extern "C" NS_GFX_(PRBool) NS_ASCIIHexToRGB(const nsCString& aColorSpec,
nscolor* aResult)
{
const char* buffer = aColorSpec.get();
int nameLen = aColorSpec.Length();
if ((nameLen == 3) || (nameLen == 6)) {
// Make sure the digits are legal
for (int i = 0; i < nameLen; i++) {
char ch = buffer[i];
if (((ch >= '0') && (ch <= '9')) ||
((ch >= 'a') && (ch <= 'f')) ||
((ch >= 'A') && (ch <= 'F'))) {
// Legal character
continue;
}
// Whoops. Illegal character.
return PR_FALSE;
}
// Convert the ascii to binary
int dpc = ((3 == nameLen) ? 1 : 2);
// Translate components from hex to binary
int r = ComponentValue(buffer, nameLen, 0, dpc);
int g = ComponentValue(buffer, nameLen, 1, dpc);
int b = ComponentValue(buffer, nameLen, 2, dpc);
if (dpc == 1) {
// Scale single digit component to an 8 bit value. Replicate the
// single digit to compute the new value.
r = (r << 4) | r;
g = (g << 4) | g;
b = (b << 4) | b;
}
NS_ASSERTION((r >= 0) && (r <= 255), "bad r");
NS_ASSERTION((g >= 0) && (g <= 255), "bad g");
NS_ASSERTION((b >= 0) && (b <= 255), "bad b");
if (nsnull != aResult) {
*aResult = NS_RGB(r, g, b);
}
return PR_TRUE;
}
// Improperly formatted color value
return PR_FALSE;
}
bool HexToRGB(const std::string& aBuf, Color& aResult)
{
const char* buffer = aBuf.c_str();
int nameLen = aBuf.size();
if ((nameLen == 3) || (nameLen == 6)) {
// Make sure the digits are legal
for (int i = 0; i < nameLen; i++) {
char ch = buffer[i];
if (((ch >= '0') && (ch <= '9')) ||
((ch >= 'a') && (ch <= 'f')) ||
((ch >= 'A') && (ch <= 'F'))) {
// Legal character
continue;
}
// Whoops. Illegal character.
return false;
}
// Convert the ascii to binary
int dpc = ((3 == nameLen) ? 1 : 2);
// Translate components from hex to binary
int r = ComponentValue(buffer, nameLen, 0, dpc);
int g = ComponentValue(buffer, nameLen, 1, dpc);
int b = ComponentValue(buffer, nameLen, 2, dpc);
if (dpc == 1) {
// Scale single digit component to an 8 bit value. Replicate the
// single digit to compute the new value.
r = (r << 4) | r;
g = (g << 4) | g;
b = (b << 4) | b;
}
assert((r >= 0) && (r <= 255));
assert((g >= 0) && (g <= 255));
assert((b >= 0) && (b <= 255));
aResult = ColorSetRGB(r, g, b);
return true;
}
// Improperly formatted color value
return false;
}
// compatible with legacy Nav behavior
extern "C" NS_GFX_(PRBool) NS_LooseHexToRGB(const nsString& aColorSpec, nscolor* aResult)
{
// XXXldb nsStackString<30>
NS_LossyConvertUCS2toASCII buffer(aColorSpec);
int nameLen = buffer.Length();
const char* colorSpec = buffer.get();
if ('#' == colorSpec[0]) {
++colorSpec;
--nameLen;
}
if (3 < nameLen) {
// Convert the ascii to binary
int dpc = (nameLen / 3) + (((nameLen % 3) != 0) ? 1 : 0);
if (4 < dpc) {
dpc = 4;
}
// Translate components from hex to binary
int r = ComponentValue(colorSpec, nameLen, 0, dpc);
int g = ComponentValue(colorSpec, nameLen, 1, dpc);
int b = ComponentValue(colorSpec, nameLen, 2, dpc);
NS_ASSERTION((r >= 0) && (r <= 255), "bad r");
NS_ASSERTION((g >= 0) && (g <= 255), "bad g");
NS_ASSERTION((b >= 0) && (b <= 255), "bad b");
if (nsnull != aResult) {
*aResult = NS_RGB(r, g, b);
}
}
else {
if (nsnull != aResult) {
*aResult = NS_RGB(0, 0, 0);
}
}
return PR_TRUE;
}
// This implements part of the algorithm for legacy behavior described in
// http://www.whatwg.org/specs/web-apps/current-work/complete/common-microsyntaxes.html#rules-for-parsing-a-legacy-color-value
NS_GFX_(PRBool) NS_LooseHexToRGB(const nsString& aColorSpec, nscolor* aResult)
{
if (aColorSpec.EqualsLiteral("transparent")) {
return PR_FALSE;
}
int nameLen = aColorSpec.Length();
const PRUnichar* colorSpec = aColorSpec.get();
if (nameLen > 128) {
nameLen = 128;
}
if ('#' == colorSpec[0]) {
++colorSpec;
--nameLen;
}
// digits per component
int dpc = (nameLen + 2) / 3;
int newdpc = dpc;
// Use only the rightmost 8 characters of each component.
if (newdpc > 8) {
nameLen -= newdpc - 8;
colorSpec += newdpc - 8;
newdpc = 8;
}
// And then keep trimming characters at the left until we'd trim one
// that would leave a nonzero value, but not past 2 characters per
// component.
while (newdpc > 2) {
PRBool haveNonzero = PR_FALSE;
for (int c = 0; c < 3; ++c) {
NS_ABORT_IF_FALSE(c * dpc < nameLen,
"should not pass end of string while newdpc > 2");
PRUnichar ch = colorSpec[c * dpc];
if (('1' <= ch && ch <= '9') ||
('A' <= ch && ch <= 'F') ||
('a' <= ch && ch <= 'f')) {
haveNonzero = PR_TRUE;
break;
}
}
if (haveNonzero) {
break;
}
--newdpc;
--nameLen;
++colorSpec;
}
// Translate components from hex to binary
int r = ComponentValue(colorSpec, nameLen, 0, dpc);
int g = ComponentValue(colorSpec, nameLen, 1, dpc);
int b = ComponentValue(colorSpec, nameLen, 2, dpc);
NS_ASSERTION((r >= 0) && (r <= 255), "bad r");
NS_ASSERTION((g >= 0) && (g <= 255), "bad g");
NS_ASSERTION((b >= 0) && (b <= 255), "bad b");
*aResult = NS_RGB(r, g, b);
return PR_TRUE;
}
