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Auto merge of #232 - jdm:egl_linux, r=glennw
Support EGL on non-Android Linux. Rebase and squash of #220. <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.svg" height="40" alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/rust-layers/232) <!-- Reviewable:end -->
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| // Copyright 2015 The Servo Project Developers. See the COPYRIGHT | ||
| // file at the top-level directory of this distribution. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
| // option. This file may not be copied, modified, or distributed | ||
| // except according to those terms. | ||
|
|
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| //! Implementation of cross-process surfaces implementing EGL surface. | ||
| use texturegl::Texture; | ||
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| use egl::eglext::EGLImageKHR; | ||
| use euclid::size::Size2D; | ||
| use gleam::gl::{TEXTURE_2D, TexImage2D, UNSIGNED_BYTE}; | ||
| use skia::gl_context::GLContext; | ||
| use skia::gl_rasterization_context::GLRasterizationContext; | ||
| use std::iter::repeat; | ||
| use std::os::raw::c_void; | ||
| use std::sync::Arc; | ||
| use std::vec::Vec; | ||
|
|
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| use gleam::gl; | ||
|
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| #[cfg(target_os = "linux")] | ||
| const GL_FORMAT_BGRA: gl::GLuint = gl::BGRA; | ||
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| #[cfg(any(target_os = "android", target_os = "gonk"))] | ||
| const GL_FORMAT_BGRA: gl::GLuint = gl::BGRA_EXT; | ||
|
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| #[cfg(target_os="linux")] | ||
| pub use platform::linux::surface::NativeDisplay; | ||
|
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| #[cfg(target_os="android")] | ||
| pub use platform::android::surface::NativeDisplay; | ||
|
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| pub struct EGLImageNativeSurface { | ||
| /// An EGLImage for the case of GPU rendering. | ||
| image: Option<EGLImageKHR>, | ||
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| /// A heap-allocated bitmap for the case of CPU rendering. | ||
| bitmap: Option<Vec<u8>>, | ||
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| /// Whether this pixmap will leak if the destructor runs. This is for debugging purposes. | ||
| will_leak: bool, | ||
|
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| /// The size of this surface. | ||
| pub size: Size2D<i32>, | ||
| } | ||
|
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| unsafe impl Send for EGLImageNativeSurface {} | ||
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| impl EGLImageNativeSurface { | ||
| pub fn new(_: &NativeDisplay, size: Size2D<i32>) -> EGLImageNativeSurface { | ||
| let len = size.width * size.height * 4; | ||
| let bitmap: Vec<u8> = repeat(0).take(len as usize).collect(); | ||
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| EGLImageNativeSurface { | ||
| image: None, | ||
| bitmap: Some(bitmap), | ||
| will_leak: true, | ||
| size: size, | ||
| } | ||
| } | ||
|
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| /// This may only be called on the compositor side. | ||
| pub fn bind_to_texture(&self, _: &NativeDisplay, texture: &Texture) { | ||
| let _bound = texture.bind(); | ||
| match self.image { | ||
| None => match self.bitmap { | ||
| Some(ref bitmap) => { | ||
| let data = bitmap.as_ptr() as *const c_void; | ||
| unsafe { | ||
| TexImage2D(TEXTURE_2D, | ||
| 0, | ||
| GL_FORMAT_BGRA as i32, | ||
| self.size.width as i32, | ||
| self.size.height as i32, | ||
| 0, | ||
| GL_FORMAT_BGRA as u32, | ||
| UNSIGNED_BYTE, | ||
| data); | ||
| } | ||
| } | ||
| None => { | ||
| debug!("Cannot bind the buffer(CPU rendering), there is no bitmap"); | ||
| } | ||
| }, | ||
| Some(_image_khr) => { | ||
| panic!("TODO: Support GPU rasterizer path on EGL"); | ||
| } | ||
| } | ||
| } | ||
|
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| /// This may only be called on the painting side. | ||
| pub fn upload(&mut self, _: &NativeDisplay, data: &[u8]) { | ||
| match self.bitmap { | ||
| Some(ref mut bitmap) => { | ||
| bitmap.clear(); | ||
| bitmap.extend_from_slice(data); | ||
| } | ||
| None => { | ||
| debug!("Cannot upload the buffer(CPU rendering), there is no bitmap"); | ||
| } | ||
| } | ||
| } | ||
|
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| pub fn get_id(&self) -> isize { | ||
| match self.image { | ||
| None => 0, | ||
| Some(image_khr) => image_khr as isize, | ||
| } | ||
| } | ||
|
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| pub fn destroy(&mut self, _graphics_context: &NativeDisplay) { | ||
| if self.image.is_some() { | ||
| panic!("TODO: Support GPU rendering path on Android"); | ||
| } | ||
| self.mark_wont_leak() | ||
| } | ||
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| pub fn mark_will_leak(&mut self) { | ||
| self.will_leak = true | ||
| } | ||
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| pub fn mark_wont_leak(&mut self) { | ||
| self.will_leak = false | ||
| } | ||
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| pub fn gl_rasterization_context(&mut self, | ||
| _gl_context: Arc<GLContext>) | ||
| -> Option<GLRasterizationContext> { | ||
| panic!("TODO: Support GL context on EGL"); | ||
| } | ||
| } |
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