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      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 "GlyphPageTreeNode.h"
     31 #include "SkTemplates.h"
     32 #include "SkPaint.h"
     33 #include "SkUtils.h"
     34 #include "SimpleFontData.h"
     35 
     36 using namespace android;
     37 
     38 namespace WebCore {
     39 
     40 #define NO_BREAK_SPACE_UNICHAR  0xA0
     41 
     42 bool GlyphPage::fill(unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData)
     43 {
     44     if (SkUTF16_IsHighSurrogate(buffer[bufferLength-1])) {
     45         SkDebugf("%s last char is high-surrogate", __FUNCTION__);
     46         return false;
     47     }
     48 
     49     SkPaint paint;
     50     fontData->platformData().setupPaint(&paint);
     51     paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
     52 
     53     SkAutoSTMalloc <GlyphPage::size, uint16_t> glyphStorage(length);
     54     uint16_t* glyphs = glyphStorage.get();
     55     unsigned count = paint.textToGlyphs(buffer, bufferLength << 1, glyphs);
     56     if (count != length) {
     57         SkDebugf("%s count != length\n", __FUNCTION__);
     58         return false;
     59     }
     60 
     61     unsigned allGlyphs = 0; // track if any of the glyphIDs are non-zero
     62 
     63     // search for emoji. If we knew for sure that buffer was a contiguous range
     64     // of chars, we could quick-reject the range to avoid this loop (usually)
     65     if (EmojiFont::IsAvailable()) {
     66         const UChar* curr = buffer;
     67         for (unsigned i = 0; i < length; i++) {
     68             SkUnichar uni = SkUTF16_NextUnichar(&curr);
     69             uint16_t glyphID = glyphs[i];
     70             // only sniff if the normal font failed to recognize it
     71             if (!glyphID)
     72                 glyphID = EmojiFont::UnicharToGlyph(uni);
     73             setGlyphDataForIndex(offset + i, glyphID, fontData);
     74             allGlyphs |= glyphID;
     75         }
     76     } else {
     77         for (unsigned i = 0; i < length; i++) {
     78             uint16_t glyphID = glyphs[i];
     79             setGlyphDataForIndex(offset + i, glyphID, fontData);
     80             allGlyphs |= glyphID;
     81         }
     82     }
     83     return allGlyphs != 0;
     84 }
     85 
     86 }
     87