JSHTMLCanvasElementCustom.cpp   [plain text]

/*
 * Copyright (C) 2007, 2016, 2017 Apple Inc. All rights reserved.
 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "config.h"
#include "JSHTMLCanvasElement.h"

#include "HTMLCanvasElement.h"
#include "JSCanvasRenderingContext2D.h"
#include "JSDOMConvertDictionary.h"
#include "JSDOMConvertNullable.h"
#include "JSDOMConvertStrings.h"

#if ENABLE(WEBGL)
#include "JSWebGLContextAttributes.h"
#include "JSWebGLRenderingContext.h"
#if ENABLE(WEBGL2)
#include "JSWebGL2RenderingContext.h"
#endif
#endif

#if ENABLE(WEBGPU)
#include "JSWebGPURenderingContext.h"
#endif

using namespace JSC;

namespace WebCore {

JSValue JSHTMLCanvasElement::getContext(ExecState& state)
{
    auto& vm = state.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    if (UNLIKELY(state.argumentCount() < 1))
        return throwException(&state, scope, createNotEnoughArgumentsError(&state));

    auto contextId = convert<IDLDOMString>(state, state.uncheckedArgument(0));
    RETURN_IF_EXCEPTION(scope, JSValue());

    if (HTMLCanvasElement::is2dType(contextId))
        return toJS<IDLNullable<IDLInterface<CanvasRenderingContext2D>>>(state, *globalObject(), static_cast<CanvasRenderingContext2D*>(wrapped().getContext2d(contextId)));

#if ENABLE(WEBGL)
    if (HTMLCanvasElement::is3dType(contextId)) {
        auto attributes = convert<IDLDictionary<WebGLContextAttributes>>(state, state.argument(1));
        RETURN_IF_EXCEPTION(scope, JSValue());

        if (auto context = wrapped().getContextWebGL(contextId, WTFMove(attributes))) {
            if (is<WebGLRenderingContext>(*context))
                return toJS<IDLNullable<IDLInterface<WebGLRenderingContext>>>(state, *globalObject(), static_cast<WebGLRenderingContext*>(context));
#if ENABLE(WEBGL2)
            if (is<WebGL2RenderingContext>(*context))
                return toJS<IDLNullable<IDLInterface<WebGL2RenderingContext>>>(state, *globalObject(), static_cast<WebGL2RenderingContext*>(context));
#endif
        }
    }
#endif

#if ENABLE(WEBGPU)
    if (HTMLCanvasElement::isWebGPUType(contextId))
        return toJS<IDLNullable<IDLInterface<WebGPURenderingContext>>>(state, *globalObject(), static_cast<WebGPURenderingContext*>(wrapped().getContextWebGPU(contextId)));
#endif

    return jsNull();
}

JSValue JSHTMLCanvasElement::toDataURL(ExecState& state)
{
    VM& vm = state.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    auto type = convert<IDLNullable<IDLDOMString>>(state, state.argument(0));
    RETURN_IF_EXCEPTION(scope, JSC::JSValue());

    std::optional<double> quality;
    auto qualityValue = state.argument(1);
    if (qualityValue.isNumber())
        quality = qualityValue.toNumber(&state);

    // We would use toJS<IDLString> here, but it uses jsStringWithCache and we historically
    // did not cache here, presumably because results are likely to be differing long strings.
    auto result = wrapped().toDataURL(type, quality);
    if (result.hasException()) {
        propagateException(state, scope, result.releaseException());
        return { };
    }
    return jsString(&state, result.releaseReturnValue());
}

} // namespace WebCore