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Improve performances with image masks (bug 857031)

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- it's the second part of the fix for https://bugzilla.mozilla.org/show_bug.cgi?id=857031;
- some image masks can be used several times but at different positions;
- an image need to be pre-process before to be rendered:
  * rescale it;
  * use the fill color/pattern.
- the two operations above are time consuming so we can cache the generated canvas;
- the cache key is based on the current transform matrix (without the translation part)
  and the current fill color when it isn't a pattern.
- the rendering of the pdf in the above bug is really faster than without this patch.
This commit is contained in:
Calixte Denizet 2022-04-13 15:44:33 +02:00
parent b73a6cc213
commit f62d961dfe
5 changed files with 151 additions and 29 deletions
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23
src/core/evaluator.js
View file

@ -675,6 +675,7 @@ class PartialEvaluator {
width: imgData.width,
height: imgData.height,
interpolate: imgData.interpolate,
count: 1,
},
];
@ -1676,6 +1677,13 @@ class PartialEvaluator {
const localImage = localImageCache.getByName(name);
if (localImage) {
operatorList.addOp(localImage.fn, localImage.args);
if (
localImage.fn === OPS.paintImageMaskXObject &&
localImage.args[0] &&
localImage.args[0].count > 0
) {
localImage.args[0].count++;
}
args = null;
continue;
}
@ -1692,7 +1700,13 @@ class PartialEvaluator {
const localImage = localImageCache.getByRef(xobj);
if (localImage) {
operatorList.addOp(localImage.fn, localImage.args);
if (
localImage.fn === OPS.paintImageMaskXObject &&
localImage.args[0] &&
localImage.args[0].count > 0
) {
localImage.args[0].count++;
}
resolveXObject();
return;
}
@ -1809,6 +1823,13 @@ class PartialEvaluator {
const localImage = localImageCache.getByName(cacheKey);
if (localImage) {
operatorList.addOp(localImage.fn, localImage.args);
if (
localImage.fn === OPS.paintImageMaskXObject &&
localImage.args[0] &&
localImage.args[0].count > 0
) {
localImage.args[0].count++;
}
args = null;
continue;
}

2
src/core/operator_list.js
View file

@ -256,6 +256,8 @@ addState(
data: maskParams.data,
width: maskParams.width,
height: maskParams.height,
interpolate: maskParams.interpolate,
count: maskParams.count,
transform: transformArgs,
});
}