/* * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved. * Copyright (c) 2010 JogAmp Community. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * - Redistribution of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistribution 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 Sun Microsystems, Inc. or the names of * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed or intended for use * in the design, construction, operation or maintenance of any nuclear * facility. * * Sun gratefully acknowledges that this software was originally authored * and developed by Kenneth Bradley Russell and Christopher John Kline. */ package jogamp.opengl.windows.wgl; import java.nio.Buffer; import java.nio.ShortBuffer; import java.util.Collection; import java.util.HashMap; import java.util.List; import javax.media.nativewindow.AbstractGraphicsConfiguration; import javax.media.nativewindow.AbstractGraphicsDevice; import javax.media.nativewindow.AbstractGraphicsScreen; import javax.media.nativewindow.DefaultGraphicsScreen; import javax.media.nativewindow.NativeSurface; import javax.media.nativewindow.ProxySurface; import javax.media.nativewindow.UpstreamSurfaceHook; import javax.media.opengl.GL; import javax.media.opengl.GLCapabilities; import javax.media.opengl.GLCapabilitiesChooser; import javax.media.opengl.GLCapabilitiesImmutable; import javax.media.opengl.GLContext; import javax.media.opengl.GLDrawable; import javax.media.opengl.GLException; import javax.media.opengl.GLProfile; import jogamp.nativewindow.WrappedSurface; import jogamp.nativewindow.windows.GDI; import jogamp.nativewindow.windows.GDIDummyUpstreamSurfaceHook; import jogamp.nativewindow.windows.GDISurface; import jogamp.nativewindow.windows.RegisteredClassFactory; import jogamp.opengl.DesktopGLDynamicLookupHelper; import jogamp.opengl.GLContextImpl; import jogamp.opengl.GLDrawableFactoryImpl; import jogamp.opengl.GLDrawableImpl; import jogamp.opengl.GLDynamicLookupHelper; import jogamp.opengl.GLGraphicsConfigurationUtil; import jogamp.opengl.SharedResourceRunner; import com.jogamp.common.nio.PointerBuffer; import com.jogamp.common.os.Platform; import com.jogamp.common.util.ReflectionUtil; import com.jogamp.common.util.VersionNumber; import com.jogamp.nativewindow.windows.WindowsGraphicsDevice; import com.jogamp.opengl.GLExtensions; public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl { private static DesktopGLDynamicLookupHelper windowsWGLDynamicLookupHelper = null; public WindowsWGLDrawableFactory() { super(); synchronized(WindowsWGLDrawableFactory.class) { if(null==windowsWGLDynamicLookupHelper) { DesktopGLDynamicLookupHelper tmp = null; try { tmp = new DesktopGLDynamicLookupHelper(new WindowsWGLDynamicLibraryBundleInfo()); } catch (GLException gle) { if(DEBUG) { gle.printStackTrace(); } } if(null!=tmp && tmp.isLibComplete()) { windowsWGLDynamicLookupHelper = tmp; WGL.getWGLProcAddressTable().reset(windowsWGLDynamicLookupHelper); } } } defaultDevice = new WindowsGraphicsDevice(AbstractGraphicsDevice.DEFAULT_UNIT); if(null!=windowsWGLDynamicLookupHelper) { // Register our GraphicsConfigurationFactory implementations // The act of constructing them causes them to be registered WindowsWGLGraphicsConfigurationFactory.registerFactory(); if(GLProfile.isAWTAvailable()) { try { ReflectionUtil.callStaticMethod("jogamp.opengl.windows.wgl.awt.WindowsAWTWGLGraphicsConfigurationFactory", "registerFactory", null, null, getClass().getClassLoader()); } catch (Exception jre) { /* n/a .. */ } } sharedMap = new HashMap(); // Init shared resources off thread // Will be released via ShutdownHook sharedResourceRunner = new SharedResourceRunner(new SharedResourceImplementation()); sharedResourceRunner.start(); } } @Override protected final boolean isComplete() { return null != windowsWGLDynamicLookupHelper; } @Override protected final void destroy() { if(null != sharedResourceRunner) { sharedResourceRunner.stop(); sharedResourceRunner = null; } if(null != sharedMap) { sharedMap.clear(); sharedMap = null; } defaultDevice = null; /** * Pulling away the native library may cause havoc .. * windowsWGLDynamicLookupHelper.destroy(); */ windowsWGLDynamicLookupHelper = null; RegisteredClassFactory.shutdownSharedClasses(); } @Override public GLDynamicLookupHelper getGLDynamicLookupHelper(int profile) { return windowsWGLDynamicLookupHelper; } private WindowsGraphicsDevice defaultDevice; private SharedResourceRunner sharedResourceRunner; private HashMap sharedMap; private long processAffinityChanges = 0; private PointerBuffer procMask = PointerBuffer.allocateDirect(1); private PointerBuffer sysMask = PointerBuffer.allocateDirect(1); @Override protected void enterThreadCriticalZone() { synchronized (sysMask) { if( 0 == processAffinityChanges) { long pid = GDI.GetCurrentProcess(); if ( GDI.GetProcessAffinityMask(pid, procMask, sysMask) ) { if(DEBUG) { System.err.println("WindowsWGLDrawableFactory.enterThreadCriticalZone() - 0x" + Long.toHexString(pid) + " - " + getThreadName()); // Thread.dumpStack(); } processAffinityChanges = pid; GDI.SetProcessAffinityMask(pid, 1); } } } } @Override protected void leaveThreadCriticalZone() { synchronized (sysMask) { if( 0 != processAffinityChanges) { long pid = GDI.GetCurrentProcess(); if( pid != processAffinityChanges) { throw new GLException("PID doesn't match: set PID 0x" + Long.toHexString(processAffinityChanges) + " this PID 0x" + Long.toHexString(pid) ); } if(DEBUG) { System.err.println("WindowsWGLDrawableFactory.leaveThreadCriticalZone() - 0x" + Long.toHexString(pid) + " - " + getThreadName()); } GDI.SetProcessAffinityMask(pid, sysMask.get(0)); } } } /** * http://msdn.microsoft.com/en-us/library/ms724832%28v=vs.85%29.aspx * Windows XP 5.1 */ static final VersionNumber winXPVersionNumber = new VersionNumber ( 5, 1, 0); static class SharedResource implements SharedResourceRunner.Resource { private WindowsGraphicsDevice device; private AbstractGraphicsScreen screen; private GLDrawableImpl drawable; private GLContextImpl context; private boolean hasARBPixelFormat; private boolean hasARBMultisample; private boolean hasARBPBuffer; private boolean hasARBReadDrawable; private String vendor; private boolean isVendorATI; private boolean isVendorNVIDIA; private boolean needsCurrenContext4ARBPFDQueries; SharedResource(WindowsGraphicsDevice dev, AbstractGraphicsScreen scrn, GLDrawableImpl draw, GLContextImpl ctx, boolean arbPixelFormat, boolean arbMultisample, boolean arbPBuffer, boolean arbReadDrawable, String glVendor) { device = dev; screen = scrn; drawable = draw; context = ctx; hasARBPixelFormat = arbPixelFormat; hasARBMultisample = arbMultisample; hasARBPBuffer = arbPBuffer; hasARBReadDrawable = arbReadDrawable; vendor = glVendor; if(null != vendor) { isVendorNVIDIA = vendor.startsWith("NVIDIA") ; isVendorATI = vendor.startsWith("ATI") ; } if ( isVendorATI() ) { final VersionNumber winVersion = Platform.getOSVersionNumber(); final boolean isWinXPOrLess = winVersion.compareTo(winXPVersionNumber) <= 0; if(DEBUG) { System.err.println("needsCurrenContext4ARBPFDQueries: "+winVersion+" <= "+winXPVersionNumber+" = "+isWinXPOrLess+" - "+Platform.getOSVersion()); } needsCurrenContext4ARBPFDQueries = isWinXPOrLess; } else { if(DEBUG) { System.err.println("needsCurrenContext4ARBPFDQueries: false"); } needsCurrenContext4ARBPFDQueries = false; } } @Override final public AbstractGraphicsDevice getDevice() { return device; } @Override final public AbstractGraphicsScreen getScreen() { return screen; } @Override final public GLDrawableImpl getDrawable() { return drawable; } @Override final public GLContextImpl getContext() { return context; } final boolean hasARBPixelFormat() { return hasARBPixelFormat; } final boolean hasARBMultisample() { return hasARBMultisample; } final boolean hasARBPBuffer() { return hasARBPBuffer; } final boolean hasReadDrawable() { return hasARBReadDrawable; } final String vendor() { return vendor; } final boolean isVendorATI() { return isVendorATI; } final boolean isVendorNVIDIA() { return isVendorNVIDIA; } /** * Solves bug #480 * * TODO: Validate if bug is actually relates to the 'old' ATI Windows driver for old GPU's like X300 etc * and unrelated to the actual Windows version ! * * @return true if GL_VENDOR is ATI _and_ platform is Windows version XP or less! */ final boolean needsCurrentContext4ARBPFDQueries() { return needsCurrenContext4ARBPFDQueries; } } class SharedResourceImplementation implements SharedResourceRunner.Implementation { @Override public void clear() { synchronized(sharedMap) { sharedMap.clear(); } } @Override public SharedResourceRunner.Resource mapPut(String connection, SharedResourceRunner.Resource resource) { synchronized(sharedMap) { return sharedMap.put(connection, resource); } } @Override public SharedResourceRunner.Resource mapGet(String connection) { synchronized(sharedMap) { return sharedMap.get(connection); } } @Override public Collection mapValues() { synchronized(sharedMap) { return sharedMap.values(); } } @Override public boolean isDeviceSupported(String connection) { return true; } @Override public SharedResourceRunner.Resource createSharedResource(String connection) { final WindowsGraphicsDevice sharedDevice = new WindowsGraphicsDevice(connection, AbstractGraphicsDevice.DEFAULT_UNIT); sharedDevice.lock(); try { final AbstractGraphicsScreen absScreen = new DefaultGraphicsScreen(sharedDevice, 0); final GLProfile glp = GLProfile.get(sharedDevice, GLProfile.GL_PROFILE_LIST_MIN_DESKTOP, false); if (null == glp) { throw new GLException("Couldn't get default GLProfile for device: "+sharedDevice); } final GLCapabilitiesImmutable caps = new GLCapabilities(glp); final GLDrawableImpl sharedDrawable = createOnscreenDrawableImpl(createDummySurfaceImpl(sharedDevice, false, caps, caps, null, 64, 64)); sharedDrawable.setRealized(true); final GLContextImpl sharedContext = (GLContextImpl) sharedDrawable.createContext(null); if (null == sharedContext) { throw new GLException("Couldn't create shared context for drawable: "+sharedDrawable); } boolean hasARBPixelFormat; boolean hasARBMultisample; boolean hasARBPBuffer; boolean hasARBReadDrawableAvailable; String vendor; sharedContext.makeCurrent(); try { hasARBPixelFormat = sharedContext.isExtensionAvailable(WGL_ARB_pixel_format); hasARBMultisample = sharedContext.isExtensionAvailable(WGL_ARB_multisample); hasARBPBuffer = sharedContext.isExtensionAvailable(GLExtensions.ARB_pbuffer); hasARBReadDrawableAvailable = sharedContext.isExtensionAvailable(WGL_ARB_make_current_read) && sharedContext.isFunctionAvailable(wglMakeContextCurrent); vendor = sharedContext.getGL().glGetString(GL.GL_VENDOR); } finally { sharedContext.release(); } if (DEBUG) { System.err.println("SharedDevice: " + sharedDevice); System.err.println("SharedScreen: " + absScreen); System.err.println("SharedContext: " + sharedContext); System.err.println("pixelformat: " + hasARBPixelFormat); System.err.println("multisample: " + hasARBMultisample); System.err.println("pbuffer: " + hasARBPBuffer); System.err.println("readDrawable: " + hasARBReadDrawableAvailable); System.err.println("vendor: " + vendor); } return new SharedResource(sharedDevice, absScreen, sharedDrawable, sharedContext, hasARBPixelFormat, hasARBMultisample, hasARBPBuffer, hasARBReadDrawableAvailable, vendor); } catch (Throwable t) { throw new GLException("WindowsWGLDrawableFactory - Could not initialize shared resources for "+connection, t); } finally { sharedDevice.unlock(); } } @Override public void releaseSharedResource(SharedResourceRunner.Resource shared) { SharedResource sr = (SharedResource) shared; if (DEBUG) { System.err.println("Shutdown Shared:"); System.err.println("Device : " + sr.device); System.err.println("Screen : " + sr.screen); System.err.println("Drawable: " + sr.drawable); System.err.println("CTX : " + sr.context); } if (null != sr.context) { // may cause JVM SIGSEGV: sharedContext.destroy(); sr.context = null; } if (null != sr.drawable) { sr.drawable.setRealized(false); sr.drawable = null; } if (null != sr.screen) { sr.screen = null; } if (null != sr.device) { sr.device.close(); sr.device = null; } } } @Override public final AbstractGraphicsDevice getDefaultDevice() { return defaultDevice; } @Override public final boolean getIsDeviceCompatible(AbstractGraphicsDevice device) { if(null!=windowsWGLDynamicLookupHelper && device instanceof WindowsGraphicsDevice) { return true; } return false; } final static String WGL_ARB_pbuffer = "WGL_ARB_pbuffer"; final static String WGL_ARB_pixel_format = "WGL_ARB_pixel_format"; final static String WGL_ARB_multisample = "WGL_ARB_multisample"; final static String WGL_NV_float_buffer = "WGL_NV_float_buffer"; final static String WGL_ARB_make_current_read = "WGL_ARB_make_current_read"; final static String wglMakeContextCurrent = "wglMakeContextCurrent"; @Override protected final Thread getSharedResourceThread() { return sharedResourceRunner.start(); } @Override protected final boolean createSharedResource(AbstractGraphicsDevice device) { try { SharedResourceRunner.Resource sr = sharedResourceRunner.getOrCreateShared(device); if(null!=sr) { return null != sr.getContext(); } } catch (GLException gle) { if(DEBUG) { System.err.println("Catched Exception on thread "+getThreadName()); gle.printStackTrace(); } } return false; } @Override protected final GLContext getOrCreateSharedContextImpl(AbstractGraphicsDevice device) { SharedResourceRunner.Resource sr = sharedResourceRunner.getOrCreateShared(device); if(null!=sr) { return sr.getContext(); } return null; } @Override protected AbstractGraphicsDevice getOrCreateSharedDeviceImpl(AbstractGraphicsDevice device) { SharedResourceRunner.Resource sr = sharedResourceRunner.getOrCreateShared(device); if(null!=sr) { return sr.getDevice(); } return null; } protected WindowsWGLDrawable getOrCreateSharedDrawable(AbstractGraphicsDevice device) { SharedResourceRunner.Resource sr = sharedResourceRunner.getOrCreateShared(device); if(null!=sr) { return (WindowsWGLDrawable) sr.getDrawable(); } return null; } SharedResource getOrCreateSharedResource(AbstractGraphicsDevice device) { return (SharedResource) sharedResourceRunner.getOrCreateShared(device); } @Override protected List getAvailableCapabilitiesImpl(AbstractGraphicsDevice device) { return WindowsWGLGraphicsConfigurationFactory.getAvailableCapabilities(this, device); } @Override protected final GLDrawableImpl createOnscreenDrawableImpl(NativeSurface target) { if (target == null) { throw new IllegalArgumentException("Null target"); } return new WindowsOnscreenWGLDrawable(this, target); } @Override protected final GLDrawableImpl createOffscreenDrawableImpl(final NativeSurface target) { if (target == null) { throw new IllegalArgumentException("Null target"); } AbstractGraphicsConfiguration config = target.getGraphicsConfiguration(); GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable) config.getChosenCapabilities(); if(!chosenCaps.isPBuffer()) { return new WindowsBitmapWGLDrawable(this, target); } // PBuffer GLDrawable Creation GLDrawableImpl pbufferDrawable; final AbstractGraphicsDevice device = config.getScreen().getDevice(); /** * Similar to ATI Bug https://bugzilla.mozilla.org/show_bug.cgi?id=486277, * we need to have a context current on the same Display to create a PBuffer. */ final SharedResource sr = (SharedResource) sharedResourceRunner.getOrCreateShared(device); if(null!=sr) { GLContext lastContext = GLContext.getCurrent(); if (lastContext != null) { lastContext.release(); } sr.context.makeCurrent(); try { pbufferDrawable = new WindowsPbufferWGLDrawable(WindowsWGLDrawableFactory.this, target); } finally { sr.context.release(); if (lastContext != null) { lastContext.makeCurrent(); } } } else { pbufferDrawable = new WindowsPbufferWGLDrawable(WindowsWGLDrawableFactory.this, target); } return pbufferDrawable; } /** * @return 1 if read drawable extension is available, 0 if not * and -1 if undefined yet, ie no shared device exist at this point. */ public final int isReadDrawableAvailable(AbstractGraphicsDevice device) { SharedResource sr = (SharedResource) sharedResourceRunner.getOrCreateShared((null!=device)?device:defaultDevice); if(null!=sr) { return sr.hasReadDrawable() ? 1 : 0 ; } return -1; // undefined } @Override public final boolean canCreateGLPbuffer(AbstractGraphicsDevice device) { SharedResource sr = (SharedResource) sharedResourceRunner.getOrCreateShared((null!=device)?device:defaultDevice); if(null!=sr) { return sr.hasARBPBuffer(); } return false; } @Override protected final ProxySurface createMutableSurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstreamHook) { final WindowsGraphicsDevice device; if(createNewDevice || !(deviceReq instanceof WindowsGraphicsDevice)) { device = new WindowsGraphicsDevice(deviceReq.getConnection(), deviceReq.getUnitID()); } else { device = (WindowsGraphicsDevice)deviceReq; } final AbstractGraphicsScreen screen = new DefaultGraphicsScreen(device, 0); final WindowsWGLGraphicsConfiguration config = WindowsWGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsChosen, capsRequested, chooser, screen); if(null == config) { throw new GLException("Choosing GraphicsConfiguration failed w/ "+capsChosen+" on "+screen); } return new WrappedSurface(config, 0, upstreamHook, createNewDevice); } @Override public final ProxySurface createDummySurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, GLCapabilitiesImmutable chosenCaps, GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser, int width, int height) { final WindowsGraphicsDevice device; if( createNewDevice || !(deviceReq instanceof WindowsGraphicsDevice) ) { device = new WindowsGraphicsDevice(deviceReq.getConnection(), deviceReq.getUnitID()); } else { device = (WindowsGraphicsDevice)deviceReq; } final AbstractGraphicsScreen screen = new DefaultGraphicsScreen(device, 0); chosenCaps = GLGraphicsConfigurationUtil.fixOnscreenGLCapabilities(chosenCaps); final WindowsWGLGraphicsConfiguration config = WindowsWGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(chosenCaps, requestedCaps, chooser, screen); if(null == config) { throw new GLException("Choosing GraphicsConfiguration failed w/ "+chosenCaps+" on "+screen); } return new GDISurface(config, 0, new GDIDummyUpstreamSurfaceHook(width, height), createNewDevice); } @Override protected final ProxySurface createProxySurfaceImpl(AbstractGraphicsDevice deviceReq, int screenIdx, long windowHandle, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstream) { final WindowsGraphicsDevice device = new WindowsGraphicsDevice(deviceReq.getConnection(), deviceReq.getUnitID()); final AbstractGraphicsScreen screen = new DefaultGraphicsScreen(device, screenIdx); final WindowsWGLGraphicsConfiguration cfg = WindowsWGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsRequested, capsRequested, chooser, screen); return new GDISurface(cfg, windowHandle, upstream, true); } @Override protected final GLContext createExternalGLContextImpl() { return WindowsExternalWGLContext.create(this, null); } @Override public final boolean canCreateExternalGLDrawable(AbstractGraphicsDevice device) { return true; } @Override protected final GLDrawable createExternalGLDrawableImpl() { return WindowsExternalWGLDrawable.create(this, null); } static String wglGetLastError() { long err = GDI.GetLastError(); String detail = null; switch ((int) err) { case GDI.ERROR_SUCCESS: detail = "ERROR_SUCCESS"; break; case GDI.ERROR_INVALID_PIXEL_FORMAT: detail = "ERROR_INVALID_PIXEL_FORMAT"; break; case GDI.ERROR_NO_SYSTEM_RESOURCES: detail = "ERROR_NO_SYSTEM_RESOURCES"; break; case GDI.ERROR_INVALID_DATA: detail = "ERROR_INVALID_DATA"; break; case GDI.ERROR_PROC_NOT_FOUND: detail = "ERROR_PROC_NOT_FOUND"; break; case GDI.ERROR_INVALID_WINDOW_HANDLE:detail = "ERROR_INVALID_WINDOW_HANDLE"; break; default: detail = "(Unknown error code " + err + ")"; break; } return detail; } @Override public final boolean canCreateContextOnJava2DSurface(AbstractGraphicsDevice device) { return false; } @Override public final GLContext createContextOnJava2DSurface(Object graphics, GLContext shareWith) throws GLException { throw new GLException("Unimplemented on this platform"); } //------------------------------------------------------ // Gamma-related functionality // private static final int GAMMA_RAMP_LENGTH = 256; @Override protected final int getGammaRampLength() { return GAMMA_RAMP_LENGTH; } @Override protected final boolean setGammaRamp(float[] ramp) { short[] rampData = new short[3 * GAMMA_RAMP_LENGTH]; for (int i = 0; i < GAMMA_RAMP_LENGTH; i++) { short scaledValue = (short) (ramp[i] * 65535); rampData[i] = scaledValue; rampData[i + GAMMA_RAMP_LENGTH] = scaledValue; rampData[i + 2 * GAMMA_RAMP_LENGTH] = scaledValue; } long screenDC = GDI.GetDC(0); boolean res = GDI.SetDeviceGammaRamp(screenDC, ShortBuffer.wrap(rampData)); GDI.ReleaseDC(0, screenDC); return res; } @Override protected final Buffer getGammaRamp() { ShortBuffer rampData = ShortBuffer.wrap(new short[3 * GAMMA_RAMP_LENGTH]); long screenDC = GDI.GetDC(0); boolean res = GDI.GetDeviceGammaRamp(screenDC, rampData); GDI.ReleaseDC(0, screenDC); if (!res) { return null; } return rampData; } @Override protected final void resetGammaRamp(Buffer originalGammaRamp) { if (originalGammaRamp == null) { // getGammaRamp failed earlier return; } long screenDC = GDI.GetDC(0); GDI.SetDeviceGammaRamp(screenDC, originalGammaRamp); GDI.ReleaseDC(0, screenDC); } }