From d63dc50e7d0ac6f1adccd9507b41410e0cbb0faf Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ghostscript.com>
Date: Tue, 16 Nov 2010 15:20:19 +0000
Subject: Add a function fz_newpixmapwithdata that lets clients create pixmaps
 with a custom backing store.

---
 fitz/fitz.h       | 13 ++++---------
 fitz/res_pixmap.c | 22 +++++++++++++++++++---
 2 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/fitz/fitz.h b/fitz/fitz.h
index 0608a453..57161305 100644
--- a/fitz/fitz.h
+++ b/fitz/fitz.h
@@ -445,15 +445,10 @@ char *fz_objkindstr(fz_obj *obj);
 
 /*
  * Data buffers.
- *
- * A buffer owns the memory it has allocated, unless ownsdata is false,
- * in which case the creator of the buffer owns it.
  */
 
 typedef struct fz_buffer_s fz_buffer;
 
-#define FZ_BUFSIZE (8 * 1024)
-
 struct fz_buffer_s
 {
 	int refs;
@@ -462,14 +457,12 @@ struct fz_buffer_s
 };
 
 fz_buffer * fz_newbuffer(int size);
-fz_buffer * fz_newbufferwithmemory(unsigned char *data, int size);
+fz_buffer *fz_keepbuffer(fz_buffer *buf);
+void fz_dropbuffer(fz_buffer *buf);
 
 void fz_resizebuffer(fz_buffer *buf, int size);
 void fz_growbuffer(fz_buffer *buf);
 
-fz_buffer *fz_keepbuffer(fz_buffer *buf);
-void fz_dropbuffer(fz_buffer *buf);
-
 /*
  * Buffered reader.
  * Only the data between rp and wp is valid data.
@@ -598,8 +591,10 @@ struct fz_pixmap_s
 	fz_pixmap *mask; /* explicit soft/image mask */
 	fz_colorspace *colorspace;
 	unsigned char *samples;
+	int freesamples;
 };
 
+fz_pixmap *fz_newpixmapwithdata(fz_colorspace *colorspace, int x, int y, int w, int h, unsigned char *samples);
 fz_pixmap * fz_newpixmapwithrect(fz_colorspace *, fz_bbox bbox);
 fz_pixmap * fz_newpixmap(fz_colorspace *, int x, int y, int w, int h);
 fz_pixmap *fz_keeppixmap(fz_pixmap *pix);
diff --git a/fitz/res_pixmap.c b/fitz/res_pixmap.c
index 652d0426..4826502e 100644
--- a/fitz/res_pixmap.c
+++ b/fitz/res_pixmap.c
@@ -1,7 +1,7 @@
 #include "fitz.h"
 
 fz_pixmap *
-fz_newpixmap(fz_colorspace *colorspace, int x, int y, int w, int h)
+fz_newpixmapwithdata(fz_colorspace *colorspace, int x, int y, int w, int h, unsigned char *samples)
 {
 	fz_pixmap *pix;
 
@@ -21,11 +21,26 @@ fz_newpixmap(fz_colorspace *colorspace, int x, int y, int w, int h)
 		pix->n = 1 + colorspace->n;
 	}
 
-	pix->samples = fz_malloc(pix->w * pix->h * pix->n);
+	if (samples)
+	{
+		pix->samples = samples;
+		pix->freesamples = 0;
+	}
+	else
+	{
+		pix->samples = fz_malloc(pix->w * pix->h * pix->n);
+		pix->freesamples = 1;
+	}
 
 	return pix;
 }
 
+fz_pixmap *
+fz_newpixmap(fz_colorspace *colorspace, int x, int y, int w, int h)
+{
+	return fz_newpixmapwithdata(colorspace, x, y, w, h, NULL);
+}
+
 fz_pixmap *
 fz_newpixmapwithrect(fz_colorspace *colorspace, fz_bbox r)
 {
@@ -48,7 +63,8 @@ fz_droppixmap(fz_pixmap *pix)
 			fz_droppixmap(pix->mask);
 		if (pix->colorspace)
 			fz_dropcolorspace(pix->colorspace);
-		fz_free(pix->samples);
+		if (pix->freesamples)
+			fz_free(pix->samples);
 		fz_free(pix);
 	}
 }
-- 
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