Rename RenderText to LayoutText

Source/core/rendering/RenderCombineText.cpp

-/*
- * Copyright (C) 2011 Apple Inc. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#include "config.h"
-#include "core/rendering/RenderCombineText.h"
-
-#include "core/layout/TextRunConstructor.h"
-#include "platform/graphics/GraphicsContext.h"
-
-namespace blink {
-
-const float textCombineMargin = 1.1f; // Allow em + 10% margin
-
-RenderCombineText::RenderCombineText(Node* node, PassRefPtr<StringImpl> string)
-    : RenderText(node, string)
-    , m_combinedTextWidth(0)
-    , m_scaleX(1.0f)
-    , m_isCombined(false)
-    , m_needsFontUpdate(false)
-{
-}
-
-void RenderCombineText::styleDidChange(StyleDifference diff, const LayoutStyle* oldStyle)
-{
-    setStyleInternal(LayoutStyle::clone(styleRef()));
-    RenderText::styleDidChange(diff, oldStyle);
-
-    updateIsCombined();
-}
-
-void RenderCombineText::setTextInternal(PassRefPtr<StringImpl> text)
-{
-    RenderText::setTextInternal(text);
-
-    updateIsCombined();
-}
-
-float RenderCombineText::width(unsigned from, unsigned length, const Font& font, float xPosition, TextDirection direction, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
-{
-    if (!length)
-        return 0;
-
-    if (hasEmptyText())
-        return 0;
-
-    if (m_isCombined)
-        return font.fontDescription().computedSize();
-
-    return RenderText::width(from, length, font, xPosition, direction, fallbackFonts, glyphOverflow);
-}
-
-void scaleHorizontallyAndTranslate(GraphicsContext& context, float scaleX, float centerX, float offsetX, float offsetY)
-{
-    context.concatCTM(AffineTransform(scaleX, 0, 0, 1, centerX * (1.0f - scaleX) + offsetX * scaleX, offsetY));
-}
-
-void RenderCombineText::transformToInlineCoordinates(GraphicsContext& context, const FloatRect& boxRect) const
-{
-    ASSERT(!m_needsFontUpdate);
-    ASSERT(m_isCombined);
-    if (m_scaleX >= 1.0f) {
-        // Fast path, more than 90% of cases
-        ASSERT(m_scaleX == 1.0f);
-        context.concatCTM(AffineTransform::translation(offsetXNoScale(boxRect), offsetY()));
-        return;
-    }
-    ASSERT(m_scaleX > 0.0f);
-    const float centerX = boxRect.x() + boxRect.width() / 2;
-    scaleHorizontallyAndTranslate(context, m_scaleX, centerX, offsetX(boxRect), offsetY());
-}
-
-void RenderCombineText::transformLayoutRect(FloatRect& boxRect) const
-{
-    ASSERT(!m_needsFontUpdate);
-    ASSERT(m_isCombined);
-    boxRect.move(offsetXNoScale(boxRect), offsetY());
-}
-
-void RenderCombineText::updateIsCombined()
-{
-    // CSS3 spec says text-combine works only in vertical writing mode.
-    m_isCombined = !style()->isHorizontalWritingMode()
-        // Nothing to combine.
-        && !hasEmptyText();
-
-    if (m_isCombined)
-        m_needsFontUpdate = true;
-}
-
-void RenderCombineText::updateFont()
-{
-    if (!m_needsFontUpdate)
-        return;
-
-    m_needsFontUpdate = false;
-
-    if (!m_isCombined)
-        return;
-
-    TextRun run = constructTextRun(this, originalFont(), this, styleRef(), style()->direction());
-    FontDescription description = originalFont().fontDescription();
-    float emWidth = description.computedSize();
-    if (!(style()->textDecorationsInEffect() & (TextDecorationUnderline | TextDecorationOverline)))
-        emWidth *= textCombineMargin;
-
-    description.setOrientation(Horizontal); // We are going to draw combined text horizontally.
-    m_combinedTextWidth = originalFont().width(run);
-
-    FontSelector* fontSelector = style()->font().fontSelector();
-
-    bool shouldUpdateFont = style()->setFontDescription(description); // Need to change font orientation to horizontal.
-
-    if (m_combinedTextWidth <= emWidth) {
-        m_scaleX = 1.0f;
-    } else {
-        // Need to try compressed glyphs.
-        static const FontWidthVariant widthVariants[] = { HalfWidth, ThirdWidth, QuarterWidth };
-        for (size_t i = 0 ; i < WTF_ARRAY_LENGTH(widthVariants) ; ++i) {
-            description.setWidthVariant(widthVariants[i]);
-            Font compressedFont = Font(description);
-            compressedFont.update(fontSelector);
-            float runWidth = compressedFont.width(run);
-            if (runWidth <= emWidth) {
-                m_combinedTextWidth = runWidth;
-
-                // Replace my font with the new one.
-                shouldUpdateFont = style()->setFontDescription(description);
-                break;
-            }
-        }
-
-        // If width > ~1em, shrink to fit within ~1em, otherwise render without scaling (no expansion)
-        // http://dev.w3.org/csswg/css-writing-modes-3/#text-combine-compression
-        if (m_combinedTextWidth > emWidth) {
-            m_scaleX = emWidth / m_combinedTextWidth;
-            m_combinedTextWidth = emWidth;
-        } else {
-            m_scaleX = 1.0f;
-        }
-    }
-
-    if (shouldUpdateFont)
-        style()->font().update(fontSelector);
-}
-
-} // namespace blink