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/*
* Support for RENDER extension while protecting the alpha channel
*/
/*
* Copyright (c) 2002-2003 Torrey T. Lyons. All Rights Reserved.
* Copyright (c) 2002 Apple Computer, Inc. All Rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the sale,
* use or other dealings in this Software without prior written authorization.
*/
/* This file is largely based on fbcompose.c and fbpict.c, which contain
* the following copyright:
*
* Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#ifdef RENDER
#include <stddef.h> /* For NULL */
#include "fb.h"
#include "picturestr.h"
#include "mipict.h"
#include "fbpict.h"
#include "safeAlpha.h"
#include "rootlessCommon.h"
# define mod(a,b) ((b) == 1 ? 0 : (a) >= 0 ? (a) % (b) : (b) - (-a) % (b))
/* Optimized version of fbCompositeSolidMask_nx8x8888 */
void
SafeAlphaCompositeSolidMask_nx8x8888(
CARD8 op,
PicturePtr pSrc,
PicturePtr pMask,
PicturePtr pDst,
INT16 xSrc,
INT16 ySrc,
INT16 xMask,
INT16 yMask,
INT16 xDst,
INT16 yDst,
CARD16 width,
CARD16 height)
{
CARD32 src, srca;
CARD32 *dstLine, *dst, d, dstMask;
CARD8 *maskLine, *mask, m;
FbStride dstStride, maskStride;
CARD16 w;
fbComposeGetSolid(pSrc, src, pDst->format);
dstMask = FbFullMask (pDst->pDrawable->depth);
srca = src >> 24;
if (src == 0)
return;
fbComposeGetStart (pDst, xDst, yDst, CARD32, dstStride, dstLine, 1);
fbComposeGetStart (pMask, xMask, yMask, CARD8, maskStride, maskLine, 1);
if (dstMask == FB_ALLONES && pDst->pDrawable->bitsPerPixel == 32 &&
width * height > rootless_CompositePixels_threshold &&
SCREENREC(pDst->pDrawable->pScreen)->imp->CompositePixels)
{
void *srcp[2], *destp[2];
unsigned int dest_rowbytes[2];
unsigned int fn;
srcp[0] = &src; srcp[1] = &src;
/* null rowbytes pointer means use first value as a constant */
destp[0] = dstLine; destp[1] = dstLine;
dest_rowbytes[0] = dstStride * 4; dest_rowbytes[1] = dest_rowbytes[0];
fn = RL_COMPOSITE_FUNCTION(RL_COMPOSITE_OVER, RL_DEPTH_ARGB8888,
RL_DEPTH_A8, RL_DEPTH_ARGB8888);
if (SCREENREC(pDst->pDrawable->pScreen)->imp->CompositePixels(
width, height, fn, srcp, NULL,
maskLine, maskStride,
destp, dest_rowbytes) == Success)
{
return;
}
}
while (height--)
{
dst = dstLine;
dstLine += dstStride;
mask = maskLine;
maskLine += maskStride;
w = width;
while (w--)
{
m = *mask++;
if (m == 0xff)
{
if (srca == 0xff)
*dst = src & dstMask;
else
*dst = fbOver (src, *dst) & dstMask;
}
else if (m)
{
d = fbIn (src, m);
*dst = fbOver (d, *dst) & dstMask;
}
dst++;
}
}
}
void
SafeAlphaComposite (CARD8 op,
PicturePtr pSrc,
PicturePtr pMask,
PicturePtr pDst,
INT16 xSrc,
INT16 ySrc,
INT16 xMask,
INT16 yMask,
INT16 xDst,
INT16 yDst,
CARD16 width,
CARD16 height)
{
if (!pSrc) {
ErrorF("SafeAlphaComposite: pSrc must not be null!\n");
return;
}
if (!pDst) {
ErrorF("SafeAlphaComposite: pDst must not be null!\n");
return;
}
int oldDepth = pDst->pDrawable->depth;
int oldFormat = pDst->format;
/*
* We can use the more optimized fbpict code, but it sets bits above
* the depth to zero. Temporarily adjust destination depth if needed.
*/
if (pDst->pDrawable->type == DRAWABLE_WINDOW
&& pDst->pDrawable->depth == 24
&& pDst->pDrawable->bitsPerPixel == 32)
{
pDst->pDrawable->depth = 32;
}
/* For rootless preserve the alpha in x8r8g8b8 which really is
* a8r8g8b8
*/
if (oldFormat == PICT_x8r8g8b8)
{
pDst->format = PICT_a8r8g8b8;
}
if (pSrc->pDrawable && pMask && pMask->pDrawable &&
!pSrc->transform && !pMask->transform &&
!pSrc->alphaMap && !pMask->alphaMap &&
!pMask->repeat && !pMask->componentAlpha && !pDst->alphaMap &&
pMask->format == PICT_a8 &&
pSrc->repeatType == RepeatNormal &&
pSrc->pDrawable->width == 1 &&
pSrc->pDrawable->height == 1 &&
(pDst->format == PICT_a8r8g8b8 ||
pDst->format == PICT_x8r8g8b8 ||
pDst->format == PICT_a8b8g8r8 ||
pDst->format == PICT_x8b8g8r8))
{
fbWalkCompositeRegion (op, pSrc, pMask, pDst,
xSrc, ySrc, xMask, yMask, xDst, yDst,
width, height,
TRUE /* srcRepeat */,
FALSE /* maskRepeat */,
SafeAlphaCompositeSolidMask_nx8x8888);
}
else
{
fbComposite (op, pSrc, pMask, pDst,
xSrc, ySrc, xMask, yMask, xDst, yDst, width, height);
}
pDst->pDrawable->depth = oldDepth;
pDst->format = oldFormat;
}
#endif /* RENDER */
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