src/pipe/SkGPipePriv.h

/*
    Copyright 2011 Google Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
 */


#ifndef SkGPipePriv_DEFINED
#define SkGPipePriv_DEFINED

#include "SkTypes.h"

#define UNIMPLEMENTED

// these must be contiguous, 0...N-1
enum PaintFlats {
    kColorFilter_PaintFlat,
    kDrawLooper_PaintFlat,
    kMaskFilter_PaintFlat,
    kPathEffect_PaintFlat,
    kRasterizer_PaintFlat,
    kShader_PaintFlat,
    kXfermode_PaintFlat,

    kLast_PaintFlat = kXfermode_PaintFlat
};
#define kCount_PaintFlats   (kLast_PaintFlat + 1)

enum DrawOps {
    kSkip_DrawOp,   // skip an addition N bytes (N == data)

    // these match Canvas apis
    kClipPath_DrawOp,
    kClipRegion_DrawOp,
    kClipRect_DrawOp,
    kConcat_DrawOp,
    kDrawBitmap_DrawOp,
    kDrawBitmapMatrix_DrawOp,
    kDrawBitmapRect_DrawOp,
    kDrawClear_DrawOp,
    kDrawData_DrawOp,
    kDrawPaint_DrawOp,
    kDrawPath_DrawOp,
    kDrawPicture_DrawOp,
    kDrawPoints_DrawOp,
    kDrawPosText_DrawOp,
    kDrawPosTextH_DrawOp,
    kDrawRect_DrawOp,
    kDrawShape_DrawOp,
    kDrawSprite_DrawOp,
    kDrawText_DrawOp,
    kDrawTextOnPath_DrawOp,
    kDrawVertices_DrawOp,
    kRestore_DrawOp,
    kRotate_DrawOp,
    kSave_DrawOp,
    kSaveLayer_DrawOp,
    kScale_DrawOp,
    kSetMatrix_DrawOp,
    kSkew_DrawOp,
    kTranslate_DrawOp,

    kPaintOp_DrawOp,

    kDef_Typeface_DrawOp,
    kDef_Flattenable_DrawOp,

    kName_Flattenable_DrawOp,   // index <--> name

    // these are signals to playback, not drawing verbs
    kDone_DrawOp,
};

/**
 *  DrawOp packs into a 32bit int as follows
 *
 *  DrawOp:8 - Flags:4 - Data:20
 *
 *  Flags and Data are called out separately, so we can reuse Data between
 *  different Ops that might have different Flags. e.g. Data might be a Paint
 *  index for both drawRect (no flags) and saveLayer (does have flags).
 *
 *  All Ops that take a SkPaint use their Data field to store the index to
 *  the paint (previously defined with kPaintOp_DrawOp).
 */

#define DRAWOPS_OP_BITS     8
#define DRAWOPS_FLAG_BITS   4
#define DRAWOPS_DATA_BITS   20

#define DRAWOPS_OP_MASK     ((1 << DRAWOPS_OP_BITS) - 1)
#define DRAWOPS_FLAG_MASK   ((1 << DRAWOPS_FLAG_BITS) - 1)
#define DRAWOPS_DATA_MASK   ((1 << DRAWOPS_DATA_BITS) - 1)

static unsigned DrawOp_unpackOp(uint32_t op32) {
    return (op32 >> (DRAWOPS_FLAG_BITS + DRAWOPS_DATA_BITS));
}

static unsigned DrawOp_unpackFlags(uint32_t op32) {
    return (op32 >> DRAWOPS_DATA_BITS) & DRAWOPS_FLAG_MASK;
}

static unsigned DrawOp_unpackData(uint32_t op32) {
    return op32 & DRAWOPS_DATA_MASK;
}

static uint32_t DrawOp_packOpFlagData(DrawOps op, unsigned flags, unsigned data) {
    SkASSERT(0 == (op & ~DRAWOPS_OP_MASK));
    SkASSERT(0 == (flags & ~DRAWOPS_FLAG_MASK));
    SkASSERT(0 == (data & ~DRAWOPS_DATA_MASK));

    return (op << DRAWOPS_FLAG_BITS + DRAWOPS_DATA_BITS) |
           (flags << DRAWOPS_DATA_BITS) |
            data;
}

/** DrawOp specific flag bits
 */

enum {
    kSaveLayer_HasBounds_DrawOpFlag = 1 << 0,
    kSaveLayer_HasPaint_DrawOpFlag = 1 << 1,
};
enum {
    kClear_HasColor_DrawOpFlag  = 1 << 0
};
enum {
    kDrawTextOnPath_HasMatrix_DrawOpFlag = 1 << 0
};
enum {
    kDrawVertices_HasTexs_DrawOpFlag     = 1 << 0,
    kDrawVertices_HasColors_DrawOpFlag   = 1 << 1,
    kDrawVertices_HasIndices_DrawOpFlag  = 1 << 2,
};

///////////////////////////////////////////////////////////////////////////////

enum PaintOps {
    kReset_PaintOp,     // no arg
    
    kFlags_PaintOp,     // arg inline
    kColor_PaintOp,     // arg 32
    kStyle_PaintOp,     // arg inline
    kJoin_PaintOp,      // arg inline
    kCap_PaintOp,       // arg inline
    kWidth_PaintOp,     // arg scalar
    kMiter_PaintOp,// arg scalar
    
    kEncoding_PaintOp,  // arg inline - text
    kHinting_PaintOp,   // arg inline - text
    kAlign_PaintOp,     // arg inline - text
    kTextSize_PaintOp,  // arg scalar - text
    kTextScaleX_PaintOp,// arg scalar - text
    kTextSkewX_PaintOp, // arg scalar - text
    kTypeface_PaintOp,  // arg inline (index) - text

    kFlatIndex_PaintOp, // flags=paintflat, data=index
};

#define PAINTOPS_OP_BITS     8
#define PAINTOPS_FLAG_BITS   4
#define PAINTOPS_DATA_BITS   20

#define PAINTOPS_OP_MASK     ((1 << PAINTOPS_OP_BITS) - 1)
#define PAINTOPS_FLAG_MASK   ((1 << PAINTOPS_FLAG_BITS) - 1)
#define PAINTOPS_DATA_MASK   ((1 << PAINTOPS_DATA_BITS) - 1)

static unsigned PaintOp_unpackOp(uint32_t op32) {
    return (op32 >> (PAINTOPS_FLAG_BITS + PAINTOPS_DATA_BITS));
}

static unsigned PaintOp_unpackFlags(uint32_t op32) {
    return (op32 >> PAINTOPS_DATA_BITS) & PAINTOPS_FLAG_MASK;
}

static unsigned PaintOp_unpackData(uint32_t op32) {
    return op32 & PAINTOPS_DATA_MASK;
}

static uint32_t PaintOp_packOp(PaintOps op) {
    SkASSERT(0 == (op & ~PAINTOPS_OP_MASK));
    
    return (op << PAINTOPS_FLAG_BITS + PAINTOPS_DATA_BITS);
}

static uint32_t PaintOp_packOpData(PaintOps op, unsigned data) {
    SkASSERT(0 == (op & ~PAINTOPS_OP_MASK));
    SkASSERT(0 == (data & ~PAINTOPS_DATA_MASK));
    
    return (op << PAINTOPS_FLAG_BITS + PAINTOPS_DATA_BITS) | data;
}

static uint32_t PaintOp_packOpFlagData(PaintOps op, unsigned flags, unsigned data) {
    SkASSERT(0 == (op & ~PAINTOPS_OP_MASK));
    SkASSERT(0 == (flags & ~PAINTOPS_FLAG_MASK));
    SkASSERT(0 == (data & ~PAINTOPS_DATA_MASK));
    
    return (op << PAINTOPS_FLAG_BITS + PAINTOPS_DATA_BITS) |
    (flags << PAINTOPS_DATA_BITS) |
    data;
}

#endif