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Improve performance of reused patterns.

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Bug 1721218 has a shading pattern that was used thousands of times.
To improve performance of this PDF:
 - add a cache for patterns in the evaluator and only send the IR form once
   to the main thread (this also makes caching in canvas easier)
 - cache the created canvas radial/axial patterns
 - for shading fill radial/axial use the pattern directly instead of creating temporary
   canvas
This commit is contained in:
Brendan Dahl 2021-07-21 12:27:39 -07:00
parent 2cf90cd9ad
commit da1af02ac8
7 changed files with 121 additions and 59 deletions
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70
src/core/evaluator.js
View file

@ -1314,6 +1314,35 @@ class PartialEvaluator {
});
}
parseShading({
keyObj,
shading,
resources,
localColorSpaceCache,
localShadingPatternCache,
matrix = null,
}) {
// Shadings and patterns may be referenced by the same name but the resource
// dictionary could be different so we can't use the name for the cache key.
let id = localShadingPatternCache.get(keyObj);
if (!id) {
var shadingFill = Pattern.parseShading(
shading,
matrix,
this.xref,
resources,
this.handler,
this._pdfFunctionFactory,
localColorSpaceCache
);
const patternIR = shadingFill.getIR();
id = `pattern_${this.idFactory.createObjId()}`;
localShadingPatternCache.set(keyObj, id);
this.handler.send("obj", [id, this.pageIndex, "Pattern", patternIR]);
}
return id;
}
handleColorN(
operatorList,
fn,
@ -1323,7 +1352,8 @@ class PartialEvaluator {
resources,
task,
localColorSpaceCache,
localTilingPatternCache
localTilingPatternCache,
localShadingPatternCache
) {
// compile tiling patterns
const patternName = args.pop();
@ -1350,7 +1380,7 @@ class PartialEvaluator {
// if and only if there are PDF documents where doing so would
// significantly improve performance.
let pattern = patterns.get(name);
const pattern = patterns.get(name);
if (pattern) {
const dict = isStream(pattern) ? pattern.dict : pattern;
const typeNum = dict.get("PatternType");
@ -1371,16 +1401,15 @@ class PartialEvaluator {
} else if (typeNum === PatternType.SHADING) {
const shading = dict.get("Shading");
const matrix = dict.getArray("Matrix");
pattern = Pattern.parseShading(
const objId = this.parseShading({
keyObj: pattern,
shading,
matrix,
this.xref,
resources,
this.handler,
this._pdfFunctionFactory,
localColorSpaceCache
);
operatorList.addOp(fn, pattern.getIR());
localColorSpaceCache,
localShadingPatternCache,
});
operatorList.addOp(fn, ["Shading", objId]);
return undefined;
}
throw new FormatError(`Unknown PatternType: ${typeNum}`);
@ -1513,6 +1542,7 @@ class PartialEvaluator {
const localColorSpaceCache = new LocalColorSpaceCache();
const localGStateCache = new LocalGStateCache();
const localTilingPatternCache = new LocalTilingPatternCache();
const localShadingPatternCache = new Map();
const xobjs = resources.get("XObject") || Dict.empty;
const patterns = resources.get("Pattern") || Dict.empty;
@ -1869,7 +1899,8 @@ class PartialEvaluator {
resources,
task,
localColorSpaceCache,
localTilingPatternCache
localTilingPatternCache,
localShadingPatternCache
)
);
return;
@ -1890,7 +1921,8 @@ class PartialEvaluator {
resources,
task,
localColorSpaceCache,
localTilingPatternCache
localTilingPatternCache,
localShadingPatternCache
)
);
return;
@ -1909,18 +1941,14 @@ class PartialEvaluator {
if (!shading) {
throw new FormatError("No shading object found");
}
var shadingFill = Pattern.parseShading(
const patternId = self.parseShading({
keyObj: shading,
shading,
null,
xref,
resources,
self.handler,
self._pdfFunctionFactory,
localColorSpaceCache
);
var patternIR = shadingFill.getIR();
args = [patternIR];
localColorSpaceCache,
localShadingPatternCache,
});
args = [patternId];
fn = OPS.shadingFill;
break;
case OPS.setGState: