image.c

Gqview,Linux下基于GTK+库写成的轻量级而能丰富的图像浏览程序。

}
#endif

/* this read ahead is located here merely for the callbacks, above */

static gint image_read_ahead_check(ImageWindow *imd)
{
	if (!imd->read_ahead_path) return FALSE;
	if (imd->il) return FALSE;

	if (!imd->image_path || strcmp(imd->read_ahead_path, imd->image_path) != 0)
		{
		image_read_ahead_cancel(imd);
		return FALSE;
		}

	if (imd->read_ahead_il)
		{
		imd->il = imd->read_ahead_il;
		imd->read_ahead_il = NULL;

		/* override the old signals */
		image_loader_set_area_ready_func(imd->il, image_load_area_cb, imd);
		image_loader_set_error_func(imd->il, image_load_error_cb, imd);
		image_loader_set_buffer_size(imd->il, IMAGE_LOAD_BUFFER_COUNT);

#ifdef IMAGE_THROTTLE_LARGER_IMAGES
		image_load_buffer_throttle(imd->il);
#endif

		/* do this one directly (probably should add a set func) */
		imd->il->func_done = image_load_done_cb;

		g_object_set(G_OBJECT(imd->pr), "loading", TRUE, NULL);

		if (!imd->delay_flip)
			{
			image_change_pixbuf(imd, image_loader_get_pixbuf(imd->il), image_zoom_get(imd));
			}

		image_read_ahead_cancel(imd);
		return TRUE;
		}
	else if (imd->read_ahead_pixbuf)
		{
		image_change_pixbuf(imd, imd->read_ahead_pixbuf, image_zoom_get(imd));
		g_object_unref(imd->read_ahead_pixbuf);
		imd->read_ahead_pixbuf = NULL;

		image_read_ahead_cancel(imd);

		image_post_process(imd, FALSE);
		return TRUE;
		}

	image_read_ahead_cancel(imd);
	return FALSE;
}

static gint image_load_begin(ImageWindow *imd, const gchar *path)
{
	if (debug) printf ("image begin \n");

	if (imd->il) return FALSE;

	imd->completed = FALSE;
	g_object_set(G_OBJECT(imd->pr), "complete", FALSE, NULL);

	if (image_post_buffer_get(imd))
		{
		if (debug) printf("from post buffer: %s\n", imd->image_path);
		return TRUE;
		}

	if (image_read_ahead_check(imd))
		{
		if (debug) printf("from read ahead buffer: %s\n", imd->image_path);
		return TRUE;
		}

	if (!imd->delay_flip && image_get_pixbuf(imd))
		{
		PixbufRenderer *pr;

		pr = PIXBUF_RENDERER(imd->pr);
		if (pr->pixbuf) g_object_unref(pr->pixbuf);
		pr->pixbuf = NULL;
		}

	g_object_set(G_OBJECT(imd->pr), "loading", TRUE, NULL);

	imd->il = image_loader_new(path);

	image_loader_set_area_ready_func(imd->il, image_load_area_cb, imd);
	image_loader_set_error_func(imd->il, image_load_error_cb, imd);
	image_loader_set_buffer_size(imd->il, IMAGE_LOAD_BUFFER_COUNT);

	if (!image_loader_start(imd->il, image_load_done_cb, imd))
		{
		if (debug) printf("image start error\n");

		g_object_set(G_OBJECT(imd->pr), "loading", FALSE, NULL);

		image_loader_free(imd->il);
		imd->il = NULL;

		image_complete_util(imd, FALSE);

		return FALSE;
		}

#ifdef IMAGE_THROTTLE_LARGER_IMAGES
	image_load_buffer_throttle(imd->il);
#endif

	if (!imd->delay_flip && !image_get_pixbuf(imd)) image_load_pixbuf_ready(imd);

	return TRUE;
}

static void image_reset(ImageWindow *imd)
{
	/* stops anything currently being done */

	if (debug) printf("image reset\n");

	g_object_set(G_OBJECT(imd->pr), "loading", FALSE, NULL);

	image_loader_free(imd->il);
	imd->il = NULL;

	imd->delay_alter_type = ALTER_NONE;
}

/*
 *-------------------------------------------------------------------
 * image changer
 *-------------------------------------------------------------------
 */

static void image_change_complete(ImageWindow *imd, gdouble zoom, gint new)
{
	image_reset(imd);

	if (imd->image_path && isfile(imd->image_path))
		{
		PixbufRenderer *pr;

		pr = PIXBUF_RENDERER(imd->pr);
		pr->zoom = zoom;	/* store the zoom, needed by the loader */

		if (image_load_begin(imd, imd->image_path))
			{
			imd->unknown = FALSE;
			}
		else
			{
			GdkPixbuf *pixbuf;

			pixbuf = pixbuf_inline(PIXBUF_INLINE_BROKEN);
			image_change_pixbuf(imd, pixbuf, zoom);
			g_object_unref(pixbuf);

			imd->unknown = TRUE;
			}
		imd->size = filesize(imd->image_path);
		imd->mtime = filetime(imd->image_path);
		}
	else
		{
		if (imd->image_path)
			{
			GdkPixbuf *pixbuf;

			pixbuf = pixbuf_inline(PIXBUF_INLINE_BROKEN);
			image_change_pixbuf(imd, pixbuf, zoom);
			g_object_unref(pixbuf);
			imd->mtime = filetime(imd->image_path);
			}
		else
			{
			image_change_pixbuf(imd, NULL, zoom);
			imd->mtime = 0;
			}
		imd->unknown = TRUE;
		imd->size = 0;
		}

	image_update_util(imd);
}

static void image_change_real(ImageWindow *imd, const gchar *path,
			      CollectionData *cd, CollectInfo *info, gdouble zoom)
{
	GdkPixbuf *pixbuf;
	GdkPixbuf *prev_pixbuf = NULL;
	gchar *prev_path = NULL;
	gint prev_clear = FALSE;

	imd->collection = cd;
	imd->collection_info = info;

	pixbuf = image_get_pixbuf(imd);

	if (enable_read_ahead && imd->image_path && pixbuf)
		{
		if (imd->il)
			{
			/* current image is not finished */
			prev_clear = TRUE;
			}
		else
			{
			prev_path = g_strdup(imd->image_path);
			prev_pixbuf = pixbuf;
			g_object_ref(prev_pixbuf);
			}
		}

	g_free(imd->image_path);
	imd->image_path = g_strdup(path);
	imd->image_name = filename_from_path(imd->image_path);

	image_change_complete(imd, zoom, TRUE);

	if (prev_pixbuf)
		{
		image_post_buffer_set(imd, prev_path, prev_pixbuf);
		g_free(prev_path);
		g_object_unref(prev_pixbuf);
		}
	else if (prev_clear)
		{
		image_post_buffer_set(imd, NULL, NULL);
		}

	image_update_title(imd);
	image_new_util(imd);
}

/*
 *-------------------------------------------------------------------
 * focus stuff
 *-------------------------------------------------------------------
 */

static void image_focus_paint(ImageWindow *imd, gint has_focus, GdkRectangle *area)
{
	GtkWidget *widget;

	widget = imd->widget;
	if (!widget->window) return;

	if (has_focus)
		{
		gtk_paint_focus (widget->style, widget->window, GTK_STATE_ACTIVE,
				 area, widget, "image_window",
				 widget->allocation.x, widget->allocation.y,
				 widget->allocation.width - 1, widget->allocation.height - 1);	
		}
	else
		{
		gtk_paint_shadow (widget->style, widget->window, GTK_STATE_NORMAL, GTK_SHADOW_IN,
				  area, widget, "image_window",
				  widget->allocation.x, widget->allocation.y,
				  widget->allocation.width - 1, widget->allocation.height - 1);
		}
}

static gint image_focus_expose(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
	ImageWindow *imd = data;

	image_focus_paint(imd, GTK_WIDGET_HAS_FOCUS(widget), &event->area);
	return TRUE;
}

static gint image_focus_in_cb(GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
	ImageWindow *imd = data;

	GTK_WIDGET_SET_FLAGS(imd->widget, GTK_HAS_FOCUS);
	image_focus_paint(imd, TRUE, NULL);

	return TRUE;
}

static gint image_focus_out_cb(GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
	ImageWindow *imd = data;

	GTK_WIDGET_UNSET_FLAGS(imd->widget, GTK_HAS_FOCUS);
	image_focus_paint(imd, FALSE, NULL);

	return TRUE;
}

gint image_overlay_add(ImageWindow *imd, GdkPixbuf *pixbuf, gint x, gint y,
		       gint relative, gint always)
{
	return pixbuf_renderer_overlay_add((PixbufRenderer *)imd->pr, pixbuf, x, y, relative, always);
}

void image_overlay_set(ImageWindow *imd, gint id, GdkPixbuf *pixbuf, gint x, gint y)
{
	pixbuf_renderer_overlay_set((PixbufRenderer *)imd->pr, id, pixbuf, x, y);
}

gint image_overlay_get(ImageWindow *imd, gint id, GdkPixbuf **pixbuf, gint *x, gint *y)
{
	return pixbuf_renderer_overlay_get((PixbufRenderer *)imd->pr, id, pixbuf, x, y);
}

void image_overlay_remove(ImageWindow *imd, gint id)
{
	pixbuf_renderer_overlay_remove((PixbufRenderer *)imd->pr, id);
}

static gint image_scroll_cb(GtkWidget *widget, GdkEventScroll *event, gpointer data)
{
	ImageWindow *imd = data;

	if (imd->func_scroll &&
	    event && event->type == GDK_SCROLL)
	        {
		imd->func_scroll(imd, event->direction, event->time,
				 event->x, event->y, event->state, imd->data_scroll);
		return TRUE;
		}

	return FALSE;
}

/*
 *-------------------------------------------------------------------
 * public interface
 *-------------------------------------------------------------------
 */

void image_attach_window(ImageWindow *imd, GtkWidget *window,
			 const gchar *title, const gchar *title_right, gint show_zoom)
{
	imd->top_window = window;
	g_free(imd->title);
	imd->title = g_strdup(title);
	g_free(imd->title_right);
	imd->title_right = g_strdup(title_right);
	imd->title_show_zoom = show_zoom;

	if (!fit_window) window = NULL;

	pixbuf_renderer_set_parent((PixbufRenderer *)imd->pr, (GtkWindow *)window);

	image_update_title(imd);
}

void image_set_update_func(ImageWindow *imd,
			   void (*func)(ImageWindow *imd, gpointer data),
			   gpointer data)
{
	imd->func_update = func;
	imd->data_update = data;
}

void image_set_complete_func(ImageWindow *imd,
			     void (*func)(ImageWindow *, gint preload, gpointer),
			     gpointer data)
{
	imd->func_complete = func;
	imd->data_complete = data;
}

void image_set_new_func(ImageWindow *imd,
			void (*func)(ImageWindow *, gpointer),
			gpointer data)
{
	imd->func_new = func;
	imd->data_new = data;
}


void image_set_button_func(ImageWindow *imd,
			   void (*func)(ImageWindow *, gint button, guint32 time, gdouble x, gdouble y, guint state, gpointer),
			   gpointer data)
{
	imd->func_button = func;
	imd->data_button = data;
}

void image_set_scroll_func(ImageWindow *imd,
			   void (*func)(ImageWindow *, GdkScrollDirection direction, guint32 time, gdouble x, gdouble y, guint state, gpointer),
			   gpointer data)
{
	imd->func_scroll = func;
	imd->data_scroll = data;
}

void image_set_scroll_notify_func(ImageWindow *imd,
				  void (*func)(ImageWindow *imd, gint x, gint y, gint width, gint height, gpointer data),
				  gpointer data)
{
	imd->func_scroll_notify = func;
	imd->data_scroll_notify = data;
}

/* path, name */

const gchar *image_get_path(ImageWindow *imd)
{
	return imd->image_path;
}

const gchar *image_get_name(ImageWindow *imd)
{
	return imd->image_name;
}

/* merely changes path string, does not change the image! */
void image_set_path(ImageWindow *imd, const gchar *newpath)
{
	g_free(imd->image_path);
	imd->image_path = g_strdup(newpath);
	imd->image_name = filename_from_path(imd->image_path);

	image_update_title(imd);
	image_new_util(imd);
}

/* load a new image */

void image_change_path(ImageWindow *imd, const gchar *path, gdouble zoom)
{
	if (imd->image_path == path ||
	    (path && imd->image_path && !strcmp(path, imd->image_path)) ) return;

	image_change_real(imd, path, NULL, NULL, zoom);
}

GdkPixbuf *image_get_pixbuf(ImageWindow *imd)
{
	return pixbuf_renderer_get_pixbuf((PixbufRenderer *)imd->pr);
}

void image_change_pixbuf(ImageWindow *imd, GdkPixbuf *pixbuf, gdouble zoom)
{
	pixbuf_renderer_set_pixbuf((PixbufRenderer *)imd->pr, pixbuf, zoom);
	image_new_util(imd);
}

void image_change_from_collection(ImageWindow *imd, CollectionData *cd, CollectInfo *info, gdouble zoom)
{
	if (!cd || !info || !g_list_find(cd->list, info)) return;

	image_change_real(imd, info->path, cd, info, zoom);
}

CollectionData *image_get_collection(ImageWindow *imd, CollectInfo **info)
{
	if (collection_to_number(imd->collection) >= 0)
		{
		if (g_list_find(imd->collection->list, imd->collection_info) != NULL)
			{
			if (info) *info = imd->collection_info;
			}
		else
			{
			if (info) *info = NULL;
			}
		return imd->collection;
		}

	if (info) *info = NULL;
	return NULL;
}

static void image_loader_sync_data(ImageLoader *il, gpointer data)
{
	/* change data for the callbacks directly */

	il->data_area_ready = data;
	il->data_error = data;
	il->data_done = data;
	il->data_percent = data;
}

/* this is more like a move function
 * it moves most data from source to imd
 */
void image_change_from_image(ImageWindow *imd, ImageWindow *source)
{
	if (imd == source) return;

	imd->unknown = source->unknown;

	imd->collection = source->collection;
	imd->collection_info = source->collection_info;