[wip] Use piet-coregraphics backend

This is currently just for testing, won't be able to use this
until we do a release of piet.

docs/book_examples/src/custom_widgets_md.rs

@@ -28,7 +28,7 @@ fn sized_swatch() -> impl Widget<Color> {
 // ANCHOR: background_label
 fn background_label() -> impl Widget<Color> {
     Label::dynamic(|color: &Color, _| {
-        let (r, g, b, _) = color.as_rgba_u8();
+        let (r, g, b, _) = color.as_rgba8();
         format!("#{:X}{:X}{:X}", r, g, b)
     })
     .background(make_color_swatch())

druid-shell/Cargo.toml

@@ -16,13 +16,13 @@ x11 = ["xcb", "cairo-sys-rs"]
 default-target = "x86_64-pc-windows-msvc"
 
 [dependencies]
-piet-common = "0.0.12"
+piet-common = "0.0.13"
 log = "0.4.8"
 lazy_static = "1.0"
 time = "0.2.7"
 cfg-if = "0.1.10"
 # NOTE: if changing, ensure version is compatible with the version in piet
-kurbo = "0.5.11"
+kurbo = "0.6.0"
 # NOTE: This defaults to mimicking std::time on non-wasm targets
 instant = { version = "0.1", features = [ "wasm-bindgen" ] }
 
@@ -38,7 +38,7 @@ gtk-sys = { version = "0.9.0", optional = true }
 xcb = { version = "0.9.0", features = ["thread", "xlib_xcb", "randr"], optional = true }
 
 [dev-dependencies]
-piet-common = {version = "0.0.12", features = ["png"]}
+piet-common = {version = "0.0.13", features = ["png"]}
 
 [target.'cfg(target_os="windows")'.dependencies]
 wio = "0.2"
@@ -50,7 +50,8 @@ features = ["d2d1_1", "dwrite", "winbase", "libloaderapi", "errhandlingapi", "wi
 [target.'cfg(target_os="macos")'.dependencies]
 cocoa = "0.20.0"
 objc = "0.2.5"
-cairo-rs = { version = "0.8.1", default_features = false }
+core-graphics = "0.19"
+foreign-types = "0.3.2"
 
 # TODO(x11/dependencies): only use feature "xcb" if using XCB
 [target.'cfg(target_os="linux")'.dependencies]

druid-shell/examples/invalidate.rs

@@ -32,7 +32,7 @@ struct InvalidateTest {
 impl InvalidateTest {
     fn update_color_and_rect(&mut self) {
         let time_since_start = (Instant::now() - self.start_time).as_millis();
-        let (r, g, b, _) = self.color.as_rgba_u8();
+        let (r, g, b, _) = self.color.as_rgba8();
         self.color = match (time_since_start % 2, time_since_start % 3) {
             (0, _) => Color::rgb8(r.wrapping_add(10), g, b),
             (_, 0) => Color::rgb8(r, g.wrapping_add(10), b),

druid-shell/src/platform/mac/window.rs

@@ -31,15 +31,15 @@ use cocoa::base::{id, nil, BOOL, NO, YES};
 use cocoa::foundation::{
     NSAutoreleasePool, NSInteger, NSPoint, NSRect, NSSize, NSString, NSUInteger,
 };
+use core_graphics::context::CGContextRef;
+use foreign_types::ForeignTypeRef;
 use lazy_static::lazy_static;
+use log::{error, info};
 use objc::declare::ClassDecl;
 use objc::rc::WeakPtr;
 use objc::runtime::{Class, Object, Sel};
 use objc::{class, msg_send, sel, sel_impl};
 
-use cairo::{Context, QuartzSurface};
-use log::{error, info};
-
 use crate::kurbo::{Point, Rect, Size, Vec2};
 use crate::piet::{Piet, RenderContext};
 
@@ -537,23 +537,17 @@ extern "C" fn mods_changed(this: &mut Object, _: Sel, nsevent: id) {
 extern "C" fn draw_rect(this: &mut Object, _: Sel, dirtyRect: NSRect) {
     unsafe {
         let context: id = msg_send![class![NSGraphicsContext], currentContext];
-        // TODO: probably should use a better type than void pointer, but it's not obvious what's best.
-        // cairo_sys::CGContextRef would be better documentation-wise, but it's a type alias.
-        let cgcontext: *mut c_void = msg_send![context, CGContext];
-        // TODO: use width and height from view size
-        let frame = NSView::frame(this as *mut _);
-        let width = frame.size.width as u32;
-        let height = frame.size.height as u32;
+        //FIXME: when core_graphics is at 0.20, we should be able to use
+        //core_graphics::sys::CGContextRef as our pointer type.
+        let cgcontext_ptr: *mut <CGContextRef as ForeignTypeRef>::CType =
+            msg_send![context, CGContext];
+        let cgcontext_ref = CGContextRef::from_ptr_mut(cgcontext_ptr);
+
         let rect = Rect::from_origin_size(
             (dirtyRect.origin.x, dirtyRect.origin.y),
             (dirtyRect.size.width, dirtyRect.size.height),
         );
-        let cairo_surface =
-            QuartzSurface::create_for_cg_context(cgcontext, width, height).expect("cairo surface");
-        let mut cairo_ctx = Context::new(&cairo_surface);
-        cairo_ctx.set_source_rgb(0.0, 0.5, 0.0);
-        cairo_ctx.paint();
-        let mut piet_ctx = Piet::new(&mut cairo_ctx);
+        let mut piet_ctx = Piet::new_y_down(cgcontext_ref);
         let view_state: *mut c_void = *this.get_ivar("viewState");
         let view_state = &mut *(view_state as *mut ViewState);
         let anim = (*view_state).handler.paint(&mut piet_ctx, rect);