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Merge pull request #16075 from calixteman/svg_filter_hcm

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[api-minor] Use a SVG filter when rendering pages in HCM
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calixteman 2023-03-20 10:18:25 +01:00 • committed by GitHub
commit 3903391f3c
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5 changed files with 181 additions and 85 deletions
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16
web/pdf_page_view.js
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@ -1002,8 +1002,14 @@ class PDFPageView {
// is complete when `!this.renderingQueue`, to prevent black flickering.
canvas.hidden = true;
let isCanvasHidden = true;
const showCanvas = function () {
if (isCanvasHidden) {
const hasHCM = !!(
this.pageColors?.background && this.pageColors?.foreground
);
const showCanvas = function (isLastShow) {
// In HCM, a final filter is applied on the canvas which means that
// before it's applied we've normal colors. Consequently, to avoid to have
// a final flash we just display it once all the drawing is done.
if (isCanvasHidden && (!hasHCM || isLastShow)) {
canvas.hidden = false;
isCanvasHidden = false;
}
@ -1064,7 +1070,7 @@ class PDFPageView {
};
const renderTask = this.pdfPage.render(renderContext);
renderTask.onContinue = function (cont) {
showCanvas();
showCanvas(false);
if (result.onRenderContinue) {
result.onRenderContinue(cont);
} else {
@ -1074,7 +1080,7 @@ class PDFPageView {
renderTask.promise.then(
function () {
showCanvas();
showCanvas(true);
renderCapability.resolve();
},
function (error) {
@ -1082,7 +1088,7 @@ class PDFPageView {
// a black canvas if rendering was cancelled before the `onContinue`-
// callback had been invoked at least once.
if (!(error instanceof RenderingCancelledException)) {
showCanvas();
showCanvas(true);
}
renderCapability.reject(error);
}