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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/CustomFilterProgramInfo.h"
     33 
     34 #include "wtf/HashFunctions.h"
     35 #include "wtf/text/StringHash.h"
     36 
     37 namespace WebCore {
     38 
     39 static unsigned hashPossiblyNullString(const String& string)
     40 {
     41     return string.isNull() ? 0 : DefaultHash<String>::Hash::hash(string);
     42 }
     43 
     44 CustomFilterProgramInfo::CustomFilterProgramInfo()
     45 {
     46 }
     47 
     48 bool CustomFilterProgramInfo::isEmptyValue() const
     49 {
     50     return m_vertexShaderString.isNull()
     51         && m_fragmentShaderString.isNull();
     52 }
     53 
     54 CustomFilterProgramInfo::CustomFilterProgramInfo(WTF::HashTableDeletedValueType)
     55     : m_vertexShaderString(WTF::HashTableDeletedValue)
     56     , m_fragmentShaderString(WTF::HashTableDeletedValue)
     57 {
     58 }
     59 
     60 bool CustomFilterProgramInfo::isHashTableDeletedValue() const
     61 {
     62     return m_vertexShaderString.isHashTableDeletedValue()
     63         && m_fragmentShaderString.isHashTableDeletedValue();
     64 }
     65 
     66 CustomFilterProgramInfo::CustomFilterProgramInfo(const String& vertexShader, const String& fragmentShader, CustomFilterProgramType programType, const CustomFilterProgramMixSettings& mixSettings, CustomFilterMeshType meshType)
     67     : m_vertexShaderString(vertexShader)
     68     , m_fragmentShaderString(fragmentShader)
     69     , m_programType(programType)
     70     , m_mixSettings(mixSettings)
     71     , m_meshType(meshType)
     72 {
     73     // At least one of the shaders needs to be non-null.
     74     ASSERT(!m_vertexShaderString.isNull() || !m_fragmentShaderString.isNull());
     75 }
     76 
     77 unsigned CustomFilterProgramInfo::hash() const
     78 {
     79     // At least one of the shaders needs to be non-null.
     80     ASSERT(!m_vertexShaderString.isNull() || !m_fragmentShaderString.isNull());
     81 
     82     bool blendsElementTexture = (m_programType == PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE);
     83     uintptr_t hashCodes[6] = {
     84         hashPossiblyNullString(m_vertexShaderString),
     85         hashPossiblyNullString(m_fragmentShaderString),
     86         blendsElementTexture,
     87         static_cast<uintptr_t>(blendsElementTexture ? m_mixSettings.blendMode : 0),
     88         static_cast<uintptr_t>(blendsElementTexture ? m_mixSettings.compositeOperator : 0),
     89         m_meshType
     90     };
     91     return StringHasher::hashMemory<sizeof(hashCodes)>(&hashCodes);
     92 }
     93 
     94 bool CustomFilterProgramInfo::operator==(const CustomFilterProgramInfo& o) const
     95 {
     96     ASSERT(!isHashTableDeletedValue());
     97     ASSERT(!o.isHashTableDeletedValue());
     98 
     99     return m_programType == o.m_programType
    100         && (m_programType != PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE || m_mixSettings == o.m_mixSettings)
    101         && m_meshType == o.m_meshType
    102         && m_vertexShaderString == o.m_vertexShaderString
    103         && m_fragmentShaderString == o.m_fragmentShaderString;
    104 }
    105 
    106 } // namespace WebCore
    107 
    108