1221 lines
36 KiB
C
1221 lines
36 KiB
C
/******************************Module*Header*******************************\
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* Module Name: heap.c
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*
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* This module contains the routines for a 2-d heap. It is used primarily
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* for allocating space for device-format-bitmaps in off-screen memory.
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*
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* Off-screen bitmaps are a big deal on NT because:
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*
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* 1) It reduces the working set. Any bitmap stored in off-screen
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* memory is a bitmap that isn't taking up space in main memory.
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*
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* 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.
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*
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* The heap algorithm employed herein attempts to solve an unsolvable
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* problem: the problem of keeping arbitrary sized bitmaps as packed as
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* possible in a 2-d space, when the bitmaps can come and go at random.
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*
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* This problem is due entirely to the nature of the hardware for which this
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* 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
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* the heap to avoid segmentation).
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*
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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.
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*
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* When the heap gets full, old allocations will automatically be punted
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* from off-screen and copied to DIBs, which we'll let GDI draw on.
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*
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* Note that this heap manages reverse-L shape off-screen memory
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* configurations (where the scan pitch is longer than the visible screen,
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* such as happens at 800x600 when the scan length must be a multiple of
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* 1024).
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*
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* NOTE: All heap operations must be done under some sort of synchronization,
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* whether it's controlled by GDI or explicitly by the driver. All
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* the routines in this module assume that they have exclusive access
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* to the heap data structures; multiple threads partying in here at
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* the same time would be a Bad Thing. (By default, GDI does NOT
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* synchronize drawing on device-created bitmaps.)
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*
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* Copyright (c) 1993-1995 Microsoft Corporation
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\**************************************************************************/
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#include "precomp.h"
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#define OH_ALLOC_SIZE 4000 // Do all memory allocations in 4k chunks
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#define OH_QUANTUM 8 // The minimum dimension of an allocation
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#define CXCY_SENTINEL 0x7fffffff // The sentinel at the end of the available
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// list has this very large 'cxcy' value
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// This macro results in the available list being maintained with a
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// cx-major, cy-minor sort:
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#define CXCY(cx, cy) (((cx) << 16) | (cy))
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/******************************Public*Routine******************************\
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* OH* pohNewNode
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*
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* Allocates a basic memory unit in which we'll pack our data structures.
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*
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* Since we'll have a lot of OH nodes, most of which we will be
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* 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 EngAllocMem(sizeof(OH)) every time we needed a new node. There
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* would be no locality; OH nodes would get scattered throughout memory,
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* and as we traversed the available list for one of our allocations,
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* it would be far more likely that we would hit a hard page fault.
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\**************************************************************************/
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OH* pohNewNode(
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PDEV* ppdev)
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{
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LONG i;
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LONG cOhs;
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OHALLOC* poha;
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OH* poh;
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if (ppdev->heap.pohFreeList == NULL)
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{
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// We zero-init to initialize all the OH flags, and to help in
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// debugging (we can afford to do this since we'll be doing this
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// very infrequently):
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poha = EngAllocMem(FL_ZERO_MEMORY, OH_ALLOC_SIZE, ALLOC_TAG);
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if (poha == NULL)
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return(NULL);
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// Insert this OHALLOC at the begining of the OHALLOC chain:
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poha->pohaNext = ppdev->heap.pohaChain;
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ppdev->heap.pohaChain = poha;
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// This has a '+ 1' because OHALLOC includes an extra OH in its
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// structure declaration:
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cOhs = (OH_ALLOC_SIZE - sizeof(OHALLOC)) / sizeof(OH) + 1;
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// The big OHALLOC allocation is simply a container for a bunch of
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// OH data structures in an array. The new OH data structures are
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// linked together and added to the OH free list:
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poh = &poha->aoh[0];
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for (i = cOhs - 1; i != 0; i--)
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{
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poh->pohNext = poh + 1;
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poh = poh + 1;
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}
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poh->pohNext = NULL;
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ppdev->heap.pohFreeList = &poha->aoh[0];
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}
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poh = ppdev->heap.pohFreeList;
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ppdev->heap.pohFreeList = poh->pohNext;
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return(poh);
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}
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/******************************Public*Routine******************************\
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* VOID vOhFreeNode
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*
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* Frees our basic data structure allocation unit by adding it to a free
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* list.
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*
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\**************************************************************************/
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VOID vOhFreeNode(
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PDEV* ppdev,
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OH* poh)
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{
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if (poh == NULL)
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return;
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poh->pohNext = ppdev->heap.pohFreeList;
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ppdev->heap.pohFreeList = poh;
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poh->ofl = 0;
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}
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/******************************Public*Routine******************************\
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* OH* pohFree
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*
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* Frees an off-screen heap allocation. The free space will be combined
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* with any adjacent free spaces to avoid segmentation of the 2-d heap.
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*
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* Note: A key idea here is that the data structure for the upper-left-
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* most node must be kept at the same physical CPU memory so that
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* adjacency links are kept correctly (when two free spaces are
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* merged, the lower or right node can be freed).
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*
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\**************************************************************************/
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OH* pohFree(
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PDEV* ppdev,
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OH* poh)
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{
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ULONG cxcy;
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OH* pohBeside;
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OH* pohNext;
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OH* pohPrev;
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if (poh == NULL)
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return(NULL);
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DISPDBG((1, "Freeing %li x %li at (%li, %li)",
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poh->cx, poh->cy, poh->x, poh->y));
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// Update the uniqueness to show that space has been freed, so that
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// we may decide to see if some DIBs can be moved back into off-screen
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// memory:
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ppdev->iHeapUniq++;
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MergeLoop:
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ASSERTDD(!(poh->ofl & OFL_PERMANENT), "Can't free permanents for now");
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// Try merging with the right sibling:
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pohBeside = poh->pohRight;
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if ((pohBeside->ofl & OFL_AVAILABLE) &&
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(pohBeside->cy == poh->cy) &&
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(pohBeside->pohUp == poh->pohUp) &&
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(pohBeside->pohDown == poh->pohDown) &&
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(pohBeside->pohRight->pohLeft != pohBeside))
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{
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// Add the right rectangle to ours:
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poh->cx += pohBeside->cx;
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poh->pohRight = pohBeside->pohRight;
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// Remove 'pohBeside' from the ??? list and free it:
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pohBeside->pohNext->pohPrev = pohBeside->pohPrev;
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pohBeside->pohPrev->pohNext = pohBeside->pohNext;
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vOhFreeNode(ppdev, pohBeside);
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goto MergeLoop;
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}
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// Try merging with the lower sibling:
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pohBeside = poh->pohDown;
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if ((pohBeside->ofl & OFL_AVAILABLE) &&
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(pohBeside->cx == poh->cx) &&
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(pohBeside->pohLeft == poh->pohLeft) &&
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(pohBeside->pohRight == poh->pohRight) &&
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(pohBeside->pohDown->pohUp != pohBeside))
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{
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poh->cy += pohBeside->cy;
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poh->pohDown = pohBeside->pohDown;
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pohBeside->pohNext->pohPrev = pohBeside->pohPrev;
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pohBeside->pohPrev->pohNext = pohBeside->pohNext;
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vOhFreeNode(ppdev, pohBeside);
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goto MergeLoop;
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}
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// Try merging with the left sibling:
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pohBeside = poh->pohLeft;
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if ((pohBeside->ofl & OFL_AVAILABLE) &&
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(pohBeside->cy == poh->cy) &&
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(pohBeside->pohUp == poh->pohUp) &&
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(pohBeside->pohDown == poh->pohDown) &&
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(pohBeside->pohRight == poh) &&
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(poh->pohRight->pohLeft != poh))
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{
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// We add our rectangle to the one to the left:
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pohBeside->cx += poh->cx;
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pohBeside->pohRight = poh->pohRight;
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// Remove 'poh' from the ??? list and free it:
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poh->pohNext->pohPrev = poh->pohPrev;
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poh->pohPrev->pohNext = poh->pohNext;
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vOhFreeNode(ppdev, poh);
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poh = pohBeside;
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goto MergeLoop;
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}
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// Try merging with the upper sibling:
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pohBeside = poh->pohUp;
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if ((pohBeside->ofl & OFL_AVAILABLE) &&
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(pohBeside->cx == poh->cx) &&
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(pohBeside->pohLeft == poh->pohLeft) &&
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(pohBeside->pohRight == poh->pohRight) &&
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(pohBeside->pohDown == poh) &&
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(poh->pohDown->pohUp != poh))
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{
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pohBeside->cy += poh->cy;
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pohBeside->pohDown = poh->pohDown;
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poh->pohNext->pohPrev = poh->pohPrev;
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poh->pohPrev->pohNext = poh->pohNext;
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vOhFreeNode(ppdev, poh);
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poh = pohBeside;
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goto MergeLoop;
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}
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// Remove the node from the ???list if it was in use (we wouldn't
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// want to do this for a OFL_PERMANENT node that had been freed):
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poh->pohNext->pohPrev = poh->pohPrev;
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poh->pohPrev->pohNext = poh->pohNext;
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cxcy = CXCY(poh->cx, poh->cy);
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// Insert the node into the available list:
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pohNext = ppdev->heap.ohAvailable.pohNext;
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while (pohNext->cxcy < cxcy)
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{
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pohNext = pohNext->pohNext;
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}
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pohPrev = pohNext->pohPrev;
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pohPrev->pohNext = poh;
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pohNext->pohPrev = poh;
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poh->pohPrev = pohPrev;
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poh->pohNext = pohNext;
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poh->ofl = OFL_AVAILABLE;
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poh->cxcy = cxcy;
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// Return the node pointer for the new and improved available rectangle:
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return(poh);
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}
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/******************************Public*Routine******************************\
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* OH* pohAllocate
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*
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* Allocates space for an off-screen rectangle. It will attempt to find
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* the smallest available free rectangle, and will allocate the block out
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* of its upper-left corner. The remaining two rectangles will be placed
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* on the available free space list.
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*
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* If the rectangle would have been large enough to fit into off-screen
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* memory, but there is not enough available free space, we will boot
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* bitmaps out of off-screen and into DIBs until there is enough room.
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*
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\**************************************************************************/
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OH* pohAllocate(
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PDEV* ppdev,
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LONG cxThis, // Width of rectangle to be allocated
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LONG cyThis, // Height of rectangle to be allocated
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FLOH floh) // Allocation flags
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{
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ULONG cxcyThis; // Width and height search key
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OH* pohThis; // Points to found available rectangle we'll use
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ULONG cxcy; // Temporary versions
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OH* pohNext;
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OH* pohPrev;
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LONG cxRem;
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LONG cyRem;
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OH* pohBelow;
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LONG cxBelow;
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LONG cyBelow;
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OH* pohBeside;
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LONG cxBeside;
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LONG cyBeside;
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DISPDBG((1, "Allocating %li x %li...", cxThis, cyThis));
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ASSERTDD((cxThis > 0) && (cyThis > 0), "Illegal allocation size");
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// Increase the width to get the proper alignment (thus ensuring that all
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// allocations will be properly aligned):
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cxThis = (cxThis + (HEAP_X_ALIGNMENT - 1)) & ~(HEAP_X_ALIGNMENT - 1);
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// We can't succeed if the requested rectangle is larger than the
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// largest possible available rectangle:
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if ((cxThis > ppdev->heap.cxMax) || (cyThis > ppdev->heap.cyMax))
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return(NULL);
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// Find the first available rectangle the same size or larger than
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// the requested one:
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cxcyThis = CXCY(cxThis, cyThis);
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pohThis = ppdev->heap.ohAvailable.pohNext;
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while (pohThis->cxcy < cxcyThis)
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{
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pohThis = pohThis->pohNext;
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}
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while (pohThis->cy < cyThis)
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{
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pohThis = pohThis->pohNext;
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}
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if (pohThis->cxcy == CXCY_SENTINEL)
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{
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// There was no space large enough...
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if (floh & FLOH_ONLY_IF_ROOM)
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return(NULL);
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// We couldn't find an available rectangle that was big enough
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// to fit our request. So throw things out of the heap until we
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// have room:
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do {
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pohThis = ppdev->heap.ohDfb.pohPrev; // Least-recently blitted
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ASSERTDD(pohThis != &ppdev->heap.ohDfb, "Ran out of in-use entries");
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// We can safely exit here if we have to:
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pohThis = pohMoveOffscreenDfbToDib(ppdev, pohThis);
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if (pohThis == NULL)
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return(NULL);
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} while ((pohThis->cx < cxThis) || (pohThis->cy < cyThis));
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}
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// We've now found an available rectangle that is the same size or
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// bigger than our requested rectangle. We're going to use the
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// upper-left corner of our found rectangle, and divide the unused
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// remainder into two rectangles which will go on the available
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// list.
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// Compute the width of the unused rectangle to the right, and the
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// height of the unused rectangle below:
|
|
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cyRem = pohThis->cy - cyThis;
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cxRem = pohThis->cx - cxThis;
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|
|
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// Given finite area, we wish to find the two rectangles that are
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// most square -- i.e., the arrangement that gives two rectangles
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// with the least perimiter:
|
|
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cyBelow = cyRem;
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cxBeside = cxRem;
|
|
|
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if (cxRem <= cyRem)
|
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{
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cxBelow = cxThis + cxRem;
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cyBeside = cyThis;
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}
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else
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{
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cxBelow = cxThis;
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cyBeside = cyThis + cyRem;
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}
|
|
|
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// We only make new available rectangles of the unused right and bottom
|
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// portions if they're greater in dimension than OH_QUANTUM (it hardly
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// makes sense to do the book-work to keep around a 2-pixel wide
|
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// available space, for example):
|
|
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pohBeside = NULL;
|
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if (cxBeside >= OH_QUANTUM)
|
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{
|
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pohBeside = pohNewNode(ppdev);
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if (pohBeside == NULL)
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return(NULL);
|
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}
|
|
|
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pohBelow = NULL;
|
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if (cyBelow >= OH_QUANTUM)
|
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{
|
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pohBelow = pohNewNode(ppdev);
|
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if (pohBelow == NULL)
|
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{
|
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vOhFreeNode(ppdev, pohBeside);
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return(NULL);
|
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}
|
|
|
|
// Insert this rectangle into the available list (which is
|
|
// sorted on ascending cxcy):
|
|
|
|
cxcy = CXCY(cxBelow, cyBelow);
|
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pohNext = ppdev->heap.ohAvailable.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->cxcy = cxcy;
|
|
pohBelow->ofl = OFL_AVAILABLE;
|
|
pohBelow->x = pohThis->x;
|
|
pohBelow->y = pohThis->y + cyThis;
|
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pohBelow->cx = cxBelow;
|
|
pohBelow->cy = cyBelow;
|
|
|
|
// Modify the current node to reflect the changes we've made:
|
|
|
|
pohThis->cy = cyThis;
|
|
}
|
|
|
|
if (cxBeside >= OH_QUANTUM)
|
|
{
|
|
// Insert this rectangle into the available list (which is
|
|
// sorted on ascending cxcy):
|
|
|
|
cxcy = CXCY(cxBeside, cyBeside);
|
|
pohNext = ppdev->heap.ohAvailable.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->cxcy = cxcy;
|
|
pohBeside->ofl = OFL_AVAILABLE;
|
|
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->ofl = OFL_INUSE;
|
|
pohThis->cxcy = CXCY(pohThis->cx, pohThis->cy);
|
|
pohThis->pdsurf = NULL; // Caller is responsible for
|
|
// setting this field
|
|
|
|
// Remove this from the available list:
|
|
|
|
pohThis->pohPrev->pohNext = pohThis->pohNext;
|
|
pohThis->pohNext->pohPrev = pohThis->pohPrev;
|
|
|
|
// Now insert this at the head of the DFB list:
|
|
|
|
pohThis->pohNext = ppdev->heap.ohDfb.pohNext;
|
|
pohThis->pohPrev = &ppdev->heap.ohDfb;
|
|
ppdev->heap.ohDfb.pohNext->pohPrev = pohThis;
|
|
ppdev->heap.ohDfb.pohNext = pohThis;
|
|
|
|
DISPDBG((1, " Allocated at (%li, %li)", pohThis->x, pohThis->y));
|
|
|
|
// Calculate the effective start address for this bitmap in off-
|
|
// screen memory:
|
|
|
|
pohThis->pvScan0 = ppdev->pjScreen + (pohThis->y * ppdev->lDelta)
|
|
+ (pohThis->x * ppdev->cjPel);
|
|
|
|
return(pohThis);
|
|
}
|
|
|
|
/******************************Public*Routine******************************\
|
|
* VOID vCalculateMaxmimum
|
|
*
|
|
* Traverses the list of in-use and available rectangles to find the one
|
|
* with the maximal area.
|
|
*
|
|
\**************************************************************************/
|
|
|
|
VOID vCalculateMaximum(
|
|
PDEV* ppdev)
|
|
{
|
|
OH* poh;
|
|
OH* pohSentinel;
|
|
LONG lArea;
|
|
LONG lMaxArea;
|
|
LONG cxMax;
|
|
LONG cyMax;
|
|
LONG i;
|
|
|
|
lMaxArea = 0;
|
|
cxMax = 0;
|
|
cyMax = 0;
|
|
|
|
// First time through, loop through the list of available rectangles:
|
|
|
|
pohSentinel = &ppdev->heap.ohAvailable;
|
|
|
|
for (i = 2; i != 0; i--)
|
|
{
|
|
for (poh = pohSentinel->pohNext; poh != pohSentinel; poh = poh->pohNext)
|
|
{
|
|
ASSERTDD(!(poh->ofl & OFL_PERMANENT),
|
|
"Permanent in available/DFB chain?");
|
|
|
|
// 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 in-use rectangles:
|
|
|
|
pohSentinel = &ppdev->heap.ohDfb;
|
|
}
|
|
|
|
// 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* pohAllocatePermanent
|
|
*
|
|
* 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.
|
|
*
|
|
\**************************************************************************/
|
|
|
|
OH* pohAllocatePermanent(
|
|
PDEV* ppdev,
|
|
LONG cx,
|
|
LONG cy)
|
|
{
|
|
OH* poh;
|
|
|
|
poh = pohAllocate(ppdev, cx, cy, 0);
|
|
if (poh != NULL)
|
|
{
|
|
// Mark the rectangle as permanent:
|
|
|
|
poh->ofl = OFL_PERMANENT;
|
|
|
|
// Remove the node from the most-recently blitted list:
|
|
|
|
poh->pohPrev->pohNext = poh->pohNext;
|
|
poh->pohNext->pohPrev = poh->pohPrev;
|
|
poh->pohPrev = NULL;
|
|
poh->pohNext = NULL;
|
|
|
|
// Now calculate the new maximum size rectangle available in the
|
|
// heap:
|
|
|
|
vCalculateMaximum(ppdev);
|
|
}
|
|
|
|
return(poh);
|
|
}
|
|
|
|
/******************************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, 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;
|
|
|
|
vPutBits(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((1, "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;
|
|
|
|
vGetBits(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)
|
|
{
|
|
OH* poh;
|
|
OH* pohNext;
|
|
BOOL bRet;
|
|
|
|
bRet = TRUE;
|
|
poh = ppdev->heap.ohDfb.pohNext;
|
|
while (poh != &ppdev->heap.ohDfb)
|
|
{
|
|
pohNext = poh->pohNext;
|
|
|
|
// If something's already a DIB, we shouldn't try to make it even
|
|
// more of a DIB:
|
|
|
|
if (poh->pdsurf->dt == DT_SCREEN)
|
|
{
|
|
if (!pohMoveOffscreenDfbToDib(ppdev, poh))
|
|
bRet = FALSE;
|
|
}
|
|
|
|
poh = pohNext;
|
|
}
|
|
|
|
return(bRet);
|
|
}
|
|
|
|
/******************************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;
|
|
|
|
// 8 bit stretch blts fail for unknown reasons on ppc, so preclude
|
|
// accelerated offscreen bitmaps.
|
|
#ifdef PPC
|
|
return (0);
|
|
#endif
|
|
|
|
ppdev = (PDEV*) dhpdev;
|
|
|
|
// We don't bother supporting device bitmaps with the P9000 when at
|
|
// 16bpp or 32bpp:
|
|
|
|
if (ppdev->flStat & STAT_UNACCELERATED)
|
|
return(0);
|
|
|
|
// 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);
|
|
|
|
poh = pohAllocate(ppdev, sizl.cx, sizl.cy, 0);
|
|
if (poh != NULL)
|
|
{
|
|
pdsurf = EngAllocMem(0, sizeof(DSURF), ALLOC_TAG);
|
|
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);
|
|
}
|
|
EngFreeMem(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);
|
|
}
|
|
|
|
EngFreeMem(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;
|
|
|
|
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
|
|
EngFreeMem(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;
|
|
|
|
DISPDBG((5, "Screen: %li x %li Memory: %li x %li",
|
|
ppdev->cxScreen, ppdev->cyScreen, ppdev->cxMemory, ppdev->cyMemory));
|
|
|
|
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.ohAvailable;
|
|
poh->pohPrev = &ppdev->heap.ohAvailable;
|
|
poh->ofl = OFL_AVAILABLE;
|
|
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.ohAvailable;
|
|
poh->pohUp = &ppdev->heap.ohAvailable;
|
|
poh->pohRight = &ppdev->heap.ohAvailable;
|
|
poh->pohDown = &ppdev->heap.ohAvailable;
|
|
poh->pvScan0 = ppdev->pjScreen;
|
|
|
|
// The second node is our available list sentinel:
|
|
|
|
ppdev->heap.ohAvailable.pohNext = poh;
|
|
ppdev->heap.ohAvailable.pohPrev = poh;
|
|
ppdev->heap.ohAvailable.cxcy = CXCY_SENTINEL;
|
|
ppdev->heap.ohAvailable.cx = 0x7fffffff;
|
|
ppdev->heap.ohAvailable.cy = 0x7fffffff;
|
|
ppdev->heap.ohAvailable.ofl = OFL_PERMANENT;
|
|
ppdev->heap.ohDfb.pohLeft = NULL;
|
|
ppdev->heap.ohDfb.pohUp = NULL;
|
|
ppdev->heap.ohDfb.pohRight = NULL;
|
|
ppdev->heap.ohDfb.pohDown = NULL;
|
|
|
|
// Initialize the most-recently-blitted DFB 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.ohDfb.pohNext = &ppdev->heap.ohDfb;
|
|
ppdev->heap.ohDfb.pohPrev = &ppdev->heap.ohDfb;
|
|
ppdev->heap.ohDfb.ofl = OFL_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;
|
|
|
|
// 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 = pohAllocatePermanent(ppdev, ppdev->cxScreen, ppdev->cyScreen);
|
|
|
|
// Remember it so that we can associate the screen SURFOBJ with this
|
|
// poh:
|
|
|
|
ppdev->pohScreen = poh;
|
|
|
|
ASSERTDD((poh != NULL) && (poh->x == 0) && (poh->y == 0),
|
|
"We assumed allocator would use the upper-left corner");
|
|
|
|
// 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, capabilities,
|
|
// and screen delta as our primary surface:
|
|
|
|
hsurf = (HSURF) EngCreateBitmap(sizl,
|
|
ppdev->lDelta,
|
|
ppdev->iBitmapFormat,
|
|
BMF_TOPDOWN,
|
|
ppdev->pjScreen);
|
|
|
|
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,
|
|
ppdev->lDelta,
|
|
ppdev->iBitmapFormat,
|
|
BMF_TOPDOWN,
|
|
ppdev->pjScreen);
|
|
|
|
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);
|
|
}
|