implement field to specify if anti-aliasing is used

Author: jonaspleyer

plotters-bitmap/src/bitmap.rs

@@ -40,6 +40,7 @@ pub struct BitMapBackend<'a, P: PixelFormat = RGBPixel> {
     buffer: Buffer<'a>,
     /// Flag indicates if the bitmap has been saved
     saved: bool,
+    use_anti_aliasing: bool,
     _phantomdata: PhantomData<P>,
 }
 
@@ -57,6 +58,7 @@ impl<'a> BitMapBackend<'a, RGBPixel> {
             size: (w, h),
             buffer: Buffer::Owned(vec![0; Self::PIXEL_SIZE * (w * h) as usize]),
             saved: false,
+            use_anti_aliasing: true,
             _phantomdata: PhantomData,
         }
     }
@@ -85,6 +87,7 @@ impl<'a> BitMapBackend<'a, RGBPixel> {
             size: (w, h),
             buffer: Buffer::Owned(vec![0; Self::PIXEL_SIZE * (w * h) as usize]),
             saved: false,
+            use_anti_aliasing: true,
             _phantomdata: PhantomData,
         })
     }
@@ -128,6 +131,7 @@ impl<'a, P: PixelFormat> BitMapBackend<'a, P> {
             size: (w, h),
             buffer: Buffer::Borrowed(buf),
             saved: false,
+            use_anti_aliasing: true,
             _phantomdata: PhantomData,
         })
     }
@@ -137,6 +141,13 @@ impl<'a, P: PixelFormat> BitMapBackend<'a, P> {
         self.buffer.borrow_buffer()
     }
 
+    #[inline(always)]
+    pub fn anti_aliasing(self, use_anti_aliasing: bool) -> Self {
+        let mut s = self;
+        s.use_anti_aliasing = use_anti_aliasing;
+        s
+    }
+
     /// Split a bitmap backend vertically into several sub drawing area which allows
     /// multi-threading rendering.
     ///
@@ -334,6 +345,10 @@ impl<'a, P: PixelFormat> DrawingBackend for BitMapBackend<'a, P> {
 
         Ok(())
     }
+
+    fn use_anti_aliasing(&self) -> bool {
+        self.use_anti_aliasing
+    }
 }
 
 impl<P: PixelFormat> Drop for BitMapBackend<'_, P> {

plotters-svg/src/svg.rs

@@ -662,6 +662,10 @@ impl<'a> DrawingBackend for SVGBackend<'a> {
 
         Ok(())
     }
+
+    fn use_anti_aliasing(&self) -> bool {
+        true
+    }
 }
 
 impl Drop for SVGBackend<'_> {