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notes for blend mode members

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John Cupitt 2017-12-04 14:26:55 +00:00
parent c5139a0e50
commit dcf8588b97
1 changed files with 28 additions and 26 deletions
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54
libvips/conversion/conversion.c
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@ -132,38 +132,40 @@
/**
* VipsBlendMode:
* VIPS_BLEND_MODE_CLEAR:
* VIPS_BLEND_MODE_SOURCE:
* VIPS_BLEND_MODE_OVER:
* VIPS_BLEND_MODE_IN:
* VIPS_BLEND_MODE_OUT:
* VIPS_BLEND_MODE_ATOP:
* VIPS_BLEND_MODE_DEST:
* VIPS_BLEND_MODE_DEST_OVER:
* VIPS_BLEND_MODE_DEST_IN:
* VIPS_BLEND_MODE_DEST_OUT:
* VIPS_BLEND_MODE_DEST_ATOP:
* VIPS_BLEND_MODE_XOR:
* VIPS_BLEND_MODE_ADD:
* VIPS_BLEND_MODE_SATURATE:
* VIPS_BLEND_MODE_MULTIPLY:
* VIPS_BLEND_MODE_SCREEN:
* VIPS_BLEND_MODE_OVERLAY:
* VIPS_BLEND_MODE_DARKEN:
* VIPS_BLEND_MODE_LIGHTEN:
* VIPS_BLEND_MODE_COLOUR_DODGE:
* VIPS_BLEND_MODE_COLOUR_BURN:
* VIPS_BLEND_MODE_HARD_LIGHT:
* VIPS_BLEND_MODE_SOFT_LIGHT:
* VIPS_BLEND_MODE_DIFFERENCE:
* VIPS_BLEND_MODE_EXCLUSION:
* VIPS_BLEND_MODE_CLEAR: Where the second object is drawn, the first is removed.
* VIPS_BLEND_MODE_SOURCE: The second object is drawn as if nothing were below.
* VIPS_BLEND_MODE_OVER: The image shows what you would expect if you held two semi-transparent slides on top of each other.
* VIPS_BLEND_MODE_IN: The first object is removed completely, the second is only drawn where the first was.
* VIPS_BLEND_MODE_OUT: The second is drawn only where the first isn't.
* VIPS_BLEND_MODE_ATOP: This leaves the first object mostly intact, but mixes both objects in the overlapping area.
* VIPS_BLEND_MODE_DEST: Leaves the first object untouched, the second is discarded completely.
* VIPS_BLEND_MODE_DEST_OVER: Like OVER, but swaps the arguments.
* VIPS_BLEND_MODE_DEST_IN: Like IN, but swaps the arguments.
* VIPS_BLEND_MODE_DEST_OUT: Like OUT, but swaps the arguments.
* VIPS_BLEND_MODE_DEST_ATOP: Like ATOP, but swaps the arguments.
* VIPS_BLEND_MODE_XOR: Something like a difference operator.
* VIPS_BLEND_MODE_ADD: A bit like adding the two images.
* VIPS_BLEND_MODE_SATURATE: A bit like the darker of the two.
* VIPS_BLEND_MODE_MULTIPLY: At least as dark as the darker of the two inputs.
* VIPS_BLEND_MODE_SCREEN: At least as light as the lighter of the inputs.
* VIPS_BLEND_MODE_OVERLAY: Multiplies or screens colors, depending on the lightness.
* VIPS_BLEND_MODE_DARKEN: The darker of each component.
* VIPS_BLEND_MODE_LIGHTEN: The lighter of each component.
* VIPS_BLEND_MODE_COLOUR_DODGE: Brighten first by a factor second.
* VIPS_BLEND_MODE_COLOUR_BURN: Darken first by a factor of second.
* VIPS_BLEND_MODE_HARD_LIGHT: Multiply or screen, depending on lightness.
* VIPS_BLEND_MODE_SOFT_LIGHT: Darken or lighten, depending on lightness.
* VIPS_BLEND_MODE_DIFFERENCE: Difference of the two.
* VIPS_BLEND_MODE_EXCLUSION: Somewhat like DIFFERENCE, but lower-contrast.
*
* The various Porter-Duff and PDF blend modes. See vips_composite_base(),
* The various Porter-Duff and PDF blend modes. See vips_composite(),
* for example.
*
* The Cairo docs have a nice explanation of all the blend modes:
*
* https://www.cairographics.org/operators
*
* The non-separable modes are not implemented.
*/
/**