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nsMediaFeatures.cpp
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nsMediaFeatures.cpp
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/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsMediaFeatures.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* the features that media queries can test */
#include "nsMediaFeatures.h"
#include "nsGkAtoms.h"
#include "nsCSSKeywords.h"
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsCSSValue.h"
#include "nsIDocShell.h"
#include "nsLayoutUtils.h"
#include "nsILookAndFeel.h"
#include "nsCSSRuleProcessor.h"
static const PRInt32 kOrientationKeywords[] = {
eCSSKeyword_portrait, NS_STYLE_ORIENTATION_PORTRAIT,
eCSSKeyword_landscape, NS_STYLE_ORIENTATION_LANDSCAPE,
eCSSKeyword_UNKNOWN, -1
};
static const PRInt32 kScanKeywords[] = {
eCSSKeyword_progressive, NS_STYLE_SCAN_PROGRESSIVE,
eCSSKeyword_interlace, NS_STYLE_SCAN_INTERLACE,
eCSSKeyword_UNKNOWN, -1
};
#ifdef XP_WIN
struct WindowsThemeName {
nsILookAndFeel::WindowsThemeIdentifier id;
const wchar_t* name;
};
// Windows theme identities used in the -moz-windows-theme media query.
const WindowsThemeName themeStrings[] = {
{ nsILookAndFeel::eWindowsTheme_Aero, L"aero" },
{ nsILookAndFeel::eWindowsTheme_LunaBlue, L"luna-blue" },
{ nsILookAndFeel::eWindowsTheme_LunaOlive, L"luna-olive" },
{ nsILookAndFeel::eWindowsTheme_LunaSilver, L"luna-silver" },
{ nsILookAndFeel::eWindowsTheme_Royale, L"royale" },
{ nsILookAndFeel::eWindowsTheme_Zune, L"zune" },
{ nsILookAndFeel::eWindowsTheme_Generic, L"generic" }
};
#endif
// A helper for four features below
static nsSize
GetSize(nsPresContext* aPresContext)
{
nsSize size;
if (aPresContext->IsRootPaginatedDocument())
// We want the page size, including unprintable areas and margins.
size = aPresContext->GetPageSize();
else
size = aPresContext->GetVisibleArea().Size();
return size;
}
static nsresult
GetWidth(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetSize(aPresContext);
float pixelWidth = aPresContext->AppUnitsToFloatCSSPixels(size.width);
aResult.SetFloatValue(pixelWidth, eCSSUnit_Pixel);
return NS_OK;
}
static nsresult
GetHeight(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetSize(aPresContext);
float pixelHeight = aPresContext->AppUnitsToFloatCSSPixels(size.height);
aResult.SetFloatValue(pixelHeight, eCSSUnit_Pixel);
return NS_OK;
}
inline static nsDeviceContext*
GetDeviceContextFor(nsPresContext* aPresContext)
{
// It would be nice to call
// nsLayoutUtils::GetDeviceContextForScreenInfo here, except for two
// things: (1) it can flush, and flushing is bad here, and (2) it
// doesn't really get us consistency in multi-monitor situations
// *anyway*.
return aPresContext->DeviceContext();
}
// A helper for three features below.
static nsSize
GetDeviceSize(nsPresContext* aPresContext)
{
nsSize size;
if (aPresContext->IsRootPaginatedDocument())
// We want the page size, including unprintable areas and margins.
// XXX The spec actually says we want the "page sheet size", but
// how is that different?
size = aPresContext->GetPageSize();
else
GetDeviceContextFor(aPresContext)->
GetDeviceSurfaceDimensions(size.width, size.height);
return size;
}
static nsresult
GetDeviceWidth(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetDeviceSize(aPresContext);
float pixelWidth = aPresContext->AppUnitsToFloatCSSPixels(size.width);
aResult.SetFloatValue(pixelWidth, eCSSUnit_Pixel);
return NS_OK;
}
static nsresult
GetDeviceHeight(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetDeviceSize(aPresContext);
float pixelHeight = aPresContext->AppUnitsToFloatCSSPixels(size.height);
aResult.SetFloatValue(pixelHeight, eCSSUnit_Pixel);
return NS_OK;
}
static nsresult
GetOrientation(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetSize(aPresContext);
PRInt32 orientation;
if (size.width > size.height) {
orientation = NS_STYLE_ORIENTATION_LANDSCAPE;
} else {
// Per spec, square viewports should be 'portrait'
orientation = NS_STYLE_ORIENTATION_PORTRAIT;
}
aResult.SetIntValue(orientation, eCSSUnit_Enumerated);
return NS_OK;
}
static nsresult
GetDeviceOrientation(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetDeviceSize(aPresContext);
PRInt32 orientation;
if (size.width > size.height) {
orientation = NS_STYLE_ORIENTATION_LANDSCAPE;
} else {
// Per spec, square viewports should be 'portrait'
orientation = NS_STYLE_ORIENTATION_PORTRAIT;
}
aResult.SetIntValue(orientation, eCSSUnit_Enumerated);
return NS_OK;
}
// Helper for two features below
static nsresult
MakeArray(const nsSize& aSize, nsCSSValue& aResult)
{
nsRefPtr<nsCSSValue::Array> a = nsCSSValue::Array::Create(2);
a->Item(0).SetIntValue(aSize.width, eCSSUnit_Integer);
a->Item(1).SetIntValue(aSize.height, eCSSUnit_Integer);
aResult.SetArrayValue(a, eCSSUnit_Array);
return NS_OK;
}
static nsresult
GetAspectRatio(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
return MakeArray(GetSize(aPresContext), aResult);
}
static nsresult
GetDeviceAspectRatio(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
return MakeArray(GetDeviceSize(aPresContext), aResult);
}
static nsresult
GetColor(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// FIXME: This implementation is bogus. nsDeviceContext
// doesn't provide reliable information (should be fixed in bug
// 424386).
// FIXME: On a monochrome device, return 0!
nsDeviceContext *dx = GetDeviceContextFor(aPresContext);
PRUint32 depth;
dx->GetDepth(depth);
// The spec says to use bits *per color component*, so divide by 3,
// and round down, since the spec says to use the smallest when the
// color components differ.
depth /= 3;
aResult.SetIntValue(PRInt32(depth), eCSSUnit_Integer);
return NS_OK;
}
static nsresult
GetColorIndex(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// We should return zero if the device does not use a color lookup
// table. Stuart says that our handling of displays with 8-bit
// color is bad enough that we never change the lookup table to
// match what we're trying to display, so perhaps we should always
// return zero. Given that there isn't any better information
// exposed, we don't have much other choice.
aResult.SetIntValue(0, eCSSUnit_Integer);
return NS_OK;
}
static nsresult
GetMonochrome(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// For color devices we should return 0.
// FIXME: On a monochrome device, return the actual color depth, not
// 0!
aResult.SetIntValue(0, eCSSUnit_Integer);
return NS_OK;
}
static nsresult
GetResolution(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// Resolution values are in device pixels, not CSS pixels.
nsDeviceContext *dx = GetDeviceContextFor(aPresContext);
float dpi = float(dx->AppUnitsPerPhysicalInch()) / float(dx->AppUnitsPerDevPixel());
aResult.SetFloatValue(dpi, eCSSUnit_Inch);
return NS_OK;
}
static nsresult
GetScan(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// Since Gecko doesn't support the 'tv' media type, the 'scan'
// feature is never present.
aResult.Reset();
return NS_OK;
}
static nsresult
GetGrid(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// Gecko doesn't support grid devices (e.g., ttys), so the 'grid'
// feature is always 0.
aResult.SetIntValue(0, eCSSUnit_Integer);
return NS_OK;
}
static nsresult
GetDevicePixelRatio(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
float ratio = aPresContext->CSSPixelsToDevPixels(1.0f);
aResult.SetFloatValue(ratio, eCSSUnit_Number);
return NS_OK;
}
static nsresult
GetSystemMetric(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
nsCSSValue& aResult)
{
NS_ABORT_IF_FALSE(aFeature->mValueType == nsMediaFeature::eBoolInteger,
"unexpected type");
nsIAtom *metricAtom = *aFeature->mData.mMetric;
PRBool hasMetric = nsCSSRuleProcessor::HasSystemMetric(metricAtom);
aResult.SetIntValue(hasMetric ? 1 : 0, eCSSUnit_Integer);
return NS_OK;
}
static nsresult
GetWindowsTheme(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
nsCSSValue& aResult)
{
aResult.Reset();
#ifdef XP_WIN
PRUint8 windowsThemeId =
nsCSSRuleProcessor::GetWindowsThemeIdentifier();
// Classic mode should fail to match.
if (windowsThemeId == nsILookAndFeel::eWindowsTheme_Classic)
return NS_OK;
// Look up the appropriate theme string
for (size_t i = 0; i < NS_ARRAY_LENGTH(themeStrings); ++i) {
if (windowsThemeId == themeStrings[i].id) {
aResult.SetStringValue(nsDependentString(themeStrings[i].name),
eCSSUnit_Ident);
break;
}
}
#endif
return NS_OK;
}
/*
* Adding new media features requires (1) adding the new feature to this
* array, with appropriate entries (and potentially any new code needed
* to support new types in these entries and (2) ensuring that either
* nsPresContext::MediaFeatureValuesChanged or
* nsPresContext::PostMediaFeatureValuesChangedEvent is called when the
* value that would be returned by the entry's mGetter changes.
*/
/* static */ const nsMediaFeature
nsMediaFeatures::features[] = {
{
&nsGkAtoms::width,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eLength,
{ nsnull },
GetWidth
},
{
&nsGkAtoms::height,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eLength,
{ nsnull },
GetHeight
},
{
&nsGkAtoms::deviceWidth,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eLength,
{ nsnull },
GetDeviceWidth
},
{
&nsGkAtoms::deviceHeight,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eLength,
{ nsnull },
GetDeviceHeight
},
{
&nsGkAtoms::orientation,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eEnumerated,
{ kOrientationKeywords },
GetOrientation
},
{
&nsGkAtoms::aspectRatio,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eIntRatio,
{ nsnull },
GetAspectRatio
},
{
&nsGkAtoms::deviceAspectRatio,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eIntRatio,
{ nsnull },
GetDeviceAspectRatio
},
{
&nsGkAtoms::color,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eInteger,
{ nsnull },
GetColor
},
{
&nsGkAtoms::colorIndex,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eInteger,
{ nsnull },
GetColorIndex
},
{
&nsGkAtoms::monochrome,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eInteger,
{ nsnull },
GetMonochrome
},
{
&nsGkAtoms::resolution,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eResolution,
{ nsnull },
GetResolution
},
{
&nsGkAtoms::scan,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eEnumerated,
{ kScanKeywords },
GetScan
},
{
&nsGkAtoms::grid,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ nsnull },
GetGrid
},
// Mozilla extensions
{
&nsGkAtoms::_moz_device_pixel_ratio,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eFloat,
{ nsnull },
GetDevicePixelRatio
},
{
&nsGkAtoms::_moz_device_orientation,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eEnumerated,
{ kOrientationKeywords },
GetDeviceOrientation
},
{
&nsGkAtoms::_moz_scrollbar_start_backward,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::scrollbar_start_backward },
GetSystemMetric
},
{
&nsGkAtoms::_moz_scrollbar_start_forward,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::scrollbar_start_forward },
GetSystemMetric
},
{
&nsGkAtoms::_moz_scrollbar_end_backward,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::scrollbar_end_backward },
GetSystemMetric
},
{
&nsGkAtoms::_moz_scrollbar_end_forward,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::scrollbar_end_forward },
GetSystemMetric
},
{
&nsGkAtoms::_moz_scrollbar_thumb_proportional,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::scrollbar_thumb_proportional },
GetSystemMetric
},
{
&nsGkAtoms::_moz_images_in_menus,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::images_in_menus },
GetSystemMetric
},
{
&nsGkAtoms::_moz_images_in_buttons,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::images_in_buttons },
GetSystemMetric
},
{
&nsGkAtoms::_moz_windows_default_theme,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::windows_default_theme },
GetSystemMetric
},
{
&nsGkAtoms::_moz_mac_graphite_theme,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::mac_graphite_theme },
GetSystemMetric
},
{
&nsGkAtoms::_moz_windows_compositor,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::windows_compositor },
GetSystemMetric
},
{
&nsGkAtoms::_moz_windows_classic,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::windows_classic },
GetSystemMetric
},
{
&nsGkAtoms::_moz_touch_enabled,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::touch_enabled },
GetSystemMetric
},
{
&nsGkAtoms::_moz_maemo_classic,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::maemo_classic },
GetSystemMetric
},
{
&nsGkAtoms::_moz_menubar_drag,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eBoolInteger,
{ &nsGkAtoms::menubar_drag },
GetSystemMetric
},
{
&nsGkAtoms::_moz_windows_theme,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eIdent,
{ nsnull },
GetWindowsTheme
},
// Null-mName terminator:
{
nsnull,
nsMediaFeature::eMinMaxAllowed,
nsMediaFeature::eInteger,
{ nsnull },
nsnull
},
};