mrmBot-Matrix/natives/uncaption.cc

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2023-03-15 14:09:09 +00:00
#include <map>
#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
char *Uncaption(string type, string *outType, char *BufferData,
size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
float tolerance = GetArgumentWithFallback<float>(Arguments, "tolerance", 0.5);
VOption *options = VImage::option();
VImage in =
VImage::new_from_buffer(
BufferData, BufferLength, "",
type == "gif" ? options->set("n", -1)->set("access", "sequential")
: options)
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha()) in = in.bandjoin(255);
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
VImage first =
in.crop(0, 0, 3, pageHeight).colourspace(VIPS_INTERPRETATION_B_W) >
(255 * tolerance);
int top, captionWidth, captionHeight;
first.find_trim(&top, &captionWidth, &captionHeight);
vector<VImage> img;
int newHeight = pageHeight - top;
if (top == pageHeight) {
newHeight = pageHeight;
top = 0;
}
for (int i = 0; i < nPages; i++) {
VImage img_frame = in.crop(0, (i * pageHeight) + top, width, newHeight);
img.push_back(img_frame);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, newHeight);
void *buf;
final.write_to_buffer(
("." + *outType).c_str(), &buf, DataSize,
*outType == "gif"
? VImage::option()->set("dither", 0)->set("reoptimise", 1)
: 0);
return (char *)buf;
}