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diff --git a/site/user/api/SkBlendMode_Reference.md b/site/user/api/SkBlendMode_Reference.md new file mode 100644 index 0000000000..d1bb465851 --- /dev/null +++ b/site/user/api/SkBlendMode_Reference.md @@ -0,0 +1,1050 @@ +SkBlendMode Reference +=== + +# <a name='Blend_Mode'>Blend Mode</a> + +## Overview + +<table style='border-collapse: collapse; width: 62.5em'> + <tr><th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Topic</th> +<th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Description</th></tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Constant'>Constants</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>enum and enum class, and their const values</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Member_Function'>Functions</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>global and class member functions</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Related_Function'>Related Functions</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>similar member functions grouped together</td> + </tr> +</table> + + +## <a name='Member_Function'>Member Function</a> + + +SkBlendMode member functions read and modify the structure properties. +<table style='border-collapse: collapse; width: 62.5em'> + <tr><th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Topic</th> +<th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Description</th></tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_Name'>SkBlendMode Name</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>returns mode as C string</td> + </tr> +</table> + +## <a name='Constant'>Constant</a> + + +SkBlendMode related constants are defined by <code>enum</code>, <code>enum class</code>, <code>#define</code>, <code>const</code>, and <code>constexpr</code>. +<table style='border-collapse: collapse; width: 62.5em'> + <tr><th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Topic</th> +<th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Description</th></tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode'>SkBlendMode</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>algorithm combining source and destination pixels</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kClear'>SkBlendMode::kClear</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>replaces destination with zero: fully transparent</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kColor'>SkBlendMode::kColor</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>hue and saturation of source with luminosity of destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kColorBurn'>SkBlendMode::kColorBurn</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>darken destination to reflect source</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kColorDodge'>SkBlendMode::kColorDodge</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>brighten destination to reflect source</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kDarken'>SkBlendMode::kDarken</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>darker of source and destination</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kDifference'>SkBlendMode::kDifference</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>subtract darker from lighter with higher contrast</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kDst'>SkBlendMode::kDst</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>preserves destination</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kDstATop'>SkBlendMode::kDstATop</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>destination inside source blended with source</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kDstIn'>SkBlendMode::kDstIn</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>destination trimmed by source</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kDstOut'>SkBlendMode::kDstOut</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>destination trimmed outside source</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kDstOver'>SkBlendMode::kDstOver</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>destination over source</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kExclusion'>SkBlendMode::kExclusion</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>subtract darker from lighter with lower contrast</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kHardLight'>SkBlendMode::kHardLight</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>multiply or screen, depending on source</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kHue'>SkBlendMode::kHue</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>hue of source with saturation and luminosity of destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kLastCoeffMode'>SkBlendMode::kLastCoeffMode</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>last <a href='#Porter_Duff'>Porter Duff</a> blend mode</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kLastMode'>SkBlendMode::kLastMode</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>last valid value</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kLastSeparableMode'>SkBlendMode::kLastSeparableMode</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>last blend mode operating separately on components</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kLighten'>SkBlendMode::kLighten</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>lighter of source and destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kLuminosity'>SkBlendMode::kLuminosity</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>luminosity of source with hue and saturation of destination</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>product of <a href='undocumented#Premultiply'>Premultiplied</a> colors; darkens destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>multiply source with destination, darkening image</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kOverlay'>SkBlendMode::kOverlay</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>multiply or screen, depending on destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kPlus'>SkBlendMode::kPlus</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>sum of colors</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kSaturation'>SkBlendMode::kSaturation</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>saturation of source with hue and luminosity of destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kScreen'>SkBlendMode::kScreen</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>multiply inverse of pixels, inverting result; brightens destination</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kSoftLight'>SkBlendMode::kSoftLight</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>lighten or darken, depending on source</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kSrc'>SkBlendMode::kSrc</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>replaces destination</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kSrcATop'>SkBlendMode::kSrcATop</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>source inside destination blended with destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kSrcIn'>SkBlendMode::kSrcIn</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>source trimmed inside destination</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kSrcOut'>SkBlendMode::kSrcOut</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>source trimmed outside destination</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kSrcOver'>SkBlendMode::kSrcOver</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>source over destination</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#SkBlendMode_kXor'>SkBlendMode::kXor</a></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>each of source and destination trimmed outside the other</td> + </tr> +</table> + +Describes how destination pixel is replaced with a combination of itself and +source pixel. <a href='#Blend_Mode'>Blend Mode</a> may use source, destination, or both. <a href='#Blend_Mode'>Blend Mode</a> may +operate on each <a href='#Color'>Color</a> component independently, or may allow all source pixel +components to contribute to one destination pixel component. + +<a href='#Blend_Mode'>Blend Mode</a> does not use adjacent pixels to determine the outcome. + +<a href='#Blend_Mode'>Blend Mode</a> uses source and read destination <a href='SkColor_Reference#Alpha'>Alpha</a> to determine written +destination <a href='SkColor_Reference#Alpha'>Alpha</a>; both source and destination <a href='SkColor_Reference#Alpha'>Alpha</a> may also affect written +destination <a href='#Color'>Color</a> components. + +Regardless of how <a href='SkColor_Reference#Alpha'>Alpha</a> is encoded in source and destination pixel, nearly all +<a href='SkImageInfo_Reference#Color_Type'>Color Types</a> treat it as ranging from zero to one. And, nearly all <a href='#Blend_Mode'>Blend Mode</a> +algorithms limit the output so that all results are also zero to one. + +Two exceptions are <a href='#SkBlendMode_kPlus'>SkBlendMode::kPlus</a> and <a href='SkImageInfo_Reference#kRGBA_F16_SkColorType'>kRGBA_F16_SkColorType</a>. + +<a href='#SkBlendMode_kPlus'>SkBlendMode::kPlus</a> permits computing <a href='SkColor_Reference#Alpha'>Alpha</a> and <a href='#Color'>Color</a> component values larger +than one. For <a href='SkImageInfo_Reference#Color_Type'>Color Types</a> other than <a href='SkImageInfo_Reference#kRGBA_F16_SkColorType'>kRGBA_F16_SkColorType</a>, resulting <a href='SkColor_Reference#Alpha'>Alpha</a> +and component values are clamped to one. + +<a href='SkImageInfo_Reference#kRGBA_F16_SkColorType'>kRGBA_F16_SkColorType</a> permits values outside the zero to one range. It is up +to the client to ensure that the result is within the range of zero to one, +and therefore well-defined. + +## <a name='Porter_Duff'>Porter Duff</a> + +<a href='https://graphics.pixar.com/library/Compositing/paper.pdf'>Compositing Digital Images</a></a> describes <a href='#Porter_Duff'>Porter Duff</a> modes <a href='#SkBlendMode_kClear'>SkBlendMode::kClear</a> through <a href='#SkBlendMode_kXor'>SkBlendMode::kXor</a>. + +Drawing a bitmap with transparency using <a href='#Porter_Duff'>Porter Duff</a> compositing is free to clear +the destination. + + + +Draw geometry with transparency using <a href='#Porter_Duff'>Porter Duff</a> compositing does not combine +transparent source pixels, leaving the destination outside the geometry untouched. + + + +## <a name='Lighten_Darken'>Lighten Darken</a> + +Modes <a href='#SkBlendMode_kPlus'>SkBlendMode::kPlus</a> and <a href='#SkBlendMode_kScreen'>SkBlendMode::kScreen</a> use +simple arithmetic to lighten or darken the destination. Modes +<a href='#SkBlendMode_kOverlay'>SkBlendMode::kOverlay</a> through <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> use more complicated +algorithms to lighten or darken; sometimes one mode does both, as described by <a href='https://en.wikipedia.org/wiki/Blend_modes'>Blend Modes</a></a> . + + + +## <a name='Modulate_Blend'>Modulate Blend</a> + +<a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a> is a mashup of <a href='#SkBlendMode_kSrcATop'>SkBlendMode::kSrcATop</a> and <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a>. +It multiplies all components, including <a href='SkColor_Reference#Alpha'>Alpha</a>; unlike <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a>, if either +source or destination is transparent, result is transparent. <a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a> +uses <a href='undocumented#Premultiply'>Premultiplied</a> values to compute the product; <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> uses <a href='undocumented#Unpremultiply'>Unpremultiplied</a> +values to compute the product. + + + +## <a name='Color_Blends'>Color Blends</a> + +Modes <a href='#SkBlendMode_kHue'>SkBlendMode::kHue</a>, <a href='#SkBlendMode_kSaturation'>SkBlendMode::kSaturation</a>, <a href='#SkBlendMode_kColor'>SkBlendMode::kColor</a>, and +<a href='#SkBlendMode_kLuminosity'>SkBlendMode::kLuminosity</a> convert source and destination pixels using all +components color information, using <a href='https://www.w3.org/TR/compositing-1/#blendingnonseparable'>non-separable blend modes</a></a> . + + + +## <a name='SkBlendMode'>Enum SkBlendMode</a> + +<pre style="padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0"> + enum class <a href='#SkBlendMode'>SkBlendMode</a> { + <a href='#SkBlendMode_kClear'>kClear</a>, + <a href='#SkBlendMode_kSrc'>kSrc</a>, + <a href='#SkBlendMode_kDst'>kDst</a>, + <a href='#SkBlendMode_kSrcOver'>kSrcOver</a>, + <a href='#SkBlendMode_kDstOver'>kDstOver</a>, + <a href='#SkBlendMode_kSrcIn'>kSrcIn</a>, + <a href='#SkBlendMode_kDstIn'>kDstIn</a>, + <a href='#SkBlendMode_kSrcOut'>kSrcOut</a>, + <a href='#SkBlendMode_kDstOut'>kDstOut</a>, + <a href='#SkBlendMode_kSrcATop'>kSrcATop</a>, + <a href='#SkBlendMode_kDstATop'>kDstATop</a>, + <a href='#SkBlendMode_kXor'>kXor</a>, + <a href='#SkBlendMode_kPlus'>kPlus</a>, + <a href='#SkBlendMode_kModulate'>kModulate</a>, + <a href='#SkBlendMode_kScreen'>kScreen</a>, + <a href='#SkBlendMode_kLastCoeffMode'>kLastCoeffMode</a> = <a href='#SkBlendMode_kScreen'>kScreen</a>, + <a href='#SkBlendMode_kOverlay'>kOverlay</a>, + <a href='#SkBlendMode_kDarken'>kDarken</a>, + <a href='#SkBlendMode_kLighten'>kLighten</a>, + <a href='#SkBlendMode_kColorDodge'>kColorDodge</a>, + <a href='#SkBlendMode_kColorBurn'>kColorBurn</a>, + <a href='#SkBlendMode_kHardLight'>kHardLight</a>, + <a href='#SkBlendMode_kSoftLight'>kSoftLight</a>, + <a href='#SkBlendMode_kDifference'>kDifference</a>, + <a href='#SkBlendMode_kExclusion'>kExclusion</a>, + <a href='#SkBlendMode_kMultiply'>kMultiply</a>, + <a href='#SkBlendMode_kLastSeparableMode'>kLastSeparableMode</a> = <a href='#SkBlendMode_kMultiply'>kMultiply</a>, + <a href='#SkBlendMode_kHue'>kHue</a>, + <a href='#SkBlendMode_kSaturation'>kSaturation</a>, + <a href='#SkBlendMode_kColor'>kColor</a>, + <a href='#SkBlendMode_kLuminosity'>kLuminosity</a>, + <a href='#SkBlendMode_kLastMode'>kLastMode</a> = <a href='#SkBlendMode_kLuminosity'>kLuminosity</a>, + }; +</pre> + +### Constants + +<table style='border-collapse: collapse; width: 62.5em'> + <tr><th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Const</th> +<th style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>Value</th> +<th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Details</th> +<th style='text-align: left; border: 2px solid #dddddd; padding: 8px; '>Description</th></tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kClear'><code>SkBlendMode::kClear</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>0</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Clear'>Blend Mode Clear</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with <a href='SkColor_Reference#Alpha'>Alpha</a> and <a href='#Color'>Color</a> components set to zero; +a fully transparent pixel. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kSrc'><code>SkBlendMode::kSrc</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>1</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Src'>Blend Mode Src</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with source. Destination alpha and color component values +are ignored. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kDst'><code>SkBlendMode::kDst</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>2</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Dst'>Blend Mode Dst</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Preserves destination, ignoring source. Drawing with <a href='SkPaint_Reference#Paint'>Paint</a> set to <a href='#SkBlendMode_kDst'>kDst</a> has +no effect. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kSrcOver'><code>SkBlendMode::kSrcOver</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>3</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Src_Over'>Blend Mode Src Over</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with source blended with destination. If source is opaque, +replaces destination with source. Used as the default <a href='#Blend_Mode'>Blend Mode</a> for <a href='SkPaint_Reference#SkPaint'>SkPaint</a>. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kDstOver'><code>SkBlendMode::kDstOver</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>4</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Dst_Over'>Blend Mode Dst Over</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with destination blended with source. If destination is opaque, +has no effect. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kSrcIn'><code>SkBlendMode::kSrcIn</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>5</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Src_In'>Blend Mode Src In</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with source using destination opacity. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kDstIn'><code>SkBlendMode::kDstIn</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>6</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Dst_In'>Blend Mode Dst In</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Scales destination opacity by source opacity. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kSrcOut'><code>SkBlendMode::kSrcOut</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>7</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Src_Out'>Blend Mode Src Out</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with source using the inverse of destination opacity, +drawing source fully where destination opacity is zero. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kDstOut'><code>SkBlendMode::kDstOut</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>8</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Dst_Out'>Blend Mode Dst Out</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination opacity with inverse of source opacity. If source is +transparent, has no effect. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kSrcATop'><code>SkBlendMode::kSrcATop</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>9</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Src_Atop'>Blend Mode Src Atop</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Blends destination with source using read destination opacity. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kDstATop'><code>SkBlendMode::kDstATop</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>10</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Dst_Atop'>Blend Mode Dst Atop</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Blends destination with source using source opacity. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kXor'><code>SkBlendMode::kXor</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>11</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Xor'>Blend Mode Xor</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Blends destination by exchanging transparency of the source and destination. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kPlus'><code>SkBlendMode::kPlus</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>12</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Plus'>Blend Mode Plus</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with source and destination added together. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kModulate'><code>SkBlendMode::kModulate</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>13</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Modulate'>Blend Mode Modulate</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with source and destination multiplied together. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kScreen'><code>SkBlendMode::kScreen</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>14</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Screen'>Blend Mode Screen</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with inverted source and destination multiplied together. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kLastCoeffMode'><code>SkBlendMode::kLastCoeffMode</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>14</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +last Porter_Duff blend mode</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kOverlay'><code>SkBlendMode::kOverlay</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>15</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Overlay'>Blend Mode Overlay</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with multiply or screen, depending on destination. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kDarken'><code>SkBlendMode::kDarken</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>16</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Darken'>Blend Mode Darken</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with darker of source and destination. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kLighten'><code>SkBlendMode::kLighten</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>17</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Lighten'>Blend Mode Lighten</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces destination with lighter of source and destination. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kColorDodge'><code>SkBlendMode::kColorDodge</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>18</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Color_Dodge'>Blend Mode Color Dodge</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Makes destination brighter to reflect source. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kColorBurn'><code>SkBlendMode::kColorBurn</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>19</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Color_Burn'>Blend Mode Color Burn</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Makes destination darker to reflect source. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kHardLight'><code>SkBlendMode::kHardLight</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>20</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Hard_Light'>Blend Mode Hard Light</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Makes destination lighter or darker, depending on source. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kSoftLight'><code>SkBlendMode::kSoftLight</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>21</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Soft_Light'>Blend Mode Soft Light</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Makes destination lighter or darker, depending on source. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kDifference'><code>SkBlendMode::kDifference</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>22</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Difference'>Blend Mode Difference</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Subtracts darker from lighter with higher contrast. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kExclusion'><code>SkBlendMode::kExclusion</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>23</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Exclusion'>Blend Mode Exclusion</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Subtracts darker from lighter with lower contrast. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kMultiply'><code>SkBlendMode::kMultiply</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>24</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Multiply'>Blend Mode Multiply</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Multiplies source with destination, darkening image. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kLastSeparableMode'><code>SkBlendMode::kLastSeparableMode</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>24</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Last blend mode operating separately on components. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kHue'><code>SkBlendMode::kHue</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>25</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Hue'>Blend Mode Hue</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces hue of destination with hue of source, leaving saturation and luminosity +unchanged. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kSaturation'><code>SkBlendMode::kSaturation</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>26</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Saturation'>Blend Mode Saturation</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces saturation of destination saturation hue of source, leaving hue and +luminosity unchanged. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kColor'><code>SkBlendMode::kColor</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>27</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Color'>Blend Mode Color</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces hue and saturation of destination with hue and saturation of source, +leaving luminosity unchanged. +</td> + </tr> + <tr style='background-color: #f0f0f0; '> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kLuminosity'><code>SkBlendMode::kLuminosity</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>28</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a href='#Blend_Mode_Luminosity'>Blend Mode Luminosity</a> </td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Replaces luminosity of destination with luminosity of source, leaving hue and +saturation unchanged. +</td> + </tr> + <tr> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '><a name='SkBlendMode_kLastMode'><code>SkBlendMode::kLastMode</code></a></td> + <td style='text-align: center; border: 2px solid #dddddd; padding: 8px; '>28</td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '></td> + <td style='text-align: left; border: 2px solid #dddddd; padding: 8px; '> +Used by tests to iterate through all valid values. +</td> + </tr> +</table> + +### See Also + +<a href='SkCanvas_Reference#SkCanvas_drawColor'>SkCanvas::drawColor</a> <a href='SkCanvas_Reference#SkCanvas_drawVertices'>SkCanvas::drawVertices</a><sup><a href='SkCanvas_Reference#SkCanvas_drawVertices_2'>[2]</a></sup> <a href='SkPaint_Reference#SkPaint'>SkPaint</a> <a href='undocumented#SkShader_MakeCompose'>SkShader::MakeCompose</a> <a href='undocumented#SkXfermodeImageFilter'>SkXfermodeImageFilter</a> + +## <a name='Clear'>Clear</a> + +<a href='#SkBlendMode_kClear'>SkBlendMode::kClear</a> sets destination to: +[0, 0] +. +Use <a href='#SkBlendMode_kClear'>SkBlendMode::kClear</a> to initialize a buffer to fully transparent pixels when +creating a mask with irregular edges. + +### Example + +<div><fiddle-embed name="a9b56a26ca469bab9ab10e16f62fb2e2"><div><a href='SkColor_Reference#SK_ColorYELLOW'>SK ColorYELLOW</a> is ignored because <a href='#SkBlendMode_kClear'>SkBlendMode::kClear</a> ignores the source pixel +value and the destination pixel value, always setting the destination to zero. +</div></fiddle-embed></div> + +### See Also + +<a href='SkCanvas_Reference#SkCanvas_clear'>SkCanvas::clear</a> + +## <a name='Src'>Src</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kSrc'>SkBlendMode::kSrc</a> sets destination to: +[Sa, Sc] +. +Use <a href='#SkBlendMode_kSrc'>SkBlendMode::kSrc</a> to copy one buffer to another. All pixels are copied, +regardless of source and destination <a href='SkColor_Reference#Alpha'>Alpha</a> values. As a parameter to +<a href='SkCanvas_Reference#SkCanvas_drawAtlas'>SkCanvas::drawAtlas</a>, selects sprites and ignores colors. + +### Example + +<div><fiddle-embed name="0fc85dd916cc1a5896d36c80b9847391"><div><a href='#SkBlendMode_kSrc'>SkBlendMode::kSrc</a> does not blend transparent pixels with existing background; +it punches a transparent hole in the existing image. +</div></fiddle-embed></div> + +### See Also + +<a href='SkSurface_Reference#SkSurface_draw'>SkSurface::draw</a><sup><a href='SkSurface_Reference#SkSurface_draw_2'>[2]</a></sup> <a href='SkSurface_Reference#SkSurface_readPixels'>SkSurface::readPixels</a><sup><a href='SkSurface_Reference#SkSurface_readPixels_2'>[2]</a></sup><sup><a href='SkSurface_Reference#SkSurface_readPixels_3'>[3]</a></sup> + +## <a name='Dst'>Dst</a> + +Given: +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kDst'>SkBlendMode::kDst</a> preserves destination set to: +[Da, Dc] +. +Setting <a href='SkPaint_Reference#Paint'>Paint</a> <a href='#Blend_Mode'>Blend Mode</a> to <a href='#SkBlendMode_kDst'>SkBlendMode::kDst</a> causes drawing with +<a href='SkPaint_Reference#Paint'>Paint</a> to have no effect. As a parameter to <a href='SkCanvas_Reference#SkCanvas_drawAtlas'>SkCanvas::drawAtlas</a>, +selects colors and ignores sprites. + +### Example + +<div><fiddle-embed name="35915a2273be1076f00f2e47998ce808"></fiddle-embed></div> + +## <a name='Src_Over'>Src Over</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kSrcOver'>SkBlendMode::kSrcOver</a> replaces destination with: +[Sa + Da * (1 - Sa), Sc + Dc * (1 - Sa)] +, +drawing source over destination. <a href='#SkBlendMode_kSrcOver'>SkBlendMode::kSrcOver</a> is the default for <a href='SkPaint_Reference#Paint'>Paint</a>. + +<a href='#SkBlendMode_kSrcOver'>SkBlendMode::kSrcOver</a> cannot make destination more transparent; the result will +be at least as opaque as the less transparent of source and original destination. + +### Example + +<div><fiddle-embed name="2ea9c149964a06cdb4929158cb4f15f8"></fiddle-embed></div> + +## <a name='Dst_Over'>Dst Over</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kDstOver'>SkBlendMode::kDstOver</a> replaces destination with: +[Da + Sa * (1 - Da), Dc + Sc * (1 - Da)] +, +drawing destination over source. Has no effect destination if is opaque. + +### Example + +<div><fiddle-embed name="10dbb4d97902956ef5f5f8562f65119e"></fiddle-embed></div> + +## <a name='Src_In'>Src In</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>; +<a href='#SkBlendMode_kSrcIn'>SkBlendMode::kSrcIn</a> replaces destination with: +[Sa * Da, Sc * Da] +, +drawing source with destination opacity. + +### Example + +<div><fiddle-embed name="b0833c18fe8b0eeaab9bd6d2160d272f"></fiddle-embed></div> + +## <a name='Dst_In'>Dst In</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kDstIn'>SkBlendMode::kDstIn</a> replaces destination with: +[Da * Sa, Dc * Sa] +, +scaling destination <a href='SkColor_Reference#Alpha'>Alpha</a> by source <a href='SkColor_Reference#Alpha'>Alpha</a>. Resulting +destination is visible where source is visible. + +### Example + +<div><fiddle-embed name="a5eeba05ccf6097a5d110a9d64f97c25"></fiddle-embed></div> + +## <a name='Src_Out'>Src Out</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>; +<a href='#SkBlendMode_kSrcOut'>SkBlendMode::kSrcOut</a> replaces destination with: +[Sa * (1 - Da), Sc * (1 - Da)] +, +drawing source fully where destination <a href='SkColor_Reference#Alpha'>Alpha</a> is zero. Is destination +is opaque, has no effect. + +### Example + +<div><fiddle-embed name="ccc1e74226e0c9eacbc21f1eed017b84"></fiddle-embed></div> + +## <a name='Dst_Out'>Dst Out</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kDstOut'>SkBlendMode::kDstOut</a> replaces destination with: +[Da * (1 - Sa), Dc * (1 - Sa)] +, +scaling destination <a href='SkColor_Reference#Alpha'>Alpha</a> by source transparency. Resulting +destination is visible where source is transparent. If source is transparent, +has no effect. + +### Example + +<div><fiddle-embed name="b9a894c9accfc5d94081bbd77d5d790a"></fiddle-embed></div> + +## <a name='Src_Atop'>Src Atop</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kSrcATop'>SkBlendMode::kSrcATop</a> replaces destination with: +[Da, Sc * Da + Dc * (1 - Sa)] +, +replacing opaque destination with opaque source. If source or destination +is transparent, has no effect. + +### Example + +<div><fiddle-embed name="a13148977bfc985934a92752c83a2041"></fiddle-embed></div> + +## <a name='Dst_Atop'>Dst Atop</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kDstATop'>SkBlendMode::kDstATop</a> replaces destination with: +[Sa, Dc * Sa + Sc * (1 - Da)] +, +making destination transparent where source is transparent. + +### Example + +<div><fiddle-embed name="1955856d45773a4fd914fcc1f813222f"></fiddle-embed></div> + +## <a name='Xor'>Xor</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kXor'>SkBlendMode::kXor</a> replaces destination with: +[Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + Dc * (1 - Sa)] +, +exchanging the transparency of the source and destination. + +### Example + +<div><fiddle-embed name="29db2c7493d9098b8a086ddbe30dd6d6"></fiddle-embed></div> + +## <a name='Plus'>Plus</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kPlus'>SkBlendMode::kPlus</a> replaces destination with: +[Sa + Da, Sc + Dc] +, +summing the <a href='SkColor_Reference#Alpha'>Alpha</a> and <a href='#Color'>Color</a> components. + +### Example + +<div><fiddle-embed name="05383441e510d54008402e128fc8ad2b"></fiddle-embed></div> + +## <a name='Modulate'>Modulate</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a> replaces destination with: +[Sa * Da, Sc * Dc] +, +scaling <a href='SkColor_Reference#Alpha'>Alpha</a> and <a href='#Color'>Color</a> components by the lesser of the values. +<a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a> differs from <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> in two ways. +<a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a> like <a href='#SkBlendMode_kSrcATop'>SkBlendMode::kSrcATop</a> alters the destination inside +the destination area, as if the destination <a href='SkColor_Reference#Alpha'>Alpha</a> defined the boudaries of a +soft clip. <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> like <a href='#SkBlendMode_kSrcOver'>SkBlendMode::kSrcOver</a> can alter the +destination where the destination is transparent. +<a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a> computes the product of the source and destination using +<a href='undocumented#Premultiply'>Premultiplied</a> component values. <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> the product of the source +and destination using <a href='undocumented#Unpremultiply'>Unpremultiplied</a> component values. + +### Example + +<div><fiddle-embed name="3fdac2b2f48bd227d2e74234c260bc8e"><div>If source and destination are opaque, <a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a> and +<a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> produce the same results. +</div></fiddle-embed></div> + +## <a name='Screen'>Screen</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kScreen'>SkBlendMode::kScreen</a> replaces destination with: +[Sa + Da - Sa * Da, Sc + Dc - Sc * Dc] +. + +### Example + +<div><fiddle-embed name="b7b42965927788d853f449f08ddf46de"></fiddle-embed></div> + +## <a name='Overlay'>Overlay</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kOverlay'>SkBlendMode::kOverlay</a> replaces destination with: +[Sa + Da - Sa * Da, Sc * (1 - Da) + Dc * (1 - Sa) + +(2 * Dc <= Da ? 2 * Sc * Dc : Sa * Da - 2 * (Da - Dc) * (Sa - Sc))] +. + +### Example + +<div><fiddle-embed name="03bf042201de02d6d131938ccd3172eb"></fiddle-embed></div> + +## <a name='Darken'>Darken</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kDarken'>SkBlendMode::kDarken</a> replaces destination with: +[Sa + Da - Sa * Da, Sc + Dc - max(Sc * Da, Dc * Sa)] +. +<a href='#SkBlendMode_kDarken'>SkBlendMode::kDarken</a> does not make an image darker; it replaces the destination +component with source if source is darker. + +### Example + +<div><fiddle-embed name="8c5065ba642f815602000f6b53cefc48"></fiddle-embed></div> + +## <a name='Lighten'>Lighten</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kLighten'>SkBlendMode::kLighten</a> replaces destination with: +[Sa + Da - Sa * Da, Sc + Dc - min(Sc * Da, Dc * Sa)] +. +<a href='#SkBlendMode_kDarken'>SkBlendMode::kDarken</a> does not make an image lighter; it replaces the destination +component with source if source is lighter. + +### Example + +<div><fiddle-embed name="bbbe1a7b2587e76f9b2c7996b188a054"></fiddle-embed></div> + +## <a name='Color_Dodge'>Color Dodge</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kColorDodge'>SkBlendMode::kColorDodge</a> replaces destination with: +[Sa + Da - Sa * Da, Dc == 0 ? Sc * (1 - Da) : Sc == Sa ? Sc + Da * (1 - Sa) : +Sa * min(Da, Dc * Sa / (Sa - Sc)) + Sc * (1 - Da) + Da * (1 - Sa)] +, +making destination brighter to reflect source. + +### Example + +<div><fiddle-embed name="280ad6267a7d2d77b6d2c4531c6fc0bf"></fiddle-embed></div> + +## <a name='Color_Burn'>Color Burn</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kColorBurn'>SkBlendMode::kColorBurn</a> replaces destination with: +[Sa + Da - Sa * Da, Dc == Da ? Dc + Sc * (1 - Da) : Sc == 0 ? Da * (1 - Sa) : +Sa * (Da - min(Da, (Da - Dc) * Sa / Sc)) + Sc * (1 - Da) + Da * (1 - Sa)] +, +making destination darker to reflect source. + +### Example + +<div><fiddle-embed name="3eeef529375d8083ae0d615789d55e89"></fiddle-embed></div> + +## <a name='Hard_Light'>Hard Light</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kHardLight'>SkBlendMode::kHardLight</a> replaces destination with: +[Sa + Da - Sa * Da, Sc * (1 - Da) + Dc * (1 - Sa) + +2 * Sc <= Sa ? 2 * Sc * Dc : Sa * Da - 2 * (Da - Dc) * (Sa - Sc)] +, +making destination lighter or darker, depending on source. + +### Example + +<div><fiddle-embed name="ac2fe555e2196e15863ea4ce74db3d54"></fiddle-embed></div> + +## <a name='Soft_Light'>Soft Light</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component +where m = Da > 0 ? Dc / Da : 0; +<a href='#SkBlendMode_kSoftLight'>SkBlendMode::kSoftLight</a> replaces destination with: +[Sa + Da - Sa * Da, Sc / Da + Dc / Sa + +(2 * Sc <= Sa ? Dc * (Sa + (2 * Sc - Sa) * (1 - m)) : Dc * Sa + Da * (2 * Sc - Sa) * +(4 * Dc <= Da ? (16 * m * m + 4 * m) * (m - 1) + 7 * m : sqrt(m) - m))]\ +, +making destination lighter or darker, depending on source. + +### Example + +<div><fiddle-embed name="ac93f30dff13f8a8bb31398de370863b"></fiddle-embed></div> + +## <a name='Difference'>Difference</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kDifference'>SkBlendMode::kDifference</a> replaces destination with: +[Sa + Da - Sa * Da, Sc + Dc - 2 * min(Sc * Da, Dc * Sa)] +, +replacing destination with lighter less darker. + +### Example + +<div><fiddle-embed name="52d2c8d1b9b428de4477b4caa1543a3d"></fiddle-embed></div> + +## <a name='Exclusion'>Exclusion</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a>, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kExclusion'>SkBlendMode::kExclusion</a> replaces destination with: +[Sa + Da - Sa * Da, Sc + Dc - 2 * Sc * Dc] +, +replacing destination with lighter less darker, ignoring <a href='SkColor_Reference#Alpha'>Alpha</a>. + +### Example + +<div><fiddle-embed name="a544ee1c67c7c557a9e54d5e99f94bb6"></fiddle-embed></div> + +## <a name='Multiply'>Multiply</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, Sc as source <a href='#Color'>Color</a> component, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, Dc as destination <a href='#Color'>Color</a> component; +<a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> replaces destination with: +[Sa + Da - Sa * Da, Sc * (1 - Da) + Dc * (1 - Sa) + Sc * Dc] +, +the product of <a href='undocumented#Unpremultiply'>Unpremultiplied</a> source and destination. +<a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a> makes the image darker. + +### Example + +<div><fiddle-embed name="145418271d58afc4070e7df42095c750"></fiddle-embed></div> + +## <a name='Hue'>Hue</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, S as source <a href='#Color'>Color</a>, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, D as destination <a href='#Color'>Color</a>; +<a href='#SkBlendMode_kHue'>SkBlendMode::kHue</a> replaces destination with: +[Sa + Da - Sa * Da, SetLuminosity(SetSaturation(S, Saturation(D)), <a href='#Luminosity'>Luminosity(D)</a>)] +, +source hue, leaving destination luminosity and saturation unchanged. + +### Example + +<div><fiddle-embed name="ade7ea4d06775cb252a1d15c7a8112d3"></fiddle-embed></div> + +## <a name='Saturation'>Saturation</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, S as source <a href='#Color'>Color</a>, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, D as destination <a href='#Color'>Color</a>; +<a href='#SkBlendMode_kHue'>SkBlendMode::kHue</a> replaces destination with: +[Sa + Da - Sa * Da, SetLuminosity(SetSaturation(D, Saturation(S)), <a href='#Luminosity'>Luminosity(D)</a>)] +, +source hue, leaving destination luminosity and saturation unchanged. + +### Example + +<div><fiddle-embed name="4a99f5f6738b18afd92a4cb2bd762bf0"></fiddle-embed></div> + +## <a name='Color'>Color</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, S as source <a href='#Color'>Color</a>, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, D as destination <a href='#Color'>Color</a>; +<a href='#SkBlendMode_kColor'>SkBlendMode::kColor</a> replaces destination with: +[Sa + Da - Sa * Da, SetLuminosity(S, Luminosity(D))] +, +source hue and saturation, leaving destination luminosity unchanged. + +### Example + +<div><fiddle-embed name="953eb53ac00e22d098c1a1290379282e"></fiddle-embed></div> + +## <a name='Luminosity'>Luminosity</a> + +Given: +Sa as source <a href='SkColor_Reference#Alpha'>Alpha</a>, S as source <a href='#Color'>Color</a>, +Da as destination <a href='SkColor_Reference#Alpha'>Alpha</a>, D as destination <a href='#Color'>Color</a>; +<a href='#SkBlendMode_kLuminosity'>SkBlendMode::kLuminosity</a> replaces destination with: +[Sa + Da - Sa * Da, SetLuminosity(D, Luminosity(S))] +, +source luminosity, leaving destination hue and saturation unchanged. + +### Example + +<div><fiddle-embed name="7161fa58aa064ee229ae346cb2e165c4"></fiddle-embed></div> + +<a name='SkBlendMode_Name'></a> +## SkBlendMode_Name + +<pre style="padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0"> +SK_API const char* <a href='#SkBlendMode_Name'>SkBlendMode Name</a>(<a href='#SkBlendMode'>SkBlendMode</a> blendMode) +</pre> + +Returns name of <a href='#SkBlendMode_Name_blendMode'>blendMode</a> as null-terminated C string. + +### Parameters + +<table> <tr> <td><a name='SkBlendMode_Name_blendMode'><code><strong>blendMode</strong></code></a></td> + <td>one of: <a href='#SkBlendMode_kClear'>SkBlendMode::kClear</a>, <a href='#SkBlendMode_kSrc'>SkBlendMode::kSrc</a>, <a href='#SkBlendMode_kDst'>SkBlendMode::kDst</a>, <a href='#SkBlendMode_kSrcOver'>SkBlendMode::kSrcOver</a>, +<a href='#SkBlendMode_kDstOver'>SkBlendMode::kDstOver</a>, <a href='#SkBlendMode_kSrcIn'>SkBlendMode::kSrcIn</a>, <a href='#SkBlendMode_kDstIn'>SkBlendMode::kDstIn</a>, +<a href='#SkBlendMode_kSrcOut'>SkBlendMode::kSrcOut</a>, <a href='#SkBlendMode_kDstOut'>SkBlendMode::kDstOut</a>, <a href='#SkBlendMode_kSrcATop'>SkBlendMode::kSrcATop</a>, +<a href='#SkBlendMode_kDstATop'>SkBlendMode::kDstATop</a>, <a href='#SkBlendMode_kXor'>SkBlendMode::kXor</a>, <a href='#SkBlendMode_kPlus'>SkBlendMode::kPlus</a>, +<a href='#SkBlendMode_kModulate'>SkBlendMode::kModulate</a>, <a href='#SkBlendMode_kScreen'>SkBlendMode::kScreen</a>, <a href='#SkBlendMode_kOverlay'>SkBlendMode::kOverlay</a>, +<a href='#SkBlendMode_kDarken'>SkBlendMode::kDarken</a>, <a href='#SkBlendMode_kLighten'>SkBlendMode::kLighten</a>, <a href='#SkBlendMode_kColorDodge'>SkBlendMode::kColorDodge</a>, +<a href='#SkBlendMode_kColorBurn'>SkBlendMode::kColorBurn</a>, <a href='#SkBlendMode_kHardLight'>SkBlendMode::kHardLight</a>, <a href='#SkBlendMode_kSoftLight'>SkBlendMode::kSoftLight</a>, +<a href='#SkBlendMode_kDifference'>SkBlendMode::kDifference</a>, <a href='#SkBlendMode_kExclusion'>SkBlendMode::kExclusion</a>, <a href='#SkBlendMode_kMultiply'>SkBlendMode::kMultiply</a>, +<a href='#SkBlendMode_kHue'>SkBlendMode::kHue</a>, <a href='#SkBlendMode_kSaturation'>SkBlendMode::kSaturation</a>, <a href='#SkBlendMode_kColor'>SkBlendMode::kColor</a>, +<a href='#SkBlendMode_kLuminosity'>SkBlendMode::kLuminosity</a> </td> + </tr> +</table> + +### Return Value + +C string + +### Example + +<div><fiddle-embed name="3996f4994bf4e90b4cd86524c1f9f1a6"> + +#### Example Output + +~~~~ +default blend: SkBlendMode::kSrcOver +~~~~ + +</fiddle-embed></div> + +### See Also + +<a href='#SkBlendMode'>SkBlendMode</a> + +--- + |