SourceSizeList.cpp [plain text]
#include "config.h"
#include "SourceSizeList.h"
#include "CSSParser.h"
#include "CSSToLengthConversionData.h"
#include "MediaList.h"
#include "MediaQuery.h"
#include "MediaQueryEvaluator.h"
#include "MediaQueryExp.h"
#include "RenderStyle.h"
#include "RenderView.h"
namespace WebCore {
static bool match(std::unique_ptr<MediaQueryExp>&& expression, RenderStyle& style, Frame* frame)
{
if (expression->mediaFeature().isEmpty())
return true;
auto expList = std::make_unique<Vector<std::unique_ptr<MediaQueryExp>>>();
expList->append(WTF::move(expression));
RefPtr<MediaQuerySet> mediaQuerySet = MediaQuerySet::create();
mediaQuerySet->addMediaQuery(std::make_unique<MediaQuery>(MediaQuery::None, "all", WTF::move(expList)));
MediaQueryEvaluator mediaQueryEvaluator("screen", frame, &style);
return mediaQueryEvaluator.eval(mediaQuerySet.get());
}
static float defaultLength(RenderStyle& style, RenderView* view)
{
return clampTo<float>(CSSPrimitiveValue::computeNonCalcLengthDouble(CSSToLengthConversionData(&style, &style, view), CSSPrimitiveValue::CSS_VW, 100.0));
}
static float computeLength(CSSValue* value, RenderStyle& style, RenderView* view)
{
CSSToLengthConversionData conversionData(&style, &style, view);
if (is<CSSPrimitiveValue>(value)) {
CSSPrimitiveValue& primitiveValue = downcast<CSSPrimitiveValue>(*value);
if (!primitiveValue.isLength())
return defaultLength(style, view);
return primitiveValue.computeLength<float>(conversionData);
}
if (is<CSSCalcValue>(value))
return downcast<CSSCalcValue>(*value).computeLengthPx(conversionData);
return defaultLength(style, view);
}
float parseSizesAttribute(StringView sizesAttribute, RenderView* view, Frame* frame)
{
if (!view)
return 0;
RenderStyle& style = view->style();
for (auto& sourceSize : CSSParser(CSSStrictMode).parseSizesAttribute(sizesAttribute)) {
if (match(WTF::move(sourceSize.expression), style, frame))
return computeLength(sourceSize.length.get(), style, view);
}
return defaultLength(style, view);
}
}