xref: /xsrc/external/mit/xf86-video-intel-2014/dist/src/sna/fb/fbtile.c

/*
 * Copyright © 1998 Keith Packard
 * Copyright © 2012 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include "fb.h"

/*
 * Accelerated tile fill -- tile width is a power of two not greater
 * than FB_UNIT
 */

static void
fbEvenTile(FbBits *dst, FbStride dstStride, int dstX, int width, int height,
           FbBits *tile, FbStride tileStride, int tileHeight,
	   int alu, FbBits pm,
	   int xRot, int yRot)
{
	FbBits *t, *tileEnd, bits;
	FbBits startmask, endmask;
	FbBits and, xor;
	int n, nmiddle;
	int tileX, tileY;
	int rot;
	int startbyte, endbyte;

	dst += dstX >> FB_SHIFT;
	dstX &= FB_MASK;
	FbMaskBitsBytes(dstX, width, FbDestInvarientRop(alu, pm),
			startmask, startbyte, nmiddle, endmask, endbyte);
	if (startmask)
		dstStride--;
	dstStride -= nmiddle;

	/*
	 * Compute tile start scanline and rotation parameters
	 */
	tileEnd = tile + tileHeight * tileStride;
	modulus(-yRot, tileHeight, tileY);
	t = tile + tileY * tileStride;
	modulus(-xRot, FB_UNIT, tileX);
	rot = tileX;

	while (height--) {
		/*
		 * Pick up bits for this scanline
		 */
		bits = READ(t);
		t += tileStride;
		if (t >= tileEnd)
			t = tile;
		bits = FbRotLeft(bits, rot);
		and = fbAnd(alu, bits, pm);
		xor = fbXor(alu, bits, pm);

		if (startmask) {
			FbDoLeftMaskByteRRop(dst, startbyte, startmask, and, xor);
			dst++;
		}
		n = nmiddle;
		if (!and)
			while (n--)
				WRITE(dst++, xor);
		else
			while (n--) {
				WRITE(dst, FbDoRRop(READ(dst), and, xor));
				dst++;
			}
		if (endmask)
			FbDoRightMaskByteRRop(dst, endbyte, endmask, and, xor);
		dst += dstStride;
	}
}

static void
fbOddTile(FbBits *dst, FbStride dstStride, int dstX,
          int width, int height,
          FbBits *tile, FbStride tileStride,
          int tileWidth, int tileHeight,
	  int alu, FbBits pm, int bpp,
	  int xRot, int yRot)
{
	int tileX, tileY;
	int x, y;

	DBG(("%s tile=%dx%d, size=%dx%d\n", __FUNCTION__,
	     tileWidth, tileHeight, width, height));

	modulus(-yRot, tileHeight, tileY);
	y = 0;
	while (height) {
		int ww = width;
		int h = tileHeight - tileY;
		if (h > height)
			h = height;
		height -= h;
		x = dstX;
		modulus(dstX - xRot, tileWidth, tileX);
		while (ww) {
			int w = tileWidth - tileX;
			if (w > ww)
				w = ww;
			ww -= w;
			fbBlt(tile + tileY * tileStride, tileStride, tileX,
			      dst + y * dstStride, dstStride,
			      x, w, h, alu, pm, bpp, FALSE, FALSE);
			x += w;
			tileX = 0;
		}
		y += h;
		tileY = 0;
	}
}

void
fbTile(FbBits *dst, FbStride dstStride, int dstX,
       int width, int height,
       FbBits *tile, FbStride tileStride,
       int tileWidth, int tileHeight,
       int alu, FbBits pm, int bpp,
       int xRot, int yRot)
{
	DBG(("%s tile=%dx%d, size=%dx%d\n", __FUNCTION__,
	     tileWidth, tileHeight, width, height));

	if (FbEvenTile(tileWidth))
		fbEvenTile(dst, dstStride, dstX, width, height,
			   tile, tileStride, tileHeight, alu, pm, xRot, yRot);
	else
		fbOddTile(dst, dstStride, dstX, width, height,
			  tile, tileStride, tileWidth, tileHeight,
			  alu, pm, bpp, xRot, yRot);
}