[depthMap][imageIO] ensure range is not null when normalizing depth

Author: yann-lty

src/depthMapEntity/DepthMapEntity.cpp

@@ -328,7 +328,8 @@ void DepthMapEntity::loadDepthMap()
             }
             else
             {
-                float normalizedDepthValue = (depthValue - stats.min[0]) / (stats.max[0] - stats.min[0]);
+                const float range = stats.max[0] - stats.min[0];
+                float normalizedDepthValue = range != 0.0f ? (depthValue - stats.min[0]) / range : 1.0f;
                 Color32f color = getColor32fFromJetColorMapClamp(normalizedDepthValue);
                 colors.push_back(color);
             }

src/imageIOHandler/QtOIIOHandler.cpp

@@ -216,7 +216,8 @@ bool QtOIIOHandler::read(QImage *image)
                 {
                     float depthValue = 0.0f;
                     inBuf.getpixel(x, y, &depthValue, 1);
-                    float normalizedDepthValue = (depthValue - stats.min[0]) / (stats.max[0] - stats.min[0]);
+                    const float range = stats.max[0] - stats.min[0];
+                    const float normalizedDepthValue = range != 0.0f ? (depthValue - stats.min[0]) / range : 1.0f;
                     Color32f color;
                     if(isDepthMap)
                         color = getColor32fFromJetColorMap(normalizedDepthValue);