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。

	imd->size = source->size;
	imd->mtime = source->mtime;

	image_set_path(imd, image_get_path(source));

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

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

		image_loader_sync_data(imd->il, imd);

		imd->delay_alter_type = source->delay_alter_type;
		source->delay_alter_type = ALTER_NONE;
		}

	image_loader_free(imd->read_ahead_il);
	imd->read_ahead_il = source->read_ahead_il;
	source->read_ahead_il = NULL;
	if (imd->read_ahead_il) image_loader_sync_data(imd->read_ahead_il, imd);

	if (imd->read_ahead_pixbuf) g_object_unref(imd->read_ahead_pixbuf);
	imd->read_ahead_pixbuf = source->read_ahead_pixbuf;
	source->read_ahead_pixbuf = NULL;

	g_free(imd->read_ahead_path);
	imd->read_ahead_path = source->read_ahead_path;
	source->read_ahead_path = NULL;

	if (imd->prev_pixbuf) g_object_unref(imd->prev_pixbuf);
	imd->prev_pixbuf = source->prev_pixbuf;
	source->prev_pixbuf = NULL;

	g_free(imd->prev_path);
	imd->prev_path = source->prev_path;
	source->prev_path = NULL;

	imd->completed = source->completed;

	pixbuf_renderer_move(PIXBUF_RENDERER(imd->pr), PIXBUF_RENDERER(source->pr));
}

/* manipulation */

void image_area_changed(ImageWindow *imd, gint x, gint y, gint width, gint height)
{
	pixbuf_renderer_area_changed((PixbufRenderer *)imd->pr, x, y, width, height);
}

void image_reload(ImageWindow *imd)
{
	if (pixbuf_renderer_get_tiles((PixbufRenderer *)imd->pr)) return;

	image_change_complete(imd, image_zoom_get(imd), FALSE);
}

void image_scroll(ImageWindow *imd, gint x, gint y)
{
	pixbuf_renderer_scroll((PixbufRenderer *)imd->pr, x, y);
}

void image_scroll_to_point(ImageWindow *imd, gint x, gint y,
			   gdouble x_align, gdouble y_align)
{
	pixbuf_renderer_scroll_to_point((PixbufRenderer *)imd->pr, x, y, x_align, y_align);
}

void image_alter(ImageWindow *imd, AlterType type)
{
	if (pixbuf_renderer_get_tiles((PixbufRenderer *)imd->pr)) return;

	if (imd->il)
		{
		/* still loading, wait till done */
		imd->delay_alter_type = type;
		return;
		}

	image_alter_real(imd, type, TRUE);
}

void image_zoom_adjust(ImageWindow *imd, gdouble increment)
{
	pixbuf_renderer_zoom_adjust((PixbufRenderer *)imd->pr, increment);
}

void image_zoom_adjust_at_point(ImageWindow *imd, gdouble increment, gint x, gint y)
{
	pixbuf_renderer_zoom_adjust_at_point((PixbufRenderer *)imd->pr, increment, x, y);
}

void image_zoom_set_limits(ImageWindow *imd, gdouble min, gdouble max)
{
	pixbuf_renderer_zoom_set_limits((PixbufRenderer *)imd->pr, min, max);
}

void image_zoom_set(ImageWindow *imd, gdouble zoom)
{
	pixbuf_renderer_zoom_set((PixbufRenderer *)imd->pr, zoom);
}

void image_zoom_set_fill_geometry(ImageWindow *imd, gint vertical)
{
	PixbufRenderer *pr;
	gdouble zoom;
	gint width, height;

	pr = (PixbufRenderer *)imd->pr;

	if (!pixbuf_renderer_get_pixbuf(pr) ||
	    !pixbuf_renderer_get_image_size(pr, &width, &height)) return;

	if (vertical)
		{
		zoom = (gdouble)pr->window_height / height;
		}
	else
		{
		zoom = (gdouble)pr->window_width / width;
		}

	if (zoom < 1.0)
		{
		zoom = 0.0 - 1.0 / zoom;
		}

	pixbuf_renderer_zoom_set(pr, zoom);
}

gdouble image_zoom_get(ImageWindow *imd)
{
	return pixbuf_renderer_zoom_get((PixbufRenderer *)imd->pr);
}

gdouble image_zoom_get_real(ImageWindow *imd)
{
	return pixbuf_renderer_zoom_get_scale((PixbufRenderer *)imd->pr);
}

gchar *image_zoom_get_as_text(ImageWindow *imd)
{
	gdouble zoom;
	gdouble scale;
	gdouble l = 1.0;
	gdouble r = 1.0;
	gint pl = 0;
	gint pr = 0;
	gchar *approx = " ";

	zoom = image_zoom_get(imd);
	scale = image_zoom_get_real(imd);

	if (zoom > 0.0)
		{
		l = zoom;
		}
	else if (zoom < 0.0)
		{
		r = 0.0 - zoom;
		}
	else if (zoom == 0.0 && scale != 0.0)
		{
		if (scale >= 1.0)
			{
			l = scale;
			}
		else
			{
			r = 1.0 / scale;
			}
		approx = " ~";
		}

	if (rint(l) != l) pl = 1;
	if (rint(r) != r) pr = 1;

	return g_strdup_printf("%.*f :%s%.*f", pl, l, approx, pr, r);
}

gdouble image_zoom_get_default(ImageWindow *imd, gint mode)
{
	gdouble zoom;

	if (mode == ZOOM_RESET_ORIGINAL)
		{
		zoom = 1.0;
		}
	else if (mode == ZOOM_RESET_FIT_WINDOW)
		{
		zoom = 0.0;
		}
	else
		{
		if (imd)
			{
			zoom = image_zoom_get(imd);
			}
		else
			{
			zoom = 1.0;
			}
		}

	return zoom;
}

/* read ahead */

void image_prebuffer_set(ImageWindow *imd, const gchar *path)
{
	if (pixbuf_renderer_get_tiles((PixbufRenderer *)imd->pr)) return;

	if (path)
		{
		image_read_ahead_set(imd, path);
		}
	else
		{
		image_read_ahead_cancel(imd);
		}
}

static gint image_auto_refresh_cb(gpointer data)
{
	ImageWindow *imd = data;
	time_t newtime;
	
	if (!imd || !image_get_pixbuf(imd) ||
	    imd->il || !imd->image_path ||
	    !update_on_time_change) return TRUE;

	newtime = filetime(imd->image_path);
	if (newtime > 0 && newtime != imd->mtime)
		{
		imd->mtime = newtime;
		image_reload(imd);
		}

	return TRUE;
}

/* image auto refresh on time stamp change, in 1/1000's second, -1 disables */

void image_auto_refresh(ImageWindow *imd, gint interval)
{
	if (!imd) return;
	if (pixbuf_renderer_get_tiles((PixbufRenderer *)imd->pr)) return;

	if (imd->auto_refresh_id > -1)
		{
		g_source_remove(imd->auto_refresh_id);
		imd->auto_refresh_id = -1;
		imd->auto_refresh_interval = -1;
		}

	if (interval < 0) return;

	if (interval == 0) interval = IMAGE_AUTO_REFRESH_TIME;

	imd->auto_refresh_id = g_timeout_add((guint32)interval, image_auto_refresh_cb, imd);
	imd->auto_refresh_interval = interval;
}

void image_top_window_set_sync(ImageWindow *imd, gint allow_sync)
{
	imd->top_window_sync = allow_sync;

	g_object_set(G_OBJECT(imd->pr), "window_fit", allow_sync, NULL);
}

void image_background_set_black(ImageWindow *imd, gint black)
{
	pixbuf_renderer_set_black((PixbufRenderer *)imd->pr, black);
}

void image_background_set_color(ImageWindow *imd, GdkColor *color)
{
	pixbuf_renderer_set_color((PixbufRenderer *)imd->pr, color);
}

void image_set_delay_flip(ImageWindow *imd, gint delay)
{
	if (!imd ||
	    imd->delay_flip == delay) return;

	imd->delay_flip = delay;

	g_object_set(G_OBJECT(imd->pr), "delay_flip", delay, NULL);

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

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

		image_load_pixbuf_ready(imd);
		}
}

void image_to_root_window(ImageWindow *imd, gint scaled)
{
	GdkScreen *screen;
	GdkWindow *rootwindow;
	GdkPixmap *pixmap;
	GdkPixbuf *pixbuf;
	GdkPixbuf *pb;
	gint width, height;

	if (!imd) return;

	pixbuf = image_get_pixbuf(imd);
	if (!pixbuf) return;

	screen = gtk_widget_get_screen(imd->widget);
	rootwindow = gdk_screen_get_root_window(screen);
	if (gdk_drawable_get_visual(rootwindow) != gdk_visual_get_system()) return;

	if (scaled)
		{
		width = gdk_screen_width();
		height = gdk_screen_height();
		}
	else
		{
		pixbuf_renderer_get_scaled_size((PixbufRenderer *)imd->pr, &width, &height);
		}

	pb = gdk_pixbuf_scale_simple(pixbuf, width, height, (GdkInterpType)zoom_quality);

	gdk_pixbuf_render_pixmap_and_mask (pb, &pixmap, NULL, 128);
	gdk_window_set_back_pixmap(rootwindow, pixmap, FALSE);
	gdk_window_clear(rootwindow);
	g_object_unref(pb);
	g_object_unref(pixmap);

	gdk_flush();
}

/*
 *-------------------------------------------------------------------
 * prefs sync
 *-------------------------------------------------------------------
 */

static void image_options_set(ImageWindow *imd)
{
	g_object_set(G_OBJECT(imd->pr), "zoom_quality", zoom_quality,
					"zoom_2pass", two_pass_zoom,
					"zoom_expand", zoom_to_fit_expands,
					"dither_quality", dither_quality,
					"scroll_reset", scroll_reset_method,
					"cache_display", tile_cache_max,
					"window_fit", (imd->top_window_sync && fit_window),
					"window_limit", limit_window_size,
					"window_limit_value", max_window_size,
					NULL);

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

void image_options_sync(void)
{
	GList *work;

	work = image_list;
	while (work)
		{
		ImageWindow *imd;

		imd = work->data;
		work = work->next;

		image_options_set(imd);
		}
}

/*
 *-------------------------------------------------------------------
 * init / destroy
 *-------------------------------------------------------------------
 */

static void image_free(ImageWindow *imd)
{
	image_list = g_list_remove(image_list, imd);

	image_reset(imd);

	image_read_ahead_cancel(imd);
	image_post_buffer_set(imd, NULL, NULL);
	image_auto_refresh(imd, -1);

	g_free(imd->image_path);
	g_free(imd->title);
	g_free(imd->title_right);

	g_free(imd);
}

static void image_destroy_cb(GtkObject *widget, gpointer data)
{
	ImageWindow *imd = data;
	image_free(imd);
}

ImageWindow *image_new(gint frame)
{
	ImageWindow *imd;

	imd = g_new0(ImageWindow, 1);

	imd->top_window = NULL;
	imd->title = NULL;
	imd->title_right = NULL;
	imd->title_show_zoom = FALSE;

	imd->unknown = TRUE;

	imd->has_frame = frame;
	imd->top_window_sync = FALSE;

	imd->delay_alter_type = ALTER_NONE;

	imd->read_ahead_il = NULL;
	imd->read_ahead_pixbuf = NULL;
	imd->read_ahead_path = NULL;

	imd->completed = FALSE;

	imd->auto_refresh_id = -1;
	imd->auto_refresh_interval = -1;

	imd->delay_flip = FALSE;

	imd->func_update = NULL;
	imd->func_complete = NULL;
	imd->func_tile_request = NULL;
	imd->func_tile_dispose = NULL;

	imd->func_button = NULL;
	imd->func_scroll = NULL;

	imd->pr = GTK_WIDGET(pixbuf_renderer_new());

	image_options_set(imd);

	if (imd->has_frame)
		{
		imd->widget = gtk_frame_new(NULL);
		gtk_frame_set_shadow_type(GTK_FRAME(imd->widget), GTK_SHADOW_IN);
		gtk_container_add(GTK_CONTAINER(imd->widget), imd->pr);
		gtk_widget_show(imd->pr);

		GTK_WIDGET_SET_FLAGS(imd->widget, GTK_CAN_FOCUS);
		g_signal_connect(G_OBJECT(imd->widget), "focus_in_event",
				 G_CALLBACK(image_focus_in_cb), imd);
		g_signal_connect(G_OBJECT(imd->widget), "focus_out_event",
				 G_CALLBACK(image_focus_out_cb), imd);

		g_signal_connect_after(G_OBJECT(imd->widget), "expose_event",
				       G_CALLBACK(image_focus_expose), imd);
		}
	else
		{
		imd->widget = imd->pr;
		}

	g_signal_connect(G_OBJECT(imd->pr), "clicked",
			 G_CALLBACK(image_click_cb), imd);
	g_signal_connect(G_OBJECT(imd->pr), "scroll_notify",
			 G_CALLBACK(image_scroll_notify_cb), imd);

	g_signal_connect(G_OBJECT(imd->pr), "scroll_event",
			 G_CALLBACK(image_scroll_cb), imd);

	g_signal_connect(G_OBJECT(imd->pr), "destroy",
			 G_CALLBACK(image_destroy_cb), imd);

	g_signal_connect(G_OBJECT(imd->pr), "zoom",
			 G_CALLBACK(image_zoom_cb), imd);
	g_signal_connect(G_OBJECT(imd->pr), "render_complete",
			 G_CALLBACK(image_render_complete_cb), imd);

	image_list = g_list_append(image_list, imd);

	return imd;
}