add svg_read support (basic)

src/svg_luminance_source.rs

@@ -0,0 +1,85 @@
+use crate::{BufferedImageLuminanceSource, Exceptions, LuminanceSource};
+use image::{DynamicImage, RgbaImage};
+use resvg::{self, usvg::Options};
+
+pub struct SVGLuminanceSource(BufferedImageLuminanceSource);
+
+impl LuminanceSource for SVGLuminanceSource {
+    fn getRow(&self, y: usize) -> Vec<u8> {
+        self.0.getRow(y)
+    }
+
+    fn getMatrix(&self) -> Vec<u8> {
+        self.0.getMatrix()
+    }
+
+    fn getWidth(&self) -> usize {
+        self.0.getWidth()
+    }
+
+    fn getHeight(&self) -> usize {
+        self.0.getHeight()
+    }
+
+    fn invert(&mut self) {
+        self.0.invert()
+    }
+
+    fn isCropSupported(&self) -> bool {
+        self.0.isCropSupported()
+    }
+
+    fn crop(
+        &self,
+        left: usize,
+        top: usize,
+        width: usize,
+        height: usize,
+    ) -> Result<Box<dyn LuminanceSource>, Exceptions> {
+        self.0.crop(left, top, width, height)
+    }
+
+    fn isRotateSupported(&self) -> bool {
+        self.0.isRotateSupported()
+    }
+
+    fn rotateCounterClockwise(&self) -> Result<Box<dyn LuminanceSource>, Exceptions> {
+        self.0.rotateCounterClockwise()
+    }
+
+    fn rotateCounterClockwise45(&self) -> Result<Box<dyn LuminanceSource>, Exceptions> {
+        self.0.rotateCounterClockwise45()
+    }
+}
+
+impl SVGLuminanceSource {
+    pub fn new(svg_data: &[u8]) -> Result<Self, Exceptions> {
+        // Load the SVG file
+        let Ok(tree) = resvg::usvg::Tree::from_data(svg_data, &Options::default()) else {
+            return Err(Exceptions::FormatException(Some(format!("could not parse svg data: {}", "err"))));
+        };
+
+        let Some(mut pixmap) = resvg::tiny_skia::Pixmap::new(tree.size.width() as u32, tree.size.height() as u32) else {
+            return Err(Exceptions::FormatException(Some("could not create pixmap".to_owned())));
+        };
+
+        resvg::render(
+            &tree,
+            resvg::usvg::FitTo::Original,
+            resvg::tiny_skia::Transform::default(),
+            pixmap.as_mut(),
+        );
+
+        let Some(buffer) = RgbaImage::from_raw(tree.size.width() as u32, tree.size.height() as u32, pixmap.data().to_vec()) else {
+        return Err(Exceptions::FormatException(Some("could not create image buffer".to_owned())));
+    };
+
+        // let Ok(image) = image::load_from_memory_with_format(pixmap.data(), image::ImageFormat::Bmp)  else {
+        //     return Err(Exceptions::FormatException(Some("could not generate image".to_owned())));
+        // };
+
+        Ok(Self(BufferedImageLuminanceSource::new(DynamicImage::from(
+            buffer,
+        ))))
+    }
+}