Source/WebCore/css/WebKitCSSShaderValue.cpp

/*
 * Copyright (C) 2011 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDER “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 THE COPYRIGHT HOLDER 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
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 */

#include "config.h"

#if ENABLE(CSS_SHADERS)
#include "WebKitCSSShaderValue.h"

#include "CSSParser.h"
#include "CachedResourceLoader.h"
#include "CachedResourceRequest.h"
#include "CachedResourceRequestInitiators.h"
#include "Document.h"
#include "URL.h"
#include "StyleCachedShader.h"
#include "StylePendingShader.h"
#include <wtf/text/StringBuilder.h>

namespace WebCore {

WebKitCSSShaderValue::WebKitCSSShaderValue(const String& url)
    : CSSValue(WebKitCSSShaderClass)
    , m_url(url)
    , m_accessedShader(false)
{
}

WebKitCSSShaderValue::~WebKitCSSShaderValue()
{
}

URL WebKitCSSShaderValue::completeURL(CachedResourceLoader* loader) const
{
    return loader->document()->completeURL(m_url);
}

StyleCachedShader* WebKitCSSShaderValue::cachedShader(CachedResourceLoader* loader)
{
    ASSERT(loader);

    if (!m_accessedShader) {
        m_accessedShader = true;

        CachedResourceRequest request(ResourceRequest(completeURL(loader)));
        request.setInitiator(cachedResourceRequestInitiators().css);
        if (CachedResourceHandle<CachedShader> cachedShader = loader->requestShader(request))
            m_shader = StyleCachedShader::create(cachedShader.get());
    }

    return (m_shader && m_shader->isCachedShader()) ? static_cast<StyleCachedShader*>(m_shader.get()) : 0;
}

StyleShader* WebKitCSSShaderValue::cachedOrPendingShader()
{
    if (!m_shader)
        m_shader = StylePendingShader::create(this);

    return m_shader.get();
}

String WebKitCSSShaderValue::customCSSText() const
{
    StringBuilder result;
    result.appendLiteral("url(");
    result.append(quoteCSSURLIfNeeded(m_url));
    result.append(')');
    if (!m_format.isEmpty()) {
        result.appendLiteral(" format('");
        result.append(m_format);
        result.appendLiteral("')");
    }
    return result.toString();
}

bool WebKitCSSShaderValue::equals(const WebKitCSSShaderValue& other) const
{
    return m_url == other.m_url;
}
    
} // namespace WebCore

#endif // ENABLE(CSS_SHADERS)