From 466febd615a9d58994ec851aa57c794947e09f11 Mon Sep 17 00:00:00 2001
From: Ansis Brammanis <brammanis@gmail.com>
Date: Thu, 2 Apr 2015 16:48:43 -0700
Subject: [PATCH] don't create infinitely many boxes for zero or negative
 height symbols

line-height or padding can make the height of a shaped object <= 0.
In these cases either create no boxes, or create boxes with a minimum
height to avoid creating too many of them.

-js: 9e78c02d8b22b60a08fdb28fd29eef1642f62d94
---
 src/mbgl/text/collision_feature.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/mbgl/text/collision_feature.cpp b/src/mbgl/text/collision_feature.cpp
index f44e48c35..181875139 100644
--- a/src/mbgl/text/collision_feature.cpp
+++ b/src/mbgl/text/collision_feature.cpp
@@ -15,9 +15,13 @@ CollisionFeature::CollisionFeature(const std::vector<Coordinate> &line, const An
     const float x2 = right * boxScale + padding;
 
     if (alongLine) {
-        const float height = y2 - y1;
+        float height = y2 - y1;
         const float length = x2 - x1;
 
+        if (height <= 0.0f) return;
+
+        height = std::max(10.0f * boxScale, height);
+
         bboxifyLabel(line, anchor, length, height);
     } else {
         boxes.emplace_back(anchor, x1, y1, x2, y2, std::numeric_limits<float>::infinity());