pngmetadata.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

                    if (index > maxindex) {
                        maxindex = index;
                    }
                    red[index] =
                        (byte)getIntAttribute(PLTE_entry, "red");
                    green[index] =
                        (byte)getIntAttribute(PLTE_entry, "green");
                    blue[index] =
                        (byte)getIntAttribute(PLTE_entry, "blue");
                    
                    PLTE_entry = PLTE_entry.getNextSibling();
                }
                
                int numEntries = maxindex + 1;
                PLTE_red = new byte[numEntries];
                PLTE_green = new byte[numEntries];
                PLTE_blue = new byte[numEntries];
                System.arraycopy(red, 0, PLTE_red, 0, numEntries);
                System.arraycopy(green, 0, PLTE_green, 0, numEntries);
                System.arraycopy(blue, 0, PLTE_blue, 0, numEntries);
                PLTE_present = true;
            } else if (name.equals("bKGD")) {
                bKGD_present = false; // Guard against partial overwrite
                Node bKGD_node = node.getFirstChild();
                if (bKGD_node == null) {
                    fatal(node, "bKGD node has no children!");
                }
                String bKGD_name = bKGD_node.getNodeName();
                if (bKGD_name.equals("bKGD_Palette")) {
                    bKGD_index = getIntAttribute(bKGD_node, "index");
                    bKGD_colorType = PNGImageReader.PNG_COLOR_PALETTE;
                } else if (bKGD_name.equals("bKGD_Grayscale")) {
                    bKGD_gray = getIntAttribute(bKGD_node, "gray");
                    bKGD_colorType = PNGImageReader.PNG_COLOR_GRAY;
                } else if (bKGD_name.equals("bKGD_RGB")) {
                    bKGD_red = getIntAttribute(bKGD_node, "red");
                    bKGD_green = getIntAttribute(bKGD_node, "green");
                    bKGD_blue = getIntAttribute(bKGD_node, "blue");
                    bKGD_colorType = PNGImageReader.PNG_COLOR_RGB;
                } else {
                    fatal(node, "Bad child of a bKGD node!");
                }
                if (bKGD_node.getNextSibling() != null) {
                    fatal(node, "bKGD node has more than one child!");
                }

                bKGD_present = true;
            } else if (name.equals("cHRM")) {
                cHRM_whitePointX = getIntAttribute(node, "whitePointX");
                cHRM_whitePointY = getIntAttribute(node, "whitePointY");
                cHRM_redX = getIntAttribute(node, "redX");
                cHRM_redY = getIntAttribute(node, "redY");
                cHRM_greenX = getIntAttribute(node, "greenX");
                cHRM_greenY = getIntAttribute(node, "greenY");
                cHRM_blueX = getIntAttribute(node, "blueX");
                cHRM_blueY = getIntAttribute(node, "blueY");
                
                cHRM_present = true;
            } else if (name.equals("gAMA")) {
                gAMA_gamma = getIntAttribute(node, "value");
                gAMA_present = true;
            } else if (name.equals("hIST")) {
                char[] hist = new char[256];
                int maxindex = -1;
                
                Node hIST_entry = node.getFirstChild();
                if (hIST_entry == null) {
                    fatal(node, "hIST node has no children!");
                }

                while (hIST_entry != null) {
                    if (!hIST_entry.getNodeName().equals("hISTEntry")) {
                        fatal(node,
                              "Only a hISTEntry may be a child of a hIST!");
                    }
                    
                    int index = getIntAttribute(hIST_entry, "index");
                    if (index < 0 || index > 255) {
                        fatal(node,
                              "Bad value for histEntry attribute index!");
                    }
                    if (index > maxindex) {
                        maxindex = index;
                    }
                    hist[index] =
                        (char)getIntAttribute(hIST_entry, "value");
                    
                    hIST_entry = hIST_entry.getNextSibling();
                }
                
                int numEntries = maxindex + 1;
                hIST_histogram = new char[numEntries];
                System.arraycopy(hist, 0, hIST_histogram, 0, numEntries);
                
                hIST_present = true;
            } else if (name.equals("iCCP")) {
                iCCP_profileName = getAttribute(node, "profileName");
                iCCP_compressionMethod =
                    getEnumeratedAttribute(node, "compressionMethod",
                                           iCCP_compressionMethodNames);
                Object compressedProfile =
                    ((IIOMetadataNode)node).getUserObject();
                if (compressedProfile == null) {
                    fatal(node, "No ICCP profile present in user object!");
                }
                if (!(compressedProfile instanceof byte[])) {
                    fatal(node, "User object not a byte array!");
                }
                
                iCCP_compressedProfile =
                    (byte[])((byte[])compressedProfile).clone();
                
                iCCP_present = true;
            } else if (name.equals("iTXt")) {
                Node iTXt_node = node.getFirstChild();
                while (iTXt_node != null) {
                    if (!iTXt_node.getNodeName().equals("iTXtEntry")) {
                        fatal(node,
                              "Only an iTXtEntry may be a child of an iTXt!");
                    }
                    
                    String keyword = getAttribute(iTXt_node, "keyword");
                    iTXt_keyword.add(keyword);
                    
                    boolean compressionFlag =
                        getBooleanAttribute(iTXt_node, "compressionFlag");
                    iTXt_compressionFlag.add(new Boolean(compressionFlag));
                    
                    String compressionMethod =
                        getAttribute(iTXt_node, "compressionMethod");
                    iTXt_compressionMethod.add(compressionMethod);
                    
                    String languageTag =
                        getAttribute(iTXt_node, "languageTag");
                    iTXt_languageTag.add(languageTag); 
                    
                    String translatedKeyword =
                        getAttribute(iTXt_node, "translatedKeyword");
                    iTXt_translatedKeyword.add(translatedKeyword);
                    
                    String text = getAttribute(iTXt_node, "text");
                    iTXt_text.add(text);
                    
                    iTXt_node = iTXt_node.getNextSibling();
                }
            } else if (name.equals("pHYs")) {
                pHYs_pixelsPerUnitXAxis =
                    getIntAttribute(node, "pixelsPerUnitXAxis");
                pHYs_pixelsPerUnitYAxis =
                    getIntAttribute(node, "pixelsPerUnitYAxis");
                pHYs_unitSpecifier =
                    getEnumeratedAttribute(node, "unitSpecifier",
                                           unitSpecifierNames);
                
                pHYs_present = true;
            } else if (name.equals("sBIT")) {
                sBIT_present = false; // Guard against partial overwrite
                Node sBIT_node = node.getFirstChild();
                if (sBIT_node == null) {
                    fatal(node, "sBIT node has no children!");
                }
                String sBIT_name = sBIT_node.getNodeName();
                if (sBIT_name.equals("sBIT_Grayscale")) {
                    sBIT_grayBits = getIntAttribute(sBIT_node, "gray");
                    sBIT_colorType = PNGImageReader.PNG_COLOR_GRAY;
                } else if (sBIT_name.equals("sBIT_GrayAlpha")) {
                    sBIT_grayBits = getIntAttribute(sBIT_node, "gray");
                    sBIT_alphaBits = getIntAttribute(sBIT_node, "alpha");
                    sBIT_colorType = PNGImageReader.PNG_COLOR_GRAY_ALPHA;
                } else if (sBIT_name.equals("sBIT_RGB")) {
                    sBIT_redBits = getIntAttribute(sBIT_node, "red");
                    sBIT_greenBits = getIntAttribute(sBIT_node, "green");
                    sBIT_blueBits = getIntAttribute(sBIT_node, "blue");
                    sBIT_colorType = PNGImageReader.PNG_COLOR_RGB;
                } else if (sBIT_name.equals("sBIT_RGBAlpha")) {
                    sBIT_redBits = getIntAttribute(sBIT_node, "red");
                    sBIT_greenBits = getIntAttribute(sBIT_node, "green");
                    sBIT_blueBits = getIntAttribute(sBIT_node, "blue");
                    sBIT_alphaBits = getIntAttribute(sBIT_node, "alpha");
                    sBIT_colorType = PNGImageReader.PNG_COLOR_RGB_ALPHA;
                } else if (sBIT_name.equals("sBIT_Palette")) {
                    sBIT_redBits = getIntAttribute(sBIT_node, "red");
                    sBIT_greenBits = getIntAttribute(sBIT_node, "green");
                    sBIT_blueBits = getIntAttribute(sBIT_node, "blue");
                    sBIT_colorType = PNGImageReader.PNG_COLOR_PALETTE;
                } else {
                    fatal(node, "Bad child of an sBIT node!");
                }
                if (sBIT_node.getNextSibling() != null) {
                    fatal(node, "sBIT node has more than one child!");
                }

                sBIT_present = true;
            } else if (name.equals("sPLT")) {
                sPLT_paletteName = getAttribute(node, "name");
                sPLT_sampleDepth = getIntAttribute(node, "sampleDepth");
                
                int[] red = new int[256];
                int[] green  = new int[256];
                int[] blue = new int[256];
                int[] alpha = new int[256];
                int[] frequency = new int[256];
                int maxindex = -1;
                
                Node sPLT_entry = node.getFirstChild();
                if (sPLT_entry == null) {
                    fatal(node, "sPLT node has no children!");
                }

                while (sPLT_entry != null) {
                    if (!sPLT_entry.getNodeName().equals("sPLTEntry")) {
                        fatal(node,
                              "Only an sPLTEntry may be a child of an sPLT!");
                    }
                    
                    int index = getIntAttribute(sPLT_entry, "index");
                    if (index < 0 || index > 255) {
                        fatal(node,
                              "Bad value for PLTEEntry attribute index!");
                    }
                    if (index > maxindex) {
                        maxindex = index;
                    }
                    red[index] = getIntAttribute(sPLT_entry, "red");
                    green[index] = getIntAttribute(sPLT_entry, "green");
                    blue[index] = getIntAttribute(sPLT_entry, "blue");
                    alpha[index] = getIntAttribute(sPLT_entry, "alpha");
                    frequency[index] =
                        getIntAttribute(sPLT_entry, "frequency");
                    
                    sPLT_entry = sPLT_entry.getNextSibling();
                }
                
                int numEntries = maxindex + 1;
                sPLT_red = new int[numEntries];
                sPLT_green = new int[numEntries];
                sPLT_blue = new int[numEntries];
                sPLT_alpha = new int[numEntries];
                sPLT_frequency = new int[numEntries];
                System.arraycopy(red, 0, sPLT_red, 0, numEntries);
                System.arraycopy(green, 0, sPLT_green, 0, numEntries);
                System.arraycopy(blue, 0, sPLT_blue, 0, numEntries);
                System.arraycopy(alpha, 0, sPLT_alpha, 0, numEntries);
                System.arraycopy(frequency, 0,
                                 sPLT_frequency, 0, numEntries);
                
                sPLT_present = true;
            } else if (name.equals("sRGB")) {
                sRGB_renderingIntent =
                    getEnumeratedAttribute(node, "renderingIntent",
                                           renderingIntentNames);
                
                sRGB_present = true;
            } else if (name.equals("tEXt")) {
                Node tEXt_node = node.getFirstChild();
                while (tEXt_node != null) {
                    if (!tEXt_node.getNodeName().equals("tEXtEntry")) {
                        fatal(node,
                              "Only an tEXtEntry may be a child of an tEXt!");
                    }
                    
                    String keyword = getAttribute(tEXt_node, "keyword");
                    tEXt_keyword.add(keyword);
                    
                    String text = getAttribute(tEXt_node, "value");
                    tEXt_text.add(text);
                    
                    tEXt_node = tEXt_node.getNextSibling();
                }
            } else if (name.equals("tIME")) {
                tIME_year = getIntAttribute(node, "year");
                tIME_month = getIntAttribute(node, "month");
                tIME_day = getIntAttribute(node, "day");
                tIME_hour = getIntAttribute(node, "hour");
                tIME_minute = getIntAttribute(node, "minute");
                tIME_second = getIntAttribute(node, "second");
                
                tIME_present = true;
            } else if (name.equals("tRNS")) {
                tRNS_present = false; // Guard against partial overwrite
                Node tRNS_node = node.getFirstChild();
                if (tRNS_node == null) {
                    fatal(node, "tRNS node has no children!");
                }
                String tRNS_name = tRNS_node.getNodeName();
                if (tRNS_name.equals("tRNS_Palette")) {
                    byte[] alpha = new byte[256];
                    int maxindex = -1;
                    
                    Node tRNS_paletteEntry = tRNS_node.getFirstChild();
                    if (tRNS_paletteEntry == null) {
                        fatal(node, "tRNS_Palette node has no children!");
                    }
                    while (tRNS_paletteEntry != null) {
                        if (!tRNS_paletteEntry.getNodeName().equals(
                                                        "tRNS_PaletteEntry")) {
                            fatal(node,
                 "Only a tRNS_PaletteEntry may be a child of a tRNS_Palette!");
                        }
                        int index =
                            getIntAttribute(tRNS_paletteEntry, "index");
                        if (index < 0 || index > 255) {
                            fatal(node,
                           "Bad value for tRNS_PaletteEntry attribute index!");
                        }
                        if (index > maxindex) {
                            maxindex = index;
                        }
                        alpha[index] =
                            (byte)getIntAttribute(tRNS_paletteEntry,
                                                  "alpha");
                        
                        tRNS_paletteEntry =
                            tRNS_paletteEntry.getNextSibling();
                    }
                    
                    int numEntries = maxindex + 1;
                    tRNS_alpha = new byte[numEntries];
                    tRNS_colorType = PNGImageReader.PNG_COLOR_PALETTE;
                    System.arraycopy(alpha, 0, tRNS_alpha, 0, numEntries);
                } else if (tRNS_name.equals("tRNS_Grayscale")) {