From 62d3d8ca0e406e1a916ebcc8288d17d8058236af Mon Sep 17 00:00:00 2001
From: Sebastian Rasmussen <sebras@gmail.com>
Date: Wed, 5 Sep 2018 17:45:19 +0800
Subject: jni: Add StructuredTextWalker interface.

---
 .../src/com/artifex/mupdf/fitz/StructuredText.java | 60 +++++++++++++++++++++-
 .../artifex/mupdf/fitz/StructuredTextWalker.java   | 11 ++++
 2 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 platform/java/src/com/artifex/mupdf/fitz/StructuredTextWalker.java

(limited to 'platform/java/src')

diff --git a/platform/java/src/com/artifex/mupdf/fitz/StructuredText.java b/platform/java/src/com/artifex/mupdf/fitz/StructuredText.java
index 82aa55ea..19b85335 100644
--- a/platform/java/src/com/artifex/mupdf/fitz/StructuredText.java
+++ b/platform/java/src/com/artifex/mupdf/fitz/StructuredText.java
@@ -1,5 +1,7 @@
 package com.artifex.mupdf.fitz;
 
+import java.util.ArrayList;
+
 public class StructuredText
 {
 	static {
@@ -23,7 +25,63 @@ public class StructuredText
 	public native Quad[] highlight(Point a, Point b);
 	public native String copy(Point a, Point b);
 
-	public native TextBlock[] getBlocks();
+	public native void walk(StructuredTextWalker walker);
+
+	public TextBlock[] getBlocks() {
+		BlockWalker walker = new BlockWalker();
+		walk(walker);
+		return walker.getBlocks();
+	}
+
+	class BlockWalker implements StructuredTextWalker {
+		ArrayList<TextBlock> blocks;
+		ArrayList<TextLine> lines;
+		ArrayList<TextChar> chrs;
+		Rect lineBbox;
+		Rect blockBbox;
+
+		BlockWalker() {
+			blocks = new ArrayList<TextBlock>();
+		}
+
+		public void onImageBlock(Rect bbox, Matrix transform, Image image) {
+		}
+
+		public void beginTextBlock(Rect bbox) {
+			lines = new ArrayList<TextLine>();
+			blockBbox = bbox;
+		}
+
+		public void endTextBlock() {
+			TextBlock block = new TextBlock();
+			block.bbox = blockBbox;
+			block.lines = (TextLine[]) lines.toArray(new TextLine[0]);
+			blocks.add(block);
+		}
+
+		public void beginLine(Rect bbox, int wmode) {
+			chrs = new ArrayList<TextChar>();
+			lineBbox = bbox;
+		}
+
+		public void endLine() {
+			TextLine line = new TextLine();
+			line.bbox = lineBbox;
+			line.chars =  chrs.toArray(new TextChar[0]);
+			lines.add(line);
+		}
+
+		public void onChar(int c, Point origin, Font font, float size, Quad quad) {
+			TextChar chr = new TextChar();
+			chr.c = c;
+			chr.quad = quad;
+			chrs.add(chr);
+		}
+
+		TextBlock[] getBlocks() {
+			return (TextBlock[]) blocks.toArray(new TextBlock[0]);
+		}
+	}
 
 	public class TextBlock {
 		public TextLine[] lines;
diff --git a/platform/java/src/com/artifex/mupdf/fitz/StructuredTextWalker.java b/platform/java/src/com/artifex/mupdf/fitz/StructuredTextWalker.java
new file mode 100644
index 00000000..b38686ca
--- /dev/null
+++ b/platform/java/src/com/artifex/mupdf/fitz/StructuredTextWalker.java
@@ -0,0 +1,11 @@
+package com.artifex.mupdf.fitz;
+
+public interface StructuredTextWalker
+{
+	void onImageBlock(Rect bbox, Matrix transform, Image image);
+	void beginTextBlock(Rect bbox);
+	void endTextBlock();
+	void beginLine(Rect bbox, int wmode);
+	void endLine();
+	void onChar(int c, Point origin, Font font, float size, Quad q);
+}
-- 
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