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      1 /*
      2  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1. Redistributions of source code must retain the above
      9  *    copyright notice, this list of conditions and the following
     10  *    disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above
     12  *    copyright notice, this list of conditions and the following
     13  *    disclaimer in the documentation and/or other materials
     14  *    provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AS IS AND ANY
     17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
     20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     21  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     25  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include "config.h"
     31 
     32 #include "core/platform/graphics/filters/custom/CustomFilterProgram.h"
     33 
     34 #include "core/platform/graphics/filters/custom/CustomFilterProgramClient.h"
     35 #include "core/platform/graphics/filters/custom/CustomFilterProgramInfo.h"
     36 
     37 namespace WebCore {
     38 
     39 CustomFilterProgram::CustomFilterProgram(CustomFilterProgramType programType, const CustomFilterProgramMixSettings& mixSettings, CustomFilterMeshType meshType)
     40     : m_programType(programType)
     41     , m_mixSettings(mixSettings)
     42     , m_meshType(meshType)
     43 {
     44     // Keep the constructor protected to prevent creating this object directly.
     45 }
     46 
     47 CustomFilterProgram::~CustomFilterProgram()
     48 {
     49     // All the clients should keep a reference to this object.
     50     ASSERT(m_clients.isEmpty());
     51 }
     52 
     53 void CustomFilterProgram::addClient(CustomFilterProgramClient* client)
     54 {
     55     if (m_clients.isEmpty()) {
     56         // Notify the StyleCustomFilterProgram that we now have at least a client
     57         // and the loading can begin.
     58         // Note: If the shader is already cached the first client will be notified,
     59         // even if the filter was already built. Add the client only after notifying
     60         // the cache about them, so that we avoid a useless recreation of the filters chain.
     61         willHaveClients();
     62     }
     63     m_clients.add(client);
     64 }
     65 
     66 void CustomFilterProgram::removeClient(CustomFilterProgramClient* client)
     67 {
     68     m_clients.remove(client);
     69     if (m_clients.isEmpty()) {
     70         // We have no clients anymore, the cached resources can be purged from memory.
     71         didRemoveLastClient();
     72     }
     73 }
     74 
     75 void CustomFilterProgram::notifyClients()
     76 {
     77     for (CustomFilterProgramClientList::iterator iter = m_clients.begin(), end = m_clients.end(); iter != end; ++iter)
     78         iter->key->notifyCustomFilterProgramLoaded(this);
     79 }
     80 
     81 CustomFilterProgramInfo CustomFilterProgram::programInfo() const
     82 {
     83     ASSERT(isLoaded());
     84     return CustomFilterProgramInfo(vertexShaderString(), fragmentShaderString(), m_programType, m_mixSettings, m_meshType);
     85 }
     86 
     87 } // namespace WebCore
     88