56 lines
2.2 KiB
Rust
56 lines
2.2 KiB
Rust
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use crate::{GraphicsContextImpl, SoftBufferError};
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use raw_window_handle::{HasRawWindowHandle, AppKitHandle};
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use objc::runtime::Object;
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use core_graphics::base::{kCGBitmapByteOrder32Little, kCGImageAlphaNoneSkipFirst, kCGRenderingIntentDefault};
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use core_graphics::color_space::CGColorSpace;
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use core_graphics::context::CGContext;
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use core_graphics::data_provider::CGDataProvider;
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use core_graphics::geometry::{CGPoint, CGSize, CGRect};
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use core_graphics::image::CGImage;
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use core_graphics::sys;
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pub struct CGImpl;
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impl CGImpl {
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pub unsafe fn new<W: HasRawWindowHandle>(handle: AppKitHandle) -> Result<Self, SoftBufferError<W>> {
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let window = handle.ns_window as *mut Object;
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let cls = class!(NSGraphicsContext);
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let graphics_context: *mut Object = msg_send![cls, graphicsContextWithWindow:window];
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if graphics_context.is_null() {
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return Err(SoftBufferError::PlatformError(Some("Graphics context is null".into()), None));
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}
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let _: () = msg_send![cls, setCurrentContext:graphics_context];
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Ok(Self)
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}
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}
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impl GraphicsContextImpl for CGImpl {
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unsafe fn set_buffer(&mut self, buffer: &[u32], width: u16, height: u16) {
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let cls = class!(NSGraphicsContext);
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let graphics_context: *mut Object = msg_send![cls, currentContext];
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let context_ptr: *mut sys::CGContext = msg_send![graphics_context, CGContext];
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let context = CGContext::from_existing_context_ptr(context_ptr);
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let color_space = CGColorSpace::create_device_rgb();
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let slice = std::slice::from_raw_parts(
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buffer.as_ptr() as *const u8,
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buffer.len() * 4);
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let data_provider = CGDataProvider::from_slice(slice);
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let image = CGImage::new(
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width as usize,
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height as usize,
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8,
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32,
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(width * 4) as usize,
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&color_space,
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kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst,
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&data_provider,
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false,
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kCGRenderingIntentDefault,
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);
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let origin = CGPoint { x: 0f64, y: 0f64 };
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let size = CGSize { width: width as f64, height: height as f64 };
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let rect = CGRect { origin, size };
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context.draw_image(rect, &image);
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}
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}
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