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Adds transfer function support for SMask.

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This commit is contained in:
Yury Delendik 2015-12-04 12:52:45 -06:00
parent d4843ebf6d
commit 15c9969abe
5 changed files with 38 additions and 10 deletions
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19
src/core/evaluator.js
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@ -20,7 +20,8 @@
stdFontMap, symbolsFonts, getTilingPatternIR, warn, Util, Promise,
RefSetCache, isRef, TextRenderingMode, IdentityToUnicodeMap,
OPS, UNSUPPORTED_FEATURES, NormalizedUnicodes, IDENTITY_MATRIX,
reverseIfRtl, createPromiseCapability, ToUnicodeMap, getFontType */
reverseIfRtl, createPromiseCapability, ToUnicodeMap, getFontType,
isPDFFunction, PDFFunction */
'use strict';
@ -274,6 +275,22 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
subtype: smask.get('S').name,
backdrop: smask.get('BC')
};
// The SMask might have a alpha/luminosity value transfer function --
// we will build a map of integer values in range 0..255 to be fast.
var transferObj = smask.get('TR');
if (isPDFFunction(transferObj)) {
var transferFn = PDFFunction.parse(this.xref, transferObj);
var transferMap = new Uint8Array(256);
var tmp = new Float32Array(1);
for (var i = 0; i < 255; i++) {
tmp[0] = i / 255;
transferFn(tmp, 0, tmp, 0);
transferMap[i] = (tmp[0] * 255) | 0;
}
smaskOptions.transferMap = transferMap;
}
return this.buildFormXObject(resources, smaskContent, smaskOptions,
operatorList, task, stateManager.state.clone());
},