TinyX/render/mipict.c

 /*
  *
  * Copyright © 1999 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 "scrnintstr.h"
#include "gcstruct.h"
#include "pixmapstr.h"
#include "windowstr.h"
#include "mi.h"
#include "picturestr.h"
#include "mipict.h"

#ifndef __GNUC__
#define __inline
#endif

int
miCreatePicture(PicturePtr pPicture)
{
    return Success;
}

void
miDestroyPicture(PicturePtr pPicture)
{
    if (pPicture->freeCompClip)
        REGION_DESTROY(pPicture->pCompositeClip);
}

void
miDestroyPictureClip(PicturePtr pPicture)
{
    switch (pPicture->clientClipType) {
    case CT_NONE:
        return;
    case CT_PIXMAP:
        (*pPicture->pDrawable->pScreen->
         DestroyPixmap) ((PixmapPtr) (pPicture->clientClip));
        break;
    default:
        /*
         * we know we'll never have a list of rectangles, since ChangeClip
         * immediately turns them into a region
         */
        REGION_DESTROY(pPicture->clientClip);
        break;
    }
    pPicture->clientClip = NULL;
    pPicture->clientClipType = CT_NONE;
}

int
miChangePictureClip(PicturePtr pPicture, int type, pointer value, int n)
{
    ScreenPtr pScreen = pPicture->pDrawable->pScreen;

    PictureScreenPtr ps = GetPictureScreen(pScreen);

    pointer clientClip;

    int clientClipType;

    switch (type) {
    case CT_PIXMAP:
        /* convert the pixmap to a region */
        clientClip = (pointer) BITMAP_TO_REGION(pScreen, (PixmapPtr) value);
        if (!clientClip)
            return BadAlloc;
        clientClipType = CT_REGION;
        (*pScreen->DestroyPixmap) ((PixmapPtr) value);
        break;
    case CT_REGION:
        clientClip = value;
        clientClipType = CT_REGION;
        break;
    case CT_NONE:
        clientClip = 0;
        clientClipType = CT_NONE;
        break;
    default:
        clientClip = (pointer) RECTS_TO_REGION(n,
                                               (xRectangle *) value, type);
        if (!clientClip)
            return BadAlloc;
        clientClipType = CT_REGION;
        free(value);
        break;
    }
    (*ps->DestroyPictureClip) (pPicture);
    pPicture->clientClip = clientClip;
    pPicture->clientClipType = clientClipType;
    pPicture->stateChanges |= CPClipMask;
    return Success;
}

void
miChangePicture(PicturePtr pPicture, Mask mask)
{
    return;
}

void
miValidatePicture(PicturePtr pPicture, Mask mask)
{
    DrawablePtr pDrawable = pPicture->pDrawable;

    if ((mask & (CPClipXOrigin | CPClipYOrigin | CPClipMask | CPSubwindowMode))
        || (pDrawable->serialNumber !=
            (pPicture->serialNumber & DRAWABLE_SERIAL_BITS))) {
        if (pDrawable->type == DRAWABLE_WINDOW) {
            WindowPtr pWin = (WindowPtr) pDrawable;

            RegionPtr pregWin;

            Bool freeTmpClip, freeCompClip;

            if (pPicture->subWindowMode == IncludeInferiors) {
                pregWin = NotClippedByChildren(pWin);
                freeTmpClip = TRUE;
            }
            else {
                pregWin = &pWin->clipList;
                freeTmpClip = FALSE;
            }
            freeCompClip = pPicture->freeCompClip;

            /*
             * if there is no client clip, we can get by with just keeping the
             * pointer we got, and remembering whether or not should destroy
             * (or maybe re-use) it later.  this way, we avoid unnecessary
             * copying of regions.  (this wins especially if many clients clip
             * by children and have no client clip.)
             */
            if (pPicture->clientClipType == CT_NONE) {
                if (freeCompClip)
                    REGION_DESTROY(pPicture->pCompositeClip);
                pPicture->pCompositeClip = pregWin;
                pPicture->freeCompClip = freeTmpClip;
            }
            else {
                /*
                 * we need one 'real' region to put into the composite clip. if
                 * pregWin the current composite clip are real, we can get rid of
                 * one. if pregWin is real and the current composite clip isn't,
                 * use pregWin for the composite clip. if the current composite
                 * clip is real and pregWin isn't, use the current composite
                 * clip. if neither is real, create a new region.
                 */

                REGION_TRANSLATE(pPicture->clientClip,
                                 pDrawable->x + pPicture->clipOrigin.x,
                                 pDrawable->y + pPicture->clipOrigin.y);

                if (freeCompClip) {
                    REGION_INTERSECT(pPicture->pCompositeClip,
                                     pregWin, pPicture->clientClip);
                    if (freeTmpClip)
                        REGION_DESTROY(pregWin);
                }
                else if (freeTmpClip) {
                    REGION_INTERSECT(pregWin, pregWin,
                                     pPicture->clientClip);
                    pPicture->pCompositeClip = pregWin;
                }
                else {
                    pPicture->pCompositeClip =
                        REGION_CREATE(NullBox, 0);
                    REGION_INTERSECT(pPicture->pCompositeClip, pregWin,
                                     pPicture->clientClip);
                }
                pPicture->freeCompClip = TRUE;
                REGION_TRANSLATE(pPicture->clientClip,
                                 -(pDrawable->x + pPicture->clipOrigin.x),
                                 -(pDrawable->y + pPicture->clipOrigin.y));
            }
        }                       /* end of composite clip for a window */
        else {
            BoxRec pixbounds;

            /* XXX should we translate by drawable.x/y here ? */
            /* If you want pixmaps in offscreen memory, yes */
            pixbounds.x1 = pDrawable->x;
            pixbounds.y1 = pDrawable->y;
            pixbounds.x2 = pDrawable->x + pDrawable->width;
            pixbounds.y2 = pDrawable->y + pDrawable->height;

            if (pPicture->freeCompClip) {
                REGION_RESET(pPicture->pCompositeClip, &pixbounds);
            }
            else {
                pPicture->freeCompClip = TRUE;
                pPicture->pCompositeClip =
                    REGION_CREATE(&pixbounds, 1);
            }

            if (pPicture->clientClipType == CT_REGION) {
                if (pDrawable->x || pDrawable->y) {
                    REGION_TRANSLATE(pPicture->clientClip,
                                     pDrawable->x + pPicture->clipOrigin.x,
                                     pDrawable->y + pPicture->clipOrigin.y);
                    REGION_INTERSECT(pPicture->pCompositeClip,
                                     pPicture->pCompositeClip,
                                     pPicture->clientClip);
                    REGION_TRANSLATE(pPicture->clientClip,
                                     -(pDrawable->x + pPicture->clipOrigin.x),
                                     -(pDrawable->y + pPicture->clipOrigin.y));
                }
                else {
                    REGION_TRANSLATE(pPicture->pCompositeClip,
                                     -pPicture->clipOrigin.x,
                                     -pPicture->clipOrigin.y);
                    REGION_INTERSECT(pPicture->pCompositeClip,
                                     pPicture->pCompositeClip,
                                     pPicture->clientClip);
                    REGION_TRANSLATE(pPicture->pCompositeClip,
                                     pPicture->clipOrigin.x,
                                     pPicture->clipOrigin.y);
                }
            }
        }                       /* end of composite clip for pixmap */
    }
}

int
miChangePictureTransform(PicturePtr pPicture, PictTransform * transform)
{
    return Success;
}

int
miChangePictureFilter(PicturePtr pPicture,
                      int filter, xFixed * params, int nparams)
{
    return Success;
}

#define BOUND(v)	(INT16) ((v) < MINSHORT ? MINSHORT : (v) > MAXSHORT ? MAXSHORT : (v))

static __inline Bool
miClipPictureReg(RegionPtr pRegion, RegionPtr pClip, int dx, int dy)
{
    if (REGION_NUM_RECTS(pRegion) == 1 && REGION_NUM_RECTS(pClip) == 1) {
        BoxPtr pRbox = REGION_RECTS(pRegion);

        BoxPtr pCbox = REGION_RECTS(pClip);

        int v;

        if (pRbox->x1 < (v = pCbox->x1 + dx))
            pRbox->x1 = BOUND(v);
        if (pRbox->x2 > (v = pCbox->x2 + dx))
            pRbox->x2 = BOUND(v);
        if (pRbox->y1 < (v = pCbox->y1 + dy))
            pRbox->y1 = BOUND(v);
        if (pRbox->y2 > (v = pCbox->y2 + dy))
            pRbox->y2 = BOUND(v);
        if (pRbox->x1 >= pRbox->x2 || pRbox->y1 >= pRbox->y2) {
            REGION_EMPTY(pRegion);
        }
    }
    else if (!REGION_NOTEMPTY(pClip))
        return FALSE;
    else {
        if (dx || dy)
            REGION_TRANSLATE(pRegion, -dx, -dy);
        if (!REGION_INTERSECT(pRegion, pRegion, pClip))
            return FALSE;
        if (dx || dy)
            REGION_TRANSLATE(pRegion, dx, dy);
    }
    return REGION_NOTEMPTY(pRegion);
}

static __inline Bool
miClipPictureSrc(RegionPtr pRegion, PicturePtr pPicture, int dx, int dy)
{
    /* XXX what to do with clipping from transformed pictures? */
    if (pPicture->transform || !pPicture->pDrawable)
        return TRUE;
    if (pPicture->repeat) {
        if (pPicture->clientClipType != CT_NONE) {
            REGION_TRANSLATE(pRegion,
                             dx - pPicture->clipOrigin.x,
                             dy - pPicture->clipOrigin.y);
            if (!REGION_INTERSECT(pRegion, pRegion,
                                  (RegionPtr) pPicture->clientClip))
                return FALSE;
            REGION_TRANSLATE(pRegion,
                             -(dx - pPicture->clipOrigin.x),
                             -(dy - pPicture->clipOrigin.y));
        }
        return TRUE;
    }
    else {
        return miClipPictureReg(pRegion, pPicture->pCompositeClip, dx, dy);
    }
}

static void
miCompositeSourceValidate(PicturePtr pPicture,
                          INT16 x, INT16 y, CARD16 width, CARD16 height)
{
    DrawablePtr pDrawable = pPicture->pDrawable;

    ScreenPtr pScreen;

    if (!pDrawable)
        return;

    pScreen = pDrawable->pScreen;

    if (pScreen->SourceValidate) {
        x -= pPicture->pDrawable->x;
        y -= pPicture->pDrawable->y;
        if (pPicture->transform) {
            xPoint points[4];

            int i;

            int xmin, ymin, xmax, ymax;

#define VectorSet(i,_x,_y) { points[i].x = _x; points[i].y = _y; }
            VectorSet(0, x, y);
            VectorSet(1, x + width, y);
            VectorSet(2, x, y + height);
            VectorSet(3, x + width, y + height);
            xmin = ymin = 32767;
            xmax = ymax = -32737;
            for (i = 0; i < 4; i++) {
                PictVector t;

                t.vector[0] = IntToxFixed(points[i].x);
                t.vector[1] = IntToxFixed(points[i].y);
                t.vector[2] = xFixed1;
                if (PictureTransformPoint(pPicture->transform, &t)) {
                    int tx = xFixedToInt(t.vector[0]);

                    int ty = xFixedToInt(t.vector[1]);

                    if (tx < xmin)
                        xmin = tx;
                    if (tx > xmax)
                        xmax = tx;
                    if (ty < ymin)
                        ymin = ty;
                    if (ty > ymax)
                        ymax = ty;
                }
            }
            x = xmin;
            y = ymin;
            width = xmax - xmin;
            height = ymax - ymin;
        }
        (*pScreen->SourceValidate) (pDrawable, x, y, width, height);
    }
}

/*
 * returns FALSE if the final region is empty.  Indistinguishable from
 * an allocation failure, but rendering ignores those anyways.
 */

_X_EXPORT Bool
miComputeCompositeRegion(RegionPtr pRegion,
                         PicturePtr pSrc,
                         PicturePtr pMask,
                         PicturePtr pDst,
                         INT16 xSrc,
                         INT16 ySrc,
                         INT16 xMask,
                         INT16 yMask,
                         INT16 xDst, INT16 yDst, CARD16 width, CARD16 height)
{
    int v;

    pRegion->extents.x1 = xDst;
    v = xDst + width;
    pRegion->extents.x2 = BOUND(v);
    pRegion->extents.y1 = yDst;
    v = yDst + height;
    pRegion->extents.y2 = BOUND(v);
    pRegion->data = 0;
    /* Check for empty operation */
    if (pRegion->extents.x1 >= pRegion->extents.x2 ||
        pRegion->extents.y1 >= pRegion->extents.y2) {
        REGION_EMPTY(pRegion);
        return FALSE;
    }
    /* clip against dst */
    if (!miClipPictureReg(pRegion, pDst->pCompositeClip, 0, 0)) {
        REGION_UNINIT(pRegion);
        return FALSE;
    }
    if (pDst->alphaMap) {
        if (!miClipPictureReg(pRegion, pDst->alphaMap->pCompositeClip,
                              -pDst->alphaOrigin.x, -pDst->alphaOrigin.y)) {
            REGION_UNINIT(pRegion);
            return FALSE;
        }
    }
    /* clip against src */
    if (!miClipPictureSrc(pRegion, pSrc, xDst - xSrc, yDst - ySrc)) {
        REGION_UNINIT(pRegion);
        return FALSE;
    }
    if (pSrc->alphaMap) {
        if (!miClipPictureSrc(pRegion, pSrc->alphaMap,
                              xDst - (xSrc + pSrc->alphaOrigin.x),
                              yDst - (ySrc + pSrc->alphaOrigin.y))) {
            REGION_UNINIT(pRegion);
            return FALSE;
        }
    }
    /* clip against mask */
    if (pMask) {
        if (!miClipPictureSrc(pRegion, pMask, xDst - xMask, yDst - yMask)) {
            REGION_UNINIT(pRegion);
            return FALSE;
        }
        if (pMask->alphaMap) {
            if (!miClipPictureSrc(pRegion, pMask->alphaMap,
                                  xDst - (xMask + pMask->alphaOrigin.x),
                                  yDst - (yMask + pMask->alphaOrigin.y))) {
                REGION_UNINIT(pRegion);
                return FALSE;
            }
        }
    }
    miCompositeSourceValidate(pSrc, xSrc, ySrc, width, height);
    if (pMask)
        miCompositeSourceValidate(pMask, xMask, yMask, width, height);
    return TRUE;
}

void
miRenderColorToPixel(PictFormatPtr format, xRenderColor * color, CARD32 *pixel)
{
    CARD32 r, g, b, a;

    miIndexedPtr pIndexed;

    switch (format->type) {
    case PictTypeDirect:
        r = color->red >> (16 - Ones(format->direct.redMask));
        g = color->green >> (16 - Ones(format->direct.greenMask));
        b = color->blue >> (16 - Ones(format->direct.blueMask));
        a = color->alpha >> (16 - Ones(format->direct.alphaMask));
        r = r << format->direct.red;
        g = g << format->direct.green;
        b = b << format->direct.blue;
        a = a << format->direct.alpha;
        *pixel = r | g | b | a;
        break;
    case PictTypeIndexed:
        pIndexed = (miIndexedPtr) (format->index.devPrivate);
        if (pIndexed->color) {
            r = color->red >> 11;
            g = color->green >> 11;
            b = color->blue >> 11;
            *pixel = miIndexToEnt15(pIndexed, (r << 10) | (g << 5) | b);
        }
        else {
            r = color->red >> 8;
            g = color->green >> 8;
            b = color->blue >> 8;
            *pixel = miIndexToEntY24(pIndexed, (r << 16) | (g << 8) | b);
        }
        break;
    }
}

static CARD16
miFillColor(CARD32 pixel, int bits)
{
    while (bits < 16) {
        pixel |= pixel << bits;
        bits <<= 1;
    }
    return (CARD16) pixel;
}

Bool
miIsSolidAlpha(PicturePtr pSrc)
{
    ScreenPtr pScreen;

    char line[1];

    if (!pSrc->pDrawable)
        return FALSE;

    pScreen = pSrc->pDrawable->pScreen;

    /* Alpha-only */
    if (PICT_FORMAT_TYPE(pSrc->format) != PICT_TYPE_A)
        return FALSE;
    /* repeat */
    if (!pSrc->repeat)
        return FALSE;
    /* 1x1 */
    if (pSrc->pDrawable->width != 1 || pSrc->pDrawable->height != 1)
        return FALSE;
    line[0] = 1;
    (*pScreen->GetImage) (pSrc->pDrawable, 0, 0, 1, 1, ZPixmap, ~0L, line);
    switch (pSrc->pDrawable->bitsPerPixel) {
    case 1:
        return (CARD8) line[0] == 1 || (CARD8) line[0] == 0x80;
    case 4:
        return (CARD8) line[0] == 0xf || (CARD8) line[0] == 0xf0;
    case 8:
        return (CARD8) line[0] == 0xff;
    default:
        return FALSE;
    }
}

void
miRenderPixelToColor(PictFormatPtr format, CARD32 pixel, xRenderColor * color)
{
    CARD32 r, g, b, a;

    miIndexedPtr pIndexed;

    switch (format->type) {
    case PictTypeDirect:
        r = (pixel >> format->direct.red) & format->direct.redMask;
        g = (pixel >> format->direct.green) & format->direct.greenMask;
        b = (pixel >> format->direct.blue) & format->direct.blueMask;
        a = (pixel >> format->direct.alpha) & format->direct.alphaMask;
        color->red = miFillColor(r, Ones(format->direct.redMask));
        color->green = miFillColor(g, Ones(format->direct.greenMask));
        color->blue = miFillColor(b, Ones(format->direct.blueMask));
        color->alpha = miFillColor(a, Ones(format->direct.alphaMask));
        break;
    case PictTypeIndexed:
        pIndexed = (miIndexedPtr) (format->index.devPrivate);
        pixel = pIndexed->rgba[pixel & (MI_MAX_INDEXED - 1)];
        r = (pixel >> 16) & 0xff;
        g = (pixel >> 8) & 0xff;
        b = (pixel) & 0xff;
        color->red = miFillColor(r, 8);
        color->green = miFillColor(g, 8);
        color->blue = miFillColor(b, 8);
        color->alpha = 0xffff;
        break;
    }
}

_X_EXPORT Bool
miPictureInit(ScreenPtr pScreen, PictFormatPtr formats, int nformats)
{
    PictureScreenPtr ps;

    if (!PictureInit(pScreen, formats, nformats))
        return FALSE;
    ps = GetPictureScreen(pScreen);
    ps->CreatePicture = miCreatePicture;
    ps->DestroyPicture = miDestroyPicture;
    ps->ChangePictureClip = miChangePictureClip;
    ps->DestroyPictureClip = miDestroyPictureClip;
    ps->ChangePicture = miChangePicture;
    ps->ValidatePicture = miValidatePicture;
    ps->InitIndexed = miInitIndexed;
    ps->CloseIndexed = miCloseIndexed;
    ps->UpdateIndexed = miUpdateIndexed;
    ps->ChangePictureTransform = miChangePictureTransform;
    ps->ChangePictureFilter = miChangePictureFilter;
    ps->RealizeGlyph = miRealizeGlyph;
    ps->UnrealizeGlyph = miUnrealizeGlyph;

    /* MI rendering routines */
    ps->Composite = 0;          /* requires DDX support */
    ps->Glyphs = miGlyphs;
    ps->CompositeRects = miCompositeRects;
    ps->Trapezoids = miTrapezoids;
    ps->Triangles = miTriangles;
    ps->TriStrip = miTriStrip;
    ps->TriFan = miTriFan;

    ps->RasterizeTrapezoid = 0; /* requires DDX support */
    ps->AddTraps = 0;           /* requires DDX support */
    ps->AddTriangles = 0;       /* requires DDX support */

    return TRUE;
}