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fix crashing of some magnification filters by allocation way too much memory. why wasn't this done long ago?

This commit is contained in:
zeromus 2015-09-27 22:15:25 +00:00
parent 6536230867
commit 15b6e7dbea
1 changed files with 17 additions and 5 deletions
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22
desmume/src/windows/video.h
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@ -1,5 +1,5 @@
/*
Copyright (C) 2009-2011 DeSmuME team
Copyright (C) 2009-2015 DeSmuME team
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -37,6 +37,7 @@ public:
int prescalePost; //not supported yet
int prescaleTotal;
int scratchBufferSize;
u8* srcBuffer;
int srcBufferSize;
u32 *buffer;
@ -49,12 +50,23 @@ public:
prescaleTotal = prescaleHD;
const int kInflationFactor = 5*5; //the largest filter is going up 5x in each dimension
int bufferSize = kInflationFactor * 256*192*2*prescaleHD * 4;
const int kInflationFactor = 5; //the largest filter is going up 5x in each dimension
//all these stupid video filters read outside of their buffer. let's allocate too much and hope it stays filled with black. geeze
const int kPadSize = 4;
int scratchBufferWidth = 256*kInflationFactor*prescaleHD + (kPadSize*2);
int scratchBufferHeight = 192*2*prescaleHD*kInflationFactor + (kPadSize*2);
scratchBufferSize = scratchBufferWidth * scratchBufferHeight * 4;
//why are these the same size, anyway?
buffer = (u32*)malloc_alignedCacheLine(bufferSize);
filteredbuffer = (u32*)malloc_alignedCacheLine(bufferSize);
buffer = (u32*)malloc_alignedCacheLine(scratchBufferSize);
filteredbuffer = (u32*)malloc_alignedCacheLine(scratchBufferSize);
clear();
//move the buffer pointer inside it's padded area so that earlier reads won't go out of the buffer we allocated
buffer += (kPadSize*scratchBufferWidth + kPadSize)*4;
setfilter(currentfilter);
}