| /* |
| * Copyright (C) Research In Motion Limited 2010-2012. 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/svg/SVGTextMetrics.h" |
| |
| #include "core/rendering/svg/RenderSVGInlineText.h" |
| |
| namespace blink { |
| |
| SVGTextMetrics::SVGTextMetrics() |
| : m_width(0) |
| , m_height(0) |
| , m_length(0) |
| { |
| } |
| |
| SVGTextMetrics::SVGTextMetrics(SVGTextMetrics::MetricsType) |
| : m_width(0) |
| , m_height(0) |
| , m_length(1) |
| { |
| } |
| |
| SVGTextMetrics::SVGTextMetrics(RenderSVGInlineText* textRenderer, const TextRun& run) |
| { |
| ASSERT(textRenderer); |
| |
| float scalingFactor = textRenderer->scalingFactor(); |
| ASSERT(scalingFactor); |
| |
| const Font& scaledFont = textRenderer->scaledFont(); |
| |
| // Calculate width/height using the scaled font, divide this result by the scalingFactor afterwards. |
| m_width = scaledFont.width(run) / scalingFactor; |
| m_height = scaledFont.fontMetrics().floatHeight() / scalingFactor; |
| |
| ASSERT(run.length() >= 0); |
| m_length = static_cast<unsigned>(run.length()); |
| } |
| |
| TextRun SVGTextMetrics::constructTextRun(RenderSVGInlineText* text, unsigned position, unsigned length) |
| { |
| ASSERT(text->style()); |
| return constructTextRun(text, position, length, text->style()->direction()); |
| } |
| |
| TextRun SVGTextMetrics::constructTextRun(RenderSVGInlineText* text, unsigned position, unsigned length, TextDirection textDirection) |
| { |
| RenderStyle* style = text->style(); |
| ASSERT(style); |
| |
| TextRun run(static_cast<const LChar*>(0) // characters, will be set below if non-zero. |
| , 0 // length, will be set below if non-zero. |
| , 0 // xPos, only relevant with allowTabs=true |
| , 0 // padding, only relevant for justified text, not relevant for SVG |
| , TextRun::AllowTrailingExpansion |
| , textDirection |
| , isOverride(style->unicodeBidi()) /* directionalOverride */); |
| |
| if (length) { |
| if (text->is8Bit()) |
| run.setText(text->characters8() + position, length); |
| else |
| run.setText(text->characters16() + position, length); |
| } |
| |
| // We handle letter & word spacing ourselves. |
| run.disableSpacing(); |
| |
| // Propagate the maximum length of the characters buffer to the TextRun, even when we're only processing a substring. |
| run.setCharactersLength(text->textLength() - position); |
| ASSERT(run.charactersLength() >= run.length()); |
| return run; |
| } |
| |
| SVGTextMetrics SVGTextMetrics::measureCharacterRange(RenderSVGInlineText* text, unsigned position, unsigned length, TextDirection textDirection) |
| { |
| ASSERT(text); |
| return SVGTextMetrics(text, constructTextRun(text, position, length, textDirection)); |
| } |
| |
| SVGTextMetrics SVGTextMetrics::measureCharacterRange(RenderSVGInlineText* text, unsigned position, unsigned length) |
| { |
| ASSERT(text); |
| return SVGTextMetrics(text, constructTextRun(text, position, length)); |
| } |
| |
| SVGTextMetrics::SVGTextMetrics(RenderSVGInlineText* text, unsigned position, unsigned length, float width) |
| { |
| ASSERT(text); |
| |
| float scalingFactor = text->scalingFactor(); |
| ASSERT(scalingFactor); |
| |
| m_width = width / scalingFactor; |
| m_height = text->scaledFont().fontMetrics().floatHeight() / scalingFactor; |
| |
| m_length = length; |
| } |
| |
| } |