Fix unit tests - Color.rgb is Android only API and not available in junit -> own method

Author: gsantner

Diff for: app/src/main/java/net/gsantner/markor/format/csv/CsvSyntaxHighlighter.java

@@ -13,6 +13,7 @@
 import net.gsantner.markor.format.markdown.MarkdownSyntaxHighlighter;
 import net.gsantner.markor.model.AppSettings;
 import net.gsantner.opoc.format.GsTextUtils;
+import net.gsantner.opoc.util.GsContextUtils;
 
 import org.apache.commons.lang3.ArrayUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -25,7 +26,7 @@ public class CsvSyntaxHighlighter extends MarkdownSyntaxHighlighter {
     // dkgray is not much different from black and not readable with black background
     // blue is difficuilt to read on black background
     private static final int[] COLUMN_COLORS = {
-            Color.RED, Color.rgb(150, 150, 255), Color.MAGENTA,
+            Color.RED, GsContextUtils.rgb(150, 150, 255), Color.MAGENTA,
             0xff00b04c, // dark green,
             0xffdaa500}; // brown
     private static final String TAG = CsvSyntaxHighlighter.class.getSimpleName();

Diff for: app/src/main/java/net/gsantner/opoc/util/GsContextUtils.java

@@ -609,6 +609,17 @@ public boolean shouldColorOnTopBeLight(@ColorInt final int colorOnBottomInt) {
                 + (0.114 * Color.blue(colorOnBottomInt)))));
     }
 
+    @ColorInt
+    public static int rgb(final int r, final int g, final int b) {
+        return argb(255, r, g, b);
+    }
+
+    @ColorInt
+    public static int argb(final int a, final int r, final int g, final int b) {
+        return (Math.max(0, Math.min(255, a)) << 24) | (Math.max(0, Math.min(255, r)) << 16) | (Math.max(0, Math.min(255, g)) << 8) | Math.max(0, Math.min(255, b));
+    }
+
+
     /**
      * Convert a html string to an android {@link Spanned} object
      */
@@ -853,7 +864,7 @@ public Bitmap drawTextOnDrawable(final Context context, @DrawableRes final int d
         bitmap = bitmap.copy(bitmap.getConfig(), true);
         Canvas canvas = new Canvas(bitmap);
         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
-        paint.setColor(Color.rgb(61, 61, 61));
+        paint.setColor(GsContextUtils.rgb(61, 61, 61));
         paint.setTextSize((int) (textSize * scale));
         paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);