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/*
* Copyright 2009, The Android Open Source Project
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "EmojiFont.h"
#include "Font.h"
#include "GlyphPageTreeNode.h"
#include "HarfbuzzSkia.h"
#include "SimpleFontData.h"
#include "SkFontHost.h"
#include "SkPaint.h"
#include "SkTemplates.h"
#include "SkUtils.h"
#include "VerticalTextMap.h"
using namespace android;
namespace WebCore {
#define NO_BREAK_SPACE_UNICHAR 0xA0
static HB_Error substituteWithVerticalGlyphs(const FontPlatformData& platformData, uint16_t* glyphs, unsigned bufferLength)
{
HB_FaceRec_* hbFace = platformData.harfbuzzFace();
if (!hbFace->gsub) {
// if there is no GSUB table, treat it as not covered
return static_cast<HB_Error>(0Xffff);
}
HB_Buffer buffer;
hb_buffer_new(&buffer);
for (unsigned i = 0; i < bufferLength; ++i)
hb_buffer_add_glyph(buffer, glyphs[i], 0, i);
HB_UShort scriptIndex;
HB_UShort featureIndex;
HB_Error error = HB_GSUB_Select_Script(hbFace->gsub, HB_MAKE_TAG('D', 'F', 'L', 'T'), &scriptIndex);
if (error) {
if (error != HB_Err_Not_Covered)
return error;
scriptIndex = HB_Script_Common; // Set script to common script.
}
HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'e', 'r', 't'), scriptIndex, 0xffff, &featureIndex);
HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1);
HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'r', 't', '2'), scriptIndex, 0xffff, &featureIndex);
HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1);
error = HB_GSUB_Apply_String(hbFace->gsub, buffer);
if (!error) {
for (unsigned i = 0; i < bufferLength; ++i)
glyphs[i] = static_cast<Glyph>(buffer->out_string[i].gindex);
}
return error;
}
static void convertToVerticalForms(UChar* src, UChar* dest, unsigned bufferLength) {
for (unsigned i = 0; i < bufferLength; ++i) {
dest[i] = VerticalTextMap::getVerticalForm(src[i]);
if (!dest[i])
dest[i] = src[i];
}
}
bool GlyphPage::fill(unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData)
{
if (SkUTF16_IsHighSurrogate(buffer[bufferLength-1])) {
SkDebugf("%s last char is high-surrogate", __FUNCTION__);
return false;
}
SkPaint paint;
fontData->platformData().setupPaint(&paint);
paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
SkAutoSTMalloc <GlyphPage::size, uint16_t> glyphStorage(length);
uint16_t* glyphs = glyphStorage.get();
UChar *textBuffer = buffer;
UChar vTextBuffer[bufferLength];
if (fontData->platformData().orientation() == Vertical && !fontData->hasVerticalGlyphs()) {
// Convert to vertical form if there is no vertical glyphs.
convertToVerticalForms(buffer, vTextBuffer, bufferLength);
textBuffer = vTextBuffer;
}
unsigned count = paint.textToGlyphs(textBuffer, bufferLength << 1, glyphs);
if (count != length) {
SkDebugf("%s count != length\n", __FUNCTION__);
return false;
}
if (fontData->hasVerticalGlyphs()) {
bool lookVariants = false;
for (unsigned i = 0; i < bufferLength; ++i) {
if (!Font::isCJKIdeograph(textBuffer[i])) {
lookVariants = true;
break;
}
}
if (lookVariants) {
if (substituteWithVerticalGlyphs(fontData->platformData(), glyphs, bufferLength)) {
// Convert text to vertical forms if substituteWithVerticalGlyphs() fails to access vert tables.
convertToVerticalForms(buffer, vTextBuffer, bufferLength);
textBuffer = vTextBuffer;
unsigned count = paint.textToGlyphs(textBuffer, bufferLength << 1, glyphs);
if (count != length) {
SkDebugf("%s count != length\n", __FUNCTION__);
return false;
}
}
}
}
unsigned allGlyphs = 0; // track if any of the glyphIDs are non-zero
// search for emoji. If we knew for sure that buffer was a contiguous range
// of chars, we could quick-reject the range to avoid this loop (usually)
if (EmojiFont::IsAvailable()) {
const UChar* curr = textBuffer;
for (unsigned i = 0; i < length; i++) {
SkUnichar uni = SkUTF16_NextUnichar(&curr);
uint16_t glyphID = glyphs[i];
// only sniff if the normal font failed to recognize it
if (!glyphID)
glyphID = EmojiFont::UnicharToGlyph(uni);
setGlyphDataForIndex(offset + i, glyphID, fontData);
allGlyphs |= glyphID;
}
} else {
for (unsigned i = 0; i < length; i++) {
uint16_t glyphID = glyphs[i];
setGlyphDataForIndex(offset + i, glyphID, fontData);
allGlyphs |= glyphID;
}
}
return allGlyphs != 0;
}
}
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