1/* 2 * Copyright 2009, The Android Open Source Project 3 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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 copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include "config.h" 28 29#include "EmojiFont.h" 30#include "Font.h" 31#include "GlyphPageTreeNode.h" 32#include "HarfbuzzSkia.h" 33#include "SimpleFontData.h" 34#include "SkFontHost.h" 35#include "SkPaint.h" 36#include "SkTemplates.h" 37#include "SkUtils.h" 38#include "VerticalTextMap.h" 39 40 41using namespace android; 42 43namespace WebCore { 44 45#define NO_BREAK_SPACE_UNICHAR 0xA0 46 47static int substituteWithVerticalGlyphs(const FontPlatformData& platformData, uint16_t* glyphs, unsigned bufferLength) 48{ 49 HB_FaceRec_* hbFace = platformData.harfbuzzFace(); 50 if (!hbFace->gsub) { 51 // if there is no GSUB table, treat it as not covered 52 return 0Xffff; 53 } 54 55 HB_Buffer buffer; 56 hb_buffer_new(&buffer); 57 for (unsigned i = 0; i < bufferLength; ++i) 58 hb_buffer_add_glyph(buffer, glyphs[i], 0, i); 59 60 HB_UShort scriptIndex; 61 HB_UShort featureIndex; 62 63 HB_GSUB_Select_Script(hbFace->gsub, HB_MAKE_TAG('D', 'F', 'L', 'T'), &scriptIndex); 64 HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'e', 'r', 't'), scriptIndex, 0xffff, &featureIndex); 65 HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1); 66 HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'r', 't', '2'), scriptIndex, 0xffff, &featureIndex); 67 HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1); 68 69 int error = HB_GSUB_Apply_String(hbFace->gsub, buffer); 70 if (!error) { 71 for (unsigned i = 0; i < bufferLength; ++i) 72 glyphs[i] = static_cast<Glyph>(buffer->out_string[i].gindex); 73 } 74 return error; 75} 76 77bool GlyphPage::fill(unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData) 78{ 79 if (SkUTF16_IsHighSurrogate(buffer[bufferLength-1])) { 80 SkDebugf("%s last char is high-surrogate", __FUNCTION__); 81 return false; 82 } 83 84 SkPaint paint; 85 fontData->platformData().setupPaint(&paint); 86 paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); 87 88 SkAutoSTMalloc <GlyphPage::size, uint16_t> glyphStorage(length); 89 uint16_t* glyphs = glyphStorage.get(); 90 UChar *textBuffer = buffer; 91 UChar vTextBuffer[bufferLength]; 92 93 if (fontData->platformData().orientation() == Vertical && !fontData->hasVerticalGlyphs()) { 94 // Convert to vertical form if there is no vertical glyphs. 95 for (unsigned i = 0; i < bufferLength; ++i) { 96 vTextBuffer[i] = VerticalTextMap::getVerticalForm(buffer[i]); 97 if (!vTextBuffer[i]) 98 vTextBuffer[i] = buffer[i]; 99 } 100 textBuffer = vTextBuffer; 101 } 102 103 unsigned count = paint.textToGlyphs(textBuffer, bufferLength << 1, glyphs); 104 if (count != length) { 105 SkDebugf("%s count != length\n", __FUNCTION__); 106 return false; 107 } 108 109 if (fontData->hasVerticalGlyphs()) { 110 bool lookVariants = false; 111 for (unsigned i = 0; i < bufferLength; ++i) { 112 if (!Font::isCJKIdeograph(textBuffer[i])) { 113 lookVariants = true; 114 continue; 115 } 116 } 117 if (lookVariants) 118 substituteWithVerticalGlyphs(fontData->platformData(), glyphs, bufferLength); 119 } 120 121 unsigned allGlyphs = 0; // track if any of the glyphIDs are non-zero 122 123 // search for emoji. If we knew for sure that buffer was a contiguous range 124 // of chars, we could quick-reject the range to avoid this loop (usually) 125 if (EmojiFont::IsAvailable()) { 126 const UChar* curr = textBuffer; 127 for (unsigned i = 0; i < length; i++) { 128 SkUnichar uni = SkUTF16_NextUnichar(&curr); 129 uint16_t glyphID = glyphs[i]; 130 // only sniff if the normal font failed to recognize it 131 if (!glyphID) 132 glyphID = EmojiFont::UnicharToGlyph(uni); 133 setGlyphDataForIndex(offset + i, glyphID, fontData); 134 allGlyphs |= glyphID; 135 } 136 } else { 137 for (unsigned i = 0; i < length; i++) { 138 uint16_t glyphID = glyphs[i]; 139 setGlyphDataForIndex(offset + i, glyphID, fontData); 140 allGlyphs |= glyphID; 141 } 142 } 143 return allGlyphs != 0; 144} 145 146} 147