A single bitmap cache unit the compositor exposes for GPU upload — either a static segment (non-promoted content between promoted layers) or a promoted layer's own rasterization. More...

#include "donner/svg/compositor/CompositorController.h"

Collaboration diagram for donner::svg::compositor::CompositorTile:

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Public Attributes
uint64_t	tileId = 0
	Stable id for this tile's slot in the compositor's cache topology. Segments are (0..N), layers are (1'<<31) \| entityId so the two namespaces don't collide. Editor uses the tileId as the key in its GL texture cache — so as long as the compositor reuses the same tileId for a preserved bitmap, the editor keeps its texture.
uint64_t	generation = 0
	Monotonic version counter, bumped every time this tile's pixel content is re-rasterized. Editor uploads to GL only when the generation differs from the one it last uploaded for this tileId. On the first click-to-drag after page load, at most 3 tile generations advance — the split segment's two halves and the new drag-target layer — because every other segment / filter layer keeps its identity across the layer-set change.
uint32_t	paintOrderIndex = 0
	Position in paint order among the full compositor output. Editor composites tiles by blitting in ascending paintOrderIndex.
const RendererBitmap *	bitmap = nullptr
	Pointer into the compositor's cached bitmap. Empty if the tile's slot is structurally present but no pixel content yet (e.g., a segment whose range contains no visible non-promoted entities).
Entity	layerEntity = entt::null
	Non-null for a promoted layer tile: the promoted entity id. Null for a static segment tile.
Transform2d	canvasFromBitmap
	canvasFromBitmap transform the tile should be drawn with: maps the bitmap's local pixel grid into canvas pixels. Identity for segments and for non-drag layers; pure translation for the drag layer when the fast path has updated its offset.

Detailed Description

A single bitmap cache unit the compositor exposes for GPU upload — either a static segment (non-promoted content between promoted layers) or a promoted layer's own rasterization.

The caller (editor) holds a texture per tile keyed on tileId, and only re-uploads to the GPU when generation advances. The compositor composites these in paint-order (paintOrderIndex) on the editor side.

Member Data Documentation

◆ bitmap

const RendererBitmap* donner::svg::compositor::CompositorTile::bitmap = nullptr

Pointer into the compositor's cached bitmap. Empty if the tile's slot is structurally present but no pixel content yet (e.g., a segment whose range contains no visible non-promoted entities).

◆ canvasFromBitmap

Transform2d donner::svg::compositor::CompositorTile::canvasFromBitmap

canvasFromBitmap transform the tile should be drawn with: maps the bitmap's local pixel grid into canvas pixels. Identity for segments and for non-drag layers; pure translation for the drag layer when the fast path has updated its offset.

◆ generation

uint64_t donner::svg::compositor::CompositorTile::generation = 0

Monotonic version counter, bumped every time this tile's pixel content is re-rasterized. Editor uploads to GL only when the generation differs from the one it last uploaded for this tileId. On the first click-to-drag after page load, at most 3 tile generations advance — the split segment's two halves and the new drag-target layer — because every other segment / filter layer keeps its identity across the layer-set change.

◆ layerEntity

Entity donner::svg::compositor::CompositorTile::layerEntity = entt::null

Non-null for a promoted layer tile: the promoted entity id. Null for a static segment tile.

◆ paintOrderIndex

uint32_t donner::svg::compositor::CompositorTile::paintOrderIndex = 0

Position in paint order among the full compositor output. Editor composites tiles by blitting in ascending paintOrderIndex.

◆ tileId

uint64_t donner::svg::compositor::CompositorTile::tileId = 0

Stable id for this tile's slot in the compositor's cache topology. Segments are (0..N), layers are (1'<<31) | entityId so the two namespaces don't collide. Editor uses the tileId as the key in its GL texture cache — so as long as the compositor reuses the same tileId for a preserved bitmap, the editor keeps its texture.

The documentation for this struct was generated from the following file:

donner/svg/compositor/CompositorController.h

Public Attributes