Get rid of CSS transform on each annotation in the annotation layer

- each annotation has its coordinates/dimensions expressed in percentage,
  hence it's correctly positioned whatever the scale factor is;
- the font sizes are expressed in percentage too and the main font size
  is scaled thanks a css var (--scale-factor);
- the rotation is now applied on the div annotationLayer;
- this patch improve the rendering of some strings where the glyph spacing
  was not correct (it's a Firefox bug);
- it helps to simplify the code and it should slightly improve the update of
  page (on zoom or rotation).

web/annotation_editor_layer_builder.css

@@ -27,13 +27,14 @@
   position: absolute;
   top: 0;
   left: 0;
+  font-size: calc(100px * var(--scale-factor));
 }
 
 .annotationEditorLayer .freeTextEditor {
   position: absolute;
   background: transparent;
   border-radius: 3px;
-  padding: calc(var(--freetext-padding) * var(--zoom-factor));
+  padding: calc(var(--freetext-padding) * var(--scale-factor));
   resize: none;
   width: auto;
   height: auto;

web/annotation_layer_builder.css

@@ -27,9 +27,30 @@
   }
 }
 
+[data-annotation-rotation="90"] {
+  transform: rotate(90deg) translateY(-100%);
+}
+[data-annotation-rotation="180"] {
+  transform: rotate(180deg) translate(-100%, -100%);
+}
+[data-annotation-rotation="270"] {
+  transform: rotate(270deg) translateX(-100%);
+}
+
+.annotationLayer {
+  position: absolute;
+  top: 0;
+  left: 0;
+  font-size: calc(100px * var(--scale-factor));
+  pointer-events: none;
+  transform-origin: 0 0;
+}
+
 .annotationLayer section {
   position: absolute;
   text-align: initial;
+  pointer-events: auto;
+  box-sizing: border-box;
 }
 
 .annotationLayer .linkAnnotation > a,
@@ -43,10 +64,8 @@
 }
 
 .annotationLayer .buttonWidgetAnnotation.pushButton > canvas {
-  position: relative;
-  top: 0;
-  left: 0;
-  z-index: -1;
+  width: 100%;
+  height: 100%;
 }
 
 .annotationLayer .linkAnnotation > a:hover,
@@ -59,6 +78,8 @@
 .annotationLayer .textAnnotation img {
   position: absolute;
   cursor: pointer;
+  width: 100%;
+  height: 100%;
 }
 
 .annotationLayer .textWidgetAnnotation input,
@@ -69,7 +90,7 @@
   background-image: var(--annotation-unfocused-field-background);
   border: 1px solid transparent;
   box-sizing: border-box;
-  font: 9px sans-serif;
+  font: 9% sans-serif;
   height: 100%;
   margin: 0;
   vertical-align: top;
@@ -186,27 +207,31 @@
 
 .annotationLayer .popupWrapper {
   position: absolute;
-  width: 20em;
+  font-size: calc(9px * var(--scale-factor));
+  width: 100%;
+  min-width: calc(180px * var(--scale-factor));
+  pointer-events: none;
 }
 
 .annotationLayer .popup {
   position: absolute;
   z-index: 200;
-  max-width: 20em;
+  max-width: calc(180px * var(--scale-factor));
   background-color: rgba(255, 255, 153, 1);
-  box-shadow: 0 2px 5px rgba(136, 136, 136, 1);
-  border-radius: 2px;
-  padding: 6px;
-  margin-left: 5px;
+  box-shadow: 0 calc(2px * var(--scale-factor)) calc(5px * var(--scale-factor))
+    rgba(136, 136, 136, 1);
+  border-radius: calc(2px * var(--scale-factor));
+  padding: calc(6px * var(--scale-factor));
+  margin-left: calc(5px * var(--scale-factor));
   cursor: pointer;
   font: message-box;
-  font-size: 9px;
   white-space: normal;
   word-wrap: break-word;
+  pointer-events: auto;
 }
 
 .annotationLayer .popup > * {
-  font-size: 9px;
+  font-size: calc(9px * var(--scale-factor));
 }
 
 .annotationLayer .popup h1 {
@@ -215,17 +240,18 @@
 
 .annotationLayer .popupDate {
   display: inline-block;
-  margin-left: 5px;
+  margin-left: calc(5px * var(--scale-factor));
 }
 
 .annotationLayer .popupContent {
   border-top: 1px solid rgba(51, 51, 51, 1);
-  margin-top: 2px;
-  padding-top: 2px;
+  margin-top: calc(2px * var(--scale-factor));
+  padding-top: calc(2px * var(--scale-factor));
 }
 
 .annotationLayer .richText > * {
   white-space: pre-wrap;
+  font-size: calc(9px * var(--scale-factor));
 }
 
 .annotationLayer .highlightAnnotation,
@@ -244,3 +270,9 @@
 .annotationLayer .fileAttachmentAnnotation {
   cursor: pointer;
 }
+
+.annotationLayer section svg {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+}

web/annotation_layer_builder.js

@@ -117,11 +117,14 @@ class AnnotationLayerBuilder {
     if (this.div) {
       // If an annotationLayer already exists, refresh its children's
       // transformation matrices.
+      AnnotationLayer.setDimensions(this.div, viewport);
       AnnotationLayer.update(parameters);
     } else {
       // Create an annotation layer div and render the annotations
       // if there is at least one annotation.
       this.div = document.createElement("div");
+      AnnotationLayer.setDimensions(this.div, viewport);
+
       this.div.className = "annotationLayer";
       this.pageDiv.append(this.div);
       parameters.div = this.div;

web/base_viewer.js

@@ -1048,7 +1048,10 @@ class BaseViewer {
       return;
     }
 
-    docStyle.setProperty("--zoom-factor", newScale);
+    docStyle.setProperty(
+      "--scale-factor",
+      newScale * PixelsPerInch.PDF_TO_CSS_UNITS
+    );
 
     const updateArgs = { scale: newScale };
     for (const pageView of this._pages) {

web/pdf_page_view.js

@@ -377,7 +377,7 @@ class PDFPageView {
     });
 
     if (this._isStandalone) {
-      docStyle.setProperty("--zoom-factor", this.scale);
+      docStyle.setProperty("--scale-factor", this.viewport.scale);
     }
 
     if (this.svg) {

web/pdf_viewer.css

@@ -23,7 +23,7 @@
   --page-margin: 1px auto -8px;
   --page-border: 9px solid transparent;
   --spreadHorizontalWrapped-margin-LR: -3.5px;
-  --zoom-factor: 1;
+  --scale-factor: 1;
 }
 
 @media screen and (forced-colors: active) {