| Copyright | Will Thompson Iñaki García Etxebarria and Jonas Platte |
|---|---|
| License | LGPL-2.1 |
| Maintainer | Iñaki García Etxebarria (garetxe@gmail.com) |
| Safe Haskell | None |
| Language | Haskell2010 |
GI.GdkPixbuf.Enums
Description
Synopsis
- data Colorspace
- data InterpType
- data PixbufAlphaMode
- data PixbufError
- catchPixbufError :: IO a -> (PixbufError -> GErrorMessage -> IO a) -> IO a
- handlePixbufError :: (PixbufError -> GErrorMessage -> IO a) -> IO a -> IO a
- data PixbufRotation
Enumerations
Colorspace
data Colorspace Source #
This enumeration defines the color spaces that are supported by the gdk-pixbuf library. Currently only RGB is supported.
Constructors
| ColorspaceRgb | Indicates a red/green/blue additive color space. |
| AnotherColorspace Int | Catch-all for unknown values |
Instances
InterpType
data InterpType Source #
This enumeration describes the different interpolation modes that
can be used with the scaling functions. gDKINTERPNEAREST is
the fastest scaling method, but has horrible quality when
scaling down. gDKINTERPBILINEAR is the best choice if you
aren't sure what to choose, it has a good speed/quality balance.
<note> Cubic filtering is missing from the list; hyperbolic interpolation is just as fast and results in higher quality. </note>
Constructors
| InterpTypeNearest | Nearest neighbor sampling; this is the fastest and lowest quality mode. Quality is normally unacceptable when scaling down, but may be OK when scaling up. |
| InterpTypeTiles | This is an accurate simulation of the PostScript image operator without any interpolation enabled. Each pixel is rendered as a tiny parallelogram of solid color, the edges of which are implemented with antialiasing. It resembles nearest neighbor for enlargement, and bilinear for reduction. |
| InterpTypeBilinear | Best quality/speed balance; use this mode by default. Bilinear interpolation. For enlargement, it is equivalent to point-sampling the ideal bilinear-interpolated image. For reduction, it is equivalent to laying down small tiles and integrating over the coverage area. |
| InterpTypeHyper | This is the slowest and highest quality reconstruction function. It is derived from the hyperbolic filters in Wolberg's "Digital Image Warping", and is formally defined as the hyperbolic-filter sampling the ideal hyperbolic-filter interpolated image (the filter is designed to be idempotent for 1:1 pixel mapping). |
| AnotherInterpType Int | Catch-all for unknown values |
Instances
PixbufAlphaMode
data PixbufAlphaMode Source #
These values can be passed to
gdk_pixbuf_xlib_render_to_drawable_alpha() to control how the alpha
channel of an image should be handled. This function can create a
bilevel clipping mask (black and white) and use it while painting
the image. In the future, when the X Window System gets an alpha
channel extension, it will be possible to do full alpha
compositing onto arbitrary drawables. For now both cases fall
back to a bilevel clipping mask.
Constructors
| PixbufAlphaModeBilevel | A bilevel clipping mask (black and white) will be created and used to draw the image. Pixels below 0.5 opacity will be considered fully transparent, and all others will be considered fully opaque. |
| PixbufAlphaModeFull | For now falls back to |
| AnotherPixbufAlphaMode Int | Catch-all for unknown values |
Instances
PixbufError
data PixbufError Source #
An error code in the GDK_PIXBUF_ERROR domain. Many gdk-pixbuf
operations can cause errors in this domain, or in the G_FILE_ERROR
domain.
Constructors
| PixbufErrorCorruptImage | An image file was broken somehow. |
| PixbufErrorInsufficientMemory | Not enough memory. |
| PixbufErrorBadOption | A bad option was passed to a pixbuf save module. |
| PixbufErrorUnknownType | Unknown image type. |
| PixbufErrorUnsupportedOperation | Don't know how to perform the given operation on the type of image at hand. |
| PixbufErrorFailed | Generic failure code, something went wrong. |
| PixbufErrorIncompleteAnimation | Only part of the animation was loaded. |
| AnotherPixbufError Int | Catch-all for unknown values |
Instances
catchPixbufError :: IO a -> (PixbufError -> GErrorMessage -> IO a) -> IO a Source #
Catch exceptions of type PixbufError. This is a specialized version of catchGErrorJustDomain.
handlePixbufError :: (PixbufError -> GErrorMessage -> IO a) -> IO a -> IO a Source #
Handle exceptions of type PixbufError. This is a specialized version of handleGErrorJustDomain.
PixbufRotation
data PixbufRotation Source #
The possible rotations which can be passed to pixbufRotateSimple.
To make them easier to use, their numerical values are the actual degrees.
Constructors
| PixbufRotationNone | No rotation. |
| PixbufRotationCounterclockwise | Rotate by 90 degrees. |
| PixbufRotationUpsidedown | Rotate by 180 degrees. |
| PixbufRotationClockwise | Rotate by 270 degrees. |
| AnotherPixbufRotation Int | Catch-all for unknown values |