/* * Copyright (C) 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. * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "config.h" #include "Font.h" #include "FontCache.h" #include "SimpleFontData.h" #include "FloatRect.h" #include "FontDescription.h" #include #include #include #include #include "webkit/glue/webkit_glue.h" namespace WebCore { static inline float scaleEmToUnits(float x, int unitsPerEm) { return unitsPerEm ? x / (float)unitsPerEm : x; } void SimpleFontData::platformInit() { HDC dc = GetDC(0); HGDIOBJ oldFont = SelectObject(dc, m_font.hfont()); m_isSystemFont = false; TEXTMETRIC tm = {0}; if (!GetTextMetrics(dc, &tm)) { if (webkit_glue::EnsureFontLoaded(m_font.hfont())) { // Retry GetTextMetrics. // TODO(nsylvain): Handle gracefully the error if this call also // fails. // See bug 1136944. if (!GetTextMetrics(dc, &tm)) { ASSERT_NOT_REACHED(); } } } m_avgCharWidth = tm.tmAveCharWidth; m_maxCharWidth = tm.tmMaxCharWidth; m_ascent = tm.tmAscent; m_descent = tm.tmDescent; m_lineGap = tm.tmExternalLeading; m_xHeight = m_ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts. OUTLINETEXTMETRIC otm; if (GetOutlineTextMetrics(dc, sizeof(otm), &otm) > 0) { // This is a TrueType font. We might be able to get an accurate xHeight. GLYPHMETRICS gm = {0}; MAT2 mat = {{0, 1}, {0, 0}, {0, 0}, {0, 1}}; // The identity matrix. DWORD len = GetGlyphOutlineW(dc, 'x', GGO_METRICS, &gm, 0, 0, &mat); if (len != GDI_ERROR && gm.gmBlackBoxY > 0) m_xHeight = static_cast(gm.gmBlackBoxY); } m_lineSpacing = m_ascent + m_descent + m_lineGap; SelectObject(dc, oldFont); ReleaseDC(0, dc); // Uniscribe will allocate this for us, and expects it to be initialized to // NULL. m_scriptCache = 0; // It's unclear why this variable is a pointer. m_scriptFontProperties = 0; } void SimpleFontData::platformDestroy() { if (m_font.isMLangFont()) { // We have to release the font instead of just deleting it, since we // didn't make it. // // TODO(brettw): bug 1072298: This should be removed when we remove // IMLangFontLink2 support. I think this is incorrect, as it will delete // the font out from under any other PlatformData structures that share // the same internal refcounted objects. IMLangFontLink2* langFontLink = FontCache::getFontLinkInterface(); if (langFontLink) langFontLink->ReleaseFont(m_font.hfont()); } // We don't hash this on Win32, so it's effectively owned by us. delete m_smallCapsFontData; m_smallCapsFontData = NULL; ScriptFreeCache(&m_scriptCache); delete m_scriptFontProperties; } SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const { if (!m_smallCapsFontData) { LOGFONT winfont; GetObject(m_font.hfont(), sizeof(LOGFONT), &winfont); float smallCapsSize = 0.70f * fontDescription.computedSize(); // Unlike WebKit trunk, we don't multiply the size by 32. That seems // to be some kind of artifact of their CG backend, or something. winfont.lfHeight = -lroundf(smallCapsSize); HFONT hfont = CreateFontIndirect(&winfont); m_smallCapsFontData = new SimpleFontData(FontPlatformData(hfont, smallCapsSize, false)); } return m_smallCapsFontData; } bool SimpleFontData::containsCharacters(const UChar* characters, int length) const { // FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC // merely by testing code page intersection. This seems suspect though. Can't a font only partially // cover a given code page? IMLangFontLink2* langFontLink = FontCache::getFontLinkInterface(); if (!langFontLink) return false; HDC dc = GetDC((HWND)0); DWORD acpCodePages; langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages); DWORD fontCodePages; langFontLink->GetFontCodePages(dc, m_font.hfont(), &fontCodePages); DWORD actualCodePages; long numCharactersProcessed; long offset = 0; while (offset < length) { langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed); if ((actualCodePages & fontCodePages) == 0) return false; offset += numCharactersProcessed; } ReleaseDC(0, dc); return true; } void SimpleFontData::determinePitch() { // TEXTMETRICS have this. Set m_treatAsFixedPitch based off that. HDC dc = GetDC((HWND)0); HGDIOBJ oldFont = SelectObject(dc, m_font.hfont()); // Yes, this looks backwards, but the fixed pitch bit is actually set if the font // is *not* fixed pitch. Unbelievable but true. TEXTMETRIC tm = {0}; if (!GetTextMetrics(dc, &tm)) { if (webkit_glue::EnsureFontLoaded(m_font.hfont())) { // Retry GetTextMetrics. // TODO(nsylvain): Handle gracefully the error if this call also fails. // See bug 1136944. if (!GetTextMetrics(dc, &tm)) { ASSERT_NOT_REACHED(); } } } m_treatAsFixedPitch = ((tm.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0); SelectObject(dc, oldFont); ReleaseDC(0, dc); } float SimpleFontData::platformWidthForGlyph(Glyph glyph) const { HDC dc = GetDC(0); HGDIOBJ oldFont = SelectObject(dc, m_font.hfont()); int width = 0; if (!GetCharWidthI(dc, glyph, 1, 0, &width)) { // Ask the browser to preload the font and retry. if (webkit_glue::EnsureFontLoaded(m_font.hfont())) { if (!GetCharWidthI(dc, glyph, 1, 0, &width)) { ASSERT_NOT_REACHED(); } } } SelectObject(dc, oldFont); ReleaseDC(0, dc); return static_cast(width); } SCRIPT_FONTPROPERTIES* SimpleFontData::scriptFontProperties() const { if (!m_scriptFontProperties) { m_scriptFontProperties = new SCRIPT_FONTPROPERTIES; memset(m_scriptFontProperties, 0, sizeof(SCRIPT_FONTPROPERTIES)); m_scriptFontProperties->cBytes = sizeof(SCRIPT_FONTPROPERTIES); HRESULT result = ScriptGetFontProperties(0, scriptCache(), m_scriptFontProperties); if (result == E_PENDING) { HDC dc = GetDC(0); HGDIOBJ oldFont = SelectObject(dc, m_font.hfont()); HRESULT hr = ScriptGetFontProperties(dc, scriptCache(), m_scriptFontProperties); if (S_OK != hr) { if (webkit_glue::EnsureFontLoaded(m_font.hfont())) { // Retry ScriptGetFontProperties. // TODO(nsylvain): Handle gracefully the error if this call // also fails. See bug 1136944. hr = ScriptGetFontProperties(dc, scriptCache(), m_scriptFontProperties); if (S_OK != hr) { ASSERT_NOT_REACHED(); } } } SelectObject(dc, oldFont); ReleaseDC(0, dc); } } return m_scriptFontProperties; } }