Fix reprojection of raster sources with gutter

src/ol/renderer/canvas/canvastilelayerrenderer.js

@@ -67,7 +67,7 @@ ol.renderer.canvas.TileLayer.prototype.composeFrame = function(
   var source = layer.getSource();
   goog.asserts.assertInstanceof(source, ol.source.Tile,
       'source is an ol.source.Tile');
-  var tileGutter = source.getGutter();
+  var tileGutter = source.getGutter(projection);
   var opaque = source.getOpaque(projection);
 
   var transform = this.getTransform(frameState, 0);

src/ol/renderer/dom/domtilelayerrenderer.js

@@ -94,7 +94,7 @@ ol.renderer.dom.TileLayer.prototype.prepareFrame = function(frameState, layerSta
       'layer is an instance of ol.layer.Tile');
   var tileSource = tileLayer.getSource();
   var tileGrid = tileSource.getTileGridForProjection(projection);
-  var tileGutter = tileSource.getGutter();
+  var tileGutter = tileSource.getGutter(projection);
   var z = tileGrid.getZForResolution(viewState.resolution);
   var tileResolution = tileGrid.getResolution(z);
   var center = viewState.center;

src/ol/renderer/webgl/webgltilelayerrenderer.js

@@ -169,7 +169,7 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame = function(frameState, layerS
   var pixelRatio = tilePixelSize[0] /
       ol.size.toSize(tileGrid.getTileSize(z), this.tmpSize_)[0];
   var tilePixelResolution = tileResolution / pixelRatio;
-  var tileGutter = tileSource.getGutter();
+  var tileGutter = tileSource.getGutter(projection);
 
   var center = viewState.center;
   var extent;

src/ol/reproj/image.js

@@ -163,7 +163,7 @@ ol.reproj.Image.prototype.reproject_ = function() {
         this.targetResolution_, this.targetExtent_, this.triangulation_, [{
           extent: this.sourceImage_.getExtent(),
           image: this.sourceImage_.getImage()
-        }]);
+        }], 0);
   }
   this.state = sourceState;
   this.changed();

src/ol/reproj/reproj.js

@@ -101,12 +101,13 @@ ol.reproj.enlargeClipPoint_ = function(centroidX, centroidY, x, y) {
  * @param {Array.<{extent: ol.Extent,
  *                 image: (HTMLCanvasElement|Image|HTMLVideoElement)}>} sources
  *             Array of sources.
+ * @param {number} gutter Gutter of the sources.
  * @param {boolean=} opt_renderEdges Render reprojection edges.
  * @return {HTMLCanvasElement} Canvas with reprojected data.
  */
 ol.reproj.render = function(width, height, pixelRatio,
     sourceResolution, sourceExtent, targetResolution, targetExtent,
-    triangulation, sources, opt_renderEdges) {
+    triangulation, sources, gutter, opt_renderEdges) {
 
   var context = ol.dom.createCanvasContext2D(Math.round(pixelRatio * width),
                                              Math.round(pixelRatio * height));
@@ -136,9 +137,12 @@ ol.reproj.render = function(width, height, pixelRatio,
     var srcWidth = ol.extent.getWidth(src.extent);
     var srcHeight = ol.extent.getHeight(src.extent);
 
-    stitchContext.drawImage(src.image,
-                            xPos * stitchScale, yPos * stitchScale,
-                            srcWidth * stitchScale, srcHeight * stitchScale);
+    stitchContext.drawImage(
+        src.image,
+        gutter, gutter,
+        src.image.width - 2 * gutter, src.image.height - 2 * gutter,
+        xPos * stitchScale, yPos * stitchScale,
+        srcWidth * stitchScale, srcHeight * stitchScale);
   });
 
   var targetTopLeft = ol.extent.getTopLeft(targetExtent);

src/ol/reproj/tile.js

@@ -35,6 +35,7 @@ ol.reproj.TileFunctionType;
  * @param {ol.TileCoord} tileCoord Coordinate of the tile.
  * @param {ol.TileCoord} wrappedTileCoord Coordinate of the tile wrapped in X.
  * @param {number} pixelRatio Pixel ratio.
+ * @param {number} gutter Gutter of the source tiles.
  * @param {ol.reproj.TileFunctionType} getTileFunction
  *     Function returning source tiles (z, x, y, pixelRatio).
  * @param {number=} opt_errorThreshold Acceptable reprojection error (in px).
@@ -42,7 +43,7 @@ ol.reproj.TileFunctionType;
  */
 ol.reproj.Tile = function(sourceProj, sourceTileGrid,
     targetProj, targetTileGrid, tileCoord, wrappedTileCoord,
-    pixelRatio, getTileFunction,
+    pixelRatio, gutter, getTileFunction,
     opt_errorThreshold,
     opt_renderEdges) {
   goog.base(this, tileCoord, ol.TileState.IDLE);
@@ -59,6 +60,12 @@ ol.reproj.Tile = function(sourceProj, sourceTileGrid,
    */
   this.pixelRatio_ = pixelRatio;
 
+  /**
+   * @private
+   * @type {number}
+   */
+  this.gutter_ = gutter;
+
   /**
    * @private
    * @type {HTMLCanvasElement}
@@ -269,7 +276,7 @@ ol.reproj.Tile.prototype.reproject_ = function() {
     this.canvas_ = ol.reproj.render(width, height, this.pixelRatio_,
         sourceResolution, this.sourceTileGrid_.getExtent(),
         targetResolution, targetExtent, this.triangulation_, sources,
-        this.renderEdges_);
+        this.gutter_, this.renderEdges_);
 
     this.state = ol.TileState.LOADED;
   }

src/ol/source/tileimagesource.js

@@ -120,6 +120,29 @@ ol.source.TileImage.prototype.expireCache = function(projection, usedTiles) {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.source.TileImage.prototype.getGutter = function(projection) {
+  if (ol.ENABLE_RASTER_REPROJECTION &&
+      this.getProjection() && projection &&
+      !ol.proj.equivalent(this.getProjection(), projection)) {
+    return 0;
+  } else {
+    return this.getGutterInternal();
+  }
+};
+
+
+/**
+ * @protected
+ * @return {number} Gutter.
+ */
+ol.source.TileImage.prototype.getGutterInternal = function() {
+  return 0;
+};
+
+
 /**
  * @inheritDoc
  */
@@ -230,6 +253,7 @@ ol.source.TileImage.prototype.getTile = function(z, x, y, pixelRatio, projection
           sourceProjection, sourceTileGrid,
           projection, targetTileGrid,
           tileCoord, wrappedTileCoord, this.getTilePixelRatio(pixelRatio),
+          this.getGutterInternal(),
           function(z, x, y, pixelRatio) {
             return this.getTileInternal(z, x, y, pixelRatio, sourceProjection);
           }.bind(this), this.reprojectionErrorThreshold_,

src/ol/source/tilesource.js

@@ -147,9 +147,10 @@ ol.source.Tile.prototype.forEachLoadedTile = function(projection, z, tileRange,
 
 
 /**
+ * @param {ol.proj.Projection} projection Projection.
  * @return {number} Gutter.
  */
-ol.source.Tile.prototype.getGutter = function() {
+ol.source.Tile.prototype.getGutter = function(projection) {
   return 0;
 };
 

src/ol/source/tilewmssource.js

@@ -177,7 +177,7 @@ ol.source.TileWMS.prototype.getGetFeatureInfoUrl = function(coordinate, resoluti
 /**
  * @inheritDoc
  */
-ol.source.TileWMS.prototype.getGutter = function() {
+ol.source.TileWMS.prototype.getGutterInternal = function() {
   return this.gutter_;
 };