Black text not visible #5291

Issue #5291 black text not visible

Optimized code

src/display/canvas.js

@@ -26,6 +26,8 @@
 
 // Minimal font size that would be used during canvas fillText operations.
 var MIN_FONT_SIZE = 16;
+// Maximum font size that would be used during canvas fillText operations.
+var MAX_FONT_SIZE = 50;
 var MAX_GROUP_SIZE = 4096;
 
 var COMPILE_TYPE3_GLYPHS = true;
@@ -1226,8 +1228,9 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       // Keeping the font at minimal size and using the fontSizeScale to change
       // the current transformation matrix before the fillText/strokeText.
       // See https://bugzilla.mozilla.org/show_bug.cgi?id=726227
-      var browserFontSize = size >= MIN_FONT_SIZE ? size : MIN_FONT_SIZE;
-      this.current.fontSizeScale = browserFontSize !== MIN_FONT_SIZE ? 1.0 :
+      var browserFontSize = size < MIN_FONT_SIZE ? MIN_FONT_SIZE : 
+                            size > MAX_FONT_SIZE ? MAX_FONT_SIZE : size;
+      this.current.fontSizeScale = browserFontSize === size ? 1.0 :
                                    size / MIN_FONT_SIZE;
 
       var rule = italic + ' ' + bold + ' ' + browserFontSize + 'px ' + typeface;