Common code to ensure we only premultiply pixmaps with additive colors.

1 files changed, 8 insertions, 1 deletions

diff --git a/include/mupdf/fitz/colorspace.h b/include/mupdf/fitz/colorspace.h
index 398503d1..8a1c5caf 100644
--- a/include/mupdf/fitz/colorspace.h
+++ b/include/mupdf/fitz/colorspace.h
@@ -29,6 +29,13 @@ int fz_colorspace_is_indexed(fz_context *ctx, fz_colorspace *cs);
 int fz_colorspace_is_lab(fz_context *ctx, fz_colorspace *cs);
 
 /*
+	fz_colorspace_is_subtractive: Return true if a colorspace is subtractive.
+
+	True for CMYK, Separation and DeviceN colorspaces.
+*/
+int fz_colorspace_is_subtractive(fz_context *ctx, fz_colorspace *pix);
+
+/*
 	fz_device_gray: Get colorspace representing device specific gray.
 */
 fz_colorspace *fz_device_gray(fz_context *ctx);
@@ -77,7 +84,7 @@ typedef void (fz_colorspace_convert_fn)(fz_context *ctx, fz_colorspace *cs, cons
 
 typedef void (fz_colorspace_destruct_fn)(fz_context *ctx, fz_colorspace *cs);
 
-fz_colorspace *fz_new_colorspace(fz_context *ctx, char *name, int n, fz_colorspace_convert_fn *to_rgb, fz_colorspace_convert_fn *from_rgb, fz_colorspace_destruct_fn *destruct, void *data, size_t size);
+fz_colorspace *fz_new_colorspace(fz_context *ctx, char *name, int n, int is_subtractive, fz_colorspace_convert_fn *to_rgb, fz_colorspace_convert_fn *from_rgb, fz_colorspace_destruct_fn *destruct, void *data, size_t size);
 fz_colorspace *fz_new_indexed_colorspace(fz_context *ctx, fz_colorspace *base, int high, unsigned char *lookup);
 fz_colorspace *fz_keep_colorspace(fz_context *ctx, fz_colorspace *colorspace);
 void fz_drop_colorspace(fz_context *ctx, fz_colorspace *colorspace);