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 "V8CanvasRenderingContext2D.h"
36#include "V8Node.h"
37#include "V8WebGLRenderingContext.h"
38#include "bindings/v8/ExceptionState.h"
39#include "bindings/v8/ScriptState.h"
40#include "bindings/v8/V8Binding.h"
41#include "core/html/HTMLCanvasElement.h"
42#include "core/html/canvas/Canvas2DContextAttributes.h"
43#include "core/html/canvas/CanvasRenderingContext.h"
44#include "core/html/canvas/WebGLContextAttributes.h"
45#include "core/inspector/InspectorCanvasInstrumentation.h"
46#include "wtf/MathExtras.h"
47#include "wtf/text/WTFString.h"
48
49namespace WebCore {
50
51void V8HTMLCanvasElement::getContextMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
52{
53    v8::Handle<v8::Object> holder = info.Holder();
54    v8::Isolate* isolate = info.GetIsolate();
55    HTMLCanvasElement* imp = V8HTMLCanvasElement::toNative(holder);
56    V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, contextIdResource, info[0]);
57    String contextId = contextIdResource;
58    RefPtr<CanvasContextAttributes> attributes;
59    if (contextId == "webgl" || contextId == "experimental-webgl" || contextId == "webkit-3d") {
60        RefPtr<WebGLContextAttributes> webGLAttributes = WebGLContextAttributes::create();
61        if (info.Length() > 1 && info[1]->IsObject()) {
62            v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
63            v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
64            if (jsAttributes->Has(alpha))
65                webGLAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
66            v8::Handle<v8::String> depth = v8AtomicString(isolate, "depth");
67            if (jsAttributes->Has(depth))
68                webGLAttributes->setDepth(jsAttributes->Get(depth)->BooleanValue());
69            v8::Handle<v8::String> stencil = v8AtomicString(isolate, "stencil");
70            if (jsAttributes->Has(stencil))
71                webGLAttributes->setStencil(jsAttributes->Get(stencil)->BooleanValue());
72            v8::Handle<v8::String> antialias = v8AtomicString(isolate, "antialias");
73            if (jsAttributes->Has(antialias))
74                webGLAttributes->setAntialias(jsAttributes->Get(antialias)->BooleanValue());
75            v8::Handle<v8::String> premultipliedAlpha = v8AtomicString(isolate, "premultipliedAlpha");
76            if (jsAttributes->Has(premultipliedAlpha))
77                webGLAttributes->setPremultipliedAlpha(jsAttributes->Get(premultipliedAlpha)->BooleanValue());
78            v8::Handle<v8::String> preserveDrawingBuffer = v8AtomicString(isolate, "preserveDrawingBuffer");
79            if (jsAttributes->Has(preserveDrawingBuffer))
80                webGLAttributes->setPreserveDrawingBuffer(jsAttributes->Get(preserveDrawingBuffer)->BooleanValue());
81            v8::Handle<v8::String> failIfMajorPerformanceCaveat = v8AtomicString(isolate, "failIfMajorPerformanceCaveat");
82            if (jsAttributes->Has(failIfMajorPerformanceCaveat))
83                webGLAttributes->setFailIfMajorPerformanceCaveat(jsAttributes->Get(failIfMajorPerformanceCaveat)->BooleanValue());
84        }
85        attributes = webGLAttributes;
86    } else {
87        RefPtr<Canvas2DContextAttributes> canvas2DAttributes = Canvas2DContextAttributes::create();
88        if (info.Length() > 1 && info[1]->IsObject()) {
89            v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
90            v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
91            if (jsAttributes->Has(alpha))
92                canvas2DAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
93        }
94        attributes = canvas2DAttributes;
95    }
96    CanvasRenderingContext* result = imp->getContext(contextId, attributes.get());
97    if (!result) {
98        v8SetReturnValueNull(info);
99        return;
100    }
101    if (result->is2d()) {
102        v8::Handle<v8::Value> v8Result = toV8(toCanvasRenderingContext2D(result), info.Holder(), info.GetIsolate());
103        if (InspectorInstrumentation::canvasAgentEnabled(&imp->document())) {
104            ScriptState* scriptState = ScriptState::forContext(isolate->GetCurrentContext());
105            ScriptObject context(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
106            ScriptObject wrapped = InspectorInstrumentation::wrapCanvas2DRenderingContextForInstrumentation(&imp->document(), context);
107            if (!wrapped.hasNoValue()) {
108                v8SetReturnValue(info, wrapped.v8Value());
109                return;
110            }
111        }
112        v8SetReturnValue(info, v8Result);
113        return;
114    }
115    if (result->is3d()) {
116        v8::Handle<v8::Value> v8Result = toV8(toWebGLRenderingContext(result), info.Holder(), info.GetIsolate());
117        if (InspectorInstrumentation::canvasAgentEnabled(&imp->document())) {
118            ScriptState* scriptState = ScriptState::forContext(isolate->GetCurrentContext());
119            ScriptObject glContext(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
120            ScriptObject wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(&imp->document(), glContext);
121            if (!wrapped.hasNoValue()) {
122                v8SetReturnValue(info, wrapped.v8Value());
123                return;
124            }
125        }
126        v8SetReturnValue(info, v8Result);
127        return;
128    }
129    ASSERT_NOT_REACHED();
130    v8SetReturnValueNull(info);
131}
132
133void V8HTMLCanvasElement::toDataURLMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
134{
135    v8::Handle<v8::Object> holder = info.Holder();
136    HTMLCanvasElement* canvas = V8HTMLCanvasElement::toNative(holder);
137    ExceptionState exceptionState(ExceptionState::ExecutionContext, "toDataURL", "HTMLCanvasElement", info.Holder(), info.GetIsolate());
138
139    V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, type, info[0]);
140    double quality;
141    double* qualityPtr = 0;
142    if (info.Length() > 1 && info[1]->IsNumber()) {
143        quality = info[1]->NumberValue();
144        qualityPtr = &quality;
145    }
146
147    String result = canvas->toDataURL(type, qualityPtr, exceptionState);
148    exceptionState.throwIfNeeded();
149    v8SetReturnValueStringOrUndefined(info, result, info.GetIsolate());
150}
151
152} // namespace WebCore
153