qpaintengine_x11.cpp

奇趣公司比较新的qt/emd版本

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at [e-mail].
**
** In addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.0, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** In addition, as a special exception, Trolltech, as the sole copyright
** holder for Qt Designer, grants users of the Qt/Eclipse Integration
** plug-in the right for the Qt/Eclipse Integration to link to
** functionality provided by Qt Designer and its related libraries.
**
** Trolltech reserves all rights not expressly granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qplatformdefs.h"

#include "private/qpixmap_p.h"

#include "qapplication.h"
#include "qdebug.h"
#include "qfont.h"
#include "qwidget.h"
#include "qbitmap.h"
#include "qpixmapcache.h"
#include "qtextcodec.h"
#include "qcoreevent.h"
#include "qiodevice.h"

#include "qpainter_p.h"
#include <qtextlayout.h>
#include <qvarlengtharray.h>
#include <private/qfont_p.h>
#include <private/qtextengine_p.h>
#include <private/qpaintengine_x11_p.h>
#include <private/qfontengine_x11_p.h>

#include "qpen.h"
#include "qcolor.h"
#include "qcolormap.h"

#include "qmath_p.h"

#include <private/qpaintengine_p.h>
#include "qpaintengine_x11_p.h"

#include <private/qt_x11_p.h>
#include <private/qnumeric_p.h>
#include <limits.h>

#ifndef QT_NO_XRENDER
#include <private/qtessellator_p.h>
#endif

extern Drawable qt_x11Handle(const QPaintDevice *pd);
extern const QX11Info *qt_x11Info(const QPaintDevice *pd);
extern QPixmap qt_pixmapForBrush(int brushStyle, bool invert); //in qbrush.cpp

#undef X11 // defined in qt_x11_p.h
/*!
    Returns the X11 specific pen GC for the painter \a p. Note that
    QPainter::begin() must be called before this function returns a
    valid GC.
*/
Q_GUI_EXPORT GC qt_x11_get_pen_gc(QPainter *p)
{
    if (p && p->paintEngine()
        && p->paintEngine()->isActive()
        && p->paintEngine()->type() == QPaintEngine::X11) {
        return static_cast<QX11PaintEngine *>(p->paintEngine())->d_func()->gc;
    }
    return 0;
}

/*!
    Returns the X11 specific brush GC for the painter \a p. Note that
    QPainter::begin() must be called before this function returns a
    valid GC.
*/
Q_GUI_EXPORT GC qt_x11_get_brush_gc(QPainter *p)
{
    if (p && p->paintEngine()
        && p->paintEngine()->isActive()
        && p->paintEngine()->type() == QPaintEngine::X11) {
        return static_cast<QX11PaintEngine *>(p->paintEngine())->d_func()->gc_brush;
    }
    return 0;
}
#define X11 qt_x11Data

#ifndef QT_NO_XRENDER
static const int compositionModeToRenderOp[QPainter::CompositionMode_Xor + 1] = {
    PictOpOver, //CompositionMode_SourceOver,
    PictOpOverReverse, //CompositionMode_DestinationOver,
    PictOpClear, //CompositionMode_Clear,
    PictOpSrc, //CompositionMode_Source,
    PictOpDst, //CompositionMode_Destination,
    PictOpIn, //CompositionMode_SourceIn,
    PictOpInReverse, //CompositionMode_DestinationIn,
    PictOpOut, //CompositionMode_SourceOut,
    PictOpOutReverse, //CompositionMode_DestinationOut,
    PictOpAtop, //CompositionMode_SourceAtop,
    PictOpAtopReverse, //CompositionMode_DestinationAtop,
    PictOpXor //CompositionMode_Xor
};

static inline int qpainterOpToXrender(QPainter::CompositionMode mode)
{
    Q_ASSERT(mode <= QPainter::CompositionMode_Xor);
    return compositionModeToRenderOp[mode];
}
#endif

// hack, so we don't have to make QRegion::clipRectangles() public or include
// X11 headers in qregion.h
void *qt_getClipRects(const QRegion &r, int &num)
{
    return r.clipRectangles(num);
}

static inline void x11SetClipRegion(Display *dpy, GC gc, GC gc2,
#ifndef QT_NO_XRENDER
                                    Picture picture,
#else
                                    Qt::HANDLE picture,
#endif
                                    const QRegion &r)
{
    int num;
    XRectangle *rects = (XRectangle *)qt_getClipRects(r, num);

    if (gc)
        XSetClipRectangles( dpy, gc, 0, 0, rects, num, YXBanded );
    if (gc2)
        XSetClipRectangles( dpy, gc2, 0, 0, rects, num, YXBanded );

#ifndef QT_NO_XRENDER
    if (picture)
        XRenderSetPictureClipRectangles(dpy, picture, 0, 0, rects, num);
#else
    Q_UNUSED(picture);
#endif // QT_NO_XRENDER
}


static inline void x11ClearClipRegion(Display *dpy, GC gc, GC gc2,
#ifndef QT_NO_XRENDER
                                    Picture picture
#else
                                    Qt::HANDLE picture
#endif
                                      )
{
    if (gc)
        XSetClipMask(dpy, gc, XNone);
    if (gc2)
        XSetClipMask(dpy, gc2, XNone);

#ifndef QT_NO_XRENDER
    if (picture) {
        XRenderPictureAttributes attrs;
        attrs.clip_mask = XNone;
        XRenderChangePicture (dpy, picture, CPClipMask, &attrs);
    }
#else
    Q_UNUSED(picture);
#endif // QT_NO_XRENDER
}


#define DITHER_SIZE 16
static const uchar base_dither_matrix[DITHER_SIZE][DITHER_SIZE] = {
  {   0,192, 48,240, 12,204, 60,252,  3,195, 51,243, 15,207, 63,255 },
  { 128, 64,176,112,140, 76,188,124,131, 67,179,115,143, 79,191,127 },
  {  32,224, 16,208, 44,236, 28,220, 35,227, 19,211, 47,239, 31,223 },
  { 160, 96,144, 80,172,108,156, 92,163, 99,147, 83,175,111,159, 95 },
  {   8,200, 56,248,  4,196, 52,244, 11,203, 59,251,  7,199, 55,247 },
  { 136, 72,184,120,132, 68,180,116,139, 75,187,123,135, 71,183,119 },
  {  40,232, 24,216, 36,228, 20,212, 43,235, 27,219, 39,231, 23,215 },
  { 168,104,152, 88,164,100,148, 84,171,107,155, 91,167,103,151, 87 },
  {   2,194, 50,242, 14,206, 62,254,  1,193, 49,241, 13,205, 61,253 },
  { 130, 66,178,114,142, 78,190,126,129, 65,177,113,141, 77,189,125 },
  {  34,226, 18,210, 46,238, 30,222, 33,225, 17,209, 45,237, 29,221 },
  { 162, 98,146, 82,174,110,158, 94,161, 97,145, 81,173,109,157, 93 },
  {  10,202, 58,250,  6,198, 54,246,  9,201, 57,249,  5,197, 53,245 },
  { 138, 74,186,122,134, 70,182,118,137, 73,185,121,133, 69,181,117 },
  {  42,234, 26,218, 38,230, 22,214, 41,233, 25,217, 37,229, 21,213 },
  { 170,106,154, 90,166,102,150, 86,169,105,153, 89,165,101,149, 85 }
};

static QPixmap qt_patternForAlpha(uchar alpha, int screen)
{
    QPixmap pm;
    QString key = QLatin1String("$qt-alpha-brush$") + QString::number(alpha) + QString::number(screen);
    if (!QPixmapCache::find(key, pm)) {
        // #### why not use a mono image here????
        QImage pattern(DITHER_SIZE, DITHER_SIZE, QImage::Format_ARGB32);
        pattern.fill(0xffffffff);
        for (int y = 0; y < DITHER_SIZE; ++y) {
            for (int x = 0; x < DITHER_SIZE; ++x) {
                if (base_dither_matrix[x][y] <= alpha)
                    pattern.setPixel(x, y, 0x00000000);
            }
        }
        pm = QBitmap::fromImage(pattern);
        pm.x11SetScreen(screen);
        QPixmapCache::insert(key, pm);
    }
    return pm;
}

#if !defined(QT_NO_XRENDER)

class QXRenderTessellator : public QTessellator
{
public:
    QXRenderTessellator() : traps(0), allocated(0), size(0) {}
    ~QXRenderTessellator() { free(traps); }
    XTrapezoid *traps;
    int allocated;
    int size;
    void addTrap(const Trapezoid &trap);
    QRect tessellate(const QPointF *points, int nPoints, bool winding) {
        size = 0;
        setWinding(winding);
        return QTessellator::tessellate(points, nPoints).toRect();
    }
    void done() {
        if (allocated > 64) {
            free(traps);
            traps = 0;
            allocated = 0;
        }
    }
};

void QXRenderTessellator::addTrap(const Trapezoid &trap)
{
    if (size == allocated) {
        allocated = qMax(2*allocated, 64);
        traps = (XTrapezoid *)realloc(traps, allocated * sizeof(XTrapezoid));
    }
    traps[size].top = Q27Dot5ToXFixed(trap.top);
    traps[size].bottom = Q27Dot5ToXFixed(trap.bottom);
    traps[size].left.p1.x = Q27Dot5ToXFixed(trap.topLeft->x);
    traps[size].left.p1.y = Q27Dot5ToXFixed(trap.topLeft->y);
    traps[size].left.p2.x = Q27Dot5ToXFixed(trap.bottomLeft->x);
    traps[size].left.p2.y = Q27Dot5ToXFixed(trap.bottomLeft->y);
    traps[size].right.p1.x = Q27Dot5ToXFixed(trap.topRight->x);
    traps[size].right.p1.y = Q27Dot5ToXFixed(trap.topRight->y);
    traps[size].right.p2.x = Q27Dot5ToXFixed(trap.bottomRight->x);
    traps[size].right.p2.y = Q27Dot5ToXFixed(trap.bottomRight->y);
    ++size;
}

#endif // !defined(QT_NO_XRENDER)


#ifndef QT_NO_XRENDER
static Picture getPatternFill(int screen, const QBrush &b)
{
    if (!X11->use_xrender)
        return XNone;

    XRenderColor color = X11->preMultiply(b.color());
    XRenderColor bg_color;

    bg_color = X11->preMultiply(QColor(0, 0, 0, 0));

    for (int i = 0; i < X11->pattern_fill_count; ++i) {
        if (X11->pattern_fills[i].screen == screen
            && X11->pattern_fills[i].opaque == false
            && X11->pattern_fills[i].style == b.style()
            && X11->pattern_fills[i].color.alpha == color.alpha
            && X11->pattern_fills[i].color.red == color.red
            && X11->pattern_fills[i].color.green == color.green
            && X11->pattern_fills[i].color.blue == color.blue
            && X11->pattern_fills[i].bg_color.alpha == bg_color.alpha
            && X11->pattern_fills[i].bg_color.red == bg_color.red
            && X11->pattern_fills[i].bg_color.green == bg_color.green
            && X11->pattern_fills[i].bg_color.blue == bg_color.blue)
            return X11->pattern_fills[i].picture;
    }
    // none found, replace one
    int i = rand() % 16;

    if (X11->pattern_fills[i].screen != screen && X11->pattern_fills[i].picture) {
	XRenderFreePicture (X11->display, X11->pattern_fills[i].picture);
	X11->pattern_fills[i].picture = 0;
    }

    if (!X11->pattern_fills[i].picture) {
        Pixmap pixmap = XCreatePixmap (X11->display, RootWindow (X11->display, screen), 8, 8, 32);
        XRenderPictureAttributes attrs;
        attrs.repeat = True;
        X11->pattern_fills[i].picture = XRenderCreatePicture (X11->display, pixmap,
                                                              XRenderFindStandardFormat(X11->display, PictStandardARGB32),
                                                              CPRepeat, &attrs);
        XFreePixmap (X11->display, pixmap);
    }

    X11->pattern_fills[i].screen = screen;
    X11->pattern_fills[i].color = color;
    X11->pattern_fills[i].bg_color = bg_color;
    X11->pattern_fills[i].opaque = false;
    X11->pattern_fills[i].style = b.style();

    XRenderFillRectangle(X11->display, PictOpSrc, X11->pattern_fills[i].picture, &bg_color, 0, 0, 8, 8);

    QPixmap pattern(qt_pixmapForBrush(b.style(), true));
    XRenderPictureAttributes attrs;
    attrs.repeat = true;
    XRenderChangePicture(X11->display, pattern.x11PictureHandle(), CPRepeat, &attrs);

    Picture fill_fg = X11->getSolidFill(screen, b.color());
    XRenderComposite(X11->display, PictOpOver, fill_fg, pattern.x11PictureHandle(),
                     X11->pattern_fills[i].picture,
                     0, 0, 0, 0, 0, 0, 8, 8);

    return X11->pattern_fills[i].picture;
}

static void qt_render_bitmap(Display *dpy, int scrn, Picture src, Picture dst,
                      int sx, int sy, int x, int y, int sw, int sh,
                      const QPen &pen)
{
    Picture fill_fg = X11->getSolidFill(scrn, pen.color());
    XRenderComposite(dpy, PictOpOver,
                     fill_fg, src, dst, sx, sy, sx, sy, x, y, sw, sh);
}
#endif

void QX11PaintEnginePrivate::init()
{
    dpy = 0;
    scrn = 0;
    hd = 0;
    picture = 0;
    xinfo = 0;
#ifndef QT_NO_XRENDER
    current_brush = 0;
    composition_mode = PictOpOver;
    tessellator = new QXRenderTessellator;
#endif
}

void QX11PaintEnginePrivate::setupAdaptedOrigin(const QPoint &p)
{
    if (adapted_pen_origin)
        XSetTSOrigin(dpy, gc, p.x(), p.y());