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-
- //
- // ImageData.cc
- //
- // Copyright (c) 2010 LearnBoost <tj@learnboost.com>
- //
-
- #include "ImageData.h"
-
- Nan::Persistent<FunctionTemplate> ImageData::constructor;
-
- /*
- * Initialize ImageData.
- */
-
- void
- ImageData::Initialize(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target) {
- Nan::HandleScope scope;
-
- // Constructor
- Local<FunctionTemplate> ctor = Nan::New<FunctionTemplate>(ImageData::New);
- constructor.Reset(ctor);
- ctor->InstanceTemplate()->SetInternalFieldCount(1);
- ctor->SetClassName(Nan::New("ImageData").ToLocalChecked());
-
- // Prototype
- Local<ObjectTemplate> proto = ctor->PrototypeTemplate();
- Nan::SetAccessor(proto, Nan::New("width").ToLocalChecked(), GetWidth);
- Nan::SetAccessor(proto, Nan::New("height").ToLocalChecked(), GetHeight);
- Nan::Set(target, Nan::New("ImageData").ToLocalChecked(), ctor->GetFunction());
- }
-
- /*
- * Initialize a new ImageData object.
- */
-
- NAN_METHOD(ImageData::New) {
- if (!info.IsConstructCall()) {
- return Nan::ThrowTypeError("Class constructors cannot be invoked without 'new'");
- }
-
- #if NODE_MAJOR_VERSION == 0 && NODE_MINOR_VERSION <= 10
- Local<v8::Object> clampedArray;
- Local<Object> global = Context::GetCurrent()->Global();
- #else
- Local<Uint8ClampedArray> clampedArray;
- #endif
-
- uint32_t width;
- uint32_t height;
- int length;
-
- if (info[0]->IsUint32() && info[1]->IsUint32()) {
- width = info[0]->Uint32Value();
- if (width == 0) {
- Nan::ThrowRangeError("The source width is zero.");
- return;
- }
- height = info[1]->Uint32Value();
- if (height == 0) {
- Nan::ThrowRangeError("The source height is zero.");
- return;
- }
- length = width * height * 4;
-
- #if NODE_MAJOR_VERSION == 0 && NODE_MINOR_VERSION <= 10
- Local<Int32> sizeHandle = Nan::New(length);
- Local<Value> caargv[] = { sizeHandle };
- clampedArray = global->Get(Nan::New("Uint8ClampedArray").ToLocalChecked()).As<Function>()->NewInstance(1, caargv);
- #else
- clampedArray = Uint8ClampedArray::New(ArrayBuffer::New(Isolate::GetCurrent(), length), 0, length);
- #endif
-
- #if NODE_MAJOR_VERSION == 0 && NODE_MINOR_VERSION <= 10
- } else if (info[0]->ToObject()->GetIndexedPropertiesExternalArrayDataType() == kExternalPixelArray && info[1]->IsUint32()) {
- clampedArray = info[0]->ToObject();
- length = clampedArray->GetIndexedPropertiesExternalArrayDataLength();
- #else
- } else if (info[0]->IsUint8ClampedArray() && info[1]->IsUint32()) {
- clampedArray = info[0].As<Uint8ClampedArray>();
- length = clampedArray->Length();
- #endif
- if (length == 0) {
- Nan::ThrowRangeError("The input data has a zero byte length.");
- return;
- }
- if (length % 4 != 0) {
- Nan::ThrowRangeError("The input data byte length is not a multiple of 4.");
- return;
- }
- width = info[1]->Uint32Value();
- int size = length / 4;
- if (width == 0) {
- Nan::ThrowRangeError("The source width is zero.");
- return;
- }
- if (size % width != 0) {
- Nan::ThrowRangeError("The input data byte length is not a multiple of (4 * width).");
- return;
- }
- height = size / width;
- if (info[2]->IsUint32() && info[2]->Uint32Value() != height) {
- Nan::ThrowRangeError("The input data byte length is not equal to (4 * width * height).");
- return;
- }
- } else {
- Nan::ThrowTypeError("Expected (Uint8ClampedArray, width[, height]) or (width, height)");
- return;
- }
-
- Nan::TypedArrayContents<uint8_t> dataPtr(clampedArray);
-
- ImageData *imageData = new ImageData(reinterpret_cast<uint8_t*>(*dataPtr), width, height);
- imageData->Wrap(info.This());
- info.This()->Set(Nan::New("data").ToLocalChecked(), clampedArray);
- info.GetReturnValue().Set(info.This());
- }
-
- /*
- * Get width.
- */
-
- NAN_GETTER(ImageData::GetWidth) {
- ImageData *imageData = Nan::ObjectWrap::Unwrap<ImageData>(info.This());
- info.GetReturnValue().Set(Nan::New<Number>(imageData->width()));
- }
-
- /*
- * Get height.
- */
-
- NAN_GETTER(ImageData::GetHeight) {
- ImageData *imageData = Nan::ObjectWrap::Unwrap<ImageData>(info.This());
- info.GetReturnValue().Set(Nan::New<Number>(imageData->height()));
- }
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