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。

	while (work && pr->tile_cache_size + space > tile_max)
		{
		ImageTile *needle;

		needle = work->data;
		work = work->prev;
		if (needle != it &&
		    ((!needle->qd && !needle->qd2) || !pr_tile_is_visible(pr, needle))) pr_tile_remove(pr, needle);
		}
}

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

	work = pr->tiles;
	while (work)
		{
		ImageTile *it;

		it = work->data;
		work = work->next;

		it->render_done = TILE_RENDER_NONE;
		it->render_todo = TILE_RENDER_ALL;
		it->blank = FALSE;

		it->w = MIN(pr->tile_width, pr->width - it->x);
		it->h = MIN(pr->tile_height, pr->height - it->y);
		}
}

static void pr_tile_invalidate_region(PixbufRenderer *pr, gint x, gint y, gint w, gint h)
{
	gint x1, x2;
	gint y1, y2;
	GList *work;

	x1 = (gint)floor(x / pr->tile_width) * pr->tile_width;
	x2 = (gint)ceil((x + w) / pr->tile_width) * pr->tile_width;

	y1 = (gint)floor(y / pr->tile_height) * pr->tile_height;
	y2 = (gint)ceil((y + h) / pr->tile_height) * pr->tile_height;

	work = pr->tiles;
	while (work)
		{
		ImageTile *it;

		it = work->data;
		work = work->next;

		if (it->x < x2 && it->x + it->w > x1 &&
		    it->y < y2 && it->y + it->h > y1)
			{
			it->render_done = TILE_RENDER_NONE;
			it->render_todo = TILE_RENDER_ALL;
			}
		}
}

static ImageTile *pr_tile_get(PixbufRenderer *pr, gint x, gint y, gint only_existing)
{
	GList *work;

	work = pr->tiles;
	while (work)
		{
		ImageTile *it;

		it = work->data;
		if (it->x == x && it->y == y)
			{
			pr->tiles = g_list_delete_link(pr->tiles, work);
			pr->tiles = g_list_prepend(pr->tiles, it);
			return it;
			}

		work = work->next;
		}

	if (only_existing) return NULL;

	return pr_tile_add(pr, x, y);
}

static void pr_tile_prepare(PixbufRenderer *pr, ImageTile *it)
{
	if (!it->pixmap)
		{
		GdkPixmap *pixmap;
		guint size;

		pixmap = gdk_pixmap_new(((GtkWidget *)pr)->window, pr->tile_width, pr->tile_height, -1);

		size = pixmap_calc_size(pixmap);
		pr_tile_free_space(pr, size, it);

		it->pixmap = pixmap;
		it->size += size;
		pr->tile_cache_size += size;
		}
	
	if ((pr->zoom != 1.0 || pr->source_tiles_enabled || (pr->pixbuf && gdk_pixbuf_get_has_alpha(pr->pixbuf)) ) &&
	    !it->pixbuf)
		{
		GdkPixbuf *pixbuf;
		guint size;

		if (pr->pixbuf)
			{
			pixbuf = gdk_pixbuf_new(gdk_pixbuf_get_colorspace(pr->pixbuf),
						gdk_pixbuf_get_has_alpha(pr->pixbuf),
						gdk_pixbuf_get_bits_per_sample(pr->pixbuf),
						pr->tile_width, pr->tile_height);
			}
		else
			{
			pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, pr->tile_width, pr->tile_height);
			}

		size = gdk_pixbuf_get_rowstride(pixbuf) * pr->tile_height;
		pr_tile_free_space(pr, size, it);

		it->pixbuf = pixbuf;
		it->size += size;
		pr->tile_cache_size += size;
		}
}

/*
 *-------------------------------------------------------------------
 * drawing
 *-------------------------------------------------------------------
 */

static void pr_tile_render(PixbufRenderer *pr, ImageTile *it,
			   gint x, gint y, gint w, gint h,
			   gint new_data, gint fast)
{
	GtkWidget *box;
	gint has_alpha;
	gint draw = FALSE;

	if (it->render_todo == TILE_RENDER_NONE && it->pixmap && !new_data) return;

	if (it->render_done != TILE_RENDER_ALL)
		{
		x = 0;
		y = 0;
		w = it->w;
		h = it->h;
		if (!fast) it->render_done = TILE_RENDER_ALL;
		}
	else if (it->render_todo != TILE_RENDER_AREA)
		{
		if (!fast) it->render_todo = TILE_RENDER_NONE;
		return;
		}

	if (!fast) it->render_todo = TILE_RENDER_NONE;

	if (new_data) it->blank = FALSE;

	pr_tile_prepare(pr, it);
	has_alpha = (pr->pixbuf && gdk_pixbuf_get_has_alpha(pr->pixbuf));

	box = GTK_WIDGET(pr);

	/* FIXME checker colors for alpha should be configurable,
	 * also should be drawn for blank = TRUE
	 */

	if (it->blank)
		{
		/* no data, do fast rect fill */
		gdk_draw_rectangle(it->pixmap, box->style->black_gc, TRUE,
				   0, 0, it->w, it->h);
		}
	else if (pr->source_tiles_enabled)
		{
		draw = pr_source_tile_render(pr, it, x, y, w, h, new_data, fast);
		}
	else if (pr->zoom == 1.0 || pr->scale == 1.0)
		{
		if (has_alpha)
			{
			gdk_pixbuf_composite_color(pr->pixbuf, it->pixbuf, x, y, w, h,
					 (double) 0.0 - it->x,
					 (double) 0.0 - it->y,
					 1.0, 1.0, GDK_INTERP_NEAREST,
					 255, it->x + x, it->y + y,
					 PR_ALPHA_CHECK_SIZE, PR_ALPHA_CHECK1, PR_ALPHA_CHECK2);
			draw = TRUE;
			}
		else
			{
			/* faster, simple */
			gdk_draw_pixbuf(it->pixmap,
					box->style->fg_gc[GTK_WIDGET_STATE(box)],
					pr->pixbuf,
					it->x + x, it->y + y,
					x, y,
					w, h,
					pr->dither_quality, it->x + x, it->y + y);
			}
		}
	else
		{
		double scale_x, scale_y;

		if (pr->image_width == 0 || pr->image_height == 0) return;
		scale_x = (double)pr->width / pr->image_width;
		scale_y = (double)pr->height / pr->image_height;

		/* HACK: The pixbuf scalers get kinda buggy(crash) with extremely
		 * small sizes for anything but GDK_INTERP_NEAREST
		 */
		if (pr->width < PR_MIN_SCALE_SIZE || pr->height < PR_MIN_SCALE_SIZE) fast = TRUE;

		if (!has_alpha)
			{
			gdk_pixbuf_scale(pr->pixbuf, it->pixbuf, x, y, w, h,
					 (double) 0.0 - it->x,
					 (double) 0.0 - it->y,
					 scale_x, scale_y,
					 (fast) ? GDK_INTERP_NEAREST : pr->zoom_quality);
			}
		else
			{
			gdk_pixbuf_composite_color(pr->pixbuf, it->pixbuf, x, y, w, h,
					 (double) 0.0 - it->x,
					 (double) 0.0 - it->y,
					 scale_x, scale_y,
					 (fast) ? GDK_INTERP_NEAREST : pr->zoom_quality,
					 255, it->x + x, it->y + y,
					 PR_ALPHA_CHECK_SIZE, PR_ALPHA_CHECK1, PR_ALPHA_CHECK2);
			}
		draw = TRUE;
		}

	if (draw && it->pixbuf && !it->blank)
		{
		gdk_draw_pixbuf(it->pixmap,
				box->style->fg_gc[GTK_WIDGET_STATE(box)],
				it->pixbuf,
				x, y,
				x, y,
				w, h,
				pr->dither_quality, it->x + x, it->y + y);
		}
}


static void pr_tile_expose(PixbufRenderer *pr, ImageTile *it,
			   gint x, gint y, gint w, gint h,
			   gint new_data, gint fast)
{
	GtkWidget *box;

	pr_tile_render(pr, it, x, y, w, h, new_data, fast);

	box = GTK_WIDGET(pr);

	gdk_draw_drawable(box->window, box->style->fg_gc[GTK_WIDGET_STATE(box)],
			  it->pixmap, x, y,
			  pr->x_offset + (it->x - pr->x_scroll) + x, pr->y_offset + (it->y - pr->y_scroll) + y, w, h);

	if (pr->overlay_list)
		{
		pr_overlay_draw(pr, pr->x_offset + (it->x - pr->x_scroll) + x,
				pr->y_offset + (it->y - pr->y_scroll) + y,
				w, h);
		}
}


static gint pr_tile_is_visible(PixbufRenderer *pr, ImageTile *it)
{
	return (it->x + it->w >= pr->x_scroll && it->x < pr->x_scroll + pr->vis_width &&
		it->y + it->h >= pr->y_scroll && it->y < pr->y_scroll + pr->vis_height);
}

/*
 *-------------------------------------------------------------------
 * draw queue
 *-------------------------------------------------------------------
 */

static gint pr_queue_draw_idle_cb(gpointer data)
{
	PixbufRenderer *pr = data;
	QueueData *qd;
	gint fast;

	if ((!pr->pixbuf && !pr->source_tiles_enabled) ||
	    (!pr->draw_queue && !pr->draw_queue_2pass) ||
	    pr->draw_idle_id == -1)
		{
		pr_render_complete_signal(pr);

		pr->draw_idle_id = -1;
		return FALSE;
		}

	if (pr->draw_queue)
		{
		qd = pr->draw_queue->data;
		fast = (pr->zoom_2pass && pr->zoom_quality != GDK_INTERP_NEAREST && pr->scale != 1.0);
		}
	else
		{
		if (pr->loading)
			{
			/* still loading, wait till done (also drops the higher priority) */

			pr->draw_idle_id = g_idle_add_full(G_PRIORITY_DEFAULT_IDLE,
							   pr_queue_draw_idle_cb, pr, NULL);
			pr->draw_idle_high = FALSE;
			return FALSE;
			}

		qd = pr->draw_queue_2pass->data;
		fast = FALSE;
		}

	if (GTK_WIDGET_REALIZED(pr))
		{
		if (pr_tile_is_visible(pr, qd->it))
			{
			pr_tile_expose(pr, qd->it, qd->x, qd->y, qd->w, qd->h, qd->new_data, fast);
			}
		else if (qd->new_data)
			{
			/* if new pixel data, and we already have a pixmap, update the tile */
			qd->it->blank = FALSE;
			if (qd->it->pixmap && qd->it->render_done == TILE_RENDER_ALL)
				{
				pr_tile_render(pr, qd->it, qd->x, qd->y, qd->w, qd->h, qd->new_data, fast);
				}
			}
		}

	if (pr->draw_queue)
		{
		qd->it->qd = NULL;
		pr->draw_queue = g_list_remove(pr->draw_queue, qd);
		if (fast)
			{
			if (qd->it->qd2)
				{
				pr_queue_merge(qd->it->qd2, qd);
				g_free(qd);
				}
			else
				{
				qd->it->qd2 = qd;
				pr->draw_queue_2pass = g_list_append(pr->draw_queue_2pass, qd);
				}
			}
		else
			{
			g_free(qd);
			}
		}
	else
		{
		qd->it->qd2 = NULL;
		pr->draw_queue_2pass = g_list_remove(pr->draw_queue_2pass, qd);
		g_free(qd);
		}

	if (!pr->draw_queue && !pr->draw_queue_2pass)
		{
		pr_render_complete_signal(pr);

		pr->draw_idle_id = -1;
		return FALSE;
		}

	return TRUE;
}

static void pr_queue_list_free(GList *list)
{
	GList *work;

	work = list;
	while (work)
		{
		QueueData *qd;

		qd = work->data;
		work = work->next;

		qd->it->qd = NULL;
		qd->it->qd2 = NULL;
		g_free(qd);
		}

	g_list_free(list);
}

static void pr_queue_clear(PixbufRenderer *pr)
{
	pr_queue_list_free(pr->draw_queue);
	pr->draw_queue = NULL;

	pr_queue_list_free(pr->draw_queue_2pass);
	pr->draw_queue_2pass = NULL;

	if (pr->draw_idle_id != -1) g_source_remove(pr->draw_idle_id);
	pr->draw_idle_id = -1;
}

static void pr_queue_merge(QueueData *parent, QueueData *qd)
{
	if (parent->x + parent->w < qd->x + qd->w)
		{
		parent->w += (qd->x + qd->w) - (parent->x + parent->w);
		}
	if (parent->x > qd->x)
		{
		parent->w += parent->x - qd->x;
		parent->x = qd->x;
		}

	if (parent->y + parent->h < qd->y + qd->h)
		{
		parent->h += (qd->y + qd->h) - (parent->y + parent->h);
		}
	if (parent->y > qd->y)
		{
		parent->h += parent->y - qd->y;
		parent->y = qd->y;
		}

	parent->new_data |= qd->new_data;
}

static gint pr_clamp_to_visible(PixbufRenderer *pr, gint *x, gint *y, gint *w, gint *h)
{
	gint nx, ny;
	gint nw, nh;
	gint vx, vy;
	gint vw, vh;

	vw = pr->vis_width;
	vh = pr->vis_height;

	vx = pr->x_scroll;
	vy = pr->y_scroll;

	if (*x + *w < vx || *x > vx + vw || *y + *h < vy || *y > vy + vh) return FALSE;

	/* now clamp it */
	nx = CLAMP(*x, vx, vx + vw);
	nw = CLAMP(*w - (nx - *x), 1, vw);

	ny = CLAMP(*y, vy, vy + vh);
	nh = CLAMP(*h - (ny - *y), 1, vh);

	*x = nx;
	*y = ny;
	*w = nw;
	*h = nh;

	return TRUE;
}

static gint pr_queue_to_tiles(PixbufRenderer *pr, gint x, gint y, gint w, gint h,
			      gint clamp, ImageTileRenderType render, gint new_data, gint only_existing)
{
	gint i, j;
	gint x1, x2;
	gint y1, y2;

	if (clamp && !pr_clamp_to_visible(pr, &x, &y, &w, &h)) return FALSE;

	x1 = (gint)floor(x / pr->tile_width) * pr->tile_width;
	x2 = (gint)ceil((x + w) / pr->tile_width) * pr->tile_width;

	y1 = (gint)floor(y / pr->tile_height) * pr->tile_height;
	y2 = (gint)ceil((y + h) / pr->tile_height) * pr->tile_height;

	for (j = y1; j <= y2; j += pr->tile_height)
		{
		for (i = x1; i <= x2; i += pr->tile_width)
			{
			ImageTile *it;

			it = pr_tile_get(pr, i, j,
					 (only_existing &&
					  (i + pr->tile_width < pr->x_scroll ||
					   i > pr->x_scroll + pr->vis_width ||
					   j + pr->tile_height < pr->y_scroll ||
					   j > pr->y_scroll + pr->vis_height)));
			if (it)
				{
				QueueData *qd;

				if ((render == TILE_RENDER_ALL && it->render_done != TILE_RENDER_ALL) ||
				    (render == TILE_RENDER_AREA && it->render_todo != TILE_RENDER_ALL))
					{
					it->render_todo = render;
					}

				qd = g_new(QueueData, 1);
				qd->it = it;
				qd->new_data = new_data;

				if (i < x)
					{
					qd->x = x - i;
					}
				else
					{
					qd->x = 0;
					}
				qd->w = x + w - i - qd->x;
				if (qd->x + qd->w > pr->tile_width) qd->w = pr->tile_width - qd->x;

				if (j < y)
					{
					qd->y = y - j;
					}
				else
					{
					qd->y = 0;
					}
				qd->h = y + h - j - qd->y;
				if (qd->y + qd->h > pr->tile_height) qd->h = pr->tile_height - qd->y;

				if (qd->w < 1 || qd->h < 1)
					{
					g_free(qd);
					}
				else if (it->qd)
					{
					pr_queue_merge(it->qd, qd);
					g_free(qd);
					}
				else
					{
					it->qd = qd;
					pr->draw_queue = g_list_append(pr->draw_queue, qd);
					}
				}
			}
		}

	return TRUE;
}

static void pr_queue(PixbufRenderer *pr, gint x, gint y, gint w, gint h,
		     gint clamp, ImageTileRenderType render, gint new_data, gint only_existing)
{
	gint nx, ny;

	nx = CLAMP(x, 0, pr->width - 1);
	ny = CLAMP(y, 0, pr->height - 1);
	w -= (nx - x);
	h -= (ny - y);
	w = CLAMP(w, 0, pr->width - nx);
	h = CLAMP(h, 0, pr->height - ny);
	if (w < 1 || h < 1) return;

	if (pr_queue_to_tiles(pr, nx, ny, w, h, clamp, render, new_data, only_existing) &&
	    ((!pr->draw_queue && !pr->draw_queue_2pass) || pr->draw_idle_id == -1 || !pr->draw_idle_high))
		{
		if (pr->draw_idle_id != -1) g_source_remove(pr->draw_idle_id);
		pr->draw_idle_id = g_idle_add_full(GDK_PRIORITY_REDRAW,
						   pr_queue_draw_idle_cb, pr, NULL);
		pr->draw_idle_high = TRUE;
		}
}

static void pr_redraw(PixbufRenderer *pr, gint new_data)
{
	pr_queue_clear(pr);