<html><head><title></title><style type="text/css"></style></head><body><div style="font-family: Arial; font-size: medium;" dir="ltr"><div>I am using the cairo_surface_write_to_png_stream() function to</div> <div>write a PNG stream to an allocated buffer - usually successfully.</div> <div> </div> <div>The result will be an exact number of bytes, literally representing</div> <div>the generated PNG image in memory, as if it is a file. I can then</div> <div>write this stream of bytes to a database or elsewhere.</div> <div> </div> <div>Problem is, the custom write function does not know the actual</div> <div>size of the buffer to allocate in advance, which of course would</div> <div>be the size of the PNG stream AFTER it has been created from</div> <div>the current cairo surface and context.</div> <div> </div> <div>As a result, if I don't allocate enough space for the final image</div> <div>stream, the write function returns an error.</div> <div> </div> <div>i.e, I have to guess a sufficiently large buffer size - which does not</div> <div>lend itself to a flexible program.</div> <div> </div> <div>So how do we find the number of bytes that an image surface will</div> <div>contain, BEFORE writing it to a PNG stream??</div> <div> </div> <div>This would round off a spectacular vector drawing API.</div> <div> </div> <div>Thanks in advance if anyone can help.</div> <div> </div></div></body></html>