width, intersection.height, GDK_RGB_DITHER_MAX,
            bstart, content.width * 3);
      }
   } else {
      if (image->alt_text && image->alt_text[0]) {
         if (image->alt_text_width == -1)
            image->alt_text_width =
               gdk_string_width (widget->style->font->font, image->alt_text);

         if (widget->allocation.width < image->alt_text_width ||
             widget->allocation.ascent + widget->allocation.descent
             < widget->style->font->font->ascent
             + widget->style->font->font->descent)
            p_Dw_widget_will_clip (widget);

         p_Dw_widget_draw_widget_box (widget, area, FALSE);
         gdk_draw_string
            (DW_WIDGET_WINDOW (widget), widget->style->font->font,
             widget->style->color->gc,
             p_Dw_widget_x_world_to_viewport (widget, widget->allocation.x),
             p_Dw_widget_y_world_to_viewport (widget, widget->allocation.y)
             + widget->style->font->font->ascent,
             image->alt_text);
      }
   }

   for (i = 0; i < DW_HIGHLIGHT_NUM_LAYERS && !selected; i++)
      selected = image->selected[i];
   if (selected)
      p_Dw_widget_draw_selected (widget, area);
}


/*
 * Standard Dw function.
 */
static gboolean Dw_image_enter_notify (DwWidget *widget,
                                       DwWidget *last_widget,
                                       GdkEventMotion *event)
{
   return FALSE;
}


/*
 * Standard Dw function.
 */
static gboolean Dw_image_leave_notify (DwWidget *widget,
                                       DwWidget *next_widget,
                                       GdkEventMotion *event)
{
   DwImage *image = DW_IMAGE (widget);
   gboolean return_val = FALSE;

   if (image->hover_link != -1) {
      image->hover_link = -1;
      gtk_signal_emit (GTK_OBJECT (widget), image_signals[LINK_ENTERED],
                       -1, -1, -1, &return_val);
      return return_val;
   }

   return FALSE;
}


/*
 * Standard Dw function.
 */
static gboolean Dw_image_button_press (DwWidget *widget,
                                       gint32 x,
                                       gint32 y,
                                       GdkEventButton *event)
{
   DwImage *image = DW_IMAGE (widget);
   gint link_x, link_y;
   gboolean return_val = FALSE;

   Dw_image_find_link (image, x, y, &image->pressed_link, &link_x, &link_y);

   if (image->pressed_link >= 0)
      gtk_signal_emit (GTK_OBJECT (widget), image_signals[LINK_PRESSED],
                       image->pressed_link, link_x, link_y, event,
                       &return_val);

   return return_val;
}


/*
 * Standard Dw function.
 */
static gboolean Dw_image_button_release (DwWidget *widget,
                                         gint32 x,
                                         gint32 y,
                                         GdkEventButton *event)
{
   DwImage *image = DW_IMAGE (widget);
   gint link_pressed, link_released, link_x, link_y;
   gboolean return_val1 = FALSE, return_val2 = FALSE;

   link_pressed = image->pressed_link;
   Dw_image_find_link (image, x, y, &link_released, &link_x, &link_y);
   image->pressed_link = -1;

   if (link_released >= 0) {
      gtk_signal_emit (GTK_OBJECT (widget), image_signals[LINK_RELEASED],
                       link_released, link_x, link_y, event, &return_val1);