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Bug 537890. Part 5: Make pc, in, mm and cm be a fixed number of CSS pixels. r=dbaron

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This commit is contained in:
Robert O'Callahan 2010-08-13 21:58:02 +12:00
parent 049e9fe833
commit ff8ac74b16
2 changed files with 19 additions and 48 deletions
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44
layout/style/nsCSSValue.cpp
View File

@ -234,35 +234,9 @@ imgIRequest* nsCSSValue::GetImageValue() const
nscoord nsCSSValue::GetFixedLength(nsPresContext* aPresContext) const
{
NS_ASSERTION(IsFixedLengthUnit(), "not a fixed length unit");
float twips;
switch (mUnit) {
case eCSSUnit_Inch:
twips = NS_INCHES_TO_TWIPS(mValue.mFloat);
break;
case eCSSUnit_Millimeter:
twips = NS_MILLIMETERS_TO_TWIPS(mValue.mFloat);
break;
case eCSSUnit_PhysicalMillimeter:
twips = NS_MILLIMETERS_TO_TWIPS(mValue.mFloat);
break;
case eCSSUnit_Centimeter:
twips = NS_CENTIMETERS_TO_TWIPS(mValue.mFloat);
break;
case eCSSUnit_Pica:
twips = NS_PICAS_TO_TWIPS(mValue.mFloat);
break;
default:
NS_ERROR("should never get here");
return 0;
}
NS_ASSERTION(mUnit == eCSSUnit_PhysicalMillimeter, "not a fixed length unit");
float twips = NS_MILLIMETERS_TO_TWIPS(mValue.mFloat);
return aPresContext->TwipsToAppUnits(twips);
}
@ -270,17 +244,19 @@ nscoord nsCSSValue::GetPixelLength() const
{
NS_ASSERTION(IsPixelLengthUnit(), "not a fixed length unit");
double scaleFactor;
switch (mUnit) {
case eCSSUnit_Pixel:
return nsPresContext::CSSPixelsToAppUnits(mValue.mFloat);
case eCSSUnit_Point:
return nsPresContext::CSSPixelsToAppUnits(mValue.mFloat*4/3);
case eCSSUnit_Pixel: return nsPresContext::CSSPixelsToAppUnits(mValue.mFloat);
case eCSSUnit_Pica: scaleFactor = 16.0; break;
case eCSSUnit_Point: scaleFactor = 4/3.0; break;
case eCSSUnit_Inch: scaleFactor = 96.0; break;
case eCSSUnit_Millimeter: scaleFactor = 96/25.4; break;
case eCSSUnit_Centimeter: scaleFactor = 96/2.54; break;
default:
NS_ERROR("should never get here");
return 0;
}
return nsPresContext::CSSPixelsToAppUnits(float(mValue.mFloat*scaleFactor));
}
void nsCSSValue::DoReset()

23
layout/style/nsCSSValue.h
View File

@ -148,17 +148,8 @@ enum nsCSSUnit {
eCSSUnit_Percent = 90, // (float) 1.0 == 100%) value is percentage of something
eCSSUnit_Number = 91, // (float) value is numeric (usually multiplier, different behavior that percent)
// Length units - fixed
// US English
eCSSUnit_Inch = 100, // (float) 0.0254 meters
// Metric
eCSSUnit_Millimeter = 207, // (float) 1/1000 meter
eCSSUnit_PhysicalMillimeter = 208, // (float) 1/1000 meter
eCSSUnit_Centimeter = 209, // (float) 1/100 meter
// US Typographic
eCSSUnit_Pica = 301, // (float) 12 points == 1/6 inch
// Physical length units
eCSSUnit_PhysicalMillimeter = 200, // (float) 1/25.4 inch
// Length units - relative
// Font relative measure
@ -169,7 +160,11 @@ enum nsCSSUnit {
// Screen relative measure
eCSSUnit_Point = 900, // (float) 4/3 of a CSS pixel
eCSSUnit_Pixel = 901, // (float) CSS pixel unit
eCSSUnit_Inch = 901, // (float) 96 CSS pixels
eCSSUnit_Millimeter = 902, // (float) 96/25.4 CSS pixels
eCSSUnit_Centimeter = 903, // (float) 96/2.54 CSS pixels
eCSSUnit_Pica = 904, // (float) 12 points == 16 CSS pixls
eCSSUnit_Pixel = 905, // (float) CSS pixel unit
// Angular units
eCSSUnit_Degree = 1000, // (float) 360 per circle
@ -231,14 +226,14 @@ public:
nsCSSUnit GetUnit() const { return mUnit; }
PRBool IsLengthUnit() const
{ return eCSSUnit_Inch <= mUnit && mUnit <= eCSSUnit_Pixel; }
{ return eCSSUnit_PhysicalMillimeter <= mUnit && mUnit <= eCSSUnit_Pixel; }
/**
* A "fixed" length unit is one that means a specific physical length
* which we try to match based on the physical characteristics of an
* output device.
*/
PRBool IsFixedLengthUnit() const
{ return eCSSUnit_Inch <= mUnit && mUnit <= eCSSUnit_Pica; }
{ return mUnit == eCSSUnit_PhysicalMillimeter; }
/**
* What the spec calls relative length units is, for us, split
* between relative length units and pixel length units.