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      1 /*
      2  * Copyright (C) 2011 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 #ifndef CustomFilterMeshGenerator_h
     31 #define CustomFilterMeshGenerator_h
     32 
     33 #include "core/platform/graphics/FloatRect.h"
     34 #include "core/platform/graphics/filters/custom/CustomFilterConstants.h"
     35 #include "core/platform/graphics/filters/custom/CustomFilterOperation.h"
     36 
     37 namespace WebCore {
     38 
     39 class CustomFilterMeshGenerator {
     40 public:
     41     // Lines and columns are the values passed in CSS. The result is vertex mesh that has 'rows' numbers of rows
     42     // and 'columns' number of columns with a total of 'rows + 1' * 'columns + 1' vertices.
     43     // MeshBox is the filtered area calculated defined using the border-box, padding-box, content-box or filter-box
     44     // attributes. A value of (0, 0, 1, 1) will cover the entire output surface.
     45     CustomFilterMeshGenerator(unsigned columns, unsigned rows, const FloatRect& meshBox, CustomFilterMeshType);
     46 
     47     const Vector<float>& vertices() const { return m_vertices; }
     48     const Vector<uint16_t>& indices() const { return m_indices; }
     49 
     50     const IntSize& points() const { return m_points; }
     51     unsigned pointsCount() const { return m_points.width() * m_points.height(); }
     52 
     53     const IntSize& tiles() const { return m_tiles; }
     54     unsigned tilesCount() const { return m_tiles.width() * m_tiles.height(); }
     55 
     56     unsigned indicesCount() const
     57     {
     58         const unsigned trianglesPerTile = 2;
     59         const unsigned indicesPerTriangle = 3;
     60         return tilesCount() * trianglesPerTile * indicesPerTriangle;
     61     }
     62 
     63     unsigned floatsPerVertex() const
     64     {
     65         static const unsigned AttachedMeshVertexSize = PositionAttribSize + TexAttribSize + MeshAttribSize;
     66         static const unsigned DetachedMeshVertexSize = AttachedMeshVertexSize + TriangleAttribSize;
     67         return m_meshType == MeshTypeAttached ? AttachedMeshVertexSize : DetachedMeshVertexSize;
     68     }
     69 
     70     unsigned verticesCount() const
     71     {
     72         return m_meshType == MeshTypeAttached ? pointsCount() : indicesCount();
     73     }
     74 
     75 private:
     76     typedef void (CustomFilterMeshGenerator::*AddTriangleVertexFunction)(int quadX, int quadY, int triangleX, int triangleY, int triangle);
     77 
     78     template <AddTriangleVertexFunction addTriangleVertex>
     79     void addTile(int quadX, int quadY)
     80     {
     81         ((*this).*(addTriangleVertex))(quadX, quadY, 0, 0, 1);
     82         ((*this).*(addTriangleVertex))(quadX, quadY, 1, 0, 2);
     83         ((*this).*(addTriangleVertex))(quadX, quadY, 1, 1, 3);
     84         ((*this).*(addTriangleVertex))(quadX, quadY, 0, 0, 4);
     85         ((*this).*(addTriangleVertex))(quadX, quadY, 1, 1, 5);
     86         ((*this).*(addTriangleVertex))(quadX, quadY, 0, 1, 6);
     87     }
     88 
     89     void addAttachedMeshIndex(int quadX, int quadY, int triangleX, int triangleY, int triangle);
     90 
     91     void generateAttachedMesh();
     92 
     93     void addDetachedMeshVertexAndIndex(int quadX, int quadY, int triangleX, int triangleY, int triangle);
     94 
     95     void generateDetachedMesh();
     96     void addPositionAttribute(int quadX, int quadY);
     97     void addTexCoordAttribute(int quadX, int quadY);
     98     void addMeshCoordAttribute(int quadX, int quadY);
     99     void addTriangleCoordAttribute(int quadX, int quadY, int triangle);
    100     void addAttachedMeshVertexAttributes(int quadX, int quadY);
    101     void addDetachedMeshVertexAttributes(int quadX, int quadY, int triangleX, int triangleY, int triangle);
    102 
    103 #ifndef NDEBUG
    104     void dumpBuffers() const;
    105 #endif
    106 
    107 private:
    108     Vector<float> m_vertices;
    109     Vector<uint16_t> m_indices;
    110 
    111     CustomFilterMeshType m_meshType;
    112     IntSize m_points;
    113     IntSize m_tiles;
    114     FloatSize m_tileSizeInPixels;
    115     FloatSize m_tileSizeInDeviceSpace;
    116     FloatRect m_meshBox;
    117 };
    118 
    119 } // namespace WebCore
    120 
    121 #endif // CustomFilterMeshGenerator_h
    122