WebScreenInfoFactory.mm   [plain text]

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

#import <AppKit/AppKit.h>

#include "WebScreenInfo.h"

namespace WebKit {

static NSScreen* screenForWindow(NSWindow* window)
{
    NSScreen* screen = [window screen];  // nil if the window is off-screen
    if (screen)
        return screen;

    NSArray* screens = [NSScreen screens];
    if ([screens count] > 0)
        return [screens objectAtIndex:0];  // screen containing the menubar

    return nil;
}

static WebRect toUserSpace(const NSRect& rect, NSWindow* destination)
{
    CGRect userRect = NSRectToCGRect(rect);

    userRect.origin.y =
        NSMaxY([screenForWindow(destination) frame]) - (userRect.origin.y + userRect.size.height); // flip

    if (destination) {
        CGFloat scale = 1 / [destination userSpaceScaleFactor];  // scale down
        userRect.origin.x *= scale;
        userRect.origin.y *= scale;
        userRect.size.width *= scale;
        userRect.size.height *= scale;
    }

    return WebRect(userRect.origin.x,
                   userRect.origin.y,
                   userRect.size.width,
                   userRect.size.height);
}

WebScreenInfo WebScreenInfoFactory::screenInfo(NSView* view)
{
    NSString *colorSpace = NSColorSpaceFromDepth([[NSScreen deepestScreen] depth]);

    WebScreenInfo results;

    // FIXME: Currently Mac seems to always report 72dpi. Need to find a way to
    // report the true screen dpi.
    NSWindow* window = [view window];
    NSDictionary* deviceDescription = [window deviceDescription];
    NSSize deviceDPI = [[deviceDescription valueForKey:NSDeviceResolution] sizeValue];
    results.horizontalDPI = static_cast<int>(deviceDPI.width);
    results.verticalDPI = static_cast<int>(deviceDPI.height);

    results.depth =
        NSBitsPerPixelFromDepth([[NSScreen deepestScreen] depth]);
    results.depthPerComponent =
        NSBitsPerSampleFromDepth([[NSScreen deepestScreen] depth]);
    results.isMonochrome = colorSpace == NSCalibratedWhiteColorSpace
                        || colorSpace == NSCalibratedBlackColorSpace
                        || colorSpace == NSDeviceWhiteColorSpace
                        || colorSpace == NSDeviceBlackColorSpace;
    results.rect =
        toUserSpace([screenForWindow([view window]) frame], [view window]);
    results.availableRect =
        toUserSpace([screenForWindow([view window]) visibleFrame], [view window]);
    return results;
}

} // namespace WebKit