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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/css/MediaValues.h"
#include "core/css/CSSHelper.h"
#include "core/css/MediaValuesCached.h"
#include "core/css/MediaValuesDynamic.h"
#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/frame/FrameHost.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "core/page/Page.h"
#include "core/rendering/RenderObject.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/compositing/RenderLayerCompositor.h"
#include "core/rendering/style/RenderStyle.h"
#include "platform/PlatformScreen.h"
namespace WebCore {
PassRefPtr<MediaValues> MediaValues::createDynamicIfFrameExists(LocalFrame* frame)
{
if (frame)
return MediaValuesDynamic::create(frame);
return MediaValuesCached::create();
}
int MediaValues::calculateViewportWidth(LocalFrame* frame) const
{
ASSERT(frame && frame->view() && frame->document());
int viewportWidth = frame->view()->layoutSize(IncludeScrollbars).width();
return adjustForAbsoluteZoom(viewportWidth, frame->document()->renderView());
}
int MediaValues::calculateViewportHeight(LocalFrame* frame) const
{
ASSERT(frame && frame->view() && frame->document());
int viewportHeight = frame->view()->layoutSize(IncludeScrollbars).height();
return adjustForAbsoluteZoom(viewportHeight, frame->document()->renderView());
}
int MediaValues::calculateDeviceWidth(LocalFrame* frame) const
{
ASSERT(frame && frame->view() && frame->settings() && frame->host());
int deviceWidth = static_cast<int>(screenRect(frame->view()).width());
if (frame->settings()->reportScreenSizeInPhysicalPixelsQuirk())
deviceWidth = lroundf(deviceWidth * frame->host()->deviceScaleFactor());
return deviceWidth;
}
int MediaValues::calculateDeviceHeight(LocalFrame* frame) const
{
ASSERT(frame && frame->view() && frame->settings() && frame->host());
int deviceHeight = static_cast<int>(screenRect(frame->view()).height());
if (frame->settings()->reportScreenSizeInPhysicalPixelsQuirk())
deviceHeight = lroundf(deviceHeight * frame->host()->deviceScaleFactor());
return deviceHeight;
}
bool MediaValues::calculateStrictMode(LocalFrame* frame) const
{
ASSERT(frame && frame->document());
return !frame->document()->inQuirksMode();
}
float MediaValues::calculateDevicePixelRatio(LocalFrame* frame) const
{
return frame->devicePixelRatio();
}
int MediaValues::calculateColorBitsPerComponent(LocalFrame* frame) const
{
ASSERT(frame && frame->page() && frame->page()->mainFrame());
if (!frame->page()->mainFrame()->isLocalFrame()
|| screenIsMonochrome(frame->page()->deprecatedLocalMainFrame()->view()))
return 0;
return screenDepthPerComponent(frame->view());
}
int MediaValues::calculateMonochromeBitsPerComponent(LocalFrame* frame) const
{
ASSERT(frame && frame->page() && frame->page()->mainFrame());
if (!frame->page()->mainFrame()->isLocalFrame()
|| !screenIsMonochrome(frame->page()->deprecatedLocalMainFrame()->view()))
return 0;
return screenDepthPerComponent(frame->view());
}
int MediaValues::calculateDefaultFontSize(LocalFrame* frame) const
{
return frame->host()->settings().defaultFontSize();
}
bool MediaValues::calculateScanMediaType(LocalFrame* frame) const
{
ASSERT(frame && frame->view());
// Scan only applies to 'tv' media.
return equalIgnoringCase(frame->view()->mediaType(), "tv");
}
bool MediaValues::calculateScreenMediaType(LocalFrame* frame) const
{
ASSERT(frame && frame->view());
return equalIgnoringCase(frame->view()->mediaType(), "screen");
}
bool MediaValues::calculatePrintMediaType(LocalFrame* frame) const
{
ASSERT(frame && frame->view());
return equalIgnoringCase(frame->view()->mediaType(), "print");
}
bool MediaValues::calculateThreeDEnabled(LocalFrame* frame) const
{
ASSERT(frame && frame->contentRenderer() && frame->contentRenderer()->compositor());
bool threeDEnabled = false;
if (RenderView* view = frame->contentRenderer())
threeDEnabled = view->compositor()->hasAcceleratedCompositing();
return threeDEnabled;
}
MediaValues::PointerDeviceType MediaValues::calculateLeastCapablePrimaryPointerDeviceType(LocalFrame* frame) const
{
ASSERT(frame && frame->settings());
if (frame->settings()->deviceSupportsTouch())
return MediaValues::TouchPointer;
// FIXME: We should also try to determine if we know we have a mouse.
// When we do this, we'll also need to differentiate between known not to
// have mouse or touch screen (NoPointer) and unknown (UnknownPointer).
// We could also take into account other preferences like accessibility
// settings to decide which of the available pointers should be considered
// "primary".
return MediaValues::UnknownPointer;
}
bool MediaValues::computeLengthImpl(double value, CSSPrimitiveValue::UnitType type, unsigned defaultFontSize, unsigned viewportWidth, unsigned viewportHeight, double& result)
{
// The logic in this function is duplicated from CSSPrimitiveValue::computeLengthDouble
// because MediaValues::computeLength needs nearly identical logic, but we haven't found a way to make
// CSSPrimitiveValue::computeLengthDouble more generic (to solve both cases) without hurting performance.
// FIXME - Unite the logic here with CSSPrimitiveValue in a performant way.
double factor = 0;
switch (type) {
case CSSPrimitiveValue::CSS_EMS:
case CSSPrimitiveValue::CSS_REMS:
factor = defaultFontSize;
break;
case CSSPrimitiveValue::CSS_PX:
factor = 1;
break;
case CSSPrimitiveValue::CSS_EXS:
// FIXME: We have a bug right now where the zoom will be applied twice to EX units.
// FIXME: We don't seem to be able to cache fontMetrics related values.
// Trying to access them is triggering some sort of microtask. Serving the spec's default instead.
factor = defaultFontSize / 2.0;
break;
case CSSPrimitiveValue::CSS_CHS:
// FIXME: We don't seem to be able to cache fontMetrics related values.
// Trying to access them is triggering some sort of microtask. Serving the (future) spec default instead.
factor = defaultFontSize / 2.0;
break;
case CSSPrimitiveValue::CSS_VW:
factor = viewportWidth / 100.0;
break;
case CSSPrimitiveValue::CSS_VH:
factor = viewportHeight / 100.0;
break;
case CSSPrimitiveValue::CSS_VMIN:
factor = std::min(viewportWidth, viewportHeight) / 100.0;
break;
case CSSPrimitiveValue::CSS_VMAX:
factor = std::max(viewportWidth, viewportHeight) / 100.0;
break;
case CSSPrimitiveValue::CSS_CM:
factor = cssPixelsPerCentimeter;
break;
case CSSPrimitiveValue::CSS_MM:
factor = cssPixelsPerMillimeter;
break;
case CSSPrimitiveValue::CSS_IN:
factor = cssPixelsPerInch;
break;
case CSSPrimitiveValue::CSS_PT:
factor = cssPixelsPerPoint;
break;
case CSSPrimitiveValue::CSS_PC:
factor = cssPixelsPerPica;
break;
default:
return false;
}
ASSERT(factor > 0);
result = value * factor;
return true;
}
} // namespace
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