qpixmap_x11.cpp

奇趣公司比较新的qt/emd版本

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**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
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** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
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// Uncomment the next line to enable the MIT Shared Memory extension
//
// WARNING:  This has some problems:
//
//    1. Consumes a 800x600 pixmap
//    2. Qt does not handle the ShmCompletion message, so you will
//        get strange effects if you xForm() repeatedly.
//
// #define QT_MITSHM

#if defined(Q_OS_WIN32) && defined(QT_MITSHM)
#undef QT_MITSHM
#endif

#include "qplatformdefs.h"

#include "qdebug.h"
#include "qiodevice.h"
#include "qpixmap_p.h"
#include "qbitmap.h"
#include "qcolormap.h"
#include "qimage.h"
#include "qmatrix.h"
#include "qapplication.h"
#include <private/qpaintengine_x11_p.h>
#include <private/qt_x11_p.h>
#include "qx11info_x11.h"
#include <private/qdrawhelper_p.h>

#include <stdlib.h>

#if defined(Q_CC_MIPS)
#  define for if(0){}else for
#endif

// For thread-safety:
//   image->data does not belong to X11, so we must free it ourselves.

inline static void qSafeXDestroyImage(XImage *x)
{
    if (x->data) {
        free(x->data);
        x->data = 0;
    }
    XDestroyImage(x);
}

QBitmap QPixmapData::mask_to_bitmap(int screen) const
{
    if (!x11_mask)
        return QBitmap();
    QPixmap::x11SetDefaultScreen(screen);
    QBitmap bm(w, h);
    GC gc = XCreateGC(X11->display, bm.data->hd, 0, 0);
    XCopyArea(X11->display, x11_mask, bm.data->hd, gc, 0, 0, bm.data->w, bm.data->h, 0, 0);
    XFreeGC(X11->display, gc);
    return bm;
}

Qt::HANDLE QPixmapData::bitmap_to_mask(const QBitmap &bitmap, int screen)
{
    if (bitmap.isNull())
        return 0;
    QBitmap bm = bitmap;
    bm.x11SetScreen(screen);

    Pixmap mask = XCreatePixmap(X11->display, RootWindow(X11->display, screen),
                                bm.data->w, bm.data->h, 1);
    GC gc = XCreateGC(X11->display, mask, 0, 0);
    XCopyArea(X11->display, bm.data->hd, mask, gc, 0, 0, bm.data->w, bm.data->h, 0, 0);
    XFreeGC(X11->display, gc);
    return mask;
}


/*****************************************************************************
  MIT Shared Memory Extension support: makes xForm noticeably (~20%) faster.
 *****************************************************************************/

#if defined(QT_MITSHM)

static bool               xshminit = false;
static XShmSegmentInfo xshminfo;
static XImage              *xshmimg = 0;
static Pixmap               xshmpm  = 0;

static void qt_cleanup_mitshm()
{
    if (xshmimg == 0)
        return;
    Display *dpy = QX11Info::appDisplay();
    if (xshmpm) {
        XFreePixmap(dpy, xshmpm);
        xshmpm = 0;
    }
    XShmDetach(dpy, &xshminfo); xshmimg->data = 0;
    qSafeXDestroyImage(xshmimg); xshmimg = 0;
    shmdt(xshminfo.shmaddr);
    shmctl(xshminfo.shmid, IPC_RMID, 0);
}

static bool qt_create_mitshm_buffer(const QPaintDevice* dev, int w, int h)
{
    static int major, minor;
    static Bool pixmaps_ok;
    Display *dpy = dev->data->xinfo->display();
    int dd         = dev->x11Depth();
    Visual *vis         = (Visual*)dev->x11Visual();

    if (xshminit) {
        qt_cleanup_mitshm();
    } else {
        if (!XShmQueryVersion(dpy, &major, &minor, &pixmaps_ok))
            return false;                        // MIT Shm not supported
        qAddPostRoutine(qt_cleanup_mitshm);
        xshminit = true;
    }

    xshmimg = XShmCreateImage(dpy, vis, dd, ZPixmap, 0, &xshminfo, w, h);
    if (!xshmimg)
        return false;

    bool ok;
    xshminfo.shmid = shmget(IPC_PRIVATE,
                             xshmimg->bytes_per_line * xshmimg->height,
                             IPC_CREAT | 0777);
    ok = xshminfo.shmid != -1;
    if (ok) {
        xshmimg->data = (char*)shmat(xshminfo.shmid, 0, 0);
        xshminfo.shmaddr = xshmimg->data;
        ok = (xshminfo.shmaddr != (char*)-1);
    }
    xshminfo.readOnly = false;
    if (ok)
        ok = XShmAttach(dpy, &xshminfo);
    if (!ok) {
        qSafeXDestroyImage(xshmimg);
        xshmimg = 0;
        if (xshminfo.shmaddr)
            shmdt(xshminfo.shmaddr);
        if (xshminfo.shmid != -1)
            shmctl(xshminfo.shmid, IPC_RMID, 0);
        return false;
    }
    if (pixmaps_ok)
        xshmpm = XShmCreatePixmap(dpy, DefaultRootWindow(dpy), xshmimg->data,
                                   &xshminfo, w, h, dd);

    return true;
}

#else

// If extern, need a dummy.
//
// static bool qt_create_mitshm_buffer(QPaintDevice*, int, int)
// {
//     return false;
// }

#endif // QT_MITSHM


/*****************************************************************************
  Internal functions
 *****************************************************************************/

extern const uchar *qt_get_bitflip_array();                // defined in qimage.cpp

// Returns position of highest bit set or -1 if none
static int highest_bit(uint v)
{
    int i;
    uint b = (uint)1 << 31;
    for (i=31; ((b & v) == 0) && i>=0;         i--)
        b >>= 1;
    return i;
}

// Returns position of lowest set bit in 'v' as an integer (0-31), or -1
static int lowest_bit(uint v)
{
    int i;
    ulong lb;
    lb = 1;
    for (i=0; ((v & lb) == 0) && i<32;  i++, lb<<=1);
    return i==32 ? -1 : i;
}

// Counts the number of bits set in 'v'
static uint n_bits(uint v)
{
    int i = 0;
    while (v) {
        v = v & (v - 1);
        i++;
    }
    return i;
}

static uint *red_scale_table   = 0;
static uint *green_scale_table = 0;
static uint *blue_scale_table  = 0;

static void cleanup_scale_tables()
{
    delete[] red_scale_table;
    delete[] green_scale_table;
    delete[] blue_scale_table;
}

/*
  Could do smart bitshifting, but the "obvious" algorithm only works for
  nBits >= 4. This is more robust.
*/
static void build_scale_table(uint **table, uint nBits)
{
    if (nBits > 7) {
        qWarning("build_scale_table: internal error, nBits = %i", nBits);
        return;
    }
    if (!*table) {
        static bool firstTable = true;
        if (firstTable) {
            qAddPostRoutine(cleanup_scale_tables);
            firstTable = false;
        }
        *table = new uint[256];
    }
    int   maxVal   = (1 << nBits) - 1;
    int   valShift = 8 - nBits;
    int i;
    for(i = 0 ; i < maxVal + 1 ; i++)
        (*table)[i << valShift] = i*255/maxVal;
}

static int defaultScreen = -1;

/*****************************************************************************
  QPixmap member functions
 *****************************************************************************/

static int qt_pixmap_serial = 0;
int Q_GUI_EXPORT qt_x11_preferred_pixmap_depth = 0;

/*!
  \internal
  Initializes the pixmap data.
*/
void QPixmap::init(int w, int h, Type type)
{
    if (!qApp) {
        qFatal("QPixmap: Must construct a QApplication before a QPaintDevice");
        return;
    }

    if (qApp->type() == QApplication::Tty) {
        qWarning("QPixmap: Cannot create a QPixmap when no GUI is being used");
    }

    data = new QPixmapData;
    memset(data, 0, sizeof(QPixmapData));
    data->type = type;
    data->count  = 1;
    data->uninit = true;
    data->ser_no = ++qt_pixmap_serial;
    data->detach_no = 0;
    data->picture = 0;
    data->x11_mask = 0;
    data->mask_picture = 0;

    if (defaultScreen >= 0 && defaultScreen != data->xinfo.screen()) {
        QX11InfoData* xd = data->xinfo.getX11Data(true);
        xd->screen = defaultScreen;
        xd->depth = QX11Info::appDepth(xd->screen);
        xd->cells = QX11Info::appCells(xd->screen);
        xd->colormap = QX11Info::appColormap(xd->screen);
        xd->defaultColormap = QX11Info::appDefaultColormap(xd->screen);
        xd->visual = (Visual *)QX11Info::appVisual(xd->screen);
        xd->defaultVisual = QX11Info::appDefaultVisual(xd->screen);
        data->xinfo.setX11Data(xd);
    }

    int dd = data->xinfo.depth();

    if (qt_x11_preferred_pixmap_depth)
        dd = qt_x11_preferred_pixmap_depth;

    bool make_null = w == 0 || h == 0;                // create null pixmap
    data->d = (type == PixmapType) ? dd : 1;
    if (make_null || w < 0 || h < 0 || data->d == 0) {
        data->hd = 0;
        data->picture = 0;
        if (!make_null)
            qWarning("QPixmap: Invalid pixmap parameters");
        return;
    }
    data->w = w;
    data->h = h;
    data->hd = (Qt::HANDLE)XCreatePixmap(X11->display,
                                         RootWindow(X11->display,
                                                    data->xinfo.screen()),
                                         w, h, data->d);
#ifndef QT_NO_XRENDER
    if (X11->use_xrender) {
        XRenderPictFormat *format = data->d == 1
                                    ? XRenderFindStandardFormat(X11->display, PictStandardA1)
                                    : XRenderFindVisualFormat(X11->display, (Visual *) data->xinfo.visual());
        data->picture = XRenderCreatePicture(X11->display, data->hd, format, 0, 0);
    }
#endif // QT_NO_XRENDER
}

QPixmapData::~QPixmapData()
{
    if (!qApp)
        return;
    if (x11_mask) {
#ifndef QT_NO_XRENDER
        if (mask_picture)
            XRenderFreePicture(X11->display, mask_picture);
        mask_picture = 0;
#endif
        XFreePixmap(X11->display, x11_mask);
        x11_mask = 0;
    }
    if (hd) {

#ifndef QT_NO_XRENDER
        if (picture) {