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#190255

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r=pedemonte, sr=blizzard (platform specific), a=mkaply
OS/2 only - occasional pixel error when scrolling


git-svn-id: svn://10.0.0.236/trunk@146522 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
mkaply%us.ibm.com
2003-09-02 21:22:09 +00:00
parent 759f5bf65d
commit 7eaed53c77
1 changed files with 7 additions and 15 deletions
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22
mozilla/gfx/src/os2/nsDeviceContextOS2.cpp
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@@ -151,16 +151,10 @@ nsresult nsDeviceContextOS2::Init( nsNativeDeviceContext aContext,
long dpi;
GFX (::DevQueryCaps(mPrintDC, CAPS_VERTICAL_FONT_RES, 1, &dpi), FALSE);
int pt2t = 72;
// make p2t a nice round number - this prevents rounding problems
// mPixelsToTwips = float(NSToIntRound(float(NSIntPointsToTwips(pt2t)) / float(dpi)));
// mTwipsToPixels = 1.0f / mPixelsToTwips;
mTwipsToPixels = ((float)dpi) / (float)NSIntPointsToTwips(72);
mPixelsToTwips = 1.0f / mTwipsToPixels;
GetTwipsToDevUnits( newscale);
mPixelsToTwips = NSToIntRound((float)NSIntPointsToTwips(72) / ((float)dpi));
mTwipsToPixels = 1.0 / mPixelsToTwips;
GetTwipsToDevUnits(newscale);
// On OS/2, origscale can be different based on the video resolution.
// On 640x480, it's 1/15, on everything else it is 1/12.
// For consistent printing, 1/15 is the correct value to use.
@@ -170,8 +164,8 @@ nsresult nsDeviceContextOS2::Init( nsNativeDeviceContext aContext,
mCPixelScale = newscale / origscale;
aOrigContext->GetTwipsToDevUnits( t2d);
aOrigContext->GetAppUnitsToDevUnits( a2d);
aOrigContext->GetTwipsToDevUnits(t2d);
aOrigContext->GetAppUnitsToDevUnits(a2d);
mAppUnitsToDevUnits = (a2d / t2d) * mTwipsToPixels;
mDevUnitsToAppUnits = 1.0f / mAppUnitsToDevUnits;
@@ -605,10 +599,8 @@ nsDeviceContextOS2::SetDPI(PRInt32 aPrefDPI)
int pt2t = 72;
// make p2t a nice round number - this prevents rounding problems
// mPixelsToTwips = float(NSToIntRound(float(NSIntPointsToTwips(pt2t)) / float(mDpi)));
// mTwipsToPixels = 1.0f / mPixelsToTwips;
mTwipsToPixels = ((float)mDpi) / (float)NSIntPointsToTwips(72);
mPixelsToTwips = 1.0f / mTwipsToPixels;
mPixelsToTwips = float(NSToIntRound(float(NSIntPointsToTwips(pt2t)) / float(mDpi)));
mTwipsToPixels = 1.0f / mPixelsToTwips;
// XXX need to reflow all documents
return NS_OK;