From e170200fe3b0201407fd25667989892907117ece Mon Sep 17 00:00:00 2001
From: Ali Gholami Rudi <ali@rudi.ir>
Date: Mon, 27 Jun 2011 15:29:23 +0430
Subject: [PATCH] add djvu file support via libdjvulibre

Don't like either libdjvulibre or the djvu file format at all
but sometimes there are no other options.
---
 Makefile       |  14 ++++----
 djvu.c         | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 doc.c => pdf.c |   0
 3 files changed, 112 insertions(+), 6 deletions(-)
 create mode 100644 djvu.c
 rename doc.c => pdf.c (100%)

diff --git a/Makefile b/Makefile
index 40dde01..3b15836 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,14 @@
-MUPDF_PATH = .
+PREFIX = .
 CC = cc
-CFLAGS = -Wall -Os -I$(MUPDF_PATH)/include
-LDFLAGS = -lm -L$(MUPDF_PATH)/lib -lmupdf -lfitz -lfreetype -ljbig2dec -ljpeg -lz -lopenjpeg
+CFLAGS = -Wall -O2 -I$(PREFIX)/include
+LDFLAGS = -L$(PREFIX)/lib
 
 all: fbpdf
 .c.o:
 	$(CC) -c $(CFLAGS) $<
-fbpdf: fbpdf.o doc.o draw.o
-	$(CC) -o $@ $^ $(LDFLAGS)
+fbpdf: fbpdf.o pdf.o draw.o
+	$(CC) -o $@ $^ $(LDFLAGS) -lmupdf -lfitz -lfreetype -ljbig2dec -ljpeg -lz -lopenjpeg -lm
+fbdjvu: fbpdf.o djvu.o draw.o
+	$(CC) -o $@ $^ $(LDFLAGS) -ldjvulibre -ljpeg -lm -lstdc++
 clean:
-	-rm -f *.o fbpdf
+	-rm -f *.o fbpdf fbdjvu
diff --git a/djvu.c b/djvu.c
new file mode 100644
index 0000000..8e37789
--- /dev/null
+++ b/djvu.c
@@ -0,0 +1,104 @@
+#include <stdlib.h>
+#include <string.h>
+#include "ddjvuapi.h"
+#include "draw.h"
+#include "doc.h"
+
+#define MIN(a, b)	((a) < (b) ? (a) : (b))
+
+struct doc {
+	ddjvu_context_t *ctx;
+	ddjvu_document_t *doc;
+};
+
+int djvu_handle(struct doc *doc)
+{
+	ddjvu_message_t *msg;
+	msg = ddjvu_message_wait(doc->ctx);
+	while ((msg = ddjvu_message_peek(doc->ctx))) {
+		if (msg->m_any.tag == DDJVU_ERROR) {
+			fprintf(stderr,"ddjvu: %s\n", msg->m_error.message);
+			return 1;
+		}
+		ddjvu_message_pop(doc->ctx);
+	}
+	return 0;
+}
+
+static void djvu_render(ddjvu_page_t *page, int mode, void *bitmap, int cols,
+		ddjvu_rect_t *prect, ddjvu_rect_t *rrect)
+{
+	ddjvu_format_t *fmt;
+	fmt = ddjvu_format_create(DDJVU_FORMAT_GREY8, 0, 0);
+	ddjvu_format_set_row_order(fmt, 1);
+
+	ddjvu_page_render(page, mode, prect, rrect, fmt, cols, bitmap);
+	ddjvu_format_release(fmt);
+}
+
+#define SIZE		(1 << 13)
+static char img[SIZE * SIZE];
+
+int doc_draw(struct doc *doc, fbval_t *bitmap, int p, int rows, int cols,
+		int zoom, int rotate)
+{
+	ddjvu_page_t *page;
+	ddjvu_rect_t rect;
+	ddjvu_pageinfo_t info;
+	int iw, ih;
+	int i, j;
+	page = ddjvu_page_create_by_pageno(doc->doc, p - 1);
+	if (!page)
+		return -1;
+	if (!ddjvu_page_decoding_done(page))
+		if (djvu_handle(doc))
+			return -1;
+
+	ddjvu_document_get_pageinfo(doc->doc, p - 1, &info);
+	iw = ddjvu_page_get_width(page);
+	ih = ddjvu_page_get_height(page);
+	rect.x = 0;
+	rect.y = 0;
+	rect.w = iw;
+	rect.h = ih;
+
+	/* mode: DDJVU_RENDER_(BLACK|COLOR|BACKGROUND|FOREGROUND) */
+	djvu_render(page, DDJVU_RENDER_FOREGROUND, img, SIZE, &rect, &rect);
+	ddjvu_page_release(page);
+	for (i = 0; i < ih * zoom / 10; i++)
+		for (j = 0; j < iw * zoom / 10; j++)
+			bitmap[i * cols + j] = img[i * 10 / zoom * SIZE + j * 10 / zoom];
+	return 0;
+}
+
+int doc_pages(struct doc *doc)
+{
+	return ddjvu_document_get_pagenum(doc->doc);
+}
+
+struct doc *doc_open(char *path)
+{
+	struct doc *doc = malloc(sizeof(*doc));
+	doc->ctx = ddjvu_context_create("fbpdf");
+	if (!doc->ctx)
+		goto fail;
+	doc->doc = ddjvu_document_create_by_filename(doc->ctx, path, 1);
+	if (!doc->doc)
+		goto fail;
+	if (!ddjvu_document_decoding_done(doc->doc))
+		if (djvu_handle(doc))
+			goto fail;
+	return doc;
+fail:
+	doc_close(doc);
+	return NULL;
+}
+
+void doc_close(struct doc *doc)
+{
+	if (doc->doc)
+		ddjvu_context_release(doc->ctx);
+	if (doc->ctx)
+		ddjvu_document_release(doc->doc);
+	free(doc);
+}
diff --git a/doc.c b/pdf.c
similarity index 100%
rename from doc.c
rename to pdf.c
-- 
2.11.4.GIT