从 memory ImageMagick 解码 svg

Question

How do I decode svg image from buffer? I know SVGs are just text but I don't know how to parse them to Magick::Image other than reading from disk.

#include <Magick++.h>
#include <stdio.h>
using namespace Magick;

int main() {
    printf("EnableOpenCL ret: %d\n", Magick::EnableOpenCL());
    Magick::Image svgImage;
    svgImage.read("input.svg"); // first read file
    svgImage.magick("png"); // then specify PNG format
    svgImage.write("output.png");
    return 0;
}

Answer 1

You would copy the buffer into Magick++'s Magick::Blob and pass it to Magick::Image constructor.

Magick::Blob svgData(memory_ptr, memory_length);
Magick::Image svgImage(svgData, svgRenderSize, "SVG");

Where memory_ptr is the address of the svg data in memory, memory_length is the total byte size of memory_ptr , and svgRenderSize is Magick::Geometry instances the image size.