Support Group Layer in psd (#648)

(cherry picked from commit dc0bdcbd5bb2506ef69262126fb6e5830d5e9e4c)

imageio/imageio-psd/src/main/java/com/twelvemonkeys/imageio/plugins/psd/PSD.java

@@ -708,4 +708,5 @@ interface PSD extends com.twelvemonkeys.imageio.metadata.psd.PSD {
     int PxSD = 'P' << 24 | 'x' << 16 | 'S' << 8 | 'D';
     int luni = 'l' << 24 | 'u' << 16 | 'n' << 8 | 'i';
     int lyid = 'l' << 24 | 'y' << 16 | 'i' << 8 | 'd';
+    int lsct = 'l' << 24 | 's' << 16 | 'c' << 8 | 't';
 }

imageio/imageio-psd/src/main/java/com/twelvemonkeys/imageio/plugins/psd/PSDImageReader.java

@@ -947,8 +947,42 @@ public final class PSDImageReader extends ImageReaderBase {
 
                     if (pParseData && metadata.layerInfo == null) {
                         PSDLayerInfo[] layerInfos = new PSDLayerInfo[Math.abs(layerCount)];
+
+                        Stack<List<PSDLayerInfo>> groupStack = new Stack<>();
+                        List<PSDLayerInfo> groupedLayerInfo = null;
+
                         for (int i = 0; i < layerInfos.length; i++) {
-                            layerInfos[i] = new PSDLayerInfo(header.largeFormat, imageInput);
+                            PSDLayerInfo layerInfo = new PSDLayerInfo(header.largeFormat, imageInput);
+                            layerInfos[i] = layerInfo;
+
+                            if (layerInfo.sectionDividerSettingType == PSDLayerInfo.SectionDividerSetting.BOUNDING_SECTION_DIVIDER) {
+                                if (groupedLayerInfo == null) {
+                                    groupedLayerInfo = new LinkedList<>();
+                                    groupStack.add(groupedLayerInfo);
+                                } else {
+                                    groupStack.add(groupedLayerInfo);
+                                    groupedLayerInfo = new LinkedList<>();
+                                }
+                                layerInfo.sectionDivider = true;
+                            }
+                            else if (layerInfo.sectionDividerSettingType == PSDLayerInfo.SectionDividerSetting.OPEN_FOLDER ||
+                                    layerInfo.sectionDividerSettingType == PSDLayerInfo.SectionDividerSetting.CLOSED_FOLDER) {
+                                // can't happen but for defense logic
+                                if (groupedLayerInfo == null) {
+                                    continue;
+                                }
+                                for (PSDLayerInfo info : groupedLayerInfo) {
+                                    info.groupLayerId = layerInfo.getLayerId();
+                                }
+                                groupedLayerInfo = groupStack.pop();
+                                groupedLayerInfo.add(layerInfo);
+                                layerInfo.group = true;
+                            }
+                            else {
+                                if (groupedLayerInfo != null) {
+                                    groupedLayerInfo.add(layerInfo);
+                                }
+                            }
                         }
 
                         metadata.layerInfo = Arrays.asList(layerInfos);

imageio/imageio-psd/src/main/java/com/twelvemonkeys/imageio/plugins/psd/PSDLayerInfo.java

@@ -57,6 +57,12 @@ final class PSDLayerInfo {
     private String unicodeLayerName;
     private int layerId;
 
+    Integer groupLayerId;
+    Boolean group = false;
+    Boolean sectionDivider = false;
+
+    SectionDividerSetting sectionDividerSettingType;
+
     PSDLayerInfo(final boolean largeFormat, final ImageInputStream pInput) throws IOException {
         top = pInput.readInt();
         left = pInput.readInt();
@@ -132,6 +138,7 @@ final class PSDLayerInfo {
 //            System.out.println("key: " + PSDUtil.intToStr(resourceKey));
 //            System.out.println("length: " + resourceLength);
 
+
             switch (resourceKey) {
                 case PSD.luni:
                     unicodeLayerName = PSDUtil.readUnicodeString(pInput);
@@ -144,7 +151,10 @@ final class PSDLayerInfo {
                     }
                     layerId = pInput.readInt();
                     break;
-
+                case PSD.lsct:
+                    sectionDividerSettingType = SectionDividerSetting.valueOf(pInput.readInt());
+                    pInput.skipBytes(resourceLength - 4);
+                    break;
                 default:
                     // TODO: Parse more data...
                     pInput.skipBytes(resourceLength);
@@ -191,4 +201,22 @@ final class PSDLayerInfo {
         builder.append("]");
         return builder.toString();
     }
+
+    public enum SectionDividerSetting {
+        LAYER(0), OPEN_FOLDER(1), CLOSED_FOLDER(2), BOUNDING_SECTION_DIVIDER(3);
+        SectionDividerSetting(int value) { this.value = value;}
+
+        private final int value;
+        public int value() { return value; }
+
+        public static SectionDividerSetting valueOf(int value){
+            for(SectionDividerSetting rt : SectionDividerSetting.values()){
+                if(rt.value == value){
+                    return rt;
+                }
+            }
+
+            return null;
+        }
+    }
 }

imageio/imageio-psd/src/main/java/com/twelvemonkeys/imageio/plugins/psd/PSDMetadata.java

@@ -387,12 +387,22 @@ public final class PSDMetadata extends AbstractMetadata {
             node.setAttribute("left", String.valueOf(psdLayerInfo.left));
             node.setAttribute("bottom", String.valueOf(psdLayerInfo.bottom));
             node.setAttribute("right", String.valueOf(psdLayerInfo.right));
+            node.setAttribute("layerId", String.valueOf(psdLayerInfo.getLayerId()));
+            node.setAttribute("groupLayerId", String.valueOf(psdLayerInfo.groupLayerId));
 
             node.setAttribute("blendMode", PSDUtil.intToStr(psdLayerInfo.blendMode.blendMode));
             node.setAttribute("opacity", String.valueOf(psdLayerInfo.blendMode.opacity)); // 0-255
             node.setAttribute("clipping", getClippingValue(psdLayerInfo.blendMode.clipping)); // Enum: 0: Base, 1: Non-base, n: unknown
             node.setAttribute("flags", String.valueOf(psdLayerInfo.blendMode.flags));
 
+            if ((psdLayerInfo.group)){
+                node.setAttribute("group", String.valueOf(psdLayerInfo.group));
+            }
+
+            if ((psdLayerInfo.sectionDivider)) {
+                node.setAttribute("sectionDivider", String.valueOf(psdLayerInfo.sectionDivider));
+            }
+
             if ((psdLayerInfo.blendMode.flags & 0x01) != 0) {
                 node.setAttribute("transparencyProtected", "true");
             }

imageio/imageio-psd/src/main/java/com/twelvemonkeys/imageio/plugins/psd/PSDMetadataFormat.java

@@ -247,6 +247,11 @@ public final class PSDMetadataFormat extends IIOMetadataFormatImpl {
         addAttribute("LayerInfo", "opacity", DATATYPE_INTEGER, false, "0");
         addAttribute("LayerInfo", "clipping", DATATYPE_STRING, false, "base", Arrays.asList("base", "non-base"));
         addAttribute("LayerInfo", "flags", DATATYPE_INTEGER, false, "0");
+        addAttribute("LayerInfo", "layerId", DATATYPE_INTEGER, false, null);
+        addAttribute("LayerInfo", "groupLayerId", DATATYPE_INTEGER, false, null);
+        addAttribute("LayerInfo", "group", DATATYPE_BOOLEAN, false, "false");
+        addAttribute("LayerInfo", "sectionDivider", DATATYPE_INTEGER, false, "false");
+
 
         // Redundant (derived from flags)
         addAttribute("LayerInfo", "transparencyProtected", DATATYPE_BOOLEAN, false, "false");

imageio/imageio-psd/src/test/java/com/twelvemonkeys/imageio/plugins/psd/PSDImageReaderTest.java

@@ -532,4 +532,51 @@ public class PSDImageReaderTest extends ImageReaderAbstractTest<PSDImageReader>
             assertEquals("If_The_Layer_Name_Is_Really_Long_Oh_No_What_Do_I_Do", ((IIOMetadataNode) layerInfo.item(0)).getAttribute("name"));
         }
     }
+
+    @Test
+    public void testGroupLayerRead() throws IOException {
+        PSDImageReader imageReader = createReader();
+
+        try (ImageInputStream stream = ImageIO.createImageInputStream(getClassLoaderResource("/psd/layer_group_32bit5x5.psd"))) {
+            imageReader.setInput(stream);
+
+            IIOMetadata metadata = imageReader.getImageMetadata(0);
+            List<PSDLayerInfo> layerInfos = ((PSDMetadata) metadata).layerInfo;
+
+            assertEquals(layerInfos.size(), 5);
+
+            PSDLayerInfo groupedLayer = null;
+            PSDLayerInfo groupLayer = null;
+            PSDLayerInfo sectionDividerLayer = null;
+            for (PSDLayerInfo layerInfo : layerInfos) {
+                if (layerInfo.getLayerId() == 5) {
+                    groupedLayer = layerInfo;
+                }
+
+                if (layerInfo.getLayerId() == 6) {
+                    groupLayer = layerInfo;
+                }
+
+                if (layerInfo.getLayerId() == 7) {
+                    sectionDividerLayer = layerInfo;
+                }
+            }
+
+            assertNotNull(groupedLayer);
+            assertEquals((int) groupedLayer.groupLayerId, 6);
+            assertEquals(groupedLayer.group, false);
+            assertEquals(groupedLayer.sectionDivider, false);
+
+            assertNotNull(groupLayer);
+            assertNull(groupLayer.groupLayerId);
+            assertEquals(groupLayer.group, true);
+            assertEquals(groupLayer.sectionDivider, false);
+
+            assertNotNull(sectionDividerLayer);
+            assertNull(sectionDividerLayer.groupLayerId);
+            assertEquals(sectionDividerLayer.group, false);
+            assertEquals(sectionDividerLayer.sectionDivider, true);
+
+        }
+    }
 }