mrmBot-Matrix/natives/speed.cc

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#include <Magick++.h>
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#include <napi.h>
#include <iostream>
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#include <list>
using namespace std;
using namespace Magick;
void *memset16(void *m, uint16_t val, size_t count) {
uint16_t *buf = (uint16_t *)m;
while (count--) *buf++ = val;
return m;
}
Napi::Value Speed(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
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try {
Napi::Object obj = info[0].As<Napi::Object>();
Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
bool slow =
obj.Has("slow") ? obj.Get("slow").As<Napi::Boolean>().Value() : false;
string type = obj.Get("type").As<Napi::String>().Utf8Value();
int delay =
obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
int speed =
obj.Has("speed") ? obj.Get("speed").As<Napi::Number>().Int32Value() : 2;
Napi::Object result = Napi::Object::New(env);
char *fileData = data.Data();
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char *match = "\x00\x21\xF9\x04";
// if passed a delay, use that. otherwise iterate over every frame.
if (delay == 0) {
vector<uint16_t> old_delays;
bool removeFrames = false;
char *lastPos;
int amount = 0;
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lastPos = (char *)memchr(fileData, '\x00', data.Length());
while (lastPos != NULL) {
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if (memcmp(lastPos, match, 4) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x00',
(data.Length() - (lastPos - fileData)) - 1);
continue;
}
++amount;
uint16_t old_delay;
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memcpy(&old_delay, lastPos + 5, 2);
old_delays.push_back(old_delay);
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lastPos = (char *)memchr(lastPos + 1, '\x00',
(data.Length() - (lastPos - fileData)) - 1);
}
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int currentFrame = 0;
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lastPos = (char *)memchr(fileData, '\x00', data.Length());
while (lastPos != NULL) {
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if (memcmp(lastPos, match, 4) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x00',
(data.Length() - (lastPos - fileData)) - 1);
continue;
}
uint16_t new_delay = slow ? old_delays[currentFrame] * speed
: old_delays[currentFrame] / speed;
if (!slow && new_delay <= 1) {
removeFrames = true;
break;
}
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memset16(lastPos + 5, new_delay, 1);
lastPos = (char *)memchr(lastPos + 1, '\x00',
(data.Length() - (lastPos - fileData)) - 1);
++currentFrame;
}
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result.Set("data",
Napi::Buffer<char>::Copy(env, fileData, data.Length()));
if (removeFrames) {
Blob blob;
list<Image> frames;
try {
readImages(&frames, Blob(data.Data(), data.Length()));
} catch (Magick::WarningCoder &warning) {
cerr << "Coder Warning: " << warning.what() << endl;
} catch (Magick::Warning &warning) {
cerr << "Warning: " << warning.what() << endl;
}
for (list<Image>::iterator i = frames.begin(); i != frames.end(); ++i) {
int index = distance(frames.begin(), i);
i->animationDelay(old_delays[index]);
}
for (int i = 0; i < speed - 1; ++i) {
frames.remove_if([counter = 0](const auto x) mutable {
return ++counter % 2 == 0;
});
}
for_each(frames.begin(), frames.end(), magickImage(type));
writeImages(frames.begin(), frames.end(), &blob);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
blob.length()));
}
} else {
char *lastPos;
bool removeFrames = false;
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lastPos = (char *)memchr(fileData, '\x00', data.Length());
while (lastPos != NULL) {
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if (memcmp(lastPos, match, 4) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x00',
(data.Length() - (lastPos - fileData)) - 1);
continue;
}
uint16_t old_delay;
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memcpy(&old_delay, lastPos + 5, 2);
int new_delay = slow ? delay * speed : delay / speed;
if (!slow && new_delay <= 1) {
removeFrames = true;
}
break;
}
if (removeFrames) {
Blob blob;
list<Image> frames;
try {
readImages(&frames, Blob(data.Data(), data.Length()));
} catch (Magick::WarningCoder &warning) {
cerr << "Coder Warning: " << warning.what() << endl;
} catch (Magick::Warning &warning) {
cerr << "Warning: " << warning.what() << endl;
}
for (int i = 0; i < speed - 1; ++i) {
frames.remove_if([counter = 0](const auto x) mutable {
return ++counter % 2 == 0;
});
}
for_each(frames.begin(), frames.end(), magickImage(type));
writeImages(frames.begin(), frames.end(), &blob);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
blob.length()));
} else {
while (lastPos != NULL) {
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if (memcmp(lastPos, match, 4) != 0) {
lastPos =
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(char *)memchr(lastPos + 1, '\x00',
(data.Length() - (lastPos - fileData)) - 1);
continue;
}
uint16_t old_delay;
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memcpy(&old_delay, lastPos + 5, 2);
int new_delay = slow ? delay * speed : delay / speed;
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memset16(lastPos + 5, new_delay, 1);
lastPos = (char *)memchr(lastPos + 1, '\x00',
(data.Length() - (lastPos - fileData)) - 1);
}
}
}
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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");
}
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}