cc836871cb
Change-Id: Ie704f0f83b1034ff8ee1a5d3cd194e555cae20a3 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/252600 Commit-Queue: Michael Ludwig <michaelludwig@google.com> Commit-Queue: Mike Klein <mtklein@google.com> Auto-Submit: Michael Ludwig <michaelludwig@google.com> Reviewed-by: Mike Klein <mtklein@google.com>
94 lines
4.9 KiB
C
94 lines
4.9 KiB
C
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkBlendMode_DEFINED
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#define SkBlendMode_DEFINED
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#include "include/core/SkTypes.h"
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enum class SkBlendMode {
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kClear, //!< replaces destination with zero: fully transparent
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kSrc, //!< replaces destination
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kDst, //!< preserves destination
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kSrcOver, //!< source over destination
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kDstOver, //!< destination over source
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kSrcIn, //!< source trimmed inside destination
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kDstIn, //!< destination trimmed by source
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kSrcOut, //!< source trimmed outside destination
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kDstOut, //!< destination trimmed outside source
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kSrcATop, //!< source inside destination blended with destination
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kDstATop, //!< destination inside source blended with source
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kXor, //!< each of source and destination trimmed outside the other
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kPlus, //!< sum of colors
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kModulate, //!< product of premultiplied colors; darkens destination
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kScreen, //!< multiply inverse of pixels, inverting result; brightens destination
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kLastCoeffMode = kScreen, //!< last porter duff blend mode
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kOverlay, //!< multiply or screen, depending on destination
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kDarken, //!< darker of source and destination
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kLighten, //!< lighter of source and destination
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kColorDodge, //!< brighten destination to reflect source
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kColorBurn, //!< darken destination to reflect source
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kHardLight, //!< multiply or screen, depending on source
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kSoftLight, //!< lighten or darken, depending on source
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kDifference, //!< subtract darker from lighter with higher contrast
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kExclusion, //!< subtract darker from lighter with lower contrast
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kMultiply, //!< multiply source with destination, darkening image
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kLastSeparableMode = kMultiply, //!< last blend mode operating separately on components
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kHue, //!< hue of source with saturation and luminosity of destination
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kSaturation, //!< saturation of source with hue and luminosity of destination
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kColor, //!< hue and saturation of source with luminosity of destination
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kLuminosity, //!< luminosity of source with hue and saturation of destination
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kLastMode = kLuminosity, //!< last valid value
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};
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/**
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* For Porter-Duff SkBlendModes (those <= kLastCoeffMode), these coefficients describe the blend
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* equation used. Coefficient-based blend modes specify an equation:
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* ('dstCoeff' * dst + 'srcCoeff' * src), where the coefficient values are constants, functions of
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* the src or dst alpha, or functions of the src or dst color.
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*/
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enum class SkBlendModeCoeff {
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kZero, /** 0 */
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kOne, /** 1 */
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kSC, /** src color */
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kISC, /** inverse src color (i.e. 1 - sc) */
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kDC, /** dst color */
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kIDC, /** inverse dst color (i.e. 1 - dc) */
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kSA, /** src alpha */
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kISA, /** inverse src alpha (i.e. 1 - sa) */
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kDA, /** dst alpha */
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kIDA, /** inverse dst alpha (i.e. 1 - da) */
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kCoeffCount
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};
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/**
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* Returns true if 'mode' is a coefficient-based blend mode (<= kLastCoeffMode). If true is
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* returned, the mode's src and dst coefficient functions are set in 'src' and 'dst'.
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*/
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SK_API bool SkBlendMode_AsCoeff(SkBlendMode mode, SkBlendModeCoeff* src, SkBlendModeCoeff* dst);
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/** Returns name of blendMode as null-terminated C string.
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@param blendMode one of:
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SkBlendMode::kClear, SkBlendMode::kSrc, SkBlendMode::kDst,
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SkBlendMode::kSrcOver, SkBlendMode::kDstOver, SkBlendMode::kSrcIn,
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SkBlendMode::kDstIn, SkBlendMode::kSrcOut, SkBlendMode::kDstOut,
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SkBlendMode::kSrcATop, SkBlendMode::kDstATop, SkBlendMode::kXor,
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SkBlendMode::kPlus, SkBlendMode::kModulate, SkBlendMode::kScreen,
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SkBlendMode::kOverlay, SkBlendMode::kDarken, SkBlendMode::kLighten,
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SkBlendMode::kColorDodge, SkBlendMode::kColorBurn, SkBlendMode::kHardLight,
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SkBlendMode::kSoftLight, SkBlendMode::kDifference, SkBlendMode::kExclusion,
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SkBlendMode::kMultiply, SkBlendMode::kHue, SkBlendMode::kSaturation,
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SkBlendMode::kColor, SkBlendMode::kLuminosity
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@return C string
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*/
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SK_API const char* SkBlendMode_Name(SkBlendMode blendMode);
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#endif
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