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windows-nt/Source/XPSP1/NT/enduser/netmeeting/as/as16/sbc.c

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2020-09-26 03:20:57 -05:00
//
// SBC.C
// Sent Bitmap Cache
//
// Copyright(c) Microsoft 1997-
//
#include <as16.h>
//
// SBC_DDProcessRequest()
// Handle SBC escapes
//
BOOL SBC_DDProcessRequest
(
UINT fnEscape,
LPOSI_ESCAPE_HEADER pResult,
DWORD cbResult
)
{
BOOL rc;
DebugEntry(SBC_DDProcessRequest);
switch (fnEscape)
{
case SBC_ESC_NEW_CAPABILITIES:
{
TRACE_OUT(("SBC_ESC_NEW_CAPABILITIES"));
ASSERT(cbResult == sizeof(SBC_NEW_CAPABILITIES));
#if 0
SBCDDSetNewCapabilities((LPSBC_NEW_CAPABILITIES)pResult);
#endif
rc = TRUE;
}
break;
default:
{
ERROR_OUT(("Unrecognized SBC_ escape"));
rc = FALSE;
}
break;
}
DebugExitBOOL(SBC_DDProcessRequest, rc);
return(rc);
}
#if 0
//
// FUNCTION: SBCDDSetNewCapabilities
//
// DESCRIPTION:
//
// Set the new SBC related capabilities
//
// RETURNS:
//
// NONE
//
// PARAMETERS:
//
// pDataIn - pointer to the input buffer
//
//
void SBCDDSetNewCapabilities(LPSBC_NEW_CAPABILITIES pCapabilities)
{
DebugEntry(SBCSetNewCapabilities);
//
// Copy the data from the Share Core.
//
g_sbcSendingBPP = pCapabilities->sendingBpp;
hmemcpy(&g_sbcCacheInfo, pCapabilities->cacheInfo, sizeof(g_sbcCacheInfo));
DebugExitVOID(SBCSetNewCapabilities);
}
#endif
//
// SBC_DDInit()
//
BOOL SBC_DDInit
(
HDC hdcScreen,
LPDWORD ppShuntBuffers,
LPDWORD pBitmasks
)
{
UINT i;
BOOL rc = FALSE;
DebugEntry(SBC_DDInit);
#if 0
for (i = 0; i < SBC_NUM_TILE_SIZES; i++)
{
ASSERT(!g_sbcWorkInfo[i].pShuntBuffer);
ASSERT(!g_sbcWorkInfo[i].mruIndex);
ASSERT(!g_sbcWorkInfo[i].workBitmap);
if (i == SBC_SMALL_TILE_INDEX)
{
g_sbcWorkInfo[SBC_SMALL_TILE_INDEX].tileWidth = SBC_SMALL_TILE_WIDTH;
g_sbcWorkInfo[SBC_SMALL_TILE_INDEX].tileHeight = SBC_SMALL_TILE_HEIGHT;
}
else
{
ASSERT(i == SBC_LARGE_TILE_INDEX);
g_sbcWorkInfo[SBC_LARGE_TILE_INDEX].tileWidth = SBC_LARGE_TILE_WIDTH;
g_sbcWorkInfo[SBC_LARGE_TILE_INDEX].tileHeight = SBC_LARGE_TILE_HEIGHT;
}
g_sbcWorkInfo[i].workBitmap = CreateCompatibleBitmap(hdcScreen,
g_sbcWorkInfo[i].tileWidth, g_sbcWorkInfo[i].tileHeight);
if (! g_sbcWorkInfo[i].workBitmap)
{
ERROR_OUT(("Failed to create work bitmap %d", i));
DC_QUIT;
}
SetObjectOwner(g_sbcWorkInfo[i].workBitmap, g_hInstAs16);
MakeObjectPrivate(g_sbcWorkInfo[i].workBitmap, TRUE);
}
//
// Initialize the shunt buffers
//
if (! SBCDDCreateShuntBuffers())
DC_QUIT;
//
// We've created our SBC cache. Fill in the details
//
for (i = 0; i < SBC_NUM_TILE_SIZES; i++)
{
ppShuntBuffers[i] = (DWORD)MapSL(g_sbcWorkInfo[i].pShuntBuffer);
ASSERT(ppShuntBuffers[i]);
}
pBitmasks[0] = g_osiScreenRedMask;
pBitmasks[1] = g_osiScreenGreenMask;
pBitmasks[2] = g_osiScreenBlueMask;
g_sbcPaletteChanged = TRUE;
rc = TRUE;
DC_EXIT_POINT:
#endif
DebugExitBOOL(SBC_DDInit, rc);
return(rc);
}
//
// SBC_DDTerm()
//
void SBC_DDTerm(void)
{
UINT i;
DebugEntry(SBC_DDTerm);
#if 0
//
// Clear out our array and free the shunt buffer memory.
//
for (i = 0 ; i < SBC_NUM_TILE_SIZES ; i++)
{
// Kill the bitmap if we there
if (g_sbcWorkInfo[i].workBitmap)
{
SysDeleteObject(g_sbcWorkInfo[i].workBitmap);
g_sbcWorkInfo[i].workBitmap = NULL;
}
if (g_sbcWorkInfo[i].pShuntBuffer)
{
GlobalFree((HGLOBAL)SELECTOROF(g_sbcWorkInfo[i].pShuntBuffer));
g_sbcWorkInfo[i].pShuntBuffer = NULL;
}
g_sbcWorkInfo[i].mruIndex = 0;
}
#endif
DebugExitVOID(SBC_DDTerm);
}
#if 0
//
// SBC_DDTossFromCache()
// This throws away a bitmap if we'd cached it, which happens when the
// contents change.
//
void SBC_DDTossFromCache
(
HBITMAP hbmp
)
{
DebugEntry(SBC_DDTossFromCache);
DebugExitVOID(SBC_DDTossFromCache);
}
//
//
// SBC_DDIsMemScreenBltCachable() - see sbc.h
//
//
BOOL SBC_DDIsMemScreenBltCachable
(
UINT type,
HDC hdcSrc,
HBITMAP hbmpSrc,
UINT cxSubWidth,
UINT cySubHeight,
HDC hdcDst,
LPBITMAPINFO lpbmi
)
{
BOOL rc = FALSE;
UINT srcBpp;
UINT tileWidth;
UINT tileHeight;
BITMAP bmpDetails;
int bmpWidth;
int bmpHeight;
DebugEntry(SBC_DDIsMemScreenBltCachable);
ASSERT((type == LOWORD(ORD_MEMBLT)) || (type == LOWORD(ORD_MEM3BLT)));
if (g_sbcSendingBPP > 8)
{
TRACE_OUT(( "Unsupported sending bpp %d", g_sbcSendingBPP));
DC_QUIT;
}
//
// If this is a thrasher then don't cache it
//
if (!SBCBitmapCacheAllowed(hbmp))
{
TRACE_OUT(( "Its a thrasher"));
DC_QUIT;
}
//
// Ensure we're not in full screen mode.
//
if (g_asShared->fullScreen)
{
TRACE_OUT(("Not caching SBC; full screen active"));
DC_QUIT;
}
if (hdcSrc && (GetMapMode(hdcSrc) != MM_TEXT))
{
TRACE_OUT(("Not caching SBC; source map mode not MM_TEXT"));
DC_QUIT;
}
if (!hbmp)
{
//
// We don't cache compressed DIB and DIB section bitmaps
//
if (lpbi->bmiHeader.biCompression != BI_RGB)
DC_QUIT;
bmpWidth = lpbi->bmiHeader.biWidth;
bmpHeight = lpbi->bmiHeader.biHeight;
srcBpp = lpbi->bmiHeader.biPlanes * lpbi->bmiHeader.biBitCount;
}
else
{
if (!GetObject(hbmp, sizeof(bmpDetails), &bmpDetails))
{
ERROR_OUT(("Can't get source info"));
DC_QUIT;
}
srcBpp = bmpDetails.bmBitsPixel * bmpDetails.bmPlanes;
bmpWidth = bmpDetails.bmWidth;
bmpHeight = bmpDetails.bmHeight;
}
//
// Oprah394
//
// This function is much too ready to take on work, even when it would
// mean bogging down the host with unnecessary caching work. We
// have no way to determine when an app is doing animation save to
// reject cache requests when the rate looks to be too high.
//
// This function is called for complete source bitmaps before tiling
// so we do not need to worry about confusing tiling with animation.
// The CacheRequests count is decayed in SBC_Periodic
//
//
// MNM0063 - Oprah 394 revisited
//
// If we decide here that we are doing animation, we set the
// sbcAnimating flag for the benefit of other parts of the code. In
// particular, we use this to suppress the comparison of before and
// after states of the screen during a BitBlt operation
//
//
if ((cxSubBitmapWidth != bmpWidth) ||
(cySubBitmapHeight != bmpHeight))
{
TRACE_OUT(("Partial blit - check for slideshow effects"));
g_sbcBltRate++;
if (g_sbcBltRate > SBC_CACHE_DISABLE_RATE)
{
TRACE_OUT(("Excessive cache rate %d - disabled", g_sbcBltRate));
g_sbcAnimating = TRUE;
DC_QUIT;
}
}
//
// MNM63: if we get here, we will assume we're not animating
//
g_sbcAnimating = FALSE;
//
// If the bitmap is 1bpp and the colors are not default then we don't
// cache it (all bitmaps are cached in glorious technicolor!)
//
if ( (srcBpp == 1) &&
( (g_oeState.lpdc->DrawMode.bkColorL != DEFAULT_BG_COLOR) ||
(g_oeState.lpdc->DrawMode.txColorL != DEFAULT_FG_COLOR) ||
(type == LOWORD(ORD_MEM3BLT))) )
{
TRACE_OUT(("Didn't cache mono bitmap with non-default colors"));
DC_QUIT;
}
//
// Check that the cache will accept tiles
//
if (!SBC_DDQueryBitmapTileSize(bmpWidth,
bmpHeight,
&tileWidth,
&tileHeight))
{
TRACE()"Cache does not support tiling"));
DC_QUIT;
}
//
// We are ready to go ahead with the caching!
//
rc = TRUE;
DC_EXIT_POINT:
DebugExitBOOL(SBC_DDIsMemScreenBltCachable, rc);
return(rc);
}
//
//
// SBC_DDCacheMemScreenBlt() - see sbc.h
//
//
BOOL SBC_DDCacheMemScreenBlt
(
LPINT_ORDER pOrder,
LPMEMBLT_ORDER_EXTRA_INFO lpMemBltInfo,
HDC hdcDst
)
{
BOOL rc = FALSE;
LPMEMBLT_ORDER pMemBltOrder = (LPMEMBLT_ORDER)&(pOrder->abOrderData);
LPMEM3BLT_ORDER pMem3BltOrder = (LPMEM3BLT_ORDER)pMemBltOrder;
HBITMAP hBitmap;
HDC hdcSrc;
UINT iCache;
UINT iCacheEntry;
UINT iColorTable;
UINT type;
LPINT pXSrc;
LPINT pYSrc;
UINT srcBpp;
BITMAP bmpDetails;
UINT bmpWidth;
UINT bmpHeight;
UINT tileWidth;
UINT tileHeight;
POINT tileOrg;
UINT cxSubBitmapWidth;
UINT cySubBitmapHeight;
LPBYTE pWorkBits;
RECT destRect;
POINT sourcePt;
int tileSize;
LPSBC_TILE_DATA pTileData = NULL;
DebugEntry(SBC_DDCacheMemScreenBlt);
//
// Do a first pass on the cacheability of the Blt
//
if (!SBC_DDIsMemScreenBltCachable(lpMemBltInfo))
{
TRACE_OUT(( "This MemBlt Order is not cachable"));
DC_QUIT;
}
//
// Get the width and height of the source bitmap
//
pSourceSurf = pMemBltInfo->pSource;
bmpWidth = pSourceSurf->sizlBitmap.cx;
bmpHeight = pSourceSurf->sizlBitmap.cy;
//
// Calculate the tile size for this blit
//
if (!SBC_DDQueryBitmapTileSize(bmpWidth,
bmpHeight,
&tileWidth,
&tileHeight))
{
TRACE_OUT(( "Cache does not support tiling"));
DC_QUIT;
}
//
// Set up pointers to the source coordinates in the order.
//
type = pMemBltOrder->type;
if (type == ORD_MEMBLT_TYPE)
{
sourcePt.x = pMemBltOrder->nXSrc;
sourcePt.y = pMemBltOrder->nYSrc;
TRACE_OUT((
"Request to cache MemBlt (%d, %d), %d x %d -> (%d, %d), src %x",
sourcePt.x,
sourcePt.y,
pMemBltOrder->nWidth,
pMemBltOrder->nHeight,
pMemBltOrder->nLeftRect,
pMemBltOrder->nTopRect,
pSourceSurf->hsurf));
}
else
{
sourcePt.x = pMem3BltOrder->nXSrc;
sourcePt.y = pMem3BltOrder->nYSrc;
TRACE_OUT((
"Request to cache Mem3Blt (%d, %d), %d x %d -> (%d, %d), src %x",
sourcePt.x,
sourcePt.y,
pMem3BltOrder->nWidth,
pMem3BltOrder->nHeight,
pMem3BltOrder->nLeftRect,
pMem3BltOrder->nTopRect,
pSourceSurf->hsurf));
}
//
// Calculate the tile origin and size of remaining bitmap. Origin is
// rounded down to the nearest tile. Actual size of bitmap to cache
// may be smaller than tile size if the tile runs off the right/bottom
// of the bitmap
//
tileOrg.x = sourcePt.x - (sourcePt.x % tileWidth);
tileOrg.y = sourcePt.y - (sourcePt.y % tileHeight);
//
// Actual size of bitmap to cache may be smaller than tile size if the
// tile runs off the right/bottom of the bitmap. To see why this
// calculation is correct, realize that (bmpWidth - tileOrg.x) is the
// remaining width of the bitmap after the start of this tile.
//
cxSubBitmapWidth = min(tileWidth, bmpWidth - tileOrg.x);
cySubBitmapHeight = min(tileHeight, bmpHeight - tileOrg.y);
//
// We know how large a tile we have - we now have to Blt it into one of
// our work bitmaps and pass it up to the share core. First, work out
// which of our work bitmaps we should use and set up some variables
// based on this.
//
for (tileSize=0 ; tileSize<SBC_NUM_TILE_SIZES ; tileSize++)
{
if ((cxSubBitmapWidth <= g_sbcWorkInfo[tileSize].tileWidth) &&
(cySubBitmapHeight <= g_sbcWorkInfo[tileSize].tileHeight))
{
break;
}
}
if (tileSize == SBC_NUM_TILE_SIZES)
{
ERROR_OUT(( "%d x %d tile doesn't fit into work bmp",
cxSubBitmapWidth,
cySubBitmapHeight));
DC_QUIT;
}
//
// Before doing any more work, get the next free entry in the shunt
// buffer. Note that this fills in the tileId element of the returned
// structure.
//
// It is perfectly valid for this call to fail. The shunt buffer may
// just be full if we are sending lots of bitmap data up to the share
// core.
//
if (!SBCDDGetNextFreeTile(tileSize, &pTileData))
{
TRACE_OUT(( "Unable to get a free tile in shunt buffer"));
DC_QUIT;
}
//
// Lock the work bitmap to get a surface to pass to EngBitBlt
//
pWorkSurf = EngLockSurface((HSURF)g_sbcWorkInfo[tileSize].workBitmap);
if (pWorkSurf == NULL)
{
ERROR_OUT(( "Failed to lock work surface"));
DC_QUIT;
}
TRACE_OUT(( "Locked surface"));
//
// Do the Blt to our work bitmap to get the bits at native bpp, and
// using the color table which we sent to the share core.
//
destRectl.top = 0;
destRectl.left = 0;
destRectl.right = cxSubBitmapWidth;
destRectl.bottom = cySubBitmapHeight;
sourcePt = tileOrg;
if (!EngBitBlt(pWorkSurf,
pSourceSurf,
NULL, // mask surface
NULL, // clip object
pMemBltInfo->pXlateObj,
&destRectl,
&sourcePt,
NULL, // mask origin
NULL, // brush
NULL, // brush origin
0xcccc)) // SRCCPY
{
ERROR_OUT(( "Failed to Blt to work bitmap"));
DC_QUIT;
}
TRACE_OUT(( "Completed BitBlt"));
//
// The Blt succeeded, so pass the bits to the share core by copying
// them into the correct shunt buffer.
//
// bytesUsed is set to the number of bytes required for
// cySubBitmapHeight number of full scanlines in the shunt buffer tile
// (NOT the number of bytes available in the tile, or the number of
// bytes of data which was actually Blted)
//
// major/minorCacheInfo are set to details from the source surface.
// hdev does not change on consecutive Blts from the same surface, but
// iUniq may.
//
pDestSurf = pMemBltInfo->pDest;
pDestDev = (LPOSI_PDEV)pDestSurf->dhpdev;
pTileData->bytesUsed = BYTES_IN_BITMAP(g_sbcWorkInfo[tileSize].tileWidth,
cySubBitmapHeight,
pDestDev->cBitsPerPel);
pTileData->srcX = (TSHR_UINT16)sourcePt.x;
pTileData->srcY = (TSHR_UINT16)sourcePt.y;
pTileData->width = cxSubBitmapWidth;
pTileData->height = cySubBitmapHeight;
pTileData->tilingWidth = tileWidth;
pTileData->tilingHeight = tileHeight;
pTileData->majorCacheInfo = (UINT)pSourceSurf->hsurf;
pTileData->minorCacheInfo = (UINT)pSourceSurf->iUniq;
pTileData->majorPalette = (UINT)pMemBltInfo->pXlateObj;
pTileData->minorPalette = (UINT)(pMemBltInfo->pXlateObj != NULL ?
pMemBltInfo->pXlateObj->iUniq : 0);
//
// If the source surface has the BMF_DONTCACHE flag set then it is a
// DIB Section. This means that an app can change the bits in the
// surface without calling GDI, and hence without the iUniq value being
// updated.
//
// We rely on iUniq changing for the fast path to work, so we must
// exclude these bitmaps from the fast path. Do this by resetting the
// majorCacheInfo field (we use this rather than minorCacheInfo because
// we can't tell what an invalid iUniq value is).
//
if ( (pSourceSurf->iType == STYPE_BITMAP) &&
((pSourceSurf->fjBitmap & BMF_DONTCACHE) != 0) )
{
TRACE_OUT(( "Source hsurf %#.8lx has BMF_DONTCACHE set",
pTileData->majorCacheInfo));
pTileData->majorCacheInfo = SBC_DONT_FASTPATH;
}
//
// Note that this only works correctly because we create our work
// bitmaps to be "top down" rather than the default of "bottom up".
// i.e. the data for the top scanline is first in memory, so we can
// start copying from the start of the bit data. Bottom up would mean
// working out an offset into the work bitmap to start copying from.
//
memcpy(pTileData->bitData, pWorkSurf->pvBits, pTileData->bytesUsed);
//
// We've done the copy. Reset the work bitmap bits for next time we
// use this work bitmap - this helps with compression later on.
//
memset(pWorkSurf->pvBits, 0, pWorkSurf->cjBits);
//
// Fill in the required info in the Mem(3)Blt order.
//
if (type == ORD_MEMBLT_TYPE)
{
pMemBltOrder->cacheId = pTileData->tileId;
}
else
{
pMem3BltOrder->cacheId = pTileData->tileId;
}
//
// We've filled in all the data in the shunt buffer entry, so mark it
// as in use so that the share core can access it.
//
pTileData->inUse = TRUE;
//
// Must have completed successfully to get to here
//
TRACE_OUT(( "Queued tile (%d, %d), %d x %d, tile %d x %d, Id %hx",
sourcePt.x,
sourcePt.y,
cxSubBitmapWidth,
cySubBitmapHeight,
g_sbcWorkInfo[tileSize].tileWidth,
g_sbcWorkInfo[tileSize].tileHeight,
pTileData->tileId));
rc = TRUE;
DC_EXIT_POINT:
//
// Unlock the work surface (if required)
//
if (pWorkSurf != NULL)
{
EngUnlockSurface(pWorkSurf);
TRACE_OUT(( "Unlocked surface"));
}
DebugExitDWORD(SBC_DDCacheMemScreenBlt, rc);
return(rc);
//
// If the data flow rate is high enough then we don't bother with
// any bitmap caching. This allows the host to run at its maximum
// speed at all times, which gives us the maximum amount of spoiling
// and responsiveness.
//
if (!usrCacheBitmaps)
{
DC_QUIT;
}
//
// Bitmap caching is only supported for 4bpp and 8bpp protocols. If we
// switch the sending bpp during a share it does not matter because we
// are controlling the remote bitmap caches.
//
if ((usrSendingbpp != 4) &&
(usrSendingbpp != 8))
{
DC_QUIT;
}
//
// Extract the src DC handle from the Order Header.
//
hdcSrc = pOrder->OrderHeader.memBltInfo.hdcSrc;
//
// If the mapping mode of the src DC is anything other that MM_TEXT
// (the default) then we don't cache the bitmap.
// We are aiming to cache icons and buttons and these will normally
// be drawn using MM_TEXT mapping mode. Therefore if the mode is
// anything other than MM_TEXT we can assume something more complex
// is going on and we probably don't want to cache it anyway.
//
if ((hdcSrc != NULL) && (GetMapMode(hdcSrc) != MM_TEXT))
{
TRACE()"Didn't cache blt using complex mapping mode"));
DC_QUIT;
}
//
// Extract the src bitmap handle from the Order.
//
type = ((LPMEMBLT_ORDER)&pOrder->abOrderData)->type;
if (type == LOWORD(ORD_MEMBLT))
{
hBitmap = (HBITMAP)((LPMEMBLT_ORDER)&pOrder->abOrderData)->hBitmap;
}
else
{
hBitmap = (HBITMAP)((LPMEM3BLT_ORDER)&pOrder->abOrderData)->hBitmap;
}
TRACE_DBG()"hBitmap %x", hBitmap));
//
// If this is a thrasher then don't cache it
//
if (!SBCBitmapCacheAllowed(hBitmap))
{
TRACE()"Its a thrasher!"));
DC_QUIT;
}
//
// Fetch the bitmap details. If the bitmap is 1bpp and the colors are
// not default then we don't cache it (all bitmaps are cached in
// glorious technicolor!)
//
if (hBitmap == NULL)
{
bmpWidth = (TSHR_INT16)pOrder->OrderHeader.memBltInfo.lpbmi->
bmiHeader.biWidth;
bmpHeight = (TSHR_INT)pOrder->OrderHeader.memBltInfo.lpbmi->
bmiHeader.biHeight;
srcBpp = pOrder->OrderHeader.memBltInfo.lpbmi->bmiHeader.biPlanes *
pOrder->OrderHeader.memBltInfo.lpbmi->bmiHeader.biBitCount;
}
else
{
if (GetObject(hBitmap, sizeof(BITMAP), &bmpDetails))
{
srcBpp = bmpDetails.bmBitsPixel * bmpDetails.bmPlanes;
bmpWidth = bmpDetails.bmWidth;
bmpHeight = bmpDetails.bmHeight;
}
else
{
TRACE_ERR()"Failed to get bmp details (%x)", (TSHR_UINT16)hBitmap));
DC_QUIT;
}
}
if ( (srcBpp == 1) &&
( (GetBkColor(hdcDst) != DEFAULT_BG_COLOR) ||
(GetTextColor(hdcDst) != DEFAULT_FG_COLOR) ||
(type == LOWORD(ORD_MEM3BLT))) )
{
TRACE()"Didn't cache mono bitmap with non-default colors"));
DC_QUIT;
}
//
// Set up pointers to the source coordinates in the order.
//
if ( type == LOWORD(ORD_MEMBLT) )
{
pXSrc = &((LPMEMBLT_ORDER)&(pOrder->abOrderData))->nXSrc;
pYSrc = &((LPMEMBLT_ORDER)&(pOrder->abOrderData))->nYSrc;
}
else
{
pXSrc = &((LPMEM3BLT_ORDER)&(pOrder->abOrderData))->nXSrc;
pYSrc = &((LPMEM3BLT_ORDER)&(pOrder->abOrderData))->nYSrc;
}
//
// Calculate the tile size for this blit
//
if (!SBC_QueryBitmapTileSize(bmpWidth,
bmpHeight,
&tileWidth,
&tileHeight))
{
TRACE()"Cache does not support tiling"));
DC_QUIT;
}
//
// Calculate the tile origin and size of remaining bitmap. Origin is
// rounded down to the nearest tile. Actual size of bitmap to cache
// may be smaller than tile size if the tile runs off the right/bottom
// of the bitmap
//
tileOrg.x = *pXSrc - (*pXSrc % tileWidth);
tileOrg.y = *pYSrc - (*pYSrc % tileHeight);
//
// Actual size of bitmap to cache may be smaller than tile size if the
// tile runs off the right/bottom of the bitmap. To see why this
// calculation is correct, realize that (bmpWidth - tileOrg.x) is the
// remaining width of the bitmap after the start of this tile.
//
cxSubBitmapWidth = MIN((TSHR_INT16)tileWidth, bmpWidth - tileOrg.x);
cySubBitmapHeight = MIN((TSHR_INT16)tileHeight, bmpHeight - tileOrg.y);
//
// Add the bitmap to the cache.
//
// If the sub-bitmap is already in the cache then this function will
// locate it and return the cache index.
//
// If the sub-bitmap is not in the cache, this function will cache
// it, adding the sub-bitmap data to the order queue.
//
if (!SBCCacheSubBitmap(&iCache,
hBitmap,
hdcSrc,
hdcDst,
tileOrg.x,
tileOrg.y,
bmpWidth,
bmpHeight,
cxSubBitmapWidth,
cySubBitmapHeight,
srcBpp,
&iCacheEntry,
&iColorTable,
pOrder->OrderHeader.memBltInfo.pBits,
pOrder->OrderHeader.memBltInfo.lpbmi,
pOrder->OrderHeader.memBltInfo.fuColorUse,
pOrder->OrderHeader.memBltInfo.hPalDest))
{
//
// The sub-bitmap could not be cached - return FALSE.
// The caller will add the destination of the blt into the SDA and
// discard the order.
//
TRACE()"Failed to cache bitmap %04x", hBitmap));
DC_QUIT;
}
//
// Set up the source co-ordinates. For R1 protocols, the x-coordinate
// includes the offset which is required to get the right cell within
// the receive bitmap cache. For R2, we set up the cache entry in a
// separate field.
//
if (!sbcMultiPoint)
{
*pXSrc = (iCacheEntry * sbcBmpCaches[iCache].cCellSize) +
*pXSrc % tileWidth;
}
else
{
*pXSrc = *pXSrc % tileWidth;
}
*pYSrc = *pYSrc % tileHeight;
//
// The sub-bitmap and color table are in the cache. Store a cache
// handle and color handle (which the receiver will turn back into an
// HBITMAP). Also store the cache index for R2 protocols (see above).
//
if (type == LOWORD(ORD_MEMBLT))
{
((LPMEMBLT_ORDER)&pOrder->abOrderData)->hBitmap =
MEMBLT_COMBINEHANDLES(iColorTable,iCache);
if (sbcMultiPoint)
{
((LPMEMBLT_R2_ORDER)&pOrder->abOrderData)->type =
LOWORD(ORD_MEMBLT_R2);
((LPMEMBLT_R2_ORDER)&pOrder->abOrderData)->cacheIndex =
iCacheEntry;
}
TRACE()"MEMBLT color %d bitmap %d:%d",iColorTable,iCache,iCacheEntry));
}
else
{
((LPMEM3BLT_ORDER)&pOrder->abOrderData)->hBitmap =
MEMBLT_COMBINEHANDLES(iColorTable,iCache);
if (sbcMultiPoint)
{
((LPMEM3BLT_R2_ORDER)&pOrder->abOrderData)->type =
LOWORD(ORD_MEM3BLT_R2);
((LPMEM3BLT_R2_ORDER)&pOrder->abOrderData)->cacheIndex =
iCacheEntry;
}
TRACE()"MEM3BLT color %d bitmap %d:%d",iColorTable,iCache,iCacheEntry));
}
TRACE_DBG()"iCacheEntry=%u, tileWidth=%hu, xSrc=%hd, ySrc=%hd",
iCacheEntry, tileWidth, *pXSrc, *pYSrc));
rc = TRUE;
DC_EXIT(rc);
}
//
//
// SBC_DDQueryBitmapTileSize - see sbc.h
//
//
BOOL SBC_DDQueryBitmapTileSize
(
UINT bmpWidth,
UINT bmpHeight,
LPUINT pTileWidth,
LPUINT pTileHeight
)
{
BOOL rc = FALSE;
UINT i;
UINT maxSide;
DebugEntry(SBC_DDQueryBitmapTileSize);
//
// The tile cell sizes are a local only decision, with the proviso that
// the largest uncompressed tile must fit into the largest cache slot.
// What this means is that for R1.1 we must define cell dimensions that
// have a good fit in the square cache cells. For R2.0 we can just
// select tile sizes that seem appropriate. Taking widths that are not
// a multiple of 16 is wasteful. The height should generally be less
// than the width, simply on the grounds that bitmaps tend to be wider
// than they are high.
//
if (g_sbcCacheInfo[ID_LARGE_BMP_CACHE].cCellSize <
(g_sbcWorkInfo[SBC_SMALL_TILE_INDEX].tileWidth *
g_sbcWorkInfo[SBC_SMALL_TILE_INDEX].tileHeight))
{
ERROR_OUT(( "No space for any cells"));
DC_QUIT;
}
rc = TRUE;
//
// If large cell size is adequate then allow 64*63 cells for
// wide bitmaps
//
if (g_sbcCacheInfo[ID_LARGE_BMP_CACHE].cCellSize >=
(MP_LARGE_TILE_WIDTH * MP_LARGE_TILE_HEIGHT))
{
if ((bmpWidth > MP_SMALL_TILE_WIDTH) ||
(bmpHeight > MP_SMALL_TILE_HEIGHT))
{
*pTileWidth = MP_LARGE_TILE_WIDTH;
*pTileHeight = MP_LARGE_TILE_HEIGHT;
DC_QUIT;
}
}
//
// Otherwise we just use 32*31 cells
//
*pTileWidth = MP_SMALL_TILE_WIDTH;
*pTileHeight = MP_SMALL_TILE_HEIGHT;
DC_EXIT_POINT:
DebugExitBOOL(SBC_DDQueryBitmapTileSize, rc);
return(rc);
}
//
//
// SBC_DDSyncUpdatesNow() - see sbc.h
//
//
void SBC_DDSyncUpdatesNow(void)
{
LPSBC_TILE_DATA pTileData;
UINT i;
UINT j;
DebugEntry(SBC_DDSyncUpdatesNow);
TRACE_OUT(( "Marking all shunt buffer entries as not in use"));
//
// We have to mark all entries in the shunt buffers as being free.
//
for (i = 0 ; i < SBC_NUM_TILE_SIZES; i++)
{
for (j = 0 ; j < g_sbcWorkInfo[i].pShuntBuffer->numEntries; j++)
{
pTileData = SBCTilePtrFromIndex(g_sbcWorkInfo[i].pShuntBuffer, j);
pTileData->inUse = FALSE;
}
//
// Reset the MRU counter for this shunt buffer
//
g_sbcWorkInfo[i].mruIndex = 0;
}
//
// If we are a palette device (i.e. we are running at 8 bpp or less),
// set the paletteChanged flag so we will send up a color table before
// our next Mem(3)Blt. We do this because the color table order for
// the current device palette may have been discarded during the OA
// sync.
//
g_sbcPaletteChanged = (g_osiScreenBPP <= 8);
DebugExitVOID(SBC_DDSyncUpdatesNow);
}
//
//
// SBC_DDOrderSpoiltNotification() - see sbc.h
//
//
void SBC_DDOrderSpoiltNotification(LPINT_ORDER pOrder)
{
LPMEMBLT_ORDER pMemBltOrder = (LPMEMBLT_ORDER)&(pOrder->abOrderData);
LPMEM3BLT_ORDER pMem3BltOrder = (LPMEM3BLT_ORDER)pMemBltOrder;
UINT tileId;
LPSBC_TILE_DATA pTileData;
UINT tileType;
UINT i;
DebugEntry(SBC_DDOrderSpoiltNotification);
//
// pOrder has been removed from the order heap before being processed.
// We have to free up the entry which it references in one of the shunt
// buffers. First get the tile Id.
//
if (pMemBltOrder->type = ORD_MEMBLT_TYPE)
{
tileId = pMemBltOrder->cacheId;
}
else
{
tileId = pMem3BltOrder->cacheId;
}
TRACE_OUT(( "Order referencing tile %hx has been spoiled", tileId));
//
// Find out which of the shunt buffers the entry should be in based on
// the tileId
//
tileType = SBC_TILE_TYPE(tileId);
//
// We implement the shunt buffers as circular FIFO queues, so we will
// start looking from the last order which we marked as being in use,
// and work BACKWARDS. This is because, in general, the entries after
// the last one we accessed will not be in use (unless the whole shunt
// buffer is in use).
//
// So, get the index of the last tile we accessed.
//
i = g_sbcWorkInfo[tileType].mruIndex;
//
// Loop through the circular buffer until we get a match, or have
// circled back to the beginning.
//
// Note that this has been coded as a "do while" loop, rather than just
// a "while" loop so that we don't miss mruIndex. mruIndex is set up
// to point to the NEXT entry to be used, rather than the last entry to
// be used, so decrementing i before doing any work first time round
// the loop is actually what we want to do.
//
do
{
//
// On to the next tile
//
i = (i == 0)
? g_sbcWorkInfo[tileType].pShuntBuffer->numEntries - 1
: i - 1;
pTileData = SBCTilePtrFromIndex(g_sbcWorkInfo[tileType].pShuntBuffer, i);
if (pTileData->inUse && (pTileData->tileId == tileId))
{
//
// We've got a match, so mark the tile as being free.
//
// We don't want to update the shunt buffer mruIndex - this
// should remain indicating the next tile to be used when
// adding an entry to the shunt buffer.
//
TRACE_OUT(( "Marked tile Id %hx at index %d as free",
tileId,
i));
pTileData->inUse = FALSE;
break;
}
}
while (i != g_sbcWorkInfo[tileType].mruIndex);
DebugExitVOID(SBC_DDOrderSpoiltNotification);
}
//
//
// SBC_DDMaybeQueueColorTable() - see sbc.h
//
//
BOOL SBC_DDMaybeQueueColorTable(void)
{
BOOL queuedOK = FALSE;
int orderSize;
LPINT_ORDER pOrder;
LPINT_COLORTABLE_ORDER_1BPP pColorTableOrder;
UINT numColors;
UINT i;
DebugEntry(SBC_DDMaybeQueueColorTable);
//
// If we're running at > 8 bpp, then we don't have a palette, so just
// quit out.
//
if (g_osiScreenBPP > 8)
{
queuedOK = TRUE;
DC_QUIT;
}
//
// Check the boolean in our PDEV to see if the palette has changed
// since the last time we sent a color table order. Note that if we
// have a non palette device, the boolean will never be set.
//
if (!g_sbcPaletteChanged)
{
queuedOK = TRUE;
DC_QUIT;
}
//
// The palette has changed, so allocate order memory to queue a color
// table order. The order size depends on the bpp of our device. Note
// that the allocation can fail if the order buffer is full.
//
switch (g_osiScreenBPP)
{
case 1:
{
orderSize = sizeof(INT_COLORTABLE_ORDER_1BPP);
}
break;
case 4:
{
orderSize = sizeof(INT_COLORTABLE_ORDER_4BPP);
}
break;
case 8:
{
orderSize = sizeof(INT_COLORTABLE_ORDER_8BPP);
}
break;
default:
{
ERROR_OUT(("Invalid bpp (%d) for palette device", g_osiScreenBPP));
DC_QUIT;
}
break;
}
pOrder = OA_DDAllocOrderMem(orderSize, 0);
if (pOrder == NULL)
{
TRACE_OUT(( "Failed to allocate %d bytes for order", orderSize));
DC_QUIT;
}
TRACE_OUT(( "Allocate %d bytes for color table order", orderSize));
//
// We've successfully allocated the order, so fill in the details. We
// mark the order as internal so that the Update Packager will spot it
// up in the share core and prevent it being sent over the wire.
//
pOrder->OrderHeader.Common.fOrderFlags = OF_INTERNAL;
pColorTableOrder = (LPINT_COLORTABLE_ORDER_1BPP)&(pOrder->abOrderData);
pColorTableOrder->header.type = INTORD_COLORTABLE_TYPE;
pColorTableOrder->header.bpp = g_osiScreenBPP;
//
// Get the current system palette and save it.
//
numColors = COLORS_FOR_BPP(g_osiScreenBPP);
for (i = 0 ; i < numColors; i++)
{
pColorTableOrder->colorData[i].rgbRed = ppDev->pPal[i].peRed;
pColorTableOrder->colorData[i].rgbGreen = ppDev->pPal[i].peGreen;
pColorTableOrder->colorData[i].rgbBlue = ppDev->pPal[i].peBlue;
}
//
// Add the order
//
OA_DDAddOrder(pOrder, NULL);
TRACE_OUT(( "Added internal color table order, size %d", orderSize));
//
// Reset the flag which indicates that the palette needs to be sent
//
g_sbcPaletteChanged = FALSE;
//
// Must be OK to get to here
//
queuedOK = TRUE;
DC_EXIT_POINT:
DebugExitBOOL(SBC_DDMaybeQueueColorTable, queuedOK);
return(queuedOK);
}
//
// Name: SBCDDCreateShuntBuffers
//
// Purpose: Allocate memory for, and initialize the two shunt buffers
// used to pass data from the driver to the share core.
//
// Returns: TRUE if the buffers were allocated OK, FALSE otherwise.
//
// Operation: If this function succeeds, the following global variables
// are initialized.
//
// g_sbcWorkInfo[x].pShuntBuffer
// g_sbcWorkInfo[x].mruIndex
// g_sbcNextTileId
//
// If the function fails, some of these variables may be
// initialized.
//
BOOL SBCDDCreateShuntBuffers(void)
{
int i;
UINT memPerTile[SBC_NUM_TILE_SIZES];
UINT numEntries[SBC_NUM_TILE_SIZES];
DWORD memRequired;
DWORD minRequired;
HGLOBAL hBuffer;
LPBYTE pBuffer;
BOOL rc;
DebugEntry(SBCDDCreateShuntBuffers);
rc = FALSE;
//
// We should already have a pointer to the shared memory we can use for
// our shunt buffers, and the number of bytes available. What we have
// to do is to partition this shared memory into SBC_NUM_TILE_SIZE
// shunt buffers. i.e. one shunt buffer per tile size.
//
//
// <--- buffer 0 ---><------------------ buffer 1 -------------------->
//
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ
//<2F> <20> : : : : <20> <20> : : : : <20>
//<2F> <20> : : : : <20> <20> tile : tile : tile : tile : tile <20>
//<2F> <20> : : : : <20> <20> : : : : <20>
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//^ ^ ^
//<2F> <20> <20>
//<2F> <20><><EFBFBD><EFBFBD> header[0] <20><><EFBFBD><EFBFBD> header[1]
//<2F>
//<2F><><EFBFBD> psbcSharedMemory
//
//
// We try to use the number of entries given in the pEntries array, but
// if we do not have enough shared memory for this, we reduce the
// number of entries in each shunt buffer, preserving the ratio between
// the number of entries in each of the shunt buffers.
//
for (i = 0; i < SBC_NUM_TILE_SIZES ; i++)
{
numEntries[i] = SBC_TILE_ENTRIES;
//
// Calculate how much memory we need per tile, and for the whole
// shunt buffer.
//
memPerTile[i] = SBC_BYTES_PER_TILE(g_sbcWorkInfo[i].tileWidth,
g_sbcWorkInfo[i].tileHeight,
g_osiScreenBPP);
memRequired = SBCShuntBufferSize(memPerTile[i], numEntries[i]);
if (i == SBC_SMALL_TILE_INDEX)
minRequired = SBCShuntBufferSize(memPerTile[i], SBC_SMALL_TILE_MIN_ENTRIES);
else
minRequired = SBCShuntBufferSize(memPerTile[i], SBC_LARGE_TILE_MIN_ENTRIES);
TRACE_OUT(( "[%d]: Requested %d entries, %ld bytes, %ld bytes min",
i, numEntries[i], memRequired, minRequired));
//
// If memRequired or minRequired are greater than 64K, bail out.
//
if (memRequired > 0x10000)
{
if (minRequired > 0x10000)
{
WARNING_OUT(("Not enough memory for SBC"));
DC_QUIT;
}
//
// We have enough shared memory for the minimum # of entries,
// but not enough for the default. Figure out how many will fit.
// in 64K. We do this in a tricky way to avoid DWORD divides
//
// Basically, the result is
// (64K - fixed shunt buffer goop) / memPerTile
//
numEntries[i] = (0xFFFF -
(sizeof(SBC_SHUNT_BUFFER) - sizeof(SBC_TILE_DATA)) + 1) /
memPerTile[i];
}
//
// Try to allocate memory block.
//
hBuffer = GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT | GMEM_SHARE,
SBCShuntBufferSize(memPerTile[i], numEntries[i]));
if (!hBuffer)
{
WARNING_OUT(("Not enough memory for SBC"));
DC_QUIT;
}
g_sbcWorkInfo[i].pShuntBuffer = (LPSBC_SHUNT_BUFFER)MAKELP(hBuffer, 0);
}
//
// There are currently only two tile sizes and therefore two shunt
// buffers. If we run out of memory on the second one, yeah, we'll
// exit this function with one 64K block still allocated for the small
// tile size cache. It will get freed when SBC_DDTerm() is called.
//
// If this happens, freeing the block isn't going to make much of a
// difference, Windows is almost on its knees anyway. So no point in
// getting fancy and freeing it now.
//
//
// OK, we're home free.
//
for (i = 0; i < SBC_NUM_TILE_SIZES ; i++)
{
ASSERT(g_sbcWorkInfo[i].pShuntBuffer);
g_sbcWorkInfo[i].pShuntBuffer->numEntries = numEntries[i];
g_sbcWorkInfo[i].pShuntBuffer->numBytes = memPerTile[i]
- sizeof(SBC_TILE_DATA);
g_sbcWorkInfo[i].pShuntBuffer->structureSize = memPerTile[i];
//
// Fill in the mruIndex for this shunt buffer
//
g_sbcWorkInfo[i].mruIndex = 0;
}
//
// Initialize the global variables associated with the shunt buffers
//
g_sbcNextTileId = 0;
rc = TRUE;
DC_EXIT_POINT:
DebugExitBOOL(SBCDDCreateShuntBuffers, rc);
return(rc);
}
//
// Name: SBCDDGetNextFreeTile
//
// Purpose: Return the next free tile of the correct size from one of the
// shunt buffers.
//
// Returns: TRUE if a tile is returned, FALSE otherwise
//
// Params: IN workTileSize - The tile size. One of
// SBC_SMALL_TILE
// SBC_LARGE_TILE
// OUT ppTileData - A pointer to the tile.
//
// Operation: The tileId field of the tile is filled in on return from
// this function.
//
//*PROC-********************************************************************
BOOL SBCDDGetNextFreeTile(int tileSize, LPSBC_TILE_DATA FAR * ppTileData)
{
BOOL foundFreeTile = FALSE;
LPSBC_TILE_DATA pTileData;
DebugEntry(SBCDDGetNextFreeTile);
ASSERT(tileSize < SBC_NUM_TILE_SIZES);
//
// Get a pointer to the next entry to be used in the shunt buffer
// containing tiles of the given size.
//
pTileData = SBCTilePtrFromIndex(g_sbcWorkInfo[tileSize].pShuntBuffer,
g_sbcWorkInfo[tileSize].mruIndex);
//
// If the entry is still in use (the share core has not yet processed
// the order which references this tile) we have to quit - the shunt
// buffer is full.
//
if (pTileData->inUse)
{
TRACE_OUT(( "Target entry (%d, %d) is still in use",
tileSize,
g_sbcWorkInfo[tileSize].mruIndex));
DC_QUIT;
}
//
// The entry is not in use - we can re-use it. Fill in the Id field,
// and the pointer to the entry which we return to the caller.
//
// We always set the top bit of the tile Id for large tiles, and clear
// it for small tiles.
//
*ppTileData = pTileData;
pTileData->tileId = g_sbcNextTileId;
if (tileSize == SBC_SMALL_TILE_INDEX)
{
pTileData->tileId &= ~0x8000;
}
else
{
pTileData->tileId |= 0x8000;
}
TRACE_OUT(( "Returning entry (%d, %d), Id %hx",
tileSize,
g_sbcWorkInfo[tileSize].mruIndex,
pTileData->tileId));
//
// Update the index of the next free entry in this shunt buffer, and
// also the Id which we should assign next time. Remember to wrap the
// shunt buffer index to the number of entries in the shunt buffer.
//
g_sbcWorkInfo[tileSize].mruIndex = (g_sbcWorkInfo[tileSize].mruIndex + 1) %
g_sbcWorkInfo[tileSize].pShuntBuffer->numEntries;
g_sbcNextTileId++;
g_sbcNextTileId &= ~0x8000;
//
// Completed successfully !
//
foundFreeTile = TRUE;
DC_EXIT_POINT:
DebugExitBOOL(SBCDDGetNextFreeTile, foundFreeTile);
return(foundFreeTile);
}
//
// Name: SBCDDIsBitmapThrasher
//
// Purpose: Check to see if the given bitmap (surface object) is one
// which would cause cache thrashing.
//
// Returns: TRUE if the bitmap is a thrasher, FALSE otherwise.
//
// Params: IN pSurfObj - Pointer to the bitmap
//
BOOL SBCDDIsBitmapThrasher(HDC hdc)
{
UINT i;
BOOL rc = FALSE;
BOOL bitmapInList = FALSE;
BOOL updateEntry = FALSE;
UINT updateIndex;
UINT nextTickCount;
UINT evictIndex;
UINT evictTickCount;
DebugEntry(SBCDDIsBitmapThrasher);
//
// Here's an overview of how our bitmap cache thrash detection works...
//
// We hold an array of information about the last SBC_NUM_THRASHERS
// bitmaps which we have tried to cache. This information is
// - A value to identify the bitmap. This is the hsurf field from the
// bitmap surface object, and is different for every bitmap.
// - A value to identify the "version" of the bitmap. This is the
// iUniq field from the bitmap surface object, and is updated by GDI
// each time the bitmap is drawn to.
// - A timestamp for the last time which we saw iUniq change for this
// bitmap (or when we added the bitmap to the array).
//
// Each time this function is called, we scan this array looking for an
// entry for the bitmap.
//
// If we find an entry, we check whether the bitmap has changed (has
// the iUniq field changed). If it has not changed, the bitmap is not
// a thrasher. If the bitmap has changed, we check the interval from
// the timestamp value to the current time. If the interval is less
// than the SBC_THRASH_INTERVAL, the bitmap has changed too quickly, so
// it is a thrasher. If the interval is OK, the bitmap is not a
// thrasher. In either case, we update the stored iUniq field and the
// timestamp to record the time / version at which we spotted that the
// bitmap changed.
//
// If we do not find an entry for the bitmap, we add an entry for it.
// If the array is fully populated, we evict the entry with the oldest
// timestamp, and replace it with the new entry.
//
//
// Scan the thrasher list looking for a match
//
for (i=0 ; i < SBC_NUM_THRASHERS ; i++)
{
//
// If we find a match then we are only worried if it has been
// modified since the last time we read it.
//
if (sbcThrashers[i].hsurf == lpdce->hbmp)
{
bitmapInList = TRUE;
if (sbcThrashers[i].iUniq != pSurfObj->iUniq)
{
TRACE_OUT(( "Matching surface %x, index %u,"
"tick count %u has been modified",
pSurfObj->hsurf,
i,
sbcThrashers[i].tickCount));
updateEntry = TRUE;
updateIndex = i;
//
// Now we need to determine if this is a thrasher. It is a
// thrasher if the time we last read it is less than our
// thrash interval. (We only update the time when we read
// a modified bitmap)
//
nextTickCount = SBCDDGetTickCount();
if ((nextTickCount - sbcThrashers[i].tickCount) <
SBC_THRASH_INTERVAL)
{
TRACE_OUT((
"Rejected cache attempt of thrashy bitmap %x",
pSurfObj->hsurf));
rc = TRUE;
}
sbcThrashers[i].tickCount = nextTickCount;
sbcThrashers[i].iUniq = pSurfObj->iUniq;
}
//
// We've found a match - we can break out of the loop
//
break;
}
}
if (!bitmapInList)
{
//
// The bitmap isn't already in the thrasher list, so add it now.
// Find the entry with the smallest (earliest) tick count - we will
// evict this entry from the array to make room for the new entry.
//
evictIndex = 0;
evictTickCount = 0xffffffff;
for (i = 0; i < SBC_NUM_THRASHERS; i++)
{
if (evictTickCount > sbcThrashers[i].tickCount)
{
evictTickCount = sbcThrashers[i].tickCount;
evictIndex = i;
}
}
TRACE_OUT(( "Evicting entry %d, surface %x",
evictIndex,
sbcThrashers[i].hsurf));
nextTickCount = SBCDDGetTickCount();
TRACE_OUT(( "Adding surface %x to thrash list, tick %d",
pSurfObj->hsurf,
nextTickCount));
updateEntry = TRUE;
updateIndex = evictIndex;
}
if (updateEntry)
{
//
// We have to update the entry at index updateIndex. We optimise
// things slightly by always putting the most recent bitmap in
// position 0 of the array, so copy entry 0 to the eviction index,
// and put the new entry in position 0.
//
sbcThrashers[updateIndex] = sbcThrashers[0];
sbcThrashers[0].hsurf = lpdce->hbmp;
sbcThrashers[0].iUniq = pSurfObj->iUniq;
sbcThrashers[0].tickCount = nextTickCount;
}
DebugExitBOOL(SBCDDIsBitmapThrasher, rc);
return(rc);
}
//
// Name: SBCDDGetTickCount
//
// Purpose: Get a system tick count
//
// Returns: The number of centi-seconds since the system was started.
// This number will wrap after approximately 497 days!
//
// Params: None
//
DWORD SBCDDGetTickCount(void)
{
DWORD tickCount;
DebugEntry(SBCDDGetTickCount);
tickCount = GetTickCount() / 10;
DebugExitDWORD(SBCDDGetTickCount, tickCount);
return(tickCount);
}
#endif // #if 0
#if 0
//
// SBC_BitmapHasChanged(..)
//
// See asbcapi.h for description.
//
DCVOID DCAPI SBC_BitmapHasChanged(HBITMAP hChangedBitmap)
{
TSHR_UINT nextIndex;
TSHR_INT nextTickCount;
TSHR_INT tickDelta;
TSHR_INT tickWork;
UINT i;
TRACE_FN("SBC_BitmapHasChanged");
//
// We maintain a list of bitmaps that are the target for a drawing
// operation and we prevent these bitmaps from being cached unless
// the update frequency is below a target value.
//
// All we need to do at this stage is to make sure that the bitmap
// handle is in the thrash list and is marked as modified since the
// last read. That means that the next read will be "productive"
// and so we will check/update the timer at that stage. If the
// "productive" read occurs within a certain interval from the last
// read then this bitmap has become a thrasher.
//
if (sbcThrashers[0].hBitmap == hChangedBitmap)
{
TRACE()"Repeat bitmap %x modified",(UINT)hChangedBitmap));
sbcThrashers[0].modified = TRUE;
}
else
{
nextIndex = 0;
nextTickCount = (int)(CO_GET_TICK_COUNT()/32);
tickDelta = abs(nextTickCount - sbcThrashers[0].tickCount);
for (i=1; i<SBC_NUM_THRASHERS; i++)
{
if (sbcThrashers[i].hBitmap == hChangedBitmap)
{
sbcThrashers[i].modified = TRUE;
break;
}
tickWork = abs(nextTickCount - sbcThrashers[i].tickCount);
if (tickWork > tickDelta)
{
tickDelta = tickWork;
nextIndex = i;
}
}
//
// If not found in the list then add to the list. Always add to
// the top of the list so we find repeated bitmaps as the first
// entry
//
if (i == SBC_NUM_THRASHERS)
{
TRACE()"Relegating bitmap %x at list pos %u",
(UINT)sbcThrashers[nextIndex].hBitmap,nextIndex));
if (nextIndex != 0)
{
sbcThrashers[nextIndex].hBitmap = sbcThrashers[0].hBitmap;
sbcThrashers[nextIndex].tickCount = sbcThrashers[0].tickCount;
sbcThrashers[nextIndex].modified = sbcThrashers[0].modified;
}
sbcThrashers[0].hBitmap = hChangedBitmap;
sbcThrashers[0].tickCount = nextTickCount - BMC_THRASH_INTERVAL;
sbcThrashers[0].modified = TRUE;
TRACE()"Adding bitmap %x to thrash list tick %u",
(TSHR_UINT16)hChangedBitmap, nextTickCount));
}
}
//
// We also maintain a list of "fast path" bitmaps, which is those tiles
// that have not been modified since we cached them and can therefore
// be interpreted from the handle alone. This must be an exhaustive
// search for each bitmap update and so we cannot offord the CPU of
// processing a very long list, but we can afford to cache enough to
// handle most animations. Also it is not worth the CPU to try and
// save individual tiles here. We just evict the complete bitmap.
//
for (i=0; i<SBC_NUM_FASTPATH; i++)
{
if (sbcFastPath[i].hBitmap == hChangedBitmap)
{
TRACE()"Bitmap %x no longer fastpathed",(UINT)hChangedBitmap));
sbcFastPath[i].hBitmap = 0;
}
}
return;
}
//
// SBC_BitmapDeleted()
//
// See asbcapi.h for description.
//
DCVOID DCAPI SBC_BitmapDeleted(HBITMAP hDeletedBitmap)
{
UINT i;
TRACE_FN("SBC_BitmapDeleted");
//
// Remove the bitmap from the thrashy list.
//
for (i=0; i<SBC_NUM_THRASHERS; i++)
{
if (sbcThrashers[i].hBitmap == hDeletedBitmap)
{
TRACE_DBG()"Bitmap %x no longer thrashing",hDeletedBitmap));
sbcThrashers[i].hBitmap = 0;
sbcThrashers[i].tickCount = 0;
break;
}
}
//
// We also maintain a list of "fast path" bitmaps, which is those tiles
// that have not been modified since we cached them and can therefore
// be interpreted from the handle alone. This must be an exhaustive
// search for each bitmap update and so we cannot offord the CPU of
// processing a very long list, but we can afford to cache enough to
// handle most animations. Also it is not worth the CPU to try and
// save individual tiles here. We just evict the complete bitmap.
//
for (i=0; i<SBC_NUM_FASTPATH; i++)
{
if (sbcFastPath[i].hBitmap == hDeletedBitmap)
{
TRACE()"Bitmap %x no longer fastpathed",(UINT)hDeletedBitmap));
sbcFastPath[i].hBitmap = 0;
sbcFastPath[i].tickCount = 0;
}
}
return;
}
//
// SBC_ColorsChanged()
//
// Called whenever the system palette changes (presumably as a result of
// a new logical palette being realized to the screen).
//
//
DCVOID DCAPI SBC_ColorsChanged(DCVOID)
{
TRACE_FN("SBC_ColorsChanged");
//
// Just clear out all the fast path cache because we can no longer
// trust the cached bits to accurately reflect the color table we
// have cached. (Note that this does not mean we will not use the
// bits without resending, merely that we will force a retest of
// the bits with the latest color info selected.
//
TRACE()"Fastpath table reset"));
memset(sbcFastPath, 0, sizeof(sbcFastPath));
}
#endif
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