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, 195 insertions, 0 deletions

diff --git a/source/blender/imbuf/intern/cineon/cineon_dpx.c b/source/blender/imbuf/intern/cineon/cineon_dpx.c
new file mode 100644
index 00000000000..d3cf74f60a9
--- /dev/null
+++ b/source/blender/imbuf/intern/cineon/cineon_dpx.c
@@ -0,0 +1,195 @@
+/**
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ * cineon.c
+ * contributors: joeedh
+ * I hearby donate this code and all rights to the Blender Foundation.
+ * $Id$
+ */
+ 
+#include <stdio.h>
+#include <string.h> /*for memcpy*/
+
+#include "logImageLib.h"
+#include "cineonlib.h"
+#include "dpxlib.h"
+
+#include "IMB_imbuf_types.h"
+#include "IMB_imbuf.h"
+
+#include "MEM_guardedalloc.h"
+
+static struct ImBuf *imb_load_dpx_cineon(unsigned char *mem, int use_cineon, int size, int flags)
+{
+	ImBuf *ibuf;
+	LogImageFile *image;
+	int x, y;
+	unsigned short *row;
+	int width, height, depth;
+	float *frow;
+	
+	image = logImageOpenFromMem(mem, size, use_cineon);
+	
+	if (!image) {
+		printf("no image!\n");
+		return NULL;
+	}
+	
+	logImageGetSize(image, &width, &height, &depth);
+	
+	if (depth != 3) { /*need to do greyscale loading eventually.*/
+		logImageClose(image);
+		return NULL;
+	}
+	if (width == 0 && height == 0) {
+		logImageClose(image);
+		return NULL;
+	}
+	
+	ibuf = IMB_allocImBuf(width, height, 32, IB_rectfloat | flags, 0);
+
+	row = MEM_mallocN(sizeof(unsigned short)*width*depth, "row in cineon_dpx.c");
+	
+	for (y = 0; y < height; y++) {
+		unsigned int index = (width) * (height-y-1);
+		index = index * 4;
+		
+		frow = &ibuf->rect_float[index];
+		
+		logImageGetRowBytes(image, row, y);
+		
+		for (x=0; x<width; x++) {
+			unsigned short *upix = &row[x*depth];
+			float *fpix = &frow[x*4];
+			fpix[0] = ((float)upix[0]) / 65535.0f;
+			fpix[1] = ((float)upix[1]) / 65535.0f;
+			fpix[2] = ((float)upix[2]) / 65535.0f;
+			fpix[3] = 1.0f;
+		}
+	}
+
+	MEM_freeN(row);
+	logImageClose(image);
+	
+	if (flags & IB_rect) {
+		IMB_rect_from_float(ibuf);
+	}
+	return ibuf;
+}
+
+static int imb_save_dpx_cineon(ImBuf *buf, char *filename, int use_cineon, int flags)
+{
+	LogImageByteConversionParameters conversion;
+	int width, height, depth;
+	LogImageFile* logImage;
+	unsigned short* line, *pixel;
+	int i, j;
+	int index;
+	float *fline;
+	
+	conversion.blackPoint = 95;
+	conversion.whitePoint = 685;
+	conversion.gamma = 1;
+	/*
+	 * Get the drawable for the current image...
+	 */
+
+	width = buf->x;
+	height = buf->y;
+	depth = 3;
+	
+	if (!buf->rect_float) return 0;
+	
+	logImageSetVerbose(0);
+	logImage = logImageCreate(filename, use_cineon, width, height, depth);
+
+	if (!logImage) return 0;
+	
+	logImageSetByteConversion(logImage, &conversion);
+
+	index = 0;
+	line = MEM_mallocN(sizeof(unsigned short)*depth*width, "line");
+	
+	/*note that image is flipped when sent to logImageSetRowBytes (see last passed parameter).*/
+	for (j = 0; j < height; ++j) {
+	fline = &buf->rect_float[width*j*4];
+	for (i=0; i<width; i++) {
+		float *fpix, fpix2[3];
+		/*we have to convert to cinepaint's 16-bit-per-channel here*/
+		pixel = &line[i*depth];
+		fpix = &fline[i*4];
+		memcpy(fpix2, fpix, sizeof(float)*3);
+		
+		if (fpix2[0]>=1) fpix2[0] = 1; 
+		if (fpix2[1]>=1) fpix2[1] = 1; 
+		if (fpix2[2]>=1) fpix2[2] = 1;
+		
+		pixel[0] = (unsigned short)(fpix2[0] * 65535.0f); /*float-float math is faster*/
+		pixel[1] = (unsigned short)(fpix2[1] * 65535.0f);
+		pixel[2] = (unsigned short)(fpix2[2] * 65535.0f);
+	}
+		logImageSetRowBytes(logImage, (const unsigned short*)line, height-1-j);
+	}
+	logImageClose(logImage);
+
+	MEM_freeN(line);
+	return 1;
+}
+
+short imb_savecineon(struct ImBuf *buf, char *myfile, int flags)
+{
+	return imb_save_dpx_cineon(buf, myfile, 1, flags);
+}
+
+ 
+int imb_is_cineon(void *buf)
+{
+	return cineonIsMemFileCineon(buf);
+}
+
+ImBuf *imb_loadcineon(unsigned char *mem, int size, int flags)
+{
+	if(imb_is_cineon(mem))
+		return imb_load_dpx_cineon(mem, 1, size, flags);
+	return NULL;
+}
+
+short imb_save_dpx(struct ImBuf *buf, char *myfile, int flags)
+{
+	return imb_save_dpx_cineon(buf, myfile, 0, flags);
+}
+
+short imb_is_dpx(void *buf)
+{
+	return dpxIsMemFileCineon(buf);
+}
+
+ImBuf *imb_loaddpx(unsigned char *mem, int size, int flags)
+{
+	if(imb_is_dpx(mem))
+		return imb_load_dpx_cineon(mem, 0, size, flags);
+	return NULL;
+}