1 /* 2 * Copyright (c) 2008, 2009 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 "GlyphPageTreeNode.h" 33 34 #include "Font.h" 35 #include "HarfbuzzSkia.h" 36 #include "SimpleFontData.h" 37 38 #include "SkTemplates.h" 39 #include "SkPaint.h" 40 #include "SkUtils.h" 41 42 namespace WebCore { 43 44 static int substituteWithVerticalGlyphs(const SimpleFontData* fontData, uint16_t* glyphs, unsigned bufferLength) 45 { 46 HB_FaceRec_* hbFace = fontData->platformData().harfbuzzFace(); 47 if (!hbFace->gsub) { 48 // if there is no GSUB table, treat it as not covered 49 return 0Xffff; 50 } 51 52 HB_Buffer buffer; 53 hb_buffer_new(&buffer); 54 for (unsigned i = 0; i < bufferLength; ++i) 55 hb_buffer_add_glyph(buffer, glyphs[i], 0, i); 56 57 HB_UShort scriptIndex; 58 HB_UShort featureIndex; 59 60 HB_GSUB_Select_Script(hbFace->gsub, HB_MAKE_TAG('D', 'F', 'L', 'T'), &scriptIndex); 61 HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'e', 'r', 't'), scriptIndex, 0xffff, &featureIndex); 62 HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1); 63 HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'r', 't', '2'), scriptIndex, 0xffff, &featureIndex); 64 HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1); 65 66 int error = HB_GSUB_Apply_String(hbFace->gsub, buffer); 67 if (!error) { 68 for (unsigned i = 0; i < bufferLength; ++i) 69 glyphs[i] = static_cast<Glyph>(buffer->out_string[i].gindex); 70 } 71 return error; 72 } 73 74 bool GlyphPage::fill(unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData) 75 { 76 if (SkUTF16_IsHighSurrogate(buffer[bufferLength-1])) { 77 SkDebugf("%s last char is high-surrogate", __FUNCTION__); 78 return false; 79 } 80 81 SkPaint paint; 82 fontData->platformData().setupPaint(&paint); 83 paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); 84 85 SkAutoSTMalloc <GlyphPage::size, uint16_t> glyphStorage(length); 86 uint16_t* glyphs = glyphStorage.get(); 87 // textToGlyphs takes a byte count, not a glyph count so we multiply by two. 88 unsigned count = paint.textToGlyphs(buffer, bufferLength * 2, glyphs); 89 if (count != length) { 90 SkDebugf("%s count != length\n", __FUNCTION__); 91 return false; 92 } 93 94 if (fontData->hasVerticalGlyphs()) { 95 bool lookVariants = false; 96 for (unsigned i = 0; i < bufferLength; ++i) { 97 if (!Font::isCJKIdeograph(buffer[i])) { 98 lookVariants = true; 99 continue; 100 } 101 } 102 if (lookVariants) 103 substituteWithVerticalGlyphs(fontData, glyphs, bufferLength); 104 } 105 106 unsigned allGlyphs = 0; // track if any of the glyphIDs are non-zero 107 for (unsigned i = 0; i < length; i++) { 108 setGlyphDataForIndex(offset + i, glyphs[i], glyphs[i] ? fontData : NULL); 109 allGlyphs |= glyphs[i]; 110 } 111 112 return allGlyphs != 0; 113 } 114 115 } // namespace WebCore 116