perf: avoid memcpy while drawing canvas on canvas (#984)

Author: Brooooooklyn

.github/workflows/CI.yaml

@@ -448,7 +448,7 @@ jobs:
       fail-fast: false
       matrix:
         node: ['20', '22']
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
 
     steps:
       - uses: actions/checkout@v4
@@ -473,16 +473,7 @@ jobs:
         shell: bash
 
       - name: Install dependencies
-        run: |
-          yarn config set supportedArchitectures.cpu "arm64"
-          yarn config set supportedArchitectures.libc "glibc"
-          yarn install --immutable --mode=skip-build
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-        with:
-          platforms: arm64
-
-      - run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+        run: yarn install --immutable --mode=skip-build
 
       - name: Setup and run tests
         uses: addnab/docker-run-action@v3
@@ -506,7 +497,7 @@ jobs:
     needs:
       - build
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
 
     steps:
       - uses: actions/checkout@v4
@@ -536,13 +527,6 @@ jobs:
           yarn config set supportedArchitectures.libc "musl"
           yarn install --immutable --mode=skip-build
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-        with:
-          platforms: arm64
-
-      - run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
-
       - name: Setup and run tests
         uses: addnab/docker-run-action@v3
         with:

build.rs

@@ -164,7 +164,7 @@ fn main() {
               .cpp_set_stdlib("stdc++")
               .flag("-static")
               .include("/usr/arm-linux-gnueabihf/include")
-              .include(format!("/usr/arm-linux-gnueabihf/include/c++/8"));
+              .include("/usr/arm-linux-gnueabihf/include/c++/8");
             println!("cargo:rustc-link-lib=static=stdc++");
             println!("cargo:rustc-link-search=/usr/lib/gcc-cross/arm-linux-gnueabihf/8");
           }

skia-c/skia_c.cpp

@@ -293,14 +293,10 @@ extern "C"
 
   void skiac_surface_get_bitmap(skiac_surface *c_surface, skiac_bitmap_info *info)
   {
-    auto image = SURFACE_CAST->makeImageSnapshot();
-    auto bitmap = new SkBitmap();
-    auto image_info = image->imageInfo();
-    bitmap->allocPixels(image_info);
-    image->readPixels(image_info, bitmap->getPixels(), bitmap->rowBytes(), 0, 0);
-    info->bitmap = reinterpret_cast<skiac_bitmap *>(bitmap);
-    info->width = (size_t)image_info.width();
-    info->height = (size_t)image_info.height();
+    info->is_canvas = true;
+    info->bitmap = reinterpret_cast<skiac_bitmap *>(c_surface);
+    info->width = (size_t)SURFACE_CAST->width();
+    info->height = (size_t)SURFACE_CAST->height();
   }
 
   // Canvas
@@ -354,6 +350,7 @@ extern "C"
   void skiac_canvas_draw_image(
       skiac_canvas *c_canvas,
       skiac_bitmap *c_bitmap,
+      bool is_canvas,
       float sx,
       float sy,
       float s_width,
@@ -368,11 +365,19 @@ extern "C"
   {
     const auto src_rect = SkRect::MakeXYWH(sx, sy, s_width, s_height);
     const auto dst_rect = SkRect::MakeXYWH(dx, dy, d_width, d_height);
-    auto sk_image = SkImages::RasterFromBitmap(*BITMAP_CAST);
     auto fq = enable_smoothing ? filter_quality : 0;
     const auto sampling = SamplingOptionsFromFQ(fq);
     auto paint = reinterpret_cast<const SkPaint *>(c_paint);
-    CANVAS_CAST->drawImageRect(sk_image, src_rect, dst_rect, sampling, paint, SkCanvas::kFast_SrcRectConstraint);
+    if (is_canvas) {
+      auto srcSurface = reinterpret_cast<SkSurface *>(c_bitmap);
+      CANVAS_CAST->save();
+      CANVAS_CAST->translate(dx, dy);
+      CANVAS_CAST->clipRect(SkRect::MakeWH(d_width, d_height));
+      srcSurface->draw(CANVAS_CAST, -sx, -sy, sampling, paint);
+      CANVAS_CAST->restore();
+    } else {
+      CANVAS_CAST->drawImageRect(SkImages::RasterFromBitmap(*BITMAP_CAST), src_rect, dst_rect, sampling, paint, SkCanvas::kFast_SrcRectConstraint);
+    }
   }
 
   void skiac_canvas_draw_path(skiac_canvas *c_canvas, skiac_path *c_path, skiac_paint *c_paint)

skia-c/skia_c.hpp

@@ -224,6 +224,7 @@ struct skiac_bitmap_info
   skiac_bitmap *bitmap;
   int width;
   int height;
+  bool is_canvas;
 };
 
 struct skiac_string
@@ -294,6 +295,7 @@ extern "C"
   void skiac_canvas_draw_image(
       skiac_canvas *c_canvas,
       skiac_bitmap *c_bitmap,
+      bool is_canvas,
       float sx,
       float sy,
       float s_width,

src/ctx.rs

@@ -712,7 +712,6 @@ impl Context {
     d_width: f32,
     d_height: f32,
   ) -> Result<()> {
-    let bitmap = bitmap.0.bitmap;
     let mut paint: Paint = self.fill_paint()?;
     paint.set_alpha((self.state.global_alpha * 255.0).round() as u8);
     Self::render_canvas(

src/sk.rs

@@ -111,6 +111,7 @@ pub mod ffi {
     pub bitmap: *mut skiac_bitmap,
     pub width: i32,
     pub height: i32,
+    pub is_canvas: bool,
   }
 
   #[repr(C)]
@@ -373,6 +374,7 @@ pub mod ffi {
     pub fn skiac_canvas_draw_image(
       canvas: *mut skiac_canvas,
       bitmap: *mut skiac_bitmap,
+      is_image: bool,
       sx: f32,
       sy: f32,
       s_width: f32,
@@ -1822,6 +1824,7 @@ impl Surface {
       bitmap: ptr::null_mut(),
       width: 0,
       height: 0,
+      is_canvas: true,
     };
     unsafe { ffi::skiac_surface_get_bitmap(self.ptr, &mut bitmap_info) };
     Bitmap(bitmap_info)
@@ -2068,7 +2071,7 @@ impl Canvas {
 
   pub fn draw_image(
     &mut self,
-    image: *mut ffi::skiac_bitmap,
+    image: &Bitmap,
     sx: f32,
     sy: f32,
     s_width: f32,
@@ -2084,7 +2087,8 @@ impl Canvas {
     unsafe {
       ffi::skiac_canvas_draw_image(
         self.0,
-        image,
+        image.0.bitmap,
+        image.0.is_canvas,
         sx,
         sy,
         s_width,
@@ -3439,7 +3443,7 @@ impl Drop for ImageFilter {
 
 #[repr(transparent)]
 #[derive(Debug)]
-pub(crate) struct Bitmap(pub(crate) ffi::skiac_bitmap_info);
+pub struct Bitmap(pub(crate) ffi::skiac_bitmap_info);
 
 unsafe impl Send for Bitmap {}
 unsafe impl Sync for Bitmap {}
@@ -3450,6 +3454,7 @@ impl Bitmap {
       bitmap: ptr::null_mut(),
       width: 0,
       height: 0,
+      is_canvas: false,
     };
     unsafe {
       ffi::skiac_bitmap_make_from_buffer(ptr, size, &mut bitmap_info);
@@ -3467,6 +3472,7 @@ impl Bitmap {
       bitmap: ptr::null_mut(),
       width: 0,
       height: 0,
+      is_canvas: false,
     };
     unsafe {
       let is_valid = ffi::skiac_bitmap_make_from_svg(
@@ -3502,6 +3508,7 @@ impl Bitmap {
       bitmap: ptr::null_mut(),
       width: 0,
       height: 0,
+      is_canvas: false,
     };
     unsafe {
       ffi::skiac_bitmap_make_from_svg(
@@ -3545,14 +3552,17 @@ impl Bitmap {
       bitmap,
       width: row_bytes as i32,
       height: (size / row_bytes / 4) as i32,
+      is_canvas: false,
     })
   }
 }
 
 impl Drop for Bitmap {
   fn drop(&mut self) {
     unsafe {
-      ffi::skiac_bitmap_destroy(self.0.bitmap);
+      if !self.0.is_canvas {
+        ffi::skiac_bitmap_destroy(self.0.bitmap);
+      }
     }
   }
 }