| /* |
| * Copyright (C) 2006, 2007 Apple Inc. All Rights Reserved. |
| * Copyright (c) 2008, 2009, Google 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT |
| * OWNER OR 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 "core/platform/graphics/SimpleFontData.h" |
| |
| #include <mlang.h> |
| #include <objidl.h> |
| #include <unicode/uchar.h> |
| #include <unicode/unorm.h> |
| #include "core/platform/graphics/Font.h" |
| #include "core/platform/graphics/FontCache.h" |
| #include "core/platform/graphics/chromium/FontPlatformDataChromiumWin.h" |
| #include "platform/fonts/FontDescription.h" |
| #include "platform/geometry/FloatRect.h" |
| #include "platform/win/HWndDC.h" |
| #include "wtf/MathExtras.h" |
| |
| namespace WebCore { |
| |
| void SimpleFontData::platformInit() |
| { |
| if (!m_platformData.size()) { |
| m_fontMetrics.reset(); |
| m_avgCharWidth = 0; |
| m_maxCharWidth = 0; |
| return; |
| } |
| |
| HWndDC dc(0); |
| HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont()); |
| |
| TEXTMETRIC textMetric = {0}; |
| if (!GetTextMetrics(dc, &textMetric)) { |
| if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) { |
| // Retry GetTextMetrics. |
| // FIXME: Handle gracefully the error if this call also fails. |
| // See http://crbug.com/6401. |
| if (!GetTextMetrics(dc, &textMetric)) |
| LOG_ERROR("Unable to get the text metrics after second attempt"); |
| } |
| } |
| |
| m_avgCharWidth = textMetric.tmAveCharWidth; |
| m_maxCharWidth = textMetric.tmMaxCharWidth; |
| |
| // FIXME: Access ascent/descent/lineGap with floating point precision. |
| float ascent = textMetric.tmAscent; |
| float descent = textMetric.tmDescent; |
| float lineGap = textMetric.tmExternalLeading; |
| float xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts. |
| |
| OUTLINETEXTMETRIC outlineTextMetric; |
| if (GetOutlineTextMetrics(dc, sizeof(outlineTextMetric), &outlineTextMetric) > 0) { |
| m_fontMetrics.setUnitsPerEm(outlineTextMetric.otmEMSquare); |
| |
| // This is a TrueType font. We might be able to get an accurate xHeight. |
| GLYPHMETRICS glyphMetrics = {0}; |
| MAT2 identityMatrix = {{0, 1}, {0, 0}, {0, 0}, {0, 1}}; |
| DWORD len = GetGlyphOutlineW(dc, 'x', GGO_METRICS, &glyphMetrics, 0, 0, &identityMatrix); |
| if (len != GDI_ERROR && glyphMetrics.gmBlackBoxY > 0) |
| xHeight = static_cast<float>(glyphMetrics.gmBlackBoxY); |
| } |
| |
| m_fontMetrics.setAscent(ascent); |
| m_fontMetrics.setDescent(descent); |
| m_fontMetrics.setLineGap(lineGap); |
| m_fontMetrics.setXHeight(xHeight); |
| m_fontMetrics.setLineSpacing(ascent + descent + lineGap); |
| |
| SelectObject(dc, oldFont); |
| } |
| |
| void SimpleFontData::platformCharWidthInit() |
| { |
| // charwidths are set in platformInit. |
| } |
| |
| void SimpleFontData::platformDestroy() |
| { |
| } |
| |
| PassRefPtr<SimpleFontData> SimpleFontData::platformCreateScaledFontData(const FontDescription& fontDescription, float scaleFactor) const |
| { |
| LOGFONT winFont; |
| GetObject(m_platformData.hfont(), sizeof(LOGFONT), &winFont); |
| float scaledSize = scaleFactor * fontDescription.computedSize(); |
| winFont.lfHeight = -lroundf(scaledSize); |
| HFONT hfont = CreateFontIndirect(&winFont); |
| return SimpleFontData::create(FontPlatformData(hfont, scaledSize, m_platformData.orientation()), isCustomFont(), false); |
| } |
| |
| bool SimpleFontData::containsCharacters(const UChar* characters, int length) const |
| { |
| // This used to be implemented with IMLangFontLink2, but since that code has |
| // been disabled, this would always return false anyway. |
| return false; |
| } |
| |
| void SimpleFontData::determinePitch() |
| { |
| m_treatAsFixedPitch = platformData().isFixedPitch(); |
| } |
| |
| FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const |
| { |
| HWndDC hdc(0); |
| SetGraphicsMode(hdc, GM_ADVANCED); |
| HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont()); |
| |
| GLYPHMETRICS gdiMetrics; |
| static const MAT2 identity = { 0, 1, 0, 0, 0, 0, 0, 1 }; |
| if (GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity) == -1) { |
| if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) { |
| // Retry GetTextMetrics. |
| // FIXME: Handle gracefully the error if this call also fails. |
| // See http://crbug.com/6401. |
| if (GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity) == -1) |
| LOG_ERROR("Unable to get the glyph metrics after second attempt"); |
| } |
| } |
| |
| SelectObject(hdc, oldFont); |
| |
| return FloatRect(gdiMetrics.gmptGlyphOrigin.x, -gdiMetrics.gmptGlyphOrigin.y, |
| gdiMetrics.gmBlackBoxX, gdiMetrics.gmBlackBoxY); |
| } |
| |
| float SimpleFontData::platformWidthForGlyph(Glyph glyph) const |
| { |
| if (!m_platformData.size()) |
| return 0; |
| |
| HWndDC dc(0); |
| HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont()); |
| |
| int width = 0; |
| if (!GetCharWidthI(dc, glyph, 1, 0, &width)) { |
| // Ask the browser to preload the font and retry. |
| if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) { |
| // FIXME: Handle gracefully the error if this call also fails. |
| // See http://crbug.com/6401. |
| if (!GetCharWidthI(dc, glyph, 1, 0, &width)) |
| LOG_ERROR("Unable to get the char width after second attempt"); |
| } |
| } |
| |
| SelectObject(dc, oldFont); |
| |
| return static_cast<float>(width); |
| } |
| |
| } // namespace WebCore |