43
52
SetWTitle(SDL_Window, ptitle); /* MJS */
55
#if SDL_MACCLASSIC_GAMMA_SUPPORT
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* ADC Gamma Ramp support...
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* Mac Gamma Ramp code was originally from sample code provided by
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* Apple Developer Connection, and not written specifically for SDL:
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* "Contains: Functions to enable Mac OS device gamma adjustments using 3 channel 256 element 8 bit gamma ramps
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* Written by: Geoff Stahl (ggs)
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* Copyright: Copyright (c) 1999 Apple Computer, Inc., All Rights Reserved
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* Disclaimer: You may incorporate this sample code into your applications without
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* restriction, though the sample code has been provided "AS IS" and the
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* responsibility for its operation is 100% yours. However, what you are
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* not permitted to do is to redistribute the source as "DSC Sample Code"
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* after having made changes. If you're going to re-distribute the source,
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* we require that you make it clear in the source that the code was
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* descended from Apple Sample Code, but that you've made changes."
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* (The sample code has been integrated into this file, and thus is modified from the original Apple sources.)
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typedef struct recDeviceGamma /* storage for device handle and gamma table */
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GDHandle hGD; /* handle to device */
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GammaTblPtr pDeviceGamma; /* pointer to device gamma table */
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typedef recDeviceGamma * precDeviceGamma;
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typedef struct recSystemGamma /* storage for system devices and gamma tables */
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short numDevices; /* number of devices */
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precDeviceGamma * devGamma; /* array of pointers to device gamma records */
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typedef recSystemGamma * precSystemGamma;
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static Ptr CopyGammaTable (GammaTblPtr pTableGammaIn)
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GammaTblPtr pTableGammaOut = NULL;
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short tableSize, dataWidth;
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if (pTableGammaIn) /* if there is a table to copy */
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dataWidth = (pTableGammaIn->gDataWidth + 7) / 8; /* number of bytes per entry */
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tableSize = sizeof (GammaTbl) + pTableGammaIn->gFormulaSize +
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(pTableGammaIn->gChanCnt * pTableGammaIn->gDataCnt * dataWidth);
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pTableGammaOut = (GammaTblPtr) NewPtr (tableSize); /* allocate new table */
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BlockMove( (Ptr)pTableGammaIn, (Ptr)pTableGammaOut, tableSize); /* move everything */
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return (Ptr)pTableGammaOut; /* return whatever we allocated, could be NULL */
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static OSErr GetGammaTable (GDHandle hGD, GammaTblPtr * ppTableGammaOut)
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VDGammaRecord DeviceGammaRec;
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cParam.ioCompletion = NULL; /* set up control params */
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cParam.ioNamePtr = NULL;
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cParam.ioVRefNum = 0;
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cParam.ioCRefNum = (**hGD).gdRefNum;
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cParam.csCode = cscGetGamma; /* Get Gamma commnd to device */
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*(Ptr *)cParam.csParam = (Ptr) &DeviceGammaRec; /* record for gamma */
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err = PBStatusSync( (ParmBlkPtr)&cParam ); /* get gamma */
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*ppTableGammaOut = (GammaTblPtr)(DeviceGammaRec.csGTable); /* pull table out of record */
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static Ptr GetDeviceGamma (GDHandle hGD)
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GammaTblPtr pTableGammaDevice = NULL;
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GammaTblPtr pTableGammaReturn = NULL;
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err = GetGammaTable (hGD, &pTableGammaDevice); /* get a pointer to the devices table */
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if ((noErr == err) && pTableGammaDevice) /* if succesful */
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pTableGammaReturn = (GammaTblPtr) CopyGammaTable (pTableGammaDevice); /* copy to global */
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return (Ptr) pTableGammaReturn;
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static void DisposeGammaTable (Ptr pGamma)
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DisposePtr((Ptr) pGamma); /* get rid of it */
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static void DisposeSystemGammas (Ptr* ppSystemGammas)
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precSystemGamma pSysGammaIn;
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pSysGammaIn = (precSystemGamma) *ppSystemGammas;
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for (i = 0; i < pSysGammaIn->numDevices; i++) /* for all devices */
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if (pSysGammaIn->devGamma [i]) /* if pointer is valid */
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DisposeGammaTable ((Ptr) pSysGammaIn->devGamma [i]->pDeviceGamma); /* dump gamma table */
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DisposePtr ((Ptr) pSysGammaIn->devGamma [i]); /* dump device info */
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DisposePtr ((Ptr) pSysGammaIn->devGamma); /* dump device pointer array */
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DisposePtr ((Ptr) pSysGammaIn); /* dump system structure */
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*ppSystemGammas = NULL;
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static Boolean GetDeviceGammaRampGD (GDHandle hGD, Ptr pRamp)
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GammaTblPtr pTableGammaTemp = NULL;
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long indexChan, indexEntry;
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if (pRamp) /* ensure pRamp is allocated */
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err = GetGammaTable (hGD, &pTableGammaTemp); /* get a pointer to the current gamma */
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if ((noErr == err) && pTableGammaTemp) /* if successful */
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unsigned char * pEntry = (unsigned char *) &pTableGammaTemp->gFormulaData + pTableGammaTemp->gFormulaSize; /* base of table */
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short bytesPerEntry = (pTableGammaTemp->gDataWidth + 7) / 8; /* size, in bytes, of the device table entries */
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short shiftRightValue = pTableGammaTemp->gDataWidth - 8; /* number of right shifts device -> ramp */
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short channels = pTableGammaTemp->gChanCnt;
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short entries = pTableGammaTemp->gDataCnt;
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if (3 == channels) /* RGB format */
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{ /* note, this will create runs of entries if dest. is bigger (not linear interpolate) */
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for (indexChan = 0; indexChan < channels; indexChan++)
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for (indexEntry = 0; indexEntry < 256; indexEntry++)
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*((unsigned char *) pRamp + (indexChan * 256) + indexEntry) =
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*(pEntry + indexChan * entries * bytesPerEntry + indexEntry * entries * bytesPerEntry / 256) >> shiftRightValue;
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else /* single channel format */
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for (indexChan = 0; indexChan < 768; indexChan += 256) /* repeat for all 3 channels (step by ramp size) */
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for (indexEntry = 0; indexEntry < 256; indexEntry++) /* for all entries set vramp value */
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*((unsigned char *) pRamp + indexChan + indexEntry) =
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*(pEntry + indexEntry * entries * bytesPerEntry / 256) >> shiftRightValue;
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static Ptr GetSystemGammas (void)
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precSystemGamma pSysGammaOut; /* return pointer to system device gamma info */
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short devCount = 0; /* number of devices attached */
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Boolean fail = false;
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pSysGammaOut = (precSystemGamma) NewPtr (sizeof (recSystemGamma)); /* allocate for structure */
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hGDevice = GetDeviceList (); /* top of device list */
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devCount++; /* count devices */
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hGDevice = GetNextDevice (hGDevice); /* next device */
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pSysGammaOut->devGamma = (precDeviceGamma *) NewPtr (sizeof (precDeviceGamma) * devCount); /* allocate for array of pointers to device records */
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pSysGammaOut->numDevices = devCount; /* stuff count */
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devCount = 0; /* reset iteration */
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hGDevice = GetDeviceList ();
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pSysGammaOut->devGamma [devCount] = (precDeviceGamma) NewPtr (sizeof (recDeviceGamma)); /* new device record */
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if (pSysGammaOut->devGamma [devCount]) /* if we actually allocated memory */
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pSysGammaOut->devGamma [devCount]->hGD = hGDevice; /* stuff handle */
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pSysGammaOut->devGamma [devCount]->pDeviceGamma = (GammaTblPtr)GetDeviceGamma (hGDevice); /* copy gamma table */
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else /* otherwise dump record on exit */
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devCount++; /* next device */
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hGDevice = GetNextDevice (hGDevice);
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if (!fail) /* if we did not fail */
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return (Ptr) pSysGammaOut; /* return pointer to structure */
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DisposeSystemGammas ((Ptr *) &pSysGammaOut); /* otherwise dump the current structures (dispose does error checking) */
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return NULL; /* could not complete */
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static void RestoreDeviceGamma (GDHandle hGD, Ptr pGammaTable)
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VDSetEntryRecord setEntriesRec;
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VDGammaRecord gameRecRestore;
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CTabHandle hCTabDeviceColors;
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if (pGammaTable) /* if we have a table to restore */
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gameRecRestore.csGTable = pGammaTable; /* setup restore record */
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csPtr = (Ptr) &gameRecRestore;
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err = Control((**hGD).gdRefNum, cscSetGamma, (Ptr) &csPtr); /* restore gamma */
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if ((noErr == err) && (8 == (**(**hGD).gdPMap).pixelSize)) /* if successful and on an 8 bit device */
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hCTabDeviceColors = (**(**hGD).gdPMap).pmTable; /* do SetEntries to force CLUT update */
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setEntriesRec.csTable = (ColorSpec *) &(**hCTabDeviceColors).ctTable;
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setEntriesRec.csStart = 0;
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setEntriesRec.csCount = (**hCTabDeviceColors).ctSize;
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csPtr = (Ptr) &setEntriesRec;
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err = Control((**hGD).gdRefNum, cscSetEntries, (Ptr) &csPtr); /* SetEntries in CLUT */
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static void RestoreSystemGammas (Ptr pSystemGammas)
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precSystemGamma pSysGammaIn = (precSystemGamma) pSystemGammas;
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for (i = 0; i < pSysGammaIn->numDevices; i++) /* for all devices */
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RestoreDeviceGamma (pSysGammaIn->devGamma [i]->hGD, (Ptr) pSysGammaIn->devGamma [i]->pDeviceGamma); /* restore gamma */
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static Ptr CreateEmptyGammaTable (short channels, short entries, short bits)
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GammaTblPtr pTableGammaOut = NULL;
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short tableSize, dataWidth;
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dataWidth = (bits + 7) / 8; /* number of bytes per entry */
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tableSize = sizeof (GammaTbl) + (channels * entries * dataWidth);
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pTableGammaOut = (GammaTblPtr) NewPtrClear (tableSize); /* allocate new tabel */
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if (pTableGammaOut) /* if we successfully allocated */
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pTableGammaOut->gVersion = 0; /* set parameters based on input */
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pTableGammaOut->gType = 0;
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pTableGammaOut->gFormulaSize = 0;
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pTableGammaOut->gChanCnt = channels;
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pTableGammaOut->gDataCnt = entries;
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pTableGammaOut->gDataWidth = bits;
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return (Ptr)pTableGammaOut; /* return whatever we allocated */
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static Boolean SetDeviceGammaRampGD (GDHandle hGD, Ptr pRamp)
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VDSetEntryRecord setEntriesRec;
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VDGammaRecord gameRecRestore;
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GammaTblPtr pTableGammaNew;
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GammaTblPtr pTableGammaCurrent = NULL;
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CTabHandle hCTabDeviceColors;
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short dataBits, entries, channels = 3; /* force three channels in the gamma table */
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if (pRamp) /* ensure pRamp is allocated */
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err= GetGammaTable (hGD, &pTableGammaCurrent); /* get pointer to current table */
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if ((noErr == err) && pTableGammaCurrent)
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dataBits = pTableGammaCurrent->gDataWidth; /* table must have same data width */
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entries = pTableGammaCurrent->gDataCnt; /* table must be same size */
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pTableGammaNew = (GammaTblPtr) CreateEmptyGammaTable (channels, entries, dataBits); /* our new table */
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if (pTableGammaNew) /* if successful fill table */
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unsigned char * pGammaBase = (unsigned char *) &pTableGammaNew->gFormulaData + pTableGammaNew->gFormulaSize; /* base of table */
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if ((256 == entries) && (8 == dataBits)) /* simple case: direct mapping */
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BlockMove ((Ptr)pRamp, (Ptr)pGammaBase, channels * entries); /* move everything */
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else /* tough case handle entry, channel and data size disparities */
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short indexChan, indexEntry;
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short bytesPerEntry = (dataBits + 7) / 8; /* size, in bytes, of the device table entries */
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short shiftRightValue = 8 - dataBits; /* number of right shifts ramp -> device */
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shiftRightValue += ((bytesPerEntry - 1) * 8); /* multibyte entries and the need to map a byte at a time most sig. to least sig. */
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for (indexChan = 0; indexChan < channels; indexChan++) /* for all the channels */
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for (indexEntry = 0; indexEntry < entries; indexEntry++) /* for all the entries */
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short currentShift = shiftRightValue; /* reset current bit shift */
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long temp = *((unsigned char *)pRamp + (indexChan << 8) + (indexEntry << 8) / entries); /* get data from ramp */
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for (indexByte = 0; indexByte < bytesPerEntry; indexByte++) /* for all bytes */
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if (currentShift < 0) /* shift data correctly for current byte */
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*(pGammaBase++) = temp << -currentShift;
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*(pGammaBase++) = temp >> currentShift;
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currentShift -= 8; /* increment shift to align to next less sig. byte */
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gameRecRestore.csGTable = (Ptr) pTableGammaNew; /* setup restore record */
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csPtr = (Ptr) &gameRecRestore;
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err = Control((**hGD).gdRefNum, cscSetGamma, (Ptr) &csPtr); /* restore gamma (note, display drivers may delay returning from this until VBL) */
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if ((8 == (**(**hGD).gdPMap).pixelSize) && (noErr == err)) /* if successful and on an 8 bit device */
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hCTabDeviceColors = (**(**hGD).gdPMap).pmTable; /* do SetEntries to force CLUT update */
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setEntriesRec.csTable = (ColorSpec *) &(**hCTabDeviceColors).ctTable;
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setEntriesRec.csStart = 0;
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setEntriesRec.csCount = (**hCTabDeviceColors).ctSize;
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csPtr = (Ptr) &setEntriesRec;
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err = Control((**hGD).gdRefNum, cscSetEntries, (Ptr) &csPtr); /* SetEntries in CLUT */
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DisposeGammaTable ((Ptr) pTableGammaNew); /* dump table */
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else /* set NULL gamma -> results in linear map */
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gameRecRestore.csGTable = (Ptr) NULL; /* setup restore record */
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csPtr = (Ptr) &gameRecRestore;
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err = Control((**hGD).gdRefNum, cscSetGamma, (Ptr) &csPtr); /* restore gamma */
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if ((8 == (**(**hGD).gdPMap).pixelSize) && (noErr == err)) /* if successful and on an 8 bit device */
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hCTabDeviceColors = (**(**hGD).gdPMap).pmTable; /* do SetEntries to force CLUT update */
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setEntriesRec.csTable = (ColorSpec *) &(**hCTabDeviceColors).ctTable;
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setEntriesRec.csStart = 0;
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setEntriesRec.csCount = (**hCTabDeviceColors).ctSize;
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csPtr = (Ptr) &setEntriesRec;
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err = Control((**hGD).gdRefNum, cscSetEntries, (Ptr) &csPtr); /* SetEntries in CLUT */
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return false; /* memory allocation or device control failed if we get here */
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/* end of ADC Gamma Ramp support code... */
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static Ptr systemGammaPtr;
398
void Mac_QuitGamma(_THIS)
402
RestoreSystemGammas(systemGammaPtr);
403
DisposeSystemGammas(&systemGammaPtr);
407
static unsigned char shiftedRamp[3 * 256];
409
int Mac_SetGammaRamp(_THIS, Uint16 *ramp)
413
systemGammaPtr = GetSystemGammas();
414
for (i = 0; i < 3 * 256; i++)
416
shiftedRamp[i] = ramp[i] >> 8;
419
if (SetDeviceGammaRampGD(GetMainDevice(), (Ptr) shiftedRamp))
425
int Mac_GetGammaRamp(_THIS, Uint16 *ramp)
427
if (GetDeviceGammaRampGD(GetMainDevice(), (Ptr) shiftedRamp))
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for (i = 0; i < 3 * 256; i++)
432
ramp[i] = shiftedRamp[i] << 8;
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#endif /* SDL_MACCLASSIC_GAMMA_SUPPORT */
added
removed
src/video/maccommon/SDL_macwm.c
