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Bug 370553: fix crash with very large dpi values, plus some comment changes. r+sr=roc.

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This commit is contained in:
sharparrow1%yahoo.com 2007-02-17 10:59:20 +00:00
parent 69c87b57a7
commit e237216d29
1 changed files with 10 additions and 5 deletions
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15
gfx/src/thebes/nsThebesDeviceContext.cpp
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@ -138,12 +138,12 @@ nsThebesDeviceContext::SetDPI()
{
PRInt32 dpi = 96;
// Set prefVal the value of the preference
// Get prefVal the value of the preference
// "layout.css.dpi"
// or -1 if we can't get it.
// If it's negative, we pretend it's not set.
// If it's 0, it means force use of the operating system's logical
// resolution.
// If it's negative, use the default DPI setting
// If it's 0, force the use of the OS's set resolution. Set this if your
// X server has the correct DPI and it's less than 96dpi.
// If it's positive, we use it as the logical resolution
nsresult rv;
PRInt32 prefDPI;
@ -196,7 +196,12 @@ nsThebesDeviceContext::SetDPI()
if (prefDPI > 0 && !mPrinter)
dpi = prefDPI;
mAppUnitsPerDevPixel = AppUnitsPerCSSPixel() / PR_MAX(1, (dpi + 48) / 96);
// First figure out the closest multiple of 96, which is the number of
// dev pixels per CSS pixel. Then, divide that into AppUnitsPerCSSPixel()
// to get the number of app units per dev pixel. The PR_MAXes are to
// make sure we don't end up dividing by zero.
mAppUnitsPerDevPixel = PR_MAX(1, AppUnitsPerCSSPixel() /
PR_MAX(1, (dpi + 48) / 96));
mAppUnitsPerInch = NSIntPixelsToAppUnits(dpi, mAppUnitsPerDevPixel);
return NS_OK;