| 213 | |
| 214 | template <class DataType, class EqualityTest> |
| 215 | bool GDALRasterPolygonEnumeratorT<DataType, EqualityTest>::ProcessLine( |
| 216 | DataType *panLastLineVal, DataType *panThisLineVal, GInt32 *panLastLineId, |
| 217 | GInt32 *panThisLineId, int nXSize) |
| 218 | |
| 219 | { |
| 220 | EqualityTest eq; |
| 221 | |
| 222 | /* -------------------------------------------------------------------- */ |
| 223 | /* Special case for the first line. */ |
| 224 | /* -------------------------------------------------------------------- */ |
| 225 | if (panLastLineVal == nullptr) |
| 226 | { |
| 227 | for (int i = 0; i < nXSize; i++) |
| 228 | { |
| 229 | if (panThisLineVal[i] == GP_NODATA_MARKER) |
| 230 | { |
| 231 | panThisLineId[i] = -1; |
| 232 | } |
| 233 | else if (i == 0 || |
| 234 | !(eq.operator()(panThisLineVal[i], panThisLineVal[i - 1]))) |
| 235 | { |
| 236 | panThisLineId[i] = NewPolygon(panThisLineVal[i]); |
| 237 | if (panThisLineId[i] < 0) |
| 238 | return false; |
| 239 | } |
| 240 | else |
| 241 | { |
| 242 | panThisLineId[i] = panThisLineId[i - 1]; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | return true; |
| 247 | } |
| 248 | |
| 249 | /* -------------------------------------------------------------------- */ |
| 250 | /* Process each pixel comparing to the previous pixel, and to */ |
| 251 | /* the last line. */ |
| 252 | /* -------------------------------------------------------------------- */ |
| 253 | for (int i = 0; i < nXSize; i++) |
| 254 | { |
| 255 | if (panThisLineVal[i] == GP_NODATA_MARKER) |
| 256 | { |
| 257 | panThisLineId[i] = -1; |
| 258 | } |
| 259 | else if (i > 0 && |
| 260 | eq.operator()(panThisLineVal[i], panThisLineVal[i - 1])) |
| 261 | { |
| 262 | panThisLineId[i] = panThisLineId[i - 1]; |
| 263 | |
| 264 | if (eq.operator()(panLastLineVal[i], panThisLineVal[i]) && |
| 265 | (panPolyIdMap[panLastLineId[i]] != |
| 266 | panPolyIdMap[panThisLineId[i]])) |
| 267 | { |
| 268 | MergePolygon(panLastLineId[i], panThisLineId[i]); |
| 269 | } |
| 270 | |
| 271 | if (nConnectedness == 8 && |
| 272 | eq.operator()(panLastLineVal[i - 1], panThisLineVal[i]) && |
no test coverage detected