add "depth" param to tiffsave

Add a "depth" param to tiffsave to set pyramid depth, just like the
"depth" param on dzsave.

See https://github.com/libvips/libvips/issues/1485

ChangeLog

@@ -3,6 +3,7 @@
 - add @id to dzsave to set IIIF id property [regisrob]
 - add max and min to region shrink [rgluskin]
 - allow \ as an escape character in vips_break_token() [akemrir]
+- tiffsave has a "depth" param to set max pyr depth
 
 20/6/19 started 8.9.1
 - don't use the new source loaders for new_from_file or new_from_buffer, it

libvips/foreign/pforeign.h

@@ -61,7 +61,9 @@ int vips__tiff_write( VipsImage *in, const char *filename,
 	gboolean properties,
 	gboolean strip,
 	VipsRegionShrink region_shrink,
-	int level, gboolean lossless );
+	int level, 
+	gboolean lossless,
+	VipsForeignDzDepth depth );
 
 int vips__tiff_write_buf( VipsImage *in, 
 	void **obuf, size_t *olen, 
@@ -77,7 +79,9 @@ int vips__tiff_write_buf( VipsImage *in,
 	gboolean rgbjpeg,
 	gboolean properties, gboolean strip,
 	VipsRegionShrink region_shrink,
-	int level, gboolean lossless );
+	int level, 
+	gboolean lossless,
+	VipsForeignDzDepth depth );
 
 gboolean vips__istiff_source( VipsSource *source );
 gboolean vips__istifftiled_source( VipsSource *source );

libvips/foreign/tiffsave.c

@@ -19,6 +19,8 @@
  * 	- add @level and @lossless
  * 4/9/18 [f--f]
  * 	- xres/yres params were in pixels/cm
+ * 26/1/20
+ * 	- add "depth" to set pyr depth
  */
 
 /*
@@ -95,6 +97,7 @@ typedef struct _VipsForeignSaveTiff {
 	VipsRegionShrink region_shrink;
 	int level;
 	gboolean lossless;
+	VipsForeignDzDepth depth;
 } VipsForeignSaveTiff;
 
 typedef VipsForeignSaveClass VipsForeignSaveTiffClass;
@@ -330,6 +333,13 @@ vips_foreign_save_tiff_class_init( VipsForeignSaveTiffClass *class )
 		G_STRUCT_OFFSET( VipsForeignSaveTiff, lossless ),
 		FALSE );
 
+	VIPS_ARG_ENUM( class, "depth", 25, 
+		_( "Depth" ), 
+		_( "Pyramid depth" ),
+		VIPS_ARGUMENT_OPTIONAL_INPUT,
+		G_STRUCT_OFFSET( VipsForeignSaveTiff, depth ),
+		VIPS_TYPE_FOREIGN_DZ_DEPTH, VIPS_FOREIGN_DZ_DEPTH_ONETILE ); 
+
 }
 
 static void
@@ -346,6 +356,7 @@ vips_foreign_save_tiff_init( VipsForeignSaveTiff *tiff )
 	tiff->region_shrink = VIPS_REGION_SHRINK_MEAN;
 	tiff->level = 10;
 	tiff->lossless = FALSE;
+	tiff->depth = VIPS_FOREIGN_DZ_DEPTH_ONETILE; 
 }
 
 typedef struct _VipsForeignSaveTiffFile {
@@ -384,7 +395,8 @@ vips_foreign_save_tiff_file_build( VipsObject *object )
 		save->strip,
 		tiff->region_shrink,
 		tiff->level,
-		tiff->lossless ) )
+		tiff->lossless,
+		tiff->depth ) )
 		return( -1 );
 
 	return( 0 );
@@ -455,7 +467,8 @@ vips_foreign_save_tiff_buffer_build( VipsObject *object )
 		save->strip,
 		tiff->region_shrink,
 		tiff->level,
-		tiff->lossless ) )
+		tiff->lossless, 
+		tiff->depth ) )
 		return( -1 );
 
 	/* vips__tiff_write_buf() makes a buffer that needs g_free(), not
@@ -523,6 +536,7 @@ vips_foreign_save_tiff_buffer_init( VipsForeignSaveTiffBuffer *buffer )
  * * @region_shrink: #VipsRegionShrink How to shrink each 2x2 region.
  * * @level: %gint, Zstd compression level
  * * @lossless: %gboolean, WebP losssless mode
+ * * @depth: #VipsForeignDzDepth how deep to make the pyramid
  *
  * Write a VIPS image to a file as TIFF.
  *
@@ -564,6 +578,10 @@ vips_foreign_save_tiff_buffer_init( VipsForeignSaveTiffBuffer *buffer )
  * default each 2x2 block is just averaged, but you can set MODE or MEDIAN as
  * well.
  *
+ * By default, the pyramid stops when the image is small enough to fit in one
+ * tile. Use @depth to stop when the image fits in one pixel, or to only write
+ * a single layer.
+ *
  * Set @squash to make 8-bit uchar images write as 1-bit TIFFs. Values >128
  * are written as white, values <=128 as black. Normally vips will write
  * MINISBLACK TIFFs where black is a 0 bit, but if you set @miniswhite, it
@@ -642,6 +660,7 @@ vips_tiffsave( VipsImage *in, const char *filename, ... )
  * * @region_shrink: #VipsRegionShrink How to shrink each 2x2 region.
  * * @level: %gint, Zstd compression level
  * * @lossless: %gboolean, WebP losssless mode
+ * * @depth: #VipsForeignDzDepth how deep to make the pyramid
  *
  * As vips_tiffsave(), but save to a memory buffer. 
  *

libvips/foreign/vips2tiff.c

@@ -187,6 +187,8 @@
  * 	- add @level and @lossless
  * 18/12/19
  * 	- "squash" now squashes 3-band float LAB down to LABQ
+ * 26/1/20
+ * 	- add "depth" to set pyr depth
  */
 
 /*
@@ -327,6 +329,7 @@ struct _Wtiff {
 	VipsRegionShrink region_shrink; /* How to shrink regions */
 	int level;			/* zstd compression level */
 	gboolean lossless;		/* webp lossless mode */
+	VipsForeignDzDepth depth;	/* Pyr depth */
 
 	/* True if we've detected a toilet-roll image, plus the page height,
 	 * which has been checked to be a factor of im->Ysize.
@@ -420,19 +423,41 @@ wtiff_layer_new( Wtiff *wtiff, Layer *above, int width, int height )
 		layer->sub, width, height );
 	 */
 
-	if( wtiff->pyramid )
+	if( wtiff->pyramid ) {
+		int limitw, limith;
+
+		switch( wtiff->depth ) {
+		case VIPS_FOREIGN_DZ_DEPTH_ONEPIXEL:
+			limitw = limith = 1;
+			break;
+
+		case VIPS_FOREIGN_DZ_DEPTH_ONETILE:
+			limitw = wtiff->tilew;
+			limith = wtiff->tileh;
+			break;
+
+		case VIPS_FOREIGN_DZ_DEPTH_ONE:
+			limitw = wtiff->ready->Xsize;
+			limith = wtiff->ready->Ysize;
+			break;
+
+		default:
+			g_assert_not_reached();
+		}
+
 		/* We make another layer if the image is too large to fit in a
 		 * single tile, and if neither axis is greater than 1.
 		 *
 		 * Very tall or wide images might end up with a smallest layer
 		 * larger than one tile.
 		 */
-		if( (layer->width > wtiff->tilew || 
+		if( (layer->width > limitw || 
-			layer->height > wtiff->tileh) && 
+			layer->height > limith) && 
 		 	layer->width > 1 && 
 		 	layer->height > 1 ) 
 			layer->below = wtiff_layer_new( wtiff, layer, 
 				width / 2, height / 2 );
+	}
 
 	/* The name for the top layer is the output filename.
 	 *
@@ -969,7 +994,9 @@ wtiff_new( VipsImage *input, const char *filename,
 	gboolean properties,
 	gboolean strip,
 	VipsRegionShrink region_shrink,
-	int level, gboolean lossless )
+	int level, 
+	gboolean lossless,
+	VipsForeignDzDepth depth )
 {
 	Wtiff *wtiff;
 
@@ -1000,6 +1027,7 @@ wtiff_new( VipsImage *input, const char *filename,
 	wtiff->region_shrink = region_shrink;
 	wtiff->level = level;
 	wtiff->lossless = lossless;
+	wtiff->depth = depth;
 	wtiff->toilet_roll = FALSE;
 	wtiff->page_height = vips_image_get_page_height( input );
 	wtiff->image_height = input->Ysize;
@@ -1889,7 +1917,9 @@ vips__tiff_write( VipsImage *input, const char *filename,
 	gboolean rgbjpeg,
 	gboolean properties, gboolean strip,
 	VipsRegionShrink region_shrink,
-	int level, gboolean lossless )
+	int level, 
+	gboolean lossless,
+	VipsForeignDzDepth depth )
 {
 	Wtiff *wtiff;
 
@@ -1903,7 +1933,7 @@ vips__tiff_write( VipsImage *input, const char *filename,
 		compression, Q, predictor, profile,
 		tile, tile_width, tile_height, pyramid, squash,
 		miniswhite, resunit, xres, yres, bigtiff, rgbjpeg, 
-		properties, strip, region_shrink, level, lossless )) )
+		properties, strip, region_shrink, level, lossless, depth )) )
 		return( -1 );
 
 	if( wtiff_write_image( wtiff ) ) { 
@@ -1931,7 +1961,9 @@ vips__tiff_write_buf( VipsImage *input,
 	gboolean rgbjpeg,
 	gboolean properties, gboolean strip, 
 	VipsRegionShrink region_shrink,
-	int level, gboolean lossless )
+	int level, 
+	gboolean lossless,
+	VipsForeignDzDepth depth )
 {
 	Wtiff *wtiff;
 
@@ -1941,7 +1973,7 @@ vips__tiff_write_buf( VipsImage *input,
 		compression, Q, predictor, profile,
 		tile, tile_width, tile_height, pyramid, squash,
 		miniswhite, resunit, xres, yres, bigtiff, rgbjpeg, 
-		properties, strip, region_shrink, level, lossless )) )
+		properties, strip, region_shrink, level, lossless, depth )) )
 		return( -1 );
 
 	wtiff->obuf = obuf;