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Microsoft Windows NT Build 511 (DDK SDK) 11-01-1993
/******************************Module*Header*******************************\
* Module Name: bitblt.c
*
* BitBlt
*
* Copyright (c) 1992 Microsoft Corporation
\**************************************************************************/
#include "driver.h"
#include "bitblt.h"
#include <winperf.h> // include performance API definitions (PERFCTR)
// Global counter block for performance data (PERFCTR)
extern PPERF_COUNTER_BLOCK pCounterBlock;
BOOL bConvertBrush(BRUSHINST *pbri);
VOID vCompiledBlt(PDEVSURF,LONG,LONG,PDEVSURF,LONG,LONG,
LONG,LONG,ULONG,BRUSHINST *,ULONG,ULONG,ULONG *,POINTL *);
/******************************Public*Data*********************************\
* ROP translation table
*
* Translates the usual ternary rop into A-vector notation. Each bit in
* this new notation corresponds to a term in a polynomial translation of
* the rop.
*
* Rop(D,S,P) = a + a D + a S + a P + a DS + a DP + a SP + a DSP
* 0 d s p ds dp sp dsp
*
* History:
* 24-Aug-1990 -by- Donald Sidoroff [donalds]
* Added it as a global table for the VGA driver.
\**************************************************************************/
BYTE gajRop[] =
{
0x00, 0xff, 0xb2, 0x4d, 0xd4, 0x2b, 0x66, 0x99,
0x90, 0x6f, 0x22, 0xdd, 0x44, 0xbb, 0xf6, 0x09,
0xe8, 0x17, 0x5a, 0xa5, 0x3c, 0xc3, 0x8e, 0x71,
0x78, 0x87, 0xca, 0x35, 0xac, 0x53, 0x1e, 0xe1,
0xa0, 0x5f, 0x12, 0xed, 0x74, 0x8b, 0xc6, 0x39,
0x30, 0xcf, 0x82, 0x7d, 0xe4, 0x1b, 0x56, 0xa9,
0x48, 0xb7, 0xfa, 0x05, 0x9c, 0x63, 0x2e, 0xd1,
0xd8, 0x27, 0x6a, 0x95, 0x0c, 0xf3, 0xbe, 0x41,
0xc0, 0x3f, 0x72, 0x8d, 0x14, 0xeb, 0xa6, 0x59,
0x50, 0xaf, 0xe2, 0x1d, 0x84, 0x7b, 0x36, 0xc9,
0x28, 0xd7, 0x9a, 0x65, 0xfc, 0x03, 0x4e, 0xb1,
0xb8, 0x47, 0x0a, 0xf5, 0x6c, 0x93, 0xde, 0x21,
0x60, 0x9f, 0xd2, 0x2d, 0xb4, 0x4b, 0x06, 0xf9,
0xf0, 0x0f, 0x42, 0xbd, 0x24, 0xdb, 0x96, 0x69,
0x88, 0x77, 0x3a, 0xc5, 0x5c, 0xa3, 0xee, 0x11,
0x18, 0xe7, 0xaa, 0x55, 0xcc, 0x33, 0x7e, 0x81,
0x80, 0x7f, 0x32, 0xcd, 0x54, 0xab, 0xe6, 0x19,
0x10, 0xef, 0xa2, 0x5d, 0xc4, 0x3b, 0x76, 0x89,
0x68, 0x97, 0xda, 0x25, 0xbc, 0x43, 0x0e, 0xf1,
0xf8, 0x07, 0x4a, 0xb5, 0x2c, 0xd3, 0x9e, 0x61,
0x20, 0xdf, 0x92, 0x6d, 0xf4, 0x0b, 0x46, 0xb9,
0xb0, 0x4f, 0x02, 0xfd, 0x64, 0x9b, 0xd6, 0x29,
0xc8, 0x37, 0x7a, 0x85, 0x1c, 0xe3, 0xae, 0x51,
0x58, 0xa7, 0xea, 0x15, 0x8c, 0x73, 0x3e, 0xc1,
0x40, 0xbf, 0xf2, 0x0d, 0x94, 0x6b, 0x26, 0xd9,
0xd0, 0x2f, 0x62, 0x9d, 0x04, 0xfb, 0xb6, 0x49,
0xa8, 0x57, 0x1a, 0xe5, 0x7c, 0x83, 0xce, 0x31,
0x38, 0xc7, 0x8a, 0x75, 0xec, 0x13, 0x5e, 0xa1,
0xe0, 0x1f, 0x52, 0xad, 0x34, 0xcb, 0x86, 0x79,
0x70, 0x8f, 0xc2, 0x3d, 0xa4, 0x5b, 0x16, 0xe9,
0x08, 0xf7, 0xba, 0x45, 0xdc, 0x23, 0x6e, 0x91,
0x98, 0x67, 0x2a, 0xd5, 0x4c, 0xb3, 0xfe, 0x01
};
/******************************Public*Data*********************************\
* ROP to mix translation table
*
* Table to translate ternary raster ops to mixes (binary raster ops). Ternary
* raster ops that can't be translated to mixes are translated to 0 (0 is not
* a valid mix).
*
\**************************************************************************/
UCHAR jRop3ToMix[256] = {
R2_BLACK, 0, 0, 0, 0, R2_NOTMERGEPEN, 0, 0,
0, 0, R2_MASKNOTPEN, 0, 0, 0, 0, R2_NOTCOPYPEN,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
R2_MASKPENNOT, 0, 0, 0, 0, R2_NOT, 0, 0,
0, 0, R2_XORPEN, 0, 0, 0, 0, R2_NOTMASKPEN,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
R2_MASKPEN, 0, 0, 0, 0, R2_NOTXORPEN, 0, 0,
0, 0, R2_NOP, 0, 0, 0, 0, R2_MERGENOTPEN,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
R2_COPYPEN, 0, 0, 0, 0, R2_MERGEPENNOT, 0, 0,
0, 0, R2_MERGEPEN, 0, 0, 0, 0, R2_WHITE
};
/******************************Public*Routine******************************\
* VOID DrvBitBlt(pso,pso,pso,pco,pxlo,prcl,pptl,pptl,pdbrush,pptl,rop4)
*
* Bitblt.
*
\**************************************************************************/
BOOL DrvBitBlt
(
SURFOBJ *psoTrg, // Target surface
SURFOBJ *psoSrc, // Source surface
SURFOBJ *psoMask, // Mask
CLIPOBJ *pco, // Clip through this
XLATEOBJ *pxlo, // Color translation
RECTL *prclTrg, // Target offset and extent
POINTL *pptlSrc, // Source offset
POINTL *pptlMask, // Mask offset
BRUSHOBJ *pbo, // Pointer to brush object
POINTL *pptlBrush, // Brush offset
ROP4 rop4 // Raster operation
)
{
BYTE jForeRop; // Foreground rop in A-vector notation
BYTE jBackRop; // Background rop in A-vector notation
BYTE jORedRops; // jForeRop | jBackRop
BRUSHINST bri; // Instance of a brush
BRUSHINST *pbri; // Pointer to a brush instance
DEVSURF dsurfSrc; // For source if a DIB
PDEVSURF pdsurfTrg; // Pointer for target
PDEVSURF pdsurfSrc; // Pointer for source if present
ULONG iSolidColor; // Solid color for solid brushes
BOOL bMore; // Clip continuation flag
ULONG ircl; // Clip enumeration rectangle index
RECT_ENUM bben; // Clip enumerator
ULONG *pulXlate; // Pointer to color xlate vector
BYTE jClipping;
MIX mix; // Mix, when solid fill performed
RECTL rclTemp;
ULONG ulBkColor;
ULONG ulFgColor;
PRECTL prcl;
POINTL ptlTemp;
UCHAR *pucDIB4ToVGAConvTables;
VOID (*pfnPatBlt)(PDEVSURF,ULONG,PRECTL,MIX, BRUSHINST *,PPOINTL);
PDWORD pdwCounter; // Pointer to counter to increment (PERFCTR)
// Increment BitBlt counter (PERFCTR)
pdwCounter = (PDWORD) pCounterBlock;
(*pdwCounter)++;
// Let the engine handle the stuff we can't yet do.
if (psoSrc != (SURFOBJ *) NULL) {
if ((psoSrc->iBitmapFormat != BMF_1BPP) &&
(psoSrc->iBitmapFormat != BMF_4BPP) &&
(psoSrc->iBitmapFormat != BMF_8BPP)) {
return(EngBitBlt(psoTrg,psoSrc,psoMask,
pco,pxlo,prclTrg,pptlSrc,pptlMask,
pbo,pptlBrush,rop4));
} else {
// We only handle SRCCOPY screen-to-screen blts right now
if ((psoSrc->dhsurf == psoTrg->dhsurf) && (rop4 != 0x0000CCCC)) {
return(EngBitBlt(psoTrg,psoSrc,psoMask,
pco,pxlo,prclTrg,pptlSrc,pptlMask,
pbo,pptlBrush,rop4));
}
}
}
if ((rop4 & 0x000000FF) != ((rop4 >> 8) & 0x000000FF)) {
return(EngBitBlt(psoTrg,psoSrc,psoMask,
pco,pxlo,prclTrg,pptlSrc,pptlMask,
pbo,pptlBrush,rop4));
}
// Get the target surface's pointer. The target must always be a device
// surface
pdsurfTrg = (PDEVSURF) psoTrg->dhsurf;
// Set up the clipping type
if (pco == (CLIPOBJ *) NULL) {
// No CLIPOBJ provided, so we don't have to worry about clipping
jClipping = DC_TRIVIAL;
} else {
// Use the CLIPOBJ-provided clipping
jClipping = pco->iDComplexity;
}
// Break the rops with the VGA as the destination surface into two classes,
// those that can call special case static code (currently: vTrgBlt(solid
// fills) and vAlignedSrcCopy (aligned srccopy blts)), and those that must
// call the compiled blt code
if (pdsurfTrg->iFormat == BMF_PHYSDEVICE) {
// Masked cases must be handled differently
if ((rop4 & 0xFF) == ((rop4 >> 8) & 0xFF)) {
// Special case static code for no-mask cases
// Calculate mix from ROP if possible (not possible if it's truly a
// ternary rop or a real rop4, but we can treat all pure binary
// rops as mixes rather than rop4s)
mix = jRop3ToMix[rop4 & 0xFF];
pbri = (BRUSHINST *)NULL;
switch (mix) {
case R2_MASKNOTPEN:
case R2_NOTCOPYPEN:
case R2_XORPEN:
case R2_MASKPEN:
case R2_NOTXORPEN:
case R2_MERGENOTPEN:
case R2_COPYPEN:
case R2_MERGEPEN:
case R2_NOTMERGEPEN:
case R2_MASKPENNOT:
case R2_NOTMASKPEN:
case R2_MERGEPENNOT:
// vTrgBlt can only handle solid color fills
if (pbo->iSolidColor != 0xffffffff)
{
iSolidColor = pbo->iSolidColor;
}
else
{
// TrgBlt can only handle solid brushes, but let's
// see if we can use our special case pattern code.
//
pbri = (BRUSHINST *)pbo->pvRbrush;
if (pbri == (BRUSHINST *)NULL)
{
pbri = (BRUSHINST *)BRUSHOBJ_pvGetRbrush(pbo);
if (pbri == (BRUSHINST *)NULL)
{
return(EngBitBlt(psoTrg, psoSrc, psoMask, pco,
pxlo, prclTrg, pptlSrc, pptlMask, pbo,
pptlBrush, rop4));
}
}
// We currently only do mono patterns.
pfnPatBlt = vMonoPatBlt;
if (pbri->usStyle != BRI_MONO_PATTERN)
pfnPatBlt = vClrPatBlt;
// We only support non-8 wide brushes with R2_COPYPEN
if ((mix != R2_COPYPEN) && (pbri->RealWidth != 8))
break;
}
// Rops that are implicit solid colors
case R2_NOT:
case R2_WHITE:
case R2_BLACK:
// We can do a special-case solid fill
switch(jClipping) {
case DC_TRIVIAL:
// Just fill the rectangle with a solid color
if (pbri == (BRUSHINST *)NULL)
{
vTrgBlt(pdsurfTrg, 1, prclTrg, mix,
iSolidColor);
}
else
{
(*pfnPatBlt)(pdsurfTrg, 1, prclTrg, mix,
pbri, pptlBrush);
}
break;
case DC_RECT:
// Clip the solid fill to the clip rectangle
if (!DrvIntersectRect(&rclTemp, prclTrg,
&pco->rclBounds)) {
return(TRUE);
}
// Fill the clipped rectangle
if (pbri == (BRUSHINST *)NULL)
{
vTrgBlt(pdsurfTrg, 1, &rclTemp, mix,
iSolidColor);
}
else
{
(*pfnPatBlt)(pdsurfTrg, 1, &rclTemp, mix,
pbri, pptlBrush);
}
break;
case DC_COMPLEX:
CLIPOBJ_cEnumStart(pco, FALSE, CT_RECTANGLES,
CD_ANY, ENUM_RECT_LIMIT);
do {
bMore = CLIPOBJ_bEnum(pco,(ULONG) sizeof(bben),
(PVOID) &bben);
for (ircl = 0; ircl < bben.c; ircl++) {
PRECTL prcl = &bben.arcl[ircl];
DrvIntersectRect(prcl,prcl,prclTrg);
if (pbri == (BRUSHINST *)NULL) {
vTrgBlt(pdsurfTrg, 1, prcl, mix,
iSolidColor);
} else {
(*pfnPatBlt)(pdsurfTrg, 1, prcl, mix,
pbri, pptlBrush);
}
}
} while(bMore);
}
case R2_NOP:
return TRUE;
default:
break;
}
// Not a special-case solid fill; see if it's a screen-to-screen
// SRCCOPY blt, another of our special cases
if (rop4 == 0x0000CCCC) {
// SRCCOPY blt
if (psoSrc->dhsurf == psoTrg->dhsurf) {
INT iCopyDir;
PFN_ScreenToScreenBlt pfn_Blt;
// It's a screen-to-screen SRCCOPY; special-case it
// Determine the direction in which the copy must proceed
// Note that although we could detect cases where the source
// and dest don't overlap and handle them top to bottom, all
// copy directions are equally fast, so there's no reason to go
// top to bottom except possibly that it looks better. But it
// also takes time to detect non-overlap, so I'm not doing it
if (pptlSrc->y >= prclTrg->top) {
if (pptlSrc->x >= prclTrg->left) {
iCopyDir = CD_RIGHTDOWN;
} else {
iCopyDir = CD_LEFTDOWN;
}
} else {
if (pptlSrc->x >= prclTrg->left) {
iCopyDir = CD_RIGHTUP;
} else {
iCopyDir = CD_LEFTUP;
}
}
// These values are expected by vAlignedSrcCopy
switch(jClipping) {
case DC_TRIVIAL:
// Just copy the rectangle
if ((((prclTrg->left ^ pptlSrc->x) & 0x07) == 0)) {
vAlignedSrcCopy(pdsurfTrg, prclTrg,
pptlSrc, iCopyDir);
} else {
vNonAlignedSrcCopy(pdsurfTrg, prclTrg,
pptlSrc, iCopyDir);
}
break;
case DC_RECT:
// Clip the solid fill to the clip rectangle
if (!DrvIntersectRect(&rclTemp, prclTrg, &pco->rclBounds))
{
return(TRUE);
}
// Adjust the source point for clipping too
ptlTemp.x = pptlSrc->x + rclTemp.left - prclTrg->left;
ptlTemp.y = pptlSrc->y + rclTemp.top - prclTrg->top;
// Copy the clipped rectangle
if ((((prclTrg->left ^ pptlSrc->x) & 0x07) == 0)) {
vAlignedSrcCopy(pdsurfTrg, &rclTemp, &ptlTemp,
iCopyDir);
} else {
vNonAlignedSrcCopy(pdsurfTrg, &rclTemp, &ptlTemp,
iCopyDir);
}
break;
case DC_COMPLEX:
if ((((prclTrg->left ^ pptlSrc->x) & 0x07) == 0)) {
pfn_Blt = vAlignedSrcCopy;
} else {
pfn_Blt = vNonAlignedSrcCopy;
}
CLIPOBJ_cEnumStart(pco, FALSE, CT_RECTANGLES,
iCopyDir, ENUM_RECT_LIMIT);
do {
bMore = CLIPOBJ_bEnum(pco,(ULONG) sizeof(bben),
(PVOID) &bben);
for (ircl = 0; ircl < bben.c; ircl++) {
PRECTL prcl = &bben.arcl[ircl];
DrvIntersectRect(prcl,prcl,prclTrg);
// Adjust the source point for clipping too
ptlTemp.x = pptlSrc->x + prcl->left -
prclTrg->left;
ptlTemp.y = pptlSrc->y + prcl->top -
prclTrg->top;
pfn_Blt(pdsurfTrg, prcl,
&ptlTemp, iCopyDir);
}
} while(bMore);
break;
}
return TRUE;
} else if ((psoSrc->iType == STYPE_BITMAP) &&
(psoSrc->iBitmapFormat == BMF_4BPP) &&
((pxlo == NULL) || (pxlo->flXlate == XO_TRIVIAL))) {
// Special case DIB4 to VGA copy if no translation
pucDIB4ToVGAConvTables =
((PDEVSURF) psoTrg->dhsurf)->ppdev->
pucDIB4ToVGAConvTables;
// Make just enough of a fake DEVSURF for the source so
// that the DIB to VGA code can work
dsurfSrc.lNextScan = psoSrc->lDelta;
dsurfSrc.pvBitmapStart = psoSrc->pvScan0;
// Clip as needed
if ((pco == NULL) || (pco->iDComplexity == DC_TRIVIAL)) {
// No clipping, just copy the DIB to the VGA
vDIB2VGA((PDEVSURF) psoTrg->dhsurf, &dsurfSrc,
prclTrg, pptlSrc, pucDIB4ToVGAConvTables);
} else if (pco->iDComplexity == DC_RECT) {
// Clip the destination to the clip rectangle; we
// should never get a NULL result
if (DrvIntersectRect(&rclTemp, prclTrg, &pco->rclBounds)) {
// Adjust the source point for clipping too
ptlTemp.x = pptlSrc->x + rclTemp.left - prclTrg->left;
ptlTemp.y = pptlSrc->y + rclTemp.top - prclTrg->top;
// Blt the clipped rectangle
vDIB2VGA((PDEVSURF) psoTrg->dhsurf, &dsurfSrc,
&rclTemp, &ptlTemp, pucDIB4ToVGAConvTables);
}
return(TRUE);
} else { // DC_COMPLEX:
CLIPOBJ_cEnumStart(pco, FALSE, CT_RECTANGLES,
CD_ANY, ENUM_RECT_LIMIT);
do {
bMore = CLIPOBJ_bEnum(pco,(ULONG) sizeof(bben),
(PVOID) &bben);
prcl = bben.arcl;
for (ircl = 0; ircl < bben.c; ircl++, prcl++) {
// Clip the destination to the clip rectangle;
// we should never get a NULL result
DrvIntersectRect(prcl,prcl,prclTrg);
// Adjust the source point for clipping too
ptlTemp.x = pptlSrc->x + prcl->left -
prclTrg->left;
ptlTemp.y = pptlSrc->y + prcl->top -
prclTrg->top;
// Blt the clipped rectangle
vDIB2VGA((PDEVSURF) psoTrg->dhsurf,
&dsurfSrc, prcl, &ptlTemp,
pucDIB4ToVGAConvTables);
}
} while(bMore);
}
return(TRUE);
}
}
}
}
// Couldn't be special cased. Set up to call the old kludged compiling code.
{
LONG xSrc;
LONG ySrc;
RECTL *prcl;
// Translate the rop from old notation into two A-vector rops
jForeRop = gajRop[rop4 & 0xff];
jBackRop = gajRop[(rop4 >> 8) & 0xff];
jORedRops = jForeRop | jBackRop;
// Get the source surface if a source is needed. The source may be any of
// 1) the screen, 2) a device managed bitmap, 3) an engine bitmap
if (jORedRops & AVEC_NEED_SOURCE) {
if (psoSrc->dhsurf == (DHSURF) 0) {
// Source is an engine bitmap
#ifdef FIREWALLS
dsurfSrc.ident = 0x46525354; // "TSRF"
#endif
dsurfSrc.flSurf = DS_DIB; // Supporting a DIB
dsurfSrc.iFormat = (BYTE)psoSrc->iBitmapFormat;
dsurfSrc.sizlSurf = psoSrc->sizlBitmap;
dsurfSrc.lNextScan = psoSrc->lDelta;
dsurfSrc.pvScan0 = psoSrc->pvScan0;
dsurfSrc.pvBitmapStart = psoSrc->pvScan0;
dsurfSrc.pvConv = pdsurfTrg->pvConv;
pdsurfSrc = &dsurfSrc; // Construct source into here
} else {
// Source is a device format bitmap or the device itself
pdsurfSrc = (PDEVSURF) psoSrc->dhsurf;
}
} else {
pdsurfSrc = (PDEVSURF) NULL; // Assume no source
}
// If a brush is required, do what is necessary to get it. We might be
// able to just use the solid color accelerator, we might have to force it
// to be realized (which could fail).
if (jORedRops & AVEC_NEED_PATTERN) {
// See if there is a solid color accelerator for the brush. If so
// we can just pick it up and use it.
if (pbo->iSolidColor != 0xffffffff) {
bri.usStyle = BRI_SOLID;
bri.fjAccel =
(BYTE)((pbo->iSolidColor & COLOR_BITS) | SOLID_BRUSH);
pbri = &bri;
} else {
// If there is no realization of the brush, we must force it
if (pbo->pvRbrush == (PVOID)NULL)
{
pbri = (BRUSHINST *)BRUSHOBJ_pvGetRbrush(pbo);
if (pbri == (BRUSHINST *)NULL)
{
return(EngBitBlt(psoTrg, psoSrc, psoMask, pco, pxlo,
prclTrg, pptlSrc, pptlMask, pbo, pptlBrush,
rop4));
}
}
else
{
pbri = (BRUSHINST *)pbo->pvRbrush;
}
if (!bConvertBrush(pbri)) {
return(EngBitBlt(psoTrg, psoSrc, psoMask, pco, pxlo,
prclTrg, pptlSrc, pptlMask, pbo, pptlBrush, rop4));
}
}
}
// Determine if color translation is required. If so, then get the
// color translation vector. if no source is involved, then no
// xlateobj will have been passed.
if ((jORedRops & AVEC_NEED_SOURCE) &&
(pxlo != NULL) &&
(pxlo->flXlate & XO_TABLE))
{
pulXlate = pxlo->pulXlate;
ulFgColor = pulXlate[0] << 24; // Mono --> color translation
ulBkColor = pulXlate[1] << 24;
}
else
{
pulXlate = (PULONG) NULL; // No xlate vector
}
// Note: blts where VGA memory is both the source and the destination
// should never make it to this point; it's assumed that the VGA is the
// destination and the destination only
// BUGBUG this must be changed when we support DFBs, to make VGAs
// possibly neither source nor destination, and (maybe?) source but DFB
// dest
// Perform blt with specified clipping.
// BUGBUG only top->bottom blts are currently supported
switch(jClipping) {
RECTL rclTemp;
case DC_RECT:
if (!DrvIntersectRect(&rclTemp, prclTrg, &pco->rclBounds)) {
break;
}
// Adjust the source (if any) accordingly
if (jORedRops & AVEC_NEED_SOURCE) {
pptlSrc->x += rclTemp.left - prclTrg->left;
pptlSrc->y += rclTemp.top - prclTrg->top;
}
*prclTrg = rclTemp;
case DC_TRIVIAL:
// Cycle through all banks that the blt dest spans
// If the proper bank for the top scan line of
// the blt dest isn't mapped in, map it in
if ((prclTrg->top < pdsurfTrg->rcl1WindowClip.top) ||
(prclTrg->top >= pdsurfTrg->rcl1WindowClip.bottom)) {
// Map in the bank containing the top line of the blt dest
pdsurfTrg->pfnBankControl(pdsurfTrg,
prclTrg->top,
JustifyTop);
}
// Now draw the part of the rect that's in each bank
for (;;) {
// Clip the blt dest to the bank
DrvIntersectRect(&rclTemp, prclTrg,
&pdsurfTrg->rcl1WindowClip);
// Adjust the source (if any) accordingly
if (jORedRops & AVEC_NEED_SOURCE) {
xSrc = pptlSrc->x + rclTemp.left - prclTrg->left;
ySrc = pptlSrc->y + rclTemp.top - prclTrg->top;
}
vCompiledBlt(pdsurfTrg,
rclTemp.left,
rclTemp.top,
pdsurfSrc,
xSrc,
ySrc,
rclTemp.right - rclTemp.left,
rclTemp.bottom - rclTemp.top,
rop4,
pbri,
ulBkColor,
ulFgColor,
pulXlate,
pptlBrush);
// Done if this bank contains the last line of the blt
if (prclTrg->bottom <=
pdsurfTrg->rcl1WindowClip.bottom) {
break;
}
// Map in the next bank
pdsurfTrg->pfnBankControl(pdsurfTrg,
pdsurfTrg->rcl1WindowClip.bottom,
JustifyTop);
}
break;
case DC_COMPLEX:
CLIPOBJ_cEnumStart(pco, FALSE, CT_RECTANGLES, CD_ANY, ENUM_RECT_LIMIT);
bMore = TRUE;
do {
if (bMore) {
// Enumerate more clip rects
bMore = CLIPOBJ_bEnum(pco,(ULONG) sizeof(bben),
(PVOID) &bben);
}
// Draw the portion of the blt dest that intersects each
// clip rect in turn
for (ircl = 0; ircl < bben.c; ircl++) {
prcl = &bben.arcl[ircl];
// Find the intersection of the target rect and the
// current clip rect, then draw all banks of the
// clipped target rect, if it's not NULL
DrvIntersectRect(prcl, prcl, prclTrg);
// Cycle through all banks that the blt dest spans
// If the proper bank for the top scan line of
// the blt dest isn't mapped in, map it in
if ((prcl->top <
pdsurfTrg->rcl1WindowClip.top) ||
(prcl->top >=
pdsurfTrg->rcl1WindowClip.bottom)) {
// Map in the bank containing the top line of
// the blt dest
pdsurfTrg->pfnBankControl(pdsurfTrg,
prcl->top,
JustifyTop);
}
// Now draw the part of the clipped rect that's in
// each bank
for (;;) {
RECTL rclTemp;
// Clip the blt dest to the bank
DrvIntersectRect(&rclTemp, prcl,
&pdsurfTrg->rcl1WindowClip);
// Adjust the source (if any) accordingly
if (jORedRops & AVEC_NEED_SOURCE) {
xSrc = pptlSrc->x + rclTemp.left -
prclTrg->left;
ySrc = pptlSrc->y + rclTemp.top -
prclTrg->top;
}
vCompiledBlt(pdsurfTrg,
rclTemp.left,
rclTemp.top,
pdsurfSrc,
xSrc,
ySrc,
rclTemp.right - rclTemp.left,
rclTemp.bottom - rclTemp.top,
rop4,
pbri,
ulBkColor,
ulFgColor,
pulXlate,
pptlBrush);
// Done if this bank contains the last line of
// the blt
if (prcl->bottom <=
pdsurfTrg->rcl1WindowClip.bottom) {
break;
}
// Map in the next bank
pdsurfTrg->pfnBankControl(pdsurfTrg,
pdsurfTrg->rcl1WindowClip.bottom,
JustifyTop);
}
}
} while(bMore);
break;
} // switch(jClipping);
}
return TRUE;
}
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