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cairo

MoonBit bindings for the Cairo 2D graphics library

cairo
graphics
ffi
bindings
moon add tonyfettes/cairo@0.2.0
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Version
0.2.0
License
Apache-2.0
Repository
Last updated
23 days ago
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README

#Cairo bindings for MoonBit

This module contains an initial hand-written native binding for representative Cairo APIs. It is deliberately small so the ownership rules and public API can be validated before extending the GIR generator for Cairo.

The current surface covers image and recording surfaces, drawing contexts, path construction, owned path snapshots with typed segments, painting, transforms, status inspection, PNG output, and current-point output parameters. Cairo is discovered at build time with pkg-config cairo.

#
Content

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pub(all) enum Content {
  Color
  Alpha
  ColorAlpha
} derive(Eq, 
Debug)

The color and alpha channels stored by a surface.

#
Context

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type Context

An owned reference to a Cairo drawing context.

#
Context::append_path

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fn Context::append_path(self : Context, path : Path) -> Unit

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Context::arc

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fn Context::arc(self : Context, center_x : Double, center_y : Double, radius : Double, angle_1 : Double, angle_2 : Double) -> Unit

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Context::close_path

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fn Context::close_path(self : Context) -> Unit

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Context::copy_path

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fn Context::copy_path(self : Context) -> Path

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Context::copy_path_flat

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fn Context::copy_path_flat(self : Context) -> Path

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Context::create

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fn Context::create(surface : Surface) -> Context

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Context::curve_to

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fn Context::curve_to(self : Context, x1 : Double, y1 : Double, x2 : Double, y2 : Double, x3 : Double, y3 : Double) -> Unit

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Context::fill

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fn Context::fill(self : Context) -> Unit

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Context::get_current_point

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fn Context::get_current_point(self : Context) -> (Double, Double)

Returns the current path point through Cairo's output-parameter API.

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Context::get_target

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fn Context::get_target(self : Context) -> Surface

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Context::line_to

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fn Context::line_to(self : Context, x : Double, y : Double) -> Unit

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Context::move_to

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fn Context::move_to(self : Context, x : Double, y : Double) -> Unit

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Context::new_path

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fn Context::new_path(self : Context) -> Unit

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Context::paint

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fn Context::paint(self : Context) -> Unit

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Context::rectangle

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fn Context::rectangle(self : Context, x : Double, y : Double, width : Double, height : Double) -> Unit

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Context::restore

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fn Context::restore(self : Context) -> Unit

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Context::rotate

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fn Context::rotate(self : Context, radians : Double) -> Unit

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Context::save

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fn Context::save(self : Context) -> Unit

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Context::scale

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fn Context::scale(self : Context, sx : Double, sy : Double) -> Unit

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Context::set_line_width

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fn Context::set_line_width(self : Context, width : Double) -> Unit

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Context::set_source_rgb

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fn Context::set_source_rgb(self : Context, red : Double, green : Double, blue : Double) -> Unit

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Context::set_source_rgba

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fn Context::set_source_rgba(self : Context, red : Double, green : Double, blue : Double, alpha : Double) -> Unit

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Context::set_source_surface

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fn Context::set_source_surface(self : Context, surface : Surface, x? : Double, y? : Double) -> Unit

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Context::status

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fn Context::status(self : Context) -> Status

Returns this context's current status.

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Context::stroke

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fn Context::stroke(self : Context) -> Unit

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Context::translate

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fn Context::translate(self : Context, tx : Double, ty : Double) -> Unit

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FontType

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pub(all) enum FontType {
  Toy
  Ft
  Win32
  Quartz
  User
  Dwrite
} derive(Eq, 
Debug)

The backend used by a Cairo font face or scaled font.

#
Format

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pub(all) enum Format {
  Argb32
  Rgb24
  A8
  A1
} derive(Eq, 
Debug)

The pixel layout used by an image surface.

#
Path

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type Path

An independently owned snapshot of Cairo path data.

#
Path::segments

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fn Path::segments(self : Path) -> Array[PathSegment]

Copies the native path data into typed MoonBit segments.

A path with a non-success status produces an empty array; inspect Path::status before consuming its segments when errors are possible.

#
Path::status

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fn Path::status(self : Path) -> Status

Returns the status stored in this path snapshot.

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PathSegment

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pub(all) enum PathSegment {
  PathSegmentMoveTo(Double, Double)
  PathSegmentLineTo(Double, Double)
  PathSegmentCurveTo(Double, Double, Double, Double, Double, Double)
  PathSegmentClosePath
} derive(Eq, 
Debug)

One typed command from a Cairo path snapshot.

#
Rectangle

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pub struct Rectangle {
  x : Double
  y : Double
  width : Double
  height : Double
} derive(Eq, 
Debug)

A floating-point rectangle.

The Cairo API that consumes the rectangle defines its coordinate space.

#
Rectangle::components

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fn Rectangle::components(self : Rectangle) -> (Double, Double, Double, Double)

Returns (x, y, width, height).

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Rectangle::new

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fn Rectangle::new(x : Double, y : Double, width : Double, height : Double) -> Rectangle

Creates a rectangle without restricting its origin or dimensions.

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Status

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A version-tolerant Cairo status code.

Status remains opaque so newer Cairo releases can return status values that were unknown when this binding was compiled.

#
Status::is_success

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fn Status::is_success(self : Status) -> Bool

Returns whether this status represents a successful operation.

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Status::to_int

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fn Status::to_int(self : Status) -> Int

Returns Cairo's numeric representation of this status.

#
Status::to_string

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fn Status::to_string(self : Status) -> String

Returns Cairo's description of this status.

#
Surface

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type Surface

An owned reference to a Cairo surface.

#
Surface::create_image

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fn Surface::create_image(format : Format, width : Int, height : Int) -> Surface

Creates an image surface with the requested pixel format and dimensions.

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Surface::create_recording

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fn Surface::create_recording(content : Content, extents? : Rectangle) -> Surface

Creates a surface that records drawing operations for later replay.

Omitting extents creates an unbounded recording surface. A supplied rectangle limits recording in the surface's device-space coordinates. Transformations later applied to a drawing context, such as scaling or translation, do not transform these bounds. Cairo copies the rectangle during this call.

#
Surface::height

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fn Surface::height(self : Surface) -> Int

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Surface::status

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fn Surface::status(self : Surface) -> Status

Returns this surface's current status.

#
Surface::stride

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fn Surface::stride(self : Surface) -> Int

#
Surface::width

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fn Surface::width(self : Surface) -> Int

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Surface::write_to_png

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fn Surface::write_to_png(self : Surface, path : String) -> Status

Writes this surface to a PNG file and returns Cairo's operation status.

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