| /* |
| * Copyright 2013 Google Inc. |
| * |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| */ |
| #include <v8.h> |
| |
| using namespace v8; |
| |
| #include "SkV8Example.h" |
| |
| #include "gl/GrGLUtil.h" |
| #include "gl/GrGLDefines.h" |
| #include "gl/GrGLInterface.h" |
| #include "SkApplication.h" |
| #include "SkDraw.h" |
| #include "SkGpuDevice.h" |
| #include "SkGraphics.h" |
| |
| |
| void application_init() { |
| SkGraphics::Init(); |
| SkEvent::Init(); |
| } |
| |
| void application_term() { |
| SkEvent::Term(); |
| SkGraphics::Term(); |
| } |
| |
| // Extracts a C string from a V8 Utf8Value. |
| const char* ToCString(const v8::String::Utf8Value& value) { |
| return *value ? *value : "<string conversion failed>"; |
| } |
| |
| // Slight modification to an original function found in the V8 sample shell.cc. |
| void reportException(Isolate* isolate, TryCatch* try_catch) { |
| HandleScope handleScope(isolate); |
| String::Utf8Value exception(try_catch->Exception()); |
| const char* exception_string = ToCString(exception); |
| Handle<Message> message = try_catch->Message(); |
| if (message.IsEmpty()) { |
| // V8 didn't provide any extra information about this error; just |
| // print the exception. |
| fprintf(stderr, "%s\n", exception_string); |
| } else { |
| // Print (filename):(line number): (message). |
| String::Utf8Value filename(message->GetScriptResourceName()); |
| const char* filename_string = ToCString(filename); |
| int linenum = message->GetLineNumber(); |
| fprintf(stderr, |
| "%s:%i: %s\n", filename_string, linenum, exception_string); |
| // Print line of source code. |
| String::Utf8Value sourceline(message->GetSourceLine()); |
| const char* sourceline_string = ToCString(sourceline); |
| fprintf(stderr, "%s\n", sourceline_string); |
| // Print wavy underline. |
| int start = message->GetStartColumn(); |
| for (int i = 0; i < start; i++) { |
| fprintf(stderr, " "); |
| } |
| int end = message->GetEndColumn(); |
| for (int i = start; i < end; i++) { |
| fprintf(stderr, "^"); |
| } |
| fprintf(stderr, "\n"); |
| String::Utf8Value stack_trace(try_catch->StackTrace()); |
| if (stack_trace.length() > 0) { |
| const char* stack_trace_string = ToCString(stack_trace); |
| fprintf(stderr, "%s\n", stack_trace_string); |
| } |
| } |
| } |
| |
| SkV8ExampleWindow::SkV8ExampleWindow(void* hwnd, JsCanvas* canvas) |
| : INHERITED(hwnd) |
| , fJsCanvas(canvas) |
| { |
| fRotationAngle = SkIntToScalar(0); |
| this->setConfig(SkBitmap::kARGB_8888_Config); |
| this->setVisibleP(true); |
| this->setClipToBounds(false); |
| } |
| |
| JsCanvas* JsCanvas::unwrap(Handle<Object> obj) { |
| Handle<External> field = Handle<External>::Cast(obj->GetInternalField(0)); |
| void* ptr = field->Value(); |
| return static_cast<JsCanvas*>(ptr); |
| } |
| |
| void JsCanvas::inval(const v8::FunctionCallbackInfo<Value>& args) { |
| unwrap(args.This())->fWindow->inval(NULL); |
| } |
| |
| void JsCanvas::drawRect(const v8::FunctionCallbackInfo<Value>& args) { |
| SkCanvas* canvas = unwrap(args.This())->fCanvas; |
| |
| canvas->drawColor(SK_ColorWHITE); |
| |
| // Draw a rectangle with red paint. |
| SkPaint paint; |
| paint.setColor(SK_ColorRED); |
| SkRect rect = { |
| SkIntToScalar(10), SkIntToScalar(10), |
| SkIntToScalar(128), SkIntToScalar(128) |
| }; |
| canvas->drawRect(rect, paint); |
| } |
| |
| Persistent<ObjectTemplate> JsCanvas::fCanvasTemplate; |
| |
| Handle<ObjectTemplate> JsCanvas::makeCanvasTemplate() { |
| EscapableHandleScope handleScope(fIsolate); |
| |
| Local<ObjectTemplate> result = ObjectTemplate::New(); |
| |
| // Add a field to store the pointer to a JsCanvas instance. |
| result->SetInternalFieldCount(1); |
| |
| // Add accessors for each of the fields of the canvas object. |
| result->Set( |
| String::NewFromUtf8( |
| fIsolate, "drawRect", String::kInternalizedString), |
| FunctionTemplate::New(drawRect)); |
| result->Set( |
| String::NewFromUtf8( |
| fIsolate, "inval", String::kInternalizedString), |
| FunctionTemplate::New(inval)); |
| |
| // Return the result through the current handle scope. |
| return handleScope.Escape(result); |
| } |
| |
| |
| // Wraps 'this' in a Javascript object. |
| Handle<Object> JsCanvas::wrap() { |
| // Handle scope for temporary handles. |
| EscapableHandleScope handleScope(fIsolate); |
| |
| // Fetch the template for creating JavaScript JsCanvas wrappers. |
| // It only has to be created once, which we do on demand. |
| if (fCanvasTemplate.IsEmpty()) { |
| Handle<ObjectTemplate> raw_template = this->makeCanvasTemplate(); |
| fCanvasTemplate.Reset(fIsolate, raw_template); |
| } |
| Handle<ObjectTemplate> templ = |
| Local<ObjectTemplate>::New(fIsolate, fCanvasTemplate); |
| |
| // Create an empty JsCanvas wrapper. |
| Local<Object> result = templ->NewInstance(); |
| |
| // Wrap the raw C++ pointer in an External so it can be referenced |
| // from within JavaScript. |
| Handle<External> canvasPtr = External::New(fIsolate, this); |
| |
| // Store the canvas pointer in the JavaScript wrapper. |
| result->SetInternalField(0, canvasPtr); |
| |
| // Return the result through the current handle scope. Since each |
| // of these handles will go away when the handle scope is deleted |
| // we need to call Close to let one, the result, escape into the |
| // outer handle scope. |
| return handleScope.Escape(result); |
| } |
| |
| void JsCanvas::onDraw(SkCanvas* canvas, SkOSWindow* window) { |
| // Record canvas and window in this. |
| fCanvas = canvas; |
| fWindow = window; |
| |
| // Create a handle scope to keep the temporary object references. |
| HandleScope handleScope(fIsolate); |
| |
| // Create a local context from our global context. |
| Local<Context> context = Local<Context>::New(fIsolate, fContext); |
| |
| // Enter the context so all the remaining operations take place there. |
| Context::Scope contextScope(context); |
| |
| // Wrap the C++ this pointer in a JavaScript wrapper. |
| Handle<Object> canvasObj = this->wrap(); |
| |
| // Set up an exception handler before calling the Process function. |
| TryCatch tryCatch; |
| |
| // Invoke the process function, giving the global object as 'this' |
| // and one argument, this JsCanvas. |
| const int argc = 1; |
| Handle<Value> argv[argc] = { canvasObj }; |
| Local<Function> onDraw = |
| Local<Function>::New(fIsolate, fOnDraw); |
| Handle<Value> result = onDraw->Call(context->Global(), argc, argv); |
| |
| // Handle any exceptions or output. |
| if (result.IsEmpty()) { |
| SkASSERT(tryCatch.HasCaught()); |
| // Print errors that happened during execution. |
| reportException(fIsolate, &tryCatch); |
| } else { |
| SkASSERT(!tryCatch.HasCaught()); |
| if (!result->IsUndefined()) { |
| // If all went well and the result wasn't undefined then print |
| // the returned value. |
| String::Utf8Value str(result); |
| const char* cstr = ToCString(str); |
| printf("%s\n", cstr); |
| } |
| } |
| } |
| |
| void SkV8ExampleWindow::onDraw(SkCanvas* canvas) { |
| |
| canvas->save(); |
| |
| fRotationAngle += SkDoubleToScalar(0.2); |
| if (fRotationAngle > SkDoubleToScalar(360.0)) { |
| fRotationAngle -= SkDoubleToScalar(360.0); |
| } |
| |
| canvas->rotate(fRotationAngle); |
| |
| // Now jump into JS and call the onDraw(canvas) method defined there. |
| fJsCanvas->onDraw(canvas, this); |
| |
| canvas->restore(); |
| |
| INHERITED::onDraw(canvas); |
| } |
| |
| |
| #ifdef SK_BUILD_FOR_WIN |
| void SkV8ExampleWindow::onHandleInval(const SkIRect& rect) { |
| RECT winRect; |
| winRect.top = rect.top(); |
| winRect.bottom = rect.bottom(); |
| winRect.right = rect.right(); |
| winRect.left = rect.left(); |
| InvalidateRect((HWND)this->getHWND(), &winRect, false); |
| } |
| #endif |
| |
| // Creates a new execution environment containing the built-in |
| // function draw(). |
| Handle<Context> createRootContext(Isolate* isolate) { |
| // Create a template for the global object. |
| Handle<ObjectTemplate> global = ObjectTemplate::New(); |
| |
| // This is where we would inject any globals into the root Context |
| // using global->Set(...) |
| |
| return Context::New(isolate, NULL, global); |
| } |
| |
| |
| // Parse and run script. Then fetch out the onDraw function from the global |
| // object. |
| bool JsCanvas::initialize(const char script[]) { |
| |
| // Create a stack-allocated handle scope. |
| HandleScope handleScope(fIsolate); |
| |
| printf("Before create context\n"); |
| |
| // Create a new context. |
| Handle<Context> context = createRootContext(fIsolate); |
| |
| // Enter the scope so all operations take place in the scope. |
| Context::Scope contextScope(context); |
| |
| v8::TryCatch try_catch; |
| |
| // Compile the source code. |
| Handle<String> source = String::NewFromUtf8(fIsolate, script); |
| printf("Before Compile\n"); |
| Handle<Script> compiled_script = Script::Compile(source); |
| printf("After Compile\n"); |
| |
| if (compiled_script.IsEmpty()) { |
| // Print errors that happened during compilation. |
| reportException(fIsolate, &try_catch); |
| return false; |
| } |
| printf("After Exception.\n"); |
| |
| // Try running it now to create the onDraw function. |
| Handle<Value> result = compiled_script->Run(); |
| |
| // Handle any exceptions or output. |
| if (result.IsEmpty()) { |
| SkASSERT(try_catch.HasCaught()); |
| // Print errors that happened during execution. |
| reportException(fIsolate, &try_catch); |
| return false; |
| } else { |
| SkASSERT(!try_catch.HasCaught()); |
| if (!result->IsUndefined()) { |
| // If all went well and the result wasn't undefined then print |
| // the returned value. |
| String::Utf8Value str(result); |
| const char* cstr = ToCString(str); |
| printf("%s\n", cstr); |
| return false; |
| } |
| } |
| |
| Handle<String> fn_name = String::NewFromUtf8(fIsolate, "onDraw"); |
| Handle<Value> fn_val = context->Global()->Get(fn_name); |
| |
| if (!fn_val->IsFunction()) { |
| return false; |
| } |
| |
| // It is a function; cast it to a Function. |
| Handle<Function> fn_fun = Handle<Function>::Cast(fn_val); |
| |
| // Store the function in a Persistent handle, since we also want that to |
| // remain after this call returns. |
| fOnDraw.Reset(fIsolate, fn_fun); |
| |
| // Also make the context persistent. |
| fContext.Reset(fIsolate, context); |
| return true; |
| } |
| |
| SkOSWindow* create_sk_window(void* hwnd, int argc, char** argv) { |
| printf("Started\n"); |
| |
| // Get the default Isolate created at startup. |
| Isolate* isolate = Isolate::GetCurrent(); |
| |
| JsCanvas* jsCanvas = new JsCanvas(isolate); |
| const char* script = "function onDraw(canvas){" |
| "canvas.drawRect();" |
| "canvas.inval();" |
| "};"; |
| if (!jsCanvas->initialize(script)) { |
| printf("Failed to initialize.\n"); |
| exit(1); |
| } |
| |
| return new SkV8ExampleWindow(hwnd, jsCanvas); |
| } |