Change the way of checking transparency on the page

DEVSIX-2721

Author: ar3em

kernel/src/main/java/com/itextpdf/kernel/pdf/IsoKey.java

@@ -56,4 +56,5 @@ public enum IsoKey {
     RENDERING_INTENT,
     STROKE_COLOR,
     TAG_STRUCTURE_ELEMENT,
+    FONT_GLYPHS,
 }

kernel/src/main/java/com/itextpdf/kernel/pdf/PdfDocument.java

@@ -1425,14 +1425,28 @@ public void checkIsoConformance(Object obj, IsoKey key) {
     /**
      * Checks whether PDF document conforms a specific standard.
      * Shall be override.
+     * @deprecated This method will be replaced by {@link #checkIsoConformance(Object, IsoKey, PdfResources, PdfStream) checkIsoConformance} in  7.2 release
      *
      * @param obj       an object to conform.
      * @param key       type of object to conform.
      * @param resources {@link PdfResources} associated with an object to check.
      */
+    @Deprecated
     public void checkIsoConformance(Object obj, IsoKey key, PdfResources resources) {
     }
 
+    /**
+     * Checks whether PDF document conforms a specific standard.
+     * Shall be override.
+     *
+     * @param obj       an object to conform.
+     * @param key       type of object to conform.
+     * @param resources {@link PdfResources} associated with an object to check.
+     * @param contentStream current content stream
+     */
+    public void checkIsoConformance(Object obj, IsoKey key, PdfResources resources, PdfStream contentStream) {
+    }
+
     /**
      * Checks whether PDF document conforms a specific standard.
      * Shall be override.

kernel/src/main/java/com/itextpdf/kernel/pdf/canvas/PdfCanvas.java

@@ -721,6 +721,7 @@ public PdfCanvas showText(GlyphLine text) {
      * @return current canvas.
      */
     public PdfCanvas showText(GlyphLine text, Iterator<GlyphLine.GlyphLinePart> iterator) {
+        document.checkIsoConformance(currentGs, IsoKey.FONT_GLYPHS, null, contentStream);
         PdfFont font;
         if ((font = currentGs.getFont()) == null) {
             throw new PdfException(PdfException.FontAndSizeMustBeSetBeforeWritingAnyText, currentGs);
@@ -890,6 +891,7 @@ private float getWordSpacingAddition(Glyph glyph) {
      * @return current canvas.
      */
     public PdfCanvas showText(PdfArray textArray) {
+        document.checkIsoConformance(currentGs, IsoKey.FONT_GLYPHS, null, contentStream);
         if (currentGs.getFont() == null)
             throw new PdfException(PdfException.FontAndSizeMustBeSetBeforeWritingAnyText, currentGs);
         contentStream.getOutputStream().writeBytes(ByteUtils.getIsoBytes("["));
@@ -1643,7 +1645,7 @@ else if (colorSpace.getPdfObject().isIndirect()) {
             }
             contentStream.getOutputStream().writeFloats(colorValue).writeSpace().writeBytes(fill ? scn : SCN);
         }
-        document.checkIsoConformance(currentGs, fill ? IsoKey.FILL_COLOR : IsoKey.STROKE_COLOR, resources);
+        document.checkIsoConformance(currentGs, fill ? IsoKey.FILL_COLOR : IsoKey.STROKE_COLOR, resources, contentStream);
         return this;
     }
 
@@ -2084,7 +2086,7 @@ public PdfCanvas setExtGState(PdfExtGState extGState) {
             currentGs.updateFromExtGState(extGState, document);
         PdfName name = resources.addExtGState(extGState);
         contentStream.getOutputStream().write(name).writeSpace().writeBytes(gs);
-        document.checkIsoConformance(currentGs, IsoKey.EXTENDED_GRAPHICS_STATE);
+        document.checkIsoConformance(currentGs, IsoKey.EXTENDED_GRAPHICS_STATE, null, contentStream);
         return this;
     }
 
@@ -2237,7 +2239,7 @@ public PdfStream getContentStream() {
      * @param f            an element of the transformation matrix
      */
     protected void addInlineImage(PdfImageXObject imageXObject, float a, float b, float c, float d, float e, float f) {
-        document.checkIsoConformance(imageXObject.getPdfObject(), IsoKey.INLINE_IMAGE, resources);
+        document.checkIsoConformance(imageXObject.getPdfObject(), IsoKey.INLINE_IMAGE, resources, contentStream);
         saveState();
         concatMatrix(a, b, c, d, e, f);
         PdfOutputStream os = contentStream.getOutputStream();
@@ -2445,6 +2447,7 @@ private PdfStream ensureStreamDataIsReadyToBeProcessed(PdfStream stream) {
      * @param text the text to write.
      */
     private void showTextInt(String text) {
+        document.checkIsoConformance(currentGs, IsoKey.FONT_GLYPHS, null, contentStream);
         if (currentGs.getFont() == null)
             throw new PdfException(PdfException.FontAndSizeMustBeSetBeforeWritingAnyText, currentGs);
         currentGs.getFont().writeText(text, contentStream.getOutputStream());

pdfa/src/main/java/com/itextpdf/pdfa/PdfAConformanceException.java

@@ -110,7 +110,7 @@ public class PdfAConformanceException extends PdfException {
     public static final String IF_DEVICE_RGB_CMYK_GRAY_USED_IN_FILE_THAT_FILE_SHALL_CONTAIN_PDFA_OUTPUTINTENT_OR_DEFAULT_RGB_CMYK_GRAY_IN_USAGE_CONTEXT = "If device rgb cmyk gray used in file that file shall contain pdfa outputintent orDefaultRgb Cmyk Gray in usage context";
     public static final String IF_OUTPUTINTENTS_ARRAY_HAS_MORE_THAN_ONE_ENTRY_WITH_DESTOUTPUTPROFILE_KEY_THE_SAME_INDIRECT_OBJECT_SHALL_BE_USED_AS_THE_VALUE_OF_THAT_OBJECT = "If outputintents array has more than one entry with destoutputprofile key the same indirect object shall be used as the value of that object";
     public static final String IF_SPECIFIED_RENDERING_SHALL_BE_ONE_OF_THE_FOLLOWING_RELATIVECOLORIMETRIC_ABSOLUTECOLORIMETRIC_PERCEPTUAL_OR_SATURATION = "If specified rendering shall be one of the following relativecolorimetric absolutecolorimetric perceptual or saturation";
-    public static final String IF_THE_DOCUMENT_DOES_NOT_CONTAIN_A_PDFA_OUTPUTINTENT_TRANSPARENCY_IS_FORBIDDEN = "If the document does not contain a pdfa outputintent transparency is forbidden";
+    public static final String THE_DOCUMENT_DOES_NOT_CONTAIN_A_PDFA_OUTPUTINTENT_BUT_PAGE_CONTAINS_TRANSPARENCY_AND_DOES_NOT_CONTAIN_BLENDING_COLOR_SPACE = "If the document does not contain a OutputIntent, then page with transparency shall include the dictionary with Group key that include a CS with blending colour space";
     public static final String JPEG2000_ENUMERATED_COLOUR_SPACE_19_CIEJAB_SHALL_NOT_BE_USED = "jpeg2000 enumerated colour space 19 (CIEJab) shall not be used";
     public static final String LZWDECODE_FILTER_IS_NOT_PERMITTED = "LZWDecode filter is not permitted";
     public static final String MIME_TYPE_SHALL_BE_SPECIFIED_USING_THE_SUBTYPE_KEY_OF_THE_FILE_SPECIFICATION_STREAM_DICTIONARY = "Mime type shall be specified using the subtype key of the file specification stream dictionary";
@@ -149,7 +149,9 @@ public class PdfAConformanceException extends PdfException {
     public static final String TRANSPARENCY_IS_NOT_ALLOWED_CA_SHALL_BE_EQUAL_TO_1 = "Transparency is not allowed. CA shall be equal to 1";
     public static final String VALUE_OF_NAME_ENTRY_SHALL_BE_UNIQUE_AMONG_ALL_OPTIONAL_CONTENT_CONFIGURATION_DICTIONARIES = "Value of name entry shall be unique among all optional content configuration dictionaries";
     public static final String WIDGET_ANNOTATION_DICTIONARY_OR_FIELD_DICTIONARY_SHALL_NOT_INCLUDE_A_OR_AA_ENTRY = "Widget annotation dictionary or field dictionary shall not include a or aa entry";
-
+    
+    @Deprecated
+    public static final String IF_THE_DOCUMENT_DOES_NOT_CONTAIN_A_PDFA_OUTPUTINTENT_TRANSPARENCY_IS_FORBIDDEN = "If the document does not contain a pdfa outputintent transparency is forbidden";
     /**
      * Creates a PdfAConformanceException.
      *

pdfa/src/main/java/com/itextpdf/pdfa/PdfADocument.java

@@ -165,11 +165,17 @@ public PdfADocument(PdfReader reader, PdfWriter writer, StampingProperties prope
 
     @Override
     public void checkIsoConformance(Object obj, IsoKey key) {
-        checkIsoConformance(obj, key, null);
+        checkIsoConformance(obj, key, null, null);
     }
 
     @Override
+    @Deprecated
     public void checkIsoConformance(Object obj, IsoKey key, PdfResources resources) {
+        checkIsoConformance(obj, key, resources, null);
+    }
+
+    @Override
+    public void checkIsoConformance(Object obj, IsoKey key, PdfResources resources, PdfStream contentStream) {
         CanvasGraphicsState gState;
         PdfDictionary currentColorSpaces = null;
         if (resources != null) {
@@ -190,22 +196,25 @@ public void checkIsoConformance(Object obj, IsoKey key, PdfResources resources)
                 break;
             case EXTENDED_GRAPHICS_STATE:
                 gState = (CanvasGraphicsState) obj;
-                checker.checkExtGState(gState);
+                checker.checkExtGState(gState, contentStream);
                 break;
             case FILL_COLOR:
                 gState = (CanvasGraphicsState) obj;
-                checker.checkColor(gState.getFillColor(), currentColorSpaces, true);
+                checker.checkColor(gState.getFillColor(), currentColorSpaces, true, contentStream);
                 break;
             case PAGE:
                 checker.checkSinglePage((PdfPage) obj);
                 break;
             case STROKE_COLOR:
                 gState = (CanvasGraphicsState) obj;
-                checker.checkColor(gState.getStrokeColor(), currentColorSpaces, false);
+                checker.checkColor(gState.getStrokeColor(), currentColorSpaces, false, contentStream);
                 break;
             case TAG_STRUCTURE_ELEMENT:
                 checker.checkTagStructureElement((PdfObject) obj);
                 break;
+            case FONT_GLYPHS:
+                checker.checkFontGlyphs(((CanvasGraphicsState) obj).getFont(), contentStream);
+                break;
         }
     }
 

pdfa/src/main/java/com/itextpdf/pdfa/checker/PdfA1Checker.java

@@ -134,6 +134,11 @@ public void checkColor(Color color, PdfDictionary currentColorSpaces, Boolean fi
         checkColorSpace(color.getColorSpace(), currentColorSpaces, true, fill);
     }
 
+    @Override
+    public void checkColor(Color color, PdfDictionary currentColorSpaces, Boolean fill, PdfStream stream) {
+        checkColorSpace(color.getColorSpace(), currentColorSpaces, true, fill);
+    }
+
     @Override
     public void checkColorSpace(PdfColorSpace colorSpace, PdfDictionary currentColorSpaces, boolean checkAlternate, Boolean fill) {
         if (colorSpace instanceof PdfSpecialCs.Separation) {
@@ -187,6 +192,11 @@ protected void checkColorsUsages() {
 
     @Override
     public void checkExtGState(CanvasGraphicsState extGState) {
+        checkExtGState(extGState, null);
+    }
+
+    @Override
+    public void checkExtGState(CanvasGraphicsState extGState, PdfStream contentStream) {
         if (extGState.getTransferFunction() != null) {
             throw new PdfAConformanceException(PdfAConformanceException.AN_EXTGSTATE_DICTIONARY_SHALL_NOT_CONTAIN_THE_TR_KEY);
         }