add @format and @interpretation to rawload

ChangeLog

@@ -11,7 +11,9 @@
 - add vips_switch() / vips_case() ... fast many-way ifthenelse
 - better const handling for arithmetic operators fixes comparisons against out
   of range values
+- sharpen restores input colourspace
 - handle alpha in heifload / heifsave [meyermarcel]
+- add @interpretation and @format to rawload
 
 31/8/19 started 8.8.3
 - revert sharpen restoring the input colourspace

libvips/foreign/rawload.c

@@ -1,6 +1,8 @@
 /* load raw data from a file
  *
  * 14/12/11
+ * 5/8/19
+ * 	- add @format and @interpretation
  */
 
 /*
@@ -53,6 +55,8 @@ typedef struct _VipsForeignLoadRaw {
 	int height;
 	int bands;
 	guint64 offset;
+	VipsBandFormat format;
+	VipsInterpretation interpretation;
 } VipsForeignLoadRaw;
 
 typedef VipsForeignLoadClass VipsForeignLoadRawClass;
@@ -76,20 +80,34 @@ static int
 vips_foreign_load_raw_header( VipsForeignLoad *load )
 {
 	VipsForeignLoadRaw *raw = (VipsForeignLoadRaw *) load;
-	VipsImage *out;
-	VipsImage *out2;
 
-	if( !(out2 = vips_image_new_from_file_raw( raw->filename, 
-		raw->width, raw->height, raw->bands, raw->offset )) )
+	VipsImage *out;
+	VipsImage *x;
+
+	if( !(out = vips_image_new_from_file_raw( raw->filename, 
+		raw->width, raw->height, 
+		vips_format_sizeof_unsafe( raw->format ) * raw->bands,
+		raw->offset )) )
 		return( -1 );
 
+	if( vips_copy( out, &x,
+		"interpretation", raw->interpretation,
+		"format", raw->format,
+		"bands", raw->bands,
+		NULL ) ) {
+		g_object_unref( out );
+		return( -1 );
+	}
+	g_object_unref( out );
+	out = x;
+
 	/* Remove the @out that's there now. 
 	 */
-	g_object_get( load, "out", &out, NULL ); 
-	g_object_unref( out );
-	g_object_unref( out );
+	g_object_get( load, "out", &x, NULL ); 
+	g_object_unref( x );
+	g_object_unref( x );
 
-	g_object_set( load, "out", out2, NULL ); 
+	g_object_set( load, "out", out, NULL ); 
 
 	return( 0 );
 }
@@ -147,11 +165,27 @@ vips_foreign_load_raw_class_init( VipsForeignLoadRawClass *class )
 		G_STRUCT_OFFSET( VipsForeignLoadRaw, offset ),
 		0, 100000000000, 0 );
 
+	VIPS_ARG_ENUM( class, "format", 24, 
+		_( "Format" ), 
+		_( "Pixel format in image" ),
+		VIPS_ARGUMENT_OPTIONAL_INPUT,
+		G_STRUCT_OFFSET( VipsForeignLoadRaw, format ),
+		VIPS_TYPE_BAND_FORMAT, VIPS_FORMAT_UCHAR ); 
+
+	VIPS_ARG_ENUM( class, "interpretation", 25, 
+		_( "Interpretation" ), 
+		_( "Pixel interpretation" ),
+		VIPS_ARGUMENT_OPTIONAL_INPUT,
+		G_STRUCT_OFFSET( VipsForeignLoadRaw, interpretation ),
+		VIPS_TYPE_INTERPRETATION, VIPS_INTERPRETATION_MULTIBAND ); 
+
 }
 
 static void
 vips_foreign_load_raw_init( VipsForeignLoadRaw *raw )
 {
+	raw->format = VIPS_FORMAT_UCHAR;
+	raw->interpretation = VIPS_INTERPRETATION_MULTIBAND;
 }
 
 /**
@@ -166,14 +200,18 @@ vips_foreign_load_raw_init( VipsForeignLoadRaw *raw )
  * Optional arguments:
  *
  * * @offset: %guint64, offset in bytes from start of file
+ * * @format: #VipsBandFormat, set image format
+ * * @interpretation: #VipsInterpretation, set image interpretation
  *
  * This operation mmaps the file, setting up @out so that access to that 
  * image will read from the file. 
  *
- * @out will be a 8-bit uchar image with @bands image bands, so @bands can 
- * be thought of as meaning "number of bytes per pixel". Use functions 
- * like vips_copy() to set the exact band format, number of bands, 
- * and so on. Use vips_byteswap() to reverse the byte ordering. 
+ * By default, it assumes uchar pixels. Use @format to select something else.
+ *
+ * The image will be tagged as #VIPS_INTERPRETATION_MULTIBAND. Use
+ * @interpretation to select something else.
+ *
+ * Use vips_byteswap() to reverse the byte ordering if necessary. 
  *
  * See also: vips_image_new_from_file(), vips_copy(), vips_byteswap().
  *