feat: Overhaul font format into CrossPoint font

lib/CrossPointFont/CrossPointFontFormat.h

@@ -0,0 +1,57 @@
+#pragma once
+
+// 16-bit marker at the start of a CrossPoint font file
+// (CrossPoint Font Format)
+#define CPF_FONT_MARKER 0xCFF1
+#define CPF_FONT_MARKER_SMALL 0xCFF2
+
+// Font info per large character (glyph)
+typedef struct {
+  uint32_t bitmapOffset;  /// Offset to compressed bitmap data for this glyph
+  uint16_t width;         /// bitmap width in pixels
+  uint16_t height;        /// bitmap height in pixels
+  uint16_t xAdvance;      /// total width in pixels (bitmap + padding)
+  int16_t xOffset;        /// left padding to upper left corner
+  int16_t yOffset;        /// top padding to upper left corner
+} CrossPointFontGlyph;
+
+// Font info per small character (glyph)
+typedef struct {
+  uint32_t bitmapOffset;  /// Offset to compressed bitmap data for this glyph
+  uint8_t width;          /// bitmap width in pixels
+  uint8_t height;         /// bitmap height in pixels
+  uint8_t xAdvance;       /// total width in pixels (bitmap + padding)
+  int8_t xOffset;         /// left padding to upper left corner
+  int16_t yOffset;        /// top padding to upper left corner
+} CrossPointFontSmallGlyph;
+
+/// Glyph interval structure
+typedef struct {
+  uint32_t first;   /// The first unicode code point of the interval
+  uint32_t last;    /// The last unicode code point of the interval
+  uint32_t offset;  /// Index of the first code point into the glyph array
+} CrossPointFontUnicodeInterval;
+
+typedef struct {
+  uint16_t u16Marker;      /// CPF_FONT_MARKER / CPF_FONT_MARKER_SMALL
+  uint16_t height;         /// Newline distance (y axis)
+  uint16_t ascender;       /// Maximal height of a glyph above the base line
+  uint8_t styles;          /// Regular = 0x01, Bold = 0x02, Italic = 0x04, BoldItalic = 0x08, can be OR'd together
+  uint16_t intervalCount;  /// Number of unicode intervals.
+  uint32_t glyphCount;     /// Number of total glyphs across all styles
+} CrossPointFontHeader;
+
+/// Data stored for FONT AS A WHOLE
+typedef struct {
+  CrossPointFontHeader header;
+  CrossPointFontUnicodeInterval* intervals;  /// Valid unicode intervals for this font
+  CrossPointFontGlyph* glyphs;               /// Glyph array
+  uint8_t* bitmap;                           /// Glyph bitmaps, concatenated
+} CrossPointFontData;
+
+typedef struct {
+  CrossPointFontHeader header;
+  CrossPointFontUnicodeInterval* intervals;  /// Valid unicode intervals for this font
+  CrossPointFontSmallGlyph* glyphs;          /// Glyph array
+  uint8_t* bitmap;                           /// Glyph bitmaps, concatenated
+} CrossPointFontDataSmall;