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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/CustomFilterOperation.h"
     33 
     34 #include "core/platform/graphics/filters/FilterOperation.h"
     35 #include "core/platform/graphics/filters/custom/CustomFilterParameter.h"
     36 #include "core/platform/graphics/filters/custom/CustomFilterProgram.h"
     37 
     38 namespace WebCore {
     39 
     40 CustomFilterOperation::CustomFilterOperation(PassRefPtr<CustomFilterProgram> program, const CustomFilterParameterList& sortedParameters, unsigned meshRows, unsigned meshColumns, CustomFilterMeshType meshType)
     41     : FilterOperation(CUSTOM)
     42     , m_program(program)
     43     , m_parameters(sortedParameters)
     44     , m_meshRows(meshRows)
     45     , m_meshColumns(meshColumns)
     46     , m_meshType(meshType)
     47 {
     48     // Make sure that the parameters are alwyas sorted by name. We use that to merge two CustomFilterOperations in animations.
     49     ASSERT(m_parameters.checkAlphabeticalOrder());
     50 }
     51 
     52 CustomFilterOperation::~CustomFilterOperation()
     53 {
     54 }
     55 
     56 PassRefPtr<FilterOperation> CustomFilterOperation::blend(const FilterOperation* from, double progress, bool blendToPassthrough)
     57 {
     58     // FIXME: There's no way to decide what is the "passthrough filter" for shaders using the current CSS Syntax.
     59     // https://bugs.webkit.org/show_bug.cgi?id=84903
     60     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=16861
     61     if (blendToPassthrough || !from || !from->isSameType(*this))
     62         return this;
     63 
     64     const CustomFilterOperation* fromOp = static_cast<const CustomFilterOperation*>(from);
     65     if (m_program.get() != fromOp->m_program.get()
     66         || m_meshRows != fromOp->m_meshRows
     67         || m_meshColumns != fromOp->m_meshColumns
     68         || m_meshType != fromOp->m_meshType)
     69         return this;
     70 
     71     CustomFilterParameterList animatedParameters;
     72     m_parameters.blend(fromOp->m_parameters, progress, animatedParameters);
     73     return CustomFilterOperation::create(m_program, animatedParameters, m_meshRows, m_meshColumns, m_meshType);
     74 }
     75 
     76 } // namespace WebCore
     77 
     78