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Expose runtime format availability

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Aids addition of new format/method combos

Dogfood this in the test code
This commit is contained in:
Lovell Fuller
2015-02-26 19:41:33 +00:00
parent 1565522ecc
commit c7ccf6801d
7 changed files with 174 additions and 43 deletions
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1
src/sharp.cc
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@@ -23,6 +23,7 @@ extern "C" void init(v8::Handle<v8::Object> target) {
NODE_SET_METHOD(target, "concurrency", concurrency);
NODE_SET_METHOD(target, "counters", counters);
NODE_SET_METHOD(target, "libvipsVersion", libvipsVersion);
NODE_SET_METHOD(target, "format", format);
}
NODE_MODULE(sharp, init)

64
src/utilities.cc
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@@ -10,6 +10,7 @@ using v8::Local;
using v8::Object;
using v8::Number;
using v8::String;
using v8::Boolean;
using sharp::counterQueue;
using sharp::counterProcess;
@@ -78,3 +79,66 @@ NAN_METHOD(libvipsVersion) {
snprintf(version, sizeof(version), "%d.%d.%d", vips_version(0), vips_version(1), vips_version(2));
NanReturnValue(NanNew<String>(version));
}
/*
Get available input/output file/buffer/stream formats
*/
NAN_METHOD(format) {
NanScope();
// Attribute names
Local<String> attrId = NanNew<String>("id");
Local<String> attrInput = NanNew<String>("input");
Local<String> attrOutput = NanNew<String>("output");
Local<String> attrFile = NanNew<String>("file");
Local<String> attrBuffer = NanNew<String>("buffer");
Local<String> attrStream = NanNew<String>("stream");
// Which load/save operations are available for each compressed format?
Local<Object> format = NanNew<Object>();
for (std::string f : {"jpeg", "png", "webp", "tiff", "magick", "openslide", "dz"}) {
// Input
Local<Object> input = NanNew<Object>();
input->Set(attrFile, NanNew<Boolean>(
vips_type_find("VipsOperation", (f + "load").c_str())));
input->Set(attrBuffer, NanNew<Boolean>(
vips_type_find("VipsOperation", (f + "load_buffer").c_str())));
input->Set(attrStream, input->Get(attrBuffer));
// Output
Local<Object> output = NanNew<Object>();
output->Set(attrFile, NanNew<Boolean>(
vips_type_find("VipsOperation", (f + "save").c_str())));
output->Set(attrBuffer, NanNew<Boolean>(
vips_type_find("VipsOperation", (f + "save_buffer").c_str())));
output->Set(attrStream, output->Get(attrBuffer));
// Other attributes
Local<Object> container = NanNew<Object>();
Local<String> formatId = NanNew<String>(f);
container->Set(attrId, formatId);
container->Set(attrInput, input);
container->Set(attrOutput, output);
// Add to set of formats
format->Set(formatId, container);
}
// Raw, uncompressed data
Local<Object> raw = NanNew<Object>();
raw->Set(attrId, NanNew<String>("raw"));
format->Set(NanNew<String>("raw"), raw);
// No support for raw input yet, so always false
Local<Boolean> unsupported = NanNew<Boolean>(false);
Local<Object> rawInput = NanNew<Object>();
rawInput->Set(attrFile, unsupported);
rawInput->Set(attrBuffer, unsupported);
rawInput->Set(attrStream, unsupported);
raw->Set(attrInput, rawInput);
// Raw output via Buffer/Stream is available in libvips >= 7.42.0
Local<Boolean> supportsRawOutput = NanNew<Boolean>(vips_version(0) >= 8 || (vips_version(0) == 7 && vips_version(1) >= 42));
Local<Object> rawOutput = NanNew<Object>();
rawOutput->Set(attrFile, unsupported);
rawOutput->Set(attrBuffer, supportsRawOutput);
rawOutput->Set(attrStream, supportsRawOutput);
raw->Set(attrOutput, rawOutput);
NanReturnValue(format);
}

1
src/utilities.h
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@@ -7,5 +7,6 @@ NAN_METHOD(cache);
NAN_METHOD(concurrency);
NAN_METHOD(counters);
NAN_METHOD(libvipsVersion);
NAN_METHOD(format);
#endif // SRC_UTILITIES_H_