From 60a57ea87f74a6457cbdbc85348d4e4af68df569 Mon Sep 17 00:00:00 2001
From: Robin Watts <robin.watts@artifex.com>
Date: Wed, 1 Apr 2015 19:48:49 +0100
Subject: Antidropout followup: cope with stroking too.

Stroke segments that are horizontal or vertical get the same
antidropout treatment as filled rectangles.
---
 source/fitz/draw-path.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 65 insertions(+), 2 deletions(-)

(limited to 'source/fitz/draw-path.c')

diff --git a/source/fitz/draw-path.c b/source/fitz/draw-path.c
index 2c0caa50..9956ff45 100644
--- a/source/fitz/draw-path.c
+++ b/source/fitz/draw-path.c
@@ -268,6 +268,58 @@ fz_add_line(fz_context *ctx, sctx *s, float x0, float y0, float x1, float y1)
 	fz_insert_gel(ctx, s->gel, tx0, ty0, tx1, ty1);
 }
 
+static void
+fz_add_horiz_rect(fz_context *ctx, sctx *s, float x0, float y0, float x1, float y1)
+{
+	if (s->ctm->b == 0 && s->ctm->c == 0)
+	{
+		float tx0 = s->ctm->a * x0 + s->ctm->e;
+		float ty0 = s->ctm->d * y0 + s->ctm->f;
+		float tx1 = s->ctm->a * x1 + s->ctm->e;
+		float ty1 = s->ctm->d * y1 + s->ctm->f;
+		fz_insert_gel_rect(ctx, s->gel, tx1, ty1, tx0, ty0);
+	}
+	else if (s->ctm->a == 0 && s->ctm->d == 0)
+	{
+		float tx0 = s->ctm->c * y0 + s->ctm->e;
+		float ty0 = s->ctm->b * x0 + s->ctm->f;
+		float tx1 = s->ctm->c * y1 + s->ctm->e;
+		float ty1 = s->ctm->b * x1 + s->ctm->f;
+		fz_insert_gel_rect(ctx, s->gel, tx1, ty0, tx0, ty1);
+	}
+	else
+	{
+		fz_add_line(ctx, s, x0, y0, x1, y0);
+		fz_add_line(ctx, s, x1, y1, x0, y1);
+	}
+}
+
+static void
+fz_add_vert_rect(fz_context *ctx, sctx *s, float x0, float y0, float x1, float y1)
+{
+	if (s->ctm->b == 0 && s->ctm->c == 0)
+	{
+		float tx0 = s->ctm->a * x0 + s->ctm->e;
+		float ty0 = s->ctm->d * y0 + s->ctm->f;
+		float tx1 = s->ctm->a * x1 + s->ctm->e;
+		float ty1 = s->ctm->d * y1 + s->ctm->f;
+		fz_insert_gel_rect(ctx, s->gel, tx0, ty1, tx1, ty0);
+	}
+	else if (s->ctm->a == 0 && s->ctm->d == 0)
+	{
+		float tx0 = s->ctm->c * y0 + s->ctm->e;
+		float ty0 = s->ctm->b * x0 + s->ctm->f;
+		float tx1 = s->ctm->c * y1 + s->ctm->e;
+		float ty1 = s->ctm->b * x1 + s->ctm->f;
+		fz_insert_gel_rect(ctx, s->gel, tx0, ty0, tx1, ty1);
+	}
+	else
+	{
+		fz_add_line(ctx, s, x1, y0, x0, y0);
+		fz_add_line(ctx, s, x0, y1, x1, y1);
+	}
+}
+
 static void
 fz_add_arc(fz_context *ctx, sctx *s,
 	float xc, float yc,
@@ -321,8 +373,19 @@ fz_add_line_stroke(fz_context *ctx, sctx *s, float ax, float ay, float bx, float
 	float dlx = dy * scale;
 	float dly = -dx * scale;
 
-	fz_add_line(ctx, s, ax - dlx, ay - dly, bx - dlx, by - dly);
-	fz_add_line(ctx, s, bx + dlx, by + dly, ax + dlx, ay + dly);
+	if (0 && dx == 0)
+	{
+		fz_add_vert_rect(ctx, s, ax - dlx, ay, bx + dlx, by);
+	}
+	else if (dy == 0)
+	{
+		fz_add_horiz_rect(ctx, s, ax, ay - dly, bx, by + dly);
+	}
+	else
+	{
+		fz_add_line(ctx, s, ax - dlx, ay - dly, bx - dlx, by - dly);
+		fz_add_line(ctx, s, bx + dlx, by + dly, ax + dlx, ay + dly);
+	}
 }
 
 static void
-- 
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