1728 lines
53 KiB
C
1728 lines
53 KiB
C
/******************************Module*Header*******************************\
|
||
* Module Name: heap.c
|
||
*
|
||
* This module contains the routines for a 2-d heap. It is used primarily
|
||
* for allocating space for device-format-bitmaps in off-screen memory.
|
||
*
|
||
* Off-screen bitmaps are a big deal on NT because:
|
||
*
|
||
* 1) It reduces the working set. Any bitmap stored in off-screen
|
||
* memory is a bitmap that isn't taking up space in main memory.
|
||
*
|
||
* 2) There is a speed win by using the accelerator hardware for
|
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* drawing, in place of NT's GDI code. NT's GDI is written entirely
|
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* in 'C++' and perhaps isn't as fast as it could be.
|
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*
|
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* 3) It leads naturally to nifty tricks that can take advantage of
|
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* the hardware, such as MaskBlt support and cheap double buffering
|
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* for OpenGL.
|
||
*
|
||
* The heap algorithm employed herein attempts to solve an unsolvable
|
||
* problem: the problem of keeping arbitrary sized bitmaps as packed as
|
||
* possible in a 2-d space, when the bitmaps can come and go at random.
|
||
*
|
||
* This problem is due entirely to the nature of the hardware for which this
|
||
* driver is written: the hardware treats everything as 2-d quantities. If
|
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* the hardware bitmap pitch could be changed so that the bitmaps could be
|
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* packed linearly in memory, the problem would be infinitely easier (it is
|
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* much easier to track the memory, and the accelerator can be used to re-pack
|
||
* the heap to avoid segmentation).
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*
|
||
* If your hardware can treat bitmaps as one dimensional quantities (as can
|
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* the XGA and ATI), by all means please implement a new off-screen heap.
|
||
*
|
||
* When the heap gets full, old allocations will automatically be punted
|
||
* from off-screen and copied to DIBs, which we'll let GDI draw on.
|
||
*
|
||
* Note that this heap manages reverse-L shape off-screen memory
|
||
* configurations (where the scan pitch is longer than the visible screen,
|
||
* such as happens at 800x600 when the scan length must be a multiple of
|
||
* 1024).
|
||
*
|
||
* NOTE: All heap operations must be done under some sort of synchronization,
|
||
* whether it's controlled by GDI or explicitly by the driver. All
|
||
* the routines in this module assume that they have exclusive access
|
||
* to the heap data structures; multiple threads partying in here at
|
||
* the same time would be a Bad Thing. (By default, GDI does NOT
|
||
* synchronize drawing on device-created bitmaps.)
|
||
*
|
||
* Copyright (c) 1993-1995 Microsoft Corporation
|
||
\**************************************************************************/
|
||
|
||
#include "precomp.h"
|
||
|
||
#define OH_ALLOC_SIZE 4000 // Do all memory allocations in 4k chunks
|
||
#define OH_QUANTUM 4 // The minimum dimension of an allocation
|
||
#define CXCY_SENTINEL 0x7fffffff // The sentinel at the end of the available
|
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// list has this very large 'cxcy' value
|
||
|
||
// This macro results in the available list being maintained with a
|
||
// cx-major, cy-minor sort:
|
||
|
||
#define CXCY(cx, cy) (((cx) << 16) | (cy))
|
||
|
||
/******************************Public*Routine******************************\
|
||
* OH* pohNewNode
|
||
*
|
||
* Allocates a basic memory unit in which we'll pack our data structures.
|
||
*
|
||
* Since we'll have a lot of OH nodes, most of which we will be
|
||
* occasionally traversing, we do our own memory allocation scheme to
|
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* keep them densely packed in memory.
|
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*
|
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* It would be the worst possible thing for the working set to simply
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* call AtiAllocMem(sizeof(OH)) every time we needed a new node. There
|
||
* would be no locality; OH nodes would get scattered throughout memory,
|
||
* and as we traversed the available list for one of our allocations,
|
||
* it would be far more likely that we would hit a hard page fault.
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\**************************************************************************/
|
||
|
||
OH* pohNewNode(
|
||
PDEV* ppdev)
|
||
{
|
||
LONG i;
|
||
LONG cOhs;
|
||
OHALLOC* poha;
|
||
OH* poh;
|
||
|
||
if (ppdev->heap.pohFreeList == NULL)
|
||
{
|
||
// We zero-init to initialize all the OH flags, and to help in
|
||
// debugging (we can afford to do this since we'll be doing this
|
||
// very infrequently):
|
||
|
||
poha = AtiAllocMem(LPTR, FL_ZERO_MEMORY, OH_ALLOC_SIZE);
|
||
if (poha == NULL)
|
||
return(NULL);
|
||
|
||
// Insert this OHALLOC at the begining of the OHALLOC chain:
|
||
|
||
poha->pohaNext = ppdev->heap.pohaChain;
|
||
ppdev->heap.pohaChain = poha;
|
||
|
||
// This has a '+ 1' because OHALLOC includes an extra OH in its
|
||
// structure declaration:
|
||
|
||
cOhs = (OH_ALLOC_SIZE - sizeof(OHALLOC)) / sizeof(OH) + 1;
|
||
|
||
// The big OHALLOC allocation is simply a container for a bunch of
|
||
// OH data structures in an array. The new OH data structures are
|
||
// linked together and added to the OH free list:
|
||
|
||
poh = &poha->aoh[0];
|
||
for (i = cOhs - 1; i != 0; i--)
|
||
{
|
||
poh->pohNext = poh + 1;
|
||
poh = poh + 1;
|
||
}
|
||
|
||
poh->pohNext = NULL;
|
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ppdev->heap.pohFreeList = &poha->aoh[0];
|
||
}
|
||
|
||
poh = ppdev->heap.pohFreeList;
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||
ppdev->heap.pohFreeList = poh->pohNext;
|
||
|
||
return(poh);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
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||
* VOID vOhFreeNode
|
||
*
|
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* Frees our basic data structure allocation unit by adding it to a free
|
||
* list.
|
||
*
|
||
\**************************************************************************/
|
||
|
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VOID vOhFreeNode(
|
||
PDEV* ppdev,
|
||
OH* poh)
|
||
{
|
||
if (poh == NULL)
|
||
return;
|
||
|
||
poh->pohNext = ppdev->heap.pohFreeList;
|
||
ppdev->heap.pohFreeList = poh;
|
||
poh->ohState = -1;
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* VOID vCalculateMaximumNonPermanent
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*
|
||
* Traverses the list of in-use and available rectangles to find the one
|
||
* with the maximal area.
|
||
*
|
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\**************************************************************************/
|
||
|
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VOID vCalculateMaximumNonPermanent(
|
||
PDEV* ppdev)
|
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{
|
||
OH* poh;
|
||
OH* pohSentinel;
|
||
LONG lArea;
|
||
LONG lMaxArea;
|
||
LONG cxMax;
|
||
LONG cyMax;
|
||
LONG i;
|
||
|
||
lMaxArea = 0;
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||
cxMax = 0;
|
||
cyMax = 0;
|
||
|
||
// First time through, loop through the list of free available
|
||
// rectangles:
|
||
|
||
pohSentinel = &ppdev->heap.ohFree;
|
||
|
||
for (i = 2; i != 0; i--)
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{
|
||
for (poh = pohSentinel->pohNext; poh != pohSentinel; poh = poh->pohNext)
|
||
{
|
||
ASSERTDD(poh->ohState != OH_PERMANENT,
|
||
"Permanent node in free or discardable list");
|
||
|
||
// We don't have worry about this multiply overflowing
|
||
// because we are dealing in physical screen coordinates,
|
||
// which will probably never be more than 15 bits:
|
||
|
||
lArea = poh->cx * poh->cy;
|
||
if (lArea > lMaxArea)
|
||
{
|
||
cxMax = poh->cx;
|
||
cyMax = poh->cy;
|
||
lMaxArea = lArea;
|
||
}
|
||
}
|
||
|
||
// Second time through, loop through the list of discardable
|
||
// rectangles:
|
||
|
||
pohSentinel = &ppdev->heap.ohDiscardable;
|
||
}
|
||
|
||
// All that we are interested in is the dimensions of the rectangle
|
||
// that has the largest possible available area (and remember that
|
||
// there might not be any possible available area):
|
||
|
||
ppdev->heap.cxMax = cxMax;
|
||
ppdev->heap.cyMax = cyMax;
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* OH* pohFree
|
||
*
|
||
* Frees an off-screen heap allocation. The free space will be combined
|
||
* with any adjacent free spaces to avoid segmentation of the 2-d heap.
|
||
*
|
||
* Note: A key idea here is that the data structure for the upper-left-
|
||
* most node must be kept at the same physical CPU memory so that
|
||
* adjacency links are kept correctly (when two free spaces are
|
||
* merged, the lower or right node can be freed).
|
||
*
|
||
\**************************************************************************/
|
||
|
||
OH* pohFree(
|
||
PDEV* ppdev,
|
||
OH* poh)
|
||
{
|
||
ULONG cxcy;
|
||
OH* pohBeside;
|
||
OH* pohNext;
|
||
OH* pohPrev;
|
||
OHSTATE oldState;
|
||
|
||
if (poh == NULL)
|
||
return(NULL);
|
||
|
||
DISPDBG((15, "Freeing %li x %li at (%li, %li)",
|
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poh->cx, poh->cy, poh->x, poh->y));
|
||
|
||
#if DEBUG_HEAP
|
||
{
|
||
RECTL rclBitmap;
|
||
RBRUSH_COLOR rbc;
|
||
LONG xOffset;
|
||
LONG yOffset;
|
||
|
||
rclBitmap.left = poh->x;
|
||
rclBitmap.top = poh->y;
|
||
rclBitmap.right = poh->x + poh->cx;
|
||
rclBitmap.bottom = poh->y + poh->cy;
|
||
|
||
xOffset = ppdev->xOffset;
|
||
yOffset = ppdev->yOffset;
|
||
|
||
ppdev->xOffset = 0;
|
||
ppdev->yOffset = 0;
|
||
|
||
ppdev->pfnFillSolid(ppdev, 1, &rclBitmap, LOGICAL_0, rbc,
|
||
NULL);
|
||
|
||
ppdev->xOffset = xOffset;
|
||
ppdev->yOffset = yOffset;
|
||
}
|
||
#endif
|
||
|
||
oldState = poh->ohState;
|
||
if (oldState != OH_DISCARDABLE)
|
||
{
|
||
// We can remove the 'reserved' status unless we are merely
|
||
// deleting a discardable rectangle that was temporarily
|
||
// placed in a reserve rectangle:
|
||
|
||
poh->cxReserved = 0;
|
||
poh->cyReserved = 0;
|
||
}
|
||
|
||
// Update the uniqueness to show that space has been freed, so that
|
||
// we may decide to see if some DIBs can be moved back into off-screen
|
||
// memory:
|
||
|
||
ppdev->iHeapUniq++;
|
||
|
||
MergeLoop:
|
||
|
||
// Try merging with the right sibling:
|
||
|
||
pohBeside = poh->pohRight;
|
||
if ((poh->cxReserved != poh->cx) &&
|
||
(pohBeside->ohState == OH_FREE) &&
|
||
(pohBeside->cy == poh->cy) &&
|
||
(pohBeside->pohUp == poh->pohUp) &&
|
||
(pohBeside->pohDown == poh->pohDown) &&
|
||
(pohBeside->pohRight->pohLeft != pohBeside))
|
||
{
|
||
// Add the right rectangle to ours:
|
||
|
||
poh->cx += pohBeside->cx;
|
||
poh->pohRight = pohBeside->pohRight;
|
||
|
||
// Remove 'pohBeside' from the free list and free it:
|
||
|
||
pohBeside->pohNext->pohPrev = pohBeside->pohPrev;
|
||
pohBeside->pohPrev->pohNext = pohBeside->pohNext;
|
||
|
||
vOhFreeNode(ppdev, pohBeside);
|
||
goto MergeLoop;
|
||
}
|
||
|
||
// Try merging with the lower sibling:
|
||
|
||
pohBeside = poh->pohDown;
|
||
if ((poh->cyReserved != poh->cy) &&
|
||
(pohBeside->ohState == OH_FREE) &&
|
||
(pohBeside->cx == poh->cx) &&
|
||
(pohBeside->pohLeft == poh->pohLeft) &&
|
||
(pohBeside->pohRight == poh->pohRight) &&
|
||
(pohBeside->pohDown->pohUp != pohBeside))
|
||
{
|
||
poh->cy += pohBeside->cy;
|
||
poh->pohDown = pohBeside->pohDown;
|
||
|
||
pohBeside->pohNext->pohPrev = pohBeside->pohPrev;
|
||
pohBeside->pohPrev->pohNext = pohBeside->pohNext;
|
||
|
||
vOhFreeNode(ppdev, pohBeside);
|
||
goto MergeLoop;
|
||
}
|
||
|
||
// Don't do any more merge this rectangle into anything to the
|
||
// top or to the left if it's reserved:
|
||
|
||
if (!poh->cxReserved)
|
||
{
|
||
// Try merging with the left sibling:
|
||
|
||
pohBeside = poh->pohLeft;
|
||
if ((pohBeside->cxReserved != pohBeside->cx) &&
|
||
(pohBeside->ohState == OH_FREE) &&
|
||
(pohBeside->cy == poh->cy) &&
|
||
(pohBeside->pohUp == poh->pohUp) &&
|
||
(pohBeside->pohDown == poh->pohDown) &&
|
||
(pohBeside->pohRight == poh) &&
|
||
(poh->pohRight->pohLeft != poh))
|
||
{
|
||
// We add our rectangle to the one to the left:
|
||
|
||
pohBeside->cx += poh->cx;
|
||
pohBeside->pohRight = poh->pohRight;
|
||
|
||
// Remove 'poh' from whatever list it was in (if we were
|
||
// asked to free a 'permanent' node, it will have been in
|
||
// the permanent list) and free it:
|
||
|
||
poh->pohNext->pohPrev = poh->pohPrev;
|
||
poh->pohPrev->pohNext = poh->pohNext;
|
||
|
||
vOhFreeNode(ppdev, poh);
|
||
|
||
poh = pohBeside;
|
||
goto MergeLoop;
|
||
}
|
||
|
||
// Try merging with the upper sibling:
|
||
|
||
pohBeside = poh->pohUp;
|
||
if ((pohBeside->cyReserved != pohBeside->cy) &&
|
||
(pohBeside->ohState == OH_FREE) &&
|
||
(pohBeside->cx == poh->cx) &&
|
||
(pohBeside->pohLeft == poh->pohLeft) &&
|
||
(pohBeside->pohRight == poh->pohRight) &&
|
||
(pohBeside->pohDown == poh) &&
|
||
(poh->pohDown->pohUp != poh))
|
||
{
|
||
pohBeside->cy += poh->cy;
|
||
pohBeside->pohDown = poh->pohDown;
|
||
|
||
poh->pohNext->pohPrev = poh->pohPrev;
|
||
poh->pohPrev->pohNext = poh->pohNext;
|
||
|
||
vOhFreeNode(ppdev, poh);
|
||
|
||
poh = pohBeside;
|
||
goto MergeLoop;
|
||
}
|
||
}
|
||
|
||
// Remove this node from whatever list it's in:
|
||
|
||
poh->pohNext->pohPrev = poh->pohPrev;
|
||
poh->pohPrev->pohNext = poh->pohNext;
|
||
|
||
cxcy = CXCY(poh->cx, poh->cy);
|
||
|
||
// Insert the node, in order, into the free list:
|
||
|
||
pohNext = ppdev->heap.ohFree.pohNext;
|
||
while (pohNext->cxcy < cxcy)
|
||
{
|
||
pohNext = pohNext->pohNext;
|
||
}
|
||
pohPrev = pohNext->pohPrev;
|
||
|
||
pohPrev->pohNext = poh;
|
||
pohNext->pohPrev = poh;
|
||
poh->pohPrev = pohPrev;
|
||
poh->pohNext = pohNext;
|
||
poh->cxcy = cxcy;
|
||
poh->ohState = OH_FREE;
|
||
|
||
if (oldState == OH_PERMANENT)
|
||
{
|
||
// Removing the permanent entry means that we may be able to
|
||
// enlarge the maximum possible rectangle we can allow:
|
||
|
||
vCalculateMaximumNonPermanent(ppdev);
|
||
}
|
||
|
||
// Return the node pointer for the new and improved available rectangle:
|
||
|
||
return(poh);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* BOOL bDiscardEverythingInRectangle
|
||
*
|
||
* Throws out of the heap any discardable bitmaps that intersect with the
|
||
* specified rectangle.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
BOOL bDiscardEverythingInRectangle(
|
||
PDEV* ppdev,
|
||
LONG x,
|
||
LONG y,
|
||
LONG cx,
|
||
LONG cy)
|
||
{
|
||
BOOL bRet;
|
||
OH* poh;
|
||
OH* pohNext;
|
||
|
||
bRet = TRUE; // Assume success
|
||
|
||
poh = ppdev->heap.ohDiscardable.pohNext;
|
||
while (poh != &ppdev->heap.ohDiscardable)
|
||
{
|
||
ASSERTDD(poh->ohState == OH_DISCARDABLE,
|
||
"Non-discardable node in discardable list");
|
||
|
||
pohNext = poh->pohNext;
|
||
|
||
if ((poh->x < x + cx) &&
|
||
(poh->y < y + cy) &&
|
||
(poh->x + poh->cx > x) &&
|
||
(poh->y + poh->cy > y))
|
||
{
|
||
// The two rectangles intersect. Give the boot to the
|
||
// discardable bitmap:
|
||
|
||
if (!pohMoveOffscreenDfbToDib(ppdev, poh))
|
||
bRet = FALSE;
|
||
}
|
||
|
||
poh = pohNext;
|
||
}
|
||
|
||
return(bRet);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* BOOL bFreeRightAndBottomSpace
|
||
*
|
||
* Given a free off-screen rectangle, allocates the upper-left part of
|
||
* the rectangle to hold the allocation request, and puts the two rectangles
|
||
* comprising the unused right and bottom portions on the free list.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
BOOL bFreeRightAndBottomSpace(
|
||
PDEV* ppdev,
|
||
OH* pohThis,
|
||
LONG cxThis,
|
||
LONG cyThis,
|
||
BOOL bQuantum) // Set if inifitely small allocations should be
|
||
// allowed
|
||
{
|
||
ULONG cxcy; // Temporary versions
|
||
OH* pohNext;
|
||
OH* pohPrev;
|
||
LONG cxRem;
|
||
LONG cyRem;
|
||
OH* pohBelow;
|
||
LONG cxBelow;
|
||
LONG cyBelow;
|
||
OH* pohBeside;
|
||
LONG cxBeside;
|
||
LONG cyBeside;
|
||
LONG cQuantum;
|
||
|
||
// We're going to use the upper-left corner of our given rectangle,
|
||
// and divide the unused remainder into two rectangles which will
|
||
// go on the free list.
|
||
|
||
// Compute the width of the unused rectangle to the right, and the
|
||
// height of the unused rectangle below:
|
||
|
||
cyRem = pohThis->cy - cyThis;
|
||
cxRem = pohThis->cx - cxThis;
|
||
|
||
// Given finite area, we wish to find the two rectangles that are
|
||
// most square -- i.e., the arrangement that gives two rectangles
|
||
// with the least perimiter:
|
||
|
||
cyBelow = cyRem;
|
||
cxBeside = cxRem;
|
||
|
||
if (cxRem <= cyRem)
|
||
{
|
||
cxBelow = cxThis + cxRem;
|
||
cyBeside = cyThis;
|
||
}
|
||
else
|
||
{
|
||
cxBelow = cxThis;
|
||
cyBeside = cyThis + cyRem;
|
||
}
|
||
|
||
// If 'bQuantum' is set, we only make new available rectangles of
|
||
// the unused right and bottom portions if they're greater in
|
||
// dimension than OH_QUANTUM (it hardly makes sense to do the
|
||
// book-work to keep around a 2-pixel wide available space, for
|
||
// example):
|
||
|
||
cQuantum = (bQuantum) ? 1 : OH_QUANTUM;
|
||
|
||
pohBeside = NULL;
|
||
if (cxBeside >= cQuantum)
|
||
{
|
||
pohBeside = pohNewNode(ppdev);
|
||
if (pohBeside == NULL)
|
||
return(FALSE);
|
||
}
|
||
|
||
pohBelow = NULL;
|
||
if (cyBelow >= cQuantum)
|
||
{
|
||
pohBelow = pohNewNode(ppdev);
|
||
if (pohBelow == NULL)
|
||
{
|
||
vOhFreeNode(ppdev, pohBeside);
|
||
return(FALSE);
|
||
}
|
||
|
||
// Insert this rectangle into the available list (which is
|
||
// sorted on ascending cxcy):
|
||
|
||
cxcy = CXCY(cxBelow, cyBelow);
|
||
pohNext = ppdev->heap.ohFree.pohNext;
|
||
while (pohNext->cxcy < cxcy)
|
||
{
|
||
pohNext = pohNext->pohNext;
|
||
}
|
||
pohPrev = pohNext->pohPrev;
|
||
|
||
pohPrev->pohNext = pohBelow;
|
||
pohNext->pohPrev = pohBelow;
|
||
pohBelow->pohPrev = pohPrev;
|
||
pohBelow->pohNext = pohNext;
|
||
|
||
// Now update the adjacency information:
|
||
|
||
pohBelow->pohLeft = pohThis->pohLeft;
|
||
pohBelow->pohUp = pohThis;
|
||
pohBelow->pohRight = pohThis->pohRight;
|
||
pohBelow->pohDown = pohThis->pohDown;
|
||
|
||
// Update the rest of the new node information:
|
||
|
||
pohBelow->cxReserved = 0;
|
||
pohBelow->cyReserved = 0;
|
||
pohBelow->cxcy = cxcy;
|
||
pohBelow->ohState = OH_FREE;
|
||
pohBelow->x = pohThis->x;
|
||
pohBelow->y = pohThis->y + cyThis;
|
||
pohBelow->cx = cxBelow;
|
||
pohBelow->cy = cyBelow;
|
||
|
||
// Modify the current node to reflect the changes we've made:
|
||
|
||
pohThis->cy = cyThis;
|
||
}
|
||
|
||
if (cxBeside >= cQuantum)
|
||
{
|
||
// Insert this rectangle into the available list (which is
|
||
// sorted on ascending cxcy):
|
||
|
||
cxcy = CXCY(cxBeside, cyBeside);
|
||
pohNext = ppdev->heap.ohFree.pohNext;
|
||
while (pohNext->cxcy < cxcy)
|
||
{
|
||
pohNext = pohNext->pohNext;
|
||
}
|
||
pohPrev = pohNext->pohPrev;
|
||
|
||
pohPrev->pohNext = pohBeside;
|
||
pohNext->pohPrev = pohBeside;
|
||
pohBeside->pohPrev = pohPrev;
|
||
pohBeside->pohNext = pohNext;
|
||
|
||
// Now update the adjacency information:
|
||
|
||
pohBeside->pohUp = pohThis->pohUp;
|
||
pohBeside->pohLeft = pohThis;
|
||
pohBeside->pohDown = pohThis->pohDown;
|
||
pohBeside->pohRight = pohThis->pohRight;
|
||
|
||
// Update the rest of the new node information:
|
||
|
||
pohBeside->cxReserved = 0;
|
||
pohBeside->cyReserved = 0;
|
||
pohBeside->cxcy = cxcy;
|
||
pohBeside->ohState = OH_FREE;
|
||
pohBeside->x = pohThis->x + cxThis;
|
||
pohBeside->y = pohThis->y;
|
||
pohBeside->cx = cxBeside;
|
||
pohBeside->cy = cyBeside;
|
||
|
||
// Modify the current node to reflect the changes we've made:
|
||
|
||
pohThis->cx = cxThis;
|
||
}
|
||
|
||
if (pohBelow != NULL)
|
||
{
|
||
pohThis->pohDown = pohBelow;
|
||
if ((pohBeside != NULL) && (cyBeside == pohThis->cy))
|
||
pohBeside->pohDown = pohBelow;
|
||
}
|
||
if (pohBeside != NULL)
|
||
{
|
||
pohThis->pohRight = pohBeside;
|
||
if ((pohBelow != NULL) && (cxBelow == pohThis->cx))
|
||
pohBelow->pohRight = pohBeside;
|
||
}
|
||
|
||
pohThis->cxcy = CXCY(pohThis->cx, pohThis->cy);
|
||
|
||
return(TRUE);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* OH* pohMakeRoomAtLocation
|
||
*
|
||
* Attempts to allocate a rectangle at a specific position.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
OH* pohMakeRoomAtLocation(
|
||
PDEV* ppdev,
|
||
POINTL* pptl, // Requested position for the rectangle
|
||
LONG cxThis, // Width of rectangle to be allocated
|
||
LONG cyThis, // Height of rectangle to be allocated
|
||
FLONG floh) // Allocation flags
|
||
{
|
||
OH* poh;
|
||
OH* pohTop;
|
||
OH* pohLeft;
|
||
LONG cxLeft;
|
||
LONG cyTop;
|
||
|
||
if (!(floh & FLOH_ONLY_IF_ROOM))
|
||
{
|
||
// First off, discard any bitmaps that overlap the requested
|
||
// rectangle, assuming we're allowed to:
|
||
|
||
if (!bDiscardEverythingInRectangle(ppdev, pptl->x, pptl->y, cxThis, cyThis))
|
||
return(NULL);
|
||
}
|
||
|
||
// Now see if there is a free rectangle that entirely contains the
|
||
// requested rectangle.
|
||
|
||
for (poh = ppdev->heap.ohFree.pohNext;
|
||
poh != &ppdev->heap.ohFree;
|
||
poh = poh->pohNext)
|
||
{
|
||
ASSERTDD(poh->ohState == OH_FREE, "Non-free node in free list");
|
||
|
||
// See if the current free rectangle completely contains the
|
||
// requested rectangle:
|
||
|
||
if ((poh->x <= pptl->x) &&
|
||
(poh->y <= pptl->y) &&
|
||
(poh->x + poh->cx >= pptl->x + cxThis) &&
|
||
(poh->y + poh->cy >= pptl->y + cyThis))
|
||
{
|
||
// We can't reserve this rectangle, or make it permanent, if it's
|
||
// already been reserved:
|
||
|
||
if ((!poh->cxReserved) ||
|
||
((floh & (FLOH_RESERVE | FLOH_MAKE_PERMANENT)) == 0))
|
||
{
|
||
// The 'poh' rectangle entirely contains the requested
|
||
// rectangle. We may have a situation like this, where
|
||
// the smaller rectangle is the requested rectangle, and
|
||
// the larger rectangle is the available rectangle:
|
||
//
|
||
// +-------------------+
|
||
// | |
|
||
// | +---------+ |
|
||
// | |Requested| |
|
||
// | | | |
|
||
// | +---------+ |
|
||
// | |
|
||
// +-------------------+
|
||
//
|
||
// We want to make the space to the left and to the top of
|
||
// the requested rectangle available to the heap. Our
|
||
// free-space routine only knows how to free space to the
|
||
// right and bottom of an allocation, though. So we will
|
||
// temporarily allocate temporary rectangles to subdivide
|
||
// our rectangle like the following:
|
||
//
|
||
// +-------------------+
|
||
// |Top |
|
||
// +----+--------------+
|
||
// |Left|Free |
|
||
// | | |
|
||
// | | |
|
||
// | | |
|
||
// +----+--------------+
|
||
//
|
||
// Then, in the resulting 'Free' space, we will allocate the
|
||
// upper-left corner for our requested rectangle, after which
|
||
// we will go back and free the 'Top' and 'Left' temporary
|
||
// rectangles.
|
||
|
||
pohTop = NULL;
|
||
pohLeft = NULL;
|
||
cxLeft = pptl->x - poh->x;
|
||
cyTop = pptl->y - poh->y;
|
||
|
||
if (cyTop > 0)
|
||
{
|
||
if (!bFreeRightAndBottomSpace(ppdev, poh, poh->cx, cyTop,
|
||
TRUE))
|
||
{
|
||
return(NULL);
|
||
}
|
||
|
||
pohTop = poh;
|
||
poh = pohTop->pohDown;
|
||
}
|
||
|
||
if (cxLeft > 0)
|
||
{
|
||
if (!bFreeRightAndBottomSpace(ppdev, poh, cxLeft, poh->cy,
|
||
TRUE))
|
||
{
|
||
pohFree(ppdev, pohTop);
|
||
return(NULL);
|
||
}
|
||
|
||
pohLeft = poh;
|
||
poh = pohLeft->pohRight;
|
||
}
|
||
|
||
ASSERTDD((poh->x == pptl->x) &&
|
||
(poh->y == pptl->y) &&
|
||
(poh->x + poh->cx >= poh->x + cxThis) &&
|
||
(poh->y + poh->cy >= poh->y + cyThis),
|
||
"poh must properly fit requested rectangle");
|
||
|
||
// Finally, we can subdivide to get our requested rectangle:
|
||
|
||
if (!bFreeRightAndBottomSpace(ppdev, poh, cxThis, cyThis, FALSE))
|
||
poh = NULL; // Fail this call
|
||
|
||
// Free our temporary rectangles, if there are any:
|
||
|
||
pohFree(ppdev, pohTop);
|
||
pohFree(ppdev, pohLeft);
|
||
|
||
return(poh);
|
||
}
|
||
}
|
||
}
|
||
|
||
// There was no free rectangle that completely contains the requested
|
||
// rectangle:
|
||
|
||
return(NULL);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* OH* pohMakeRoomAnywhere
|
||
*
|
||
* Allocates space for an off-screen rectangle. It will attempt to find
|
||
* the smallest available free rectangle, and will allocate the block out
|
||
* of its upper-left corner. The remaining two rectangles will be placed
|
||
* on the available free space list.
|
||
*
|
||
* If the rectangle would have been large enough to fit into off-screen
|
||
* memory, but there is not enough available free space, we will boot
|
||
* bitmaps out of off-screen and into DIBs until there is enough room.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
OH* pohMakeRoomAnywhere(
|
||
PDEV* ppdev,
|
||
LONG cxThis, // Width of rectangle to be allocated
|
||
LONG cyThis, // Height of rectangle to be allocated
|
||
FLONG floh) // May have FLOH_ONLY_IF_ROOM set
|
||
{
|
||
ULONG cxcyThis; // Width and height search key
|
||
OH* pohThis; // Points to found available rectangle we'll use
|
||
|
||
ASSERTDD((cxThis > 0) && (cyThis > 0), "Illegal allocation size");
|
||
|
||
// Increase the width to get the proper alignment (thus ensuring that all
|
||
// allocations will be properly aligned):
|
||
|
||
cxThis = (cxThis + (HEAP_X_ALIGNMENT - 1)) & ~(HEAP_X_ALIGNMENT - 1);
|
||
|
||
// We can't succeed if the requested rectangle is larger than the
|
||
// largest possible available rectangle:
|
||
|
||
if ((cxThis > ppdev->heap.cxMax) || (cyThis > ppdev->heap.cyMax))
|
||
return(NULL);
|
||
|
||
// Find the first available rectangle the same size or larger than
|
||
// the requested one:
|
||
|
||
cxcyThis = CXCY(cxThis, cyThis);
|
||
pohThis = ppdev->heap.ohFree.pohNext;
|
||
while (pohThis->cxcy < cxcyThis)
|
||
{
|
||
ASSERTDD(pohThis->ohState == OH_FREE, "Non-free node in free list");
|
||
|
||
pohThis = pohThis->pohNext;
|
||
}
|
||
|
||
while (pohThis->cy < cyThis)
|
||
{
|
||
ASSERTDD(pohThis->ohState == OH_FREE, "Non-free node in free list");
|
||
|
||
pohThis = pohThis->pohNext;
|
||
}
|
||
|
||
ASSERTDD(pohThis->ohState == OH_FREE, "Non-free node in free list");
|
||
|
||
if (pohThis->cxcy == CXCY_SENTINEL)
|
||
{
|
||
// There was no space large enough...
|
||
|
||
if (floh & FLOH_ONLY_IF_ROOM)
|
||
return(NULL);
|
||
|
||
DISPDBG((15, "> Making room for %li x %li allocation...", cxThis, cyThis));
|
||
|
||
// We couldn't find an available rectangle that was big enough
|
||
// to fit our request. So throw things out of the heap until we
|
||
// have room, oldest allocations first:
|
||
|
||
do {
|
||
pohThis = ppdev->heap.ohDiscardable.pohPrev; // Least-recently created
|
||
|
||
ASSERTDD(pohThis != &ppdev->heap.ohDiscardable,
|
||
"Ran out of discardable entries -- Max not set correctly");
|
||
ASSERTDD(pohThis->ohState == OH_DISCARDABLE,
|
||
"Non-discardable node in discardable list");
|
||
|
||
// We can safely exit here if we have to:
|
||
|
||
pohThis = pohMoveOffscreenDfbToDib(ppdev, pohThis);
|
||
if (pohThis == NULL)
|
||
return(NULL);
|
||
|
||
} while ((pohThis->cx < cxThis) || (pohThis->cy < cyThis));
|
||
}
|
||
|
||
if ((pohThis->cxReserved) && (floh & (FLOH_RESERVE | FLOH_MAKE_PERMANENT)))
|
||
{
|
||
// We can't reserve this rectangle, or make it permanent, if it's
|
||
// already been reserved. So throw absolutely everything out and
|
||
// search the free list.
|
||
//
|
||
// NOTE: This is extremely painful! A better approach would be to
|
||
// keep separate 'cxMax' and 'cyMax' variables kept for free
|
||
// rectangles that are not reserved (cxMax and cyMax
|
||
// currently include reserved free rectangles).
|
||
|
||
if (!bDiscardEverythingInRectangle(ppdev, 0, 0,
|
||
ppdev->cxMemory, ppdev->cyMemory))
|
||
{
|
||
return(NULL);
|
||
}
|
||
|
||
pohThis = &ppdev->heap.ohFree;
|
||
do {
|
||
pohThis = pohThis->pohNext;
|
||
|
||
if (pohThis == &ppdev->heap.ohFree)
|
||
return(NULL);
|
||
|
||
} while ((pohThis->cxReserved) ||
|
||
(pohThis->cx < cxThis) ||
|
||
(pohThis->cy < cyThis));
|
||
}
|
||
|
||
if (!bFreeRightAndBottomSpace(ppdev, pohThis, cxThis, cyThis, FALSE))
|
||
return(NULL);
|
||
|
||
return(pohThis);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* OH* pohAllocate
|
||
*
|
||
* Allocates a rectangle in off-screen memory.
|
||
*
|
||
* Types:
|
||
*
|
||
* FLOH_RESERVE
|
||
*
|
||
* Reserves an off-screen rectangle. The space may still be used by
|
||
* discardable bitmaps until the rectangle is committed via 'bOhCommit'.
|
||
*
|
||
* FLOH_MAKE_PERMANENT
|
||
*
|
||
* Allocates an off-screen rectangle that can never be booted
|
||
* of the heap. It's the caller's responsibility to manage
|
||
* the rectangle, which includes what to do with the memory in
|
||
* DrvAssertMode when the display is changed to full-screen
|
||
* mode.
|
||
*
|
||
* Default
|
||
*
|
||
* Allocates a 'discardable' off-screen rectangle for a DFB that may
|
||
* be kicked out of off-screen if the space is needed.
|
||
*
|
||
* Options:
|
||
*
|
||
* FLOH_ONLY_IF_ROOM
|
||
*
|
||
* Allocates an off-screen rectangle only if there is free space
|
||
* available -- i.e., no discardable rectangles will be moved out of
|
||
* off-screen to make room.
|
||
*
|
||
* Default
|
||
*
|
||
* May move discardable rectangles out of off-screen to make room.
|
||
*
|
||
* Arguments:
|
||
*
|
||
* pptl
|
||
*
|
||
* If NULL, the rectangle will be allocated anywhere in un-used offscreen
|
||
* memory.
|
||
*
|
||
* If non-NULL, is a requested position for the rectangle.
|
||
*
|
||
* NOTE: The heap will quickly fragment if arbitrary positions are
|
||
* requested. This position option works best if there is only
|
||
* one specific rectangle ever requested, or if the allocations
|
||
* are always wider than they are high.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
OH* pohAllocate(
|
||
PDEV* ppdev,
|
||
POINTL* pptl, // Optional requested position of rectangle
|
||
LONG cxThis, // Width of rectangle to be allocated
|
||
LONG cyThis, // Height of rectangle to be allocated
|
||
FLOH floh) // Allocation flags
|
||
{
|
||
OH* pohThis; // Points to found available rectangle we'll use
|
||
OH* pohRoot; // Point to root of list where we'll insert node
|
||
ULONG cxcy;
|
||
OH* pohNext;
|
||
OH* pohPrev;
|
||
|
||
ASSERTDD((floh & (FLOH_RESERVE | FLOH_MAKE_PERMANENT))
|
||
!= (FLOH_RESERVE | FLOH_MAKE_PERMANENT),
|
||
"Illegal flags -- can't set both FLOH_RESERVE and FLOH_MAKE_PERMANENT");
|
||
|
||
if (pptl == NULL)
|
||
{
|
||
pohThis = pohMakeRoomAnywhere(ppdev, cxThis, cyThis, floh);
|
||
if (pohThis == NULL)
|
||
DISPDBG((15, "Can't allocate %li x %li with flags %li",
|
||
cxThis, cyThis, floh));
|
||
}
|
||
else
|
||
{
|
||
pohThis = pohMakeRoomAtLocation(ppdev, pptl, cxThis, cyThis, floh);
|
||
if (pohThis == NULL)
|
||
DISPDBG((15, "Can't allocate %li x %li at %li, %li with flags %li",
|
||
cxThis, cyThis, pptl->x, pptl->y, floh));
|
||
}
|
||
|
||
if (pohThis == NULL)
|
||
return(NULL);
|
||
|
||
// Calculate the effective start address for this bitmap in off-
|
||
// screen memory:
|
||
|
||
pohThis->pvScan0 = ppdev->pjScreen + (pohThis->y * ppdev->lDelta)
|
||
+ (pohThis->x * ppdev->cjPelSize);
|
||
|
||
// The caller is responsible for setting this field:
|
||
|
||
pohThis->pdsurf = NULL;
|
||
|
||
// Our 'reserve' logic expects the node to have 'free' status:
|
||
|
||
ASSERTDD(pohThis->ohState == OH_FREE, "Node not free after making room");
|
||
ASSERTDD(((floh & (FLOH_RESERVE | FLOH_MAKE_PERMANENT)) == 0) ||
|
||
(pohThis->cxReserved == 0),
|
||
"Can't reserve a rectangle that's already reserved");
|
||
|
||
if (floh & FLOH_RESERVE)
|
||
{
|
||
// A non-zero value for 'cxReserved' means it's reserved:
|
||
|
||
pohThis->cxReserved = pohThis->cx;
|
||
pohThis->cyReserved = pohThis->cy;
|
||
|
||
// Remove this node from its place in the free list:
|
||
|
||
pohThis->pohPrev->pohNext = pohThis->pohNext;
|
||
pohThis->pohNext->pohPrev = pohThis->pohPrev;
|
||
|
||
// Now insert the node, in order, back into the free list:
|
||
|
||
cxcy = pohThis->cxcy;
|
||
|
||
pohNext = ppdev->heap.ohFree.pohNext;
|
||
while (pohNext->cxcy < cxcy)
|
||
{
|
||
pohNext = pohNext->pohNext;
|
||
}
|
||
pohPrev = pohNext->pohPrev;
|
||
|
||
pohPrev->pohNext = pohThis;
|
||
pohNext->pohPrev = pohThis;
|
||
pohThis->pohPrev = pohPrev;
|
||
pohThis->pohNext = pohNext;
|
||
}
|
||
else
|
||
{
|
||
// Remove this node from the free list:
|
||
|
||
pohThis->pohPrev->pohNext = pohThis->pohNext;
|
||
pohThis->pohNext->pohPrev = pohThis->pohPrev;
|
||
|
||
if (floh & FLOH_MAKE_PERMANENT)
|
||
{
|
||
// Change status of node and insert into permanent list:
|
||
|
||
pohThis->ohState = OH_PERMANENT;
|
||
pohRoot = &ppdev->heap.ohPermanent;
|
||
|
||
// Calculate the new maximum size rectangle available
|
||
// for allocation:
|
||
|
||
vCalculateMaximumNonPermanent(ppdev);
|
||
}
|
||
else
|
||
{
|
||
// Change status of node and insert into discardable list:
|
||
|
||
pohThis->ohState = OH_DISCARDABLE;
|
||
pohRoot = &ppdev->heap.ohDiscardable;
|
||
}
|
||
|
||
// Now insert the node at the head of the appropriate list:
|
||
|
||
pohThis->pohNext = pohRoot->pohNext;
|
||
pohThis->pohPrev = pohRoot;
|
||
|
||
pohRoot->pohNext->pohPrev = pohThis;
|
||
pohRoot->pohNext = pohThis;
|
||
}
|
||
|
||
DISPDBG((15, " Allocated (%li x %li) at (%li, %li) with flags %li",
|
||
cxThis, cyThis, pohThis->x, pohThis->y, floh));
|
||
|
||
return(pohThis);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* BOOL bOhCommit
|
||
*
|
||
* If 'bCommit' is TRUE, converts a 'reserved' allocation to 'permanent,'
|
||
* moving from off-screen memory any discardable allocations that may have
|
||
* been using the space.
|
||
*
|
||
* If 'bCommit' is FALSE, converts a 'permanent' allocation to 'reserved,'
|
||
* allowing the space to be used by discardable allocations.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
BOOL bOhCommit(
|
||
PDEV* ppdev,
|
||
OH* poh,
|
||
BOOL bCommit)
|
||
{
|
||
BOOL bRet;
|
||
ULONG cxcy;
|
||
OH* pohRoot;
|
||
OH* pohNext;
|
||
OH* pohPrev;
|
||
|
||
bRet = FALSE; // Assume failure
|
||
|
||
if (poh == NULL)
|
||
return(bRet);
|
||
|
||
if ((bCommit) && (poh->cxReserved))
|
||
{
|
||
if (bDiscardEverythingInRectangle(ppdev, poh->x, poh->y,
|
||
poh->cxReserved, poh->cyReserved))
|
||
{
|
||
DISPDBG((15, "Commited %li x %li at (%li, %li)",
|
||
poh->cx, poh->cy, poh->x, poh->y));
|
||
|
||
poh->ohState = OH_PERMANENT;
|
||
|
||
// Remove this node from the free list:
|
||
|
||
poh->pohPrev->pohNext = poh->pohNext;
|
||
poh->pohNext->pohPrev = poh->pohPrev;
|
||
|
||
// Now insert the node at the head of the permanent list:
|
||
|
||
pohRoot = &ppdev->heap.ohPermanent;
|
||
|
||
poh->pohNext = pohRoot->pohNext;
|
||
poh->pohPrev = pohRoot;
|
||
|
||
pohRoot->pohNext->pohPrev = poh;
|
||
pohRoot->pohNext = poh;
|
||
|
||
bRet = TRUE;
|
||
}
|
||
}
|
||
else if ((!bCommit) && (poh->ohState == OH_PERMANENT))
|
||
{
|
||
DISPDBG((15, "Decommited %li x %li at (%li, %li)",
|
||
poh->cx, poh->cy, poh->x, poh->y));
|
||
|
||
poh->ohState = OH_FREE;
|
||
poh->cxReserved = poh->cx;
|
||
poh->cyReserved = poh->cy;
|
||
|
||
// Remove this node from the permanent list:
|
||
|
||
poh->pohPrev->pohNext = poh->pohNext;
|
||
poh->pohNext->pohPrev = poh->pohPrev;
|
||
|
||
// Now insert the node, in order, into the free list:
|
||
|
||
cxcy = poh->cxcy;
|
||
|
||
pohNext = ppdev->heap.ohFree.pohNext;
|
||
while (pohNext->cxcy < cxcy)
|
||
{
|
||
pohNext = pohNext->pohNext;
|
||
}
|
||
pohPrev = pohNext->pohPrev;
|
||
|
||
pohPrev->pohNext = poh;
|
||
pohNext->pohPrev = poh;
|
||
poh->pohPrev = pohPrev;
|
||
poh->pohNext = pohNext;
|
||
|
||
bRet = TRUE;
|
||
}
|
||
|
||
// Recalculate the biggest rectangle available for allocation:
|
||
|
||
vCalculateMaximumNonPermanent(ppdev);
|
||
|
||
return(bRet);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* BOOL bMoveDibToOffscreenDfbIfRoom
|
||
*
|
||
* Converts the DIB DFB to an off-screen DFB, if there's room for it in
|
||
* off-screen memory.
|
||
*
|
||
* Returns: FALSE if there wasn't room, TRUE if successfully moved.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
BOOL bMoveDibToOffscreenDfbIfRoom(
|
||
PDEV* ppdev,
|
||
DSURF* pdsurf)
|
||
{
|
||
OH* poh;
|
||
SURFOBJ* pso;
|
||
RECTL rclDst;
|
||
POINTL ptlSrc;
|
||
HSURF hsurf;
|
||
|
||
ASSERTDD(pdsurf->dt == DT_DIB,
|
||
"Can't move a bitmap off-screen when it's already off-screen");
|
||
|
||
// If we're in full-screen mode, we can't move anything to off-screen
|
||
// memory:
|
||
|
||
if (!ppdev->bEnabled)
|
||
return(FALSE);
|
||
|
||
poh = pohAllocate(ppdev, NULL, pdsurf->sizl.cx, pdsurf->sizl.cy,
|
||
FLOH_ONLY_IF_ROOM);
|
||
if (poh == NULL)
|
||
{
|
||
// There wasn't any free room.
|
||
|
||
return(FALSE);
|
||
}
|
||
|
||
// 'pdsurf->sizl' is the actual bitmap dimension, not 'poh->cx' or
|
||
// 'poh->cy'.
|
||
|
||
rclDst.left = poh->x;
|
||
rclDst.top = poh->y;
|
||
rclDst.right = rclDst.left + pdsurf->sizl.cx;
|
||
rclDst.bottom = rclDst.top + pdsurf->sizl.cy;
|
||
|
||
ptlSrc.x = 0;
|
||
ptlSrc.y = 0;
|
||
|
||
ppdev->pfnPutBits(ppdev, pdsurf->pso, &rclDst, &ptlSrc);
|
||
|
||
// Update the data structures to reflect the new off-screen node:
|
||
|
||
pso = pdsurf->pso;
|
||
pdsurf->dt = DT_SCREEN;
|
||
pdsurf->poh = poh;
|
||
poh->pdsurf = pdsurf;
|
||
|
||
// Now free the DIB. Get the hsurf from the SURFOBJ before we unlock
|
||
// it (it's not legal to dereference psoDib when it's unlocked):
|
||
|
||
hsurf = pso->hsurf;
|
||
EngUnlockSurface(pso);
|
||
EngDeleteSurface(hsurf);
|
||
|
||
return(TRUE);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* OH* pohMoveOffscreenDfbToDib
|
||
*
|
||
* Converts the DFB from being off-screen to being a DIB.
|
||
*
|
||
* Note: The caller does NOT have to call 'pohFree' on 'poh' after making
|
||
* this call.
|
||
*
|
||
* Returns: NULL if the function failed (due to a memory allocation).
|
||
* Otherwise, it returns a pointer to the coalesced off-screen heap
|
||
* node that has been made available for subsequent allocations
|
||
* (useful when trying to free enough memory to make a new
|
||
* allocation).
|
||
\**************************************************************************/
|
||
|
||
OH* pohMoveOffscreenDfbToDib(
|
||
PDEV* ppdev,
|
||
OH* poh)
|
||
{
|
||
DSURF* pdsurf;
|
||
HBITMAP hbmDib;
|
||
SURFOBJ* pso;
|
||
RECTL rclDst;
|
||
POINTL ptlSrc;
|
||
|
||
DISPDBG((15, "Throwing out %li x %li at (%li, %li)!",
|
||
poh->cx, poh->cy, poh->x, poh->y));
|
||
|
||
pdsurf = poh->pdsurf;
|
||
|
||
ASSERTDD((poh->x != 0) || (poh->y != 0),
|
||
"Can't make the visible screen into a DIB");
|
||
ASSERTDD(pdsurf->dt != DT_DIB,
|
||
"Can't make a DIB into even more of a DIB");
|
||
|
||
hbmDib = EngCreateBitmap(pdsurf->sizl, 0, ppdev->iBitmapFormat,
|
||
BMF_TOPDOWN, NULL);
|
||
if (hbmDib)
|
||
{
|
||
if (EngAssociateSurface((HSURF) hbmDib, ppdev->hdevEng, 0))
|
||
{
|
||
pso = EngLockSurface((HSURF) hbmDib);
|
||
if (pso != NULL)
|
||
{
|
||
rclDst.left = 0;
|
||
rclDst.top = 0;
|
||
rclDst.right = pdsurf->sizl.cx;
|
||
rclDst.bottom = pdsurf->sizl.cy;
|
||
|
||
ptlSrc.x = poh->x;
|
||
ptlSrc.y = poh->y;
|
||
|
||
ppdev->pfnGetBits(ppdev, pso, &rclDst, &ptlSrc);
|
||
|
||
pdsurf->dt = DT_DIB;
|
||
pdsurf->pso = pso;
|
||
|
||
// Don't even bother checking to see if this DIB should
|
||
// be put back into off-screen memory until the next
|
||
// heap 'free' occurs:
|
||
|
||
pdsurf->iUniq = ppdev->iHeapUniq;
|
||
pdsurf->cBlt = 0;
|
||
|
||
// Remove this node from the off-screen DFB list, and free
|
||
// it. 'pohFree' will never return NULL:
|
||
|
||
return(pohFree(ppdev, poh));
|
||
}
|
||
}
|
||
|
||
// Fail case:
|
||
|
||
EngDeleteSurface((HSURF) hbmDib);
|
||
}
|
||
|
||
return(NULL);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* BOOL bMoveEverythingFromOffscreenToDibs
|
||
*
|
||
* This function is used when we're about to enter full-screen mode, which
|
||
* would wipe all our off-screen bitmaps. GDI can ask us to draw on
|
||
* device bitmaps even when we're in full-screen mode, and we do NOT have
|
||
* the option of stalling the call until we switch out of full-screen.
|
||
* We have no choice but to move all the off-screen DFBs to DIBs.
|
||
*
|
||
* Returns TRUE if all DSURFs have been successfully moved.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
BOOL bMoveAllDfbsFromOffscreenToDibs(
|
||
PDEV* ppdev)
|
||
{
|
||
// Throw out any discardable bitmaps over the entire surface:
|
||
|
||
return(bDiscardEverythingInRectangle(ppdev, 0, 0,
|
||
ppdev->cxMemory, ppdev->cyMemory));
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* HBITMAP DrvCreateDeviceBitmap
|
||
*
|
||
* Function called by GDI to create a device-format-bitmap (DFB). We will
|
||
* always try to allocate the bitmap in off-screen; if we can't, we simply
|
||
* fail the call and GDI will create and manage the bitmap itself.
|
||
*
|
||
* Note: We do not have to zero the bitmap bits. GDI will automatically
|
||
* call us via DrvBitBlt to zero the bits (which is a security
|
||
* consideration).
|
||
*
|
||
\**************************************************************************/
|
||
|
||
HBITMAP DrvCreateDeviceBitmap(
|
||
DHPDEV dhpdev,
|
||
SIZEL sizl,
|
||
ULONG iFormat)
|
||
{
|
||
PDEV* ppdev;
|
||
OH* poh;
|
||
DSURF* pdsurf;
|
||
HBITMAP hbmDevice;
|
||
FLONG flHooks;
|
||
|
||
//return 0; //RKE:
|
||
ppdev = (PDEV*) dhpdev;
|
||
|
||
// If we're in full-screen mode, we hardly have any off-screen memory
|
||
// in which to allocate a DFB. LATER: We could still allocate an
|
||
// OH node and put the bitmap on the DIB DFB list for later promotion.
|
||
|
||
if (!ppdev->bEnabled)
|
||
return(0);
|
||
|
||
// We only support device bitmaps that are the same colour depth
|
||
// as our display.
|
||
//
|
||
// Actually, those are the only kind GDI will ever call us with,
|
||
// but we may as well check. Note that this implies you'll never
|
||
// get a crack at 1bpp bitmaps.
|
||
|
||
if (iFormat != ppdev->iBitmapFormat)
|
||
return(0);
|
||
|
||
// We don't want anything 8x8 or smaller -- they're typically brush
|
||
// patterns which we don't particularly want to stash in off-screen
|
||
// memory:
|
||
|
||
if ((sizl.cx <= 8) && (sizl.cy <= 8))
|
||
return(0);
|
||
|
||
// Since 24bpp mach32 is GDI-managed, and we don't have access to
|
||
// vGetBits and vPutBits as a consequence, we reject device bitmaps.
|
||
if (iFormat == BMF_24BPP && ppdev->iAsic != ASIC_88800GX)
|
||
return 0;
|
||
|
||
poh = pohAllocate(ppdev, NULL, sizl.cx, sizl.cy, 0);
|
||
if (poh != NULL)
|
||
{
|
||
pdsurf = AtiAllocMem(LMEM_FIXED, 0, sizeof(DSURF));
|
||
if (pdsurf != NULL)
|
||
{
|
||
hbmDevice = EngCreateDeviceBitmap((DHSURF) pdsurf, sizl, iFormat);
|
||
if (hbmDevice != NULL)
|
||
{
|
||
flHooks = ppdev->flHooks;
|
||
|
||
// Setting the SYNCHRONIZEACCESS flag tells GDI that we
|
||
// want all drawing to the bitmaps to be synchronized (GDI
|
||
// is multi-threaded and by default does not synchronize
|
||
// device bitmap drawing -- it would be a Bad Thing for us
|
||
// to have multiple threads using the accelerator at the
|
||
// same time):
|
||
|
||
flHooks |= HOOK_SYNCHRONIZEACCESS;
|
||
|
||
// It's a device-managed surface; make sure we don't set
|
||
// HOOK_SYNCHRONIZE, otherwise we may confuse GDI:
|
||
|
||
flHooks &= ~HOOK_SYNCHRONIZE;
|
||
|
||
if (EngAssociateSurface((HSURF) hbmDevice, ppdev->hdevEng,
|
||
flHooks))
|
||
{
|
||
pdsurf->dt = DT_SCREEN;
|
||
pdsurf->poh = poh;
|
||
pdsurf->sizl = sizl;
|
||
pdsurf->ppdev = ppdev;
|
||
poh->pdsurf = pdsurf;
|
||
|
||
return(hbmDevice);
|
||
}
|
||
|
||
EngDeleteSurface((HSURF) hbmDevice);
|
||
}
|
||
AtiFreeMem(pdsurf);
|
||
}
|
||
pohFree(ppdev, poh);
|
||
}
|
||
|
||
return(0);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* VOID DrvDeleteDeviceBitmap
|
||
*
|
||
* Deletes a DFB.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
VOID DrvDeleteDeviceBitmap(
|
||
DHSURF dhsurf)
|
||
{
|
||
DSURF* pdsurf;
|
||
PDEV* ppdev;
|
||
SURFOBJ* psoDib;
|
||
HSURF hsurfDib;
|
||
|
||
pdsurf = (DSURF*) dhsurf;
|
||
ppdev = pdsurf->ppdev;
|
||
|
||
if (pdsurf->dt == DT_SCREEN)
|
||
{
|
||
pohFree(ppdev, pdsurf->poh);
|
||
}
|
||
else
|
||
{
|
||
ASSERTDD(pdsurf->dt == DT_DIB, "Expected DIB type");
|
||
|
||
psoDib = pdsurf->pso;
|
||
|
||
// Get the hsurf from the SURFOBJ before we unlock it (it's not
|
||
// legal to dereference psoDib when it's unlocked):
|
||
|
||
hsurfDib = psoDib->hsurf;
|
||
EngUnlockSurface(psoDib);
|
||
EngDeleteSurface(hsurfDib);
|
||
}
|
||
|
||
AtiFreeMem(pdsurf);
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* BOOL bAssertModeOffscreenHeap
|
||
*
|
||
* This function is called whenever we switch in or out of full-screen
|
||
* mode. We have to convert all the off-screen bitmaps to DIBs when
|
||
* we switch to full-screen (because we may be asked to draw on them even
|
||
* when in full-screen, and the mode switch would probably nuke the video
|
||
* memory contents anyway).
|
||
*
|
||
\**************************************************************************/
|
||
|
||
BOOL bAssertModeOffscreenHeap(
|
||
PDEV* ppdev,
|
||
BOOL bEnable)
|
||
{
|
||
BOOL b = TRUE;
|
||
|
||
if (!bEnable)
|
||
{
|
||
b = bMoveAllDfbsFromOffscreenToDibs(ppdev);
|
||
}
|
||
|
||
return b;
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* VOID vDisableOffscreenHeap
|
||
*
|
||
* Frees any resources allocated by the off-screen heap.
|
||
*
|
||
\**************************************************************************/
|
||
|
||
VOID vDisableOffscreenHeap(
|
||
PDEV* ppdev)
|
||
{
|
||
OHALLOC* poha;
|
||
OHALLOC* pohaNext;
|
||
SURFOBJ* psoPunt;
|
||
HSURF hsurf;
|
||
|
||
psoPunt = ppdev->psoPunt;
|
||
if (psoPunt != NULL)
|
||
{
|
||
hsurf = psoPunt->hsurf;
|
||
EngUnlockSurface(psoPunt);
|
||
EngDeleteSurface(hsurf);
|
||
}
|
||
|
||
psoPunt = ppdev->psoPunt2;
|
||
if (psoPunt != NULL)
|
||
{
|
||
hsurf = psoPunt->hsurf;
|
||
EngUnlockSurface(psoPunt);
|
||
EngDeleteSurface(hsurf);
|
||
}
|
||
|
||
poha = ppdev->heap.pohaChain;
|
||
while (poha != NULL)
|
||
{
|
||
pohaNext = poha->pohaNext; // Grab the next pointer before it's freed
|
||
AtiFreeMem(poha);
|
||
poha = pohaNext;
|
||
}
|
||
}
|
||
|
||
/******************************Public*Routine******************************\
|
||
* BOOL bEnableOffscreenHeap
|
||
*
|
||
* Initializes the off-screen heap using all available video memory,
|
||
* accounting for the portion taken by the visible screen.
|
||
*
|
||
* Input: ppdev->cxScreen
|
||
* ppdev->cyScreen
|
||
* ppdev->cxMemory
|
||
* ppdev->cyMemory
|
||
*
|
||
\**************************************************************************/
|
||
|
||
BOOL bEnableOffscreenHeap(
|
||
PDEV* ppdev)
|
||
{
|
||
OH* poh;
|
||
SIZEL sizl;
|
||
HSURF hsurf;
|
||
POINTL ptlScreen;
|
||
|
||
DISPDBG((15, "Screen: %li x %li Memory: %li x %li",
|
||
ppdev->cxScreen, ppdev->cyScreen, ppdev->cxMemory, ppdev->cyMemory));
|
||
|
||
ASSERTDD((ppdev->cxScreen <= ppdev->cxMemory) &&
|
||
(ppdev->cyScreen <= ppdev->cyMemory),
|
||
"Memory must not have smaller dimensions than visible screen!");
|
||
|
||
ppdev->heap.pohaChain = NULL;
|
||
ppdev->heap.pohFreeList = NULL;
|
||
|
||
// Initialize the available list, which will be a circular
|
||
// doubly-linked list kept in ascending 'cxcy' order, with a
|
||
// 'sentinel' at the end of the list:
|
||
|
||
poh = pohNewNode(ppdev);
|
||
if (poh == NULL)
|
||
goto ReturnFalse;
|
||
|
||
// The first node describes the entire video memory size:
|
||
|
||
poh->pohNext = &ppdev->heap.ohFree;
|
||
poh->pohPrev = &ppdev->heap.ohFree;
|
||
poh->ohState = OH_FREE;
|
||
poh->x = 0;
|
||
poh->y = 0;
|
||
poh->cx = ppdev->cxMemory;
|
||
poh->cy = ppdev->cyMemory;
|
||
poh->cxcy = CXCY(ppdev->cxMemory, ppdev->cyMemory);
|
||
poh->pohLeft = &ppdev->heap.ohFree;
|
||
poh->pohUp = &ppdev->heap.ohFree;
|
||
poh->pohRight = &ppdev->heap.ohFree;
|
||
poh->pohDown = &ppdev->heap.ohFree;
|
||
poh->pvScan0 = ppdev->pjScreen;
|
||
|
||
// The second node is our free list sentinel:
|
||
|
||
ppdev->heap.ohFree.pohNext = poh;
|
||
ppdev->heap.ohFree.pohPrev = poh;
|
||
ppdev->heap.ohFree.cxcy = CXCY_SENTINEL;
|
||
ppdev->heap.ohFree.cx = 0x7fffffff;
|
||
ppdev->heap.ohFree.cy = 0x7fffffff;
|
||
ppdev->heap.ohFree.ohState = OH_FREE;
|
||
|
||
// Initialize the discardable list, which will be a circular
|
||
// doubly-linked list kept in order, with a sentinel at the end.
|
||
// This node is also used for the screen-surface, for its offset:
|
||
|
||
ppdev->heap.ohDiscardable.pohNext = &ppdev->heap.ohDiscardable;
|
||
ppdev->heap.ohDiscardable.pohPrev = &ppdev->heap.ohDiscardable;
|
||
ppdev->heap.ohDiscardable.ohState = OH_DISCARDABLE;
|
||
|
||
// Initialize the permanent list, which will be a circular
|
||
// doubly-linked list kept in order, with a sentinel at the end.
|
||
|
||
ppdev->heap.ohPermanent.pohNext = &ppdev->heap.ohPermanent;
|
||
ppdev->heap.ohPermanent.pohPrev = &ppdev->heap.ohPermanent;
|
||
ppdev->heap.ohPermanent.ohState = OH_PERMANENT;
|
||
|
||
// For the moment, make the max really big so that the first
|
||
// allocation we're about to do will succeed:
|
||
|
||
ppdev->heap.cxMax = 0x7fffffff;
|
||
ppdev->heap.cyMax = 0x7fffffff;
|
||
|
||
ptlScreen.x = 0;
|
||
ptlScreen.y = 0;
|
||
|
||
// Finally, reserve the upper-left corner for the screen. We can
|
||
// actually throw away 'poh' because we'll never need it again
|
||
// (not even for disabling the off-screen heap since everything is
|
||
// freed using OHALLOCs):
|
||
|
||
poh = pohAllocate(ppdev, &ptlScreen, ppdev->cxScreen, ppdev->cyScreen,
|
||
FLOH_MAKE_PERMANENT);
|
||
|
||
ASSERTDD((poh != NULL) && (poh->x == 0) && (poh->y == 0) &&
|
||
(poh->cx >= ppdev->cxScreen) && (poh->cy >= ppdev->cyScreen),
|
||
"Screen allocation messed up");
|
||
|
||
// Remember it so that we can associate the screen SURFOBJ with this
|
||
// poh:
|
||
|
||
ppdev->pohScreen = poh;
|
||
|
||
// Allocate a 'punt' SURFOBJ we'll use when the device-bitmap is in
|
||
// off-screen memory, but we want GDI to draw to it directly as an
|
||
// engine-managed surface:
|
||
|
||
sizl.cx = ppdev->cxMemory;
|
||
sizl.cy = ppdev->cyMemory;
|
||
|
||
// We want to create it with exactly the same hooks and capabilities
|
||
// as our primary surface. We will override the 'lDelta' and 'pvScan0'
|
||
// fields later:
|
||
|
||
hsurf = (HSURF) EngCreateBitmap(sizl,
|
||
0xbadf00d,
|
||
ppdev->iBitmapFormat,
|
||
BMF_TOPDOWN,
|
||
(VOID*) 0xbadf00d);
|
||
|
||
if ((hsurf == 0) ||
|
||
(!EngAssociateSurface(hsurf, ppdev->hdevEng, ppdev->flHooks)) ||
|
||
(!(ppdev->psoPunt = EngLockSurface(hsurf))))
|
||
{
|
||
DISPDBG((0, "Failed punt surface creation"));
|
||
|
||
EngDeleteSurface(hsurf);
|
||
goto ReturnFalse;
|
||
}
|
||
|
||
// We need another for doing DrvBitBlt and DrvCopyBits when both
|
||
// surfaces are off-screen bitmaps:
|
||
|
||
hsurf = (HSURF) EngCreateBitmap(sizl,
|
||
0xbadf00d,
|
||
ppdev->iBitmapFormat,
|
||
BMF_TOPDOWN,
|
||
(VOID*) 0xbadf00d);
|
||
|
||
if ((hsurf == 0) ||
|
||
(!EngAssociateSurface(hsurf, ppdev->hdevEng, ppdev->flHooks)) ||
|
||
(!(ppdev->psoPunt2 = EngLockSurface(hsurf))))
|
||
{
|
||
DISPDBG((0, "Failed punt surface creation"));
|
||
|
||
EngDeleteSurface(hsurf);
|
||
goto ReturnFalse;
|
||
}
|
||
|
||
DISPDBG((5, "Passed bEnableOffscreenHeap"));
|
||
|
||
if (poh != NULL)
|
||
return(TRUE);
|
||
|
||
ReturnFalse:
|
||
|
||
DISPDBG((0, "Failed bEnableOffscreenHeap"));
|
||
|
||
return(FALSE);
|
||
}
|
||
|