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Implemented a faster speed/slow method that doesn't require decoding the GIF

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This commit is contained in:
TheEssem 2021-05-11 23:05:38 -05:00
parent 61758fa3bb
commit e6b4db6e3e
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GPG key ID: A3F9F02129092FCA
1 changed files with 102 additions and 23 deletions
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125
natives/speed.cc
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@ -6,6 +6,13 @@
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();
@ -20,32 +27,64 @@ Napi::Value Speed(const Napi::CallbackInfo &info) {
int speed =
obj.Has("speed") ? obj.Get("speed").As<Napi::Number>().Int32Value() : 2;
Blob blob;
Napi::Object result = Napi::Object::New(env);
list<Image> frames;
readImages(&frames, Blob(data.Data(), data.Length()));
char *fileData = data.Data();
// if passed a delay, use that. otherwise use the average frame delay.
char *match = "\x21\xF9\x04";
// if passed a delay, use that. otherwise iterate over every frame.
if (delay == 0) {
vector<int> old_delays;
vector<uint16_t> old_delays;
bool removeFrames = false;
for (Image &image : frames) {
int animation_delay = image.animationDelay();
old_delays.push_back(animation_delay);
char *lastPos;
int amount = 0;
lastPos = (char *)memchr(fileData, '\x21', data.Length());
while (lastPos != NULL) {
if (memcmp(lastPos, match, 3) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x21',
(data.Length() - (lastPos - fileData)) - 1);
continue;
}
++amount;
uint16_t old_delay;
memcpy(&old_delay, lastPos + 4, 2);
old_delays.push_back(old_delay);
lastPos = (char *)memchr(lastPos + 1, '\x21',
(data.Length() - (lastPos - fileData)) - 1);
}
for (Image &image : frames) {
int old_delay = image.animationDelay();
int new_delay = slow ? old_delay * speed : old_delay / speed;
int currentFrame = 0;
lastPos = (char *)memchr(fileData, '\x21', data.Length());
while (lastPos != NULL) {
if (memcmp(lastPos, match, 3) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x21',
(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;
}
image.animationDelay(new_delay);
image.gifDisposeMethod(Magick::BackgroundDispose);
memset16(lastPos + 4, new_delay, 1);
lastPos = (char *)memchr(lastPos + 1, '\x21',
(data.Length() - (lastPos - fileData)) - 1);
++currentFrame;
}
result.Set("data",
Napi::Buffer<char>::Copy(env, fileData, data.Length()));
if (removeFrames) {
Blob blob;
list<Image> frames;
readImages(&frames, Blob(data.Data(), data.Length()));
for (list<Image>::iterator i = frames.begin(); i != frames.end(); ++i) {
int index = distance(frames.begin(), i);
i->animationDelay(old_delays[index]);
@ -56,27 +95,67 @@ Napi::Value Speed(const Napi::CallbackInfo &info) {
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 {
int new_delay = slow ? delay * speed : delay / speed;
if (!slow && new_delay <= 1) {
char *lastPos;
bool removeFrames = false;
lastPos = (char *)memchr(fileData, '\x21', data.Length());
while (lastPos != NULL) {
if (memcmp(lastPos, match, 3) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x21',
(data.Length() - (lastPos - fileData)) - 1);
continue;
}
uint16_t old_delay;
memcpy(&old_delay, lastPos + 4, 2);
int new_delay = slow ? delay * speed : delay / speed;
if (!slow && new_delay <= 1) {
removeFrames = true;
}
break;
}
if (removeFrames) {
Blob blob;
list<Image> frames;
readImages(&frames, Blob(data.Data(), data.Length()));
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 {
for_each(frames.begin(), frames.end(), animationDelayImage(new_delay));
while (lastPos != NULL) {
if (memcmp(lastPos, match, 3) != 0) {
lastPos =
(char *)memchr(lastPos + 1, '\x21',
(data.Length() - (lastPos - fileData)) - 1);
continue;
}
uint16_t old_delay;
memcpy(&old_delay, lastPos + 4, 2);
int new_delay = slow ? delay * speed : delay / speed;
memset16(lastPos + 4, new_delay, 1);
lastPos = (char *)memchr(lastPos + 1, '\x21',
(data.Length() - (lastPos - fileData)) - 1);
}
}
}
for_each(frames.begin(), frames.end(), magickImage(type));
writeImages(frames.begin(), frames.end(), &blob);
Napi::Object result = Napi::Object::New(env);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
blob.length()));
result.Set("type", type);
return result;
} catch (Napi::Error const &err) {