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。

			     255, 255, 255, 255);

	/* draw cm or inch grid */
	if (TRUE)
		{
		gdouble i;
		gdouble grid;
		PaperUnits units;

		units = (pw->paper_units == PAPER_UNIT_MM ||
			 pw->paper_units == PAPER_UNIT_CM) ? PAPER_UNIT_CM : PAPER_UNIT_INCH;

		grid = print_paper_size_convert_units(1.0, units, PAPER_UNIT_POINTS);
		for (i = grid ; i < pw->layout_width; i += grid)
			{
			pixbuf_draw_rect_fill(pixbuf, print_preview_unit(i), 0, 1, h, 0, 0, 0, 16);
			}
		for (i = grid; i < pw->layout_height; i += grid)
			{
			pixbuf_draw_rect_fill(pixbuf, 0, print_preview_unit(i), w, 1, 0, 0, 0, 16);
			}
		}

	/* proof sheet grid */
	if (pw->layout == PRINT_LAYOUT_PROOF)
		{
		gdouble i, j;
		gdouble proof_w, proof_h;
		gint uw, uh;

		print_proof_size(pw, &proof_w, &proof_h);
		uw = print_preview_unit(proof_w + PRINT_PREVIEW_SCALE - 0.1);
		uh = print_preview_unit(proof_h + PRINT_PREVIEW_SCALE - 0.1);

		for (i = 0; i < pw->proof_columns; i++)
		    for (j = 0; j < pw->proof_rows; j++)
			{
			gint x, y;

			x = pw->margin_left + (pw->layout_width - pw->margin_left - pw->margin_right - (pw->proof_columns * proof_w)) / 2 + i * proof_w;
			y = pw->margin_top + j * proof_h;

			pixbuf_draw_rect(pixbuf, print_preview_unit(x), print_preview_unit(y), uw, uh,
					 255, 0, 0, 64, 1, 1, 1, 1);
			}
		}

	/* non-printable region (margins) */
	pixbuf_draw_rect(pixbuf, 0, 0, w, h,
			 0, 0, 0, 16,
			 l, r, t, b);

	/* margin lines */
	pixbuf_draw_rect(pixbuf, l, 0, w - l - r, h,
			 0, 0, 255, 128,
			 1, 1, 0, 0);
	pixbuf_draw_rect(pixbuf, 0, t, w, h - t - b,
			 0, 0, 255, 128,
			 0, 0, 1, 1);

	/* border */
	pixbuf_draw_rect(pixbuf, 0, 0, w, h,
			 0, 0, 0, 255,
			 1, 1, 1, 1);

	image_area_changed(pw->layout_image, 0, 0, w, h);

	return TRUE;
}

static gint print_job_preview_page_done(PrintWindow *pw)
{
	return TRUE;
}

static gint print_job_preview_page_image(PrintWindow *pw, GdkPixbuf *pixbuf,
				         gdouble x, gdouble y, gdouble w, gdouble h,
				         gdouble offx, gdouble offy)
{
	gdouble sw, sh;
	gdouble dw, dh;
	gdouble rx, ry, rw, rh;

	if (!pw->job_pixbuf) return FALSE;
	if (!pixbuf) return TRUE;

	sw = (gdouble)gdk_pixbuf_get_width(pixbuf);
	sh = (gdouble)gdk_pixbuf_get_height(pixbuf);

	dw = (gdouble)gdk_pixbuf_get_width(pw->job_pixbuf);
	dh = (gdouble)gdk_pixbuf_get_height(pw->job_pixbuf);

	x = print_preview_unit(x);
	y = print_preview_unit(y);
	w = print_preview_unit(w);
	h = print_preview_unit(h);
	offx = print_preview_unit(offx);
	offy = print_preview_unit(offy);

	if (clip_region(x, y, w, h,
			0.0, 0.0, dw, dh,
			&rx, &ry, &rw, &rh))
		{
		gdk_pixbuf_composite(pixbuf, pw->job_pixbuf, rx, ry, rw, rh,
				     x + offx, y + offy,
				     w / sw, h / sh,
				     (w / sw < 0.01 || h / sh < 0.01) ? GDK_INTERP_NEAREST : GDK_INTERP_BILINEAR, 255);

		image_area_changed(pw->layout_image, rx, ry, rw, rh);
		}

	return TRUE;
}

static gint print_job_preview_page_text(PrintWindow *pw, const gchar *text, gdouble point_size,
					gdouble x, gdouble y, gdouble width,
					guint8 r, guint8 g, guint8 b)
{
	PangoLayout *layout;
	PangoFontDescription *desc;
	gint lw, lh;
	GdkPixbuf *pixbuf;

	if (!pw->job_pixbuf) return FALSE;

	layout = gtk_widget_create_pango_layout(pw->dialog->dialog, NULL);

	desc = pango_font_description_new();
	pango_font_description_set_size(desc, convert_pango_dpi(point_size) * PANGO_SCALE);
	pango_layout_set_font_description(layout, desc);
	pango_font_description_free(desc);

	pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
	pango_layout_set_text(layout, text, -1);

	pango_layout_get_pixel_size(layout, &lw, &lh);
	x = x - (gdouble)lw / 2.0;

	pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, lw, lh);
	pixbuf_set_rect_fill(pixbuf, 0, 0, lw, lh, 0, 0, 0, 0);
	pixbuf_draw_layout(pixbuf, layout, pw->dialog->dialog, 0, 0, r, g, b, 255);
	g_object_unref(G_OBJECT(layout));

	print_job_preview_page_image(pw, pixbuf, x, y, (gdouble)lw, (gdouble)lh, 0, 0);
	g_object_unref(pixbuf);

	return TRUE;
}

static gint print_job_preview_init(PrintWindow *pw)
{
	if (pw->job_pixbuf) g_object_unref(pw->job_pixbuf);
	pw->job_pixbuf = image_get_pixbuf(pw->layout_image);
	g_object_ref(pw->job_pixbuf);

	return print_job_preview_page_new(pw, pw->job_page);
}


/*
 *-----------------------------------------------------------------------------
 * wrappers
 *-----------------------------------------------------------------------------
 */

static gint print_job_page_new(PrintWindow *pw)
{
	switch (pw->job_format)
		{
		case RENDER_FORMAT_RGB:
			return print_job_rgb_page_new(pw, pw->job_page);
		case RENDER_FORMAT_PS:
			return print_job_ps_page_new(pw, pw->job_page);
		case RENDER_FORMAT_PREVIEW:
			return print_job_preview_page_new(pw, pw->job_page);
		}

	return FALSE;
}

static gint print_job_page_done(PrintWindow *pw)
{
	switch (pw->job_format)
		{
		case RENDER_FORMAT_RGB:
			return print_job_rgb_page_done(pw);
		case RENDER_FORMAT_PS:
			return print_job_ps_page_done(pw);
		case RENDER_FORMAT_PREVIEW:
			return print_job_preview_page_done(pw);
		}

	return FALSE;
}

static gint print_job_page_image(PrintWindow *pw, GdkPixbuf *pixbuf,
				 gdouble x, gdouble y, gdouble w, gdouble h,
				 gdouble offx, gdouble offy)
{
	gint success = FALSE;

	if (w <= 0.0 || h <= 0.0) return TRUE;

	switch (pw->job_format)
		{
		case RENDER_FORMAT_RGB:
			success = print_job_rgb_page_image(pw, pixbuf, x, y, w, h, offx, offy);
			break;
		case RENDER_FORMAT_PS:
			success = print_job_ps_page_image(pw, pixbuf, x, y, w, h, offx, offy);
			break;
		case RENDER_FORMAT_PREVIEW:
			success = print_job_preview_page_image(pw, pixbuf, x, y, w, h, offx, offy);
			break;
		}

	return success;
}

static gint print_job_page_text(PrintWindow *pw, const gchar *text, gdouble point_size,
				gdouble x, gdouble y, gdouble width,
				guint8 r, guint8 g, guint8 b)
{
	gint success = TRUE;

	if (!text) return TRUE;

	switch (pw->job_format)
		{
		case RENDER_FORMAT_RGB:
			success = print_job_rgb_page_text(pw, text, point_size, x, y, width, r, g, b);
			break;
		case RENDER_FORMAT_PS:
			success = print_job_ps_page_text(pw, text, point_size, x, y, width, r, g, b);
			break;
		case RENDER_FORMAT_PREVIEW:
			success = print_job_preview_page_text(pw, text, point_size, x, y, width, r, g, b);
			break;
		}

	return success;
}

/*
 *-----------------------------------------------------------------------------
 * print ?
 *-----------------------------------------------------------------------------
 */

static gint print_job_render_image(PrintWindow *pw);
static gint print_job_render_proof(PrintWindow *pw);


static void print_job_status(PrintWindow *pw)
{
	gdouble value;
	gint page;
	gint total;
	gchar *buf;

	if (!pw->job_progress) return;

	page = pw->job_page;
	total = print_layout_page_count(pw);

	if (pw->layout == PRINT_LAYOUT_PROOF && pw->proof_point)
		{
		GList *start;

		start = g_list_first(pw->proof_point);
		value = (gdouble)g_list_position(start, pw->proof_point) / g_list_length(start);
		}
	else
		{
		value = (total > 0) ? (gdouble)page / total : 0.0;
		}

	buf = g_strdup_printf(_("Page %d"), page + 1);
	gtk_progress_bar_set_text(GTK_PROGRESS_BAR(pw->job_progress), buf);
	g_free(buf);

	if (pw->job_path && pw->job_progress_label)
		{
		gtk_label_set_text(GTK_LABEL(pw->job_progress_label), pw->job_path);
		}

	gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(pw->job_progress), value);
}

static void print_job_throw_error(PrintWindow *pw, const gchar *message)
{
	GenericDialog *gd;
	GtkWidget *parent = NULL;
	GtkWidget *group;
	GtkWidget *label;
	gchar *buf;

	if (GTK_WIDGET_VISIBLE(pw->dialog->dialog)) parent = pw->dialog->dialog;

	gd = generic_dialog_new(_("Printing error"), "GQview", "print_warning",
				parent, TRUE, NULL, NULL);
	generic_dialog_add_button(gd, GTK_STOCK_OK, NULL, NULL, TRUE);

	buf = g_strdup_printf(_("An error occured printing to %s."), print_output_name(pw->output));
	generic_dialog_add_message(gd, GTK_STOCK_DIALOG_ERROR, _("Printing error"), buf);
	g_free(buf);

	group = pref_group_new(gd->vbox, FALSE, _("Details"), GTK_ORIENTATION_VERTICAL);
	label = pref_label_new(group, message);
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);

	gtk_widget_show(gd->dialog);
}

static void print_job_done(PrintWindow *pw)
{
	print_job_close(pw, FALSE);
}

static gint print_job_text_image(PrintWindow *pw, const gchar *path,
				 gdouble x, gdouble y, gdouble width,
				 gint sw, gint sh, gint proof)
{
	GString *string;
	gint space = FALSE;
	gint newline = FALSE;
	gint ret;

	if (pw->text_fields == 0) return TRUE;

	string = g_string_new("");
	path = pw->job_loader->path;

	if (pw->text_fields & TEXT_INFO_FILENAME)
		{
		g_string_append(string, filename_from_path(path));
		newline = TRUE;
		}
	if (pw->text_fields & TEXT_INFO_DIMENSIONS)
		{
		if (newline) g_string_append(string, "\n");
		g_string_append_printf(string, "%d x %d", (gint)sw, (gint)sh);
		newline = proof;
		space = !proof;
		}
	if (pw->text_fields & TEXT_INFO_FILEDATE)
		{
		if (newline)  g_string_append(string, "\n");
		if (space) g_string_append(string, " - ");
		g_string_append(string, text_from_time(filetime(pw->job_loader->path)));
		newline = proof;
		space = !proof;
		}
	if (pw->text_fields & TEXT_INFO_FILESIZE)
		{
		gchar *size;

		if (newline)  g_string_append(string, "\n");
		if (space) g_string_append(string, " - ");
		size = text_from_size_abrev(filesize(pw->job_loader->path));
		g_string_append(string, size);
		g_free(size);
		}

	ret = print_job_page_text(pw, string->str, pw->text_points, x, y, width,
				  pw->text_r, pw->text_g, pw->text_b);

	g_string_free(string, TRUE);

	return ret;
}

static void print_job_render_image_loader_done(ImageLoader *il, gpointer data)
{
	PrintWindow *pw = data;
	GdkPixbuf *pixbuf;
	gint success = TRUE;

	pixbuf = image_loader_get_pixbuf(il);
	if (pixbuf)
		{
		gdouble sw, sh;
		gdouble dw, dh;
		gdouble x, y, w, h;
		gdouble scale;
		gdouble offx, offy;

		sw = (gdouble)gdk_pixbuf_get_width(pixbuf);
		sh = (gdouble)gdk_pixbuf_get_height(pixbuf);

		dw = pw->layout_width - pw->margin_left - pw->margin_right;
		dh = pw->layout_height - pw->margin_top - pw->margin_bottom;

		if (dw / sw < dh / sh)
			{
			w = dw;
			h = dw / sw * sh;
			scale = w / sw;
			}
		else
			{
			h = dh;
			w = dh / sh *sw;
			scale = h / sh;
			}

		if (pw->image_scale >= 5)
			{
			w = w * (gdouble)pw->image_scale / 100.0;
			h = h * (gdouble)pw->image_scale / 100.0;
			}

		x = pw->margin_left + (dw / 2) - (w / 2);
		y = pw->margin_top + (dh / 2) - (h / 2);

		offx = offy = 0;

		if (x < 0)
			{
			w += x;
			offx = x;
			x = 0;
			}
		if (x + w >= pw->layout_width) w = pw->layout_width - x;

		if (y < 0)
			{
			h += y;
			offy = y;
			y = 0;
			}
		if (y + h >= pw->layout_height) h = pw->layout_height - y;

		success = (success &&
			   print_job_page_image(pw, pixbuf, x, y, w, h, offx, offy));

		x = x + w / 2;
		y = y + h + PRINT_TEXT_PADDING;

		success = (success &&
			   print_job_text_image(pw, pw->job_loader->path, x, y, dw, sw, sh, FALSE));
		}

	image_loader_free(pw->job_loader);
	pw->job_loader = NULL;

	if (pw->job_format == RENDER_FORMAT_PREVIEW)
		{
		print_job_done(pw);
		return;
		}

	success = (success && print_job_page_done(pw));
	if (!success)
		{
		print_job_close(pw, TRUE);
		return;
		}

	pw->job_page++;
	print_job_status(pw);

	if (print_job_render_image(pw))
		{
		if (!print_job_page_new(pw)) print_job_close(pw, TRUE);
		}
	else
		{
		print_job_done(pw);
		}
}

static gint print_job_render_image(PrintWindow *pw)
{
	gchar *path = NULL;

	switch (pw->source)
		{
		case PRINT_SOURCE_SELECTION:
			path = g_list_nth_data(pw->source_selection, pw->job_page);
			break;
		case PRINT_SOURCE_ALL:
			path = g_list_nth_data(pw->source_list, pw->job_page);
			break;
		case PRINT_SOURCE_IMAGE:
		default:
			if (pw->job_page == 0) path = pw->source_path;
			break;
		}

	image_loader_free(pw->job_loader);
	pw->job_loader = NULL;

	if (!path) return FALSE;

	pw->job_loader = image_loader_new(path);
	if (!image_loader_start(pw->job_loader, print_job_render_image_loader_done, pw))
		{
		image_loader_free(pw->job_loader);
		pw->job_loader= NULL;
		}

	return TRUE;
}

static void print_job_render_proof_loader_done(ImageLoader *il, gpointer data)
{
	PrintWindow *pw = data;
	GdkPixbuf *pixbuf;
	gdouble x, y;
	gdouble w, h;
	gdouble proof_w, proof_h;
	gdouble icon_w, icon_h;
	gdouble scale;
	gint success = TRUE;

	if (pw->proof_columns < 1 || pw->proof_rows < 1)
		{
		image_loader_free(pw->job_loader);
		pw->job_loader = NULL;

		print_job_done(pw);

		return;
		}

	pixbuf = image_loader_get_pixbuf(il);

	w = gdk_pixbuf_get_width(pixbuf);
	h = gdk_pixbuf_get_height(pixbuf);

	if (pw->proof_width / w < pw->proof_height / h)
		{
		icon_w = pw->proof_width;
		icon_h = pw->proof_width / w * h;
		scale = icon_w / w;
		}
	else
		{
		icon_h = pw->proof_height;
		icon_w = pw->proof_height / h * w;
		scale = icon_h / h;
		}

	y = pw->proof_position / pw->proof_columns;
	x = pw->proof_position - (y * pw->proof_columns);

	print_proof_size(pw, &proof_w, &proof_h);

	x *= proof_w;
	y *= proof_h;
	x += pw->margin_left + (pw->layout_width - pw->margin_left - pw->margin_right - (pw->proof_columns * proof_w)) / 2 + (proof_w - icon_w) / 2;
	y += pw->margin_top + PRINT_PROOF_MARGIN + (pw->proof_height - icon_h) / 2;

	success = (success &&
		   print_job_page_image(pw, pixbuf, x, y, icon_w, icon_h, 0, 0));

	x = x + icon_w / 2;
	y = y + icon_h + (pw->proof_height - icon_h) / 2 + PRINT_TEXT_PADDING;

	success = (success && 
		   print_job_text_image(pw, pw->job_loader->path, x, y, icon_w + PRINT_PROOF_MARGIN * 2, w, h, TRUE));