fix DrawBuf.fill behavior - apply clipping rectangle

examples/example1/example1.visualdproj

@@ -70,11 +70,11 @@
   <doXGeneration>1</doXGeneration>
   <xfilename>$(IntDir)\$(TargetName).json</xfilename>
   <debuglevel>0</debuglevel>
-  <debugids />
+  <debugids>DebugFocus FontResources</debugids>
   <versionlevel>0</versionlevel>
   <versionids>EmbedStandardResources Unicode  USE_FREETYPE</versionids>
   <dump_source>0</dump_source>
-  <mapverbosity>3</mapverbosity>
+  <mapverbosity>0</mapverbosity>
   <createImplib>0</createImplib>
   <defaultlibname />
   <debuglibname />
@@ -90,7 +90,7 @@
   <objfiles />
   <linkswitches />
   <libfiles>dlangui.lib phobos.lib ole32.lib kernel32.lib user32.lib comctl32.lib comdlg32.lib shell32.lib</libfiles>
-  <libpaths>../../Debug ../../../DerelictOpenGL3/source</libpaths>
+  <libpaths>../../Debug</libpaths>
   <deffile />
   <resfile />
   <exefile>$(OutDir)\$(ProjectName).exe</exefile>

examples/example1/src/example1.d

@@ -190,6 +190,7 @@ extern (C) int UIAppMain(string[] args) {
 
     // always use trace, even for release builds
     Log.setLogLevel(LogLevel.Trace);
+	Log.setFileLogger(std.stdio.File("ui.log", "w"));
 
     // resource directory search paths
     // not required if only embedded resources are used
@@ -875,6 +876,7 @@ void main()
 		CanvasWidget canvas = new CanvasWidget("canvas");
 		canvas.layoutWidth(FILL_PARENT).layoutHeight(FILL_PARENT);
 		canvas.onDrawListener = delegate(CanvasWidget canvas, DrawBuf buf, Rect rc) {
+            Log.w("canvas.onDrawListener clipRect=" ~ to!string(buf.clipRect));
 			buf.fill(0xFFFFFF);
 			int x = rc.left;
 			int y = rc.top;

src/dlangui/graphics/drawbuf.d

@@ -21,7 +21,6 @@ public import dlangui.core.types;
 import dlangui.core.logger;
 import dlangui.graphics.colors;
 
-
 /**
  * 9-patch image scaling information (see Android documentation).
  *
@@ -120,6 +119,9 @@ class DrawBuf : RefCountedObject {
     void resetClipping() {
         _clipRect = Rect(0, 0, width, height);
     }
+    @property bool hasClipping() {
+        return _clipRect.left != 0 || _clipRect.top != 0 || _clipRect.right != width || _clipRect.bottom != height;
+    }
     /// returns clipping rectangle, when clipRect.isEmpty == true -- means no clipping.
     @property ref Rect clipRect() { return _clipRect; }
     /// returns clipping rectangle, or (0,0,dx,dy) when no clipping.
@@ -736,6 +738,10 @@ class GrayDrawBuf : DrawBuf {
         resetClipping();
     }
     override void fill(uint color) {
+        if (hasClipping) {
+            fillRect(_clipRect, color);
+            return;
+        }
         int len = _dx * _dy;
         ubyte * p = _buf.ptr;
         ubyte cl = rgbToGray(color);
@@ -961,6 +967,10 @@ class ColorDrawBuf : ColorDrawBufBase {
         resetClipping();
     }
     override void fill(uint color) {
+        if (hasClipping) {
+            fillRect(_clipRect, color);
+            return;
+        }
         int len = _dx * _dy;
         uint * p = _buf.ptr;
         for (int i = 0; i < len; i++)

src/dlangui/graphics/gldrawbuf.d

@@ -90,6 +90,10 @@ class GLDrawBuf : DrawBuf, GLConfigCallback {
 
     /// fill the whole buffer with solid color (no clipping applied)
     override void fill(uint color) {
+        if (hasClipping) {
+            fillRect(_clipRect, color);
+            return;
+        }
         assert(_scene !is null);
         _scene.add(new SolidRectSceneItem(Rect(0, 0, _dx, _dy), applyAlpha(color)));
     }

src/dlangui/platforms/windows/win32drawbuf.d

@@ -149,6 +149,10 @@ class Win32ColorDrawBuf : ColorDrawBufBase {
     }
     /// fill with solid color
     override void fill(uint color) {
+        if (hasClipping) {
+            fillRect(_clipRect, color);
+            return;
+        }
         int len = _dx * _dy;
         //for (int i = 0; i < len; i++)
         //    _pixels[i] = color;