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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/mediacapturefromelement/html_canvas_element_capture.h"
#include <memory>
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_media_stream.h"
#include "third_party/blink/public/platform/web_media_stream_track.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/html/canvas/html_canvas_element.h"
#include "third_party/blink/renderer/modules/mediacapturefromelement/canvas_capture_handler.h"
#include "third_party/blink/renderer/modules/mediacapturefromelement/canvas_capture_media_stream_track.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream.h"
namespace {
const double kDefaultFrameRate = 60.0;
} // anonymous namespace
namespace blink {
MediaStream* HTMLCanvasElementCapture::captureStream(
ScriptState* script_state,
HTMLCanvasElement& element,
ExceptionState& exception_state) {
return HTMLCanvasElementCapture::captureStream(script_state, element, false,
0, exception_state);
}
MediaStream* HTMLCanvasElementCapture::captureStream(
ScriptState* script_state,
HTMLCanvasElement& element,
double frame_rate,
ExceptionState& exception_state) {
if (frame_rate < 0.0) {
exception_state.ThrowDOMException(DOMExceptionCode::kNotSupportedError,
"Given frame rate is not supported.");
return nullptr;
}
return HTMLCanvasElementCapture::captureStream(script_state, element, true,
frame_rate, exception_state);
}
MediaStream* HTMLCanvasElementCapture::captureStream(
ScriptState* script_state,
HTMLCanvasElement& element,
bool given_frame_rate,
double frame_rate,
ExceptionState& exception_state) {
if (!element.OriginClean()) {
exception_state.ThrowSecurityError("Canvas is not origin-clean.");
return nullptr;
}
LocalFrame* frame = ToLocalFrameIfNotDetached(script_state->GetContext());
WebMediaStreamTrack track;
const WebSize size(element.width(), element.height());
std::unique_ptr<CanvasCaptureHandler> handler;
if (given_frame_rate) {
handler = CanvasCaptureHandler::CreateCanvasCaptureHandler(
frame, size, frame_rate, Platform::Current()->GetIOTaskRunner(),
&track);
} else {
handler = CanvasCaptureHandler::CreateCanvasCaptureHandler(
frame, size, kDefaultFrameRate, Platform::Current()->GetIOTaskRunner(),
&track);
}
if (!handler) {
exception_state.ThrowDOMException(
DOMExceptionCode::kNotSupportedError,
"No CanvasCapture handler can be created.");
return nullptr;
}
ExecutionContext* context = ExecutionContext::From(script_state);
DCHECK(context);
CanvasCaptureMediaStreamTrack* canvas_track;
if (given_frame_rate) {
canvas_track = MakeGarbageCollected<CanvasCaptureMediaStreamTrack>(
track, &element, context, std::move(handler), frame_rate);
} else {
canvas_track = MakeGarbageCollected<CanvasCaptureMediaStreamTrack>(
track, &element, context, std::move(handler));
}
// We want to capture a frame in the beginning.
canvas_track->requestFrame();
MediaStreamTrackVector tracks;
tracks.push_back(canvas_track);
return MediaStream::Create(context, tracks);
}
} // namespace blink
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