Struct qt_gui::q_opengl_window::UpdateBehavior

pub struct UpdateBehavior(/* private fields */);

This enum describes the update strategy of the QOpenGLWindow.

C++ enum: QOpenGLWindow::UpdateBehavior.

C++ documentation:

This enum describes the update strategy of the QOpenGLWindow.

Implementations

impl UpdateBehavior

pub fn to_int(&self) -> c_int

impl UpdateBehavior

pub const NoPartialUpdate: UpdateBehavior = _

Indicates that the entire window surface will redrawn on each update and so no additional framebuffers are needed. This is the setting used in most cases and is equivalent to how drawing directly via QWindow would function. (C++ enum variant: NoPartialUpdate = 0)

pub const PartialUpdateBlit: UpdateBehavior = _

Indicates that the drawing performed in paintGL() does not cover the entire window. In this case an extra framebuffer object is created under the hood, and rendering performed in paintGL() will target this framebuffer. This framebuffer is then blitted onto the window surface’s default framebuffer after each paint. This allows having QPainter-based drawing code in paintGL() which only repaints a smaller area at a time, because, unlike NoPartialUpdate, the previous content is preserved. (C++ enum variant: PartialUpdateBlit = 1)

pub const PartialUpdateBlend: UpdateBehavior = _

Similar to PartialUpdateBlit, but instead of using framebuffer blits, the contents of the extra framebuffer is rendered by drawing a textured quad with blending enabled. This, unlike PartialUpdateBlit, allows alpha blended content and works even when the glBlitFramebuffer is not available. Performance-wise this setting is likely to be somewhat slower than PartialUpdateBlit. (C++ enum variant: PartialUpdateBlend = 2)

Trait Implementations

impl Clone for UpdateBehavior

fn clone(&self) -> UpdateBehavior

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UpdateBehavior

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<UpdateBehavior> for c_int

fn from(value: UpdateBehavior) -> Self

Converts to this type from the input type.

impl From<i32> for UpdateBehavior

fn from(value: c_int) -> Self

Converts to this type from the input type.

impl PartialEq for UpdateBehavior

fn eq(&self, other: &UpdateBehavior) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for UpdateBehavior

impl Eq for UpdateBehavior

impl StructuralEq for UpdateBehavior

impl StructuralPartialEq for UpdateBehavior