flutter_flutter/sky/engine/core/rendering/RenderTreeAsText.cpp

/*
 * Copyright (C) 2004, 2006, 2007 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 COMPUTER, 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 COMPUTER, 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 "flutter/sky/engine/core/rendering/RenderTreeAsText.h"

#include "flutter/sky/engine/core/rendering/InlineTextBox.h"
#include "flutter/sky/engine/core/rendering/RenderInline.h"
#include "flutter/sky/engine/core/rendering/RenderLayer.h"
#include "flutter/sky/engine/core/rendering/RenderView.h"
#include "flutter/sky/engine/wtf/HexNumber.h"
#include "flutter/sky/engine/wtf/Vector.h"
#include "flutter/sky/engine/wtf/unicode/CharacterNames.h"

namespace blink {

String quoteAndEscapeNonPrintables(const String& s)
{
    StringBuilder result;
    result.append('"');
    for (unsigned i = 0; i != s.length(); ++i) {
        UChar c = s[i];
        if (c == '\\') {
            result.append('\\');
            result.append('\\');
        } else if (c == '"') {
            result.append('\\');
            result.append('"');
        } else if (c == '\n' || c == noBreakSpace)
            result.append(' ');
        else {
            if (c >= 0x20 && c < 0x7F)
                result.append(c);
            else {
                result.append('\\');
                result.append('x');
                result.append('{');
                appendUnsignedAsHex(c, result);
                result.append('}');
            }
        }
    }
    result.append('"');
    return result.toString();
}

void RenderTreeAsText::writeRenderObject(TextStream& ts, const RenderObject& o, RenderAsTextBehavior behavior)
{
}

static void writeTextRun(TextStream& ts, const RenderText& o, const InlineTextBox& run)
{
    // FIXME: For now use an "enclosingIntRect" model for x, y and logicalWidth, although this makes it harder
    // to detect any changes caused by the conversion to floating point. :(
    int x = run.x();
    int y = run.y();
    int logicalWidth = ceilf(run.left() + run.logicalWidth()) - x;

    ts << "text run at (" << x << "," << y << ") width " << logicalWidth;
    if (!run.isLeftToRightDirection() || run.dirOverride()) {
        ts << (!run.isLeftToRightDirection() ? " RTL" : " LTR");
        if (run.dirOverride())
            ts << " override";
    }
    ts << ": "
        << quoteAndEscapeNonPrintables(String(o.text()).substring(run.start(), run.len()));
    if (run.hasHyphen())
        ts << " + hyphen string " << quoteAndEscapeNonPrintables(o.style()->hyphenString());
    ts << "\n";
}

void write(TextStream& ts, const RenderObject& o, int indent, RenderAsTextBehavior behavior)
{
    writeIndent(ts, indent);

    RenderTreeAsText::writeRenderObject(ts, o, behavior);
    ts << "\n";

    if (o.isText()) {
        const RenderText& text = toRenderText(o);
        for (InlineTextBox* box = text.firstTextBox(); box; box = box->nextTextBox()) {
            writeIndent(ts, indent + 1);
            writeTextRun(ts, text, *box);
        }
    }

    for (RenderObject* child = o.slowFirstChild(); child; child = child->nextSibling()) {
        if (child->hasLayer())
            continue;
        write(ts, *child, indent + 1, behavior);
    }
}

static void write(TextStream& ts, RenderLayer& l,
                  const LayoutRect& layerBounds, const LayoutRect& backgroundClipRect,
                  int indent = 0, RenderAsTextBehavior behavior = RenderAsTextBehaviorNormal)
{
    IntRect adjustedLayoutBounds = pixelSnappedIntRect(layerBounds);
    IntRect adjustedBackgroundClipRect = pixelSnappedIntRect(backgroundClipRect);

    writeIndent(ts, indent);

    ts << "layer ";

    if (behavior & RenderAsTextShowAddresses)
        ts << static_cast<const void*>(&l) << " ";

    ts << adjustedLayoutBounds;

    if (!adjustedLayoutBounds.isEmpty()) {
        if (!adjustedBackgroundClipRect.contains(adjustedLayoutBounds))
            ts << " backgroundClip " << adjustedBackgroundClipRect;
    }

    ts << "\n";
    write(ts, *l.renderer(), indent + 1, behavior);
}

void RenderTreeAsText::writeLayers(TextStream& ts, const RenderLayer* rootLayer, RenderLayer* layer,
    const LayoutRect& paintRect, int indent, RenderAsTextBehavior behavior)
{
    // FIXME: Apply overflow to the root layer to not break every test. Complete hack. Sigh.
    LayoutRect paintDirtyRect(paintRect);
    if (rootLayer == layer) {
        paintDirtyRect.setWidth(max<LayoutUnit>(paintDirtyRect.width(), rootLayer->renderer()->layoutOverflowRect().maxX()));
        paintDirtyRect.setHeight(max<LayoutUnit>(paintDirtyRect.height(), rootLayer->renderer()->layoutOverflowRect().maxY()));
    }

    // Calculate the clip rects we should use.
    LayoutRect layerBounds;
    ClipRect damageRect;
    layer->clipper().calculateRects(ClipRectsContext(rootLayer, UncachedClipRects), paintDirtyRect, layerBounds, damageRect);

    // FIXME: Apply overflow to the root layer to not break every test. Complete hack. Sigh.
    if (rootLayer == layer)
        layerBounds.setSize(layer->size().expandedTo(pixelSnappedIntSize(layer->renderer()->maxLayoutOverflow(), LayoutPoint(0, 0))));

    // Ensure our lists are up-to-date.
    layer->stackingNode()->updateLayerListsIfNeeded();

    bool shouldPaint = (behavior & RenderAsTextShowAllLayers) ? true : layer->intersectsDamageRect(layerBounds, damageRect.rect(), rootLayer);

    if (shouldPaint)
        write(ts, *layer, layerBounds, damageRect.rect(), indent, behavior);

    if (Vector<RenderLayerStackingNode*>* normalFlowList = layer->stackingNode()->normalFlowList()) {
        int currIndent = indent;
        if (behavior & RenderAsTextShowLayerNesting) {
            writeIndent(ts, indent);
            ts << " normal flow list(" << normalFlowList->size() << ")\n";
            ++currIndent;
        }
        for (unsigned i = 0; i != normalFlowList->size(); ++i)
            writeLayers(ts, rootLayer, normalFlowList->at(i)->layer(), paintDirtyRect, currIndent, behavior);
    }

    if (Vector<RenderLayerStackingNode*>* posList = layer->stackingNode()->zOrderList()) {
        int currIndent = indent;
        if (behavior & RenderAsTextShowLayerNesting) {
            writeIndent(ts, indent);
            ts << " positive z-order list(" << posList->size() << ")\n";
            ++currIndent;
        }
        for (unsigned i = 0; i != posList->size(); ++i)
            writeLayers(ts, rootLayer, posList->at(i)->layer(), paintDirtyRect, currIndent, behavior);
    }
}

} // namespace blink