1/*
2** Copyright 2007, The Android Open Source Project
3**
4** Licensed under the Apache License, Version 2.0 (the "License");
5** you may not use this file except in compliance with the License.
6** You may obtain a copy of the License at
7**
8**     http://www.apache.org/licenses/LICENSE-2.0
9**
10** Unless required by applicable law or agreed to in writing, software
11** distributed under the License is distributed on an "AS IS" BASIS,
12** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13** See the License for the specific language governing permissions and
14** limitations under the License.
15*/
16
17#ifndef SkBitmapProcState_DEFINED
18#define SkBitmapProcState_DEFINED
19
20#include "SkBitmap.h"
21#include "SkMatrix.h"
22
23class SkPaint;
24
25struct SkBitmapProcState {
26
27    typedef void (*ShaderProc32)(const SkBitmapProcState&, int x, int y,
28                                 SkPMColor[], int count);
29
30    typedef void (*ShaderProc16)(const SkBitmapProcState&, int x, int y,
31                                 uint16_t[], int count);
32
33    typedef void (*MatrixProc)(const SkBitmapProcState&,
34                               uint32_t bitmapXY[],
35                               int count,
36                               int x, int y);
37
38    typedef void (*SampleProc32)(const SkBitmapProcState&,
39                                 const uint32_t[],
40                                 int count,
41                                 SkPMColor colors[]);
42
43    typedef void (*SampleProc16)(const SkBitmapProcState&,
44                                 const uint32_t[],
45                                 int count,
46                                 uint16_t colors[]);
47
48    typedef U16CPU (*FixedTileProc)(SkFixed);   // returns 0..0xFFFF
49    typedef U16CPU (*IntTileProc)(int value, int count);   // returns 0..count-1
50
51    // If a shader proc is present, then the corresponding matrix/sample procs
52    // are ignored
53    ShaderProc32        fShaderProc32;      // chooseProcs
54    ShaderProc16        fShaderProc16;      // chooseProcs
55    // These are used if the shaderproc is NULL
56    MatrixProc          fMatrixProc;        // chooseProcs
57    SampleProc32        fSampleProc32;      // chooseProcs
58    SampleProc16        fSampleProc16;      // chooseProcs
59
60    const SkBitmap*     fBitmap;            // chooseProcs - orig or mip
61    const SkMatrix*     fInvMatrix;         // chooseProcs
62    SkMatrix::MapXYProc fInvProc;           // chooseProcs
63
64    FixedTileProc       fTileProcX;         // chooseProcs
65    FixedTileProc       fTileProcY;         // chooseProcs
66    IntTileProc         fIntTileProcY;      // chooseProcs
67    SkFixed             fFilterOneX;
68    SkFixed             fFilterOneY;
69
70    SkPMColor           fPaintPMColor;      // chooseProcs - A8 config
71    SkFixed             fInvSx;             // chooseProcs
72    SkFixed             fInvKy;             // chooseProcs
73    uint16_t            fAlphaScale;        // chooseProcs
74    uint8_t             fInvType;           // chooseProcs
75    uint8_t             fTileModeX;         // CONSTRUCTOR
76    uint8_t             fTileModeY;         // CONSTRUCTOR
77    SkBool8             fDoFilter;          // chooseProcs
78
79    /** Platforms implement this, and can optionally overwrite only the
80        following fields:
81
82        fShaderProc32
83        fShaderProc16
84        fMatrixProc
85        fSampleProc32
86        fSampleProc32
87
88        They will already have valid function pointers, so a platform that does
89        not have an accelerated version can just leave that field as is. A valid
90        implementation can do nothing (see SkBitmapProcState_opts_none.cpp)
91     */
92    void platformProcs();
93
94    /** Given the size of a buffer, to be used for calling the matrix and
95        sample procs, this return the maximum count that can be stored in the
96        buffer, taking into account that filtering and scale-vs-affine affect
97        this value.
98
99        Only valid to call after chooseProcs (setContext) has been called. It is
100        safe to call this inside the shader's shadeSpan() method.
101     */
102    int maxCountForBufferSize(size_t bufferSize) const;
103
104private:
105    friend class SkBitmapProcShader;
106
107    SkMatrix            fUnitInvMatrix;     // chooseProcs
108    SkBitmap            fOrigBitmap;        // CONSTRUCTOR
109    SkBitmap            fMipBitmap;
110
111    MatrixProc chooseMatrixProc(bool trivial_matrix);
112    bool chooseProcs(const SkMatrix& inv, const SkPaint&);
113};
114
115/*  Macros for packing and unpacking pairs of 16bit values in a 32bit uint.
116    Used to allow access to a stream of uint16_t either one at a time, or
117    2 at a time by unpacking a uint32_t
118 */
119#ifdef SK_CPU_BENDIAN
120    #define PACK_TWO_SHORTS(pri, sec) ((pri) << 16 | (sec))
121    #define UNPACK_PRIMARY_SHORT(packed)    ((uint32_t)(packed) >> 16)
122    #define UNPACK_SECONDARY_SHORT(packed)  ((packed) & 0xFFFF)
123#else
124    #define PACK_TWO_SHORTS(pri, sec) ((pri) | ((sec) << 16))
125    #define UNPACK_PRIMARY_SHORT(packed)    ((packed) & 0xFFFF)
126    #define UNPACK_SECONDARY_SHORT(packed)  ((uint32_t)(packed) >> 16)
127#endif
128
129#ifdef SK_DEBUG
130    static inline uint32_t pack_two_shorts(U16CPU pri, U16CPU sec) {
131        SkASSERT((uint16_t)pri == pri);
132        SkASSERT((uint16_t)sec == sec);
133        return PACK_TWO_SHORTS(pri, sec);
134    }
135#else
136    #define pack_two_shorts(pri, sec)   PACK_TWO_SHORTS(pri, sec)
137#endif
138
139// These functions are generated via macros, but are exposed here so that
140// platformProcs may test for them by name.
141void S32_opaque_D32_filter_DX(const SkBitmapProcState& s, const uint32_t xy[],
142                              int count, SkPMColor colors[]);
143void S32_alpha_D32_filter_DX(const SkBitmapProcState& s, const uint32_t xy[],
144                             int count, SkPMColor colors[]);
145
146#endif
147