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Add basic support for transparency groups.

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This commit is contained in:
Brendan Dahl 2013-03-12 17:20:38 -07:00
parent 3f195f3308
commit 725cd5407f
6 changed files with 2318 additions and 26 deletions
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77
src/evaluator.js
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@ -244,6 +244,60 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
return loadedName;
}
function buildFormXObject(xobj, smask) {
var matrix = xobj.dict.get('Matrix');
var bbox = xobj.dict.get('BBox');
var group = xobj.dict.get('Group');
if (group) {
var groupOptions = {
matrix: matrix,
bbox: bbox,
smask: !!smask,
isolated: false,
knockout: false
};
var groupSubtype = group.get('S');
if (isName(groupSubtype) && groupSubtype.name === 'Transparency') {
groupOptions.isolated = group.get('I') || false;
groupOptions.knockout = group.get('K') || false;
// There is also a group colorspace, but since we put everything in
// RGB I'm not sure we need it.
}
fnArray.push('beginGroup');
argsArray.push([groupOptions]);
}
fnArray.push('paintFormXObjectBegin');
argsArray.push([matrix, bbox]);
// This adds the operatorList of the xObj to the current queue.
var depIdx = dependencyArray.length;
// Pass in the current `queue` object. That means the `fnArray`
// and the `argsArray` in this scope is reused and new commands
// are added to them.
self.getOperatorList(xobj,
xobj.dict.get('Resources') || resources,
dependencyArray, queue);
self.getOperatorList(xobj,
xobj.dict.get('Resources') || resources,
dependencyArray, queue);
// Add the dependencies that are required to execute the
// operatorList.
insertDependency(dependencyArray.slice(depIdx));
fnArray.push('paintFormXObjectEnd');
argsArray.push([]);
if (group) {
fnArray.push('endGroup');
argsArray.push([groupOptions]);
}
}
function buildPaintImageXObject(image, inline) {
var dict = image.dict;
var w = dict.get('Width', 'W');
@ -417,28 +471,9 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
);
if ('Form' == type.name) {
var matrix = xobj.dict.get('Matrix');
var bbox = xobj.dict.get('BBox');
fnArray.push('paintFormXObjectBegin');
argsArray.push([matrix, bbox]);
// This adds the operatorList of the xObj to the current queue.
var depIdx = dependencyArray.length;
// Pass in the current `queue` object. That means the `fnArray`
// and the `argsArray` in this scope is reused and new commands
// are added to them.
this.getOperatorList(xobj,
xobj.dict.get('Resources') || resources,
dependencyArray, queue);
// Add the dependencies that are required to execute the
// operatorList.
insertDependency(dependencyArray.slice(depIdx));
fn = 'paintFormXObjectEnd';
buildFormXObject(xobj);
args = [];
continue;
} else if ('Image' == type.name) {
buildPaintImageXObject(xobj, false);
} else {