diff options
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 80 |
1 files changed, 65 insertions, 15 deletions
@@ -1,38 +1,88 @@ +2021-07-15 Ben Wagner <bungeman@chromium.org> + + * src/smooth/ftgrays.c: Guard inclusion of `emmintrin.h`. + + Guard inclusion of `emmintrin.h` with `#ifdef __SSE2__`. The gcc + version of this header, `xmmintrin.h`, and `mmintrin.h` check that + the appropriate defines are set before defining anything (are + internally guarded). However, the clang versions of these includes + are not internally guarded. As a result of this, externally guard + the inclusion of these headers. + 2021-07-15 David Turner <david@freetype.org> - [smooth] Implement Bezier quadratic arc flattenning with DDA + [smooth] Implement Bézier quadratic arc flattening with DDA. Benchmarking shows that this provides a very slighty performance - boost when rendering fonts with lots of quadratic bezier arcs, + boost when rendering fonts with lots of quadratic Bézier arcs, compared to the recursive arc splitting, but only when SSE2 is available, or on 64-bit CPUs. + On a 2017 Core i5-7300U CPU on Linux/x86_64: + + ftbench -p -s10 -t5 -cb DroidSansFallbackFull.ttf + + Before: 4.033 us/op (best of 5 runs for all numbers) + After: 3.876 us/op + + ftbench -p -s60 -t5 -cb DroidSansFallbackFull.ttf + + Before: 13.467 us/op + After: 13.385 us/op + * src/smooth/ftgrays.c (gray_render_conic): New implementation based on DDA and optionally SSE2. 2021-07-15 David Turner <david@freetype.org> - [smooth] Minor speedup to smooth rasterizer + [smooth] Minor speedup to smooth rasterizer. - This speeds up the smooth rasterizer by avoiding a conditional + This speeds up the smooth rasterizer by avoiding conditional branches in the hot path. - * src/smooth/ftgrays.c: Define a null cell used to both as a - sentinel for all linked-lists, and to accumulate coverage and - area values for "out-of-bounds" cell positions without a - conditional check. + - Define a fixed 'null cell', which will be pointed to whenever the + current cell is outside of the current target region. This avoids + a `ras.cell != NULL` check in the `FT_INTEGRATE` macro. + + - Also use the null cell as a sentinel at the end of all `ycells` + linked-lists, by setting its x coordinate to `INT_MAX`. This + avoids a `if (!cell)` check in `gray_set_cell` as well. + + - Slightly change the worker struct fields to perform a little less + operations during rendering. + + Example results (on a 2013 Corei5-3337U CPU) + + out/ftbench -p -s10 -t5 -bc DroidSansFallbackFull.ttf + + Before: 5.472 us/op + After: 5.275 us/op + + out/ftbench -p -s60 -t5 -bc DroidSansFallbackFull.ttf + + Before: 17.988 us/op + After: 17.389 us/op + + * src/smooth/ftgrays.c (grat_TWorker): Replace `num_cells` field with + `cell_free` and `cell_limit`. + (NULL_CELL_PTR, CELL_MAX_X_VALUE, CELL_IS_NULL): New macros. + (gray_dump_cells, gray_set_cell, gray_sweep, gray_sweep_direct, + gray_convert_glyph_inner, gray_convert_glyph): Updated. 2021-07-15 David Turner <david@freetype.org> - Replaces download-test-fonts.sh with download-test-fonts.py which - does the same work, and also avoids downloading anything if the - files are already installed with the right content. + [tests] Rewrite download script in Python3. + + This commit replaces the bash script with a Python script that does + the same work, plus avoiding to download anything if the files are + already installed with the right content. - Now uses the first 8 byte of each file's sha256 hash for the digest. + We now use the first 8 bytes of each file's sha256 hash for the + digest. - * tests/scripts/download-test-fonts.sh: Removed - * tests/scripts/download-test-fonts.py: New script - * tests/README.md: Updated + * tests/scripts/download-test-fonts.sh: Removed. + * tests/scripts/download-test-fonts.py: New script. + * tests/README.md: Updated. 2021-07-15 Alex Richardson <Alexander.Richardson@cl.cam.ac.uk> |