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0df89c14c4
We create and destroy ScaledFonts for every piece of text we write. That causes a huge amount of duplicated data within the recording. This splits out the recording of the font data itself from the ScaledFont. The key generated to determine uniqueness could probably be fairly easily faked, but for our purposes that doesn't matter.
94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_gfx_SFNTData_h
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#define mozilla_gfx_SFNTData_h
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#include "mozilla/UniquePtr.h"
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#include "mozilla/Vector.h"
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#include "u16string.h"
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namespace mozilla {
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namespace gfx {
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class SFNTData final
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{
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public:
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/**
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* Creates an SFNTData if the header is a format that we understand and
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* aDataLength is sufficient for the length information in the header data.
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* Note that the data is NOT copied, so must exist the SFNTData's lifetime.
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*
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* @param aFontData the SFNT data.
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* @param aDataLength length
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* @return UniquePtr to a SFNTData or nullptr if the header is invalid.
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*/
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static UniquePtr<SFNTData> Create(const uint8_t *aFontData,
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uint32_t aDataLength);
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/**
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* Creates a unique key for the given font data.
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*
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* @param aFontData the SFNT data
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* @param aDataLength length
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* @return unique key to be used for caching
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*/
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static uint64_t GetUniqueKey(const uint8_t *aFontData, uint32_t aDataLength);
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~SFNTData();
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/**
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* Gets the full name from the name table of the font corresponding to the
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* index. If the full name string is not present it will use the family space
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* concatenated with the style.
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* This will only read names that are already UTF16.
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*
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* @param aFontData SFNT data.
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* @param aDataLength length of aFontData.
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* @param aU16FullName string to be populated with the full name.
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* @return true if the full name is successfully read.
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*/
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bool GetU16FullName(uint32_t aIndex, mozilla::u16string& aU16FullName);
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/**
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* Populate a Vector with the first UTF16 full name from each name table of
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* the fonts. If the full name string is not present it will use the family
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* space concatenated with the style.
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* This will only read names that are already UTF16.
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*
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* @param aU16FullNames the Vector to be populated.
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* @return true if at least one name found otherwise false.
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*/
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bool GetU16FullNames(Vector<mozilla::u16string>& aU16FullNames);
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/**
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* Returns the index for the first UTF16 name matching aU16FullName.
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*
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* @param aU16FullName full name to find.
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* @param aIndex out param for the index if found.
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* @return true if the full name is successfully read.
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*/
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bool GetIndexForU16Name(const mozilla::u16string& aU16FullName, uint32_t* aIndex);
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private:
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SFNTData() {}
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bool AddFont(const uint8_t *aFontData, uint32_t aDataLength,
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uint32_t aOffset);
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// Internal representation of single font in font file.
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class Font;
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Vector<Font*> mFonts;
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};
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} // gfx
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} // mozilla
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#endif // mozilla_gfx_SFNTData_h
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