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
substituteWithVerticalGlyphs(const SimpleFontData * fontData,uint16_t * glyphs,unsigned bufferLength)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
fill(unsigned offset,unsigned length,UChar * buffer,unsigned bufferLength,const SimpleFontData * fontData)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