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add apg's change to colorizing, no more background changes needed

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This commit is contained in:
uberspot 2014-03-13 16:09:37 +02:00
parent f5c50c3896
commit f055228e5b
1 changed files with 29 additions and 13 deletions
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42
OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyMainFragment.java
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@ -283,31 +283,47 @@ public class ViewKeyMainFragment extends Fragment implements
try { try {
// for each 4 characters of the fingerprint + 1 space // for each 4 characters of the fingerprint + 1 space
for (int i = 0; i < fingerprint.length(); i += 5) { for (int i = 0; i < fingerprint.length(); i += 5) {
int minFingLength = Math.min(i + 4, fingerprint.length()); int spanEnd = Math.min(i + 4, fingerprint.length());
String fourChars = fingerprint.substring(i, minFingLength); String fourChars = fingerprint.substring(i, spanEnd);
int raw = Integer.parseInt(fourChars, 16); int raw = Integer.parseInt(fourChars, 16);
byte[] bytes = {(byte) ((raw >> 8) & 0xff - 128), (byte) (raw & 0xff - 128)}; byte[] bytes = {(byte) ((raw >> 8) & 0xff - 128), (byte) (raw & 0xff - 128)};
int[] color = OtherHelper.getRgbForData(bytes); int[] color = OtherHelper.getRgbForData(bytes);
int r = color[0];
int g = color[1];
int b = color[2];
// we cannot change black by multiplication, so adjust it to an almost-black grey,
// which will then be brightened to the minimal brightness level
if (r == 0 && g == 0 && b == 0) {
r = 1;
g = 1;
b = 1;
}
// Convert rgb to brightness // Convert rgb to brightness
int brightness = (int) (0.2126*color[0] + 0.7152*color[1] + 0.0722*color[2]); double brightness = 0.2126 * r + 0.7152 * g + 0.0722 * b;
// Detect dark colors and invert their background to white to make them more distinguishable // If a color is too dark to be seen on black,
if (brightness < 40) { // then brighten it up to a minimal brightness.
sb.setSpan(new BackgroundColorSpan(Color.WHITE), if (brightness < 80) {
i, minFingLength, Spannable.SPAN_INCLUSIVE_INCLUSIVE); double factor = 80.0 / brightness;
r = Math.min(255, (int) (r * factor));
g = Math.min(255, (int) (g * factor));
b = Math.min(255, (int) (b * factor));
// Detect bright colors and invert their background to black to make them more distinguishable // If it is too light, then darken it to a respective maximal brightness.
} else if (brightness > 210) { } else if (brightness > 180) {
sb.setSpan(new BackgroundColorSpan(Color.BLACK), double factor = 180.0 / brightness;
i, minFingLength, Spannable.SPAN_INCLUSIVE_INCLUSIVE); r = (int) (r * factor);
g = (int) (g * factor);
b = (int) (b * factor);
} }
// Create a foreground color with the 3 digest integers as RGB // Create a foreground color with the 3 digest integers as RGB
// and then converting that int to hex to use as a color // and then converting that int to hex to use as a color
sb.setSpan(new ForegroundColorSpan(Color.rgb(color[0], color[1], color[2])), sb.setSpan(new ForegroundColorSpan(Color.rgb(r, g, b)),
i, minFingLength, Spannable.SPAN_INCLUSIVE_INCLUSIVE); i, spanEnd, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
} }
} catch (Exception e) { } catch (Exception e) {
Log.e(Constants.TAG, "Colorization failed", e); Log.e(Constants.TAG, "Colorization failed", e);