mirror of https://github.com/alfishe/amiga-bootcamp.git synced 2026-06-13 00:26:28 +00:00

Ilia Sharin 21751c0025 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections

Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.

2026-04-23 12:17:35 -04:00

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← Home · Graphics

Text and Fonts — TextFont, TextAttr, OpenFont, Text

Overview

AmigaOS uses bitmap fonts rendered through graphics.library. Fonts are described by TextAttr (request) and TextFont (loaded instance). Disk fonts require diskfont.library.

Key Structures

/* graphics/text.h — NDK39 */
struct TextAttr {
    STRPTR  ta_Name;    /* font name, e.g. "topaz.font" */
    UWORD   ta_YSize;   /* desired height in pixels */
    UBYTE   ta_Style;   /* FSF_BOLD, FSF_ITALIC, FSF_UNDERLINED */
    UBYTE   ta_Flags;   /* FPF_ROMFONT, FPF_DISKFONT, etc. */
};

struct TextFont {
    struct Message tf_Message;
    UWORD   tf_YSize;      /* font height */
    UBYTE   tf_Style;
    UBYTE   tf_Flags;
    UWORD   tf_XSize;      /* nominal width */
    UWORD   tf_Baseline;   /* baseline from top */
    UWORD   tf_BoldSmear;  /* bold smear width */
    UWORD   tf_Accessors;  /* open count */
    UBYTE   tf_LoChar;     /* first character code */
    UBYTE   tf_HiChar;     /* last character code */
    APTR    tf_CharData;   /* bitmap data */
    UWORD   tf_Modulo;     /* bytes per row of font bitmap */
    APTR    tf_CharLoc;    /* character location table */
    APTR    tf_CharSpace;  /* proportional spacing table */
    APTR    tf_CharKern;   /* kerning table */
};

Opening Fonts

/* ROM font (topaz, always available): */
struct TextAttr ta = {"topaz.font", 8, 0, FPF_ROMFONT};
struct TextFont *font = OpenFont(&ta);

/* Disk font (requires diskfont.library): */
struct TextAttr ta2 = {"helvetica.font", 24, 0, FPF_DISKFONT};
struct TextFont *font2 = OpenDiskFont(&ta2);

/* Set in RastPort: */
SetFont(rp, font);

Rendering Text

Move(rp, 10, 20);             /* position cursor */
Text(rp, "Hello Amiga", 11);  /* render 11 characters */

/* Get pixel width of a string: */
UWORD width = TextLength(rp, "Hello", 5);

Style Flags

#define FSF_UNDERLINED  0x01
#define FSF_BOLD        0x02
#define FSF_ITALIC      0x04
#define FSF_EXTENDED    0x08

/* Set algorithmic style: */
SetSoftStyle(rp, FSF_BOLD | FSF_ITALIC,
             AskSoftStyle(rp));  /* ask which styles the font supports */

References

NDK39: graphics/text.h
ADCD 2.1: OpenFont, OpenDiskFont, SetFont, Text, TextLength

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