107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
#include <Magick++.h>
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#include <napi.h>
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#include <iostream>
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#include <list>
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using namespace std;
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using namespace Magick;
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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 delay =
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obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
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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 = "\x21\xFF\x0BNETSCAPE2.0\x03\x01";
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char *descriptor = "\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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Blob blob;
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list<Image> frames;
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try {
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readImages(&frames, Blob(data.Data(), data.Length()));
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} catch (Magick::WarningCoder &warning) {
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cerr << "Coder Warning: " << warning.what() << endl;
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} catch (Magick::Warning &warning) {
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cerr << "Warning: " << warning.what() << endl;
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}
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size_t frameSize = frames.size();
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int framePos = clamp(frame, 0, (int)frameSize);
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frames.resize(framePos + 1);
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for_each(frames.begin(), frames.end(),
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animationIterationsImage(loop ? 0 : 1));
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for_each(frames.begin(), frames.end(), magickImage(type));
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if (delay != 0)
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for_each(frames.begin(), frames.end(), animationDelayImage(delay));
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writeImages(frames.begin(), frames.end(), &blob);
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result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
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blob.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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} |