Trait gdk4::prelude::GdkCairoContextExt

pub trait GdkCairoContextExt: Sealed {
    // Provided methods
    unsafe fn draw_from_gl(
        &self,
        surface: &Surface,
        source: i32,
        source_type: i32,
        buffer_scale: i32,
        x: i32,
        y: i32,
        width: i32,
        height: i32
    ) { ... }
    fn set_source_color(&self, rgba: &RGBA) { ... }
    fn set_source_pixbuf(&self, pixbuf: &Pixbuf, x: f64, y: f64) { ... }
    fn add_rectangle(&self, rectangle: &Rectangle) { ... }
    fn add_region(&self, region: &Region) { ... }
}

Trait containing integration methods with cairo::Context.

Provided Methods

unsafe fn draw_from_gl( &self, surface: &Surface, source: i32, source_type: i32, buffer_scale: i32, x: i32, y: i32, width: i32, height: i32 )

Safety

It’s the responsibility of the caller to ensure that source is a valid GL resource. The main way to not draw GL content in GTK.

It takes a render buffer ID (@source_type == GL_RENDERBUFFER) or a texture id (@source_type == GL_TEXTURE) and draws it onto @cr with an OVER operation, respecting the current clip. The top left corner of the rectangle specified by @x, @y, @width and @height will be drawn at the current (0,0) position of the cairo::Context.

This will work for all cairo::Context, as long as @surface is realized, but the fallback implementation that reads back the pixels from the buffer may be used in the general case. In the case of direct drawing to a surface with no special effects applied to @cr it will however use a more efficient approach.

For GL_RENDERBUFFER the code will always fall back to software for buffers with alpha components, so make sure you use GL_TEXTURE if using alpha.

Calling this may change the current GL context.

Deprecated since 4.6

The function is overly complex and produces broken output in various combinations of arguments. If you want to draw with GL textures in GTK, use GLTexture::new(); if you want to use that texture in Cairo, use TextureExtManual::download() to download the data into a Cairo image surface.

cr

a cairo context

surface

The surface we’re rendering for (not necessarily into)

source

The GL ID of the source buffer

source_type

The type of the @source

buffer_scale

The scale-factor that the @source buffer is allocated for

x

The source x position in @source to start copying from in GL coordinates

y

The source y position in @source to start copying from in GL coordinates

width

The width of the region to draw

height

The height of the region to draw

fn set_source_color(&self, rgba: &RGBA)

fn set_source_pixbuf(&self, pixbuf: &Pixbuf, x: f64, y: f64)

Sets the given pixbuf as the source pattern for @cr.

The pattern has an extend mode of CAIRO_EXTEND_NONE and is aligned so that the origin of @pixbuf is @pixbuf_x, @pixbuf_y.

cr

a cairo context

pixbuf

a gdk_pixbuf::Pixbuf

pixbuf_x

X coordinate of location to place upper left corner of @pixbuf

pixbuf_y

Y coordinate of location to place upper left corner of @pixbuf

fn add_rectangle(&self, rectangle: &Rectangle)

Adds the given rectangle to the current path of @cr.

cr

a cairo context

rectangle

a Rectangle

fn add_region(&self, region: &Region)

Adds the given region to the current path of @cr.

cr

a cairo context

region

a cairo::Region

Implementations on Foreign Types

impl GdkCairoContextExt for Context

Implementors