Update generate_font.py to produce 8-bit alpha maps instead of 1-bit
packed bitmaps. This enables text smoothing (anti-aliasing) during
framebuffer rendering by providing pixel intensity values (0-255).
Key changes:
- Switch PIL image mode from "1" (monochrome) to "L" (8-bit grayscale).
- Change C data type from uint32_t bit-packed rows to uint8_t byte arrays.
- Implement vertical centering logic using font metrics (ascent/descent).
- Add glyph clipping detection and warnings for both width and height.
- Format C output so each source line represents one glyph row.
Change-Id: Iec8a0123456789abcdef0123456789abcdef0123
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91178
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Update generate_font.py to support user-defined canvas width and height
via command-line arguments. This replaces the hardcoded 16x24 limits.
Key changes:
- Use argparse for --width and --height parameters.
- Ensure glyphs are left-aligned to the MSB (bit 15 or 31) for
scalability.
TEST=Able to create font table upto 32 pixels wide.
```
python generate_font.py <path_to_ttf> --width 24 --height 32 > font_table.c
```
Change-Id: Ifd02a979abf41a2c2b088ae58bb931f9f6421491
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91165
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This adds generate_font.py, a Python utility designed to convert
standard TTF/OTF files into a compact bitmapped format suitable for
firmware framebuffers.
Key features:
- Generates a left-aligned (normalized) bitmapped table to eliminate
dead space in font glyphs.
- Outputs a character width table to support proportional spacing.
- Exports FONT_HEIGHT and FONT_WIDTH macros for C synchronization.
- Limits output to printable ASCII (32-126) to minimize binary bloat.
The tool uses the Pillow (PIL) library to rasterize glyphs and is
intended to be used during the build process to generate C source
files for splash screen text rendering.
Usage:
python util/font/generate_font.py <font.ttf> > font_table.c
Change-Id: Iec8907f1a5f24d61822230f6a22295c8382d2229
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91122
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
