SkCanvas::drawColor SkCanvas::drawVertices SkPaint SkShader::MakeCompose SkXfermodeImageFilter
SkBlendMode::kClear sets destination to: [0, 0]. Use SkBlendMode::kClear to initialize a buffer to fully transparent pixels when creating a mask with irregular edges.
SkCanvas::clear
Given: Sa as source Alpha, Sc as source Color component; SkBlendMode::kSrc sets destination to: [Sa, Sc]. Use SkBlendMode::kSrc to copy one buffer to another. All pixels are copied, regardless of source and destination Alpha values. As a parameter to SkCanvas::drawAtlas, selects sprites and ignores colors.
SkSurface::draw SkSurface::readPixels
Given: Da as destination Alpha, Dc as destination Color component; SkBlendMode::kDst preserves destination set to: [Da, Dc]. Setting Paint Blend_Mode to SkBlendMode::kDst causes drawing with Paint to have no effect. As a parameter to SkCanvas::drawAtlas, selects colors and ignores sprites.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kSrcOver replaces destination with: [Sa + Da * (1 - Sa), Sc + Dc * (1 - Sa)], drawing source over destination. SkBlendMode::kSrcOver is the default for Paint.
SkBlendMode::kSrcOver cannot make destination more transparent; the result will be at least as opaque as the less transparent of source and original destination.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kDstOver replaces destination with: [Da + Sa * (1 - Da), Dc + Sc * (1 - Da)], drawing destination over source. Has no effect destination if is opaque.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha; SkBlendMode::kSrcIn replaces destination with: [Sa * Da, Sc * Da], drawing source with destination opacity.
Given: Sa as source Alpha, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kDstIn replaces destination with: [Da * Sa, Dc * Sa], scaling destination Alpha by source Alpha. Resulting destination is visible where source is visible.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha; SkBlendMode::kSrcOut replaces destination with: [Sa * (1 - Da), Sc * (1 - Da)], drawing source fully where destination Alpha is zero. Is destination is opaque, has no effect.
Given: Sa as source Alpha, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kDstOut replaces destination with: [Da * (1 - Sa), Dc * (1 - Sa)], scaling destination Alpha by source transparency. Resulting destination is visible where source is transparent. If source is transparent, has no effect.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kSrcATop replaces destination with: [Da, Sc * Da + Dc * (1 - Sa)], replacing opaque destination with opaque source. If source or destination is transparent, has no effect.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kDstATop replaces destination with: [Sa, Dc * Sa + Sc * (1 - Da)], making destination transparent where source is transparent.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kXor replaces destination with: [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + Dc * (1 - Sa)], exchanging the transparency of the source and destination.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kPlus replaces destination with: [Sa + Da, Sc + Dc], summing the Alpha and Color components.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kModulate replaces destination with: [Sa * Da, Sc * Dc], scaling Alpha and Color components by the lesser of the values. SkBlendMode::kModulate differs from SkBlendMode::kMultiply in two ways. SkBlendMode::kModulate like SkBlendMode::kSrcATop alters the destination inside the destination area, as if the destination Alpha defined the boundaries of a soft clip. SkBlendMode::kMultiply like SkBlendMode::kSrcOver can alter the destination where the destination is transparent. SkBlendMode::kModulate computes the product of the source and destination using Premultiplied component values. SkBlendMode::kMultiply the product of the source and destination using Unpremultiplied component values.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kScreen replaces destination with: [Sa + Da - Sa * Da, Sc + Dc - Sc * Dc].
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kOverlay 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))].
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kDarken replaces destination with: [Sa + Da - Sa * Da, Sc + Dc - max(Sc * Da, Dc * Sa)]. SkBlendMode::kDarken does not make an image darker; it replaces the destination component with source if source is darker.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kLighten replaces destination with: [Sa + Da - Sa * Da, Sc + Dc - min(Sc * Da, Dc * Sa)]. SkBlendMode::kDarken does not make an image lighter; it replaces the destination component with source if source is lighter.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kColorDodge 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.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kColorBurn 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.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kHardLight 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.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; where m = Da > 0 ? Dc / Da : 0; SkBlendMode::kSoftLight 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.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kDifference replaces destination with: [Sa + Da - Sa * Da, Sc + Dc - 2 * min(Sc * Da, Dc * Sa)], replacing destination with lighter less darker.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kExclusion replaces destination with: [Sa + Da - Sa * Da, Sc + Dc - 2 * Sc * Dc], replacing destination with lighter less darker, ignoring Alpha.
Given: Sa as source Alpha, Sc as source Color component, Da as destination Alpha, Dc as destination Color component; SkBlendMode::kMultiply replaces destination with: [Sa + Da - Sa * Da, Sc * (1 - Da) + Dc * (1 - Sa) + Sc * Dc], the product of Unpremultiplied source and destination. SkBlendMode::kMultiply makes the image darker.
Given: Sa as source Alpha, S as source Color, Da as destination Alpha, D as destination Color; SkBlendMode::kHue replaces destination with: [Sa + Da - Sa * Da, SetLuminosity(SetSaturation(S, Saturation(D)), Luminosity(D))], source hue, leaving destination luminosity and saturation unchanged.
Given: Sa as source Alpha, S as source Color, Da as destination Alpha, D as destination Color; SkBlendMode::kHue replaces destination with: [Sa + Da - Sa * Da, SetLuminosity(SetSaturation(D, Saturation(S)), Luminosity(D))], source hue, leaving destination luminosity and saturation unchanged.
Given: Sa as source Alpha, S as source Color, Da as destination Alpha, D as destination Color; SkBlendMode::kColor replaces destination with: [Sa + Da - Sa * Da, SetLuminosity(S, Luminosity(D))], source hue and saturation, leaving destination luminosity unchanged.
Given: Sa as source Alpha, S as source Color, Da as destination Alpha, D as destination Color; SkBlendMode::kLuminosity replaces destination with: [Sa + Da - Sa * Da, SetLuminosity(D, Luminosity(S))], source luminosity, leaving destination hue and saturation unchanged.
Returns name of blendMode as null-terminated C string.
SkBlendMode::kClear, SkBlendMode::kSrc, SkBlendMode::kDst, SkBlendMode::kSrcOver, SkBlendMode::kDstOver, SkBlendMode::kSrcIn, SkBlendMode::kDstIn, SkBlendMode::kSrcOut, SkBlendMode::kDstOut, SkBlendMode::kSrcATop, SkBlendMode::kDstATop, SkBlendMode::kXor, SkBlendMode::kPlus, SkBlendMode::kModulate, SkBlendMode::kScreen, SkBlendMode::kOverlay, SkBlendMode::kDarken, SkBlendMode::kLighten, SkBlendMode::kColorDodge, SkBlendMode::kColorBurn, SkBlendMode::kHardLight, SkBlendMode::kSoftLight, SkBlendMode::kDifference, SkBlendMode::kExclusion, SkBlendMode::kMultiply, SkBlendMode::kHue, SkBlendMode::kSaturation, SkBlendMode::kColor, SkBlendMode::kLuminosity
C string
default blend: SkBlendMode::kSrcOver
SkBlendMode