WebScreenInfoFactory.cpp   [plain text]

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#include "config.h"
#include "WebScreenInfoFactory.h"

#include "WebScreenInfo.h"

#include <X11/Xlib.h>
#include <stdio.h>

namespace WebKit {

// FIXME: Take an X window and use XRandR to find the dimensions of the monitor
// that it's on (probably using XRRGetScreenInfo() and XRRConfigSizes() from
// X11/extensions/Xrandr.h). GDK provides a gdk_screen_get_monitor_geometry()
// function, but it appears to return stale data after the screen is resized.
WebScreenInfo WebScreenInfoFactory::screenInfo(Display* display, int screenNumber)
{
    const float inchesPerMillimeter = 25.4;
    // XDisplayWidth() and XDisplayHeight() return cached values. To ensure that
    // we return the correct dimensions after the screen is resized, query the
    // root window's geometry each time.
    Window root = RootWindow(display, screenNumber);
    Window rootRet;
    int x, y;
    unsigned int width, height, border, depth;
    XGetGeometry(
        display, root, &rootRet, &x, &y, &width, &height, &border, &depth);

    WebScreenInfo results;
    int displayWidth = DisplayWidth(display, screenNumber);
    int displayWidthInMillimeters = DisplayWidthMM(display, screenNumber);
    results.horizontalDPI = static_cast<int>(inchesPerMillimeter * displayWidth / displayWidthInMillimeters);

    int displayHeight = DisplayHeight(display, screenNumber);
    int displayHeightInMillimeters = DisplayHeightMM(display, screenNumber);
    results.verticalDPI = static_cast<int>(inchesPerMillimeter * displayHeight / displayHeightInMillimeters);

    // FIXME: Not all screens use 8bpp.
    results.depthPerComponent = 8;
    results.depth = depth;
    results.isMonochrome = depth == 1;
    results.rect = WebRect(x, y, width, height);
    // FIXME: Query the _NET_WORKAREA property from EWMH.
    results.availableRect = results.rect;

    return results;
}

} // namespace WebKit