mrmBot-Matrix/natives/crop.cc

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#include <map>
#include <string>
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#include <vips/vips8>
#include "common.h"
using namespace std;
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using namespace vips;
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char *Crop(string type, string *outType, char *BufferData, size_t BufferLength,
[[maybe_unused]] ArgumentMap Arguments, size_t *DataSize) {
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in =
VImage::new_from_buffer(BufferData, BufferLength, "",
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type == "gif" ? options->set("n", -1) : options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
vector<VImage> img;
int finalHeight = 0;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
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type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
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int frameWidth = img_frame.width();
int frameHeight = img_frame.height();
bool widthOrHeight = frameWidth / frameHeight >= 1;
int size = widthOrHeight ? frameHeight : frameWidth;
// img_frame.crop(frameWidth - size, frameHeight - size, size, size);
VImage result = img_frame.smartcrop(
size, size,
VImage::option()->set("interesting", VIPS_INTERESTING_CENTRE));
finalHeight = size;
img.push_back(result);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, finalHeight);
void *buf;
final.write_to_buffer(
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("." + *outType).c_str(), &buf, DataSize,
*outType == "gif"
? VImage::option()->set("dither", 0)->set("reoptimise", 1)
: 0);
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return (char *)buf;
}