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b=130027 r=karnaze sr=attinasi a=scc. fix PatBlt to be used only in optimized cases.

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This commit is contained in:
dcone%netscape.com 2002-03-20 14:53:57 +00:00
parent 87dc44d63e
commit 0eff8bfd46
1 changed files with 26 additions and 12 deletions
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38
gfx/src/windows/nsImageWin.cpp
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@ -814,16 +814,36 @@ NS_IMETHODIMP nsImageWin::DrawTile(nsIRenderingContext &aContext,
::DeleteObject(memDC);
return(PR_TRUE);
}
}
// figure out which case to use for tiling
PRBool useSlow = PR_FALSE;
if ((mAlphaDepth>8) || ((mAlphaDepth==8)&&tryAgain) || (canRaster==DT_RASPRINTER)
|| (256==mNumPaletteColors)){
// CASE 1 -- ALPHA DEPTH IS TO HIGH OR WE ARE PRINTING OR ALPHA ALGORITHM FROM ABOVE FAILED
useSlow = PR_TRUE;
} else if ( (imageScaledWidth>MAX_BUFFER_WIDTH) || (imageScaledHeight>MAX_BUFFER_HEIGHT)) {
if(PR_TRUE != gIsWinNT){
// CASE 2 -- THE PLATFORM IS NOT ON NT AND CAN NOT USE A PATBLT
useSlow = PR_TRUE;
} else {
if( (imageScaledWidth < MAX_BUFFER_WIDTH) || (imageScaledHeight < MAX_BUFFER_HEIGHT) ) {
// CASE 3 -- THE PLATFORM IS ON NT AND WE HAVE ONE LARGE AND ONE SMALL WIDTH AND HEIGHT
return ( PatBltTile(aContext,aSurface,aX0,aY0,aX1,aY1) );
} else {
// CASE 4 -- THE PLATFORM IS ON NT AND BOTH THE WIDTH AND HEIGHT ARE LARGE.
// -- THIS IS AN ODD CASE.. SEEMS PATBLT WITH LARGER BRUSHES HAS A DIFFICULT TIME
// -- AND THE TIMES ARE SLOWER.
useSlow = PR_TRUE;
}
}
}
// if Alpha is greater than 8 or is 8 but failed or we are printing or we have a color lookup
// or.. we are not on windows NT and the tile is larger than our buffer, PatBlt on nt can handle that case
if ((mAlphaDepth>8) || ((mAlphaDepth==8)&&tryAgain) || (canRaster==DT_RASPRINTER)
|| (256==mNumPaletteColors) ||
( (PR_TRUE != gIsWinNT) && ((imageScaledWidth>MAX_BUFFER_WIDTH) || (imageScaledHeight>MAX_BUFFER_HEIGHT)) ) ){
if(useSlow){
for(y=aY0;y<aY1;y+=imageScaledHeight){
for(x=aX0;x<aX1;x+=imageScaledWidth){
Draw(aContext, aSurface,
@ -832,12 +852,6 @@ NS_IMETHODIMP nsImageWin::DrawTile(nsIRenderingContext &aContext,
}
}
return(PR_TRUE);
}
// now try to pattern blit.. if that fails.. we use our own algorithm to get
// things fast
if ( PR_TRUE == PatBltTile(aContext,aSurface,aX0,aY0,aX1,aY1) ){
return(PR_TRUE);
}