| /* |
| * Copyright (C) 2006 Apple Inc. |
| * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com |
| * Copyright (C) 2007, 2008 Alp Toker <alp@atoker.com> |
| * Copyright (C) 2007 Holger Hans Peter Freyther |
| * Copyright (C) 2009, 2010 Igalia S.L. |
| * 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 "FontPlatformData.h" |
| |
| #include "CairoUniquePtr.h" |
| #include "CairoUtilities.h" |
| #include "FontCache.h" |
| #include "SharedBuffer.h" |
| #include <cairo-ft.h> |
| #include <fontconfig/fcfreetype.h> |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| #include FT_TRUETYPE_TABLES_H |
| #include <hb-ft.h> |
| #include <hb-ot.h> |
| #include <wtf/MathExtras.h> |
| #include <wtf/text/WTFString.h> |
| |
| namespace WebCore { |
| |
| static cairo_subpixel_order_t convertFontConfigSubpixelOrder(int fontConfigOrder) |
| { |
| switch (fontConfigOrder) { |
| case FC_RGBA_RGB: |
| return CAIRO_SUBPIXEL_ORDER_RGB; |
| case FC_RGBA_BGR: |
| return CAIRO_SUBPIXEL_ORDER_BGR; |
| case FC_RGBA_VRGB: |
| return CAIRO_SUBPIXEL_ORDER_VRGB; |
| case FC_RGBA_VBGR: |
| return CAIRO_SUBPIXEL_ORDER_VBGR; |
| case FC_RGBA_NONE: |
| case FC_RGBA_UNKNOWN: |
| return CAIRO_SUBPIXEL_ORDER_DEFAULT; |
| } |
| return CAIRO_SUBPIXEL_ORDER_DEFAULT; |
| } |
| |
| static cairo_hint_style_t convertFontConfigHintStyle(int fontConfigStyle) |
| { |
| switch (fontConfigStyle) { |
| case FC_HINT_NONE: |
| return CAIRO_HINT_STYLE_NONE; |
| case FC_HINT_SLIGHT: |
| return CAIRO_HINT_STYLE_SLIGHT; |
| case FC_HINT_MEDIUM: |
| return CAIRO_HINT_STYLE_MEDIUM; |
| case FC_HINT_FULL: |
| return CAIRO_HINT_STYLE_FULL; |
| } |
| return CAIRO_HINT_STYLE_NONE; |
| } |
| |
| static void setCairoFontOptionsFromFontConfigPattern(cairo_font_options_t* options, FcPattern* pattern) |
| { |
| FcBool booleanResult; |
| int integerResult; |
| |
| if (FcPatternGetInteger(pattern, FC_RGBA, 0, &integerResult) == FcResultMatch) { |
| cairo_font_options_set_subpixel_order(options, convertFontConfigSubpixelOrder(integerResult)); |
| |
| // Based on the logic in cairo-ft-font.c in the cairo source, a font with |
| // a subpixel order implies that is uses subpixel antialiasing. |
| if (integerResult != FC_RGBA_NONE) |
| cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_SUBPIXEL); |
| } |
| |
| if (FcPatternGetBool(pattern, FC_ANTIALIAS, 0, &booleanResult) == FcResultMatch) { |
| // Only override the anti-aliasing setting if was previously turned off. Otherwise |
| // we'll override the preference which decides between gray anti-aliasing and |
| // subpixel anti-aliasing. |
| if (!booleanResult) |
| cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_NONE); |
| else if (cairo_font_options_get_antialias(options) == CAIRO_ANTIALIAS_NONE) |
| cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_GRAY); |
| } |
| |
| if (FcPatternGetInteger(pattern, FC_HINT_STYLE, 0, &integerResult) == FcResultMatch) |
| cairo_font_options_set_hint_style(options, convertFontConfigHintStyle(integerResult)); |
| if (FcPatternGetBool(pattern, FC_HINTING, 0, &booleanResult) == FcResultMatch && !booleanResult) |
| cairo_font_options_set_hint_style(options, CAIRO_HINT_STYLE_NONE); |
| |
| #if ENABLE(VARIATION_FONTS) |
| FcChar8* variations; |
| if (FcPatternGetString(pattern, FC_FONT_VARIATIONS, 0, &variations) == FcResultMatch) { |
| cairo_font_options_set_variations(options, reinterpret_cast<char*>(variations)); |
| } |
| #endif |
| } |
| |
| FontPlatformData::FontPlatformData(cairo_font_face_t* fontFace, FcPattern* pattern, float size, bool fixedWidth, bool syntheticBold, bool syntheticOblique, FontOrientation orientation) |
| : FontPlatformData(size, syntheticBold, syntheticOblique, orientation) |
| { |
| m_pattern = pattern; |
| m_fixedWidth = fixedWidth; |
| |
| buildScaledFont(fontFace); |
| |
| #ifdef FT_HAS_COLOR |
| CairoFtFaceLocker cairoFtFaceLocker(m_scaledFont.get()); |
| if (FT_Face ftFace = cairoFtFaceLocker.ftFace()) |
| m_isColorBitmapFont = FT_HAS_COLOR(ftFace); |
| #endif |
| } |
| |
| FontPlatformData FontPlatformData::cloneWithOrientation(const FontPlatformData& source, FontOrientation orientation) |
| { |
| FontPlatformData copy(source); |
| if (copy.m_scaledFont && copy.m_orientation != orientation) { |
| copy.m_orientation = orientation; |
| copy.buildScaledFont(cairo_scaled_font_get_font_face(copy.m_scaledFont.get())); |
| } |
| return copy; |
| } |
| |
| FontPlatformData FontPlatformData::cloneWithSyntheticOblique(const FontPlatformData& source, bool syntheticOblique) |
| { |
| FontPlatformData copy(source); |
| if (copy.m_syntheticOblique != syntheticOblique) { |
| copy.m_syntheticOblique = syntheticOblique; |
| ASSERT(copy.m_scaledFont.get()); |
| copy.buildScaledFont(cairo_scaled_font_get_font_face(copy.m_scaledFont.get())); |
| } |
| return copy; |
| } |
| |
| FontPlatformData FontPlatformData::cloneWithSize(const FontPlatformData& source, float size) |
| { |
| FontPlatformData copy(source); |
| copy.m_size = size; |
| // We need to reinitialize the instance, because the difference in size |
| // necessitates a new scaled font instance. |
| ASSERT(copy.m_scaledFont.get()); |
| copy.buildScaledFont(cairo_scaled_font_get_font_face(copy.m_scaledFont.get())); |
| return copy; |
| } |
| |
| FcPattern* FontPlatformData::fcPattern() const |
| { |
| return m_pattern.get(); |
| } |
| |
| bool FontPlatformData::isFixedPitch() const |
| { |
| return m_fixedWidth; |
| } |
| |
| unsigned FontPlatformData::hash() const |
| { |
| return PtrHash<cairo_scaled_font_t*>::hash(m_scaledFont.get()); |
| } |
| |
| bool FontPlatformData::platformIsEqual(const FontPlatformData& other) const |
| { |
| // FcPatternEqual does not support null pointers as arguments. |
| if ((m_pattern && !other.m_pattern) |
| || (!m_pattern && other.m_pattern) |
| || (m_pattern != other.m_pattern && !FcPatternEqual(m_pattern.get(), other.m_pattern.get()))) |
| return false; |
| |
| return m_scaledFont == other.m_scaledFont; |
| } |
| |
| #if !LOG_DISABLED |
| String FontPlatformData::description() const |
| { |
| return String(); |
| } |
| #endif |
| |
| void FontPlatformData::buildScaledFont(cairo_font_face_t* fontFace) |
| { |
| ASSERT(m_pattern); |
| CairoUniquePtr<cairo_font_options_t> options(cairo_font_options_copy(getDefaultCairoFontOptions())); |
| setCairoFontOptionsFromFontConfigPattern(options.get(), m_pattern.get()); |
| |
| cairo_matrix_t ctm; |
| cairo_matrix_init_identity(&ctm); |
| |
| // FontConfig may return a list of transformation matrices with the pattern, for instance, |
| // for fonts that are oblique. We use that to initialize the cairo font matrix. |
| cairo_matrix_t fontMatrix; |
| FcMatrix fontConfigMatrix, *tempFontConfigMatrix; |
| FcMatrixInit(&fontConfigMatrix); |
| |
| // These matrices may be stacked in the pattern, so it's our job to get them all and multiply them. |
| for (int i = 0; FcPatternGetMatrix(m_pattern.get(), FC_MATRIX, i, &tempFontConfigMatrix) == FcResultMatch; i++) |
| FcMatrixMultiply(&fontConfigMatrix, &fontConfigMatrix, tempFontConfigMatrix); |
| |
| cairo_matrix_init(&fontMatrix, 1, -fontConfigMatrix.yx, -fontConfigMatrix.xy, 1, 0, 0); |
| |
| // The matrix from FontConfig does not include the scale. Scaling a font with width zero size leads |
| // to a failed cairo_scaled_font_t instantiations. Instead we scale the font to a very tiny |
| // size and just abort rendering later on. |
| float realSize = m_size ? m_size : 1; |
| cairo_matrix_scale(&fontMatrix, realSize, realSize); |
| |
| if (syntheticOblique()) { |
| static const float syntheticObliqueSkew = -tanf(14 * acosf(0) / 90); |
| static const cairo_matrix_t skew = {1, 0, syntheticObliqueSkew, 1, 0, 0}; |
| static const cairo_matrix_t verticalSkew = {1, -syntheticObliqueSkew, 0, 1, 0, 0}; |
| cairo_matrix_multiply(&fontMatrix, m_orientation == FontOrientation::Vertical ? &verticalSkew : &skew, &fontMatrix); |
| } |
| |
| if (m_orientation == FontOrientation::Vertical) { |
| // The resulting transformation matrix for vertical glyphs (V) is a |
| // combination of rotation (R) and translation (T) applied on the |
| // horizontal matrix (H). V = H . R . T, where R rotates by -90 degrees |
| // and T translates by font size towards y axis. |
| cairo_matrix_rotate(&fontMatrix, -piOverTwoDouble); |
| cairo_matrix_translate(&fontMatrix, 0.0, 1.0); |
| } |
| |
| m_scaledFont = adoptRef(cairo_scaled_font_create(fontFace, &fontMatrix, &ctm, options.get())); |
| } |
| |
| bool FontPlatformData::hasCompatibleCharmap() const |
| { |
| ASSERT(m_scaledFont.get()); |
| CairoFtFaceLocker cairoFtFaceLocker(m_scaledFont.get()); |
| FT_Face freeTypeFace = cairoFtFaceLocker.ftFace(); |
| if (!freeTypeFace) |
| return false; |
| return !(FT_Select_Charmap(freeTypeFace, ft_encoding_unicode) |
| && FT_Select_Charmap(freeTypeFace, ft_encoding_symbol) |
| && FT_Select_Charmap(freeTypeFace, ft_encoding_apple_roman)); |
| } |
| |
| RefPtr<SharedBuffer> FontPlatformData::openTypeTable(uint32_t table) const |
| { |
| CairoFtFaceLocker cairoFtFaceLocker(m_scaledFont.get()); |
| FT_Face freeTypeFace = cairoFtFaceLocker.ftFace(); |
| if (!freeTypeFace) |
| return nullptr; |
| |
| FT_ULong tableSize = 0; |
| // Tag bytes need to be reversed because OT_MAKE_TAG uses big-endian order. |
| uint32_t tag = FT_MAKE_TAG((table & 0xff), (table & 0xff00) >> 8, (table & 0xff0000) >> 16, table >> 24); |
| if (FT_Load_Sfnt_Table(freeTypeFace, tag, 0, 0, &tableSize)) |
| return nullptr; |
| |
| Vector<char> data(tableSize); |
| FT_ULong expectedTableSize = tableSize; |
| FT_Error error = FT_Load_Sfnt_Table(freeTypeFace, tag, 0, reinterpret_cast<FT_Byte*>(data.data()), &tableSize); |
| if (error || tableSize != expectedTableSize) |
| return nullptr; |
| |
| return SharedBuffer::create(WTFMove(data)); |
| } |
| |
| #if USE(HARFBUZZ) && !ENABLE(OPENTYPE_MATH) |
| HbUniquePtr<hb_font_t> FontPlatformData::createOpenTypeMathHarfBuzzFont() const |
| { |
| CairoFtFaceLocker cairoFtFaceLocker(m_scaledFont.get()); |
| FT_Face ftFace = cairoFtFaceLocker.ftFace(); |
| if (!ftFace) |
| return nullptr; |
| |
| HbUniquePtr<hb_face_t> face(hb_ft_face_create_cached(ftFace)); |
| if (!hb_ot_math_has_data(face.get())) |
| return nullptr; |
| |
| return HbUniquePtr<hb_font_t>(hb_font_create(face.get())); |
| } |
| #endif |
| |
| } // namespace WebCore |