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- /*
- * cfb8bit.c
- *
- * 8 bit color frame buffer utility routines
- */
-
- /* $XConsortium: cfb8bit.c,v 1.5 91/01/27 13:02:56 keith Exp $ */
-
- #include "X.h"
- #include "Xmd.h"
- #include "Xproto.h"
- #include "gcstruct.h"
- #include "windowstr.h"
- #include "scrnintstr.h"
- #include "pixmapstr.h"
- #include "regionstr.h"
- #include "cfb.h"
- #include "cfbmskbits.h"
- #include "cfb8bit.h"
-
- #if (PPW == 4)
-
- unsigned long cfb8StippleMasks[16] = {
- 0x00000000, 0x000000ff, 0x0000ff00, 0x0000ffff,
- 0x00ff0000, 0x00ff00ff, 0x00ffff00, 0x00ffffff,
- 0xff000000, 0xff0000ff, 0xff00ff00, 0xff00ffff,
- 0xffff0000, 0xffff00ff, 0xffffff00, 0xffffffff,
- };
-
- int cfb8StippleMode, cfb8StippleAlu, cfb8StippleRRop;
- unsigned long cfb8StippleFg, cfb8StippleBg, cfb8StipplePm;
- unsigned long cfb8StippleAnd[16], cfb8StippleXor[16];
-
- int
- cfb8SetStipple (alu, fg, planemask)
- int alu;
- unsigned long fg, planemask;
- {
- unsigned long and, xor, rrop;
- int s;
- unsigned long c;
-
- cfb8StippleMode = FillStippled;
- cfb8StippleAlu = alu;
- cfb8StippleFg = fg & PMSK;
- rrop = cfbReduceRasterOp (alu, fg, planemask, &and, &xor);
- cfb8StippleRRop = rrop;
- /*
- * create the appropriate pixel-fill bits for current
- * foreground
- */
- for (s = 0; s < 16; s++)
- {
- c = cfb8StippleMasks[s];
- cfb8StippleAnd[s] = and | ~c;
- cfb8StippleXor[s] = xor & c;
- }
- }
-
- int
- cfb8SetOpaqueStipple (alu, fg, bg, planemask)
- int alu;
- unsigned long fg, bg, planemask;
- {
- unsigned long andfg, xorfg, andbg, xorbg, rropfg, rropbg;
- int s;
- unsigned long c;
-
- cfb8StippleMode = FillOpaqueStippled;
- cfb8StippleAlu = alu;
- cfb8StippleFg = fg & PMSK;
- cfb8StippleBg = bg & PMSK;
- cfb8StipplePm = planemask & PMSK;
- rropfg = cfbReduceRasterOp (alu, cfb8StippleFg, cfb8StipplePm, &andfg, &xorfg);
- rropbg = cfbReduceRasterOp (alu, cfb8StippleBg, cfb8StipplePm, &andbg, &xorbg);
- if (rropfg == rropbg)
- cfb8StippleRRop = rropfg;
- else
- cfb8StippleRRop = GXset;
- /*
- * create the appropriate pixel-fill bits for current
- * foreground
- */
- for (s = 0; s < 16; s++)
- {
- c = cfb8StippleMasks[s];
- cfb8StippleAnd[s] = (andfg | ~c) & (andbg | c);
- cfb8StippleXor[s] = (xorfg & c) | (xorbg & ~c);
- }
- }
-
- /*
- * a grungy little routine. This computes clip masks
- * for partial character blts. Returns rgnOUT if the
- * entire character is clipped; returns rgnIN if the entire
- * character is unclipped; returns rgnPART if a portion of
- * the character is visible. Computes clip masks for each
- * longword of the character -- and those with the
- * contents of the glyph to compute the visible bits.
- */
-
- #if (BITMAP_BIT_ORDER == MSBFirst)
- unsigned long cfb8BitLenMasks[32] = {
- 0xffffffff, 0x7fffffff, 0x3fffffff, 0x1fffffff,
- 0x0fffffff, 0x07ffffff, 0x03ffffff, 0x01ffffff,
- 0x00ffffff, 0x007fffff, 0x003fffff, 0x001fffff,
- 0x000fffff, 0x0007ffff, 0x0003ffff, 0x0001ffff,
- 0x0000ffff, 0x00007fff, 0x00003fff, 0x00001fff,
- 0x00000fff, 0x000007ff, 0x000003ff, 0x000001ff,
- 0x000000ff, 0x0000007f, 0x0000003f, 0x0000001f,
- 0x0000000f, 0x00000007, 0x00000003, 0x00000001,
- };
- #else
- unsigned long cfb8BitLenMasks[32] = {
- 0xffffffff, 0xfffffffe, 0xfffffffc, 0xfffffff8,
- 0xfffffff0, 0xffffffe0, 0xffffffc0, 0xffffff80,
- 0xffffff00, 0xfffffe00, 0xfffffc00, 0xfffff800,
- 0xfffff000, 0xffffe000, 0xffffc000, 0xffff8000,
- 0xffff0000, 0xfffe0000, 0xfffc0000, 0xfff80000,
- 0xfff00000, 0xffe00000, 0xffc00000, 0xff800000,
- 0xff000000, 0xfe000000, 0xfc000000, 0xf8000000,
- 0xf0000000, 0xe0000000, 0xc0000000, 0x80000000,
- };
- #endif
-
- int
- cfb8ComputeClipMasks32 (pBox, numRects, x, y, w, h, clips)
- BoxPtr pBox;
- int numRects;
- int x, y, w, h;
- unsigned long *clips;
- {
- int yBand, yBandBot;
- int ch;
- unsigned long clip;
- int partIN = FALSE, partOUT = FALSE;
- int result;
-
- if (numRects == 0)
- return rgnOUT;
- while (numRects && pBox->y2 <= y)
- {
- --numRects;
- ++pBox;
- }
- if (!numRects || pBox->y1 >= y + h)
- return rgnOUT;
- yBand = pBox->y1;
- while (numRects && pBox->y1 == yBand && pBox->x2 <= x)
- {
- --numRects;
- ++pBox;
- }
- if (!numRects || pBox->y1 >= y + h)
- return rgnOUT;
- if (numRects &&
- x >= pBox->x1 &&
- x + w <= pBox->x2 &&
- y >= pBox->y1 &&
- y + h <= pBox->y2)
- {
- return rgnIN;
- }
- ch = 0;
- while (ch < h && y + ch < pBox->y1)
- {
- partOUT = TRUE;
- clips[ch++] = 0;
- }
- while (numRects && pBox->y1 < y + h)
- {
- yBand = pBox->y1;
- yBandBot = pBox->y2;
- while (numRects && pBox->y1 == yBand && pBox->x2 <= x)
- {
- --numRects;
- ++pBox;
- }
- if (!numRects)
- break;
- clip = 0;
- while (numRects && pBox->y1 == yBand && pBox->x1 < x + w)
- {
- if (x < pBox->x1)
- if (pBox->x2 < x + w)
- clip |= cfb8BitLenMasks[pBox->x1 - x] & ~cfb8BitLenMasks[pBox->x2 - x];
- else
- clip |= cfb8BitLenMasks[pBox->x1 - x];
- else
- if (pBox->x2 < x + w)
- clip |= ~cfb8BitLenMasks[pBox->x2 - x];
- else
- clip = ~0;
- --numRects;
- ++pBox;
- }
- if (clip != 0)
- partIN = TRUE;
- if (clip != ~0)
- partOUT = TRUE;
- while (ch < h && y + ch < yBandBot)
- clips[ch++] = clip;
- while (numRects && pBox->y1 == yBand)
- {
- --numRects;
- ++pBox;
- }
- }
- while (ch < h)
- {
- partOUT = TRUE;
- clips[ch++] = 0;
- }
- result = rgnOUT;
- if (partIN)
- {
- if (partOUT)
- result = rgnPART;
- else
- result = rgnIN;
- }
- return result;
- }
-
- #endif /* PPW == 4 */
-