From 6444204a8cdc07e01ee63f843e8ef6f89f37c85d Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Mon, 19 Oct 2015 11:50:13 +0200
Subject: Fix 695582: add knockout group for text that is both stroke and fill.

---
 source/pdf/pdf-op-run.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'source')

diff --git a/source/pdf/pdf-op-run.c b/source/pdf/pdf-op-run.c
index faed37a5..dbd9386d 100644
--- a/source/pdf/pdf-op-run.c
+++ b/source/pdf/pdf-op-run.c
@@ -722,6 +722,7 @@ pdf_flush_text(fz_context *ctx, pdf_run_processor *pr)
 	int doclip;
 	int doinvisible;
 	softmask_save softmask = { NULL };
+	int knockout_group = 0;
 
 	if (!pr->text)
 		return gstate;
@@ -749,6 +750,8 @@ pdf_flush_text(fz_context *ctx, pdf_run_processor *pr)
 		fz_rect tb = pr->text_bbox;
 
 		fz_transform_rect(&tb, &gstate->ctm);
+		if (dostroke)
+			fz_adjust_rect_for_stroke(ctx, &tb, gstate->stroke_state, &gstate->ctm);
 
 		/* Don't bother sending a text group with nothing in it */
 		if (text->len == 0)
@@ -757,6 +760,24 @@ pdf_flush_text(fz_context *ctx, pdf_run_processor *pr)
 		if (dofill || dostroke)
 			gstate = pdf_begin_group(ctx, pr, &tb, &softmask);
 
+		if (dofill && dostroke)
+		{
+			/* We may need to push a knockout group */
+			if (gstate->stroke.alpha == 0)
+			{
+				/* No need for group, as stroke won't do anything */
+			}
+			else if (gstate->stroke.alpha == 1.0f && gstate->blendmode == FZ_BLEND_NORMAL)
+			{
+				/* No need for group, as stroke won't show up */
+			}
+			else
+			{
+				knockout_group = 1;
+				fz_begin_group(ctx, pr->dev, &tb, 0, 1, FZ_BLEND_NORMAL, 1);
+			}
+		}
+
 		if (doinvisible)
 			fz_ignore_text(ctx, pr->dev, text, &gstate->ctm);
 
@@ -819,6 +840,9 @@ pdf_flush_text(fz_context *ctx, pdf_run_processor *pr)
 			}
 		}
 
+		if (knockout_group)
+			fz_end_group(ctx, pr->dev);
+
 		if (dofill || dostroke)
 			pdf_end_group(ctx, pr, &softmask);
 
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