pixbuf-renderer.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。

			g_value_set_boolean(value, pr->loading);
			break;
		case PROP_COMPLETE:
			g_value_set_boolean(value, pr->complete);
			break;
		case PROP_CACHE_SIZE_DISPLAY:
			g_value_set_uint(value, pr->tile_cache_max);
			break;
		case PROP_CACHE_SIZE_TILES:
			g_value_set_uint(value, pr->source_tiles_cache_size);
			break;
		case PROP_WINDOW_FIT:
			g_value_set_boolean(value, pr->window_fit);
			break;
		case PROP_WINDOW_LIMIT:
			g_value_set_boolean(value, pr->window_limit);
			break;
		case PROP_WINDOW_LIMIT_VALUE:
			g_value_set_uint(value, pr->window_limit_size);
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
			break;
		}
}

static gint pixbuf_renderer_expose(GtkWidget *widget, GdkEventExpose *event)
{
	if (GTK_WIDGET_DRAWABLE(widget))
		{
		if (!GTK_WIDGET_NO_WINDOW(widget))
			{
			pixbuf_renderer_paint(PIXBUF_RENDERER(widget), &event->area);
			}
		}

	return FALSE;
}

/*
 *-------------------------------------------------------------------
 * misc utilities
 *-------------------------------------------------------------------
 */

static void widget_set_cursor(GtkWidget *widget, gint icon)
{
	GdkCursor *cursor;

	if (!widget->window) return;

	if (icon == -1)
		{
		cursor = NULL;
		}
	else
		{
		cursor = gdk_cursor_new (icon);
		}

	gdk_window_set_cursor(widget->window, cursor);

	if (cursor) gdk_cursor_unref(cursor);
}

static gint pixmap_calc_size(GdkPixmap *pixmap)
{
	gint w, h, d;

	d = gdk_drawable_get_depth(pixmap);
	gdk_drawable_get_size(pixmap, &w, &h);
	return w * h * (d / 8);
}

static gint pr_clip_region(gint x, gint y, gint w, gint h,
			   gint clip_x, gint clip_y, gint clip_w, gint clip_h,
			   gint *rx, gint *ry, gint *rw, gint *rh)
{
	if (clip_x + clip_w <= x ||
	    clip_x >= x + w ||
	    clip_y + clip_h <= y ||
	    clip_y >= y + h)
		{
		return FALSE;
		}

	*rx = MAX(x, clip_x);
	*rw = MIN((x + w), (clip_x + clip_w)) - *rx;

	*ry = MAX(y, clip_y);
	*rh = MIN((y + h), (clip_y + clip_h)) - *ry;

	return TRUE;
}

static gint pr_parent_window_sizable(PixbufRenderer *pr)
{
	GdkWindowState state;

	if (!pr->parent_window) return FALSE;
	if (!pr->window_fit) return FALSE;
	if (!GTK_WIDGET(pr)->window) return FALSE;

	if (!pr->parent_window->window) return FALSE;
	state = gdk_window_get_state(pr->parent_window->window);
	if (state & GDK_WINDOW_STATE_MAXIMIZED) return FALSE;

	return TRUE;
}

static gint pr_parent_window_resize(PixbufRenderer *pr, gint w, gint h)
{
	GtkWidget *widget;
	GtkWidget *parent;
	gint ww, wh;

	if (!pr_parent_window_sizable(pr)) return FALSE;

	if (pr->window_limit)
		{
		gint sw = gdk_screen_width() * pr->window_limit_size / 100;
		gint sh = gdk_screen_height() * pr->window_limit_size / 100;

		if (w > sw) w = sw;
		if (h > sh) h = sh;
		}

	widget = GTK_WIDGET(pr);
	parent = GTK_WIDGET(pr->parent_window);

	w += (parent->allocation.width - widget->allocation.width);
	h += (parent->allocation.height - widget->allocation.height);

	gdk_drawable_get_size(parent->window, &ww, &wh);
	if (w == ww && h == wh) return FALSE;

	gdk_window_resize(parent->window, w, h);

	return TRUE;
}

void pixbuf_renderer_set_parent(PixbufRenderer *pr, GtkWindow *window)
{
	g_return_if_fail(IS_PIXBUF_RENDERER(pr));
	g_return_if_fail(window == NULL || GTK_IS_WINDOW(window));

	pr->parent_window = GTK_WIDGET(window);
}

GtkWindow *pixbuf_renderer_get_parent(PixbufRenderer *pr)
{
	g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), NULL);

	return GTK_WINDOW(pr->parent_window);
}


/*
 *-------------------------------------------------------------------
 * overlays
 *-------------------------------------------------------------------
 */

static void pr_overlay_draw(PixbufRenderer *pr, gint x, gint y, gint w, gint h)
{
	GtkWidget *box;
	GList *work;

	box = GTK_WIDGET(pr);

	work = pr->overlay_list;
	while (work)
		{
		OverlayData *od;
		gint px, py, pw, ph;
		gint rx, ry, rw, rh;

		od = work->data;
		work = work->next;

		if (!od->visible) continue;

		pw = gdk_pixbuf_get_width(od->pixbuf);
		ph = gdk_pixbuf_get_height(od->pixbuf);
		px = od->x;
		py = od->y;

	        if (od->relative)
			{
			if (px < 0) px = pr->window_width - pw + px;
			if (py < 0) py = pr->window_height - ph + py;
			}

		if (pr_clip_region(x, y, w, h, px, py, pw, ph, &rx, &ry, &rw, &rh))
			{
			gdk_draw_pixbuf(box->window,
					box->style->fg_gc[GTK_WIDGET_STATE(box)],
					od->pixbuf,
					rx - px, ry - py,
					rx, ry, rw, rh,
					pr->dither_quality, rx, ry);
			}
		}
}

static void pr_overlay_queue_draw(PixbufRenderer *pr, OverlayData *od, gint hidden)
{
	gint x, y, w, h;
	gint old_vis;

	w = gdk_pixbuf_get_width(od->pixbuf);
	h = gdk_pixbuf_get_height(od->pixbuf);
	x = od->x;
	y = od->y;

	if (od->relative)
		{
		if (x < 0) x = pr->window_width - w + x;
		if (y < 0) y = pr->window_height - h + y;
		}

	pr_queue(pr, pr->x_scroll - pr->x_offset + x,
		 pr->y_scroll - pr->y_offset + y,
		 w, h,
		 FALSE, TILE_RENDER_ALL, FALSE, FALSE);

	old_vis = od->visible;
	if (hidden) od->visible = FALSE;
	pr_border_draw(pr, x, y, w, h);
	od->visible = old_vis;
}

static void pr_overlay_queue_all(PixbufRenderer *pr)
{
	GList *work;

	work = pr->overlay_list;
	while (work)
		{
		OverlayData *od = work->data;
		work = work->next;

		pr_overlay_queue_draw(pr, od, FALSE);
		}
}

static OverlayData *pr_overlay_find(PixbufRenderer *pr, gint id)
{
	GList *work;

	work = pr->overlay_list;
	while (work)
		{
		OverlayData *od = work->data;
		work = work->next;

		if (od->id == id) return od;
		}

	return NULL;
}

gint pixbuf_renderer_overlay_add(PixbufRenderer *pr, GdkPixbuf *pixbuf, gint x, gint y,
		 		 gint relative, gint always)
{
	OverlayData *od;
	gint id;

	g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), -1);
	g_return_val_if_fail(pixbuf != NULL, -1);

	id = 1;
	while (pr_overlay_find(pr, id)) id++;

	od = g_new0(OverlayData, 1);
	od->id = id;
	od->pixbuf = pixbuf;
	g_object_ref(G_OBJECT(od->pixbuf));
	od->x = x;
	od->y = y;
	od->relative = relative;
	od->visible = TRUE;
	od->always = always;

	pr->overlay_list = g_list_append(pr->overlay_list, od);

	pr_overlay_queue_draw(pr, od, FALSE);

	return od->id;
}

static void pr_overlay_free(PixbufRenderer *pr, OverlayData *od)
{
	pr->overlay_list = g_list_remove(pr->overlay_list, od);

	if (od->pixbuf) g_object_unref(G_OBJECT(od->pixbuf));
	g_free(od);
}

static void pr_overlay_list_clear(PixbufRenderer *pr)
{
	while (pr->overlay_list)
		{
		OverlayData *od;

		od = pr->overlay_list->data;
		pr_overlay_free(pr, od);
		}
}

void pixbuf_renderer_overlay_set(PixbufRenderer *pr, gint id, GdkPixbuf *pixbuf, gint x, gint y)
{
	OverlayData *od;

	g_return_if_fail(IS_PIXBUF_RENDERER(pr));

	od = pr_overlay_find(pr, id);
	if (!od) return;

	if (pixbuf)
		{
		pr_overlay_queue_draw(pr, od, TRUE);

		g_object_ref(G_OBJECT(pixbuf));
		g_object_unref(G_OBJECT(od->pixbuf));
		od->pixbuf = pixbuf;

		od->x = x;
		od->y = y;

		pr_overlay_queue_draw(pr, od, FALSE);
		}
	else
		{
		pr_overlay_queue_draw(pr, od, TRUE);
		pr_overlay_free(pr, od);
		}
}

gint pixbuf_renderer_overlay_get(PixbufRenderer *pr, gint id, GdkPixbuf **pixbuf, gint *x, gint *y)
{
	OverlayData *od;

	g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);

	od = pr_overlay_find(pr, id);
	if (!od) return FALSE;

	if (pixbuf) *pixbuf = od->pixbuf;
	if (x) *x = od->x;
	if (y) *y = od->y;

	return TRUE;
}

void pixbuf_renderer_overlay_remove(PixbufRenderer *pr, gint id)
{
	pixbuf_renderer_overlay_set(pr, id, NULL, 0, 0);
}

/*
 *-------------------------------------------------------------------
 * scroller overlay
 *-------------------------------------------------------------------
 */


static gboolean pr_scroller_update_cb(gpointer data)
{
	PixbufRenderer *pr = data;
	gint x, y;
	gint xinc, yinc;

	/* this was a simple scroll by difference between scroller and mouse position,
	 * but all this math results in a smoother result and accounts for a dead zone.
	 */

	if (abs(pr->scroller_xpos - pr->scroller_x) < PR_SCROLLER_DEAD_ZONE)
		{
		x = 0;
		}
	else
		{
		gint shift = PR_SCROLLER_DEAD_ZONE / 2 * PR_SCROLLER_UPDATES_PER_SEC;
		x = (pr->scroller_xpos - pr->scroller_x) / 2 * PR_SCROLLER_UPDATES_PER_SEC;
		x += (x > 0) ? -shift : shift;
		}

	if (abs(pr->scroller_ypos - pr->scroller_y) < PR_SCROLLER_DEAD_ZONE)
		{
		y = 0;
		}
	else
		{
		gint shift = PR_SCROLLER_DEAD_ZONE / 2 * PR_SCROLLER_UPDATES_PER_SEC;
		y = (pr->scroller_ypos - pr->scroller_y) / 2 * PR_SCROLLER_UPDATES_PER_SEC;
		y += (y > 0) ? -shift : shift;
		}

	if (abs(x) < PR_SCROLLER_DEAD_ZONE * PR_SCROLLER_UPDATES_PER_SEC)
		{
		xinc = x;
		}
	else
		{
		xinc = pr->scroller_xinc;

		if (x >= 0)
			{
			if (xinc < 0) xinc = 0;
			if (x < xinc) xinc = x;
			if (x > xinc) xinc = MIN(xinc + x / PR_SCROLLER_UPDATES_PER_SEC, x);
			}
		else
			{
			if (xinc > 0) xinc = 0;
			if (x > xinc) xinc = x;
			if (x < xinc) xinc = MAX(xinc + x / PR_SCROLLER_UPDATES_PER_SEC, x);
			}
		}

	if (abs(y) < PR_SCROLLER_DEAD_ZONE * PR_SCROLLER_UPDATES_PER_SEC)
		{
		yinc = y;
		}
	else
		{
		yinc = pr->scroller_yinc;

		if (y >= 0)
			{
			if (yinc < 0) yinc = 0;
			if (y < yinc) yinc = y;
			if (y > yinc) yinc = MIN(yinc + y / PR_SCROLLER_UPDATES_PER_SEC, y);
			}
		else
			{
			if (yinc > 0) yinc = 0;
			if (y > yinc) yinc = y;
			if (y < yinc) yinc = MAX(yinc + y / PR_SCROLLER_UPDATES_PER_SEC, y);
			}
		}

	pr->scroller_xinc = xinc;
	pr->scroller_yinc = yinc;

	xinc = xinc / PR_SCROLLER_UPDATES_PER_SEC;
	yinc = yinc / PR_SCROLLER_UPDATES_PER_SEC;

	pixbuf_renderer_scroll(pr, xinc, yinc);

	return TRUE;
}

static void pr_scroller_timer_set(PixbufRenderer *pr, gint start)
{
	if (pr->scroller_id != -1)
		{
		g_source_remove(pr->scroller_id);
		pr->scroller_id = -1;
		}

	if (start)
		{
		pr->scroller_id = g_timeout_add(1000 / PR_SCROLLER_UPDATES_PER_SEC,
						pr_scroller_update_cb, pr);
		}
}

static void pr_scroller_start(PixbufRenderer *pr, gint x, gint y)
{
	if (pr->scroller_overlay == -1)
		{
		GdkPixbuf *pixbuf;
		gint w, h;

#ifdef GQVIEW_BUILD
		pixbuf = pixbuf_inline(PIXBUF_INLINE_SCROLLER);
#else
		pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, 32, 32);
		gdk_pixbuf_fill(pixbuf, 0x000000ff);
#endif
		w = gdk_pixbuf_get_width(pixbuf);
		h = gdk_pixbuf_get_height(pixbuf);

		pr->scroller_overlay = pixbuf_renderer_overlay_add(pr, pixbuf, x - w / 2, y - h / 2, FALSE, TRUE);
		g_object_unref(pixbuf);
		}

	pr->scroller_x = x;
	pr->scroller_y = y;
	pr->scroller_xpos = x;
	pr->scroller_ypos = y;

	pr_scroller_timer_set(pr, TRUE);
}

static void pr_scroller_stop(PixbufRenderer *pr)
{
	if (pr->scroller_id == -1) return;

	pixbuf_renderer_overlay_remove(pr, pr->scroller_overlay);
	pr->scroller_overlay = -1;

	pr_scroller_timer_set(pr, FALSE);
}

/*
 *-------------------------------------------------------------------
 * borders
 *-------------------------------------------------------------------
 */

static void pr_border_draw(PixbufRenderer *pr, gint x, gint y, gint w, gint h)
{
	GtkWidget *box;
	gint rx, ry, rw, rh;

	box = GTK_WIDGET(pr);

	if (!box->window) return;

	if (!pr->pixbuf && !pr->source_tiles_enabled)
		{
		if (pr_clip_region(x, y, w, h,
				   0, 0,
				   pr->window_width, pr->window_height,
				   &rx, &ry, &rw, &rh))
			{
			gdk_window_clear_area(box->window, rx, ry, rw, rh);
			pr_overlay_draw(pr, rx, ry, rw, rh);
			}
		return;
		}

	if (pr->vis_width < pr->window_width)
		{
		if (pr->x_offset > 0 &&
		    pr_clip_region(x, y, w, h,
				   0, 0,
				   pr->x_offset, pr->window_height,
				   &rx, &ry, &rw, &rh))
			{
			gdk_window_clear_area(box->window, rx, ry, rw, rh);
			pr_overlay_draw(pr, rx, ry, rw, rh);
			}
		if (pr->window_width - pr->vis_width - pr->x_offset > 0 &&
		    pr_clip_region(x, y, w, h,
				   pr->x_offset + pr->vis_width, 0,
				   pr->window_width - pr->vis_width - pr->x_offset, pr->window_height,
				   &rx, &ry, &rw, &rh))
			{
			gdk_window_clear_area(box->window, rx, ry, rw, rh);
			pr_overlay_draw(pr, rx, ry, rw, rh);
			}
		}
	if (pr->vis_height < pr->window_height)
		{
		if (pr->y_offset > 0 &&
		    pr_clip_region(x, y, w, h,
				   pr->x_offset, 0,
				   pr->vis_width, pr->y_offset,
				   &rx, &ry, &rw, &rh))
			{
			gdk_window_clear_area(box->window, rx, ry, rw, rh);
			pr_overlay_draw(pr, rx, ry, rw, rh);
			}
		if (pr->window_height - pr->vis_height - pr->y_offset > 0 &&
		    pr_clip_region(x, y, w, h,
				   pr->x_offset, pr->y_offset + pr->vis_height,
				   pr->vis_width, pr->window_height - pr->vis_height - pr->y_offset,
				   &rx, &ry, &rw, &rh))
			{
			gdk_window_clear_area(box->window, rx, ry, rw, rh);
			pr_overlay_draw(pr, rx, ry, rw, rh);
			}
		}
}

static void pr_border_clear(PixbufRenderer *pr)
{