Crop Compositing Node:

This commit adds a new node, crop, to the compositor. This node can be used to
crop input image. It has two modes of operation. It can either crop image
size (Crop Image Size option) or crop while retaining original size of the
image. This latter mode can be used to preview the crop.

Use X1, Y1, X2, Y2 controls to manage the area to be cropped.

Note that I added a check for image preview min and max values to node_update.
This is because it could give inappropriate values in certain cases when
Crop Image Size option was toggled (values such as x1=0, y1=0, x2=60, y2=0 would
result in eternal loop due to bad min and max (min bigger than max!)). The check 
makes sure that min and max values are always valid.

1 files changed, 119 insertions, 0 deletions

diff --git a/source/blender/nodes/intern/CMP_nodes/CMP_crop.c b/source/blender/nodes/intern/CMP_nodes/CMP_crop.c
new file mode 100644
index 00000000000..f3a00dec084
--- /dev/null
+++ b/source/blender/nodes/intern/CMP_nodes/CMP_crop.c
@@ -0,0 +1,119 @@
+/**
+ *
+ *
+ * ***** 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) 2006 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Juho Vepsäläinen
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include "../CMP_util.h"
+
+/* **************** Crop  ******************** */
+
+static bNodeSocketType cmp_node_crop_in[]= {
+	{	SOCK_RGBA, 1, "Image",			0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+static bNodeSocketType cmp_node_crop_out[]= {
+	{	SOCK_RGBA, 0, "Image",			0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+
+static void node_composit_exec_crop(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
+{
+	if(in[0]->data) {
+		NodeTwoXYs *ntxy= node->storage;
+		CompBuf *cbuf= in[0]->data;
+		CompBuf *stackbuf;
+		int x, y;
+		float *srcfp, *outfp;
+		rcti outputrect;
+
+		/* check input image size */
+		if(cbuf->x <= ntxy->x1 + 1)
+			ntxy->x1= cbuf->x - 1;
+
+		if(cbuf->y <= ntxy->y1 + 1)
+			ntxy->y1= cbuf->y - 1;
+
+		if(cbuf->x <= ntxy->x2 + 1)
+			ntxy->x2= cbuf->x - 1;
+
+		if(cbuf->y <= ntxy->y2 + 1)
+			ntxy->y2= cbuf->y - 1;
+
+		/* figure out the minimums and maximums */
+		outputrect.xmax=MAX2(ntxy->x1, ntxy->x2) + 1;
+		outputrect.xmin=MIN2(ntxy->x1, ntxy->x2);
+		outputrect.ymax=MAX2(ntxy->y1, ntxy->y2) + 1;
+		outputrect.ymin=MIN2(ntxy->y1, ntxy->y2);
+
+		if(node->custom1) {
+			/* this option crops the image size too  */	
+			stackbuf= get_cropped_compbuf(&outputrect, cbuf->rect, cbuf->x, cbuf->y, cbuf->type);
+		}
+		else {
+			/* this option won't crop the size of the image as well  */
+			/* allocate memory for the output image            */
+			stackbuf = alloc_compbuf(cbuf->x, cbuf->y, cbuf->type, 1);
+
+			/* select the cropped part of the image and set it to the output */
+			for(y=outputrect.ymin; y<outputrect.ymax; y++){
+				srcfp= cbuf->rect     + (y * cbuf->x     + outputrect.xmin) * cbuf->type;
+				outfp= stackbuf->rect + (y * stackbuf->x + outputrect.xmin) * stackbuf->type;
+				for(x=outputrect.xmin; x<outputrect.xmax; x++, outfp+= stackbuf->type, srcfp+= cbuf->type)
+                			memcpy(outfp, srcfp, sizeof(float)*stackbuf->type);
+			}
+		}
+
+		out[0]->data= stackbuf;
+	}
+}
+
+static void node_composit_init_crop(bNode* node)
+{
+   NodeTwoXYs *nxy= MEM_callocN(sizeof(NodeTwoXYs), "node xy data");
+   node->storage= nxy;
+   nxy->x1= 0;
+   nxy->x2= 0;
+   nxy->y1= 0;
+   nxy->y2= 0;
+}
+
+bNodeType cmp_node_crop= {
+	/* *next,*prev */	NULL, NULL,
+	/* type code   */	CMP_NODE_CROP,
+	/* name        */	"Crop",
+	/* width+range */	140, 100, 320,
+	/* class+opts  */	NODE_CLASS_DISTORT, NODE_OPTIONS,
+	/* input sock  */	cmp_node_crop_in,
+	/* output sock */	cmp_node_crop_out,
+	/* storage     */	"NodeTwoXYs",
+	/* execfunc    */	node_composit_exec_crop,
+	/* butfunc     */	NULL,
+	/* initfunc    */	node_composit_init_crop,
+	/* freestoragefunc    */	node_free_standard_storage,
+	/* copystoragefunc    */	node_copy_standard_storage,
+	/* id          */	NULL
+};