OverlayRenderer.h File Reference

OverlayRenderer draws editor chrome (currently selection path outlines) directly into the renderer's existing frame buffer using the canvas primitives RendererInterface already exposes. It is not a separate compositing layer and not a fabricated SVG subtree — chrome and document share one render target so there is no subpixel drift between them. More...

#include <optional>
#include <span>
#include "donner/base/Box.h"
#include "donner/base/Transform.h"
#include "donner/svg/SVGElement.h"

Include dependency graph for OverlayRenderer.h:

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Classes
class	donner::editor::OverlayRenderer

Namespaces
namespace	donner
	Top-level Donner namespace, which is split into different sub-namespaces such as donner::svg and donner::css.
namespace	donner::svg
	Donner SVG library, which can load, manipulate and render SVG files.

Detailed Description

OverlayRenderer draws editor chrome (currently selection path outlines) directly into the renderer's existing frame buffer using the canvas primitives RendererInterface already exposes. It is not a separate compositing layer and not a fabricated SVG subtree — chrome and document share one render target so there is no subpixel drift between them.

See docs/design_docs/editor.md "OverlayRenderer uses direct canvas- style Renderer calls" for the architectural rationale and the primitive policy.

Usage:

renderer.draw(editor.document().document());
donner::editor::OverlayRenderer::drawChrome(renderer, editor);
const auto bitmap = renderer.takeSnapshot();  // contains chrome

Must be called after Renderer::draw(document) (which has its own internal beginFrame / endFrame cycle) and before Renderer::takeSnapshot(). The renderer's frame pixmap survives across endFrame so additional canvas commands compose onto it directly.