jscanvasrenderingcontext2dcustom.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

                break;
            case 5:
                context->drawImage(imgElt, args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec),
                                   args.at(exec, 3).toFloat(exec), args.at(exec, 4).toFloat(exec), ec);
                setDOMException(exec, ec);
                break;
            case 9:
                context->drawImage(imgElt, FloatRect(args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec),
                                   args.at(exec, 3).toFloat(exec), args.at(exec, 4).toFloat(exec)),
                                   FloatRect(args.at(exec, 5).toFloat(exec), args.at(exec, 6).toFloat(exec),
                                   args.at(exec, 7).toFloat(exec), args.at(exec, 8).toFloat(exec)), ec);
                setDOMException(exec, ec);
                break;
            default:
                return throwError(exec, SyntaxError);
        }
    } else if (o->inherits(&JSHTMLCanvasElement::s_info)) {
        HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(static_cast<JSHTMLElement*>(o)->impl());
        switch (args.size()) {
            case 3:
                context->drawImage(canvas, args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec));
                break;
            case 5:
                context->drawImage(canvas, args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec),
                                   args.at(exec, 3).toFloat(exec), args.at(exec, 4).toFloat(exec), ec);
                setDOMException(exec, ec);
                break;
            case 9:
                context->drawImage(canvas, FloatRect(args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec),
                                   args.at(exec, 3).toFloat(exec), args.at(exec, 4).toFloat(exec)),
                                   FloatRect(args.at(exec, 5).toFloat(exec), args.at(exec, 6).toFloat(exec),
                                   args.at(exec, 7).toFloat(exec), args.at(exec, 8).toFloat(exec)), ec);
                setDOMException(exec, ec);
                break;
            default:
                return throwError(exec, SyntaxError);
        }
    } else {
        setDOMException(exec, TYPE_MISMATCH_ERR);
    }
    
    return jsUndefined();    
}

JSValuePtr JSCanvasRenderingContext2D::drawImageFromRect(ExecState* exec, const ArgList& args)
{ 
    CanvasRenderingContext2D* context = impl();
    
    JSValuePtr value = args.at(exec, 0);
    if (!value.isObject())
        return throwError(exec, TypeError);
    JSObject* o = asObject(value);
    
    if (!o->inherits(&JSHTMLImageElement::s_info))
        return throwError(exec, TypeError);
    context->drawImageFromRect(static_cast<HTMLImageElement*>(static_cast<JSHTMLElement*>(o)->impl()),
                               args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec),
                               args.at(exec, 3).toFloat(exec), args.at(exec, 4).toFloat(exec),
                               args.at(exec, 5).toFloat(exec), args.at(exec, 6).toFloat(exec),
                               args.at(exec, 7).toFloat(exec), args.at(exec, 8).toFloat(exec),
                               args.at(exec, 9).toString(exec));    
    return jsUndefined();    
}

JSValuePtr JSCanvasRenderingContext2D::setShadow(ExecState* exec, const ArgList& args)
{ 
    CanvasRenderingContext2D* context = impl();

    switch (args.size()) {
        case 3:
            context->setShadow(args.at(exec, 0).toFloat(exec), args.at(exec, 1).toFloat(exec),
                               args.at(exec, 2).toFloat(exec));
            break;
        case 4:
            if (args.at(exec, 3).isString())
                context->setShadow(args.at(exec, 0).toFloat(exec), args.at(exec, 1).toFloat(exec),
                                   args.at(exec, 2).toFloat(exec), asString(args.at(exec, 3))->value());
            else
                context->setShadow(args.at(exec, 0).toFloat(exec), args.at(exec, 1).toFloat(exec),
                                   args.at(exec, 2).toFloat(exec), args.at(exec, 3).toFloat(exec));
            break;
        case 5:
            if (args.at(exec, 3).isString())
                context->setShadow(args.at(exec, 0).toFloat(exec), args.at(exec, 1).toFloat(exec),
                                   args.at(exec, 2).toFloat(exec), asString(args.at(exec, 3))->value(),
                                   args.at(exec, 4).toFloat(exec));
            else
                context->setShadow(args.at(exec, 0).toFloat(exec), args.at(exec, 1).toFloat(exec),
                                   args.at(exec, 2).toFloat(exec), args.at(exec, 3).toFloat(exec),
                                   args.at(exec, 4).toFloat(exec));
            break;
        case 7:
            context->setShadow(args.at(exec, 0).toFloat(exec), args.at(exec, 1).toFloat(exec),
                               args.at(exec, 2).toFloat(exec), args.at(exec, 3).toFloat(exec),
                               args.at(exec, 4).toFloat(exec), args.at(exec, 5).toFloat(exec),
                               args.at(exec, 6).toFloat(exec));
            break;
        case 8:
            context->setShadow(args.at(exec, 0).toFloat(exec), args.at(exec, 1).toFloat(exec),
                               args.at(exec, 2).toFloat(exec), args.at(exec, 3).toFloat(exec),
                               args.at(exec, 4).toFloat(exec), args.at(exec, 5).toFloat(exec),
                               args.at(exec, 6).toFloat(exec), args.at(exec, 7).toFloat(exec));
            break;
        default:
            return throwError(exec, SyntaxError);
    }
    
    return jsUndefined();    
}

JSValuePtr JSCanvasRenderingContext2D::createPattern(ExecState* exec, const ArgList& args)
{ 
    CanvasRenderingContext2D* context = impl();

    JSValuePtr value = args.at(exec, 0);
    if (!value.isObject())
        return throwError(exec, TypeError);
    JSObject* o = asObject(value);

    if (o->inherits(&JSHTMLImageElement::s_info)) {
        ExceptionCode ec;
        JSValuePtr pattern = toJS(exec,
            context->createPattern(static_cast<HTMLImageElement*>(static_cast<JSHTMLElement*>(o)->impl()),
                                   valueToStringWithNullCheck(exec, args.at(exec, 1)), ec).get());
        setDOMException(exec, ec);
        return pattern;
    }
    if (o->inherits(&JSHTMLCanvasElement::s_info)) {
        ExceptionCode ec;
        JSValuePtr pattern = toJS(exec,
            context->createPattern(static_cast<HTMLCanvasElement*>(static_cast<JSHTMLElement*>(o)->impl()),
                valueToStringWithNullCheck(exec, args.at(exec, 1)), ec).get());
        setDOMException(exec, ec);
        return pattern;
    }
    setDOMException(exec, TYPE_MISMATCH_ERR);
    return jsUndefined();
}

JSValuePtr JSCanvasRenderingContext2D::putImageData(ExecState* exec, const ArgList& args)
{
    // putImageData has two variants
    // putImageData(ImageData, x, y)
    // putImageData(ImageData, x, y, dirtyX, dirtyY, dirtyWidth, dirtyHeight)
    CanvasRenderingContext2D* context = impl();

    ExceptionCode ec = 0;
    if (args.size() >= 7)
        context->putImageData(toImageData(args.at(exec, 0)), args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec), 
                              args.at(exec, 3).toFloat(exec), args.at(exec, 4).toFloat(exec), args.at(exec, 5).toFloat(exec), args.at(exec, 6).toFloat(exec), ec);
    else
        context->putImageData(toImageData(args.at(exec, 0)), args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec), ec);

    setDOMException(exec, ec);
    return jsUndefined();
}

JSValuePtr JSCanvasRenderingContext2D::fillText(ExecState* exec, const ArgList& args)
{ 
    CanvasRenderingContext2D* context = impl();

    // string arg = text to draw
    // number arg = x
    // number arg = y
    // optional number arg = maxWidth
    if (args.size() < 3 || args.size() > 4)
        return throwError(exec, SyntaxError);
    
    if (args.size() == 4)
        context->fillText(args.at(exec, 0).toString(exec), args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec), args.at(exec, 3).toFloat(exec));
    else
        context->fillText(args.at(exec, 0).toString(exec), args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec));
    return jsUndefined();
}

JSValuePtr JSCanvasRenderingContext2D::strokeText(ExecState* exec, const ArgList& args)
{ 
    CanvasRenderingContext2D* context = impl();

    // string arg = text to draw
    // number arg = x
    // number arg = y
    // optional number arg = maxWidth
    if (args.size() < 3 || args.size() > 4)
        return throwError(exec, SyntaxError);
    
    if (args.size() == 4)
        context->strokeText(args.at(exec, 0).toString(exec), args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec), args.at(exec, 3).toFloat(exec));
    else
        context->strokeText(args.at(exec, 0).toString(exec), args.at(exec, 1).toFloat(exec), args.at(exec, 2).toFloat(exec));
    return jsUndefined();
}

} // namespace WebCore