typedef struct char magic[4]; // 'V','L','W',0 uint32_t glyphCount; uint16_t defaultGlyph; uint16_t ascent; uint16_t descent; uint16_t leading; uint16_t missingWidth; VLWHeader;
glyphs = [] for ch in chars: face.load_char(ch, freetype.FT_LOAD_RENDER) glyph = face.glyph bitmap = glyph.bitmap glyphs.append( 'codepoint': ord(ch), 'width': glyph.advance.x >> 6, 'height': bitmap.rows, 'x_off': glyph.bitmap_left, 'y_off': glyph.bitmap_top, 'advance': glyph.advance.x >> 6, 'bitmap': bytes(bitmap.buffer) ) ttf to vlw converter
(repeats N times): | Field | Type | Description | |-------|------|-------------| | codepoint | uint32 | Unicode code point | | width | uint16 | Advance width | | height | uint16 | Glyph bitmap height | | x_off | int16 | X offset (bearing) | | y_off | int16 | Y offset (from baseline) | | advance | uint16 | Advance width (redundant, but present) | | bitmap | uint8[width*height] | Pixel data (1-bit or 8-bit alpha) | typedef struct char magic[4]
| Offset | Size (bytes) | Description | |--------|--------------|-------------| | 0 | 4 | Magic header: "VLW" + version (0x00) | | 4 | 4 | Number of glyphs (N) | | 8 | 2 | Default glyph index (often 0 for '.notdef') | | 10 | 2 | Ascent (pixels) | | 12 | 2 | Descent (positive value) | | 14 | 2 | Leading | | 16 | 2 | Missing glyph width | 0 uint32_t glyphCount
Note: Processing VLW typically stores (antialiased) unless saved as "smooth" disabled. 4. Converter Design & Algorithm The converter follows a five-stage pipeline:
