cairo-pattern: cairo_pattern_t
Description
Sources for drawingMethods and Functions
cairoPatternAddColorStopRgb(pattern, offset, red, green, blue)
cairoPatternAddColorStopRgba(pattern, offset, red, green, blue, alpha)
cairoPatternGetColorStopCount(pattern)
cairoPatternGetColorStopRgba(pattern, index)
cairoPatternCreateRgb(red, green, blue)
cairoPatternCreateRgba(red, green, blue, alpha)
cairoPatternGetRgba(pattern)
cairoPatternCreateForSurface(surface)
cairoPatternGetSurface(pattern)
cairoPatternCreateLinear(x0, y0, x1, y1)
cairoPatternGetLinearPoints(pattern)
cairoPatternCreateRadial(cx0, cy0, radius0, cx1, cy1, radius1)
cairoPatternGetRadialCircles(pattern)
cairoPatternStatus(pattern)
cairoPatternSetExtend(pattern, extend)
cairoPatternGetExtend(pattern)
cairoPatternSetFilter(pattern, filter)
cairoPatternGetFilter(pattern)
cairoPatternSetMatrix(pattern, matrix)
cairoPatternGetMatrix(pattern, matrix)
cairoPatternGetType(pattern)
cairoPatternSetUserData(pattern, key, user.data)
cairoPatternGetUserData(pattern, key)
cairoPattern(red, green, blue, alpha, surface, x0, y0, x1, y1, cx0, cy0, radius0, cx1, cy1, radius1)Detailed Description
CairoPattern is the paint with which cairo draws.
The primary use of patterns is as the source for all cairo drawing operations,
although they can also be used as masks, that is, as the brush too. A cairo pattern is created by using one of the many constructors,
of the form cairo_pattern_create_type()
or implicitly through
cairo_set_source_type() functions.Enums and Flags
CairoExtend-
CairoExtend is used to describe how pattern color/alpha will be
determined for areas "outside" the pattern's natural area, (for
example, outside the surface bounds or outside the gradient
geometry). The default extend mode is CAIRO_EXTEND_NONE for surface patterns
and CAIRO_EXTEND_PAD for gradient patterns. New entries may be added in future versions.
none- pixels outside of the source pattern
are fully transparent
repeat- the pattern is tiled by repeating
reflect- the pattern is tiled by reflecting
at the edges (Implemented for surface patterns since 1.6)
CairoFilter-
CairoFilter is used to indicate what filtering should be
applied when reading pixel values from patterns. See
cairoPatternSetSource() for indicating the desired filter to be
used with a particular pattern.
fast- A high-performance filter, with quality similar
to
CAIRO_FILTER_NEAREST good- A reasonable-performance filter, with quality
similar to
CAIRO_FILTER_BILINEAR best- The highest-quality available, performance may
not be suitable for interactive use.
nearest- Nearest-neighbor filtering
bilinear- Linear interpolation in two dimensions
gaussian- This filter value is currently
unimplemented, and should not be used in current code.
CairoPatternType-
CairoPatternType is used to describe the type of a given pattern. The type of a pattern is determined by the function used to create
it. The cairoPatternCreateRgb and cairoPatternCreateRgba
functions create SOLID patterns. The remaining
cairo_pattern_create functions map to pattern types in obvious
ways. The pattern type can be queried with cairoPatternGetType Most CairoPattern functions can be called with a pattern of any
type, (though trying to change the extend or filter for a solid
pattern will have no effect). A notable exception is
cairoPatternAddColorStopRgb and
cairoPatternAddColorStopRgba which must only be called with
gradient patterns (either LINEAR or RADIAL). Otherwise the pattern
will be shutdown and put into an error state. New entries may be added in future versions.
Since 1.2
solid- The pattern is a solid (uniform)
color. It may be opaque or translucent.
surface- The pattern is a based on a surface (an image).
linear- The pattern is a linear gradient.
radial- The pattern is a radial gradient.