New: Import/Export of Cineon and DPX image files. The first is Kodak's

standard for film scanning, 10 bits/channel and logarithmic. DPX is
derived from Cineon as the ANSI/SMPTE industry standard.
DPX supports 16 bits color/channel, linear as well as logarithmic.

Code has been gratefully copied from CinePaint and was integrated in
Blender by Joe Eagar.

According to CinePaint's dev Robin Rowe the DPX code defaults to log
colorspace. Can't find in the code clues yet how to enable/disable that.
However, tests with write/read of DPX seems to show no visible loss by
log conversion code. Might be because it uses the entire 16 bit range...

CinePaint dpx files have been succesfully imported in a Quantel IQ HD/2K
finishing/grading set without problem, so for now I guess we can
use it! :)

Changes in code: added tests for image magic numbers before entering
the actual reading code. Prevents error prints, and makes it faster too.
(Note; this because Blender doesn't check for extensions, but calls
reading functions on every file until one accepts it. :)

1 files changed, 109 insertions, 0 deletions

diff --git a/source/blender/imbuf/intern/cineon/logImageCore.h b/source/blender/imbuf/intern/cineon/logImageCore.h
new file mode 100644
index 00000000000..1af18d5e3b8
--- /dev/null
+++ b/source/blender/imbuf/intern/cineon/logImageCore.h
@@ -0,0 +1,109 @@
+/*
+ *	 Cineon image file format library definitions.
+ *	 Cineon and DPX common structures.
+ *
+ *	 This header file contains private details.
+ *	 User code should generally use cineonlib.h and dpxlib.h only.
+ *	 Hmm. I thought the two formats would have more in common!
+ *
+ *	 Copyright 1999,2000,2001 David Hodson <hodsond@acm.org>
+ *
+ *	 This program is free software; you can redistribute it and/or modify it
+ *	 under the terms of the GNU General Public License as published by the Free
+ *	 Software Foundation; either version 2 of the License, or (at your option)
+ *	 any later version.
+ *
+ *	 This program is distributed in the hope that it will be useful, but
+ *	 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ *	 or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU General Public License
+ *	 for more details.
+ *
+ *	 You should have received a copy of the GNU General Public License
+ *	 along with this program; if not, write to the Free Software
+ *	 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#ifndef _LOG_IMAGE_CORE_H_
+#define _LOG_IMAGE_CORE_H_
+
+#include <stdio.h>
+#include "logImageLib.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef int (GetRowFn)(LogImageFile* logImage, unsigned short* row, int lineNum);
+typedef int (SetRowFn)(LogImageFile* logImage, const unsigned short* row, int lineNum);
+typedef void (CloseFn)(LogImageFile* logImage);
+
+struct _Log_Image_File_t_
+{
+	/* specified in header */
+	int width;
+	int height;
+	int depth;
+	int bitsPerPixel;
+	int imageOffset;
+
+	/* file buffer, measured in longwords (4 byte) */
+	int lineBufferLength;
+	unsigned int* lineBuffer;
+
+	/* pixel buffer, holds 10 bit pixel values */
+	unsigned short* pixelBuffer;
+	int pixelBufferUsed;
+
+	/* io stuff */
+	FILE* file;
+	int reading;
+	int fileYPos;
+
+	/* byte conversion stuff */
+	LogImageByteConversionParameters params;
+#if 0
+	float gamma;
+	int blackPoint;
+	int whitePoint;
+#endif
+	unsigned char lut10[1024];
+	unsigned short lut8[256];
+
+	/* pixel access functions */
+	GetRowFn* getRow;
+	SetRowFn* setRow;
+	CloseFn* close;
+	
+	unsigned char *membuffer;
+	unsigned long membuffersize;
+	unsigned char *memcursor;
+};
+
+void setupLut(LogImageFile*);
+
+int pixelsToLongs(int numPixels);
+
+/* typedefs used in original docs */
+/* note size assumptions! */
+
+typedef unsigned int U32;
+typedef unsigned short U16;
+typedef unsigned char U8;
+typedef signed int S32;
+typedef float R32;
+typedef char ASCII;
+
+R32 htonf(R32 f);
+R32 ntohf(R32 f);
+R32 undefined();
+U16 reverseU16(U16 value);
+U32 reverseU32(U32 value);
+R32 reverseR32(R32 value);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LOG_IMAGE_CORE_H_ */