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IABSD.fr/xenocara/xserver/render/filter.c
matthieu
- xserver/render/filter.c
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/* * Copyright © 2002 Keith Packard * * 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. */ #ifdef HAVE_DIX_CONFIG_H #include <dix-config.h> #endif #include "misc.h" #include "scrnintstr.h" #include "os.h" #include "regionstr.h" #include "validate.h" #include "windowstr.h" #include "input.h" #include "resource.h" #include "colormapst.h" #include "cursorstr.h" #include "dixstruct.h" #include "gcstruct.h" #include "servermd.h" #include "picturestr.h" static char **filterNames; static int nfilterNames; /* * standard but not required filters don't have constant indices */ int PictureGetFilterId(const char *filter, int len, Bool makeit) { int i; char *name; char **names; if (len < 0) len = strlen(filter); for (i = 0; i < nfilterNames; i++) if (!CompareISOLatin1Lowered((const unsigned char *) filterNames[i], -1, (const unsigned char *) filter, len)) return i; if (!makeit) return -1; name = malloc(len + 1); if (!name) return -1; memcpy(name, filter, len); name[len] = '\0'; if (filterNames) names = reallocarray(filterNames, nfilterNames + 1, sizeof(char *)); else names = malloc(sizeof(char *)); if (!names) { free(name); return -1; } filterNames = names; i = nfilterNames++; filterNames[i] = name; return i; } static Bool PictureSetDefaultIds(void) { /* careful here -- this list must match the #define values */ if (PictureGetFilterId(FilterNearest, -1, TRUE) != PictFilterNearest) return FALSE; if (PictureGetFilterId(FilterBilinear, -1, TRUE) != PictFilterBilinear) return FALSE; if (PictureGetFilterId(FilterFast, -1, TRUE) != PictFilterFast) return FALSE; if (PictureGetFilterId(FilterGood, -1, TRUE) != PictFilterGood) return FALSE; if (PictureGetFilterId(FilterBest, -1, TRUE) != PictFilterBest) return FALSE; if (PictureGetFilterId(FilterConvolution, -1, TRUE) != PictFilterConvolution) return FALSE; return TRUE; } char * PictureGetFilterName(int id) { if (0 <= id && id < nfilterNames) return filterNames[id]; else return 0; } static void PictureFreeFilterIds(void) { int i; for (i = 0; i < nfilterNames; i++) free(filterNames[i]); free(filterNames); nfilterNames = 0; filterNames = 0; } int PictureAddFilter(ScreenPtr pScreen, const char *filter, PictFilterValidateParamsProcPtr ValidateParams, int width, int height) { PictureScreenPtr ps = GetPictureScreen(pScreen); int id = PictureGetFilterId(filter, -1, TRUE); int i; PictFilterPtr filters; if (id < 0) return -1; /* * It's an error to attempt to reregister a filter */ for (i = 0; i < ps->nfilters; i++) if (ps->filters[i].id == id) return -1; if (ps->filters) filters = reallocarray(ps->filters, ps->nfilters + 1, sizeof(PictFilterRec)); else filters = malloc(sizeof(PictFilterRec)); if (!filters) return -1; ps->filters = filters; i = ps->nfilters++; ps->filters[i].name = PictureGetFilterName(id); ps->filters[i].id = id; ps->filters[i].ValidateParams = ValidateParams; ps->filters[i].width = width; ps->filters[i].height = height; return id; } Bool PictureSetFilterAlias(ScreenPtr pScreen, const char *filter, const char *alias) { PictureScreenPtr ps = GetPictureScreen(pScreen); int filter_id = PictureGetFilterId(filter, -1, FALSE); int alias_id = PictureGetFilterId(alias, -1, TRUE); int i; if (filter_id < 0 || alias_id < 0) return FALSE; for (i = 0; i < ps->nfilterAliases; i++) if (ps->filterAliases[i].alias_id == alias_id) break; if (i == ps->nfilterAliases) { PictFilterAliasPtr aliases; if (ps->filterAliases) aliases = reallocarray(ps->filterAliases, ps->nfilterAliases + 1, sizeof(PictFilterAliasRec)); else aliases = malloc(sizeof(PictFilterAliasRec)); if (!aliases) return FALSE; ps->filterAliases = aliases; ps->filterAliases[i].alias = PictureGetFilterName(alias_id); ps->filterAliases[i].alias_id = alias_id; ps->nfilterAliases++; } ps->filterAliases[i].filter_id = filter_id; return TRUE; } PictFilterPtr PictureFindFilter(ScreenPtr pScreen, char *name, int len) { PictureScreenPtr ps = GetPictureScreen(pScreen); int id = PictureGetFilterId(name, len, FALSE); int i; if (id < 0) return 0; /* Check for an alias, allow them to recurse */ for (i = 0; i < ps->nfilterAliases; i++) if (ps->filterAliases[i].alias_id == id) { id = ps->filterAliases[i].filter_id; i = 0; } /* find the filter */ for (i = 0; i < ps->nfilters; i++) if (ps->filters[i].id == id) return &ps->filters[i]; return 0; } static Bool convolutionFilterValidateParams(ScreenPtr pScreen, int filter, xFixed * params, int nparams, int *width, int *height) { int w, h; if (nparams < 3) return FALSE; if (xFixedFrac(params[0]) || xFixedFrac(params[1])) return FALSE; w = xFixedToInt(params[0]); h = xFixedToInt(params[1]); nparams -= 2; if (w * h > nparams) return FALSE; *width = w; *height = h; return TRUE; } Bool PictureSetDefaultFilters(ScreenPtr pScreen) { if (!filterNames) if (!PictureSetDefaultIds()) return FALSE; if (PictureAddFilter(pScreen, FilterNearest, 0, 1, 1) < 0) return FALSE; if (PictureAddFilter(pScreen, FilterBilinear, 0, 2, 2) < 0) return FALSE; if (!PictureSetFilterAlias(pScreen, FilterNearest, FilterFast)) return FALSE; if (!PictureSetFilterAlias(pScreen, FilterBilinear, FilterGood)) return FALSE; if (!PictureSetFilterAlias(pScreen, FilterBilinear, FilterBest)) return FALSE; if (PictureAddFilter (pScreen, FilterConvolution, convolutionFilterValidateParams, 0, 0) < 0) return FALSE; return TRUE; } void PictureResetFilters(ScreenPtr pScreen) { PictureScreenPtr ps = GetPictureScreen(pScreen); free(ps->filters); free(ps->filterAliases); /* Free the filters when the last screen is closed */ if (pScreen->myNum == 0) PictureFreeFilterIds(); } int SetPictureFilter(PicturePtr pPicture, char *name, int len, xFixed * params, int nparams) { PictFilterPtr pFilter; ScreenPtr pScreen; if (pPicture->pDrawable != NULL) pScreen = pPicture->pDrawable->pScreen; else pScreen = screenInfo.screens[0]; pFilter = PictureFindFilter(pScreen, name, len); if (!pFilter) return BadName; if (pPicture->pDrawable == NULL) { int s; /* For source pictures, the picture isn't tied to a screen. So, ensure * that all screens can handle a filter we set for the picture. */ for (s = 1; s < screenInfo.numScreens; s++) { PictFilterPtr pScreenFilter; pScreenFilter = PictureFindFilter(screenInfo.screens[s], name, len); if (!pScreenFilter || pScreenFilter->id != pFilter->id) return BadMatch; } } return SetPicturePictFilter(pPicture, pFilter, params, nparams); } int SetPicturePictFilter(PicturePtr pPicture, PictFilterPtr pFilter, xFixed * params, int nparams) { ScreenPtr pScreen; int i; if (pPicture->pDrawable) pScreen = pPicture->pDrawable->pScreen; else pScreen = screenInfo.screens[0]; if (pFilter->ValidateParams) { int width, height; if (!(*pFilter->ValidateParams) (pScreen, pFilter->id, params, nparams, &width, &height)) return BadMatch; } else if (nparams) return BadMatch; if (nparams != pPicture->filter_nparams) { xFixed *new_params = xallocarray(nparams, sizeof(xFixed)); if (!new_params && nparams) return BadAlloc; free(pPicture->filter_params); pPicture->filter_params = new_params; pPicture->filter_nparams = nparams; } for (i = 0; i < nparams; i++) pPicture->filter_params[i] = params[i]; pPicture->filter = pFilter->id; if (pPicture->pDrawable) { PictureScreenPtr ps = GetPictureScreen(pScreen); int result; result = (*ps->ChangePictureFilter) (pPicture, pPicture->filter, params, nparams); return result; } return Success; }