qcolormap_x11.cpp File Reference

#include "qcolormap.h"
#include "qapplication.h"
#include "qdebug.h"
#include "qdesktopwidget.h"
#include "qvarlengtharray.h"
#include "qx11info_x11.h"
#include <private/qt_x11_p.h>
#include <limits.h>

Go to the source code of this file.

Classes
class	QColormapPrivate

Functions
static int	cube_root (int v)
static Visual *	find_visual (Display *display, int screen, int visual_class, int visual_id, int *depth, bool *defaultVisual)
static void	init_direct (QColormapPrivate *d, bool ownColormap)
static void	init_gray (QColormapPrivate *d, int screen)
static void	init_indexed (QColormapPrivate *d, int screen)
static int	lowest_bit (uint v)
static void	query_colormap (QColormapPrivate *d, int screen)
static uint	right_align (uint v)

Variables
static QColormap **	cmaps = 0

Function Documentation

cube_root()

static int cube_root ( int  v )

static

Definition at line 106 of file qcolormap_x11.cpp.

{
    if (v == 1)
        return 1;
    // brute force algorithm
    int i = 1;
    for (;;) {
        const int b = i * i * i;
        if (b <= v) {
            ++i;
        } else {
            --i;
            break;
        }
    }
    return i;
}

find_visual()

static Visual* find_visual ( Display *  display, int  screen, int  visual_class, int  visual_id, int *  depth, bool *  defaultVisual  )

static

Definition at line 124 of file qcolormap_x11.cpp.

{
    XVisualInfo *vi, rvi;
    int count;

    uint mask = VisualScreenMask;
    rvi.screen = screen;

    if (visual_class != -1) {
        rvi.c_class = visual_class;
        mask |= VisualClassMask;
    }
    if (visual_id != -1) {
        rvi.visualid = visual_id;
        mask |= VisualIDMask;
    }

    Visual *visual = DefaultVisual(display, screen);
    *defaultVisual = true;
    *depth = DefaultDepth(display, screen);

    vi = XGetVisualInfo(display, mask, &rvi, &count);
    if (vi) {
        int best = 0;
        for (int x = 0; x < count; ++x) {
            if (vi[x].depth > vi[best].depth)
                best = x;
        }
        if (best >= 0 && best <= count && vi[best].visualid != XVisualIDFromVisual(visual)) {
            visual = vi[best].visual;
            *defaultVisual = (visual == DefaultVisual(display, screen));
            *depth = vi[best].depth;
        }
    }
    if (vi)
        XFree((char *)vi);
    return visual;
}

init_direct()

static void init_direct ( QColormapPrivate *  d, bool  ownColormap  )

static

Definition at line 304 of file qcolormap_x11.cpp.

{
    if (d->visual->c_class != DirectColor || !ownColormap)
        return;

    // preallocate 768 on the stack, so that we don't have to malloc
    // for the common case (<= 24 bpp)
    QVarLengthArray<XColor, 768> colorTable(d->r_max + d->g_max + d->b_max);
    int i = 0;

    for (int r = 0; r < d->r_max; ++r) {
        colorTable[i].red = r << 8 | r;
        colorTable[i].pixel = r << d->r_shift;
        colorTable[i].flags = DoRed;
        ++i;
    }

    for (int g = 0; g < d->g_max; ++g) {
        colorTable[i].green = g << 8 | g;
        colorTable[i].pixel = g << d->g_shift;
        colorTable[i].flags = DoGreen;
        ++i;
    }

    for (int b = 0; b < d->b_max; ++b) {
        colorTable[i].blue = (b << 8 | b);
        colorTable[i].pixel = b << d->b_shift;
        colorTable[i].flags = DoBlue;
        ++i;
    }

    XStoreColors(X11->display, d->colormap, colorTable.data(), colorTable.count());
}

init_gray()

static void init_gray ( QColormapPrivate *  d, int  screen  )

static

Definition at line 248 of file qcolormap_x11.cpp.

{
    d->pixels.resize(d->r_max);

    for (int g = 0; g < d->g_max; ++g) {
        const int gray = (g * 0xff + (d->r_max - 1) / 2) / (d->r_max - 1);
        const QRgb rgb = qRgb(gray, gray, gray);

        d->pixels[g] = -1;

        if (d->visual->c_class & 1) {
            XColor xcolor;
            xcolor.red   =   qRed(rgb) * 0x101;
            xcolor.green = qGreen(rgb) * 0x101;
            xcolor.blue  =  qBlue(rgb) * 0x101;
            xcolor.pixel = 0ul;

            if (XAllocColor(QX11Info::display(), d->colormap, &xcolor))
                d->pixels[g] = xcolor.pixel;
        }
    }

    query_colormap(d, screen);
}

init_indexed()

static void init_indexed ( QColormapPrivate *  d, int  screen  )

static

Definition at line 273 of file qcolormap_x11.cpp.

{
    d->pixels.resize(d->r_max * d->g_max * d->b_max);

    // create color cube
    for (int x = 0, r = 0; r < d->r_max; ++r) {
        for (int g = 0; g < d->g_max; ++g) {
            for (int b = 0; b < d->b_max; ++b, ++x) {
                const QRgb rgb = qRgb((r * 0xff + (d->r_max - 1) / 2) / (d->r_max - 1),
                                      (g * 0xff + (d->g_max - 1) / 2) / (d->g_max - 1),
                                      (b * 0xff + (d->b_max - 1) / 2) / (d->b_max - 1));

                d->pixels[x] = -1;

                if (d->visual->c_class & 1) {
                    XColor xcolor;
                    xcolor.red   =   qRed(rgb) * 0x101;
                    xcolor.green = qGreen(rgb) * 0x101;
                    xcolor.blue  =  qBlue(rgb) * 0x101;
                    xcolor.pixel = 0ul;

                    if (XAllocColor(QX11Info::display(), d->colormap, &xcolor))
                        d->pixels[x] = xcolor.pixel;
                }
            }
        }
    }

    query_colormap(d, screen);
}

lowest_bit()

static int lowest_bit ( uint  v )

static

Definition at line 97 of file qcolormap_x11.cpp.

{
    int i;
    uint b = 1u;
    for (i = 0; ((v & b) == 0u) && i < 32;  ++i)
        b <<= 1u;
    return i == 32 ? -1 : i;
}

query_colormap()

static void query_colormap ( QColormapPrivate *  d, int  screen  )

static

Definition at line 168 of file qcolormap_x11.cpp.

Referenced by init_gray(), and init_indexed().

{
    Display *display = QX11Info::display();

    // query existing colormap
    int q_colors = (((1u << d->depth) > 256u) ? 256u : (1u << d->depth));
    XColor queried[256];
    memset(queried, 0, sizeof(queried));
    for (int x = 0; x < q_colors; ++x)
        queried[x].pixel = x;
    XQueryColors(display, d->colormap, queried, q_colors);

    d->colors.resize(q_colors);
    for (int x = 0; x < q_colors; ++x) {
        if (queried[x].red == 0
            && queried[x].green == 0
            && queried[x].blue == 0
            && queried[x].pixel != BlackPixel(display, screen)) {
            // unallocated color cell, skip it
            continue;
        }

        d->colors[x] = QColor::fromRgbF(queried[x].red / float(USHRT_MAX),
                                        queried[x].green / float(USHRT_MAX),
                                        queried[x].blue / float(USHRT_MAX));
    }

    // for missing colors, find the closest color in the existing colormap
    Q_ASSERT(d->pixels.size());
    for (int x = 0; x < d->pixels.size(); ++x) {
        if (d->pixels.at(x) != -1)
            continue;

        QRgb rgb;
        if (d->mode == QColormap::Indexed) {
            const int r = (x / (d->g_max * d->b_max)) % d->r_max;
            const int g = (x / d->b_max) % d->g_max;
            const int b = x % d->b_max;
            rgb = qRgb((r * 0xff + (d->r_max - 1) / 2) / (d->r_max - 1),
                       (g * 0xff + (d->g_max - 1) / 2) / (d->g_max - 1),
                       (b * 0xff + (d->b_max - 1) / 2) / (d->b_max - 1));
        } else {
            rgb = qRgb(x, x, x);
        }

        // find closest color
        int mindist = INT_MAX, best = -1;
        for (int y = 0; y < q_colors; ++y) {
            int r =   qRed(rgb) - (queried[y].red   >> 8);
            int g = qGreen(rgb) - (queried[y].green >> 8);
            int b =  qBlue(rgb) - (queried[y].blue  >> 8);
            int dist = (r * r) + (g * g) + (b * b);
            if (dist < mindist) {
                mindist = dist;
                best = y;
            }
        }

        Q_ASSERT(best >= 0 && best < q_colors);
        if (d->visual->c_class & 1) {
            XColor xcolor;
            xcolor.red   = queried[best].red;
            xcolor.green = queried[best].green;
            xcolor.blue  = queried[best].blue;
            xcolor.pixel = queried[best].pixel;

            if (XAllocColor(display, d->colormap, &xcolor)) {
                d->pixels[x] = xcolor.pixel;
            } else {
                // some weird stuff is going on...
                d->pixels[x] = (qGray(rgb) < 127
                                ? BlackPixel(display, screen)
                                : WhitePixel(display, screen));
            }
        } else {
            d->pixels[x] = best;
        }
    }
}

right_align()

static uint right_align ( uint  v )

static

Definition at line 90 of file qcolormap_x11.cpp.

{
    while (!(v & 0x1))
        v >>= 1;
    return v;
}

Variable Documentation

cmaps

QColormap** cmaps = 0

static

Definition at line 338 of file qcolormap_x11.cpp.