| Copyright | (C) 2015 Dimitri Sabadie |
|---|---|
| License | BSD3 |
| Maintainer | Dimitri Sabadie <dimitri.sabadie@gmail.com> |
| Stability | experimental |
| Portability | portable |
| Safe Haskell | None |
| Language | Haskell2010 |
Graphics.Luminance.Blending
Contents
Description
That module exports blending-related types and functions.
Given two pixels src and dst – source and destination, we associate
each pixel a blending factor – respectively, srcK and dstK. src is
the pixel being computed, and dst is the pixel that is already stored in
the framebuffer.
The pixels can be blended in several ways. See the documentation of
BlendingMode for further details.
The factors are encoded with BlendingFactor.
Blending modes
data BlendingMode Source
All different blending modes.
Additive represents the following blending equation:
blended = src * srcK + dst * dstK
Subtract represents the following blending equation:
blended = src * srcK - dst * dstK
Because subtracting is not commutating, ReverseSubtract represents the following additional
blending equation:
blended = dst * dstK - src * srcK
Min represents the following blending equation:
blended = min src dstMax represents the following blending equation:
blended = max src dstConstructors
| Additive | |
| Subtract | |
| ReverseSubtract | |
| Min | |
| Max |
Instances
Blending factors
data BlendingFactor Source
Blending factors.
Constructors
| One | 1 * color = factor |
| Zero | 0 * color = 0 |
| SrcColor | src * color |
| NegativeSrcColor | (1 - src) * color |
| DestColor | dst * color |
| NegativeDestColor | (1 - dst) * color |
| SrcAlpha | srcA * color |
| NegativeSrcAlpha | (1 - src) * color |
| DstAlpha | dstA * color |
| NegativeDstAlpha | (1 - dstA) * color |
| SrcAlphaSaturate |
Instances