Remove the IR (internal representation) part of the PDFFunction parsing
*This follows the exact same princial as PR 12083, but for the `PDFFunction` parsing instead.* Given that the IR format is completely unused now, all that the current code does is add a bunch of unnecessary indirection/overhead to the handling of PDF-functions.
This commit is contained in:
Jonas Jenwald
parent
f1ae7d7b0e
commit
d35fe3e796
@ -132,11 +132,6 @@ function toNumberArray(arr) {
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}
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const PDFFunction = (function PDFFunctionClosure() {
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const CONSTRUCT_SAMPLED = 0;
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const CONSTRUCT_INTERPOLATED = 2;
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const CONSTRUCT_STICHED = 3;
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const CONSTRUCT_POSTSCRIPT = 4;
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return {
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getSampleArray(size, outputSize, bps, stream) {
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let i, ii;
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@ -167,51 +162,23 @@ const PDFFunction = (function PDFFunctionClosure() {
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return array;
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},
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getIR({ xref, isEvalSupported, fn }) {
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let dict = fn.dict;
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if (!dict) {
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dict = fn;
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}
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const types = [
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this.constructSampled,
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null,
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this.constructInterpolated,
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this.constructStiched,
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this.constructPostScript,
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];
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const typeNum = dict.get("FunctionType");
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const typeFn = types[typeNum];
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if (!typeFn) {
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throw new FormatError("Unknown type of function");
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}
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return typeFn.call(this, { xref, isEvalSupported, fn, dict });
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},
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fromIR({ xref, isEvalSupported, IR }) {
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const type = IR[0];
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switch (type) {
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case CONSTRUCT_SAMPLED:
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return this.constructSampledFromIR({ xref, isEvalSupported, IR });
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case CONSTRUCT_INTERPOLATED:
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return this.constructInterpolatedFromIR({
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xref,
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isEvalSupported,
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IR,
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});
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case CONSTRUCT_STICHED:
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return this.constructStichedFromIR({ xref, isEvalSupported, IR });
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// case CONSTRUCT_POSTSCRIPT:
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default:
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return this.constructPostScriptFromIR({ xref, isEvalSupported, IR });
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}
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},
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parse({ xref, isEvalSupported, fn }) {
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const IR = this.getIR({ xref, isEvalSupported, fn });
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return this.fromIR({ xref, isEvalSupported, IR });
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const dict = fn.dict || fn;
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const typeNum = dict.get("FunctionType");
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switch (typeNum) {
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case 0:
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return this.constructSampled({ xref, isEvalSupported, fn, dict });
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case 1:
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break;
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case 2:
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return this.constructInterpolated({ xref, isEvalSupported, dict });
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case 3:
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return this.constructStiched({ xref, isEvalSupported, dict });
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case 4:
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return this.constructPostScript({ xref, isEvalSupported, fn, dict });
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}
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throw new FormatError("Unknown type of function");
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},
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parseArray({ xref, isEvalSupported, fnObj }) {
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@ -239,11 +206,15 @@ const PDFFunction = (function PDFFunctionClosure() {
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const out = [];
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let index = 0;
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for (let i = 0; i < inputLength; i += 2) {
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out[index] = [arr[i], arr[i + 1]];
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++index;
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out[index++] = [arr[i], arr[i + 1]];
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}
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return out;
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}
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// See chapter 3, page 109 of the PDF reference
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function interpolate(x, xmin, xmax, ymin, ymax) {
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return ymin + (x - xmin) * ((ymax - ymin) / (xmax - xmin));
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}
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let domain = toNumberArray(dict.getArray("Domain"));
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let range = toNumberArray(dict.getArray("Range"));
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@ -284,47 +255,14 @@ const PDFFunction = (function PDFFunctionClosure() {
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}
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const samples = this.getSampleArray(size, outputSize, bps, fn);
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// const mask = 2 ** bps - 1;
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return [
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CONSTRUCT_SAMPLED,
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inputSize,
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domain,
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encode,
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decode,
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samples,
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size,
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outputSize,
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2 ** bps - 1,
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range,
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];
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},
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constructSampledFromIR({ xref, isEvalSupported, IR }) {
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// See chapter 3, page 109 of the PDF reference
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function interpolate(x, xmin, xmax, ymin, ymax) {
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return ymin + (x - xmin) * ((ymax - ymin) / (xmax - xmin));
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}
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return function constructSampledFromIRResult(
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src,
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srcOffset,
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dest,
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destOffset
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) {
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return function constructSampledFn(src, srcOffset, dest, destOffset) {
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// See chapter 3, page 110 of the PDF reference.
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const m = IR[1];
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const domain = IR[2];
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const encode = IR[3];
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const decode = IR[4];
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const samples = IR[5];
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const size = IR[6];
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const n = IR[7];
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// var mask = IR[8];
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const range = IR[9];
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// Building the cube vertices: its part and sample index
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// http://rjwagner49.com/Mathematics/Interpolation.pdf
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const cubeVertices = 1 << m;
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const cubeVertices = 1 << inputSize;
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const cubeN = new Float64Array(cubeVertices);
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const cubeVertex = new Uint32Array(cubeVertices);
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let i, j;
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@ -332,10 +270,10 @@ const PDFFunction = (function PDFFunctionClosure() {
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cubeN[j] = 1;
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}
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let k = n,
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let k = outputSize,
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pos = 1;
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// Map x_i to y_j for 0 <= i < m using the sampled function.
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for (i = 0; i < m; ++i) {
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for (i = 0; i < inputSize; ++i) {
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// x_i' = min(max(x_i, Domain_2i), Domain_2i+1)
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const domain_2i = domain[i][0];
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const domain_2i_1 = domain[i][1];
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@ -378,7 +316,7 @@ const PDFFunction = (function PDFFunctionClosure() {
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pos <<= 1;
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}
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for (j = 0; j < n; ++j) {
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for (j = 0; j < outputSize; ++j) {
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// Sum all cube vertices' samples portions
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let rj = 0;
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for (i = 0; i < cubeVertices; i++) {
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@ -398,28 +336,18 @@ const PDFFunction = (function PDFFunctionClosure() {
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};
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},
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constructInterpolated({ xref, isEvalSupported, fn, dict }) {
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constructInterpolated({ xref, isEvalSupported, dict }) {
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const c0 = toNumberArray(dict.getArray("C0")) || [0];
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const c1 = toNumberArray(dict.getArray("C1")) || [1];
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const n = dict.get("N");
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const length = c0.length;
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const diff = [];
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for (let i = 0; i < length; ++i) {
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for (let i = 0, ii = c0.length; i < ii; ++i) {
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diff.push(c1[i] - c0[i]);
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}
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return [CONSTRUCT_INTERPOLATED, c0, diff, n];
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},
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constructInterpolatedFromIR({ xref, isEvalSupported, IR }) {
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const c0 = IR[1];
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const diff = IR[2];
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const n = IR[3];
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const length = diff.length;
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return function constructInterpolatedFromIRResult(
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return function constructInterpolatedFn(
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src,
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srcOffset,
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dest,
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@ -433,7 +361,7 @@ const PDFFunction = (function PDFFunctionClosure() {
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};
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},
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constructStiched({ xref, isEvalSupported, fn, dict }) {
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constructStiched({ xref, isEvalSupported, dict }) {
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const domain = toNumberArray(dict.getArray("Domain"));
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if (!domain) {
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@ -455,23 +383,9 @@ const PDFFunction = (function PDFFunctionClosure() {
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const bounds = toNumberArray(dict.getArray("Bounds"));
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const encode = toNumberArray(dict.getArray("Encode"));
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return [CONSTRUCT_STICHED, domain, bounds, encode, fns];
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},
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constructStichedFromIR({ xref, isEvalSupported, IR }) {
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const domain = IR[1];
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const bounds = IR[2];
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const encode = IR[3];
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const fns = IR[4];
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const tmpBuf = new Float32Array(1);
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return function constructStichedFromIRResult(
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src,
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srcOffset,
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dest,
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destOffset
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) {
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return function constructStichedFn(src, srcOffset, dest, destOffset) {
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const clip = function constructStichedFromIRClip(v, min, max) {
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if (v > max) {
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v = max;
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@ -533,14 +447,6 @@ const PDFFunction = (function PDFFunctionClosure() {
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const parser = new PostScriptParser(lexer);
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const code = parser.parse();
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return [CONSTRUCT_POSTSCRIPT, domain, range, code];
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},
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constructPostScriptFromIR({ xref, isEvalSupported, IR }) {
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const domain = IR[1];
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const range = IR[2];
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const code = IR[3];
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if (isEvalSupported && IsEvalSupportedCached.value) {
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const compiled = new PostScriptCompiler().compile(code, domain, range);
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if (compiled) {
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@ -571,12 +477,7 @@ const PDFFunction = (function PDFFunctionClosure() {
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let cache_available = MAX_CACHE_SIZE;
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const tmpBuf = new Float32Array(numInputs);
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return function constructPostScriptFromIRResult(
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src,
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srcOffset,
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dest,
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destOffset
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) {
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return function constructPostScriptFn(src, srcOffset, dest, destOffset) {
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let i, value;
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let key = "";
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const input = tmpBuf;
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