Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/VDMXParser.cpp

Index: Source/core/platform/graphics/VDMXParser.cpp
diff --git a/Source/core/platform/graphics/VDMXParser.cpp b/Source/core/platform/graphics/VDMXParser.cpp
deleted file mode 100644
index 5966ca77764ef41a0a4bc44d68ca3ade77e85a5a..0000000000000000000000000000000000000000
--- a/Source/core/platform/graphics/VDMXParser.cpp
+++ /dev/null
@@ -1,203 +0,0 @@
-/*
- * Copyright (c) 2008, 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 "config.h"
-#include "VDMXParser.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-#include "wtf/ByteOrder.h"
-
-// Buffer helper class
-//
-// This class perform some trival buffer operations while checking for
-// out-of-bounds errors. As a family they return false if anything is amiss,
-// updating the current offset otherwise.
-class Buffer {
-public:
-    Buffer(const uint8_t* buffer, size_t length)
-        : m_buffer(buffer)
-        , m_length(length)
-        , m_offset(0) { }
-
-    bool skip(size_t numBytes)
-    {
-        if (m_offset + numBytes > m_length)
-            return false;
-        m_offset += numBytes;
-        return true;
-    }
-
-    bool readU8(uint8_t* value)
-    {
-        if (m_offset + sizeof(uint8_t) > m_length)
-            return false;
-        *value = m_buffer[m_offset];
-        m_offset += sizeof(uint8_t);
-        return true;
-    }
-
-    bool readU16(uint16_t* value)
-    {
-        if (m_offset + sizeof(uint16_t) > m_length)
-            return false;
-        memcpy(value, m_buffer + m_offset, sizeof(uint16_t));
-        *value = ntohs(*value);
-        m_offset += sizeof(uint16_t);
-        return true;
-    }
-
-    bool readS16(int16_t* value)
-    {
-        return readU16(reinterpret_cast<uint16_t*>(value));
-    }
-
-    size_t offset() const
-    {
-        return m_offset;
-    }
-
-    void setOffset(size_t newoffset)
-    {
-        m_offset = newoffset;
-    }
-
-private:
-    const uint8_t *const m_buffer;
-    const size_t m_length;
-    size_t m_offset;
-};
-
-// VDMX parsing code.
-//
-// VDMX tables are found in some TrueType/OpenType fonts and contain
-// ascender/descender overrides for certain (usually small) sizes. This is
-// needed in order to match font metrics on Windows.
-//
-// Freetype does not parse these tables so we do so here.
-
-namespace WebCore {
-
-// Parse a TrueType VDMX table.
-//   yMax: (output) the ascender value from the table
-//   yMin: (output) the descender value from the table (negative!)
-//   vdmx: the table bytes
-//   vdmxLength: length of @vdmx, in bytes
-//   targetPixelSize: the pixel size of the font (e.g. 16)
-//
-// Returns true iff a suitable match are found. Otherwise, *yMax and *yMin are
-// untouched. size_t must be 32-bits to avoid overflow.
-//
-// See http://www.microsoft.com/opentype/otspec/vdmx.htm
-bool parseVDMX(int* yMax, int* yMin,
-               const uint8_t* vdmx, size_t vdmxLength,
-               unsigned targetPixelSize)
-{
-    Buffer buf(vdmx, vdmxLength);
-
-    // We ignore the version. Future tables should be backwards compatible with
-    // this layout.
-    uint16_t numRatios;
-    if (!buf.skip(4) || !buf.readU16(&numRatios))
-        return false;
-
-    // Now we have two tables. Firstly we have @numRatios Ratio records, then a
-    // matching array of @numRatios offsets. We save the offset of the beginning
-    // of this second table.
-    //
-    // Range 6 <= x <= 262146
-    unsigned long offsetTableOffset =
-        buf.offset() + 4 /* sizeof struct ratio */ * numRatios;
-
-    unsigned desiredRatio = 0xffffffff;
-    // We read 4 bytes per record, so the offset range is
-    //   6 <= x <= 524286
-    for (unsigned i = 0; i < numRatios; ++i) {
-        uint8_t xRatio, yRatio1, yRatio2;
-
-        if (!buf.skip(1)
-            || !buf.readU8(&xRatio)
-            || !buf.readU8(&yRatio1)
-            || !buf.readU8(&yRatio2))
-            return false;
-
-        // This either covers 1:1, or this is the default entry (0, 0, 0)
-        if ((xRatio == 1 && yRatio1 <= 1 && yRatio2 >= 1)
-            || (xRatio == 0 && yRatio1 == 0 && yRatio2 == 0)) {
-            desiredRatio = i;
-            break;
-        }
-    }
-
-    if (desiredRatio == 0xffffffff) // no ratio found
-        return false;
-
-    // Range 10 <= x <= 393216
-    buf.setOffset(offsetTableOffset + sizeof(uint16_t) * desiredRatio);
-
-    // Now we read from the offset table to get the offset of another array
-    uint16_t groupOffset;
-    if (!buf.readU16(&groupOffset))
-        return false;
-    // Range 0 <= x <= 65535
-    buf.setOffset(groupOffset);
-
-    uint16_t numRecords;
-    if (!buf.readU16(&numRecords) || !buf.skip(sizeof(uint16_t)))
-        return false;
-
-    // We read 6 bytes per record, so the offset range is
-    //   4 <= x <= 458749
-    for (unsigned i = 0; i < numRecords; ++i) {
-        uint16_t pixelSize;
-        if (!buf.readU16(&pixelSize))
-            return false;
-        // the entries are sorted, so we can abort early if need be
-        if (pixelSize > targetPixelSize)
-            return false;
-
-        if (pixelSize == targetPixelSize) {
-            int16_t tempYMax, tempYMin;
-            if (!buf.readS16(&tempYMax)
-                || !buf.readS16(&tempYMin))
-                return false;
-            *yMin = tempYMin;
-            *yMax = tempYMax;
-            return true;
-        }
-        if (!buf.skip(2 * sizeof(int16_t)))
-            return false;
-    }
-
-    return false;
-}
-
-} // namespace WebCore