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Fudge the dpi into something that makes for more rational scaling to twips

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kipp%netscape.com 1999-03-18 21:18:40 +00:00
parent f015e3ae42
commit db724a0ad5
1 changed files with 25 additions and 3 deletions
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28
gfx/src/gtk/nsDeviceContextGTK.cpp
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@ -64,12 +64,34 @@ NS_IMETHODIMP nsDeviceContextGTK::Init(nsNativeWidget aNativeWidget)
mWidget = aNativeWidget;
// this is used for something odd. who knows
mTwipsToPixels = (((float)::gdk_screen_width()) /
((float)::gdk_screen_width_mm()) * 25.4) /
// Compute dpi of display
float screenWidth = float(::gdk_screen_width());
float screenWidthIn = float(::gdk_screen_width_mm()) / 25.4f;
nscoord dpi = nscoord(screenWidth / screenWidthIn);
// Now for some wacky heuristics.
if (dpi < 84) dpi = 72;
else if (dpi < 108) dpi = 96;
else if (dpi < 132) dpi = 120;
mTwipsToPixels = float(dpi) / float(NSIntPointsToTwips(72));
mPixelsToTwips = 1.0f / mTwipsToPixels;
#ifdef DEBUG
static PRBool once = PR_TRUE;
if (once) {
printf("GFX: dpi=%d t2p=%g p2t=%g\n", dpi, mTwipsToPixels, mPixelsToTwips);
once = PR_FALSE;
}
#endif
#if 0
mTwipsToPixels = ( ((float)::gdk_screen_width()) /
((float)::gdk_screen_width_mm()) * 25.4) /
(float)NSIntPointsToTwips(72);
mPixelsToTwips = 1.0f / mTwipsToPixels;
#endif
vis = gdk_rgb_get_visual();
mDepth = vis->depth;