michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: // vim:set ts=2 sts=2 sw=2 et cin:
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "MacIOSurface.h"
michael@0: #include <OpenGL/gl.h>
michael@0: #include <QuartzCore/QuartzCore.h>
michael@0: #include <dlfcn.h>
michael@0: #include "mozilla/RefPtr.h"
michael@0: #include "mozilla/Assertions.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: // IOSurface signatures
michael@0: #define IOSURFACE_FRAMEWORK_PATH \
michael@0:   "/System/Library/Frameworks/IOSurface.framework/IOSurface"
michael@0: #define OPENGL_FRAMEWORK_PATH \
michael@0:   "/System/Library/Frameworks/OpenGL.framework/OpenGL"
michael@0: #define COREGRAPHICS_FRAMEWORK_PATH \
michael@0:   "/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework/CoreGraphics"
michael@0: 
michael@0: 
michael@0: 
michael@0: #define GET_CONST(const_name) \
michael@0:   ((CFStringRef*) dlsym(sIOSurfaceFramework, const_name))
michael@0: #define GET_IOSYM(dest,sym_name) \
michael@0:   (typeof(dest)) dlsym(sIOSurfaceFramework, sym_name)
michael@0: #define GET_CGLSYM(dest,sym_name) \
michael@0:   (typeof(dest)) dlsym(sOpenGLFramework, sym_name)
michael@0: #define GET_CGSYM(dest,sym_name) \
michael@0:   (typeof(dest)) dlsym(sCoreGraphicsFramework, sym_name)
michael@0: 
michael@0: MacIOSurfaceLib::LibraryUnloader MacIOSurfaceLib::sLibraryUnloader;
michael@0: bool                          MacIOSurfaceLib::isLoaded = false;
michael@0: void*                         MacIOSurfaceLib::sIOSurfaceFramework;
michael@0: void*                         MacIOSurfaceLib::sOpenGLFramework;
michael@0: void*                         MacIOSurfaceLib::sCoreGraphicsFramework;
michael@0: IOSurfaceCreateFunc           MacIOSurfaceLib::sCreate;
michael@0: IOSurfaceGetIDFunc            MacIOSurfaceLib::sGetID;
michael@0: IOSurfaceLookupFunc           MacIOSurfaceLib::sLookup;
michael@0: IOSurfaceGetBaseAddressFunc   MacIOSurfaceLib::sGetBaseAddress;
michael@0: IOSurfaceGetWidthFunc         MacIOSurfaceLib::sWidth;
michael@0: IOSurfaceGetHeightFunc        MacIOSurfaceLib::sHeight;
michael@0: IOSurfaceGetBytesPerRowFunc   MacIOSurfaceLib::sBytesPerRow;
michael@0: IOSurfaceLockFunc             MacIOSurfaceLib::sLock;
michael@0: IOSurfaceUnlockFunc           MacIOSurfaceLib::sUnlock;
michael@0: CGLTexImageIOSurface2DFunc    MacIOSurfaceLib::sTexImage;
michael@0: IOSurfaceContextCreateFunc    MacIOSurfaceLib::sIOSurfaceContextCreate;
michael@0: IOSurfaceContextCreateImageFunc   MacIOSurfaceLib::sIOSurfaceContextCreateImage;
michael@0: IOSurfaceContextGetSurfaceFunc    MacIOSurfaceLib::sIOSurfaceContextGetSurface;
michael@0: unsigned int                  (*MacIOSurfaceLib::sCGContextGetTypePtr) (CGContextRef) = nullptr;
michael@0: 
michael@0: CFStringRef                   MacIOSurfaceLib::kPropWidth;
michael@0: CFStringRef                   MacIOSurfaceLib::kPropHeight;
michael@0: CFStringRef                   MacIOSurfaceLib::kPropBytesPerElem;
michael@0: CFStringRef                   MacIOSurfaceLib::kPropBytesPerRow;
michael@0: CFStringRef                   MacIOSurfaceLib::kPropIsGlobal;
michael@0: 
michael@0: bool MacIOSurfaceLib::isInit() {
michael@0:   // Guard against trying to reload the library
michael@0:   // if it is not available.
michael@0:   if (!isLoaded)
michael@0:     LoadLibrary();
michael@0:   MOZ_ASSERT(sIOSurfaceFramework);
michael@0:   return sIOSurfaceFramework;
michael@0: }
michael@0: 
michael@0: IOSurfacePtr MacIOSurfaceLib::IOSurfaceCreate(CFDictionaryRef properties) {
michael@0:   return sCreate(properties);
michael@0: }
michael@0: 
michael@0: IOSurfacePtr MacIOSurfaceLib::IOSurfaceLookup(IOSurfaceID aIOSurfaceID) {
michael@0:   return sLookup(aIOSurfaceID);
michael@0: }
michael@0: 
michael@0: IOSurfaceID MacIOSurfaceLib::IOSurfaceGetID(IOSurfacePtr aIOSurfacePtr) {
michael@0:   return sGetID(aIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: void* MacIOSurfaceLib::IOSurfaceGetBaseAddress(IOSurfacePtr aIOSurfacePtr) {
michael@0:   return sGetBaseAddress(aIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: size_t MacIOSurfaceLib::IOSurfaceGetWidth(IOSurfacePtr aIOSurfacePtr) {
michael@0:   return sWidth(aIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: size_t MacIOSurfaceLib::IOSurfaceGetHeight(IOSurfacePtr aIOSurfacePtr) {
michael@0:   return sHeight(aIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: size_t MacIOSurfaceLib::IOSurfaceGetBytesPerRow(IOSurfacePtr aIOSurfacePtr) {
michael@0:   return sBytesPerRow(aIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: IOReturn MacIOSurfaceLib::IOSurfaceLock(IOSurfacePtr aIOSurfacePtr, 
michael@0:                                        uint32_t options, uint32_t *seed) {
michael@0:   return sLock(aIOSurfacePtr, options, seed);
michael@0: }
michael@0: 
michael@0: IOReturn MacIOSurfaceLib::IOSurfaceUnlock(IOSurfacePtr aIOSurfacePtr, 
michael@0:                                          uint32_t options, uint32_t *seed) {
michael@0:   return sUnlock(aIOSurfacePtr, options, seed);
michael@0: }
michael@0: 
michael@0: CGLError MacIOSurfaceLib::CGLTexImageIOSurface2D(CGLContextObj ctxt,
michael@0:                              GLenum target, GLenum internalFormat,
michael@0:                              GLsizei width, GLsizei height,
michael@0:                              GLenum format, GLenum type,
michael@0:                              IOSurfacePtr ioSurface, GLuint plane) {
michael@0:   return sTexImage(ctxt, target, internalFormat, width, height,
michael@0:                    format, type, ioSurface, plane);
michael@0: }
michael@0: 
michael@0: CGContextRef MacIOSurfaceLib::IOSurfaceContextCreate(IOSurfacePtr aIOSurfacePtr,
michael@0:                              unsigned aWidth, unsigned aHeight,
michael@0:                              unsigned aBitsPerComponent, unsigned aBytes,
michael@0:                              CGColorSpaceRef aColorSpace, CGBitmapInfo bitmapInfo) {
michael@0:   if (!sIOSurfaceContextCreate)
michael@0:     return nullptr;
michael@0:   return sIOSurfaceContextCreate(aIOSurfacePtr, aWidth, aHeight, aBitsPerComponent, aBytes, aColorSpace, bitmapInfo);
michael@0: }
michael@0: 
michael@0: CGImageRef MacIOSurfaceLib::IOSurfaceContextCreateImage(CGContextRef aContext) {
michael@0:   if (!sIOSurfaceContextCreateImage)
michael@0:     return nullptr;
michael@0:   return sIOSurfaceContextCreateImage(aContext);
michael@0: }
michael@0: 
michael@0: IOSurfacePtr MacIOSurfaceLib::IOSurfaceContextGetSurface(CGContextRef aContext) {
michael@0:   if (!sIOSurfaceContextGetSurface)
michael@0:     return nullptr;
michael@0:   return sIOSurfaceContextGetSurface(aContext);
michael@0: }
michael@0: 
michael@0: CFStringRef MacIOSurfaceLib::GetIOConst(const char* symbole) {
michael@0:   CFStringRef *address = (CFStringRef*)dlsym(sIOSurfaceFramework, symbole);
michael@0:   if (!address)
michael@0:     return nullptr;
michael@0: 
michael@0:   return *address;
michael@0: }
michael@0: 
michael@0: void MacIOSurfaceLib::LoadLibrary() {
michael@0:   if (isLoaded) {
michael@0:     return;
michael@0:   } 
michael@0:   isLoaded = true;
michael@0:   sIOSurfaceFramework = dlopen(IOSURFACE_FRAMEWORK_PATH,
michael@0:                             RTLD_LAZY | RTLD_LOCAL);
michael@0:   sOpenGLFramework = dlopen(OPENGL_FRAMEWORK_PATH,
michael@0:                             RTLD_LAZY | RTLD_LOCAL);
michael@0: 
michael@0:   sCoreGraphicsFramework = dlopen(COREGRAPHICS_FRAMEWORK_PATH,
michael@0:                             RTLD_LAZY | RTLD_LOCAL);
michael@0:   if (!sIOSurfaceFramework || !sOpenGLFramework || !sCoreGraphicsFramework) {
michael@0:     if (sIOSurfaceFramework)
michael@0:       dlclose(sIOSurfaceFramework);
michael@0:     if (sOpenGLFramework)
michael@0:       dlclose(sOpenGLFramework);
michael@0:     if (sCoreGraphicsFramework)
michael@0:       dlclose(sCoreGraphicsFramework);
michael@0:     sIOSurfaceFramework = nullptr;
michael@0:     sOpenGLFramework = nullptr;
michael@0:     sCoreGraphicsFramework = nullptr;
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   kPropWidth = GetIOConst("kIOSurfaceWidth");
michael@0:   kPropHeight = GetIOConst("kIOSurfaceHeight");
michael@0:   kPropBytesPerElem = GetIOConst("kIOSurfaceBytesPerElement");
michael@0:   kPropBytesPerRow = GetIOConst("kIOSurfaceBytesPerRow");
michael@0:   kPropIsGlobal = GetIOConst("kIOSurfaceIsGlobal");
michael@0:   sCreate = GET_IOSYM(sCreate, "IOSurfaceCreate");
michael@0:   sGetID  = GET_IOSYM(sGetID,  "IOSurfaceGetID");
michael@0:   sWidth = GET_IOSYM(sWidth, "IOSurfaceGetWidth");
michael@0:   sHeight = GET_IOSYM(sHeight, "IOSurfaceGetHeight");
michael@0:   sBytesPerRow = GET_IOSYM(sBytesPerRow, "IOSurfaceGetBytesPerRow");
michael@0:   sLookup = GET_IOSYM(sLookup, "IOSurfaceLookup");
michael@0:   sLock = GET_IOSYM(sLock, "IOSurfaceLock");
michael@0:   sUnlock = GET_IOSYM(sUnlock, "IOSurfaceUnlock");
michael@0:   sGetBaseAddress = GET_IOSYM(sGetBaseAddress, "IOSurfaceGetBaseAddress");
michael@0:   sTexImage = GET_CGLSYM(sTexImage, "CGLTexImageIOSurface2D");
michael@0:   sCGContextGetTypePtr = (unsigned int (*)(CGContext*))dlsym(RTLD_DEFAULT, "CGContextGetType");
michael@0: 
michael@0:   // Optional symbols
michael@0:   sIOSurfaceContextCreate = GET_CGSYM(sIOSurfaceContextCreate, "CGIOSurfaceContextCreate");
michael@0:   sIOSurfaceContextCreateImage = GET_CGSYM(sIOSurfaceContextCreateImage, "CGIOSurfaceContextCreateImage");
michael@0:   sIOSurfaceContextGetSurface = GET_CGSYM(sIOSurfaceContextGetSurface, "CGIOSurfaceContextGetSurface");
michael@0: 
michael@0:   if (!sCreate || !sGetID || !sLookup || !sTexImage || !sGetBaseAddress ||
michael@0:       !kPropWidth || !kPropHeight || !kPropBytesPerElem || !kPropIsGlobal ||
michael@0:       !sLock || !sUnlock || !sWidth || !sHeight || !kPropBytesPerRow ||
michael@0:       !sBytesPerRow) {
michael@0:     CloseLibrary();
michael@0:   }
michael@0: }
michael@0: 
michael@0: void MacIOSurfaceLib::CloseLibrary() {
michael@0:   if (sIOSurfaceFramework) {
michael@0:     dlclose(sIOSurfaceFramework);
michael@0:   }
michael@0:   if (sOpenGLFramework) {
michael@0:     dlclose(sOpenGLFramework);
michael@0:   }
michael@0:   sIOSurfaceFramework = nullptr;
michael@0:   sOpenGLFramework = nullptr;
michael@0: }
michael@0: 
michael@0: MacIOSurface::~MacIOSurface() {
michael@0:   CFRelease(mIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: TemporaryRef<MacIOSurface> MacIOSurface::CreateIOSurface(int aWidth, int aHeight,
michael@0:                                                          double aContentsScaleFactor,
michael@0:                                                          bool aHasAlpha) {
michael@0:   if (!MacIOSurfaceLib::isInit() || aContentsScaleFactor <= 0)
michael@0:     return nullptr;
michael@0: 
michael@0:   CFMutableDictionaryRef props = ::CFDictionaryCreateMutable(
michael@0:                       kCFAllocatorDefault, 4,
michael@0:                       &kCFTypeDictionaryKeyCallBacks,
michael@0:                       &kCFTypeDictionaryValueCallBacks);
michael@0:   if (!props)
michael@0:     return nullptr;
michael@0: 
michael@0:   int32_t bytesPerElem = 4;
michael@0:   size_t intScaleFactor = ceil(aContentsScaleFactor);
michael@0:   aWidth *= intScaleFactor;
michael@0:   aHeight *= intScaleFactor;
michael@0:   CFNumberRef cfWidth = ::CFNumberCreate(nullptr, kCFNumberSInt32Type, &aWidth);
michael@0:   CFNumberRef cfHeight = ::CFNumberCreate(nullptr, kCFNumberSInt32Type, &aHeight);
michael@0:   CFNumberRef cfBytesPerElem = ::CFNumberCreate(nullptr, kCFNumberSInt32Type, &bytesPerElem);
michael@0:   ::CFDictionaryAddValue(props, MacIOSurfaceLib::kPropWidth,
michael@0:                                 cfWidth);
michael@0:   ::CFRelease(cfWidth);
michael@0:   ::CFDictionaryAddValue(props, MacIOSurfaceLib::kPropHeight,
michael@0:                                 cfHeight);
michael@0:   ::CFRelease(cfHeight);
michael@0:   ::CFDictionaryAddValue(props, MacIOSurfaceLib::kPropBytesPerElem, 
michael@0:                                 cfBytesPerElem);
michael@0:   ::CFRelease(cfBytesPerElem);
michael@0:   ::CFDictionaryAddValue(props, MacIOSurfaceLib::kPropIsGlobal, 
michael@0:                                 kCFBooleanTrue);
michael@0: 
michael@0:   IOSurfacePtr surfaceRef = MacIOSurfaceLib::IOSurfaceCreate(props);
michael@0:   ::CFRelease(props);
michael@0: 
michael@0:   if (!surfaceRef)
michael@0:     return nullptr;
michael@0: 
michael@0:   RefPtr<MacIOSurface> ioSurface = new MacIOSurface(surfaceRef, aContentsScaleFactor, aHasAlpha);
michael@0:   if (!ioSurface) {
michael@0:     ::CFRelease(surfaceRef);
michael@0:     return nullptr;
michael@0:   }
michael@0: 
michael@0:   return ioSurface.forget();
michael@0: }
michael@0: 
michael@0: TemporaryRef<MacIOSurface> MacIOSurface::LookupSurface(IOSurfaceID aIOSurfaceID,
michael@0:                                                        double aContentsScaleFactor,
michael@0:                                                        bool aHasAlpha) { 
michael@0:   if (!MacIOSurfaceLib::isInit() || aContentsScaleFactor <= 0)
michael@0:     return nullptr;
michael@0: 
michael@0:   IOSurfacePtr surfaceRef = MacIOSurfaceLib::IOSurfaceLookup(aIOSurfaceID);
michael@0:   if (!surfaceRef)
michael@0:     return nullptr;
michael@0: 
michael@0:   RefPtr<MacIOSurface> ioSurface = new MacIOSurface(surfaceRef, aContentsScaleFactor, aHasAlpha);
michael@0:   if (!ioSurface) {
michael@0:     ::CFRelease(surfaceRef);
michael@0:     return nullptr;
michael@0:   }
michael@0:   return ioSurface.forget();
michael@0: }
michael@0: 
michael@0: IOSurfaceID MacIOSurface::GetIOSurfaceID() { 
michael@0:   return MacIOSurfaceLib::IOSurfaceGetID(mIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: void* MacIOSurface::GetBaseAddress() { 
michael@0:   return MacIOSurfaceLib::IOSurfaceGetBaseAddress(mIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: size_t MacIOSurface::GetWidth() {
michael@0:   size_t intScaleFactor = ceil(mContentsScaleFactor);
michael@0:   return GetDevicePixelWidth() / intScaleFactor;
michael@0: }
michael@0: 
michael@0: size_t MacIOSurface::GetHeight() {
michael@0:   size_t intScaleFactor = ceil(mContentsScaleFactor);
michael@0:   return GetDevicePixelHeight() / intScaleFactor;
michael@0: }
michael@0: 
michael@0: size_t MacIOSurface::GetDevicePixelWidth() {
michael@0:   return MacIOSurfaceLib::IOSurfaceGetWidth(mIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: size_t MacIOSurface::GetDevicePixelHeight() {
michael@0:   return MacIOSurfaceLib::IOSurfaceGetHeight(mIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: size_t MacIOSurface::GetBytesPerRow() { 
michael@0:   return MacIOSurfaceLib::IOSurfaceGetBytesPerRow(mIOSurfacePtr);
michael@0: }
michael@0: 
michael@0: #define READ_ONLY 0x1
michael@0: void MacIOSurface::Lock() {
michael@0:   MacIOSurfaceLib::IOSurfaceLock(mIOSurfacePtr, READ_ONLY, nullptr);
michael@0: }
michael@0: 
michael@0: void MacIOSurface::Unlock() {
michael@0:   MacIOSurfaceLib::IOSurfaceUnlock(mIOSurfacePtr, READ_ONLY, nullptr);
michael@0: }
michael@0: 
michael@0: #include "SourceSurfaceRawData.h"
michael@0: using mozilla::gfx::SourceSurface;
michael@0: using mozilla::gfx::SourceSurfaceRawData;
michael@0: using mozilla::gfx::IntSize;
michael@0: using mozilla::gfx::SurfaceFormat;
michael@0: 
michael@0: TemporaryRef<SourceSurface>
michael@0: MacIOSurface::GetAsSurface() {
michael@0:   Lock();
michael@0:   size_t bytesPerRow = GetBytesPerRow();
michael@0:   size_t ioWidth = GetDevicePixelWidth();
michael@0:   size_t ioHeight = GetDevicePixelHeight();
michael@0: 
michael@0:   unsigned char* ioData = (unsigned char*)GetBaseAddress();
michael@0:   unsigned char* dataCpy = (unsigned char*)malloc(bytesPerRow*ioHeight);
michael@0:   for (size_t i = 0; i < ioHeight; i++) {
michael@0:     memcpy(dataCpy + i * bytesPerRow,
michael@0:            ioData + i * bytesPerRow, ioWidth * 4);
michael@0:   }
michael@0: 
michael@0:   Unlock();
michael@0: 
michael@0:   SurfaceFormat format = HasAlpha() ? mozilla::gfx::SurfaceFormat::B8G8R8A8 :
michael@0:                                       mozilla::gfx::SurfaceFormat::B8G8R8X8;
michael@0: 
michael@0:   RefPtr<SourceSurfaceRawData> surf = new SourceSurfaceRawData();
michael@0:   surf->InitWrappingData(dataCpy, IntSize(ioWidth, ioHeight), bytesPerRow, format, true);
michael@0: 
michael@0:   return surf.forget();
michael@0: }
michael@0: 
michael@0: CGLError
michael@0: MacIOSurface::CGLTexImageIOSurface2D(CGLContextObj ctx)
michael@0: {
michael@0:   return MacIOSurfaceLib::CGLTexImageIOSurface2D(ctx,
michael@0:                                                 GL_TEXTURE_RECTANGLE_ARB,
michael@0:                                                 HasAlpha() ? GL_RGBA : GL_RGB,
michael@0:                                                 GetDevicePixelWidth(),
michael@0:                                                 GetDevicePixelHeight(),
michael@0:                                                 GL_BGRA,
michael@0:                                                 GL_UNSIGNED_INT_8_8_8_8_REV,
michael@0:                                                 mIOSurfacePtr, 0);
michael@0: }
michael@0: 
michael@0: static
michael@0: CGColorSpaceRef CreateSystemColorSpace() {
michael@0:   CGColorSpaceRef cspace = ::CGDisplayCopyColorSpace(::CGMainDisplayID());
michael@0:   if (!cspace) {
michael@0:     cspace = ::CGColorSpaceCreateDeviceRGB();
michael@0:   }
michael@0:   return cspace;
michael@0: }
michael@0: 
michael@0: CGContextRef MacIOSurface::CreateIOSurfaceContext() {
michael@0:   CGColorSpaceRef cspace = CreateSystemColorSpace();
michael@0:   CGContextRef ref = MacIOSurfaceLib::IOSurfaceContextCreate(mIOSurfacePtr,
michael@0:                                                 GetDevicePixelWidth(),
michael@0:                                                 GetDevicePixelHeight(),
michael@0:                                                 8, 32, cspace, 0x2002);
michael@0:   ::CGColorSpaceRelease(cspace);
michael@0:   return ref;
michael@0: }
michael@0: 
michael@0: CGImageRef MacIOSurface::CreateImageFromIOSurfaceContext(CGContextRef aContext) {
michael@0:   if (!MacIOSurfaceLib::isInit())
michael@0:     return nullptr;
michael@0: 
michael@0:   return MacIOSurfaceLib::IOSurfaceContextCreateImage(aContext);
michael@0: }
michael@0: 
michael@0: TemporaryRef<MacIOSurface> MacIOSurface::IOSurfaceContextGetSurface(CGContextRef aContext,
michael@0:                                                                     double aContentsScaleFactor,
michael@0:                                                                     bool aHasAlpha) {
michael@0:   if (!MacIOSurfaceLib::isInit() || aContentsScaleFactor <= 0)
michael@0:     return nullptr;
michael@0: 
michael@0:   IOSurfacePtr surfaceRef = MacIOSurfaceLib::IOSurfaceContextGetSurface(aContext);
michael@0:   if (!surfaceRef)
michael@0:     return nullptr;
michael@0: 
michael@0:   // Retain the IOSurface because MacIOSurface will release it
michael@0:   CFRetain(surfaceRef);
michael@0: 
michael@0:   RefPtr<MacIOSurface> ioSurface = new MacIOSurface(surfaceRef, aContentsScaleFactor, aHasAlpha);
michael@0:   if (!ioSurface) {
michael@0:     ::CFRelease(surfaceRef);
michael@0:     return nullptr;
michael@0:   }
michael@0:   return ioSurface.forget();
michael@0: }
michael@0: 
michael@0: 
michael@0: CGContextType GetContextType(CGContextRef ref)
michael@0: {
michael@0:   if (!MacIOSurfaceLib::isInit() || !MacIOSurfaceLib::sCGContextGetTypePtr)
michael@0:     return CG_CONTEXT_TYPE_UNKNOWN;
michael@0: 
michael@0:   unsigned int type = MacIOSurfaceLib::sCGContextGetTypePtr(ref);
michael@0:   if (type == CG_CONTEXT_TYPE_BITMAP) {
michael@0:     return CG_CONTEXT_TYPE_BITMAP;
michael@0:   } else if (type == CG_CONTEXT_TYPE_IOSURFACE) {
michael@0:     return CG_CONTEXT_TYPE_IOSURFACE;
michael@0:   } else {
michael@0:     return CG_CONTEXT_TYPE_UNKNOWN;
michael@0:   }
michael@0: }
michael@0: 
michael@0: