I'm using a solution for assembling image files to a zip and streaming it to browser/Flex application. (ZipStream by Paul Duncan, http://pablotron.org/software/zipstream-php/).
Just loading the image files and compressing them works fine. Here's the core for compressing a file:
// Reading the file and converting to string data $stringdata = file_get_contents($imagefile); // Compressing the string data $zdata = gzdeflate($stringdata );
My problem is that I want to process the image using GD before compressing it. Therefore I need a solution for converting the image data (imagecreatefrompng) to string data format:
// Reading the file as GD image data $imagedata = imagecreatefrompng($imagefile); // Do some GD processing: Adding watermarks etc. No problem here... // HOW TO DO THIS??? // convert the $imagedata to $stringdata - PROBLEM! // Compressing the string data $zdata = gzdeflate($stringdata );
Any clues?
One way is to tell GD to output the image, then use PHP buffering to capture it to a string:
$imagedata = imagecreatefrompng($imagefile); ob_start(); imagepng($imagedata); $stringdata = ob_get_contents(); // read from buffer ob_end_clean(); // delete buffer $zdata = gzdeflate($stringdata);
// ob_clean(); // optional ob_start(); imagepng($imagedata); $image = ob_get_clean();
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