[TYPO3-mvc] How can I create watermark in my extension?

[Дмитрий Васильев]

Hi all,
To make watermark images in my extension I write

1. In Typoscript
lib.watermark >
lib.watermark = IMAGE
lib.watermark.file = GIFBUILDER
lib.watermark.file {
   XY = 1280,1024
   format = jpg
   quality = 100
   10 = IMAGE
   10 {
     file.import = uploads/tx_myext/
     file.import.current = 1
     file.import.listNum = 0
     file.maxW = 1280
     }
   20 = TEXT
   20 {
     text = {$watermark}
     offset = -5, 300
     angle = 45
     fontFile = fileadmin/fonts/arial.ttf
     fontSize = 16
     }
}

2. In Fluid template
{thumb.image -> f:cObject(typoscriptObjectPath: 'lib.watermark')}

It work good, and generated code <img 
src="typo3temp/GB/watermark-pic.jpg" />
But I need generate code like <a href="typo3temp/GB/watermark-pic.jpg">

For non-watermark image I use
<a href="<f:uri.image src='uploads/tx_myext/{thumb.image}' width='1200' />"

Help me, how can I create watermark in my extension?