From 69815ed8f21f60ff382e129e21f85f77a67a52be Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ghostscript.com>
Date: Mon, 29 Nov 2010 01:52:36 +0000
Subject: Apply soft masks from gstate to individual objects.

---
 mupdf/pdf_build.c     | 83 +++++++++++++++++++++++++++++++++++++--------------
 mupdf/pdf_interpret.c |  3 +-
 2 files changed, 63 insertions(+), 23 deletions(-)

diff --git a/mupdf/pdf_build.c b/mupdf/pdf_build.c
index 43bb7c00..7cb5fe78 100644
--- a/mupdf/pdf_build.c
+++ b/mupdf/pdf_build.c
@@ -185,6 +185,13 @@ pdf_showpattern(pdf_csi *csi, pdf_pattern *pat, fz_rect bbox, int what)
 		pdf_unsetpattern(csi, what);
 	}
 
+	/* don't apply softmasks to objects in the pattern as well */
+	if (gstate->softmask)
+	{
+		pdf_dropxobject(gstate->softmask);
+		gstate->softmask = nil;
+	}
+
 	ptm = fz_concat(pat->matrix, csi->topctm);
 	invptm = fz_invertmatrix(ptm);
 
@@ -222,6 +229,45 @@ cleanup:
 	pdf_grestore(csi);
 }
 
+void
+pdf_begingroup(pdf_csi *csi, fz_rect bbox)
+{
+	pdf_gstate *gstate = csi->gstate + csi->gtop;
+	fz_error error;
+
+	if (gstate->softmask)
+	{
+		pdf_xobject *softmask = gstate->softmask;
+		bbox = fz_transformrect(gstate->ctm, bbox);
+
+		gstate->softmask = nil;
+
+		csi->dev->beginmask(csi->dev->user, bbox, gstate->luminosity,
+			softmask->colorspace, gstate->softmaskbc);
+		error = pdf_runxobject(csi, nil, softmask);
+		if (error)
+			fz_catch(error, "cannot run softmask");
+		csi->dev->endmask(csi->dev->user);
+
+		gstate->softmask = softmask;
+	}
+
+	if (gstate->blendmode != FZ_BNORMAL || gstate->softmask)
+		csi->dev->begingroup(csi->dev->user, bbox, 0, 0, gstate->blendmode, 1);
+}
+
+void
+pdf_endgroup(pdf_csi *csi)
+{
+	pdf_gstate *gstate = csi->gstate + csi->gtop;
+
+	if (gstate->blendmode != FZ_BNORMAL || gstate->softmask)
+		csi->dev->endgroup(csi->dev->user);
+
+	if (gstate->softmask)
+		csi->dev->popclip(csi->dev->user);
+}
+
 void
 pdf_showshade(pdf_csi *csi, fz_shade *shd)
 {
@@ -230,13 +276,11 @@ pdf_showshade(pdf_csi *csi, fz_shade *shd)
 
 	bbox = fz_boundshade(shd, gstate->ctm);
 
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->begingroup(csi->dev->user, bbox, 0, 0, gstate->blendmode, 1);
+	pdf_begingroup(csi, bbox);
 
 	csi->dev->fillshade(csi->dev->user, shd, gstate->ctm, gstate->fill.alpha);
 
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->endgroup(csi->dev->user);
+	pdf_endgroup(csi);
 }
 
 void
@@ -247,11 +291,11 @@ pdf_showimage(pdf_csi *csi, fz_pixmap *image)
 
 	bbox = fz_transformrect(gstate->ctm, fz_unitrect);
 
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->begingroup(csi->dev->user, bbox, 0, 0, gstate->blendmode, 1);
 
 	if (image->mask)
 		csi->dev->clipimagemask(csi->dev->user, image->mask, gstate->ctm);
+	else /* TODO: only skip gstate softmask for softmasked images? */
+		pdf_begingroup(csi, bbox);
 
 	if (!image->colorspace)
 	{
@@ -289,9 +333,8 @@ pdf_showimage(pdf_csi *csi, fz_pixmap *image)
 
 	if (image->mask)
 		csi->dev->popclip(csi->dev->user);
-
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->endgroup(csi->dev->user);
+	else
+		pdf_endgroup(csi);
 }
 
 void
@@ -307,6 +350,11 @@ pdf_showpath(pdf_csi *csi, int doclose, int dofill, int dostroke, int evenodd)
 	if (doclose)
 		fz_closepath(path);
 
+	if (dostroke)
+		bbox = fz_boundpath(path, &gstate->strokestate, gstate->ctm);
+	else
+		bbox = fz_boundpath(path, nil, gstate->ctm);
+
 	if (csi->clip)
 	{
 		gstate->clipdepth++;
@@ -314,13 +362,7 @@ pdf_showpath(pdf_csi *csi, int doclose, int dofill, int dostroke, int evenodd)
 		csi->clip = 0;
 	}
 
-	if (dostroke)
-		bbox = fz_boundpath(path, &gstate->strokestate, gstate->ctm);
-	else
-		bbox = fz_boundpath(path, nil, gstate->ctm);
-
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->begingroup(csi->dev->user, bbox, 0, 0, gstate->blendmode, 1);
+	pdf_begingroup(csi, bbox);
 
 	if (dofill)
 	{
@@ -380,8 +422,7 @@ pdf_showpath(pdf_csi *csi, int doclose, int dofill, int dostroke, int evenodd)
 		}
 	}
 
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->endgroup(csi->dev->user);
+	pdf_endgroup(csi);
 
 	fz_freepath(path);
 }
@@ -417,8 +458,7 @@ pdf_flushtext(pdf_csi *csi)
 
 	bbox = fz_boundtext(text, gstate->ctm);
 
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->begingroup(csi->dev->user, bbox, 0, 0, gstate->blendmode, 1);
+	pdf_begingroup(csi, bbox);
 
 	if (doinvisible)
 		csi->dev->ignoretext(csi->dev->user, text, gstate->ctm);
@@ -488,8 +528,7 @@ pdf_flushtext(pdf_csi *csi)
 		}
 	}
 
-	if (gstate->blendmode != FZ_BNORMAL)
-		csi->dev->endgroup(csi->dev->user);
+	pdf_endgroup(csi);
 
 	fz_freetext(text);
 }
diff --git a/mupdf/pdf_interpret.c b/mupdf/pdf_interpret.c
index 6bbaff57..f4d28f9f 100644
--- a/mupdf/pdf_interpret.c
+++ b/mupdf/pdf_interpret.c
@@ -168,7 +168,8 @@ pdf_runxobject(pdf_csi *csi, fz_obj *resources, pdf_xobject *xobj)
 			gstate->softmask = nil;
 			popmask = 1;
 
-			csi->dev->beginmask(csi->dev->user, bbox, gstate->luminosity, softmask->colorspace, gstate->softmaskbc);
+			csi->dev->beginmask(csi->dev->user, bbox, gstate->luminosity,
+				softmask->colorspace, gstate->softmaskbc);
 			error = pdf_runxobject(csi, resources, softmask);
 			if (error)
 				return fz_rethrow(error, "cannot run softmask");
-- 
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