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Normalize blend mode names.

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This commit is contained in:
Brendan Dahl 2017-04-10 11:58:02 -07:00
parent c5199d0814
commit 4969b2ad97
5 changed files with 134 additions and 17 deletions
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46
src/core/evaluator.js
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@ -217,6 +217,50 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
}
};
// Convert PDF blend mode names to HTML5 blend mode names.
function normalizeBlendMode(value) {
if (!isName(value)) {
return 'source-over';
}
switch (value.name) {
case 'Normal':
case 'Compatible':
return 'source-over';
case 'Multiply':
return 'multiply';
case 'Screen':
return 'screen';
case 'Overlay':
return 'overlay';
case 'Darken':
return 'darken';
case 'Lighten':
return 'lighten';
case 'ColorDodge':
return 'color-dodge';
case 'ColorBurn':
return 'color-burn';
case 'HardLight':
return 'hard-light';
case 'SoftLight':
return 'soft-light';
case 'Difference':
return 'difference';
case 'Exclusion':
return 'exclusion';
case 'Hue':
return 'hue';
case 'Saturation':
return 'saturation';
case 'Color':
return 'color';
case 'Luminosity':
return 'luminosity';
}
warn('Unsupported blend mode: ' + value.name);
return 'source-over';
}
var deferred = Promise.resolve();
var TILING_PATTERN = 1, SHADING_PATTERN = 2;
@ -606,7 +650,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
});
break;
case 'BM':
gStateObj.push([key, value]);
gStateObj.push([key, normalizeBlendMode(value)]);
break;
case 'SMask':
if (isName(value, 'None')) {