fix issues #76, #72 - High DPI (Retina) displays support

src/dlangui/core/types.d

@@ -189,7 +189,12 @@ immutable int SIZE_IN_PERCENTS_FLAG = 0x0800_0000;
 
 /// convert custom size to pixels (sz can be either pixels, or points if SIZE_IN_POINTS_FLAG bit set)
 int toPixels(int sz) {
-    return sz > 0 ? ((sz & SIZE_IN_POINTS_FLAG) ? pointsToPixels(sz ^ SIZE_IN_POINTS_FLAG) : sz) : sz;
+    if (sz > 0 && (sz & SIZE_IN_POINTS_FLAG) != 0) {
+        import dlangui.core.logger;
+        Log.d("size in points");
+        return pointsToPixels(sz ^ SIZE_IN_POINTS_FLAG);
+    }
+    return sz;
 }
 
 /// convert custom size Point to pixels (sz can be either pixels, or points if SIZE_IN_POINTS_FLAG bit set)

src/dlangui/graphics/resources.d

@@ -273,21 +273,34 @@ class FrameDrawable : Drawable {
 
 enum DimensionUnits {
     pixels,
-    points
+    points,
+    percents
 }
 
 /// decode size string, e.g. 1px or 2 or 3pt
 static uint decodeDimension(string s) {
     uint value = 0;
     DimensionUnits units = DimensionUnits.pixels;
+    bool dotFound = false;
+    uint afterPointValue = 0;
+    uint afterPointDivider = 1;
     foreach(c; s) {
         int digit = -1;
         if (c >='0' && c <= '9')
             digit = c - '0';
-        if (digit >= 0)
+        if (digit >= 0) {
+            if (dotFound) {
+                afterPointValue = afterPointValue * 10 + digit;
+                afterPointDivider *= 10;
+            } else {
                 value = value * 10 + digit;
-        else if (c == 't') // just test by containing 't' - for NNNpt
+            }
+        } else if (c == 't') // just test by containing 't' - for NNNpt
             units = DimensionUnits.points; // "pt"
+        else if (c == '%')
+            units = DimensionUnits.percents;
+        else if (c == '.')
+            dotFound = true;
     }
     // TODO: convert points to pixels
     switch(units) {
@@ -295,6 +308,10 @@ static uint decodeDimension(string s) {
         // need to convert points to pixels
         value |= SIZE_IN_POINTS_FLAG;
         break;
+    case DimensionUnits.percents:
+        // need to convert percents
+        value = ((value * 100) + (afterPointValue * 100 / afterPointDivider)) | SIZE_IN_PERCENTS_FLAG;
+        break;
     default:
         break;
     }

src/dlangui/widgets/styles.d

@@ -15,6 +15,7 @@ import dlangui.widgets.styles;
 
 Recent changes:
      Dimensions like fontSize, padding, margins, min/max width and height can be specified in points, e.g. minWidth = "3pt" margins="1pt,2pt,1pt,2pt"
+     % for font size, based on parent font size, e.g. fontSize="120.5%" means parentStyle.fontSize * 120.5 / 100.0;
 
 Copyright: Vadim Lopatin, 2014
 License:   Boost License 1.0
@@ -443,9 +444,11 @@ class Style {
 
 	/// font size
 	@property int fontSize() const {
-        if (_fontSize != FONT_SIZE_UNSPECIFIED)
+        if (_fontSize != FONT_SIZE_UNSPECIFIED) {
+            if (_fontSize & SIZE_IN_PERCENTS_FLAG)
+                return parentStyle.fontSize * (_fontSize ^ SIZE_IN_PERCENTS_FLAG) / 10000;
             return toPixels(_fontSize);
-        else
+        } else
             return parentStyle.fontSize;
 	}
 
@@ -1237,7 +1240,7 @@ bool loadStyleAttributes(Style style, Element elem, bool allowStates) {
 	if ("fontFamily" in elem.tag.attr)
 		style.fontFamily = decodeFontFamily(elem.tag.attr["fontFamily"]);
 	if ("fontSize" in elem.tag.attr)
-		style.fontSize = cast(ushort)decodeDimension(elem.tag.attr["fontSize"]);
+		style.fontSize = cast(int)decodeDimension(elem.tag.attr["fontSize"]);
 	if ("layoutWidth" in elem.tag.attr)
 		style.layoutWidth = decodeLayoutDimension(elem.tag.attr["layoutWidth"]);
 	if ("layoutHeight" in elem.tag.attr)

views/res/theme_default.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <theme id="theme_default" 
-        fontSize="11pt" 
+        fontSize="9pt" 
         fontFace="Verdana,Arial,DejaVu Sans"
         fontFamily="SansSerif"
 	>
@@ -421,7 +421,7 @@
 
     <style id="SETTINGS_PAGE_TITLE"
         margins="4,4,4,14"
-	fontSize="11pt"
+	fontSize="120%"
 	layoutWeight="0"
         layoutWidth="FILL_PARENT"
     />