[deb_xorg-server.git] / render / picture.c

/*
 *
 * Copyright © 2000 SuSE, Inc.
 *
 * 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 SuSE not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  SuSE makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
 * 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.
 *
 * Author:  Keith Packard, SuSE, Inc.
 */

#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"
#include "xace.h"

DevPrivateKeyRec PictureScreenPrivateKeyRec;
DevPrivateKeyRec PictureWindowPrivateKeyRec;
static int PictureGeneration;
RESTYPE PictureType;
RESTYPE PictFormatType;
RESTYPE GlyphSetType;
int PictureCmapPolicy = PictureCmapPolicyDefault;

PictFormatPtr
PictureWindowFormat(WindowPtr pWindow)
{
    ScreenPtr pScreen = pWindow->drawable.pScreen;
    return PictureMatchVisual(pScreen, pWindow->drawable.depth,
                              WindowGetVisual(pWindow));
}

Bool
PictureDestroyWindow(WindowPtr pWindow)
{
    ScreenPtr pScreen = pWindow->drawable.pScreen;
    PicturePtr pPicture;
    PictureScreenPtr ps = GetPictureScreen(pScreen);
    Bool ret;

    while ((pPicture = GetPictureWindow(pWindow))) {
        SetPictureWindow(pWindow, pPicture->pNext);
        if (pPicture->id)
            FreeResource(pPicture->id, PictureType);
        FreePicture((pointer) pPicture, pPicture->id);
    }
    pScreen->DestroyWindow = ps->DestroyWindow;
    ret = (*pScreen->DestroyWindow) (pWindow);
    ps->DestroyWindow = pScreen->DestroyWindow;
    pScreen->DestroyWindow = PictureDestroyWindow;
    return ret;
}

Bool
PictureCloseScreen(ScreenPtr pScreen)
{
    PictureScreenPtr ps = GetPictureScreen(pScreen);
    Bool ret;
    int n;

    pScreen->CloseScreen = ps->CloseScreen;
    ret = (*pScreen->CloseScreen) (pScreen);
    PictureResetFilters(pScreen);
    for (n = 0; n < ps->nformats; n++)
        if (ps->formats[n].type == PictTypeIndexed)
            (*ps->CloseIndexed) (pScreen, &ps->formats[n]);
    GlyphUninit(pScreen);
    SetPictureScreen(pScreen, 0);
    free(ps->formats);
    free(ps);
    return ret;
}

void
PictureStoreColors(ColormapPtr pColormap, int ndef, xColorItem * pdef)
{
    ScreenPtr pScreen = pColormap->pScreen;
    PictureScreenPtr ps = GetPictureScreen(pScreen);

    pScreen->StoreColors = ps->StoreColors;
    (*pScreen->StoreColors) (pColormap, ndef, pdef);
    ps->StoreColors = pScreen->StoreColors;
    pScreen->StoreColors = PictureStoreColors;

    if (pColormap->class == PseudoColor || pColormap->class == GrayScale) {
        PictFormatPtr format = ps->formats;
        int nformats = ps->nformats;

        while (nformats--) {
            if (format->type == PictTypeIndexed &&
                format->index.pColormap == pColormap) {
                (*ps->UpdateIndexed) (pScreen, format, ndef, pdef);
                break;
            }
            format++;
        }
    }
}

static int
visualDepth(ScreenPtr pScreen, VisualPtr pVisual)
{
    int d, v;
    DepthPtr pDepth;

    for (d = 0; d < pScreen->numDepths; d++) {
        pDepth = &pScreen->allowedDepths[d];
        for (v = 0; v < pDepth->numVids; v++)
            if (pDepth->vids[v] == pVisual->vid)
                return pDepth->depth;
    }
    return 0;
}

typedef struct _formatInit {
    CARD32 format;
    CARD8 depth;
} FormatInitRec, *FormatInitPtr;

static int
addFormat(FormatInitRec formats[256], int nformat, CARD32 format, CARD8 depth)
{
    int n;

    for (n = 0; n < nformat; n++)
        if (formats[n].format == format && formats[n].depth == depth)
            return nformat;
    formats[nformat].format = format;
    formats[nformat].depth = depth;
    return ++nformat;
}

#define Mask(n) ((1 << (n)) - 1)

PictFormatPtr
PictureCreateDefaultFormats(ScreenPtr pScreen, int *nformatp)
{
    int nformats, f;
    PictFormatPtr pFormats;
    FormatInitRec formats[1024];
    CARD32 format;
    CARD8 depth;
    VisualPtr pVisual;
    int v;
    int bpp;
    int type;
    int r, g, b;
    int d;
    DepthPtr pDepth;

    nformats = 0;
    /* formats required by protocol */
    formats[nformats].format = PICT_a1;
    formats[nformats].depth = 1;
    nformats++;
    formats[nformats].format = PICT_FORMAT(BitsPerPixel(8),
                                           PICT_TYPE_A, 8, 0, 0, 0);
    formats[nformats].depth = 8;
    nformats++;
    formats[nformats].format = PICT_FORMAT(BitsPerPixel(4),
                                           PICT_TYPE_A, 4, 0, 0, 0);
    formats[nformats].depth = 4;
    nformats++;
    formats[nformats].format = PICT_a8r8g8b8;
    formats[nformats].depth = 32;
    nformats++;
    formats[nformats].format = PICT_x8r8g8b8;
    formats[nformats].depth = 32;
    nformats++;
    formats[nformats].format = PICT_b8g8r8a8;
    formats[nformats].depth = 32;
    nformats++;
    formats[nformats].format = PICT_b8g8r8x8;
    formats[nformats].depth = 32;
    nformats++;

    /* now look through the depths and visuals adding other formats */
    for (v = 0; v < pScreen->numVisuals; v++) {
        pVisual = &pScreen->visuals[v];
        depth = visualDepth(pScreen, pVisual);
        if (!depth)
            continue;
        bpp = BitsPerPixel(depth);
        switch (pVisual->class) {
        case DirectColor:
        case TrueColor:
            r = Ones(pVisual->redMask);
            g = Ones(pVisual->greenMask);
            b = Ones(pVisual->blueMask);
            type = PICT_TYPE_OTHER;
            /*
             * Current rendering code supports only three direct formats,
             * fields must be packed together at the bottom of the pixel
             */
            if (pVisual->offsetBlue == 0 &&
                pVisual->offsetGreen == b && pVisual->offsetRed == b + g) {
                type = PICT_TYPE_ARGB;
            }
            else if (pVisual->offsetRed == 0 &&
                     pVisual->offsetGreen == r &&
                     pVisual->offsetBlue == r + g) {
                type = PICT_TYPE_ABGR;
            }
            else if (pVisual->offsetRed == pVisual->offsetGreen - r &&
                     pVisual->offsetGreen == pVisual->offsetBlue - g &&
                     pVisual->offsetBlue == bpp - b) {
                type = PICT_TYPE_BGRA;
            }
            if (type != PICT_TYPE_OTHER) {
                format = PICT_FORMAT(bpp, type, 0, r, g, b);
                nformats = addFormat(formats, nformats, format, depth);
            }
            break;
        case StaticColor:
        case PseudoColor:
            format = PICT_VISFORMAT(bpp, PICT_TYPE_COLOR, v);
            nformats = addFormat(formats, nformats, format, depth);
            break;
        case StaticGray:
        case GrayScale:
            format = PICT_VISFORMAT(bpp, PICT_TYPE_GRAY, v);
            nformats = addFormat(formats, nformats, format, depth);
            break;
        }
    }
    /*
     * Walk supported depths and add useful Direct formats
     */
    for (d = 0; d < pScreen->numDepths; d++) {
        pDepth = &pScreen->allowedDepths[d];
        bpp = BitsPerPixel(pDepth->depth);
        format = 0;
        switch (bpp) {
        case 16:
            /* depth 12 formats */
            if (pDepth->depth >= 12) {
                nformats = addFormat(formats, nformats,
                                     PICT_x4r4g4b4, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_x4b4g4r4, pDepth->depth);
            }
            /* depth 15 formats */
            if (pDepth->depth >= 15) {
                nformats = addFormat(formats, nformats,
                                     PICT_x1r5g5b5, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_x1b5g5r5, pDepth->depth);
            }
            /* depth 16 formats */
            if (pDepth->depth >= 16) {
                nformats = addFormat(formats, nformats,
                                     PICT_a1r5g5b5, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_a1b5g5r5, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_r5g6b5, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_b5g6r5, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_a4r4g4b4, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_a4b4g4r4, pDepth->depth);
            }
            break;
        case 24:
            if (pDepth->depth >= 24) {
                nformats = addFormat(formats, nformats,
                                     PICT_r8g8b8, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_b8g8r8, pDepth->depth);
            }
            break;
        case 32:
            if (pDepth->depth >= 24) {
                nformats = addFormat(formats, nformats,
                                     PICT_x8r8g8b8, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_x8b8g8r8, pDepth->depth);
            }
            if (pDepth->depth >= 30) {
                nformats = addFormat(formats, nformats,
                                     PICT_a2r10g10b10, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_x2r10g10b10, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_a2b10g10r10, pDepth->depth);
                nformats = addFormat(formats, nformats,
                                     PICT_x2b10g10r10, pDepth->depth);
            }
            break;
        }
    }

    pFormats = calloc(nformats, sizeof(PictFormatRec));
    if (!pFormats)
        return 0;
    for (f = 0; f < nformats; f++) {
        pFormats[f].id = FakeClientID(0);
        pFormats[f].depth = formats[f].depth;
        format = formats[f].format;
        pFormats[f].format = format;
        switch (PICT_FORMAT_TYPE(format)) {
        case PICT_TYPE_ARGB:
            pFormats[f].type = PictTypeDirect;

            pFormats[f].direct.alphaMask = Mask (PICT_FORMAT_A(format));

            if (pFormats[f].direct.alphaMask)
                pFormats[f].direct.alpha = (PICT_FORMAT_R(format) +
                                            PICT_FORMAT_G(format) +
                                            PICT_FORMAT_B(format));

            pFormats[f].direct.redMask = Mask (PICT_FORMAT_R(format));

            pFormats[f].direct.red = (PICT_FORMAT_G(format) +
                                      PICT_FORMAT_B(format));

            pFormats[f].direct.greenMask = Mask (PICT_FORMAT_G(format));

            pFormats[f].direct.green = PICT_FORMAT_B(format);

            pFormats[f].direct.blueMask = Mask (PICT_FORMAT_B(format));

            pFormats[f].direct.blue = 0;
            break;

        case PICT_TYPE_ABGR:
            pFormats[f].type = PictTypeDirect;

            pFormats[f].direct.alphaMask = Mask (PICT_FORMAT_A(format));

            if (pFormats[f].direct.alphaMask)
                pFormats[f].direct.alpha = (PICT_FORMAT_B(format) +
                                            PICT_FORMAT_G(format) +
                                            PICT_FORMAT_R(format));

            pFormats[f].direct.blueMask = Mask (PICT_FORMAT_B(format));

            pFormats[f].direct.blue = (PICT_FORMAT_G(format) +
                                       PICT_FORMAT_R(format));

            pFormats[f].direct.greenMask = Mask (PICT_FORMAT_G(format));

            pFormats[f].direct.green = PICT_FORMAT_R(format);

            pFormats[f].direct.redMask = Mask (PICT_FORMAT_R(format));

            pFormats[f].direct.red = 0;
            break;

        case PICT_TYPE_BGRA:
            pFormats[f].type = PictTypeDirect;

            pFormats[f].direct.blueMask = Mask (PICT_FORMAT_B(format));

            pFormats[f].direct.blue =
                (PICT_FORMAT_BPP(format) - PICT_FORMAT_B(format));

            pFormats[f].direct.greenMask = Mask (PICT_FORMAT_G(format));

            pFormats[f].direct.green =
                (PICT_FORMAT_BPP(format) - PICT_FORMAT_B(format) -
                 PICT_FORMAT_G(format));

            pFormats[f].direct.redMask = Mask (PICT_FORMAT_R(format));

            pFormats[f].direct.red =
                (PICT_FORMAT_BPP(format) - PICT_FORMAT_B(format) -
                 PICT_FORMAT_G(format) - PICT_FORMAT_R(format));

            pFormats[f].direct.alphaMask = Mask (PICT_FORMAT_A(format));

            pFormats[f].direct.alpha = 0;
            break;

        case PICT_TYPE_A:
            pFormats[f].type = PictTypeDirect;

            pFormats[f].direct.alpha = 0;
            pFormats[f].direct.alphaMask = Mask (PICT_FORMAT_A(format));

            /* remaining fields already set to zero */
            break;

        case PICT_TYPE_COLOR:
        case PICT_TYPE_GRAY:
            pFormats[f].type = PictTypeIndexed;
            pFormats[f].index.vid =
                pScreen->visuals[PICT_FORMAT_VIS(format)].vid;
            break;
        }
    }
    *nformatp = nformats;
    return pFormats;
}

static VisualPtr
PictureFindVisual(ScreenPtr pScreen, VisualID visual)
{
    int i;
    VisualPtr pVisual;

    for (i = 0, pVisual = pScreen->visuals;
         i < pScreen->numVisuals; i++, pVisual++) {
        if (pVisual->vid == visual)
            return pVisual;
    }
    return 0;
}

Bool
PictureInitIndexedFormat(ScreenPtr pScreen, PictFormatPtr format)
{
    PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);

    if (format->type != PictTypeIndexed || format->index.pColormap)
        return TRUE;

    if (format->index.vid == pScreen->rootVisual) {
        dixLookupResourceByType((pointer *) &format->index.pColormap,
                                pScreen->defColormap, RT_COLORMAP,
                                serverClient, DixGetAttrAccess);
    }
    else {
        VisualPtr pVisual = PictureFindVisual(pScreen, format->index.vid);

        if (CreateColormap(FakeClientID(0), pScreen, pVisual,
                           &format->index.pColormap, AllocNone, 0)
            != Success)
            return FALSE;
    }
    if (!ps->InitIndexed(pScreen, format))
        return FALSE;
    return TRUE;
}

static Bool
PictureInitIndexedFormats(ScreenPtr pScreen)
{
    PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
    PictFormatPtr format;
    int nformat;

    if (!ps)
        return FALSE;
    format = ps->formats;
    nformat = ps->nformats;
    while (nformat--)
        if (!PictureInitIndexedFormat(pScreen, format++))
            return FALSE;
    return TRUE;
}

Bool
PictureFinishInit(void)
{
    int s;

    for (s = 0; s < screenInfo.numScreens; s++) {
        if (!PictureInitIndexedFormats(screenInfo.screens[s]))
            return FALSE;
        (void) AnimCurInit(screenInfo.screens[s]);
    }

    return TRUE;
}

Bool
PictureSetSubpixelOrder(ScreenPtr pScreen, int subpixel)
{
    PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);

    if (!ps)
        return FALSE;
    ps->subpixel = subpixel;
    return TRUE;

}

int
PictureGetSubpixelOrder(ScreenPtr pScreen)
{
    PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);

    if (!ps)
        return SubPixelUnknown;
    return ps->subpixel;
}

PictFormatPtr
PictureMatchVisual(ScreenPtr pScreen, int depth, VisualPtr pVisual)
{
    PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
    PictFormatPtr format;
    int nformat;
    int type;

    if (!ps)
        return 0;
    format = ps->formats;
    nformat = ps->nformats;
    switch (pVisual->class) {
    case StaticGray:
    case GrayScale:
    case StaticColor:
    case PseudoColor:
        type = PictTypeIndexed;
        break;
    case TrueColor:
    case DirectColor:
        type = PictTypeDirect;
        break;
    default:
        return 0;
    }
    while (nformat--) {
        if (format->depth == depth && format->type == type) {
            if (type == PictTypeIndexed) {
                if (format->index.vid == pVisual->vid)
                    return format;
            }
            else {
                if (format->direct.redMask << format->direct.red ==
                    pVisual->redMask &&
                    format->direct.greenMask << format->direct.green ==
                    pVisual->greenMask &&
                    format->direct.blueMask << format->direct.blue ==
                    pVisual->blueMask) {
                    return format;
                }
            }
        }
        format++;
    }
    return 0;
}

PictFormatPtr
PictureMatchFormat(ScreenPtr pScreen, int depth, CARD32 f)
{
    PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
    PictFormatPtr format;
    int nformat;

    if (!ps)
        return 0;
    format = ps->formats;
    nformat = ps->nformats;
    while (nformat--) {
        if (format->depth == depth && format->format == (f & 0xffffff))
            return format;
        format++;
    }
    return 0;
}

int
PictureParseCmapPolicy(const char *name)
{
    if (strcmp(name, "default") == 0)
        return PictureCmapPolicyDefault;
    else if (strcmp(name, "mono") == 0)
        return PictureCmapPolicyMono;
    else if (strcmp(name, "gray") == 0)
        return PictureCmapPolicyGray;
    else if (strcmp(name, "color") == 0)
        return PictureCmapPolicyColor;
    else if (strcmp(name, "all") == 0)
        return PictureCmapPolicyAll;
    else
        return PictureCmapPolicyInvalid;
}

/** @see GetDefaultBytes */
static void
GetPictureBytes(pointer value, XID id, ResourceSizePtr size)
{
    PicturePtr picture = value;

    /* Currently only pixmap bytes are reported to clients. */
    size->resourceSize = 0;

    size->refCnt = picture->refcnt;

    /* Calculate pixmap reference sizes. */
    size->pixmapRefSize = 0;
    if (picture->pDrawable && (picture->pDrawable->type == DRAWABLE_PIXMAP))
    {
        SizeType pixmapSizeFunc = GetResourceTypeSizeFunc(RT_PIXMAP);
        ResourceSizeRec pixmapSize = { 0, 0, 0 };
        PixmapPtr pixmap = (PixmapPtr)picture->pDrawable;
        pixmapSizeFunc(pixmap, pixmap->drawable.id, &pixmapSize);
        size->pixmapRefSize += pixmapSize.pixmapRefSize;
    }
}

Bool
PictureInit(ScreenPtr pScreen, PictFormatPtr formats, int nformats)
{
    PictureScreenPtr ps;
    int n;
    CARD32 type, a, r, g, b;

    if (PictureGeneration != serverGeneration) {
        PictureType = CreateNewResourceType(FreePicture, "PICTURE");
        if (!PictureType)
            return FALSE;
        SetResourceTypeSizeFunc(PictureType, GetPictureBytes);
        PictFormatType = CreateNewResourceType(FreePictFormat, "PICTFORMAT");
        if (!PictFormatType)
            return FALSE;
        GlyphSetType = CreateNewResourceType(FreeGlyphSet, "GLYPHSET");
        if (!GlyphSetType)
            return FALSE;
        PictureGeneration = serverGeneration;
    }
    if (!dixRegisterPrivateKey(&PictureScreenPrivateKeyRec, PRIVATE_SCREEN, 0))
        return FALSE;

    if (!dixRegisterPrivateKey(&PictureWindowPrivateKeyRec, PRIVATE_WINDOW, 0))
        return FALSE;

    if (!formats) {
        formats = PictureCreateDefaultFormats(pScreen, &nformats);
        if (!formats)
            return FALSE;
    }
    for (n = 0; n < nformats; n++) {
        if (!AddResource
            (formats[n].id, PictFormatType, (pointer) (formats + n))) {
            free(formats);
            return FALSE;
        }
        if (formats[n].type == PictTypeIndexed) {
            VisualPtr pVisual =
                PictureFindVisual(pScreen, formats[n].index.vid);
            if ((pVisual->class | DynamicClass) == PseudoColor)
                type = PICT_TYPE_COLOR;
            else
                type = PICT_TYPE_GRAY;
            a = r = g = b = 0;
        }
        else {
            if ((formats[n].direct.redMask |
                 formats[n].direct.blueMask | formats[n].direct.greenMask) == 0)
                type = PICT_TYPE_A;
            else if (formats[n].direct.red > formats[n].direct.blue)
                type = PICT_TYPE_ARGB;
            else if (formats[n].direct.red == 0)
                type = PICT_TYPE_ABGR;
            else
                type = PICT_TYPE_BGRA;
            a = Ones(formats[n].direct.alphaMask);
            r = Ones(formats[n].direct.redMask);
            g = Ones(formats[n].direct.greenMask);
            b = Ones(formats[n].direct.blueMask);
        }
        formats[n].format = PICT_FORMAT(0, type, a, r, g, b);
    }
    ps = (PictureScreenPtr) malloc(sizeof(PictureScreenRec));
    if (!ps) {
        free(formats);
        return FALSE;
    }
    SetPictureScreen(pScreen, ps);

    ps->formats = formats;
    ps->fallback = formats;
    ps->nformats = nformats;

    ps->filters = 0;
    ps->nfilters = 0;
    ps->filterAliases = 0;
    ps->nfilterAliases = 0;

    ps->subpixel = SubPixelUnknown;

    ps->CloseScreen = pScreen->CloseScreen;
    ps->DestroyWindow = pScreen->DestroyWindow;
    ps->StoreColors = pScreen->StoreColors;
    pScreen->DestroyWindow = PictureDestroyWindow;
    pScreen->CloseScreen = PictureCloseScreen;
    pScreen->StoreColors = PictureStoreColors;

    if (!PictureSetDefaultFilters(pScreen)) {
        PictureResetFilters(pScreen);
        SetPictureScreen(pScreen, 0);
        free(formats);
        free(ps);
        return FALSE;
    }

    return TRUE;
}

void
SetPictureToDefaults(PicturePtr pPicture)
{
    pPicture->refcnt = 1;
    pPicture->repeat = 0;
    pPicture->graphicsExposures = FALSE;
    pPicture->subWindowMode = ClipByChildren;
    pPicture->polyEdge = PolyEdgeSharp;
    pPicture->polyMode = PolyModePrecise;
    pPicture->freeCompClip = FALSE;
    pPicture->clientClipType = CT_NONE;
    pPicture->componentAlpha = FALSE;
    pPicture->repeatType = RepeatNone;

    pPicture->alphaMap = 0;
    pPicture->alphaOrigin.x = 0;
    pPicture->alphaOrigin.y = 0;

    pPicture->clipOrigin.x = 0;
    pPicture->clipOrigin.y = 0;
    pPicture->clientClip = 0;

    pPicture->transform = 0;

    pPicture->filter = PictureGetFilterId(FilterNearest, -1, TRUE);
    pPicture->filter_params = 0;
    pPicture->filter_nparams = 0;

    pPicture->serialNumber = GC_CHANGE_SERIAL_BIT;
    pPicture->stateChanges = -1;
    pPicture->pSourcePict = 0;
}

PicturePtr
CreatePicture(Picture pid,
              DrawablePtr pDrawable,
              PictFormatPtr pFormat,
              Mask vmask, XID *vlist, ClientPtr client, int *error)
{
    PicturePtr pPicture;
    PictureScreenPtr ps = GetPictureScreen(pDrawable->pScreen);

    pPicture = dixAllocateScreenObjectWithPrivates(pDrawable->pScreen,
                                                   PictureRec, PRIVATE_PICTURE);
    if (!pPicture) {
        *error = BadAlloc;
        return 0;
    }

    pPicture->id = pid;
    pPicture->pDrawable = pDrawable;
    pPicture->pFormat = pFormat;
    pPicture->format = pFormat->format | (pDrawable->bitsPerPixel << 24);

    /* security creation/labeling check */
    *error = XaceHook(XACE_RESOURCE_ACCESS, client, pid, PictureType, pPicture,
                      RT_PIXMAP, pDrawable, DixCreateAccess | DixSetAttrAccess);
    if (*error != Success)
        goto out;

    if (pDrawable->type == DRAWABLE_PIXMAP) {
        ++((PixmapPtr) pDrawable)->refcnt;
        pPicture->pNext = 0;
    }
    else {
        pPicture->pNext = GetPictureWindow(((WindowPtr) pDrawable));
        SetPictureWindow(((WindowPtr) pDrawable), pPicture);
    }

    SetPictureToDefaults(pPicture);

    if (vmask)
        *error = ChangePicture(pPicture, vmask, vlist, 0, client);
    else
        *error = Success;
    if (*error == Success)
        *error = (*ps->CreatePicture) (pPicture);
 out:
    if (*error != Success) {
        FreePicture(pPicture, (XID) 0);
        pPicture = 0;
    }
    return pPicture;
}

static CARD32
xRenderColorToCard32(xRenderColor c)
{
    return
        (c.alpha >> 8 << 24) |
        (c.red >> 8 << 16) | (c.green & 0xff00) | (c.blue >> 8);
}

static void
initGradient(SourcePictPtr pGradient, int stopCount,
             xFixed * stopPoints, xRenderColor * stopColors, int *error)
{
    int i;
    xFixed dpos;

    if (stopCount <= 0) {
        *error = BadValue;
        return;
    }

    dpos = -1;
    for (i = 0; i < stopCount; ++i) {
        if (stopPoints[i] < dpos || stopPoints[i] > (1 << 16)) {
            *error = BadValue;
            return;
        }
        dpos = stopPoints[i];
    }

    pGradient->gradient.stops = malloc(stopCount * sizeof(PictGradientStop));
    if (!pGradient->gradient.stops) {
        *error = BadAlloc;
        return;
    }

    pGradient->gradient.nstops = stopCount;

    for (i = 0; i < stopCount; ++i) {
        pGradient->gradient.stops[i].x = stopPoints[i];
        pGradient->gradient.stops[i].color = stopColors[i];
    }
}

static PicturePtr
createSourcePicture(void)
{
    PicturePtr pPicture;

    pPicture = dixAllocateScreenObjectWithPrivates(NULL, PictureRec, PRIVATE_PICTURE);
    pPicture->pDrawable = 0;
    pPicture->pFormat = 0;
    pPicture->pNext = 0;
    pPicture->format = PICT_a8r8g8b8;

    SetPictureToDefaults(pPicture);
    return pPicture;
}

PicturePtr
CreateSolidPicture(Picture pid, xRenderColor * color, int *error)
{
    PicturePtr pPicture;

    pPicture = createSourcePicture();
    if (!pPicture) {
        *error = BadAlloc;
        return 0;
    }

    pPicture->id = pid;
    pPicture->pSourcePict = (SourcePictPtr) malloc(sizeof(PictSolidFill));
    if (!pPicture->pSourcePict) {
        *error = BadAlloc;
        free(pPicture);
        return 0;
    }
    pPicture->pSourcePict->type = SourcePictTypeSolidFill;
    pPicture->pSourcePict->solidFill.color = xRenderColorToCard32(*color);
    return pPicture;
}

PicturePtr
CreateLinearGradientPicture(Picture pid, xPointFixed * p1, xPointFixed * p2,
                            int nStops, xFixed * stops, xRenderColor * colors,
                            int *error)
{
    PicturePtr pPicture;

    if (nStops < 2) {
        *error = BadValue;
        return 0;
    }

    pPicture = createSourcePicture();
    if (!pPicture) {
        *error = BadAlloc;
        return 0;
    }

    pPicture->id = pid;
    pPicture->pSourcePict = (SourcePictPtr) malloc(sizeof(PictLinearGradient));
    if (!pPicture->pSourcePict) {
        *error = BadAlloc;
        free(pPicture);
        return 0;
    }

    pPicture->pSourcePict->linear.type = SourcePictTypeLinear;
    pPicture->pSourcePict->linear.p1 = *p1;
    pPicture->pSourcePict->linear.p2 = *p2;

    initGradient(pPicture->pSourcePict, nStops, stops, colors, error);
    if (*error) {
        free(pPicture);
        return 0;
    }
    return pPicture;
}

PicturePtr
CreateRadialGradientPicture(Picture pid, xPointFixed * inner,
                            xPointFixed * outer, xFixed innerRadius,
                            xFixed outerRadius, int nStops, xFixed * stops,
                            xRenderColor * colors, int *error)
{
    PicturePtr pPicture;
    PictRadialGradient *radial;

    if (nStops < 2) {
        *error = BadValue;
        return 0;
    }

    pPicture = createSourcePicture();
    if (!pPicture) {
        *error = BadAlloc;
        return 0;
    }

    pPicture->id = pid;
    pPicture->pSourcePict = (SourcePictPtr) malloc(sizeof(PictRadialGradient));
    if (!pPicture->pSourcePict) {
        *error = BadAlloc;
        free(pPicture);
        return 0;
    }
    radial = &pPicture->pSourcePict->radial;

    radial->type = SourcePictTypeRadial;
    radial->c1.x = inner->x;
    radial->c1.y = inner->y;
    radial->c1.radius = innerRadius;
    radial->c2.x = outer->x;
    radial->c2.y = outer->y;
    radial->c2.radius = outerRadius;

    initGradient(pPicture->pSourcePict, nStops, stops, colors, error);
    if (*error) {
        free(pPicture);
        return 0;
    }
    return pPicture;
}

PicturePtr
CreateConicalGradientPicture(Picture pid, xPointFixed * center, xFixed angle,
                             int nStops, xFixed * stops, xRenderColor * colors,
                             int *error)
{
    PicturePtr pPicture;

    if (nStops < 2) {
        *error = BadValue;
        return 0;
    }

    pPicture = createSourcePicture();
    if (!pPicture) {
        *error = BadAlloc;
        return 0;
    }

    pPicture->id = pid;
    pPicture->pSourcePict = (SourcePictPtr) malloc(sizeof(PictConicalGradient));
    if (!pPicture->pSourcePict) {
        *error = BadAlloc;
        free(pPicture);
        return 0;
    }

    pPicture->pSourcePict->conical.type = SourcePictTypeConical;
    pPicture->pSourcePict->conical.center = *center;
    pPicture->pSourcePict->conical.angle = angle;

    initGradient(pPicture->pSourcePict, nStops, stops, colors, error);
    if (*error) {
        free(pPicture);
        return 0;
    }
    return pPicture;
}

#define NEXT_VAL(_type) (vlist ? (_type) *vlist++ : (_type) ulist++->val)

#define NEXT_PTR(_type) ((_type) ulist++->ptr)

int
ChangePicture(PicturePtr pPicture,
              Mask vmask, XID *vlist, DevUnion *ulist, ClientPtr client)
{
    ScreenPtr pScreen = pPicture->pDrawable ? pPicture->pDrawable->pScreen : 0;
    PictureScreenPtr ps = pScreen ? GetPictureScreen(pScreen) : 0;
    BITS32 index2;
    int error = 0;
    BITS32 maskQ;

    pPicture->serialNumber |= GC_CHANGE_SERIAL_BIT;
    maskQ = vmask;
    while (vmask && !error) {
        index2 = (BITS32) lowbit(vmask);
        vmask &= ~index2;
        pPicture->stateChanges |= index2;
        switch (index2) {
        case CPRepeat:
        {
            unsigned int newr;
            newr = NEXT_VAL(unsigned int);

            if (newr <= RepeatReflect) {
                pPicture->repeat = (newr != RepeatNone);
                pPicture->repeatType = newr;
            }
            else {
                client->errorValue = newr;
                error = BadValue;
            }
        }
            break;
        case CPAlphaMap:
        {
            PicturePtr pAlpha;

            if (vlist) {
                Picture pid = NEXT_VAL(Picture);

                if (pid == None)
                    pAlpha = 0;
                else {
                    error = dixLookupResourceByType((pointer *) &pAlpha, pid,
                                                    PictureType, client,
                                                    DixReadAccess);
                    if (error != Success) {
                        client->errorValue = pid;
                        break;
                    }
                    if (pAlpha->pDrawable == NULL ||
                        pAlpha->pDrawable->type != DRAWABLE_PIXMAP) {
                        client->errorValue = pid;
                        error = BadMatch;
                        break;
                    }
                }
            }
            else
                pAlpha = NEXT_PTR(PicturePtr);
            if (!error) {
                if (pAlpha && pAlpha->pDrawable->type == DRAWABLE_PIXMAP)
                    pAlpha->refcnt++;
                if (pPicture->alphaMap)
                    FreePicture((pointer) pPicture->alphaMap, (XID) 0);
                pPicture->alphaMap = pAlpha;
            }
        }
            break;
        case CPAlphaXOrigin:
            pPicture->alphaOrigin.x = NEXT_VAL(INT16);

            break;
        case CPAlphaYOrigin:
            pPicture->alphaOrigin.y = NEXT_VAL(INT16);

            break;
        case CPClipXOrigin:
            pPicture->clipOrigin.x = NEXT_VAL(INT16);

            break;
        case CPClipYOrigin:
            pPicture->clipOrigin.y = NEXT_VAL(INT16);

            break;
        case CPClipMask:
        {
            Pixmap pid;
            PixmapPtr pPixmap;
            int clipType;

            if (!pScreen)
                return BadDrawable;

            if (vlist) {
                pid = NEXT_VAL(Pixmap);
                if (pid == None) {
                    clipType = CT_NONE;
                    pPixmap = NullPixmap;
                }
                else {
                    clipType = CT_PIXMAP;
                    error = dixLookupResourceByType((pointer *) &pPixmap, pid,
                                                    RT_PIXMAP, client,
                                                    DixReadAccess);
                    if (error != Success) {
                        client->errorValue = pid;
                        break;
                    }
                }
            }
            else {
                pPixmap = NEXT_PTR(PixmapPtr);

                if (pPixmap)
                    clipType = CT_PIXMAP;
                else
                    clipType = CT_NONE;
            }

            if (pPixmap) {
                if ((pPixmap->drawable.depth != 1) ||
                    (pPixmap->drawable.pScreen != pScreen)) {
                    error = BadMatch;
                    break;
                }
                else {
                    clipType = CT_PIXMAP;
                    pPixmap->refcnt++;
                }
            }
            error = (*ps->ChangePictureClip) (pPicture, clipType,
                                              (pointer) pPixmap, 0);
            break;
        }
        case CPGraphicsExposure:
        {
            unsigned int newe;
            newe = NEXT_VAL(unsigned int);

            if (newe <= xTrue)
                pPicture->graphicsExposures = newe;
            else {
                client->errorValue = newe;
                error = BadValue;
            }
        }
            break;
        case CPSubwindowMode:
        {
            unsigned int news;
            news = NEXT_VAL(unsigned int);

            if (news == ClipByChildren || news == IncludeInferiors)
                pPicture->subWindowMode = news;
            else {
                client->errorValue = news;
                error = BadValue;
            }
        }
            break;
        case CPPolyEdge:
        {
            unsigned int newe;
            newe = NEXT_VAL(unsigned int);

            if (newe == PolyEdgeSharp || newe == PolyEdgeSmooth)
                pPicture->polyEdge = newe;
            else {
                client->errorValue = newe;
                error = BadValue;
            }
        }
            break;
        case CPPolyMode:
        {
            unsigned int newm;
            newm = NEXT_VAL(unsigned int);

            if (newm == PolyModePrecise || newm == PolyModeImprecise)
                pPicture->polyMode = newm;
            else {
                client->errorValue = newm;
                error = BadValue;
            }
        }
            break;
        case CPDither:
            (void) NEXT_VAL(Atom);      /* unimplemented */

            break;
        case CPComponentAlpha:
        {
            unsigned int newca;

            newca = NEXT_VAL(unsigned int);

            if (newca <= xTrue)
                pPicture->componentAlpha = newca;
            else {
                client->errorValue = newca;
                error = BadValue;
            }
        }
            break;
        default:
            client->errorValue = maskQ;
            error = BadValue;
            break;
        }
    }
    if (ps)
        (*ps->ChangePicture) (pPicture, maskQ);
    return error;
}

int
SetPictureClipRects(PicturePtr pPicture,
                    int xOrigin, int yOrigin, int nRect, xRectangle *rects)
{
    ScreenPtr pScreen = pPicture->pDrawable->pScreen;
    PictureScreenPtr ps = GetPictureScreen(pScreen);
    RegionPtr clientClip;
    int result;

    clientClip = RegionFromRects(nRect, rects, CT_UNSORTED);
    if (!clientClip)
        return BadAlloc;
    result = (*ps->ChangePictureClip) (pPicture, CT_REGION,
                                       (pointer) clientClip, 0);
    if (result == Success) {
        pPicture->clipOrigin.x = xOrigin;
        pPicture->clipOrigin.y = yOrigin;
        pPicture->stateChanges |= CPClipXOrigin | CPClipYOrigin | CPClipMask;
        pPicture->serialNumber |= GC_CHANGE_SERIAL_BIT;
    }
    return result;
}

int
SetPictureClipRegion(PicturePtr pPicture,
                     int xOrigin, int yOrigin, RegionPtr pRegion)
{
    ScreenPtr pScreen = pPicture->pDrawable->pScreen;
    PictureScreenPtr ps = GetPictureScreen(pScreen);
    RegionPtr clientClip;
    int result;
    int type;

    if (pRegion) {
        type = CT_REGION;
        clientClip = RegionCreate(RegionExtents(pRegion),
                                  RegionNumRects(pRegion));
        if (!clientClip)
            return BadAlloc;
        if (!RegionCopy(clientClip, pRegion)) {
            RegionDestroy(clientClip);
            return BadAlloc;
        }
    }
    else {
        type = CT_NONE;
        clientClip = 0;
    }

    result = (*ps->ChangePictureClip) (pPicture, type, (pointer) clientClip, 0);
    if (result == Success) {
        pPicture->clipOrigin.x = xOrigin;
        pPicture->clipOrigin.y = yOrigin;
        pPicture->stateChanges |= CPClipXOrigin | CPClipYOrigin | CPClipMask;
        pPicture->serialNumber |= GC_CHANGE_SERIAL_BIT;
    }
    return result;
}

static Bool
transformIsIdentity(PictTransform * t)
{
    return ((t->matrix[0][0] == t->matrix[1][1]) &&
            (t->matrix[0][0] == t->matrix[2][2]) &&
            (t->matrix[0][0] != 0) &&
            (t->matrix[0][1] == 0) &&
            (t->matrix[0][2] == 0) &&
            (t->matrix[1][0] == 0) &&
            (t->matrix[1][2] == 0) &&
            (t->matrix[2][0] == 0) && (t->matrix[2][1] == 0));
}

int
SetPictureTransform(PicturePtr pPicture, PictTransform * transform)
{
    if (transform && transformIsIdentity(transform))
        transform = 0;

    if (transform) {
        if (!pPicture->transform) {
            pPicture->transform =
                (PictTransform *) malloc(sizeof(PictTransform));
            if (!pPicture->transform)
                return BadAlloc;
        }
        *pPicture->transform = *transform;
    }
    else {
        free(pPicture->transform);
        pPicture->transform = NULL;
    }
    pPicture->serialNumber |= GC_CHANGE_SERIAL_BIT;

    if (pPicture->pDrawable != NULL) {
        int result;
        PictureScreenPtr ps = GetPictureScreen(pPicture->pDrawable->pScreen);

        result = (*ps->ChangePictureTransform) (pPicture, transform);

        return result;
    }

    return Success;
}

void
CopyPicture(PicturePtr pSrc, Mask mask, PicturePtr pDst)
{
    PictureScreenPtr ps = GetPictureScreen(pSrc->pDrawable->pScreen);
    Mask origMask = mask;

    pDst->serialNumber |= GC_CHANGE_SERIAL_BIT;
    pDst->stateChanges |= mask;

    while (mask) {
        Mask bit = lowbit(mask);

        switch (bit) {
        case CPRepeat:
            pDst->repeat = pSrc->repeat;
            pDst->repeatType = pSrc->repeatType;
            break;
        case CPAlphaMap:
            if (pSrc->alphaMap &&
                pSrc->alphaMap->pDrawable->type == DRAWABLE_PIXMAP)
                pSrc->alphaMap->refcnt++;
            if (pDst->alphaMap)
                FreePicture((pointer) pDst->alphaMap, (XID) 0);
            pDst->alphaMap = pSrc->alphaMap;
            break;
        case CPAlphaXOrigin:
            pDst->alphaOrigin.x = pSrc->alphaOrigin.x;
            break;
        case CPAlphaYOrigin:
            pDst->alphaOrigin.y = pSrc->alphaOrigin.y;
            break;
        case CPClipXOrigin:
            pDst->clipOrigin.x = pSrc->clipOrigin.x;
            break;
        case CPClipYOrigin:
            pDst->clipOrigin.y = pSrc->clipOrigin.y;
            break;
        case CPClipMask:
            switch (pSrc->clientClipType) {
            case CT_NONE:
                (*ps->ChangePictureClip) (pDst, CT_NONE, NULL, 0);
                break;
            case CT_REGION:
                if (!pSrc->clientClip) {
                    (*ps->ChangePictureClip) (pDst, CT_NONE, NULL, 0);
                }
                else {
                    RegionPtr clientClip;
                    RegionPtr srcClientClip = (RegionPtr) pSrc->clientClip;

                    clientClip = RegionCreate(RegionExtents(srcClientClip),
                                              RegionNumRects(srcClientClip));
                    (*ps->ChangePictureClip) (pDst, CT_REGION, clientClip, 0);
                }
                break;
            default:
                /* XXX: CT_PIXMAP unimplemented */
                break;
            }
            break;
        case CPGraphicsExposure:
            pDst->graphicsExposures = pSrc->graphicsExposures;
            break;
        case CPPolyEdge:
            pDst->polyEdge = pSrc->polyEdge;
            break;
        case CPPolyMode:
            pDst->polyMode = pSrc->polyMode;
            break;
        case CPDither:
            break;
        case CPComponentAlpha:
            pDst->componentAlpha = pSrc->componentAlpha;
            break;
        }
        mask &= ~bit;
    }

    (*ps->ChangePicture) (pDst, origMask);
}

static void
ValidateOnePicture(PicturePtr pPicture)
{
    if (pPicture->pDrawable &&
        pPicture->serialNumber != pPicture->pDrawable->serialNumber) {
        PictureScreenPtr ps = GetPictureScreen(pPicture->pDrawable->pScreen);

        (*ps->ValidatePicture) (pPicture, pPicture->stateChanges);
        pPicture->stateChanges = 0;
        pPicture->serialNumber = pPicture->pDrawable->serialNumber;
    }
}

void
ValidatePicture(PicturePtr pPicture)
{
    ValidateOnePicture(pPicture);
    if (pPicture->alphaMap)
        ValidateOnePicture(pPicture->alphaMap);
}

int
FreePicture(pointer value, XID pid)
{
    PicturePtr pPicture = (PicturePtr) value;

    if (--pPicture->refcnt == 0) {
        free(pPicture->transform);

        if (pPicture->pSourcePict) {
            if (pPicture->pSourcePict->type != SourcePictTypeSolidFill)
                free(pPicture->pSourcePict->linear.stops);

            free(pPicture->pSourcePict);
        }

        if (pPicture->pDrawable) {
            ScreenPtr pScreen = pPicture->pDrawable->pScreen;
            PictureScreenPtr ps = GetPictureScreen(pScreen);

            if (pPicture->alphaMap)
                FreePicture((pointer) pPicture->alphaMap, (XID) 0);
            (*ps->DestroyPicture) (pPicture);
            (*ps->DestroyPictureClip) (pPicture);
            if (pPicture->pDrawable->type == DRAWABLE_WINDOW) {
                WindowPtr pWindow = (WindowPtr) pPicture->pDrawable;
                PicturePtr *pPrev;

                for (pPrev = (PicturePtr *) dixLookupPrivateAddr
                     (&pWindow->devPrivates, PictureWindowPrivateKey);
                     *pPrev; pPrev = &(*pPrev)->pNext) {
                    if (*pPrev == pPicture) {
                        *pPrev = pPicture->pNext;
                        break;
                    }
                }
            }
            else if (pPicture->pDrawable->type == DRAWABLE_PIXMAP) {
                (*pScreen->DestroyPixmap) ((PixmapPtr) pPicture->pDrawable);
            }
        }
        dixFreeObjectWithPrivates(pPicture, PRIVATE_PICTURE);
    }
    return Success;
}

int
FreePictFormat(pointer pPictFormat, XID pid)
{
    return Success;
}

/**
 * ReduceCompositeOp is used to choose simpler ops for cases where alpha
 * channels are always one and so math on the alpha channel per pixel becomes
 * unnecessary.  It may also avoid destination reads sometimes if apps aren't
 * being careful to avoid these cases.
 */
static CARD8
ReduceCompositeOp(CARD8 op, PicturePtr pSrc, PicturePtr pMask, PicturePtr pDst,
                  INT16 xSrc, INT16 ySrc, CARD16 width, CARD16 height)
{
    Bool no_src_alpha, no_dst_alpha;

    /* Sampling off the edge of a RepeatNone picture introduces alpha
     * even if the picture itself doesn't have alpha. We don't try to
     * detect every case where we don't sample off the edge, just the
     * simplest case where there is no transform on the source
     * picture.
     */
    no_src_alpha = PICT_FORMAT_COLOR(pSrc->format) &&
        PICT_FORMAT_A(pSrc->format) == 0 &&
        (pSrc->repeatType != RepeatNone ||
         (!pSrc->transform &&
          xSrc >= 0 && ySrc >= 0 &&
          xSrc + width <= pSrc->pDrawable->width &&
          ySrc + height <= pSrc->pDrawable->height)) &&
        pSrc->alphaMap == NULL && pMask == NULL;
    no_dst_alpha = PICT_FORMAT_COLOR(pDst->format) &&
        PICT_FORMAT_A(pDst->format) == 0 && pDst->alphaMap == NULL;

    /* TODO, maybe: Conjoint and Disjoint op reductions? */

    /* Deal with simplifications where the source alpha is always 1. */
    if (no_src_alpha) {
        switch (op) {
        case PictOpOver:
            op = PictOpSrc;
            break;
        case PictOpInReverse:
            op = PictOpDst;
            break;
        case PictOpOutReverse:
            op = PictOpClear;
            break;
        case PictOpAtop:
            op = PictOpIn;
            break;
        case PictOpAtopReverse:
            op = PictOpOverReverse;
            break;
        case PictOpXor:
            op = PictOpOut;
            break;
        default:
            break;
        }
    }

    /* Deal with simplifications when the destination alpha is always 1 */
    if (no_dst_alpha) {
        switch (op) {
        case PictOpOverReverse:
            op = PictOpDst;
            break;
        case PictOpIn:
            op = PictOpSrc;
            break;
        case PictOpOut:
            op = PictOpClear;
            break;
        case PictOpAtop:
            op = PictOpOver;
            break;
        case PictOpXor:
            op = PictOpOutReverse;
            break;
        default:
            break;
        }
    }

    /* Reduce some con/disjoint ops to the basic names. */
    switch (op) {
    case PictOpDisjointClear:
    case PictOpConjointClear:
        op = PictOpClear;
        break;
    case PictOpDisjointSrc:
    case PictOpConjointSrc:
        op = PictOpSrc;
        break;
    case PictOpDisjointDst:
    case PictOpConjointDst:
        op = PictOpDst;
        break;
    default:
        break;
    }

    return op;
}

void
CompositePicture(CARD8 op,
                 PicturePtr pSrc,
                 PicturePtr pMask,
                 PicturePtr pDst,
                 INT16 xSrc,
                 INT16 ySrc,
                 INT16 xMask,
                 INT16 yMask,
                 INT16 xDst, INT16 yDst, CARD16 width, CARD16 height)
{
    PictureScreenPtr ps = GetPictureScreen(pDst->pDrawable->pScreen);

    ValidatePicture(pSrc);
    if (pMask)
        ValidatePicture(pMask);
    ValidatePicture(pDst);

    op = ReduceCompositeOp(op, pSrc, pMask, pDst, xSrc, ySrc, width, height);
    if (op == PictOpDst)
        return;

    (*ps->Composite) (op,
                      pSrc,
                      pMask,
                      pDst,
                      xSrc, ySrc, xMask, yMask, xDst, yDst, width, height);
}

void
CompositeRects(CARD8 op,
               PicturePtr pDst,
               xRenderColor * color, int nRect, xRectangle *rects)
{
    PictureScreenPtr ps = GetPictureScreen(pDst->pDrawable->pScreen);

    ValidatePicture(pDst);
    (*ps->CompositeRects) (op, pDst, color, nRect, rects);
}

void
CompositeTrapezoids(CARD8 op,
                    PicturePtr pSrc,
                    PicturePtr pDst,
                    PictFormatPtr maskFormat,
                    INT16 xSrc, INT16 ySrc, int ntrap, xTrapezoid * traps)
{
    PictureScreenPtr ps = GetPictureScreen(pDst->pDrawable->pScreen);

    ValidatePicture(pSrc);
    ValidatePicture(pDst);
    (*ps->Trapezoids) (op, pSrc, pDst, maskFormat, xSrc, ySrc, ntrap, traps);
}

void
CompositeTriangles(CARD8 op,
                   PicturePtr pSrc,
                   PicturePtr pDst,
                   PictFormatPtr maskFormat,
                   INT16 xSrc,
                   INT16 ySrc, int ntriangles, xTriangle * triangles)
{
    PictureScreenPtr ps = GetPictureScreen(pDst->pDrawable->pScreen);

    ValidatePicture(pSrc);
    ValidatePicture(pDst);
    (*ps->Triangles) (op, pSrc, pDst, maskFormat, xSrc, ySrc, ntriangles,
                      triangles);
}

void
CompositeTriStrip(CARD8 op,
                  PicturePtr pSrc,
                  PicturePtr pDst,
                  PictFormatPtr maskFormat,
                  INT16 xSrc, INT16 ySrc, int npoints, xPointFixed * points)
{
    PictureScreenPtr ps = GetPictureScreen(pDst->pDrawable->pScreen);

    if (npoints < 3)
        return;

    ValidatePicture(pSrc);
    ValidatePicture(pDst);
    (*ps->TriStrip) (op, pSrc, pDst, maskFormat, xSrc, ySrc, npoints, points);
}

void
CompositeTriFan(CARD8 op,
                PicturePtr pSrc,
                PicturePtr pDst,
                PictFormatPtr maskFormat,
                INT16 xSrc, INT16 ySrc, int npoints, xPointFixed * points)
{
    PictureScreenPtr ps = GetPictureScreen(pDst->pDrawable->pScreen);

    if (npoints < 3)
        return;

    ValidatePicture(pSrc);
    ValidatePicture(pDst);
    (*ps->TriFan) (op, pSrc, pDst, maskFormat, xSrc, ySrc, npoints, points);
}

void
AddTraps(PicturePtr pPicture, INT16 xOff, INT16 yOff, int ntrap, xTrap * traps)
{
    PictureScreenPtr ps = GetPictureScreen(pPicture->pDrawable->pScreen);

    ValidatePicture(pPicture);
    (*ps->AddTraps) (pPicture, xOff, yOff, ntrap, traps);
}