diff options
Diffstat (limited to 'xorg-server/miext/rootless/safeAlpha/safeAlphaPicture.c')
| -rw-r--r-- | xorg-server/miext/rootless/safeAlpha/safeAlphaPicture.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/xorg-server/miext/rootless/safeAlpha/safeAlphaPicture.c b/xorg-server/miext/rootless/safeAlpha/safeAlphaPicture.c new file mode 100644 index 000000000..8f6631531 --- /dev/null +++ b/xorg-server/miext/rootless/safeAlpha/safeAlphaPicture.c @@ -0,0 +1,211 @@ +/* + * 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 */ |