From d15432548fa3a8b25d8bbce6a6b7212db10a080e Mon Sep 17 00:00:00 2001
From: "r.kuznetsov" <r.kuznetsov@corp.mail.ru>
Date: Wed, 16 Dec 2015 13:10:26 +0300
Subject: [PATCH] Fixed artefacts on fetching from symbols texture

---
 drape/font_texture.cpp           | 14 ++++++++++----
 drape_frontend/visual_params.cpp |  2 +-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drape/font_texture.cpp b/drape/font_texture.cpp
index d17f5e0646..3855f7f4dc 100644
--- a/drape/font_texture.cpp
+++ b/drape/font_texture.cpp
@@ -69,10 +69,16 @@ m2::RectF GlyphPacker::MapTextureCoords(const m2::RectU & pixelRect) const
 {
   float fWidth = static_cast<float>(m_size.x);
   float fHeight = static_cast<float>(m_size.y);
-  return m2::RectF(pixelRect.minX() / fWidth,
-                   pixelRect.minY() / fHeight,
-                   pixelRect.maxX() / fWidth,
-                   pixelRect.maxY() / fHeight);
+
+  // Half-pixel offset to eliminate arfefacts on fetching from texture.
+  float offset = 0.0;
+  if (pixelRect.SizeX() != 0 && pixelRect.SizeY() != 0)
+    offset = 0.5;
+
+  return m2::RectF((pixelRect.minX() + offset) / fWidth,
+                   (pixelRect.minY() + offset) / fHeight,
+                   (pixelRect.maxX() - offset) / fWidth,
+                   (pixelRect.maxY() - offset) / fHeight);
 }
 
 bool GlyphPacker::IsFull() const { return m_isFull; }
diff --git a/drape_frontend/visual_params.cpp b/drape_frontend/visual_params.cpp
index 7d31b28134..2ff8f0425b 100644
--- a/drape_frontend/visual_params.cpp
+++ b/drape_frontend/visual_params.cpp
@@ -44,7 +44,7 @@ void VisualParams::Init(double vs, uint32_t tileSize, vector<uint32_t> const & a
   if (vs <= 1.0)
     g_VizParams.m_glyphVisualParams = { 0.48f, 0.08f, 0.2f, 0.01f, 0.49f, 0.04f };
   else
-    g_VizParams.m_glyphVisualParams = { 0.5f, 0.05f, 0.2f, 0.01f, 0.49f, 0.04f };
+    g_VizParams.m_glyphVisualParams = { 0.5f, 0.06f, 0.2f, 0.01f, 0.49f, 0.04f };
 
   RISE_INITED;
 }