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Work

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A working prototype of basic feature-set with Java 2D Metal rendering pipeline has been implemented for - 

1. 2D Primitives rendering
   1. implemented AA rendering for some primitives and painting types
   2. optimised geometry handling (no unnecessary MTLBuffer creation)
   3. improved stability: fixed some severe memory management problems in primitive handling
2. Image rendering. 
   1. improved stability: fixed several memory management problems
   2. native blit operations (Blit, IsoBlit) for almost all blit primitives (of MTLBlitLoops)
   3. all 32bpp raster formats with ‘opaque’ flags
   4. all alpha-composite modes (still unsupported extra-alpha)
   5. clipping, transform
   6. textures pool (to avoid reallocations for temporary textures) with restricted size (cleaned with LRU-strategy)
      
      1. fast search in pool
      2. no unnecessary sync
      3. blit without sampling if possible
3. Grayscale Text Rendering

It is available in the lanai repo https://hg.openjdk.java.net/lanai/lanai/

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in Progress :

• JEP code review has been completed : Refer https://github.com/openjdk/jdk/pull/2403. The JEP has been INTEGRATED into JDK mainline on 15 March 2021.
• Work on Project Lanai is complete and no new work will happen in lanai-dev community.
  
• Further bug fixing will now be done in 2d-dev/awt-dev communities.

Work in Progress :

Current focus area is - Rendering performance evaluation :
As basic blocks of rendering have been implemented, it is a good time to check on rendering performance to evaluate how Metal rendering in Java 2D fares as compared to OpenGL rendering in Java 2D. As a first step, we are using below test benchmarkings - 

1. RenderPerfTest (available at - src/demo/share/java2d/RenderPerfTest)
   1. implemented AA benchmarks
2. J2DBench Tests (available at - src/demo/share/java2d/J2DBench) for drawing 2D primitives - line, rectangle, filled rectangle, ellipse, filled ellipse.

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