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/*
* Copyright (C) 2017 Apple 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:
* 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. AND ITS 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 APPLE INC. OR ITS 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 "ImageBitmapRenderingContext.h"
#include "HTMLCanvasElement.h"
#include "ImageBitmap.h"
#include "ImageBuffer.h"
#include "InspectorInstrumentation.h"
#include "OffscreenCanvas.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBitmapRenderingContext);
std::unique_ptr<ImageBitmapRenderingContext> ImageBitmapRenderingContext::create(CanvasBase& canvas, ImageBitmapRenderingContextSettings&& settings)
{
auto renderingContext = std::unique_ptr<ImageBitmapRenderingContext>(new ImageBitmapRenderingContext(canvas, WTFMove(settings)));
InspectorInstrumentation::didCreateCanvasRenderingContext(*renderingContext);
return renderingContext;
}
ImageBitmapRenderingContext::ImageBitmapRenderingContext(CanvasBase& canvas, ImageBitmapRenderingContextSettings&& settings)
: CanvasRenderingContext(canvas)
, m_settings(WTFMove(settings))
{
setOutputBitmap(nullptr);
}
ImageBitmapRenderingContext::~ImageBitmapRenderingContext() = default;
ImageBitmapCanvas ImageBitmapRenderingContext::canvas()
{
auto& base = canvasBase();
#if ENABLE(OFFSCREEN_CANVAS)
if (is<OffscreenCanvas>(base))
return &downcast<OffscreenCanvas>(base);
#endif
return &downcast<HTMLCanvasElement>(base);
}
bool ImageBitmapRenderingContext::isAccelerated() const
{
return false;
}
void ImageBitmapRenderingContext::setOutputBitmap(RefPtr<ImageBitmap> imageBitmap)
{
// 1. If a bitmap argument was not provided, then:
if (!imageBitmap) {
// 1.1. Set context's bitmap mode to blank.
m_bitmapMode = BitmapMode::Blank;
// 1.2. Let canvas be the canvas element to which context is bound.
// 1.3. Set context's output bitmap to be transparent black with an
// intrinsic width equal to the numeric value of canvas's width attribute
// and an intrinsic height equal to the numeric value of canvas's height
// attribute, those values being interpreted in CSS pixels.
// FIXME: What is the point of creating a full size transparent buffer that
// can never be changed? Wouldn't a 1x1 buffer give the same rendering? The
// only reason I can think of is toDataURL(), but that doesn't seem like
// a good enough argument to waste memory.
auto buffer = ImageBuffer::create(FloatSize(canvasBase().width(), canvasBase().height()), RenderingPurpose::Unspecified, 1, DestinationColorSpace::SRGB(), PixelFormat::BGRA8, bufferOptionsForRendingMode(RenderingMode::Unaccelerated));
canvasBase().setImageBufferAndMarkDirty(WTFMove(buffer));
// 1.4. Set the output bitmap's origin-clean flag to true.
canvasBase().setOriginClean();
return;
}
// 2. If a bitmap argument was provided, then:
// 2.1. Set context's bitmap mode to valid.
m_bitmapMode = BitmapMode::Valid;
// 2.2. Set context's output bitmap to refer to the same underlying
// bitmap data as bitmap, without making a copy.
// Note: the origin-clean flag of bitmap is included in the
// bitmap data to be referenced by context's output bitmap.
if (imageBitmap->originClean())
canvasBase().setOriginClean();
else
canvasBase().setOriginTainted();
canvasBase().setImageBufferAndMarkDirty(imageBitmap->takeImageBuffer());
}
ExceptionOr<void> ImageBitmapRenderingContext::transferFromImageBitmap(RefPtr<ImageBitmap> imageBitmap)
{
// 1. Let bitmapContext be the ImageBitmapRenderingContext object on which
// the transferFromImageBitmap() method was called.
// 2. If imageBitmap is null, then run the steps to set an ImageBitmapRenderingContext's
// output bitmap, with bitmapContext as the context argument and no bitmap argument,
// then abort these steps.
if (!imageBitmap) {
setOutputBitmap(nullptr);
return { };
}
// 3. If the value of imageBitmap's [[Detached]] internal slot is set to true,
// then throw an "InvalidStateError" DOMException and abort these steps.
if (imageBitmap->isDetached())
return Exception { InvalidStateError };
// 4. Run the steps to set an ImageBitmapRenderingContext's output bitmap,
// with the context argument equal to bitmapContext, and the bitmap
// argument referring to imageBitmap's underlying bitmap data.
setOutputBitmap(imageBitmap);
// 5. Set the value of imageBitmap's [[Detached]] internal slot to true.
// 6. Unset imageBitmap's bitmap data.
// Note that the algorithm in the specification is currently a bit
// muddy here. The setOutputBitmap step above had to transfer ownership
// from the imageBitmap to this object, which requires a detach and unset,
// so this step isn't necessary, but we'll do it anyway.
imageBitmap->close();
return { };
}
}
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