Source/platform/graphics/paint/Transform3DDisplayItem.cpp

// 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 "platform/graphics/paint/Transform3DDisplayItem.h"

#include "platform/graphics/GraphicsContext.h"
#include "platform/transforms/AffineTransform.h"
#include "public/platform/WebDisplayItemList.h"

namespace blink {

void BeginTransform3DDisplayItem::replay(GraphicsContext& context)
{
    TransformationMatrix transform(m_transform);
    transform.applyTransformOrigin(m_transformOrigin);
    context.save();
    context.concatCTM(transform.toAffineTransform());
}

void BeginTransform3DDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
{
    // TODO(jbroman): The compositor will need the transform origin separately.
    TransformationMatrix transform(m_transform);
    transform.applyTransformOrigin(m_transformOrigin);
    list->appendTransformItem(TransformationMatrix::toSkMatrix44(transform));
}

#ifndef NDEBUG
void BeginTransform3DDisplayItem::dumpPropertiesAsDebugString(WTF::StringBuilder& stringBuilder) const
{
    PairedBeginDisplayItem::dumpPropertiesAsDebugString(stringBuilder);
    TransformationMatrix::DecomposedType decomposition;
    if (m_transform.decompose(decomposition)) {
        stringBuilder.append(WTF::String::format(
            ", translate: [%lf,%lf,%lf], scale: [%lf,%lf,%lf], skew: [%lf,%lf,%lf], quarternion: [%lf,%lf,%lf,%lf], perspective: [%lf,%lf,%lf,%lf]",
            decomposition.translateX, decomposition.translateY, decomposition.translateZ,
            decomposition.scaleX, decomposition.scaleY, decomposition.scaleZ,
            decomposition.skewXY, decomposition.skewXZ, decomposition.skewYZ,
            decomposition.quaternionX, decomposition.quaternionY, decomposition.quaternionZ, decomposition.quaternionW,
            decomposition.perspectiveX, decomposition.perspectiveY, decomposition.perspectiveZ, decomposition.perspectiveW));
    }
    stringBuilder.append(String::format(", transformOrigin: [%f,%f,%f]", m_transformOrigin.x(), m_transformOrigin.y(), m_transformOrigin.z()));
}
#endif

void EndTransform3DDisplayItem::replay(GraphicsContext& context)
{
    context.restore();
}

void EndTransform3DDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
{
    list->appendEndTransformItem();
}

} // namespace blink