Convert src/core/type1_font.js to use standard classes
This commit is contained in:
Jonas Jenwald
parent
4bd69556ab
commit
f64b7922b3
@ -30,129 +30,130 @@ import { Stream } from "./stream.js";
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import { Type1Parser } from "./type1_parser.js";
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import { warn } from "../shared/util.js";
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// Type1Font is also a CIDFontType0.
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const Type1Font = (function Type1FontClosure() {
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function findBlock(streamBytes, signature, startIndex) {
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const streamBytesLength = streamBytes.length;
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const signatureLength = signature.length;
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const scanLength = streamBytesLength - signatureLength;
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function findBlock(streamBytes, signature, startIndex) {
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const streamBytesLength = streamBytes.length;
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const signatureLength = signature.length;
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const scanLength = streamBytesLength - signatureLength;
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let i = startIndex,
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found = false;
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while (i < scanLength) {
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let j = 0;
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while (j < signatureLength && streamBytes[i + j] === signature[j]) {
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j++;
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}
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if (j >= signatureLength) {
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// `signature` found, skip over whitespace.
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i += j;
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while (i < streamBytesLength && isWhiteSpace(streamBytes[i])) {
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i++;
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}
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found = true;
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break;
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}
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i++;
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let i = startIndex,
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found = false;
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while (i < scanLength) {
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let j = 0;
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while (j < signatureLength && streamBytes[i + j] === signature[j]) {
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j++;
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}
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return {
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found,
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length: i,
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};
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if (j >= signatureLength) {
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// `signature` found, skip over whitespace.
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i += j;
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while (i < streamBytesLength && isWhiteSpace(streamBytes[i])) {
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i++;
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}
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found = true;
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break;
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}
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i++;
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}
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return {
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found,
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length: i,
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};
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}
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function getHeaderBlock(stream, suggestedLength) {
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const EEXEC_SIGNATURE = [0x65, 0x65, 0x78, 0x65, 0x63];
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const streamStartPos = stream.pos; // Save the initial stream position.
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let headerBytes, headerBytesLength, block;
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try {
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headerBytes = stream.getBytes(suggestedLength);
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headerBytesLength = headerBytes.length;
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} catch (ex) {
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if (ex instanceof MissingDataException) {
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throw ex;
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}
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// Ignore errors if the `suggestedLength` is huge enough that a Uint8Array
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// cannot hold the result of `getBytes`, and fallback to simply checking
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// the entire stream (fixes issue3928.pdf).
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}
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function getHeaderBlock(stream, suggestedLength) {
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const EEXEC_SIGNATURE = [0x65, 0x65, 0x78, 0x65, 0x63];
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if (headerBytesLength === suggestedLength) {
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// Most of the time `suggestedLength` is correct, so to speed things up we
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// initially only check the last few bytes to see if the header was found.
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// Otherwise we (potentially) check the entire stream to prevent errors in
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// `Type1Parser` (fixes issue5686.pdf).
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block = findBlock(
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headerBytes,
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EEXEC_SIGNATURE,
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suggestedLength - 2 * EEXEC_SIGNATURE.length
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);
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const streamStartPos = stream.pos; // Save the initial stream position.
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let headerBytes, headerBytesLength, block;
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try {
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headerBytes = stream.getBytes(suggestedLength);
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headerBytesLength = headerBytes.length;
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} catch (ex) {
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if (ex instanceof MissingDataException) {
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throw ex;
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}
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// Ignore errors if the `suggestedLength` is huge enough that a Uint8Array
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// cannot hold the result of `getBytes`, and fallback to simply checking
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// the entire stream (fixes issue3928.pdf).
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}
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if (headerBytesLength === suggestedLength) {
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// Most of the time `suggestedLength` is correct, so to speed things up we
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// initially only check the last few bytes to see if the header was found.
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// Otherwise we (potentially) check the entire stream to prevent errors in
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// `Type1Parser` (fixes issue5686.pdf).
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block = findBlock(
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headerBytes,
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EEXEC_SIGNATURE,
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suggestedLength - 2 * EEXEC_SIGNATURE.length
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);
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if (block.found && block.length === suggestedLength) {
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return {
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stream: new Stream(headerBytes),
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length: suggestedLength,
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};
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}
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}
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warn('Invalid "Length1" property in Type1 font -- trying to recover.');
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stream.pos = streamStartPos; // Reset the stream position.
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const SCAN_BLOCK_LENGTH = 2048;
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let actualLength;
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while (true) {
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const scanBytes = stream.peekBytes(SCAN_BLOCK_LENGTH);
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block = findBlock(scanBytes, EEXEC_SIGNATURE, 0);
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if (block.length === 0) {
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break;
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}
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stream.pos += block.length; // Update the stream position.
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if (block.found) {
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actualLength = stream.pos - streamStartPos;
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break;
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}
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}
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stream.pos = streamStartPos; // Reset the stream position.
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if (actualLength) {
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if (block.found && block.length === suggestedLength) {
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return {
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stream: new Stream(stream.getBytes(actualLength)),
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length: actualLength,
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stream: new Stream(headerBytes),
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length: suggestedLength,
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};
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}
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warn('Unable to recover "Length1" property in Type1 font -- using as is.');
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}
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warn('Invalid "Length1" property in Type1 font -- trying to recover.');
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stream.pos = streamStartPos; // Reset the stream position.
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const SCAN_BLOCK_LENGTH = 2048;
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let actualLength;
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while (true) {
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const scanBytes = stream.peekBytes(SCAN_BLOCK_LENGTH);
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block = findBlock(scanBytes, EEXEC_SIGNATURE, 0);
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if (block.length === 0) {
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break;
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}
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stream.pos += block.length; // Update the stream position.
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if (block.found) {
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actualLength = stream.pos - streamStartPos;
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break;
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}
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}
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stream.pos = streamStartPos; // Reset the stream position.
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if (actualLength) {
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return {
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stream: new Stream(stream.getBytes(suggestedLength)),
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length: suggestedLength,
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stream: new Stream(stream.getBytes(actualLength)),
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length: actualLength,
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};
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}
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warn('Unable to recover "Length1" property in Type1 font -- using as is.');
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return {
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stream: new Stream(stream.getBytes(suggestedLength)),
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length: suggestedLength,
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};
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}
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function getEexecBlock(stream, suggestedLength) {
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// We should ideally parse the eexec block to ensure that `suggestedLength`
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// is correct, so we don't truncate the block data if it's too small.
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// However, this would also require checking if the fixed-content portion
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// exists (using the 'Length3' property), and ensuring that it's valid.
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//
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// Given that `suggestedLength` almost always is correct, all the validation
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// would require a great deal of unnecessary parsing for most fonts.
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// To save time, we always fetch the entire stream instead, which also avoid
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// issues if `suggestedLength` is huge (see comment in `getHeaderBlock`).
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//
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// NOTE: This means that the function can include the fixed-content portion
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// in the returned eexec block. In practice this does *not* seem to matter,
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// since `Type1Parser_extractFontProgram` will skip over any non-commands.
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const eexecBytes = stream.getBytes();
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return {
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stream: new Stream(eexecBytes),
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length: eexecBytes.length,
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};
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}
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function getEexecBlock(stream, suggestedLength) {
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// We should ideally parse the eexec block to ensure that `suggestedLength`
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// is correct, so we don't truncate the block data if it's too small.
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// However, this would also require checking if the fixed-content portion
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// exists (using the 'Length3' property), and ensuring that it's valid.
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//
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// Given that `suggestedLength` almost always is correct, all the validation
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// would require a great deal of unnecessary parsing for most fonts.
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// To save time, we always fetch the entire stream instead, which also avoid
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// issues if `suggestedLength` is huge (see comment in `getHeaderBlock`).
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//
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// NOTE: This means that the function can include the fixed-content portion
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// in the returned eexec block. In practice this does *not* seem to matter,
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// since `Type1Parser_extractFontProgram` will skip over any non-commands.
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const eexecBytes = stream.getBytes();
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return {
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stream: new Stream(eexecBytes),
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length: eexecBytes.length,
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};
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}
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// eslint-disable-next-line no-shadow
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function Type1Font(name, file, properties) {
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/**
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* Type1Font is also a CIDFontType0.
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*/
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class Type1Font {
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constructor(name, file, properties) {
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// Some bad generators embed pfb file as is, we have to strip 6-byte header.
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// Also, length1 and length2 might be off by 6 bytes as well.
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// http://www.math.ubc.ca/~cass/piscript/type1.pdf
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@ -215,222 +216,209 @@ const Type1Font = (function Type1FontClosure() {
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this.seacs = this.getSeacs(data.charstrings);
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}
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Type1Font.prototype = {
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get numGlyphs() {
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return this.charstrings.length + 1;
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},
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get numGlyphs() {
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return this.charstrings.length + 1;
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}
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getCharset: function Type1Font_getCharset() {
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const charset = [".notdef"];
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const charstrings = this.charstrings;
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for (let glyphId = 0; glyphId < charstrings.length; glyphId++) {
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charset.push(charstrings[glyphId].glyphName);
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getCharset() {
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const charset = [".notdef"];
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const charstrings = this.charstrings;
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for (let glyphId = 0; glyphId < charstrings.length; glyphId++) {
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charset.push(charstrings[glyphId].glyphName);
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}
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return charset;
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}
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getGlyphMapping(properties) {
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const charstrings = this.charstrings;
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if (properties.composite) {
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const charCodeToGlyphId = Object.create(null);
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// Map CIDs directly to GIDs.
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for (
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let glyphId = 0, charstringsLen = charstrings.length;
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glyphId < charstringsLen;
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glyphId++
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) {
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const charCode = properties.cMap.charCodeOf(glyphId);
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// Add 1 because glyph 0 is duplicated.
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charCodeToGlyphId[charCode] = glyphId + 1;
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}
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return charset;
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},
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return charCodeToGlyphId;
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}
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getGlyphMapping: function Type1Font_getGlyphMapping(properties) {
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const charstrings = this.charstrings;
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if (properties.composite) {
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const charCodeToGlyphId = Object.create(null);
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// Map CIDs directly to GIDs.
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for (
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let glyphId = 0, charstringsLen = charstrings.length;
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glyphId < charstringsLen;
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glyphId++
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) {
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const charCode = properties.cMap.charCodeOf(glyphId);
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// Add 1 because glyph 0 is duplicated.
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charCodeToGlyphId[charCode] = glyphId + 1;
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}
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return charCodeToGlyphId;
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}
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const glyphNames = [".notdef"];
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let builtInEncoding, glyphId;
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for (glyphId = 0; glyphId < charstrings.length; glyphId++) {
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glyphNames.push(charstrings[glyphId].glyphName);
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}
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const encoding = properties.builtInEncoding;
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if (encoding) {
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builtInEncoding = Object.create(null);
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for (const charCode in encoding) {
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glyphId = glyphNames.indexOf(encoding[charCode]);
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if (glyphId >= 0) {
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builtInEncoding[charCode] = glyphId;
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}
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const glyphNames = [".notdef"];
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let builtInEncoding, glyphId;
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for (glyphId = 0; glyphId < charstrings.length; glyphId++) {
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glyphNames.push(charstrings[glyphId].glyphName);
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}
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const encoding = properties.builtInEncoding;
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if (encoding) {
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builtInEncoding = Object.create(null);
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for (const charCode in encoding) {
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glyphId = glyphNames.indexOf(encoding[charCode]);
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if (glyphId >= 0) {
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builtInEncoding[charCode] = glyphId;
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}
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}
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}
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return type1FontGlyphMapping(properties, builtInEncoding, glyphNames);
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},
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return type1FontGlyphMapping(properties, builtInEncoding, glyphNames);
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}
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hasGlyphId: function Type1Font_hasGlyphID(id) {
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if (id < 0 || id >= this.numGlyphs) {
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return false;
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hasGlyphId(id) {
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if (id < 0 || id >= this.numGlyphs) {
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return false;
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}
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if (id === 0) {
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// notdef is always defined.
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return true;
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}
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const glyph = this.charstrings[id - 1];
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return glyph.charstring.length > 0;
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}
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getSeacs(charstrings) {
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const seacMap = [];
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for (let i = 0, ii = charstrings.length; i < ii; i++) {
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const charstring = charstrings[i];
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if (charstring.seac) {
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// Offset by 1 for .notdef
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seacMap[i + 1] = charstring.seac;
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}
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if (id === 0) {
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// notdef is always defined.
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return true;
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}
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const glyph = this.charstrings[id - 1];
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return glyph.charstring.length > 0;
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},
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}
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return seacMap;
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}
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getSeacs: function Type1Font_getSeacs(charstrings) {
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let i, ii;
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const seacMap = [];
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for (i = 0, ii = charstrings.length; i < ii; i++) {
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const charstring = charstrings[i];
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if (charstring.seac) {
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// Offset by 1 for .notdef
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seacMap[i + 1] = charstring.seac;
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getType2Charstrings(type1Charstrings) {
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const type2Charstrings = [];
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for (let i = 0, ii = type1Charstrings.length; i < ii; i++) {
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type2Charstrings.push(type1Charstrings[i].charstring);
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}
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return type2Charstrings;
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}
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getType2Subrs(type1Subrs) {
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let bias = 0;
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const count = type1Subrs.length;
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if (count < 1133) {
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bias = 107;
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} else if (count < 33769) {
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bias = 1131;
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} else {
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bias = 32768;
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}
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// Add a bunch of empty subrs to deal with the Type2 bias
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const type2Subrs = [];
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let i;
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for (i = 0; i < bias; i++) {
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type2Subrs.push([0x0b]);
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}
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for (i = 0; i < count; i++) {
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type2Subrs.push(type1Subrs[i]);
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}
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return type2Subrs;
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}
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wrap(name, glyphs, charstrings, subrs, properties) {
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const cff = new CFF();
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cff.header = new CFFHeader(1, 0, 4, 4);
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cff.names = [name];
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const topDict = new CFFTopDict();
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// CFF strings IDs 0...390 are predefined names, so refering
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// to entries in our own String INDEX starts at SID 391.
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topDict.setByName("version", 391);
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topDict.setByName("Notice", 392);
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topDict.setByName("FullName", 393);
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topDict.setByName("FamilyName", 394);
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topDict.setByName("Weight", 395);
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topDict.setByName("Encoding", null); // placeholder
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topDict.setByName("FontMatrix", properties.fontMatrix);
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topDict.setByName("FontBBox", properties.bbox);
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topDict.setByName("charset", null); // placeholder
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topDict.setByName("CharStrings", null); // placeholder
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topDict.setByName("Private", null); // placeholder
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cff.topDict = topDict;
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const strings = new CFFStrings();
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strings.add("Version 0.11"); // Version
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strings.add("See original notice"); // Notice
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strings.add(name); // FullName
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strings.add(name); // FamilyName
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strings.add("Medium"); // Weight
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cff.strings = strings;
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cff.globalSubrIndex = new CFFIndex();
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const count = glyphs.length;
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const charsetArray = [".notdef"];
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let i, ii;
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for (i = 0; i < count; i++) {
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const glyphName = charstrings[i].glyphName;
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const index = CFFStandardStrings.indexOf(glyphName);
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if (index === -1) {
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strings.add(glyphName);
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}
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charsetArray.push(glyphName);
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}
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cff.charset = new CFFCharset(false, 0, charsetArray);
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const charStringsIndex = new CFFIndex();
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charStringsIndex.add([0x8b, 0x0e]); // .notdef
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for (i = 0; i < count; i++) {
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charStringsIndex.add(glyphs[i]);
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}
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cff.charStrings = charStringsIndex;
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const privateDict = new CFFPrivateDict();
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privateDict.setByName("Subrs", null); // placeholder
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const fields = [
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"BlueValues",
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"OtherBlues",
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"FamilyBlues",
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"FamilyOtherBlues",
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"StemSnapH",
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"StemSnapV",
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"BlueShift",
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"BlueFuzz",
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"BlueScale",
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"LanguageGroup",
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"ExpansionFactor",
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"ForceBold",
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"StdHW",
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"StdVW",
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];
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for (i = 0, ii = fields.length; i < ii; i++) {
|
||||
const field = fields[i];
|
||||
if (!(field in properties.privateData)) {
|
||||
continue;
|
||||
}
|
||||
const value = properties.privateData[field];
|
||||
if (Array.isArray(value)) {
|
||||
// All of the private dictionary array data in CFF must be stored as
|
||||
// "delta-encoded" numbers.
|
||||
for (let j = value.length - 1; j > 0; j--) {
|
||||
value[j] -= value[j - 1]; // ... difference from previous value
|
||||
}
|
||||
}
|
||||
return seacMap;
|
||||
},
|
||||
privateDict.setByName(field, value);
|
||||
}
|
||||
cff.topDict.privateDict = privateDict;
|
||||
|
||||
getType2Charstrings: function Type1Font_getType2Charstrings(
|
||||
type1Charstrings
|
||||
) {
|
||||
const type2Charstrings = [];
|
||||
for (let i = 0, ii = type1Charstrings.length; i < ii; i++) {
|
||||
type2Charstrings.push(type1Charstrings[i].charstring);
|
||||
}
|
||||
return type2Charstrings;
|
||||
},
|
||||
const subrIndex = new CFFIndex();
|
||||
for (i = 0, ii = subrs.length; i < ii; i++) {
|
||||
subrIndex.add(subrs[i]);
|
||||
}
|
||||
privateDict.subrsIndex = subrIndex;
|
||||
|
||||
getType2Subrs: function Type1Font_getType2Subrs(type1Subrs) {
|
||||
let bias = 0;
|
||||
const count = type1Subrs.length;
|
||||
if (count < 1133) {
|
||||
bias = 107;
|
||||
} else if (count < 33769) {
|
||||
bias = 1131;
|
||||
} else {
|
||||
bias = 32768;
|
||||
}
|
||||
|
||||
// Add a bunch of empty subrs to deal with the Type2 bias
|
||||
const type2Subrs = [];
|
||||
let i;
|
||||
for (i = 0; i < bias; i++) {
|
||||
type2Subrs.push([0x0b]);
|
||||
}
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
type2Subrs.push(type1Subrs[i]);
|
||||
}
|
||||
|
||||
return type2Subrs;
|
||||
},
|
||||
|
||||
wrap: function Type1Font_wrap(
|
||||
name,
|
||||
glyphs,
|
||||
charstrings,
|
||||
subrs,
|
||||
properties
|
||||
) {
|
||||
const cff = new CFF();
|
||||
cff.header = new CFFHeader(1, 0, 4, 4);
|
||||
|
||||
cff.names = [name];
|
||||
|
||||
const topDict = new CFFTopDict();
|
||||
// CFF strings IDs 0...390 are predefined names, so refering
|
||||
// to entries in our own String INDEX starts at SID 391.
|
||||
topDict.setByName("version", 391);
|
||||
topDict.setByName("Notice", 392);
|
||||
topDict.setByName("FullName", 393);
|
||||
topDict.setByName("FamilyName", 394);
|
||||
topDict.setByName("Weight", 395);
|
||||
topDict.setByName("Encoding", null); // placeholder
|
||||
topDict.setByName("FontMatrix", properties.fontMatrix);
|
||||
topDict.setByName("FontBBox", properties.bbox);
|
||||
topDict.setByName("charset", null); // placeholder
|
||||
topDict.setByName("CharStrings", null); // placeholder
|
||||
topDict.setByName("Private", null); // placeholder
|
||||
cff.topDict = topDict;
|
||||
|
||||
const strings = new CFFStrings();
|
||||
strings.add("Version 0.11"); // Version
|
||||
strings.add("See original notice"); // Notice
|
||||
strings.add(name); // FullName
|
||||
strings.add(name); // FamilyName
|
||||
strings.add("Medium"); // Weight
|
||||
cff.strings = strings;
|
||||
|
||||
cff.globalSubrIndex = new CFFIndex();
|
||||
|
||||
const count = glyphs.length;
|
||||
const charsetArray = [".notdef"];
|
||||
let i, ii;
|
||||
for (i = 0; i < count; i++) {
|
||||
const glyphName = charstrings[i].glyphName;
|
||||
const index = CFFStandardStrings.indexOf(glyphName);
|
||||
if (index === -1) {
|
||||
strings.add(glyphName);
|
||||
}
|
||||
charsetArray.push(glyphName);
|
||||
}
|
||||
cff.charset = new CFFCharset(false, 0, charsetArray);
|
||||
|
||||
const charStringsIndex = new CFFIndex();
|
||||
charStringsIndex.add([0x8b, 0x0e]); // .notdef
|
||||
for (i = 0; i < count; i++) {
|
||||
charStringsIndex.add(glyphs[i]);
|
||||
}
|
||||
cff.charStrings = charStringsIndex;
|
||||
|
||||
const privateDict = new CFFPrivateDict();
|
||||
privateDict.setByName("Subrs", null); // placeholder
|
||||
const fields = [
|
||||
"BlueValues",
|
||||
"OtherBlues",
|
||||
"FamilyBlues",
|
||||
"FamilyOtherBlues",
|
||||
"StemSnapH",
|
||||
"StemSnapV",
|
||||
"BlueShift",
|
||||
"BlueFuzz",
|
||||
"BlueScale",
|
||||
"LanguageGroup",
|
||||
"ExpansionFactor",
|
||||
"ForceBold",
|
||||
"StdHW",
|
||||
"StdVW",
|
||||
];
|
||||
for (i = 0, ii = fields.length; i < ii; i++) {
|
||||
const field = fields[i];
|
||||
if (!(field in properties.privateData)) {
|
||||
continue;
|
||||
}
|
||||
const value = properties.privateData[field];
|
||||
if (Array.isArray(value)) {
|
||||
// All of the private dictionary array data in CFF must be stored as
|
||||
// "delta-encoded" numbers.
|
||||
for (let j = value.length - 1; j > 0; j--) {
|
||||
value[j] -= value[j - 1]; // ... difference from previous value
|
||||
}
|
||||
}
|
||||
privateDict.setByName(field, value);
|
||||
}
|
||||
cff.topDict.privateDict = privateDict;
|
||||
|
||||
const subrIndex = new CFFIndex();
|
||||
for (i = 0, ii = subrs.length; i < ii; i++) {
|
||||
subrIndex.add(subrs[i]);
|
||||
}
|
||||
privateDict.subrsIndex = subrIndex;
|
||||
|
||||
const compiler = new CFFCompiler(cff);
|
||||
return compiler.compile();
|
||||
},
|
||||
};
|
||||
|
||||
return Type1Font;
|
||||
})();
|
||||
const compiler = new CFFCompiler(cff);
|
||||
return compiler.compile();
|
||||
}
|
||||
}
|
||||
|
||||
export { Type1Font };
|
||||
|
||||
Loading…
Reference in New Issue
Block a user