print.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。

}

static gboolean print_window_layout_render_idle(gpointer data)
{
	PrintWindow *pw = data;

	print_job_close(pw, FALSE);
	print_job_start(pw, RENDER_FORMAT_PREVIEW, 0);

	pw->layout_idle_id = -1;
	return FALSE;
}

static void print_window_layout_render(PrintWindow *pw)
{
	gdouble proof_w, proof_h;

	print_proof_size(pw, &proof_w, &proof_h);
	pw->proof_columns = (pw->layout_width - pw->margin_left - pw->margin_right) / proof_w;
	pw->proof_rows = (pw->layout_height - pw->margin_top - pw->margin_bottom) / proof_h;

	print_window_layout_status(pw);

	if (pw->layout_idle_id == -1)
		{
		pw->layout_idle_id = g_idle_add(print_window_layout_render_idle, pw);
		}
}

static void print_window_layout_size(PrintWindow *pw)
{
	GdkPixbuf *pixbuf;
	gdouble width;
	gdouble height;
	gint sw, sh;

	if (!pw->layout_image) return;

	if (pw->paper_orientation == PAPER_ORIENTATION_LANDSCAPE)
		{
		width = pw->paper_height;
		height = pw->paper_width;
		}
	else
		{
		width = pw->paper_width;
		height = pw->paper_height;
		}

	pw->layout_width = width;
	pw->layout_height = height;

	sw = print_preview_unit(width);
	sh = print_preview_unit(height);
	pixbuf = image_get_pixbuf(pw->layout_image);
	if (!pixbuf ||
	    gdk_pixbuf_get_width(pixbuf) != sw ||
	    gdk_pixbuf_get_height(pixbuf) != sh)
		{
		pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, sw, sh);
		image_change_pixbuf(pw->layout_image, pixbuf, 0.0);
		g_object_unref(pixbuf);
		}

	print_window_layout_render(pw);
	print_window_layout_status(pw);
}

static gint print_layout_page_count(PrintWindow *pw)
{
	gint images;
	gint images_per_page;
	gint pages;

	if (pw->layout_width - pw->margin_left - pw->margin_right <= 0.0 ||
	    pw->layout_height - pw->margin_top - pw->margin_bottom <= 0.0)
		{
		return 0;
		}

	switch (pw->source)
		{
		case PRINT_SOURCE_ALL:
			images = g_list_length(pw->source_list);
			break;
		case PRINT_SOURCE_SELECTION:
			images = g_list_length(pw->source_selection);
			break;
		case PRINT_SOURCE_IMAGE:
		default:
			images = (pw->source_path) ? 1 : 0;
			break;
		}

	switch (pw->layout)
		{
		case PRINT_LAYOUT_PROOF:
			images_per_page = pw->proof_columns * pw->proof_rows;
			break;
		case PRINT_LAYOUT_IMAGE:
		default:
			images_per_page = 1;
			break;
		}

	if (images < 1 || images_per_page < 1) return 0;

	pages = images / images_per_page;
	if (pages * images_per_page < images) pages++;

	return pages;
}

static void print_layout_page_step(PrintWindow *pw, gint step)
{
	gint max;
	gint page;

	max = print_layout_page_count(pw);
	page = pw->proof_page + step;

	if (page >= max) page = max - 1;
	if (page < 0) page = 0;

	if (page == pw->proof_page) return;

	pw->proof_page = page;
	print_window_layout_size(pw);
}

static void print_layout_page_back_cb(GtkWidget *widget, gpointer data)
{
	PrintWindow *pw = data;

	print_layout_page_step(pw, -1);
}

static void print_layout_page_next_cb(GtkWidget *widget, gpointer data)
{
	PrintWindow *pw = data;

	print_layout_page_step(pw, 1);
}

static void print_layout_zoom_in_cb(GtkWidget *widget, gpointer data)
{
	PrintWindow *pw = data;
	image_zoom_adjust(pw->layout_image, 0.25);
}

static void print_layout_zoom_out_cb(GtkWidget *widget, gpointer data)
{
	PrintWindow *pw = data;
	image_zoom_adjust(pw->layout_image, -0.25);
}

static void print_layout_zoom_original_cb(GtkWidget *widget, gpointer data)
{
	PrintWindow *pw = data;
	gdouble zoom;

	zoom = image_zoom_get(pw->layout_image);
	image_zoom_set(pw->layout_image, (zoom == 1.0) ? 0.0 : 1.0);
}

static GtkWidget *print_window_layout_setup(PrintWindow *pw, GtkWidget *box)
{
	GtkWidget *vbox;
	GtkWidget *hbox;
	GtkWidget *group;
	GtkWidget *button;

	vbox = pref_box_new(box, TRUE, GTK_ORIENTATION_VERTICAL, PREF_PAD_GAP);
	group = pref_frame_new(vbox, TRUE, _("Preview"), GTK_ORIENTATION_VERTICAL, PREF_PAD_GAP);

	pw->layout_idle_id = -1;

	pw->layout_image = image_new(FALSE);
	gtk_widget_set_size_request(pw->layout_image->widget, PRINT_DLG_PREVIEW_WIDTH, PRINT_DLG_PREVIEW_HEIGHT);

	gtk_box_pack_start(GTK_BOX(group), pw->layout_image->widget, TRUE, TRUE, 0);
	gtk_widget_show(pw->layout_image->widget);

	hbox = pref_box_new(group, FALSE, GTK_ORIENTATION_HORIZONTAL, PREF_PAD_GAP);
	pw->button_back = pref_button_new(hbox, GTK_STOCK_GO_BACK, NULL, TRUE,
					  G_CALLBACK(print_layout_page_back_cb), pw);
	pw->button_next = pref_button_new(hbox, GTK_STOCK_GO_FORWARD, NULL, TRUE,
					  G_CALLBACK(print_layout_page_next_cb), pw);
	pw->page_label = pref_label_new(hbox, "");

	button = pref_button_new(NULL, GTK_STOCK_ZOOM_OUT, NULL, TRUE,
				 G_CALLBACK(print_layout_zoom_out_cb), pw);
	gtk_box_pack_end(GTK_BOX(hbox), button, FALSE, FALSE, 0);
	gtk_widget_show(button);
	button = pref_button_new(NULL, GTK_STOCK_ZOOM_IN, NULL, TRUE,
				 G_CALLBACK(print_layout_zoom_in_cb), pw);
	gtk_box_pack_end(GTK_BOX(hbox), button, FALSE, FALSE, 0);
	gtk_widget_show(button);
	button = pref_button_new(NULL, GTK_STOCK_ZOOM_100, NULL, TRUE,
				 G_CALLBACK(print_layout_zoom_original_cb), pw);
	gtk_box_pack_end(GTK_BOX(hbox), button, FALSE, FALSE, 0);
	gtk_widget_show(button);

	print_window_layout_size(pw);

	return vbox;
}

static void print_window_spin_set(GtkSpinButton *spin, gpointer block_data,
				  gdouble value, gdouble min, gdouble max,
				  gdouble step, gdouble page, gint digits)
{
	if (block_data) g_signal_handlers_block_matched(G_OBJECT(spin), G_SIGNAL_MATCH_DATA,
							0, 0, NULL, NULL, block_data);
	gtk_spin_button_set_digits(spin, digits);
	gtk_spin_button_set_increments(spin, step, page);
	gtk_spin_button_set_range(spin, min, max);
	gtk_spin_button_set_value(spin, value);

	if (block_data) g_signal_handlers_unblock_matched(G_OBJECT(spin), G_SIGNAL_MATCH_DATA,
							  0, 0, NULL, NULL, block_data);
}

static void print_window_layout_sync_layout(PrintWindow *pw)
{
	gtk_widget_set_sensitive(pw->image_scale_spin, (pw->layout == PRINT_LAYOUT_IMAGE));
	gtk_widget_set_sensitive(pw->proof_group, (pw->layout == PRINT_LAYOUT_PROOF));
}

static void print_window_layout_sync_paper(PrintWindow *pw)
{
	gdouble width, height;
	gint digits;
	gdouble step;
	gdouble page;

	gtk_widget_set_sensitive(pw->paper_width_spin, (pw->paper_size == 0));
	gtk_widget_set_sensitive(pw->paper_height_spin, (pw->paper_size == 0));

	width = print_paper_size_convert_units((gdouble)pw->paper_width, PAPER_UNIT_POINTS, pw->paper_units);
	height = print_paper_size_convert_units((gdouble)pw->paper_height, PAPER_UNIT_POINTS, pw->paper_units);

	switch (pw->paper_units)
		{
		case PAPER_UNIT_MM:
			digits = 1;
			step = 1.0;
			page = 10.0;
			break;
		case PAPER_UNIT_CM:
			digits = 2;
			step = 0.5;
			page = 1.0;
			break;
		case PAPER_UNIT_INCH:
			digits = 3;
			step = 0.25;
			page = 1.0;
			break;
		case PAPER_UNIT_PICAS:
			digits = 2;
			step = 1.0;
			page = 6.0;
			break;
		case PAPER_UNIT_POINTS:
		default:
			digits = 1;
			step = 1.0;
			page = 10.0;
			break;
		}

	print_window_spin_set(GTK_SPIN_BUTTON(pw->paper_width_spin), pw, width,
			      print_paper_size_convert_units(PRINT_MIN_WIDTH, PAPER_UNIT_POINTS, pw->paper_units),
			      print_paper_size_convert_units(PRINT_MAX_WIDTH, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);

	print_window_spin_set(GTK_SPIN_BUTTON(pw->paper_height_spin), pw, height,
			      print_paper_size_convert_units(PRINT_MIN_HEIGHT, PAPER_UNIT_POINTS, pw->paper_units),
			      print_paper_size_convert_units(PRINT_MAX_HEIGHT, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);

	print_window_spin_set(GTK_SPIN_BUTTON(pw->margin_left_spin), pw,
			      print_paper_size_convert_units(pw->margin_left, PAPER_UNIT_POINTS, pw->paper_units),
			      0.0,
			      print_paper_size_convert_units(PRINT_MAX_WIDTH, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);

	print_window_spin_set(GTK_SPIN_BUTTON(pw->margin_right_spin), pw,
			      print_paper_size_convert_units(pw->margin_right, PAPER_UNIT_POINTS, pw->paper_units),
			      0.0,
			      print_paper_size_convert_units(PRINT_MAX_WIDTH, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);

	print_window_spin_set(GTK_SPIN_BUTTON(pw->margin_top_spin), pw,
			      print_paper_size_convert_units(pw->margin_top, PAPER_UNIT_POINTS, pw->paper_units),
			      0.0,
			      print_paper_size_convert_units(PRINT_MAX_HEIGHT, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);

	print_window_spin_set(GTK_SPIN_BUTTON(pw->margin_bottom_spin), pw,
			      print_paper_size_convert_units(pw->margin_bottom, PAPER_UNIT_POINTS, pw->paper_units),
			      0.0,
			      print_paper_size_convert_units(PRINT_MAX_HEIGHT, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);

	print_window_spin_set(GTK_SPIN_BUTTON(pw->proof_width_spin), pw,
			      print_paper_size_convert_units(pw->proof_width, PAPER_UNIT_POINTS, pw->paper_units),
			      print_paper_size_convert_units(PRINT_PROOF_MIN_SIZE, PAPER_UNIT_POINTS, pw->paper_units),
			      print_paper_size_convert_units(PRINT_PROOF_MAX_SIZE, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);

	print_window_spin_set(GTK_SPIN_BUTTON(pw->proof_height_spin), pw,
			      print_paper_size_convert_units(pw->proof_height, PAPER_UNIT_POINTS, pw->paper_units),
			      print_paper_size_convert_units(PRINT_PROOF_MIN_SIZE, PAPER_UNIT_POINTS, pw->paper_units),
			      print_paper_size_convert_units(PRINT_PROOF_MAX_SIZE, PAPER_UNIT_POINTS, pw->paper_units),
			      step, page, digits);
}

static void print_window_layout_set_size(PrintWindow *pw, gdouble width, gdouble height)
{
	pw->paper_width = width;
	pw->paper_height = height;

	print_window_layout_sync_paper(pw);

	print_window_layout_size(pw);
}

static void print_window_layout_set_orientation(PrintWindow *pw, PaperOrientation o)
{
	if (pw->paper_orientation == o) return;

	pw->paper_orientation = o;

	print_window_layout_size(pw);
}

/*
 *-----------------------------------------------------------------------------
 * list printers
 *-----------------------------------------------------------------------------
 */

static GList *print_window_list_printers(void)
{
	FILE *p;
	GList *list = NULL;
	gchar buffer[2048];

	p = popen(PRINT_LPR_QUERY, "r");
	if (!p) return NULL;

	while (fgets(buffer, sizeof(buffer), p) != NULL)
		{
		gchar *ptr;
		gchar *end;

		ptr = buffer;
		if (strncmp(ptr, "printer ", 8) != 0) continue;
		if (strstr(ptr, "enabled") == NULL) continue;
		ptr += 8;
		end = ptr;
		while (*end != '\0' && *end != '\n' && *end != ' ' && *end != '\t') end++;
		*end = '\0';
		list = g_list_append(list, g_strdup(ptr));
		if (debug) printf("adding printer: %s\n", ptr);
		}

	pclose(p);

	return list;
}

/*
 *-----------------------------------------------------------------------------
 * print ps
 *-----------------------------------------------------------------------------
 */

typedef struct _PipeError PipeError;
struct _PipeError {
	struct sigaction old_action;
	sig_atomic_t *error;
};

static sig_atomic_t pipe_handler_error = FALSE;
static PipeError *pipe_handler_data = NULL;

static void pipe_handler_sigpipe_cb(int fd)
{
	pipe_handler_error = TRUE;
}

static PipeError *pipe_handler_new(void)
{
	struct sigaction new_action;
	PipeError *pe;

	if (pipe_handler_data)
		{
		printf("warning SIGPIPE handler already in use\n");
		return NULL;
		}

	pe = g_new0(PipeError, 1);

	pipe_handler_error = FALSE;
	pe->error = &pipe_handler_error;

	new_action.sa_handler = pipe_handler_sigpipe_cb;
	sigemptyset (&new_action.sa_mask);
	new_action.sa_flags = 0;

	/* setup our signal handler */
	sigaction (SIGPIPE, &new_action, &pe->old_action);

	pipe_handler_data = pe;
	return pe;
}

static void pipe_handler_free(PipeError *pe)
{
	if (!pe) return;
	if (pe != pipe_handler_data) printf("warning SIGPIPE handler not closing same data\n");

	/* restore the original signal handler */
	sigaction (SIGPIPE, &pe->old_action, NULL);

	pipe_handler_data = NULL;
	g_free(pe);
}

static gint pipe_handler_check(PipeError *pe)
{
	if (!pe) return FALSE;
	return *pe->error;
}

static FILE *print_job_ps_fd(PrintWindow *pw)
{
	if (pw->job_file) return pw->job_file;
	if (pw->job_pipe) return pw->job_pipe;
	return NULL;
}

static gint print_job_ps_init(PrintWindow *pw)
{
	FILE *f;
	PipeError *pe;
	const gchar *cmd = NULL;
	const gchar *path = NULL;
	gchar *lc_pointer;
	gint ret;

	if (pw->job_file != NULL || pw->job_pipe != NULL) return FALSE;

	switch (pw->job_output)
		{
		case PRINT_OUTPUT_PS_LPR:
			cmd = PRINT_LPR_COMMAND;
			break;
		case PRINT_OUTPUT_PS_CUSTOM:
			cmd = pw->output_custom;
			break;
		case PRINT_OUTPUT_PS_FILE:
			path = pw->output_path;
			break;
		default:
			return FALSE;
			break;
		}

	if (cmd)
		{
		pw->job_pipe = popen(cmd, "w");

		if (!pw->job_pipe)
			{
			gchar *buf;

			buf = g_strdup_printf(_("Unable to open pipe for writing.\n\"%s\""), cmd);
			print_job_throw_error(pw, buf);
			g_free(buf);

			return FALSE;
			}
		}
	else if (path)
		{
		gchar *pathl;

		if (isfile(path))
			{
			gchar *buf;

			buf = g_strdup_printf(_("A file with name %s already exists."), path);
			print_job_throw_error(pw, buf);
			g_free(buf);

			return FALSE;
			}

		pathl = path_from_utf8(path);
		pw->job_file = fopen(pathl, "w");
		g_free(pathl);

		if (!pw->job_file)
			{
			gchar *buf;

			buf = g_strdup_printf(_("Failure writing to file %s"), path);
			print_job_throw_error(pw, buf);
			g_free(buf);

			return FALSE;
			}

		g_free(pw->job_path);
		pw->job_path = g_strdup(path);
		}

	f = print_job_ps_fd(pw);
	if (!f) return FALSE;

	lc_pointer = g_strdup(setlocale(LC_NUMERIC, NULL));
	setlocale(LC_NUMERIC, POSTSCRIPT_LOCALE);

	pe = pipe_handler_new();

	/* comments, etc. */
	fprintf(f, "%%!PS-Adobe-3.0\n");
	fprintf(f, "%%%%Creator: GQview Version %s\n", VERSION);
	fprintf(f, "%%%%CreationDate: \n");
	fprintf(f, "%%%%LanguageLevel 2\n");
	fprintf(f, "%%%%DocumentMedia: \n");
	fprintf(f, "%%%%Orientation: %s\n",
		(pw->paper_orientation == PAPER_ORIENTATION_PORTRAIT) ? "Portrait" : "Landscape");
	fprintf(f, "%%%%BoundingBox: %f %f %f %f\n",
		0.0, 0.0, pw->paper_width, pw->paper_height);
	fprintf(f, "%%%%Pages: %d\n", print_layout_page_count(pw));
	fprintf(f, "%%%%PageOrder: Ascend\n");
	fprintf(f, "%%%%Title:\n");

	/* setup page size, coordinates (do we really need this?) */
#if 0
	fprintf(f, "<<\n");
	fprintf(f, "/PageSize [%f %f]\n", pw->layout_width, pw->layout_height);
	fprintf(f, "/ImagingBBox [%f %f %f %f]\n", /* l b r t */
		pw->margin_left, pw->margin_bottom,
		pw->layout_width - pw->margin_right, pw->layout_height - pw->margin_top);
	fprintf(f, "/Orientation %d\n",
		(pw->paper_orientation == PAPER_ORIENTATION_PORTRAIT) ? 0 : 1);
	fprintf(f, ">> setpagedevice\n");
#endif

	ret = !pipe_handler_check(pe);
	pipe_handler_free(pe);

	if (lc_pointer)
		{
		setlocale(LC_NUMERIC, lc_pointer);