im_insertplace() fixups

ChangeLog

@@ -68,6 +68,7 @@
   function
 - added im_copy_file()
 - added im_insertplaceset()
+- im_insertplace() allows small to be outside big
 
 25/3/09 started 7.18.0
 - revised version numbers

TODO

@@ -1,15 +1,5 @@
 - more stuff from util.c? too much to do it all now
 
-- how about an indexed histogram?
-
-  have two images, a 1-band index image and an n-band image to analyze
-
-  for each pixel, add the n-band pixel to the bin indicated by the index image
-
-
-
-
-
 - load 500 jpegs, shrink, save
 
   VM use is huge, ouch, could we use a bit less?

libvips/include/vips/check.h

@@ -56,6 +56,7 @@ int im_check_u8or16( const char *domain, IMAGE *im );
 int im_check_same_size( const char *domain, IMAGE *im1, IMAGE *im2 );
 int im_check_same_bands( const char *domain, IMAGE *im1, IMAGE *im2 );
 int im_check_same_format( const char *domain, IMAGE *im1, IMAGE *im2 );
+int im_check_same_coding( const char *domain, IMAGE *im1, IMAGE *im2 );
 int im_check_vector( const char *domain, int n, IMAGE *im );
 
 gboolean im_isuint( IMAGE *im );

libvips/inplace/im_insertplace.c

@@ -1,12 +1,4 @@
-/* @(#) Insert an image into another. Like im_insert, but an `in-place'
- * @(#) operation. small must fit entirely inside big - no clipping is
- * @(#) performed.
- * @(#) 
- * @(#) int 
- * @(#) im_insertplace( big, small, x, y )
- * @(#) IMAGE *big, *small;
- * @(#) int x, y;
- * @(#) 
+/* in-place insert
  *
  * Copyright: J. Cupitt
  * Written: 15/06/1992
@@ -21,6 +13,9 @@
  * 	- im_invalidate() after paint
  * 24/3/09
  * 	- added IM_CODING_RAD support
+ * 21/10/09
+ * 	- allow small to be outside big
+ * 	- gtkdoc
  */
 
 /*
@@ -64,37 +59,41 @@
 #include <dmalloc.h>
 #endif /*WITH_DMALLOC*/
 
-/* Like im_insert, but perform an in-place insertion.
+/**
+ * im_insertplace:
+ * @big: main image
+ * @small: sub-image to insert
+ * @x: position to insert
+ * @y: position to insert
+ *
+ * Copy @small into @big at position @x, @y. The two images must match in
+ * format, bands and coding.
+ *
+ * This an inplace operation, so @big is changed. It does not thread and will
+ * not work well as part of a pipeline.
+ *
+ * Returns: 0 on success, or -1 on error.
+ *
+ * See also: im_insert().
  */
 int
 im_insertplace( IMAGE *big, IMAGE *small, int x, int y )
 {	
-	Rect br, sr;
+	Rect br, sr, clip;
 	PEL *p, *q;
 	int z;
 
-	/* Check IO.
-	 */
-	if( im_rwcheck( big ) || im_incheck( small ) )
-		return( -1 );
-
 	/* Check compatibility.
 	 */
-        if( big->BandFmt != small->BandFmt || big->Bands != small->Bands ||
-                big->Coding != small->Coding ) {
-                im_error( "im_insertplace", "%s", 
-			_( "inputs differ in format" ) );
-                return( -1 );
-        }
-        if( big->Coding != IM_CODING_NONE && 
-		big->Coding != IM_CODING_LABQ &&
-		big->Coding != IM_CODING_RAD ) {
-                im_error( "im_insertplace", "%s", 
-			_( "Coding should be NONE, LABQ or RAD" ) ); 
-                return( -1 );
-        }
+	if( im_rwcheck( big ) || 
+		im_incheck( small ) ||
+		im_check_known_coded( "im_insertplace", big ) ||
+		im_check_known_coded( "im_insertplace", small ) ||
+		im_check_same_format( "im_insertplace", big, small ) ||
+		im_check_same_bands( "im_insertplace", big, small ) )
+		return( -1 );
 
-	/* Make rects for big and small.
+	/* Make rects for big and small and clip.
 	 */
 	br.left = 0;
 	br.top = 0;
@@ -104,21 +103,17 @@ im_insertplace( IMAGE *big, IMAGE *small, int x, int y )
 	sr.top = y;
 	sr.width = small->Xsize;
 	sr.height = small->Ysize;
-
-	/* Small fits inside big?
-	 */
-	if( !im_rect_includesrect( &br, &sr ) ) {
-		im_error( "im_insertplace", 
-			"%s", _( "small not inside big" ) );
-		return( -1 );
-	}
+	im_rect_intersectrect( &br, &sr, &clip );
+	if( im_rect_isempty( &clip ) )
+		return( 0 );
 
 	/* Loop, memcpying small to big.
 	 */
-	p = (PEL *) IM_IMAGE_ADDR( small, 0, 0 );
-	q = (PEL *) IM_IMAGE_ADDR( big, x, y );
-	for( z = 0; z < small->Ysize; z++ ) {
-		memcpy( (char *) q, (char *) p, IM_IMAGE_SIZEOF_LINE( small ) );
+	p = (PEL *) IM_IMAGE_ADDR( small, clip.left - x, clip.top - y );
+	q = (PEL *) IM_IMAGE_ADDR( big, clip.left, clip.top );
+	for( z = 0; z < clip.height; z++ ) {
+		memcpy( (char *) q, (char *) p, 
+			clip.width * IM_IMAGE_SIZEOF_PEL( small ) );
 		p += IM_IMAGE_SIZEOF_LINE( small );
 		q += IM_IMAGE_SIZEOF_LINE( big );
 	}

libvips/iofuncs/check.c

@@ -840,6 +840,32 @@ im_check_same_format( const char *domain, IMAGE *im1, IMAGE *im2 )
 	return( 0 );
 }
 
+/**
+ * im_check_same_coding:
+ * @domain: the originating domain for the error message
+ * @im1: first image to check
+ * @im2: second image to check
+ *
+ * Check that the images have the same coding.
+ * If not, set an error message
+ * and return non-zero.
+ *
+ * Returns: 0 if OK, -1 otherwise.
+ *
+ * See also: im_error().
+ */
+int
+im_check_same_coding( const char *domain, IMAGE *im1, IMAGE *im2 )
+{
+	if( im1->Coding != im2->Coding ) {
+		im_error( domain, "%s", 
+			_( "images must have the same coding" ) ); 
+		return( -1 );
+	}
+
+	return( 0 );
+}
+
 /**
  * im_check_same_vector:
  * @domain: the originating domain for the error message