Source code of Windows XP (NT5)
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/******************************Module*Header*******************************\
* Module Name: lines.h** Line drawing constants and structures.** Copyright (c) 1992-1996 Microsoft Corporation* Copyright (c) 1993-1996 Matrox Electronic Systems, Ltd.\**************************************************************************/
typedef struct _PDEV PDEV; // Handy forward declaration
typedef LONG STYLEPOS;
#define STYLE_MAX_COUNT 16
#define STYLE_MAX_VALUE 0x3fffL
#define RUN_MAX 20
#define STRIP_MAX 100
#define STYLE_DENSITY 3
// Flip and round flags:
#define FL_H_ROUND_DOWN 0x00000080L // .... .... 1... ....
#define FL_V_ROUND_DOWN 0x00008000L // 1... .... .... ....
#define FL_FLIP_D 0x00000005L // .... .... .... .1.1
#define FL_FLIP_V 0x00000008L // .... .... .... 1...
#define FL_FLIP_SLOPE_ONE 0x00000010L // .... .... ...1 ....
#define FL_FLIP_HALF 0x00000002L // .... .... .... ..1.
#define FL_FLIP_H 0x00000200L // .... ..1. .... ....
#define FL_ROUND_MASK 0x0000001CL // .... .... ...1 11..
#define FL_ROUND_SHIFT 2
#define FL_RECTLCLIP_MASK 0x0000000CL // .... .... .... 11..
#define FL_RECTLCLIP_SHIFT 2
#define FL_STRIP_MASK 0x00000003L // .... .... .... ..11
#define FL_STRIP_SHIFT 0
#define FL_SIMPLE_CLIP 0x00000020 // .... .... ..1. ....
#define FL_COMPLEX_CLIP 0x00000040 // .... .... .1.. ....
#define FL_CLIP (FL_SIMPLE_CLIP | FL_COMPLEX_CLIP)
#define FL_STYLED 0x00000400L // .... .1.. .... ....
#define FL_ALTERNATESTYLED 0x00001000L // ...1 .... .... ....
#define FL_STYLE_MASK 0x00000400L
#define FL_STYLE_SHIFT 10
#define FL_LAST_PEL_INCLUSIVE 0x00002000L // ..1. .... .... ....
// Miscellaneous DDA defines:
#define LROUND(x, flRoundDown) (((x) + F/2 - ((flRoundDown) > 0)) >> 4)
#define F 16
#define FLOG2 4
#define LFLOOR(x) ((x) >> 4)
#define FXFRAC(x) ((x) & (F - 1))
////////////////////////////////////////////////////////////////////////////
// NOTE: The following structures must exactly match those declared in
// lines.inc!
typedef struct _STRIP { LONG cStrips; // # of strips in array
LONG flFlips; // Indicates if line goes up or down
POINTL ptlStart; // first point
LONG alStrips[STRIP_MAX]; // Array of strips
} STRIP;
typedef struct _LINESTATE { STYLEPOS* pspStart; // Pointer to start of style array
STYLEPOS* pspEnd; // Pointer to end of style array
STYLEPOS* psp; // Pointer to current style entry
STYLEPOS spRemaining; // To go in current style
STYLEPOS spTotal; // Sum of style array
STYLEPOS spTotal2; // Twice sum of style array
STYLEPOS spNext; // Style state at start of next line
STYLEPOS spComplex; // Style state at start of complex clip line
STYLEPOS* aspRtoL; // Style array in right-to-left order
STYLEPOS* aspLtoR; // Style array in left-to-right order
ULONG ulStyleMask; // Are we working on a gap in the style?
// 0xff if yes, 0x0 if not
ULONG xyDensity; // Density of style
ULONG cStyle; // Size of style array
ULONG ulStyleMaskLtoR;// Original style mask, left-to-right order
ULONG ulStyleMaskRtoL;// Original style mask, right-to-left order
BOOL ulStartMask; // Determines if first element in style
// array is for a gap or a dash
} LINESTATE; /* ls */
// Strip drawer prototype:
typedef VOID (*PFNSTRIP)(PDEV*, STRIP*, LINESTATE*);
// Strip drawers:
VOID vStripSolidHorizontal(PDEV*, STRIP*, LINESTATE*);VOID vStripSolidVertical(PDEV*, STRIP*, LINESTATE*);VOID vStripSolidDiagonalHorizontal(PDEV*, STRIP*, LINESTATE*);VOID vStripSolidDiagonalVertical(PDEV*, STRIP*, LINESTATE*);VOID vStripStyledHorizontal(PDEV*, STRIP*, LINESTATE*);VOID vStripStyledVertical(PDEV*, STRIP*, LINESTATE*);
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