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 "bindings/core/v8/V8HTMLCanvasElement.h"
34
35#include "bindings/core/v8/ExceptionState.h"
36#include "bindings/core/v8/V8Binding.h"
37#include "bindings/core/v8/V8CanvasRenderingContext2D.h"
38#include "bindings/core/v8/V8Node.h"
39#include "bindings/core/v8/V8WebGLRenderingContext.h"
40#include "core/html/HTMLCanvasElement.h"
41#include "core/html/canvas/Canvas2DContextAttributes.h"
42#include "core/html/canvas/CanvasRenderingContext.h"
43#include "core/html/canvas/WebGLContextAttributes.h"
44#include "core/inspector/InspectorCanvasInstrumentation.h"
45#include "wtf/MathExtras.h"
46#include "wtf/text/WTFString.h"
47
48namespace blink {
49
50void V8HTMLCanvasElement::getContextMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
51{
52    v8::Handle<v8::Object> holder = info.Holder();
53    v8::Isolate* isolate = info.GetIsolate();
54    HTMLCanvasElement* impl = V8HTMLCanvasElement::toImpl(holder);
55    TOSTRING_VOID(V8StringResource<>, contextIdResource, info[0]);
56    String contextId = contextIdResource;
57    RefPtrWillBeRawPtr<CanvasContextAttributes> attributes = nullptr;
58    if (contextId == "webgl" || contextId == "experimental-webgl") {
59        RefPtrWillBeRawPtr<WebGLContextAttributes> webGLAttributes = WebGLContextAttributes::create();
60        if (info.Length() > 1 && info[1]->IsObject()) {
61            v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
62            v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
63            if (jsAttributes->Has(alpha) && !isUndefinedOrNull(jsAttributes->Get(alpha)))
64                webGLAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
65            v8::Handle<v8::String> depth = v8AtomicString(isolate, "depth");
66            if (jsAttributes->Has(depth) && !isUndefinedOrNull(jsAttributes->Get(depth)))
67                webGLAttributes->setDepth(jsAttributes->Get(depth)->BooleanValue());
68            v8::Handle<v8::String> stencil = v8AtomicString(isolate, "stencil");
69            if (jsAttributes->Has(stencil) && !isUndefinedOrNull(jsAttributes->Get(stencil)))
70                webGLAttributes->setStencil(jsAttributes->Get(stencil)->BooleanValue());
71            v8::Handle<v8::String> antialias = v8AtomicString(isolate, "antialias");
72            if (jsAttributes->Has(antialias) && !isUndefinedOrNull(jsAttributes->Get(antialias)))
73                webGLAttributes->setAntialias(jsAttributes->Get(antialias)->BooleanValue());
74            v8::Handle<v8::String> premultipliedAlpha = v8AtomicString(isolate, "premultipliedAlpha");
75            if (jsAttributes->Has(premultipliedAlpha) && !isUndefinedOrNull(jsAttributes->Get(premultipliedAlpha)))
76                webGLAttributes->setPremultipliedAlpha(jsAttributes->Get(premultipliedAlpha)->BooleanValue());
77            v8::Handle<v8::String> preserveDrawingBuffer = v8AtomicString(isolate, "preserveDrawingBuffer");
78            if (jsAttributes->Has(preserveDrawingBuffer) && !isUndefinedOrNull(jsAttributes->Get(preserveDrawingBuffer)))
79                webGLAttributes->setPreserveDrawingBuffer(jsAttributes->Get(preserveDrawingBuffer)->BooleanValue());
80            v8::Handle<v8::String> failIfMajorPerformanceCaveat = v8AtomicString(isolate, "failIfMajorPerformanceCaveat");
81            if (jsAttributes->Has(failIfMajorPerformanceCaveat) && !isUndefinedOrNull(jsAttributes->Get(failIfMajorPerformanceCaveat)))
82                webGLAttributes->setFailIfMajorPerformanceCaveat(jsAttributes->Get(failIfMajorPerformanceCaveat)->BooleanValue());
83        }
84        attributes = webGLAttributes;
85    } else {
86        RefPtrWillBeRawPtr<Canvas2DContextAttributes> canvas2DAttributes = Canvas2DContextAttributes::create();
87        if (info.Length() > 1 && info[1]->IsObject()) {
88            v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
89            v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
90            if (jsAttributes->Has(alpha) && !isUndefinedOrNull(jsAttributes->Get(alpha)))
91                canvas2DAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
92        }
93        attributes = canvas2DAttributes;
94    }
95    CanvasRenderingContext* result = impl->getContext(contextId, attributes.get());
96    if (!result) {
97        v8SetReturnValueNull(info);
98        return;
99    }
100    if (result->is2d()) {
101        v8::Handle<v8::Value> v8Result = toV8(toCanvasRenderingContext2D(result), info.Holder(), info.GetIsolate());
102        if (InspectorInstrumentation::canvasAgentEnabled(&impl->document())) {
103            ScriptState* scriptState = ScriptState::current(isolate);
104            ScriptValue context(scriptState, v8Result);
105            ScriptValue wrapped = InspectorInstrumentation::wrapCanvas2DRenderingContextForInstrumentation(&impl->document(), context);
106            if (!wrapped.isEmpty()) {
107                v8SetReturnValue(info, wrapped.v8Value());
108                return;
109            }
110        }
111        v8SetReturnValue(info, v8Result);
112        return;
113    }
114    if (result->is3d()) {
115        v8::Handle<v8::Value> v8Result = toV8(toWebGLRenderingContext(result), info.Holder(), info.GetIsolate());
116        if (InspectorInstrumentation::canvasAgentEnabled(&impl->document())) {
117            ScriptState* scriptState = ScriptState::current(isolate);
118            ScriptValue glContext(scriptState, v8Result);
119            ScriptValue wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(&impl->document(), glContext);
120            if (!wrapped.isEmpty()) {
121                v8SetReturnValue(info, wrapped.v8Value());
122                return;
123            }
124        }
125        v8SetReturnValue(info, v8Result);
126        return;
127    }
128    ASSERT_NOT_REACHED();
129    v8SetReturnValueNull(info);
130}
131
132void V8HTMLCanvasElement::toDataURLMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
133{
134    v8::Handle<v8::Object> holder = info.Holder();
135    HTMLCanvasElement* canvas = V8HTMLCanvasElement::toImpl(holder);
136    ExceptionState exceptionState(ExceptionState::ExecutionContext, "toDataURL", "HTMLCanvasElement", info.Holder(), info.GetIsolate());
137
138    TOSTRING_VOID(V8StringResource<>, type, info[0]);
139    double quality;
140    double* qualityPtr = 0;
141    if (info.Length() > 1 && info[1]->IsNumber()) {
142        quality = info[1]->NumberValue();
143        qualityPtr = &quality;
144    }
145
146    String result = canvas->toDataURL(type, qualityPtr, exceptionState);
147    exceptionState.throwIfNeeded();
148    v8SetReturnValueStringOrUndefined(info, result, info.GetIsolate());
149}
150
151} // namespace blink
152