1/* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include "config.h" 32#include "web/WebFontImpl.h" 33 34#include "platform/fonts/FontCache.h" 35#include "platform/fonts/FontDescription.h" 36#include "platform/graphics/GraphicsContext.h" 37#include "platform/text/TextRun.h" 38#include "public/platform/WebFloatPoint.h" 39#include "public/platform/WebFloatRect.h" 40#include "public/platform/WebRect.h" 41#include "public/web/WebFontDescription.h" 42#include "public/web/WebTextRun.h" 43#include <skia/ext/platform_canvas.h> 44 45using namespace WebCore; 46 47namespace blink { 48 49WebFont* WebFont::create(const WebFontDescription& desc) 50{ 51 return new WebFontImpl(desc); 52} 53 54WebFontImpl::WebFontImpl(const FontDescription& desc) 55 : m_font(desc) 56{ 57 m_font.update(nullptr); 58} 59 60WebFontDescription WebFontImpl::fontDescription() const 61{ 62 return WebFontDescription(m_font.fontDescription()); 63} 64 65int WebFontImpl::ascent() const 66{ 67 return m_font.fontMetrics().ascent(); 68} 69 70int WebFontImpl::descent() const 71{ 72 return m_font.fontMetrics().descent(); 73} 74 75int WebFontImpl::height() const 76{ 77 return m_font.fontMetrics().height(); 78} 79 80int WebFontImpl::lineSpacing() const 81{ 82 return m_font.fontMetrics().lineSpacing(); 83} 84 85float WebFontImpl::xHeight() const 86{ 87 return m_font.fontMetrics().xHeight(); 88} 89 90void WebFontImpl::drawText(WebCanvas* canvas, const WebTextRun& run, const WebFloatPoint& leftBaseline, 91 WebColor color, const WebRect& clip, bool canvasIsOpaque, 92 int from, int to) const 93{ 94 FontCachePurgePreventer fontCachePurgePreventer; 95 WebCore::FloatRect textClipRect(clip); 96 TextRun textRun(run); 97 TextRunPaintInfo runInfo(textRun); 98 runInfo.from = from; 99 runInfo.to = to == -1 ? textRun.length() : to; 100 runInfo.bounds = textClipRect; 101 GraphicsContext gc(canvas); 102 103 gc.save(); 104 gc.setCertainlyOpaque(canvasIsOpaque); 105 gc.setFillColor(color); 106 gc.clip(textClipRect); 107 m_font.drawText(&gc, runInfo, leftBaseline); 108 gc.restore(); 109} 110 111int WebFontImpl::calculateWidth(const WebTextRun& run) const 112{ 113 FontCachePurgePreventer fontCachePurgePreventer; 114 return m_font.width(run, 0); 115} 116 117int WebFontImpl::offsetForPosition(const WebTextRun& run, float position) const 118{ 119 FontCachePurgePreventer fontCachePurgePreventer; 120 return m_font.offsetForPosition(run, position, true); 121} 122 123WebFloatRect WebFontImpl::selectionRectForText(const WebTextRun& run, const WebFloatPoint& leftBaseline, int height, int from, int to) const 124{ 125 FontCachePurgePreventer fontCachePurgePreventer; 126 return m_font.selectionRectForText(run, leftBaseline, height, from, to); 127} 128 129} // namespace blink 130