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51 lines
2.1 KiB
Markdown
51 lines
2.1 KiB
Markdown
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This is an overview of the major events in the history of our Layers infrastructure.
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- iPhone released in July 2007 (Built on a toolkit called LayerKit)
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- Core Animation (October 2007) LayerKit was publicly renamed to OS X 10.5
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- Webkit CSS 3d transforms (July 2009)
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- Original layers API (March 2010) Introduced the idea of a layer manager that
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would composite. One of the first use cases for this was hardware accelerated
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YUV conversion for video.
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- Retained layers (July 7 2010 - Bug 564991)
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This was an important concept that introduced the idea of persisting the layer
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content across paints in gecko controlled buffers instead of just by the OS. This introduced
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the concept of buffer rotation to deal with scrolling instead of using the
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native scrolling APIs like ScrollWindowEx
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- Layers IPC (July 2010 - Bug 570294)
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This introduced shadow layers and edit lists and was originally done for e10s v1
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- 3d transforms (September 2011 - Bug 505115)
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- OMTC (December 2012 - Bug 711168)
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This was prototyped on OS X but shipped first for Fennec
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- Tiling v1 (April 2012 - Bug 739679)
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Originally done for Fennec.
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This was done to avoid situations where we had to do a bunch of work for
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scrolling a small amount. i.e. buffer rotation. It allowed us to have a
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variety of interesting features like progressive painting and lower resolution
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painting.
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- C++ Async pan zoom controller (July 2012 - Bug 750974)
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The existing APZ code was in Java for Fennec so this was reimplemented.
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- Compositor API (April 2013 - Bug 825928)
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Layers refactoring created a compositor API that abstracted away the differences between the
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D3D vs OpenGL. The main piece of API is DrawQuad.
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- Tiling v2 (Mar 7 2014 - Bug 963073)
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Tiling for B2G. This work is mainly porting tiled layers to new textures,
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implementing double-buffered tiles and implementing a texture client pool, to
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be used by tiled content clients.
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A large motivation for the pool was the very slow performance of allocating tiles because
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of the sync messages to the compositor.
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The slow performance of allocating was directly addressed by bug 959089 which allowed us
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to allocate gralloc buffers without sync messages to the compositor thread.
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