729672 - (CodeHunter) Canvas: Large Texts are not displayed large enough using the fillText Method [fontsize > 4000px]

Status: UNCONFIRMED

(Core :: Layout: Text and Fonts, defect)

Description

[CodeHunter]

Drawing large text on a canvas element with fillText-Method does draw too small text. The text seems to stack it's size somewhere around fontsize 4000-5000px.
Zooming into the text by increasing the fontsize, works up to font size 4000 above the text keeps at it's a certain (max) size and somewhy starts to move toward the bottom, maybe because my site moves it's position because it is expecting the text to be larger.

I would have expected the font to grow, until a dot for example fills the whole screen with a white rectangle. (using white color for my text)

// the given url does not write any text larger than 4900px fontsize
The sourcecode is taken from a googlecode project: http://code.google.com/p/html5-canvas-presentation/

Comment 1

[Boris Zbarsky [:bzbarsky]]

Is this canvas-specific?  I thought we generally capped font sizes to avoid DoS attacks....

Comment 2

[CodeHunter]

Well whereas normal fonts cap at a far smaller size I thought that would be different on canvas.
I don't understand in how far large fonts can cause DoS attacks, however, this means it's a "feature" no bug?

Is there any pretty looking workaround for huge fonts? (Drawing on an image-buffer and scaling that image when drawing it looks really bad)

Comment 4

[colons]

if blink and webkit have a cap on 2d canvas font size, it's much higher than firefox's. if mitigating dos attacks is still a legitimate concern, could raising the limit by a few orders of magnitude be considered?