1/*
2 * Copyright (C) 2007-2009 Google Inc. All rights reserved.
3 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33#include "V8HTMLCanvasElement.h"
34
35#include "CanvasContextAttributes.h"
36#include "CanvasRenderingContext.h"
37#include "HTMLCanvasElement.h"
38#include "PlatformString.h"
39#include "WebGLContextAttributes.h"
40#include "V8Binding.h"
41#include "V8CanvasRenderingContext2D.h"
42#include "V8Node.h"
43#include "V8Proxy.h"
44#if ENABLE(WEBGL)
45#include "V8WebGLRenderingContext.h"
46#endif
47#include <wtf/MathExtras.h>
48
49namespace WebCore {
50
51v8::Handle<v8::Value> V8HTMLCanvasElement::getContextCallback(const v8::Arguments& args)
52{
53    INC_STATS("DOM.HTMLCanvasElement.context");
54    v8::Handle<v8::Object> holder = args.Holder();
55    HTMLCanvasElement* imp = V8HTMLCanvasElement::toNative(holder);
56    String contextId = toWebCoreString(args[0]);
57    RefPtr<CanvasContextAttributes> attrs;
58#if ENABLE(WEBGL)
59    if (contextId == "experimental-webgl" || contextId == "webkit-3d") {
60        attrs = WebGLContextAttributes::create();
61        WebGLContextAttributes* webGLAttrs = static_cast<WebGLContextAttributes*>(attrs.get());
62        if (args.Length() > 1 && args[1]->IsObject()) {
63            v8::Handle<v8::Object> jsAttrs = args[1]->ToObject();
64            v8::Handle<v8::String> alpha = v8::String::New("alpha");
65            if (jsAttrs->Has(alpha))
66                webGLAttrs->setAlpha(jsAttrs->Get(alpha)->BooleanValue());
67            v8::Handle<v8::String> depth = v8::String::New("depth");
68            if (jsAttrs->Has(depth))
69                webGLAttrs->setDepth(jsAttrs->Get(depth)->BooleanValue());
70            v8::Handle<v8::String> stencil = v8::String::New("stencil");
71            if (jsAttrs->Has(stencil))
72                webGLAttrs->setStencil(jsAttrs->Get(stencil)->BooleanValue());
73            v8::Handle<v8::String> antialias = v8::String::New("antialias");
74            if (jsAttrs->Has(antialias))
75                webGLAttrs->setAntialias(jsAttrs->Get(antialias)->BooleanValue());
76            v8::Handle<v8::String> premultipliedAlpha = v8::String::New("premultipliedAlpha");
77            if (jsAttrs->Has(premultipliedAlpha))
78                webGLAttrs->setPremultipliedAlpha(jsAttrs->Get(premultipliedAlpha)->BooleanValue());
79            v8::Handle<v8::String> preserveDrawingBuffer = v8::String::New("preserveDrawingBuffer");
80            if (jsAttrs->Has(preserveDrawingBuffer))
81                webGLAttrs->setPreserveDrawingBuffer(jsAttrs->Get(preserveDrawingBuffer)->BooleanValue());
82        }
83    }
84#endif
85    CanvasRenderingContext* result = imp->getContext(contextId, attrs.get());
86    if (!result)
87        return v8::Null();
88    if (result->is2d())
89        return toV8(static_cast<CanvasRenderingContext2D*>(result));
90#if ENABLE(WEBGL)
91    else if (result->is3d())
92        return toV8(static_cast<WebGLRenderingContext*>(result));
93#endif
94    ASSERT_NOT_REACHED();
95    return v8::Null();
96}
97
98v8::Handle<v8::Value> V8HTMLCanvasElement::toDataURLCallback(const v8::Arguments& args)
99{
100    v8::Handle<v8::Object> holder = args.Holder();
101    HTMLCanvasElement* canvas = V8HTMLCanvasElement::toNative(holder);
102    ExceptionCode ec = 0;
103
104    String type = toWebCoreString(args[0]);
105    double quality;
106    double* qualityPtr = 0;
107    if (args.Length() > 1 && args[1]->IsNumber()) {
108        quality = args[1]->NumberValue();
109        qualityPtr = &quality;
110    }
111
112    String result = canvas->toDataURL(type, qualityPtr, ec);
113    V8Proxy::setDOMException(ec);
114    return v8StringOrUndefined(result);
115}
116
117} // namespace WebCore
118