Quelle  SkPDFGraphicState.h   Sprache: C

/*
 * Copyright 2010 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#ifndef SkPDFGraphicState_DEFINED
#define SkPDFGraphicState_DEFINED

#include "include/core/SkScalar.h"
#include "include/private/base/SkMacros.h"
#include "src/core/SkChecksum.h"
#include "src/pdf/SkPDFTypes.h"

#include <cstdint>
#include <cstring>

class SkPDFDocument;
class SkPaint;

/** \class SkPDFGraphicState
    SkPaint objects roughly correspond to graphic state dictionaries that can
    be installed. So that a given dictionary is only output to the pdf file
    once, we want to canonicalize them.
*/
namespace SkPDFGraphicState {
    enum SkPDFSMaskMode {
        kAlpha_SMaskMode,
        kLuminosity_SMaskMode
    };

    /** Get the graphic state for the passed SkPaint.
     */
    SkPDFIndirectReference GetGraphicStateForPaint(SkPDFDocument*, const SkPaint&);

    /** Make a graphic state that only sets the passed soft mask.
     *  @param sMask     The form xobject to use as a soft mask.
     *  @param invert    Indicates if the alpha of the sMask should be inverted.
     *  @param sMaskMode Whether to use alpha or luminosity for the sMask.
     *
     *  These are not de-duped.
     */
    SkPDFIndirectReference GetSMaskGraphicState(SkPDFIndirectReference sMask,
                                                bool invert,
                                                SkPDFSMaskMode sMaskMode,
                                                SkPDFDocument* doc);
}  // namespace SkPDFGraphicState

SK_BEGIN_REQUIRE_DENSE
struct SkPDFStrokeGraphicState {
    SkScalar fStrokeWidth;
    SkScalar fStrokeMiter;
    SkScalar fAlpha;
    uint8_t fStrokeCap;   // SkPaint::Cap
    uint8_t fStrokeJoin;  // SkPaint::Join
    uint8_t fBlendMode;   // SkBlendMode
    uint8_t fPADDING = 0;
    bool operator==(const SkPDFStrokeGraphicState& o) const { return !memcmp(this, &o, sizeof(o)); }
    bool operator!=(const SkPDFStrokeGraphicState& o) const { return !(*this == o); }

    using Hash = SkForceDirectHash<SkPDFStrokeGraphicState>;
};
SK_END_REQUIRE_DENSE

SK_BEGIN_REQUIRE_DENSE
struct SkPDFFillGraphicState {
    SkScalar fAlpha;
    uint8_t fBlendMode;
    uint8_t fPADDING[3] = {0, 0, 0};
    bool operator==(const SkPDFFillGraphicState& o) const { return !memcmp(this, &o, sizeof(o)); }
    bool operator!=(const SkPDFFillGraphicState& o) const { return !(*this == o); }

    using Hash = SkForceDirectHash<SkPDFFillGraphicState>;
};
SK_END_REQUIRE_DENSE

#endif