mirror of
https://git.huckle.dev/Huckles-Minecraft-Archive/jpexs-decompiler.git
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gnujpdf:
- adding custom ttf font - print transparent text - set raw transformation matrix
This commit is contained in:
Jindra Petřík
278
libsrc/gnujpdf/src/gnu/jpdf/TtfParser.java
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278
libsrc/gnujpdf/src/gnu/jpdf/TtfParser.java
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package gnu.jpdf;
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import java.awt.Font;
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import java.awt.FontFormatException;
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import java.io.EOFException;
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import java.io.File;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.TreeMap;
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/**
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*
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* @author JPEXS
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*/
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public class TtfParser {
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private int size = -1;
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private long headOffset = -1;
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private long os2Offset = -1;
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private long hheaOffset = -1;
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private long hmtxOffset = -1;
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private long cmapOffset = -1;
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private Font font;
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private int ascent;
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private int descent;
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private int capHeight;
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private float scale;
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private int numOfHMetrics;
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private List<Integer> advanceWidths = new ArrayList<>();
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private Map<Integer, Integer> cmap = new TreeMap<>();
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private int firstChar = -1;
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private int lastChar = -1;
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public void loadFromTTF(File file, int size) throws IOException, FontFormatException {
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font = Font.createFont(Font.TRUETYPE_FONT, file);
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RandomAccessFile input = new RandomAccessFile(file, "r");
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this.size = size;
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if (input == null) {
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throw new IllegalArgumentException("input cannot be null.");
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}
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readTableDirectory(input);
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if (headOffset == -1) {
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throw new IOException("HEAD table not found.");
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}
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readHEAD(input);
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readOS2(input);
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readHHEA(input);
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readHMTX(input);
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readCMAP(input);
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input.close();
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}
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public int getFirstChar() {
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return firstChar;
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}
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public int getLastChar() {
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return lastChar;
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}
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public List<Integer> getAdvanceWidths() {
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return advanceWidths;
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}
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public Map<Integer, Integer> getCmap() {
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return cmap;
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}
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private void readTableDirectory(RandomAccessFile input) throws IOException {
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skip(input, 4);
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int tableCount = readUnsignedShort(input);
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skip(input, 6);
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byte[] tagBytes = new byte[4];
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long prevOffset = 0;
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for (int i = 0; i < tableCount; i++) {
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tagBytes[0] = readByte(input);
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tagBytes[1] = readByte(input);
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tagBytes[2] = readByte(input);
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tagBytes[3] = readByte(input);
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skip(input, 4);
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long offset = readUnsignedLong(input);
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long length = readUnsignedLong(input);
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prevOffset = offset;
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String tag = new String(tagBytes, "ISO-8859-1");
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//System.err.println("tag " + tag + ", length: " + length);
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if (tag.equals("head")) {
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headOffset = offset;
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}
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if (tag.equals("OS/2")) {
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os2Offset = offset;
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}
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if (tag.equals("hhea")) {
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hheaOffset = offset;
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}
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if (tag.equals("hmtx")) {
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hmtxOffset = offset;
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}
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if (tag.equals("cmap")) {
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cmapOffset = offset;
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}
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}
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}
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private void readCMAP(RandomAccessFile input) throws IOException {
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seek(input, cmapOffset);
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int version = readUnsignedShort(input);
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int numberSubtables = readUnsignedShort(input);
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for (int i = 0; i < numberSubtables; i++) {
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int platFormId = readUnsignedShort(input);
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int platFormSpecificId = readUnsignedShort(input);
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long offset = readUnsignedLong(input);
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seek(input, cmapOffset + offset);
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int format = readUnsignedShort(input);
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switch (format) {
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case 4:
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int length = readUnsignedShort(input);
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int languageCode = readUnsignedShort(input);
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int segCountX2 = readUnsignedShort(input);
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int segCount = segCountX2 / 2;
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int searchRange = readUnsignedShort(input);
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int entrySelector = readUnsignedShort(input);
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int rangeShift = readUnsignedShort(input);
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List<Integer> endCodes = new ArrayList<>();
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List<Integer> startCodes = new ArrayList<>();
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List<Integer> idDeltas = new ArrayList<>();
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List<Integer> idRangeOffsets = new ArrayList<>();
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for (int j = 0; j < segCount; j++) {
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int endCode = readUnsignedShort(input);
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endCodes.add(endCode);
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}
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readUnsignedShort(input);//pad
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for (int j = 0; j < segCount; j++) {
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int startCode = readUnsignedShort(input);
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startCodes.add(startCode);
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}
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for (int j = 0; j < segCount; j++) {
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int idDelta = readShort(input);
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idDeltas.add(idDelta);
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}
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for (int j = 0; j < segCount; j++) {
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int idRangeOffset = readUnsignedShort(input);
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idRangeOffsets.add(idRangeOffset);
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}
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List<Integer> glyphIndices = new ArrayList<>();
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long startA = input.getFilePointer();
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;
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long a = startA;
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for (; a < cmapOffset + offset + length; a += 2) {
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int glyphIndex = readUnsignedShort(input);
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glyphIndices.add(glyphIndex);
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}
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for (int j = 0; j < segCount; j++) {
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for (int k = startCodes.get(j); k <= endCodes.get(j); k++) {
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if (k == 65535) {
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continue;
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}
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if (idRangeOffsets.get(j) == 0) {
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int glyph = (idDeltas.get(j) + k) % 65536;
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cmap.put(k, glyph);
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} else {
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int glyphIndex = (idRangeOffsets.get(j) - 2 * (segCount - j)) / 2 + (k - startCodes.get(j));
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int glyph = glyphIndices.get(glyphIndex);
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cmap.put(k, glyph);
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}
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}
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}
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break;
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}
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break;
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}
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//System.err.println("format=" + format);
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}
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private void readHMTX(RandomAccessFile input) throws IOException {
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seek(input, hmtxOffset);
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for (int i = 0; i < numOfHMetrics; i++) {
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int advanceWidth = readUnsignedShort(input);
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advanceWidths.add((int) (scale * advanceWidth));
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int leftSideBearing = readUnsignedShort(input);
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}
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}
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private void readHHEA(RandomAccessFile input) throws IOException {
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seek(input, hheaOffset + 4);
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ascent = (int) (scale * readShort(input));
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descent = (int) (scale * readShort(input));
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capHeight = ascent;
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seek(input, hheaOffset + 34);
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numOfHMetrics = readUnsignedShort(input);
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}
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private void readHEAD(RandomAccessFile input) throws IOException {
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seek(input, headOffset + 2 * 4 + 2 * 4 + 2);
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int unitsPerEm = readUnsignedShort(input);
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scale = (float) size / (float) unitsPerEm;
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}
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private void readOS2(RandomAccessFile input) throws IOException {
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seek(input, os2Offset + 68);
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//ascent = readShort(input);
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//descent = readShort(input);
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seek(input, os2Offset + 88);
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//capHeight = readShort(input);
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}
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public int getAscent() {
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return ascent;
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}
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public int getDescent() {
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return descent;
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}
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public int getCapHeight() {
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return capHeight;
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}
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private int readUnsignedByte(RandomAccessFile input) throws IOException {
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int b = input.read();
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if (b == -1) {
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throw new EOFException("Unexpected end of file.");
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}
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return b;
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}
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private byte readByte(RandomAccessFile input) throws IOException {
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return (byte) readUnsignedByte(input);
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}
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private int readUnsignedShort(RandomAccessFile input) throws IOException {
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return (readUnsignedByte(input) << 8) + readUnsignedByte(input);
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}
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private short readShort(RandomAccessFile input) throws IOException {
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return (short) readUnsignedShort(input);
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}
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private long readUnsignedLong(RandomAccessFile input) throws IOException {
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long value = readUnsignedByte(input);
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value = (value << 8) + readUnsignedByte(input);
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value = (value << 8) + readUnsignedByte(input);
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value = (value << 8) + readUnsignedByte(input);
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return value;
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}
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private void skip(RandomAccessFile input, long skip) throws IOException {
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input.seek(input.getFilePointer() + skip);
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}
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private void seek(RandomAccessFile input, long position) throws IOException {
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//skip(input, position - bytePosition);
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input.seek(position);
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}
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}
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