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/*
* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
* Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
* Copyright (C) 2012 Intel Corporation. All rights reserved.
* Copyright (C) 2013, 2014 Adobe Systems Incorporated. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "OffscreenCanvasRenderingContext2D.h"
#if ENABLE(OFFSCREEN_CANVAS)
#include "CSSFontSelector.h"
#include "CSSPropertyParserHelpers.h"
#include "CSSPropertyParserWorkerSafe.h"
#include "InspectorInstrumentation.h"
#include "RenderStyle.h"
#include "ScriptExecutionContext.h"
#include "StyleResolveForFontRaw.h"
#include "TextMetrics.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(OffscreenCanvasRenderingContext2D);
bool OffscreenCanvasRenderingContext2D::enabledForContext(ScriptExecutionContext& context)
{
UNUSED_PARAM(context);
#if ENABLE(OFFSCREEN_CANVAS_IN_WORKERS)
if (context.isWorkerGlobalScope())
return context.settingsValues().offscreenCanvasInWorkersEnabled;
#endif
ASSERT(context.isDocument());
return true;
}
std::unique_ptr<OffscreenCanvasRenderingContext2D> OffscreenCanvasRenderingContext2D::create(CanvasBase& canvas, CanvasRenderingContext2DSettings&& settings)
{
auto renderingContext = std::unique_ptr<OffscreenCanvasRenderingContext2D>(new OffscreenCanvasRenderingContext2D(canvas, WTFMove(settings)));
InspectorInstrumentation::didCreateCanvasRenderingContext(*renderingContext);
return renderingContext;
}
OffscreenCanvasRenderingContext2D::OffscreenCanvasRenderingContext2D(CanvasBase& canvas, CanvasRenderingContext2DSettings&& settings)
: CanvasRenderingContext2DBase(canvas, WTFMove(settings), false)
{
}
OffscreenCanvasRenderingContext2D::~OffscreenCanvasRenderingContext2D() = default;
void OffscreenCanvasRenderingContext2D::commit()
{
downcast<OffscreenCanvas>(canvasBase()).commitToPlaceholderCanvas();
}
void OffscreenCanvasRenderingContext2D::setFont(const String& newFont)
{
auto& context = *canvasBase().scriptExecutionContext();
if (newFont.isEmpty())
return;
if (newFont == state().unparsedFont && state().font.realized())
return;
// According to http://lists.w3.org/Archives/Public/public-html/2009Jul/0947.html,
// the "inherit" and "initial" values must be ignored. CSSPropertyParserWorkerSafe::parseFont() ignores these.
auto fontRaw = CSSPropertyParserWorkerSafe::parseFont(newFont, strictToCSSParserMode(!usesCSSCompatibilityParseMode()));
if (!fontRaw)
return;
// The parse succeeded.
String newFontSafeCopy(newFont); // Create a string copy since newFont can be deleted inside realizeSaves.
realizeSaves();
modifiableState().unparsedFont = newFontSafeCopy;
// Map the <canvas> font into the text style. If the font uses keywords like larger/smaller, these will work
// relative to the default font.
FontCascadeDescription fontDescription;
fontDescription.setOneFamily(DefaultFontFamily);
fontDescription.setSpecifiedSize(DefaultFontSize);
fontDescription.setComputedSize(DefaultFontSize);
if (auto fontCascade = Style::resolveForFontRaw(*fontRaw, WTFMove(fontDescription), context)) {
ASSERT(context.cssFontSelector());
modifiableState().font.initialize(*context.cssFontSelector(), *fontCascade);
}
}
CanvasDirection OffscreenCanvasRenderingContext2D::direction() const
{
// FIXME: What should we do about inherit here?
switch (state().direction) {
case Direction::Inherit:
case Direction::Ltr:
return Direction::Ltr;
case Direction::Rtl:
return Direction::Rtl;
}
ASSERT_NOT_REACHED();
return Direction::Ltr;
}
auto OffscreenCanvasRenderingContext2D::fontProxy() -> const FontProxy* {
if (!state().font.realized())
setFont(state().unparsedFont);
return &state().font;
}
void OffscreenCanvasRenderingContext2D::fillText(const String& text, double x, double y, std::optional<double> maxWidth)
{
drawText(text, x, y, true, maxWidth);
}
void OffscreenCanvasRenderingContext2D::strokeText(const String& text, double x, double y, std::optional<double> maxWidth)
{
drawText(text, x, y, false, maxWidth);
}
Ref<TextMetrics> OffscreenCanvasRenderingContext2D::measureText(const String& text)
{
return measureTextInternal(text);
}
} // namespace WebCore
#endif
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