68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
#include <napi.h>
|
|
|
|
#include <vips/vips8>
|
|
|
|
using namespace std;
|
|
using namespace vips;
|
|
|
|
Napi::Value Uncaption(const Napi::CallbackInfo &info) {
|
|
Napi::Env env = info.Env();
|
|
|
|
try {
|
|
Napi::Object obj = info[0].As<Napi::Object>();
|
|
Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
|
|
float tolerance = obj.Has("tolerance")
|
|
? obj.Get("tolerance").As<Napi::Number>().FloatValue()
|
|
: 0.5;
|
|
string type = obj.Get("type").As<Napi::String>().Utf8Value();
|
|
|
|
VOption *options = VImage::option();
|
|
|
|
VImage in =
|
|
VImage::new_from_buffer(data.Data(), data.Length(), "",
|
|
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;
|
|
size_t length;
|
|
final.write_to_buffer(
|
|
("." + type).c_str(), &buf, &length,
|
|
type == "gif" ? VImage::option()->set("dither", 0)->set("reoptimise", 1) : 0);
|
|
|
|
vips_thread_shutdown();
|
|
|
|
Napi::Object result = Napi::Object::New(env);
|
|
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
|
|
result.Set("type", type);
|
|
return result;
|
|
} catch (std::exception const &err) {
|
|
throw Napi::Error::New(env, err.what());
|
|
} catch (...) {
|
|
throw Napi::Error::New(env, "Unknown error");
|
|
}
|
|
}
|