Scott Duensing
946719052f
Add text rendering support via the Windows 3.x ExtTextOut DDI function. Builds a .FNT v3 font structure from the VGA BIOS 8x16 ROM font (INT 10h AH=11h), with v3 char table (6-byte entries, absolute offsets) required by VBESVGA.DRV's BigFontFlags in protected mode. Provides a full-screen clip rect since STRBLT.ASM unconditionally dereferences lpClipRect. Tested with both VBESVGA.DRV and S3TRIO.DRV. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
334 lines
14 KiB
C
334 lines
14 KiB
C
#ifndef WINDDI_H
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#define WINDDI_H
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// ============================================================================
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// winddi.h - Windows 3.x Display Driver Interface (DDI) structures
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//
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// These packed structures match the binary layout expected by 16-bit
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// Windows display drivers. They are used to communicate between the
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// 32-bit host program and the 16-bit driver code via shared memory
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// in DGROUP.
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//
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// Key structures:
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// GdiInfo16T - Device capabilities, filled by Enable(style=1)
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// PDevice16T - Physical device descriptor, filled by Enable(style=0)
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// DrawMode16T - Drawing parameters (ROP2, colors, text spacing)
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// LogBrush16T - Logical brush input to RealizeObject
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// LogPen16T - Logical pen input to RealizeObject
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// DibPDevice16T - DIB engine PDEVICE extension (for software drivers)
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//
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// All structures use __attribute__((packed)) to match Win16 layout.
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// ============================================================================
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#include "wintypes.h"
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// ============================================================================
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// GDIINFO - Device capabilities structure filled by Enable(style=1)
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// This is the 16-bit Windows 3.1 DDK GDIINFO structure (0x6C bytes).
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// ============================================================================
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typedef struct __attribute__((packed)) {
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int16_t dpVersion; // 0x00: driver version (0x030A for 3.10)
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int16_t dpTechnology; // 0x02: device technology
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int16_t dpHorzSize; // 0x04: horizontal size in mm
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int16_t dpVertSize; // 0x06: vertical size in mm
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int16_t dpHorzRes; // 0x08: horizontal resolution (pixels)
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int16_t dpVertRes; // 0x0A: vertical resolution (pixels)
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int16_t dpBitsPixel; // 0x0C: bits per pixel
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int16_t dpPlanes; // 0x0E: number of bit planes
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int16_t dpNumBrushes; // 0x10: number of device brushes
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int16_t dpNumPens; // 0x12: number of device pens
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int16_t dpNumFonts; // 0x14: number of device fonts
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int16_t dpNumColors; // 0x16: number of colors in color table
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int16_t dpDEVICEsize; // 0x18: size of PDEVICE structure
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uint16_t dpCurves; // 0x1A: curve capabilities
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uint16_t dpLines; // 0x1C: line capabilities
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uint16_t dpPolygonals; // 0x1E: polygon capabilities
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uint16_t dpText; // 0x20: text capabilities
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uint16_t dpClip; // 0x22: clipping capabilities
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uint16_t dpRaster; // 0x24: raster capabilities
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int16_t dpAspectX; // 0x26: x aspect ratio
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int16_t dpAspectY; // 0x28: y aspect ratio
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int16_t dpAspectXY; // 0x2A: diagonal aspect ratio
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int16_t dpStyleLen; // 0x2C: length of styled line segment
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Point16T dpMLoWin; // 0x2E: metric lo-res window
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Point16T dpMLoVpt; // 0x32: metric lo-res viewport
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Point16T dpMHiWin; // 0x36: metric hi-res window
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Point16T dpMHiVpt; // 0x3A: metric hi-res viewport
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Point16T dpELoWin; // 0x3E: english lo-res window
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Point16T dpELoVpt; // 0x42: english lo-res viewport
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Point16T dpEHiWin; // 0x46: english hi-res window
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Point16T dpEHiVpt; // 0x4A: english hi-res viewport
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Point16T dpTwpWin; // 0x4E: twips window
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Point16T dpTwpVpt; // 0x52: twips viewport
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int16_t dpLogPixelsX; // 0x56: logical pixels per inch X
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int16_t dpLogPixelsY; // 0x58: logical pixels per inch Y
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int16_t dpDCManage; // 0x5A: DC management flags
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uint16_t reserved1[5]; // 0x5C: reserved
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uint16_t dpPalColors; // 0x66: number of palette colors
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uint16_t dpPalReserved; // 0x68: number of reserved palette entries
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uint16_t dpPalResolution; // 0x6A: palette DAC resolution (bits per gun)
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} GdiInfo16T;
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// dpTechnology values
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#define DT_PLOTTER 0
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#define DT_RASDISPLAY 1
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#define DT_RASPRINTER 2
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#define DT_RASCAMERA 3
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#define DT_CHARSTREAM 4
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#define DT_METAFILE 5
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#define DT_DISPFILE 6
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// dpRaster capability bits
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#define RC_BITBLT 0x0001
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#define RC_BANDING 0x0002
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#define RC_SCALING 0x0004
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#define RC_BITMAP64 0x0008
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#define RC_GDI20_OUTPUT 0x0010
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#define RC_DI_BITMAP 0x0080
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#define RC_PALETTE 0x0100
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#define RC_DIBTODEV 0x0200
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#define RC_BIGFONT 0x0400
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#define RC_STRETCHBLT 0x0800
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#define RC_FLOODFILL 0x1000
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#define RC_STRETCHDIB 0x2000
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// ============================================================================
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// PDEVICE - Physical device descriptor
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// The first word indicates the type. The rest is driver-specific.
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// We allocate a generous buffer for the driver to fill in.
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// ============================================================================
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#define PDEVICE_MAX_SIZE 4096
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typedef struct __attribute__((packed)) {
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int16_t pdType; // 0 = memory bitmap, nonzero = physical device
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uint8_t pdData[PDEVICE_MAX_SIZE - 2]; // driver-specific data
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} PDevice16T;
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// ============================================================================
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// DRAWMODE - Drawing mode structure (passed to BitBlt, Output, etc.)
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// ============================================================================
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typedef struct __attribute__((packed)) {
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int16_t rop2; // 0x00: raster operation (R2_*)
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int16_t bkMode; // 0x02: background mode (TRANSPARENT=1, OPAQUE=2)
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uint32_t bkColor; // 0x04: background color (physical)
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uint32_t textColor; // 0x08: text color (physical)
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int16_t tBreakExtra; // 0x0C: total break extra
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int16_t breakExtra; // 0x0E: break extra per char
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int16_t breakErr; // 0x10: accumulated break error
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int16_t breakRem; // 0x12: break remainder
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int16_t breakCount; // 0x14: break count
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int16_t charExtra; // 0x16: extra pixels per char
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uint32_t lbkColor; // 0x18: logical background color
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uint32_t ltextColor; // 0x1C: logical text color
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uint16_t icrBk; // 0x20: index to background color
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uint16_t icrText; // 0x22: index to text color
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} DrawMode16T;
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// Background mode constants
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#define BM_TRANSPARENT 1
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#define BM_OPAQUE 2
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// ============================================================================
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// Logical brush (for RealizeObject)
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// ============================================================================
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typedef struct __attribute__((packed)) {
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uint16_t lbStyle; // Brush style
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uint32_t lbColor; // Brush color (COLORREF)
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int16_t lbHatch; // Hatch pattern
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uint32_t lbBkColor; // Background color (Win 3.1)
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} LogBrush16T;
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// Brush styles
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#define BS_SOLID 0
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#define BS_HOLLOW 1
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#define BS_NULL 1
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#define BS_HATCHED 2
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#define BS_PATTERN 3
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#define BS_DIBPATTERN 5
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// Hatch styles
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#define HS_HORIZONTAL 0
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#define HS_VERTICAL 1
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#define HS_FDIAGONAL 2
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#define HS_BDIAGONAL 3
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#define HS_CROSS 4
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#define HS_DIAGCROSS 5
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// ============================================================================
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// Logical pen (for RealizeObject)
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// ============================================================================
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typedef struct __attribute__((packed)) {
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uint16_t lopnStyle; // Pen style
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Point16T lopnWidth; // Pen width
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uint32_t lopnColor; // Pen color (COLORREF)
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} LogPen16T;
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// Pen styles
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#define PS_SOLID 0
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#define PS_DASH 1
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#define PS_DOT 2
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#define PS_DASHDOT 3
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#define PS_DASHDOTDOT 4
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#define PS_NULL 5
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#define PS_INSIDEFRAME 6
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// ============================================================================
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// CURSORINFO - Cursor shape description
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// ============================================================================
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typedef struct __attribute__((packed)) {
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int16_t csHotX; // Hotspot X
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int16_t csHotY; // Hotspot Y
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int16_t csWidth; // Cursor width
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int16_t csHeight; // Cursor height
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int16_t csWidthB; // Width in bytes
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int16_t csColor; // Planes * bitsPixel
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} CursorInfo16T;
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// ============================================================================
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// Enable() style parameter values
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// ============================================================================
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#define ENABLE_INQUIRE 0 // First call: fill GDIINFO
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#define ENABLE_ENABLE 1 // Second call: initialize PDEVICE
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// ============================================================================
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// Output() style values
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// ============================================================================
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#define OS_ARC 3
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#define OS_SCANLINES 4
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#define OS_RECTANGLE 6
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#define OS_ELLIPSE 7
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#define OS_MARKER 8
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#define OS_POLYLINE 18
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#define OS_ALTPOLYGON 22
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#define OS_WINDPOLYGON 20
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#define OS_PIE 23
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#define OS_POLYMARKER 24
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#define OS_CHORD 39
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#define OS_CIRCLE 55
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#define OS_ROUNDRECT 72
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// ============================================================================
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// Control() function codes
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// ============================================================================
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#define CTRL_GETSCALINGFACTOR 14
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#define CTRL_RESETDEVICE 128
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#define CTRL_MOUSETRAILS 39
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// ============================================================================
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// RealizeObject() styles
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// ============================================================================
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#define OBJ_PEN 1
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#define OBJ_BRUSH 2
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#define OBJ_FONT 3
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// ============================================================================
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// Physical brush/pen structures (driver-specific, maximum size)
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// ============================================================================
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#define PHYS_OBJ_MAX_SIZE 128
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typedef struct __attribute__((packed)) {
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uint8_t data[PHYS_OBJ_MAX_SIZE];
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} PhysObj16T;
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// ============================================================================
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// DIBENGINE structures (for drivers that use the DIB engine)
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// ============================================================================
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// DIB_BitmapInfo passed to DIB engine functions
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typedef struct __attribute__((packed)) {
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int16_t bmType;
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int16_t bmWidth;
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int16_t bmHeight;
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int16_t bmWidthBytes;
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uint8_t bmPlanes;
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uint8_t bmBitsPixel;
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uint32_t bmBits; // Far pointer to bits (as DWORD)
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uint32_t bmWidthPlanes;
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uint32_t bmBitsLong; // Selector:0 far pointer
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uint16_t bmSegmentIndex;
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uint16_t bmScanSegment;
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uint16_t bmFillBytes;
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uint16_t reserved1;
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uint16_t reserved2;
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} DibBitmapInfo16T;
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// DIB engine PDEVICE extension (placed at start of PDEVICE by DIB-based drivers)
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typedef struct __attribute__((packed)) {
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int16_t deType; // Device type
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uint16_t deWidth; // Width in pixels
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uint16_t deHeight; // Height in pixels
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uint16_t deWidthBytes; // Bytes per scan line
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uint8_t dePlanes; // Number of planes
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uint8_t deBitsPixel; // Bits per pixel
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uint32_t delpPDevice; // Pointer to next PDEVICE
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uint32_t dlpColorTable; // Pointer to color table
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// ... additional fields follow
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} DibPDevice16T;
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// ============================================================================
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// .FNT v2 file header (117 bytes)
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//
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// Display drivers expect the full .FNT format with fsVersion at offset 0.
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// lp_font passed to ExtTextOut points to fsType at offset 0x42.
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// ============================================================================
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typedef struct __attribute__((packed)) {
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uint16_t fsVersion; // 0x00: 0x0200
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uint32_t fsSize; // 0x02: total structure size
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char fsCopyright[60]; // 0x06: copyright string
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uint16_t fsType; // 0x42: 0 = raster
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uint16_t fsPoints; // 0x44: point size
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uint16_t fsVertRes; // 0x46: vertical resolution
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uint16_t fsHorizRes; // 0x48: horizontal resolution
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uint16_t fsAscent; // 0x4A: baseline from top
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uint16_t fsInternalLeading; // 0x4C
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uint16_t fsExternalLeading; // 0x4E
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uint8_t fsItalic; // 0x50
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uint8_t fsUnderline; // 0x51
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uint8_t fsStrikeOut; // 0x52
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uint16_t fsWeight; // 0x53: 400 = normal
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uint8_t fsCharSet; // 0x55: 255 = OEM
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uint16_t fsPixWidth; // 0x56: 0=proportional, else fixed
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uint16_t fsPixHeight; // 0x58: character cell height
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uint8_t fsPitchAndFamily; // 0x5A
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uint16_t fsAvgWidth; // 0x5B
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uint16_t fsMaxWidth; // 0x5D
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uint8_t fsFirstChar; // 0x5F
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uint8_t fsLastChar; // 0x60
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uint8_t fsDefaultChar; // 0x61: relative to fsFirstChar
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uint8_t fsBreakChar; // 0x62: relative to fsFirstChar
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uint16_t fsWidthBytes; // 0x63: bytes per bitmap row
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uint32_t fsDevice; // 0x65: offset to device name
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uint32_t fsFace; // 0x69: offset to face name
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uint32_t fsBitsPointer; // 0x6D: far ptr to bitmap data
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uint32_t fsBitsOffset; // 0x71: offset to bitmap data
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} FntHeader16T; // 0x75 = 117 bytes
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// v2 character table entry (at offset 0x76 after header + pad byte)
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typedef struct __attribute__((packed)) {
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uint16_t width; // character width in pixels
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uint16_t offset; // byte offset from bitmap start
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} FntCharEntry16T; // 4 bytes
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// v3 character table entry (at offset 0x94 after v3 extension fields)
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typedef struct __attribute__((packed)) {
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uint16_t width; // character width in pixels
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uint32_t offset; // absolute byte offset from segment base
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} FntCharEntry30T; // 6 bytes
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// ExtTextOut option flags
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#define ETO_OPAQUE 0x0002
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#define ETO_CLIPPED 0x0004
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#endif // WINDDI_H
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