From c88fa306d0b23403aa70ada5a2f03817b85c5d7a Mon Sep 17 00:00:00 2001
From: Robin Watts <robin.watts@artifex.com>
Date: Thu, 10 Nov 2016 10:23:41 +0000
Subject: Add minimum line width configuration option.

---
 include/mupdf/fitz/context.h | 16 ++++++++++++++++
 source/fitz/draw-device.c    |  6 ++++++
 source/fitz/draw-edge.c      | 19 +++++++++++++++++++
 3 files changed, 41 insertions(+)

diff --git a/include/mupdf/fitz/context.h b/include/mupdf/fitz/context.h
index 47aa8fa5..c84629e4 100644
--- a/include/mupdf/fitz/context.h
+++ b/include/mupdf/fitz/context.h
@@ -322,6 +322,22 @@ int fz_graphics_aa_level(fz_context *ctx);
 */
 void fz_set_graphics_aa_level(fz_context *ctx, int bits);
 
+/*
+	fz_graphics_min_line_width: Get the minimum line width to be
+	used for stroked lines.
+
+	min_line_width: The minimum line width to use (in pixels).
+*/
+float fz_graphics_min_line_width(fz_context *ctx);
+
+/*
+	fz_set_graphics_min_line_width: Set the minimum line width to be
+	used for stroked lines.
+
+	min_line_width: The minimum line width to use (in pixels).
+*/
+void fz_set_graphics_min_line_width(fz_context *ctx, float min_line_width);
+
 /*
 	fz_user_css: Get the user stylesheet source text.
 */
diff --git a/source/fitz/draw-device.c b/source/fitz/draw-device.c
index d6d17782..d6d8c38e 100644
--- a/source/fitz/draw-device.c
+++ b/source/fitz/draw-device.c
@@ -350,10 +350,13 @@ fz_draw_stroke_path(fz_context *ctx, fz_device *devp, const fz_path *path, const
 	float aa_level = 2.0f/(fz_graphics_aa_level(ctx)+2);
 	fz_draw_state *state = &dev->stack[dev->top];
 	fz_colorspace *model = state->dest->colorspace;
+	float mlw = fz_graphics_min_line_width(ctx);
 
 	if (colorspace == NULL && model != NULL)
 		fz_throw(ctx, FZ_ERROR_GENERIC, "color destination requires source color");
 
+	if (mlw > aa_level)
+		aa_level = mlw;
 	if (linewidth * expansion < aa_level)
 		linewidth = aa_level / expansion;
 	if (flatness < 0.001f)
@@ -500,7 +503,10 @@ fz_draw_clip_stroke_path(fz_context *ctx, fz_device *devp, const fz_path *path,
 	fz_draw_state *state = &dev->stack[dev->top];
 	fz_colorspace *model;
 	float aa_level = 2.0f/(fz_graphics_aa_level(ctx)+2);
+	float mlw = fz_graphics_min_line_width(ctx);
 
+	if (mlw > aa_level)
+		aa_level = mlw;
 	if (linewidth * expansion < aa_level)
 		linewidth = aa_level / expansion;
 	if (flatness < 0.001f)
diff --git a/source/fitz/draw-edge.c b/source/fitz/draw-edge.c
index 0da45331..4465d90a 100644
--- a/source/fitz/draw-edge.c
+++ b/source/fitz/draw-edge.c
@@ -23,6 +23,7 @@ struct fz_aa_context_s
 	int scale;
 	int bits;
 	int text_bits;
+	float min_line_width;
 };
 
 void fz_new_aa_context(fz_context *ctx)
@@ -205,6 +206,24 @@ fz_set_graphics_aa_level(fz_context *ctx, int level)
 #endif
 }
 
+void
+fz_set_graphics_min_line_width(fz_context *ctx, float min_line_width)
+{
+	if (!ctx || !ctx->aa)
+		return;
+
+	ctx->aa->min_line_width = min_line_width;
+}
+
+float
+fz_graphics_min_line_width(fz_context *ctx)
+{
+	if (!ctx || !ctx->aa)
+		return 0;
+
+	return ctx->aa->min_line_width;
+}
+
 /*
  * Global Edge List -- list of straight path segments for scan conversion
  *
-- 
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