From 7340ec1d3602556a05e6d2e390f3b0e3f16246d9 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Thu, 7 Jul 2016 15:45:33 +0200
Subject: Slim pdf_xobject: remove cached transparency/isolated/knockout
 fields.

---
 source/pdf/pdf-op-run.c  | 11 ++++++++---
 source/pdf/pdf-xobject.c | 40 +++++++++++++++++++++++++---------------
 2 files changed, 33 insertions(+), 18 deletions(-)

(limited to 'source/pdf')

diff --git a/source/pdf/pdf-op-run.c b/source/pdf/pdf-op-run.c
index a2b9e35c..02005b57 100644
--- a/source/pdf/pdf-op-run.c
+++ b/source/pdf/pdf-op-run.c
@@ -1222,6 +1222,7 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
 	pdf_obj *resources;
 	fz_rect xobj_bbox;
 	fz_matrix xobj_matrix;
+	int transparency;
 
 	/* Avoid infinite recursion */
 	if (xobj == NULL || pdf_mark_obj(ctx, xobj->obj))
@@ -1229,6 +1230,7 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
 
 	pdf_xobject_bbox(ctx, xobj, &xobj_bbox);
 	pdf_xobject_matrix(ctx, xobj, &xobj_matrix);
+	transparency = pdf_xobject_transparency(ctx, xobj);
 
 	fz_var(cleanup_state);
 	fz_var(gstate);
@@ -1253,7 +1255,7 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
 		pr->gstate[pr->gparent].ctm = gstate->ctm;
 
 		/* apply soft mask, create transparency group and reset state */
-		if (xobj->transparency)
+		if (transparency)
 		{
 			fz_rect bbox;
 			bbox = xobj_bbox;
@@ -1267,7 +1269,10 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
 			/* Remember that we tried to call fz_begin_group. Even
 			 * if it throws an error, we must call fz_end_group. */
 			cleanup_state = 2;
-			fz_begin_group(ctx, pr->dev, &bbox, xobj->isolated, xobj->knockout, gstate->blendmode, gstate->fill.alpha);
+			fz_begin_group(ctx, pr->dev, &bbox,
+					pdf_xobject_isolated(ctx, xobj),
+					pdf_xobject_knockout(ctx, xobj),
+					gstate->blendmode, gstate->fill.alpha);
 
 			gstate->blendmode = 0;
 			gstate->stroke.alpha = 1;
@@ -1302,7 +1307,7 @@ pdf_run_xobject(fz_context *ctx, pdf_run_processor *proc, pdf_xobject *xobj, pdf
 			pdf_grestore(ctx, pr); /* Remove the clippath */
 
 		/* wrap up transparency stacks */
-		if (xobj->transparency)
+		if (transparency)
 		{
 			if (cleanup_state >= 2)
 			{
diff --git a/source/pdf/pdf-xobject.c b/source/pdf/pdf-xobject.c
index e921f47f..7eb4552f 100644
--- a/source/pdf/pdf-xobject.c
+++ b/source/pdf/pdf-xobject.c
@@ -49,6 +49,31 @@ pdf_xobject_matrix(fz_context *ctx, pdf_xobject *xobj, fz_matrix *matrix)
 	return pdf_to_matrix(ctx, pdf_dict_get(ctx, xobj->obj, PDF_NAME_Matrix), matrix);
 }
 
+int pdf_xobject_isolated(fz_context *ctx, pdf_xobject *xobj)
+{
+	pdf_obj *group = pdf_dict_get(ctx, xobj->obj, PDF_NAME_Group);
+	if (group)
+		return pdf_to_bool(ctx, pdf_dict_get(ctx, group, PDF_NAME_I));
+	return 0;
+}
+
+int pdf_xobject_knockout(fz_context *ctx, pdf_xobject *xobj)
+{
+	pdf_obj *group = pdf_dict_get(ctx, xobj->obj, PDF_NAME_Group);
+	if (group)
+		return pdf_to_bool(ctx, pdf_dict_get(ctx, group, PDF_NAME_K));
+	return 0;
+}
+
+int pdf_xobject_transparency(fz_context *ctx, pdf_xobject *xobj)
+{
+	pdf_obj *group = pdf_dict_get(ctx, xobj->obj, PDF_NAME_Group);
+	if (group)
+		if (pdf_name_eq(ctx, pdf_dict_get(ctx, group, PDF_NAME_S), PDF_NAME_Transparency))
+			return 1;
+	return 0;
+}
+
 pdf_xobject *
 pdf_load_xobject(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
 {
@@ -72,22 +97,11 @@ pdf_load_xobject(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
 
 	fz_try(ctx)
 	{
-		form->isolated = 0;
-		form->knockout = 0;
-		form->transparency = 0;
-
 		obj = pdf_dict_get(ctx, dict, PDF_NAME_Group);
 		if (obj)
 		{
 			pdf_obj *attrs = obj;
 
-			form->isolated = pdf_to_bool(ctx, pdf_dict_get(ctx, attrs, PDF_NAME_I));
-			form->knockout = pdf_to_bool(ctx, pdf_dict_get(ctx, attrs, PDF_NAME_K));
-
-			obj = pdf_dict_get(ctx, attrs, PDF_NAME_S);
-			if (pdf_name_eq(ctx, obj, PDF_NAME_Transparency))
-				form->transparency = 1;
-
 			obj = pdf_dict_get(ctx, attrs, PDF_NAME_CS);
 			if (obj)
 			{
@@ -155,10 +169,6 @@ pdf_new_xobject(fz_context *ctx, pdf_document *doc, const fz_rect *bbox, const f
 		form->obj = NULL;
 		form->iteration = 0;
 
-		form->isolated = 0;
-		form->knockout = 0;
-		form->transparency = 0;
-
 		idict_num = pdf_create_object(ctx, doc);
 		pdf_update_object(ctx, doc, idict_num, dict);
 		idict = pdf_new_indirect(ctx, doc, idict_num, 0);
-- 
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