103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
#include <napi.h>
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#include <vips/vips8>
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using namespace std;
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using namespace vips;
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Napi::Value Freeze(const Napi::CallbackInfo &info) {
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Napi::Env env = info.Env();
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try {
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Napi::Object obj = info[0].As<Napi::Object>();
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Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
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bool loop =
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obj.Has("loop") ? obj.Get("loop").As<Napi::Boolean>().Value() : false;
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string type = obj.Get("type").As<Napi::String>().Utf8Value();
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int frame = obj.Has("frame")
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? obj.Get("frame").As<Napi::Number>().Int32Value()
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: -1;
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Napi::Object result = Napi::Object::New(env);
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char *fileData = data.Data();
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char *match = (char *)"\x21\xFF\x0BNETSCAPE2.0\x03\x01";
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char *descriptor = (char *)"\x2C\x00\x00\x00\x00";
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char *lastPos;
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bool none = true;
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if (loop) {
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char *newData = (char *)malloc(data.Length() + 19);
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memcpy(newData, fileData, data.Length());
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lastPos = (char *)memchr(newData, '\x2C', data.Length());
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while (lastPos != NULL) {
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if (memcmp(lastPos, descriptor, 5) != 0) {
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lastPos = (char *)memchr(lastPos + 1, '\x2C',
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(data.Length() - (lastPos - newData)) - 1);
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continue;
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}
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memcpy(lastPos + 19, lastPos, (data.Length() - (lastPos - newData)));
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memcpy(lastPos, match, 16);
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memcpy(lastPos + 16, "\x00\x00\x00", 3);
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result.Set("data",
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Napi::Buffer<char>::Copy(env, newData, data.Length() + 19));
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none = false;
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break;
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}
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if (none)
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result.Set("data",
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Napi::Buffer<char>::Copy(env, newData, data.Length()));
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} else if (frame >= 0 && !loop) {
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in = VImage::new_from_buffer(
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data.Data(), data.Length(), "",
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type == "gif" ? options->set("n", -1) : options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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if (!in.has_alpha()) in = in.bandjoin(255);
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int pageHeight = vips_image_get_page_height(in.get_image());
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int nPages = vips_image_get_n_pages(in.get_image());
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int framePos = clamp(frame, 0, (int)nPages);
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VImage out = in.crop(0, 0, in.width(), pageHeight * (framePos + 1));
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out.set(VIPS_META_PAGE_HEIGHT, pageHeight);
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out.set("loop", loop ? 0 : 1);
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void *buf;
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size_t length;
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out.write_to_buffer(("." + type).c_str(), &buf, &length);
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vips_thread_shutdown();
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result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
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} else {
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lastPos = (char *)memchr(fileData, '\x21', data.Length());
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while (lastPos != NULL) {
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if (memcmp(lastPos, match, 16) != 0) {
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lastPos = (char *)memchr(lastPos + 1, '\x21',
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(data.Length() - (lastPos - fileData)) - 1);
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continue;
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}
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memcpy(lastPos, lastPos + 19,
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(data.Length() - (lastPos - fileData)) - 19);
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result.Set("data",
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Napi::Buffer<char>::Copy(env, fileData, data.Length() - 19));
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none = false;
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break;
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}
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if (none)
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result.Set("data",
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Napi::Buffer<char>::Copy(env, fileData, data.Length()));
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}
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result.Set("type", type);
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return result;
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} catch (std::exception const &err) {
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throw Napi::Error::New(env, err.what());
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} catch (...) {
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throw Napi::Error::New(env, "Unknown error");
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}
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}
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