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bug 56314 reverse selection colors when page background is similar to default selection background. Updating the algorithm. r/sr=bzbarsky, a=dbaron

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This commit is contained in:
masayuki%d-toybox.com 2005-04-19 06:05:22 +00:00
parent 809daeede7
commit b895cffb5f
3 changed files with 34 additions and 17 deletions
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2
layout/base/nsCSSColorUtils.cpp
View File

@ -185,7 +185,7 @@ int NS_GetBrightness(PRUint8 aRed, PRUint8 aGreen, PRUint8 aBlue)
(luminosity * LUMINOSITY_FACTOR)) / 100;
}
PRUint32 NS_GetLuminosity(nscolor aColor)
PRInt32 NS_GetLuminosity(nscolor aColor)
{
return (NS_GET_R(aColor) * RED_LUMINOSITY +
NS_GET_G(aColor) * GREEN_LUMINOSITY +

2
layout/base/nsCSSColorUtils.h
View File

@ -63,7 +63,7 @@ int NS_GetBrightness(PRUint8 aRed, PRUint8 aGreen, PRUint8 aBlue);
// Get Luminosity of a specific color. That is same as Y of YIQ color space.
// The range of return value is 0 to 255000.
PRUint32 NS_GetLuminosity(nscolor aColor);
PRInt32 NS_GetLuminosity(nscolor aColor);
// function to convert from RGB color space to HSV color space
void NS_RGB2HSV(nscolor aColor,PRUint16 &aHue,PRUint16 &aSat,PRUint16 &aValue);

47
layout/generic/nsTextFrame.cpp
View File

@ -995,6 +995,8 @@ private:
PRUint8 * mTypes;
PRBool mInit;
PRInt16 mSelectionStatus;//see nsIDocument.h SetDisplaySelection()
nscolor mFrameBackgroundColor;
PRInt32 mSufficientContrast;
nscolor mDisabledColor;
nscolor mAttentionColor;
@ -1026,6 +1028,11 @@ DrawSelectionIterator::DrawSelectionIterator(nsIContent *aContent,
mSelectionPseudoStyle = PR_FALSE;
mSelectionPseudoBGIsTransparent = PR_FALSE;
const nsStyleBackground* bg =
nsCSSRendering::FindNonTransparentBackground(aStyleContext);
NS_ASSERTION(bg, "Cannot find NonTransparentBackground.");
mFrameBackgroundColor = bg->mBackgroundColor;
if (aContent) {
nsRefPtr<nsStyleContext> sc;
sc = aPresContext->StyleSet()->
@ -1033,7 +1040,7 @@ DrawSelectionIterator::DrawSelectionIterator(nsIContent *aContent,
nsCSSPseudoElements::mozSelection, aStyleContext);
if (sc) {
mSelectionPseudoStyle = PR_TRUE;
const nsStyleBackground* bg = sc->GetStyleBackground();
bg = sc->GetStyleBackground();
mSelectionPseudoBGIsTransparent = PRBool(bg->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT);
if (!mSelectionPseudoBGIsTransparent )
mSelectionPseudoBGcolor = bg->mBackgroundColor;
@ -1043,6 +1050,9 @@ DrawSelectionIterator::DrawSelectionIterator(nsIContent *aContent,
// Get background colors for disabled selection at attention-getting selection (used with type ahead find)
nsILookAndFeel *look = aPresContext->LookAndFeel();
nscolor defaultWindowBackgroundColor;
look->GetColor(nsILookAndFeel::eColor_WindowBackground,
defaultWindowBackgroundColor);
look->GetColor(nsILookAndFeel::eColor_TextSelectBackgroundAttention,
mAttentionColor);
look->GetColor(nsILookAndFeel::eColor_TextSelectBackgroundDisabled,
@ -1052,6 +1062,13 @@ DrawSelectionIterator::DrawSelectionIterator(nsIContent *aContent,
mAttentionColor = EnsureDifferentColors(mAttentionColor,
mOldStyle.mSelectionBGColor);
mSufficientContrast =
PR_MIN(PR_MIN(NS_SUFFICIENT_LUMINOSITY_DIFFERENCE,
NS_LUMINOSITY_DIFFERENCE(mOldStyle.mSelectionTextColor,
mOldStyle.mSelectionBGColor)),
NS_LUMINOSITY_DIFFERENCE(defaultWindowBackgroundColor,
mOldStyle.mSelectionBGColor));
if (!aSelDetails)
{
mDone = PR_TRUE;
@ -1263,22 +1280,22 @@ DrawSelectionIterator::GetSelectionColors(nscolor *aForeColor,
return PR_TRUE;
}
// Note: We assume that the combination of the background color and text color
// of selection is sufficient contrast. Because if it isn't, user cannot read
// the selection text.
// If the combination of the selection text color and the original text color
// are sufficient contrast, probably these background colors are not alike.
// Therefore, we should not exchange selection colors.
if (NS_LUMINOSITY_DIFFERENCE(*aForeColor, mOldStyle.mColor->mColor) >=
NS_SUFFICIENT_LUMINOSITY_DIFFERENCE)
// If the combination of selection background color and frame background color
// is sufficient contrast, don't exchange the selection colors.
PRInt32 backLuminosityDifference =
NS_LUMINOSITY_DIFFERENCE(*aBackColor, mFrameBackgroundColor);
if (backLuminosityDifference >= mSufficientContrast)
return PR_TRUE;
// Otherwise, if those colors are similar, those background colors may be similar.
// Therefore, we should exchange the colors.
nscolor tmpColor = *aForeColor;
*aForeColor = *aBackColor;
*aBackColor = tmpColor;
// Otherwise, we should use the higher-contrast color for the selection
// background color.
PRInt32 foreLuminosityDifference =
NS_LUMINOSITY_DIFFERENCE(*aForeColor, mFrameBackgroundColor);
if (backLuminosityDifference < foreLuminosityDifference) {
nscolor tmpColor = *aForeColor;
*aForeColor = *aBackColor;
*aBackColor = tmpColor;
}
return PR_TRUE;
}