| /* |
| * Copyright (C) Research In Motion Limited 2010. 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" |
| |
| #if ENABLE(SVG) |
| #include "SVGTextMetrics.h" |
| |
| #include "RenderSVGInlineText.h" |
| #include "TextRun.h" |
| |
| namespace WebCore { |
| |
| SVGTextMetrics::SVGTextMetrics() |
| : m_width(0) |
| , m_height(0) |
| , m_length(0) |
| { |
| } |
| |
| SVGTextMetrics::SVGTextMetrics(RenderSVGInlineText* textRenderer, const TextRun& run, unsigned position, unsigned textLength) |
| { |
| ASSERT(textRenderer); |
| |
| float scalingFactor = textRenderer->scalingFactor(); |
| ASSERT(scalingFactor); |
| |
| const Font& scaledFont = textRenderer->scaledFont(); |
| |
| int extraCharsAvailable = textLength - (position + run.length()); |
| int length = 0; |
| |
| // Calculate width/height using the scaled font, divide this result by the scalingFactor afterwards. |
| m_width = scaledFont.width(run, extraCharsAvailable, length, m_glyph.name) / scalingFactor; |
| m_height = scaledFont.fontMetrics().floatHeight() / scalingFactor; |
| |
| m_glyph.unicodeString = String(run.characters(), length); |
| m_glyph.isValid = true; |
| |
| ASSERT(length >= 0); |
| m_length = static_cast<unsigned>(length); |
| } |
| |
| bool SVGTextMetrics::operator==(const SVGTextMetrics& other) |
| { |
| return m_width == other.m_width |
| && m_height == other.m_height |
| && m_length == other.m_length |
| && m_glyph == other.m_glyph; |
| } |
| |
| SVGTextMetrics SVGTextMetrics::emptyMetrics() |
| { |
| DEFINE_STATIC_LOCAL(SVGTextMetrics, s_emptyMetrics, ()); |
| s_emptyMetrics.m_length = 1; |
| return s_emptyMetrics; |
| } |
| |
| static TextRun constructTextRun(RenderSVGInlineText* text, const UChar* characters, unsigned position, unsigned length) |
| { |
| RenderStyle* style = text->style(); |
| ASSERT(style); |
| |
| TextRun run(characters + position |
| , length |
| , false /* allowTabs */ |
| , 0 /* xPos, only relevant with allowTabs=true */ |
| , 0 /* padding, only relevant for justified text, not relevant for SVG */ |
| , TextRun::AllowTrailingExpansion |
| , !style->isLeftToRightDirection() |
| , style->unicodeBidi() == Override /* directionalOverride */); |
| |
| #if ENABLE(SVG_FONTS) |
| run.setReferencingRenderObject(text); |
| #endif |
| |
| // We handle letter & word spacing ourselves. |
| run.disableSpacing(); |
| return run; |
| } |
| |
| SVGTextMetrics SVGTextMetrics::measureCharacterRange(RenderSVGInlineText* text, unsigned position, unsigned length) |
| { |
| ASSERT(text); |
| TextRun run(constructTextRun(text, text->characters(), position, length)); |
| return SVGTextMetrics(text, run, position, text->textLength()); |
| } |
| |
| } |
| |
| #endif // ENABLE(SVG) |