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/*
* This file is part of the internal font implementation.
*
* Copyright (c) 2010 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
// This file provides additional functionality to the Mac FontPlatformData class
// defined in WebCore/platform/cocoa/FontPlatformDataCocoa.mm .
// Because we want to support loading fonts between processes in the face of
// font loading being blocked by the sandbox, we need a mechnasim to both
// do the loading of in-memory fonts and keep track of them.
#import "config.h"
#import "CrossProcessFontLoading.h"
#import "../graphics/cocoa/FontPlatformData.h"
#import "PlatformBridge.h"
#import <AppKit/NSFont.h>
#import <wtf/HashMap.h>
namespace WebCore {
namespace {
typedef HashMap<ATSFontContainerRef, MemoryActivatedFont*> FontContainerRefMemoryFontHash;
// On 10.5, font loading is not blocked by the sandbox and thus there is no
// need for the cross-process font loading mechanim.
// On system versions >=10.6 cross-process font loading is required.
bool OutOfProcessFontLoadingEnabled()
{
static SInt32 systemVersion = 0;
if (!systemVersion) {
if (Gestalt(gestaltSystemVersion, &systemVersion) != noErr)
return false;
}
return systemVersion >= 0x1060;
}
FontContainerRefMemoryFontHash& fontCacheBySrcFontContainerRef()
{
DEFINE_STATIC_LOCAL(FontContainerRefMemoryFontHash, srcFontRefCache, ());
return srcFontRefCache;
}
ATSFontContainerRef fontContainerRefFromNSFont(NSFont* srcFont)
{
ATSFontRef fontRef = CTFontGetPlatformFont(toCTFontRef(srcFont), 0);
if (!fontRef)
return kATSFontContainerRefUnspecified;
ATSFontContainerRef fontContainer = kATSFontContainerRefUnspecified;
if (ATSFontGetContainer(fontRef, 0, &fontContainer) != noErr)
return kATSFontContainerRefUnspecified;
return fontContainer;
}
// The only way we can tell that an in-process font has failed to load
// is if CTFontCopyGraphicsFont() returns the LastResort font.
bool isLastResortFont(CGFontRef cgFont)
{
NSString* fontName = (NSString*)CGFontCopyPostScriptName(cgFont);
return [fontName isEqualToString:@"LastResort"];
}
// Given an in-process font which has failed to load, return a
// MemoryActivatedFont* corresponding to an in-memory representation of the
// same font loaded from the browser process.
// On failure this function returns a PassRefPtr pointing to 0.
PassRefPtr<MemoryActivatedFont> loadFontFromBrowserProcess(NSFont* nsFont)
{
ATSFontContainerRef container;
// Send cross-process request to load font.
if (!PlatformBridge::loadFont(nsFont, &container))
return 0;
ATSFontContainerRef srcFontContainerRef = fontContainerRefFromNSFont(nsFont);
if (!srcFontContainerRef) {
ATSFontDeactivate(container, 0, kATSOptionFlagsDefault);
return 0;
}
PassRefPtr<MemoryActivatedFont> font = adoptRef(fontCacheBySrcFontContainerRef().get(srcFontContainerRef));
if (font.get())
return font;
return MemoryActivatedFont::create(srcFontContainerRef, container);
}
} // namespace
PassRefPtr<MemoryActivatedFont> MemoryActivatedFont::create(ATSFontContainerRef srcFontContainerRef, ATSFontContainerRef container)
{
MemoryActivatedFont* font = new MemoryActivatedFont(srcFontContainerRef, container);
if (!font->cgFont()) // Object construction failed.
{
delete font;
return 0;
}
return adoptRef(font);
}
MemoryActivatedFont::MemoryActivatedFont(ATSFontContainerRef srcFontContainerRef, ATSFontContainerRef container)
: m_fontContainer(container)
, m_atsFontRef(kATSFontRefUnspecified)
, m_srcFontContainerRef(srcFontContainerRef)
{
if (!container)
return;
// Count the number of fonts in the container.
ItemCount fontCount = 0;
OSStatus err = ATSFontFindFromContainer(container, kATSOptionFlagsDefault, 0, 0, &fontCount);
if (err != noErr || fontCount < 1)
return;
// For now always assume that we want the first font in the container.
ATSFontFindFromContainer(container, kATSOptionFlagsDefault, 1, &m_atsFontRef, 0);
if (!m_atsFontRef)
return;
// Cache CGFont representation of the font.
m_cgFont.adoptCF(CGFontCreateWithPlatformFont(&m_atsFontRef));
if (!m_cgFont.get())
return;
// Add ourselves to cache.
fontCacheBySrcFontContainerRef().add(m_srcFontContainerRef, this);
}
// Destructor - Unload font container from memory and remove ourselves
// from cache.
MemoryActivatedFont::~MemoryActivatedFont()
{
if (m_cgFont.get()) {
// First remove ourselves from the caches.
ASSERT(fontCacheBySrcFontContainerRef().contains(m_srcFontContainerRef));
fontCacheBySrcFontContainerRef().remove(m_srcFontContainerRef);
// Make sure the CGFont is destroyed before its font container.
m_cgFont.releaseRef();
}
if (m_fontContainer != kATSFontContainerRefUnspecified)
ATSFontDeactivate(m_fontContainer, 0, kATSOptionFlagsDefault);
}
// Given an NSFont, try to load a representation of that font into the cgFont
// parameter. If loading is blocked by the sandbox, the font may be loaded
// cross-process.
// If sandbox loading also fails, a fallback font is loaded.
//
// Considerations:
// * cgFont must be CFRelease()ed by the caller when done.
//
// Parameters:
// * nsFont - The font we wish to load.
// * fontSize - point size of the font we wish to load.
// * outNSFont - The font that was actually loaded, may be different from nsFont
// if a fallback font was used.
// * cgFont - on output this contains the CGFontRef corresponding to the NSFont
// that was picked in the end. The caller is responsible for calling
// CFRelease() on this parameter when done with it.
// * fontID - on output, the ID corresponding to nsFont.
void FontPlatformData::loadFont(NSFont* nsFont, float fontSize, NSFont*& outNSFont, CGFontRef& cgFont)
{
outNSFont = nsFont;
cgFont = CTFontCopyGraphicsFont(toCTFontRef(outNSFont), 0);
if (OutOfProcessFontLoadingEnabled() && outNSFont && cgFont && isLastResortFont(cgFont)) {
// Release old CGFontRef since it points at the LastResort font which we don't want.
CFRelease(cgFont);
cgFont = 0;
// Font loading was blocked by the Sandbox.
m_inMemoryFont = loadFontFromBrowserProcess(outNSFont);
if (m_inMemoryFont.get()) {
cgFont = m_inMemoryFont->cgFont();
// Need to add an extra retain so output semantics of this function
// are consistent.
CFRetain(cgFont);
} else {
// If we still can't load the font, then return Times,
// rather than the LastResort font.
outNSFont = [NSFont fontWithName:@"Times" size:fontSize];
cgFont = CTFontCopyGraphicsFont(toCTFontRef(outNSFont), 0);
}
}
}
} // namespace WebCore
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