From c19e1ab67f06bf11e12dac08685a28753a3b276e Mon Sep 17 00:00:00 2001
From: Robin Watts <robin.watts@artifex.com>
Date: Wed, 25 Oct 2017 16:58:50 +0100
Subject: Expose text filtering through pdf_clean interface.

---
 include/mupdf/pdf/font.h      |  2 ++
 include/mupdf/pdf/interpret.h |  3 +++
 include/mupdf/pdf/page.h      | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+)

(limited to 'include')

diff --git a/include/mupdf/pdf/font.h b/include/mupdf/pdf/font.h
index 23bc77bf..10571f0b 100644
--- a/include/mupdf/pdf/font.h
+++ b/include/mupdf/pdf/font.h
@@ -1,6 +1,8 @@
 #ifndef MUPDF_PDF_FONT_H
 #define MUPDF_PDF_FONT_H
 
+#include "mupdf/pdf/cmap.h"
+
 /*
  * Font
  */
diff --git a/include/mupdf/pdf/interpret.h b/include/mupdf/pdf/interpret.h
index 68f1a71c..f7104499 100644
--- a/include/mupdf/pdf/interpret.h
+++ b/include/mupdf/pdf/interpret.h
@@ -1,6 +1,9 @@
 #ifndef PDF_INTERPRET_H
 #define PDF_INTERPRET_H
 
+#include "mupdf/pdf/font.h"
+#include "mupdf/pdf/resource.h"
+
 typedef struct pdf_csi_s pdf_csi;
 typedef struct pdf_gstate_s pdf_gstate;
 typedef struct pdf_processor_s pdf_processor;
diff --git a/include/mupdf/pdf/page.h b/include/mupdf/pdf/page.h
index 969aedf0..f904a7c1 100644
--- a/include/mupdf/pdf/page.h
+++ b/include/mupdf/pdf/page.h
@@ -1,6 +1,8 @@
 #ifndef MUPDF_PDF_PAGE_H
 #define MUPDF_PDF_PAGE_H
 
+#include "mupdf/pdf/interpret.h"
+
 int pdf_lookup_page_number(fz_context *ctx, pdf_document *doc, pdf_obj *pageobj);
 int pdf_count_pages(fz_context *ctx, pdf_document *doc);
 pdf_obj *pdf_lookup_page_obj(fz_context *ctx, pdf_document *doc, int needle);
@@ -168,6 +170,38 @@ void pdf_clean_page_contents(fz_context *ctx, pdf_document *doc, pdf_page *page,
 void pdf_clean_annot_contents(fz_context *ctx, pdf_document *doc, pdf_annot *annot, fz_cookie *cookie,
 	pdf_page_contents_process_fn *proc, void *proc_arg, int ascii);
 
+/*
+	pdf_filter_page_contents: Performs the same task as
+	pdf_clean_page_contents, but with an optional text filter
+	function.
+
+	text_filter: Function to assess whether a given character
+	should be kept (return 0) or removed (return 1).
+
+	after_text: Function called after each text object is closed
+	to allow other output to be sent.
+
+	arg: Opaque value to be passed to callback functions.
+*/
+void pdf_filter_page_contents(fz_context *ctx, pdf_document *doc, pdf_page *page, fz_cookie *cookie,
+	pdf_page_contents_process_fn *proc_fn, pdf_text_filter_fn *text_filter, pdf_after_text_object_fn *after_text, void *arg, int ascii);
+
+/*
+	pdf_filter_annot_contents: Performs the same task as
+	pdf_clean_annot_contents, but with an optional text filter
+	function.
+
+	text_filter: Function to assess whether a given character
+	should be kept (return 0) or removed (return 1).
+
+	after_text: Function called after each text object is closed
+	to allow other output to be sent.
+
+	arg: Opaque value to be passed to callback functions.
+*/
+void pdf_filter_annot_contents(fz_context *ctx, pdf_document *doc, pdf_annot *annot, fz_cookie *cookie,
+	pdf_page_contents_process_fn *proc, pdf_text_filter_fn *text_filter, pdf_after_text_object_fn *after_text, void *arg, int ascii);
+
 /*
 	Presentation interface.
 */
-- 
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