зеркало из https://github.com/mozilla/gecko-dev.git
436 строки
11 KiB
C++
436 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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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#include "ScaledFontDWrite.h"
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#include "PathD2D.h"
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#include "DrawTargetD2D.h"
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#include "Logging.h"
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#include <vector>
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namespace mozilla {
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namespace gfx {
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struct ffReferenceKey
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{
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uint8_t *mData;
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uint32_t mSize;
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};
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class DWriteFontFileLoader : public IDWriteFontFileLoader
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{
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public:
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DWriteFontFileLoader()
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{
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}
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// IUnknown interface
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IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject)
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{
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if (iid == __uuidof(IDWriteFontFileLoader)) {
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*ppObject = static_cast<IDWriteFontFileLoader*>(this);
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return S_OK;
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} else if (iid == __uuidof(IUnknown)) {
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*ppObject = static_cast<IUnknown*>(this);
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return S_OK;
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} else {
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return E_NOINTERFACE;
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}
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}
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IFACEMETHOD_(ULONG, AddRef)()
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{
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return 1;
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}
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IFACEMETHOD_(ULONG, Release)()
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{
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return 1;
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}
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// IDWriteFontFileLoader methods
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/**
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* Important! Note the key here -has- to be a pointer to an
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* ffReferenceKey object.
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*/
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virtual HRESULT STDMETHODCALLTYPE
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CreateStreamFromKey(void const* fontFileReferenceKey,
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UINT32 fontFileReferenceKeySize,
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OUT IDWriteFontFileStream** fontFileStream);
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/**
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* Gets the singleton loader instance. Note that when using this font
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* loader, the key must be a pointer to an FallibleTArray<uint8_t>. This
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* array will be empty when the function returns.
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*/
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static IDWriteFontFileLoader* Instance()
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{
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if (!mInstance) {
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mInstance = new DWriteFontFileLoader();
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DrawTargetD2D::GetDWriteFactory()->
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RegisterFontFileLoader(mInstance);
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}
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return mInstance;
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}
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private:
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static IDWriteFontFileLoader* mInstance;
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};
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class DWriteFontFileStream : public IDWriteFontFileStream
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{
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public:
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/**
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* Used by the FontFileLoader to create a new font stream,
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* this font stream is created from data in memory. The memory
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* passed may be released after object creation, it will be
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* copied internally.
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*
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* @param aData Font data
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*/
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DWriteFontFileStream(uint8_t *aData, uint32_t aSize);
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~DWriteFontFileStream();
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// IUnknown interface
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IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject)
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{
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if (iid == __uuidof(IDWriteFontFileStream)) {
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*ppObject = static_cast<IDWriteFontFileStream*>(this);
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return S_OK;
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} else if (iid == __uuidof(IUnknown)) {
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*ppObject = static_cast<IUnknown*>(this);
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return S_OK;
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} else {
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return E_NOINTERFACE;
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}
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}
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IFACEMETHOD_(ULONG, AddRef)()
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{
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++mRefCnt;
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return mRefCnt;
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}
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IFACEMETHOD_(ULONG, Release)()
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{
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--mRefCnt;
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if (mRefCnt == 0) {
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delete this;
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return 0;
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}
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return mRefCnt;
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}
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// IDWriteFontFileStream methods
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virtual HRESULT STDMETHODCALLTYPE ReadFileFragment(void const** fragmentStart,
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UINT64 fileOffset,
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UINT64 fragmentSize,
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OUT void** fragmentContext);
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virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext);
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virtual HRESULT STDMETHODCALLTYPE GetFileSize(OUT UINT64* fileSize);
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virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(OUT UINT64* lastWriteTime);
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private:
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std::vector<uint8_t> mData;
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uint32_t mRefCnt;
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};
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static BYTE
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GetSystemTextQuality()
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{
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BOOL font_smoothing;
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UINT smoothing_type;
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if (!SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &font_smoothing, 0)) {
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return DEFAULT_QUALITY;
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}
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if (font_smoothing) {
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if (!SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE,
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0, &smoothing_type, 0)) {
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return DEFAULT_QUALITY;
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}
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if (smoothing_type == FE_FONTSMOOTHINGCLEARTYPE) {
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return CLEARTYPE_QUALITY;
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}
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return ANTIALIASED_QUALITY;
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}
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return DEFAULT_QUALITY;
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}
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#define GASP_TAG 0x70736167
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#define GASP_DOGRAY 0x2
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static inline unsigned short
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readShort(const char *aBuf)
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{
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return (*aBuf << 8) | *(aBuf + 1);
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}
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static bool
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DoGrayscale(IDWriteFontFace *aDWFace, Float ppem)
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{
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void *tableContext;
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char *tableData;
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UINT32 tableSize;
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BOOL exists;
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aDWFace->TryGetFontTable(GASP_TAG, (const void**)&tableData, &tableSize, &tableContext, &exists);
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if (exists) {
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if (tableSize < 4) {
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aDWFace->ReleaseFontTable(tableContext);
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return true;
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}
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struct gaspRange {
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unsigned short maxPPEM; // Stored big-endian
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unsigned short behavior; // Stored big-endian
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};
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unsigned short numRanges = readShort(tableData + 2);
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if (tableSize < (UINT)4 + numRanges * 4) {
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aDWFace->ReleaseFontTable(tableContext);
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return true;
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}
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gaspRange *ranges = (gaspRange *)(tableData + 4);
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for (int i = 0; i < numRanges; i++) {
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if (readShort((char*)&ranges[i].maxPPEM) > ppem) {
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if (!(readShort((char*)&ranges[i].behavior) & GASP_DOGRAY)) {
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aDWFace->ReleaseFontTable(tableContext);
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return false;
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}
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break;
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}
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}
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aDWFace->ReleaseFontTable(tableContext);
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}
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return true;
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}
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IDWriteFontFileLoader* DWriteFontFileLoader::mInstance = nullptr;
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HRESULT STDMETHODCALLTYPE
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DWriteFontFileLoader::CreateStreamFromKey(const void *fontFileReferenceKey,
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UINT32 fontFileReferenceKeySize,
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IDWriteFontFileStream **fontFileStream)
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{
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if (!fontFileReferenceKey || !fontFileStream) {
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return E_POINTER;
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}
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const ffReferenceKey *key = static_cast<const ffReferenceKey*>(fontFileReferenceKey);
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*fontFileStream =
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new DWriteFontFileStream(key->mData, key->mSize);
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if (!*fontFileStream) {
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return E_OUTOFMEMORY;
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}
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(*fontFileStream)->AddRef();
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return S_OK;
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}
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DWriteFontFileStream::DWriteFontFileStream(uint8_t *aData, uint32_t aSize)
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: mRefCnt(0)
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{
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mData.resize(aSize);
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memcpy(&mData.front(), aData, aSize);
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}
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DWriteFontFileStream::~DWriteFontFileStream()
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{
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}
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HRESULT STDMETHODCALLTYPE
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DWriteFontFileStream::GetFileSize(UINT64 *fileSize)
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{
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*fileSize = mData.size();
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return S_OK;
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}
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HRESULT STDMETHODCALLTYPE
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DWriteFontFileStream::GetLastWriteTime(UINT64 *lastWriteTime)
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{
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return E_NOTIMPL;
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}
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HRESULT STDMETHODCALLTYPE
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DWriteFontFileStream::ReadFileFragment(const void **fragmentStart,
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UINT64 fileOffset,
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UINT64 fragmentSize,
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void **fragmentContext)
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{
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// We are required to do bounds checking.
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if (fileOffset + fragmentSize > mData.size()) {
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return E_FAIL;
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}
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// truncate the 64 bit fileOffset to size_t sized index into mData
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size_t index = static_cast<size_t>(fileOffset);
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// We should be alive for the duration of this.
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*fragmentStart = &mData[index];
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*fragmentContext = nullptr;
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return S_OK;
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}
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void STDMETHODCALLTYPE
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DWriteFontFileStream::ReleaseFileFragment(void *fragmentContext)
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{
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}
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ScaledFontDWrite::ScaledFontDWrite(uint8_t *aData, uint32_t aSize,
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uint32_t aIndex, Float aGlyphSize)
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: ScaledFontBase(aGlyphSize)
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{
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IDWriteFactory *factory = DrawTargetD2D::GetDWriteFactory();
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ffReferenceKey key;
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key.mData = aData;
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key.mSize = aSize;
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RefPtr<IDWriteFontFile> fontFile;
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if (FAILED(factory->CreateCustomFontFileReference(&key, sizeof(ffReferenceKey), DWriteFontFileLoader::Instance(), byRef(fontFile)))) {
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gfxWarning() << "Failed to load font file from data!";
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return;
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}
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IDWriteFontFile *ff = fontFile;
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if (FAILED(factory->CreateFontFace(DWRITE_FONT_FACE_TYPE_TRUETYPE, 1, &ff, aIndex, DWRITE_FONT_SIMULATIONS_NONE, byRef(mFontFace)))) {
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gfxWarning() << "Failed to create font face from font file data!";
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}
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}
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TemporaryRef<Path>
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ScaledFontDWrite::GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget *aTarget)
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{
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if (aTarget->GetType() != BACKEND_DIRECT2D) {
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return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
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}
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RefPtr<PathBuilder> pathBuilder = aTarget->CreatePathBuilder();
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PathBuilderD2D *pathBuilderD2D =
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static_cast<PathBuilderD2D*>(pathBuilder.get());
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CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
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return pathBuilder->Finish();
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}
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void
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ScaledFontDWrite::CopyGlyphsToBuilder(const GlyphBuffer &aBuffer, PathBuilder *aBuilder, BackendType aBackendType, const Matrix *aTransformHint)
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{
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if (aBackendType != BACKEND_DIRECT2D) {
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ScaledFontBase::CopyGlyphsToBuilder(aBuffer, aBuilder, aBackendType, aTransformHint);
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return;
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}
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PathBuilderD2D *pathBuilderD2D =
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static_cast<PathBuilderD2D*>(aBuilder);
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CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
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}
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void
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ScaledFontDWrite::CopyGlyphsToSink(const GlyphBuffer &aBuffer, ID2D1GeometrySink *aSink)
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{
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std::vector<UINT16> indices;
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std::vector<FLOAT> advances;
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std::vector<DWRITE_GLYPH_OFFSET> offsets;
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indices.resize(aBuffer.mNumGlyphs);
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advances.resize(aBuffer.mNumGlyphs);
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offsets.resize(aBuffer.mNumGlyphs);
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memset(&advances.front(), 0, sizeof(FLOAT) * aBuffer.mNumGlyphs);
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for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
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indices[i] = aBuffer.mGlyphs[i].mIndex;
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offsets[i].advanceOffset = aBuffer.mGlyphs[i].mPosition.x;
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offsets[i].ascenderOffset = -aBuffer.mGlyphs[i].mPosition.y;
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}
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mFontFace->GetGlyphRunOutline(mSize, &indices.front(), &advances.front(),
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&offsets.front(), aBuffer.mNumGlyphs,
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FALSE, FALSE, aSink);
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}
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bool
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ScaledFontDWrite::GetFontFileData(FontFileDataOutput aDataCallback, void *aBaton)
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{
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UINT32 fileCount = 0;
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mFontFace->GetFiles(&fileCount, nullptr);
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if (fileCount > 1) {
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MOZ_ASSERT(false);
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return false;
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}
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RefPtr<IDWriteFontFile> file;
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mFontFace->GetFiles(&fileCount, byRef(file));
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const void *referenceKey;
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UINT32 refKeySize;
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// XXX - This can currently crash for webfonts, as when we get the reference
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// key out of the file, that can be an invalid reference key for the loader
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// we use it with. The fix to this is not obvious but it will probably
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// have to happen inside thebes.
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file->GetReferenceKey(&referenceKey, &refKeySize);
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RefPtr<IDWriteFontFileLoader> loader;
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file->GetLoader(byRef(loader));
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RefPtr<IDWriteFontFileStream> stream;
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loader->CreateStreamFromKey(referenceKey, refKeySize, byRef(stream));
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UINT64 fileSize64;
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stream->GetFileSize(&fileSize64);
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if (fileSize64 > UINT32_MAX) {
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MOZ_ASSERT(false);
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return false;
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}
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uint32_t fileSize = static_cast<uint32_t>(fileSize64);
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const void *fragmentStart;
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void *context;
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stream->ReadFileFragment(&fragmentStart, 0, fileSize, &context);
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aDataCallback((uint8_t*)fragmentStart, fileSize, mFontFace->GetIndex(), mSize, aBaton);
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stream->ReleaseFileFragment(context);
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return true;
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}
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AntialiasMode
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ScaledFontDWrite::GetDefaultAAMode()
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{
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AntialiasMode defaultMode = AA_SUBPIXEL;
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switch (GetSystemTextQuality()) {
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case CLEARTYPE_QUALITY:
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defaultMode = AA_SUBPIXEL;
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break;
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case ANTIALIASED_QUALITY:
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defaultMode = AA_GRAY;
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break;
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case DEFAULT_QUALITY:
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defaultMode = AA_NONE;
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break;
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}
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if (defaultMode == AA_GRAY) {
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if (!DoGrayscale(mFontFace, mSize)) {
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defaultMode = AA_NONE;
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}
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}
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return defaultMode;
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}
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}
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}
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