153 lines
5.9 KiB
C
153 lines
5.9 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: lines.h
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*
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* Line drawing constants and structures.
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*
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* NOTE: This file mirrors LINES.INC. Changes here must be reflected in
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* the .inc file!
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*
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* Copyright (c) 1992-1994 Microsoft Corporation
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\**************************************************************************/
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typedef struct _PDEV PDEV; // Handy forward declaration
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// We have to be careful that we don't overflow any registers when using
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// the hardware to draw lines (as opposed to going through the strips
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// routines, which will never overflow). We accomplish this by simply
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// checking the bounds of the path; if it is so large that any of the
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// hardware terms may overflow, we punt the entire path to the strips
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// code (should be pretty rare).
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#define MAX_INTEGER_BOUND (1535) // S3's line length term is limited to
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#define MIN_INTEGER_BOUND (-512) // a maximum value of 2047
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// We have special strip routines when all strips have at most this many
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// pixels:
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#define MAX_SHORT_STROKE_LENGTH 15
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// # of strip drawers in every group:
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#define NUM_STRIP_DRAW_DIRECTIONS 4
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// # of strip drawers for doing either solid lines or styled lines:
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#define NUM_STRIP_DRAW_STYLES 8
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typedef LONG STYLEPOS;
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#define STYLE_MAX_COUNT 16
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#define STYLE_MAX_VALUE 0x3fffL
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#define RUN_MAX 20
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#define STRIP_MAX 100
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#define STYLE_DENSITY 3
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// Flip and round flags:
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#define FL_H_ROUND_DOWN 0x00000080L // .... .... 1... ....
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#define FL_V_ROUND_DOWN 0x00000100L // .... ...1 .... ....
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#define FL_FLIP_D 0x00000005L // .... .... .... .1.1
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#define FL_FLIP_V 0x00000008L // .... .... .... 1...
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#define FL_FLIP_SLOPE_ONE 0x00000010L // .... .... ...1 ....
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#define FL_FLIP_HALF 0x00000002L // .... .... .... ..1.
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#define FL_FLIP_H 0x00000200L // .... ..1. .... ....
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#define FL_ROUND_MASK 0x0000001CL // .... .... ...1 11..
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#define FL_ROUND_SHIFT 2
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#define FL_RECTLCLIP_MASK 0x0000000CL // .... .... .... 11..
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#define FL_RECTLCLIP_SHIFT 2
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#define FL_STRIP_MASK 0x00000003L // .... .... .... ..11
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#define FL_STRIP_SHIFT 0
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#define FL_SIMPLE_CLIP 0x00000020 // .... .... ..1. ....
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#define FL_COMPLEX_CLIP 0x00000040 // .... .... .1.. ....
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#define FL_CLIP (FL_SIMPLE_CLIP | FL_COMPLEX_CLIP)
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#define FL_ARBITRARYSTYLED 0x00000400L // .... .1.. .... ....
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#define FL_MASKSTYLED 0x00000800L // .... 1... .... ....
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#define FL_STYLED (FL_ARBITRARYSTYLED | FL_MASKSTYLED)
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#define FL_ALTERNATESTYLED 0x00001000L // ...1 .... .... ....
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#define FL_STYLE_MASK 0x00000C00L
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#define FL_STYLE_SHIFT 10
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// Simpler flag bits in high byte:
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#define FL_DONT_DO_HALF_FLIP 0x00002000L // ..1. .... .... ....
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#define FL_PHYSICAL_DEVICE 0x00004000L // .1.. .... .... ....
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// Miscellaneous DDA defines:
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#define LROUND(x, flRoundDown) (((x) + F/2 - ((flRoundDown) > 0)) >> 4)
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#define F 16
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#define FLOG2 4
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#define LFLOOR(x) ((x) >> 4)
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#define FXFRAC(x) ((x) & (F - 1))
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////////////////////////////////////////////////////////////////////////////
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// NOTE: The following structures must exactly match those declared in
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// lines.inc!
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typedef struct _STRIP {
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LONG cStrips; // # of strips in array
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LONG flFlips; // Indicates if line goes up or down
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POINTL ptlStart; // first point
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LONG alStrips[STRIP_MAX]; // Array of strips
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} STRIP;
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typedef struct _LINESTATE {
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STYLEPOS* pspStart; // Pointer to start of style array
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STYLEPOS* pspEnd; // Pointer to end of style array
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STYLEPOS* psp; // Pointer to current style entry
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STYLEPOS spRemaining; // To go in current style
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STYLEPOS spTotal; // Sum of style array
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STYLEPOS spTotal2; // Twice sum of style array
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STYLEPOS spNext; // Style state at start of next line
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STYLEPOS spComplex; // Style state at start of complex clip line
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STYLEPOS* aspRtoL; // Style array in right-to-left order
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STYLEPOS* aspLtoR; // Style array in left-to-right order
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ULONG ulStyleMask; // Are we working on a gap in the style?
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// 0xff if yes, 0x0 if not
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ULONG xyDensity; // Density of style
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ULONG cStyle; // Size of style array
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ULONG ulStyleMaskLtoR;// Original style mask, left-to-right order
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ULONG ulStyleMaskRtoL;// Original style mask, right-to-left order
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BOOL ulStartMask; // Determines if first element in style
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// array is for a gap or a dash
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} LINESTATE; /* ls */
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// Strip drawer prototype:
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typedef VOID (*PFNSTRIP)(PDEV*, STRIP*, LINESTATE*);
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// Strip drawers:
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VOID vssSolidHorizontal(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vrlSolidHorizontal(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vssSolidVertical(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vrlSolidVertical(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vssSolidDiagonalHorizontal(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vrlSolidDiagonalHorizontal(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vssSolidDiagonalVertical(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vrlSolidDiagonalVertical(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vStripStyledHorizontal(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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VOID vStripStyledVertical(PDEV* ppdev, STRIP *pStrip, LINESTATE *pLineState);
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// External calls:
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BOOL bLines(PDEV*, POINTFIX*, POINTFIX*, RUN* prun, ULONG,
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LINESTATE*, RECTL*, PFNSTRIP*, FLONG);
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