Avoid one temporary copy on web fonts decoding

third_party/WebKit/Source/platform/fonts/opentype/OpenTypeSanitizer.cpp

Index: third_party/WebKit/Source/platform/fonts/opentype/OpenTypeSanitizer.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/opentype/OpenTypeSanitizer.cpp b/third_party/WebKit/Source/platform/fonts/opentype/OpenTypeSanitizer.cpp
deleted file mode 100644
index f281fc1859d5afbc56d224387cfa1eddd4c02338..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/platform/fonts/opentype/OpenTypeSanitizer.cpp
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * Copyright (C) 2009 Google 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.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "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 "platform/fonts/opentype/OpenTypeSanitizer.h"
-
-#include "hb.h"
-#include "ots-memory-stream.h"
-#include "platform/Histogram.h"
-#include "platform/SharedBuffer.h"
-#include "platform/TraceEvent.h"
-#include "public/platform/Platform.h"
-#include "wtf/CurrentTime.h"
-
-#include <stdarg.h>
-
-namespace blink {
-
-static void recordDecodeSpeedHistogram(SharedBuffer* buffer, double decodeTime, size_t decodedSize)
-{
-    if (decodeTime <= 0)
-        return;
-
-    double kbPerSecond = decodedSize / (1000 * decodeTime);
-    if (buffer->size() >= 4) {
-        const char* data = buffer->data();
-        if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == 'F') {
-            DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, woffHistogram, new CustomCountHistogram("WebFont.DecodeSpeed.WOFF", 1000, 300000, 50));
-            woffHistogram.count(kbPerSecond);
-            return;
-        }
-
-        if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == '2') {
-            DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, woff2Histogram, new CustomCountHistogram("WebFont.DecodeSpeed.WOFF2", 1000, 300000, 50));
-            woff2Histogram.count(kbPerSecond);
-            return;
-        }
-    }
-
-    DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, sfntHistogram, new CustomCountHistogram("WebFont.DecodeSpeed.SFNT", 1000, 300000, 50));
-    sfntHistogram.count(kbPerSecond);
-}
-
-PassRefPtr<SharedBuffer> OpenTypeSanitizer::sanitize()
-{
-    if (!m_buffer) {
-        setErrorString("Empty Buffer");
-        return nullptr;
-    }
-
-    // This is the largest web font size which we'll try to transcode.
-    static const size_t maxWebFontSize = 30 * 1024 * 1024; // 30 MB
-    if (m_buffer->size() > maxWebFontSize) {
-        setErrorString("Web font size more than 30MB");
-        return nullptr;
-    }
-
-    // A transcoded font is usually smaller than an original font.
-    // However, it can be slightly bigger than the original one due to
-    // name table replacement and/or padding for glyf table.
-    //
-    // With WOFF fonts, however, we'll be decompressing, so the result can be
-    // much larger than the original.
-
-    ots::ExpandingMemoryStream output(m_buffer->size(), maxWebFontSize);
-    double start = currentTime();
-    BlinkOTSContext otsContext;
-
-    TRACE_EVENT_BEGIN0("blink", "DecodeFont");
-    bool ok = otsContext.Process(&output, reinterpret_cast<const uint8_t*>(m_buffer->data()), m_buffer->size());
-    TRACE_EVENT_END0("blink", "DecodeFont");
-
-    if (!ok) {
-        setErrorString(otsContext.getErrorString());
-        return nullptr;
-    }
-
-    const size_t transcodeLen = output.Tell();
-    recordDecodeSpeedHistogram(m_buffer, currentTime() - start, transcodeLen);
-    return SharedBuffer::create(static_cast<unsigned char*>(output.get()), transcodeLen);
-}
-
-bool OpenTypeSanitizer::supportsFormat(const String& format)
-{
-    return equalIgnoringCase(format, "woff") || equalIgnoringCase(format, "woff2");
-}
-
-void BlinkOTSContext::Message(int level, const char *format, ...)
-{
-    va_list args;
-    va_start(args, format);
-
-#if COMPILER(MSVC)
-    int result = _vscprintf(format, args);
-#else
-    char ch;
-    int result = vsnprintf(&ch, 1, format, args);
-#endif
-    va_end(args);
-
-    if (result <= 0) {
-        m_errorString = String("OTS Error");
-    } else {
-        Vector<char, 256> buffer;
-        unsigned len = result;
-        buffer.grow(len + 1);
-
-        va_start(args, format);
-        vsnprintf(buffer.data(), buffer.size(), format, args);
-        va_end(args);
-        m_errorString = StringImpl::create(reinterpret_cast<const LChar*>(buffer.data()), len);
-    }
-}
-
-#if !defined(HB_VERSION_ATLEAST)
-#define HB_VERSION_ATLEAST(major, minor, micro) 0
-#endif
-
-ots::TableAction BlinkOTSContext::GetTableAction(uint32_t tag)
-{
-    const uint32_t cbdtTag = OTS_TAG('C', 'B', 'D', 'T');
-    const uint32_t cblcTag = OTS_TAG('C', 'B', 'L', 'C');
-    const uint32_t colrTag = OTS_TAG('C', 'O', 'L', 'R');
-    const uint32_t cpalTag = OTS_TAG('C', 'P', 'A', 'L');
-#if HB_VERSION_ATLEAST(1, 0, 0)
-    const uint32_t gdefTag = OTS_TAG('G', 'D', 'E', 'F');
-    const uint32_t gposTag = OTS_TAG('G', 'P', 'O', 'S');
-    const uint32_t gsubTag = OTS_TAG('G', 'S', 'U', 'B');
-#endif
-
-    switch (tag) {
-    // Google Color Emoji Tables
-    case cbdtTag:
-    case cblcTag:
-    // Windows Color Emoji Tables
-    case colrTag:
-    case cpalTag:
-#if HB_VERSION_ATLEAST(1, 0, 0)
-    // Let HarfBuzz handle how to deal with broken tables.
-    case gdefTag:
-    case gposTag:
-    case gsubTag:
-#endif
-        return ots::TABLE_ACTION_PASSTHRU;
-    default:
-        return ots::TABLE_ACTION_DEFAULT;
-    }
-}
-
-} // namespace blink