I am not quite sure how to do quite what I am looking for.
I am trying to use mapnik rendered images in an existing C++ code base.
I have written everything to generate the image and save it to a file:
// Ouptut the image
mapnik::Image32 buf(map.getWidth(), map.getHeight());
mapnik::agg_renderer<mapnik::Image32> ren(map, buf);
ren.apply();
mapnik::save_to_file<mapnik::ImageData32>(buf.data(),
fileName.c_str(), "jpeg");
Which creates my image as a file (and it looks great BTW. I am
extremely pleased with the library's abilities!).
What I need, however, is to get this into a jpeg or png image pointer.
I also need to be able to get the RGB values from each pixel (which I
know how to do if I use GD).
Looking at the viewer program in the demo directory of the mapnik
source, I see using the raw data to create a QImage
QImage image((uchar*)buf.raw_data(),width,height,QImage::Format_ARGB32);
Based on this, I assume the Image32 data is pixel by pixel where the
unsigned value represents the RGB value. Does anyone know how to take
this and create an GD image? I don't think there is a GD constructor to
build from and unsigned array (or am I missing it?).
I know I can write the image to a file (using mapnik's save_to_file) and
read it back in using GD, but I would rather not have to use temporary
files.
I have never really used Qt for anything and I do have GD code scattered
though out my existing code base, so my preference would be to use GD
rather than Qt, but if there is an easy way to get a jpg, png, and RGB
values from the QImage, I will go that way.
Any pointers or ideas would be great. Thanks in advance.
- Brian
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