Revert "Upgrade WebRender to e491e1ae637b2eed1e7195855d88357e5eb3ddf9 (#30323)"revert-webrender

This reverts commit a9d37cb85ac2c55fc630fccffe1ba60ff00f555b.

1 files changed, 238 insertions, 0 deletions

diff --git a/third_party/webrender/examples/frame_output.rs b/third_party/webrender/examples/frame_output.rs
new file mode 100644
index 00000000000..2cd612c9b4c
--- /dev/null
+++ b/third_party/webrender/examples/frame_output.rs
@@ -0,0 +1,238 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use euclid;
+use gleam;
+use glutin;
+use webrender;
+use winit;
+
+#[path = "common/boilerplate.rs"]
+mod boilerplate;
+
+use crate::boilerplate::{Example, HandyDandyRectBuilder};
+use euclid::Scale;
+use gleam::gl;
+use webrender::api::*;
+use webrender::api::units::*;
+
+
+// This example demonstrates using the frame output feature to copy
+// the output of a WR framebuffer to a custom texture.
+
+#[derive(Debug)]
+struct Document {
+    id: DocumentId,
+    pipeline_id: PipelineId,
+    content_rect: LayoutRect,
+    color: ColorF,
+}
+
+
+struct App {
+    external_image_key: Option<ImageKey>,
+    output_document: Option<Document>
+}
+
+struct OutputHandler {
+    texture_id: gl::GLuint
+}
+
+struct ExternalHandler {
+    texture_id: gl::GLuint
+}
+
+impl OutputImageHandler for OutputHandler {
+    fn lock(&mut self, _id: PipelineId) -> Option<(u32, FramebufferIntSize)> {
+        Some((self.texture_id, FramebufferIntSize::new(500, 500)))
+    }
+
+    fn unlock(&mut self, _id: PipelineId) {}
+}
+
+impl ExternalImageHandler for ExternalHandler {
+    fn lock(
+        &mut self,
+        _key: ExternalImageId,
+        _channel_index: u8,
+        _rendering: ImageRendering
+    ) -> ExternalImage {
+        ExternalImage {
+            uv: TexelRect::new(0.0, 0.0, 1.0, 1.0),
+            source: ExternalImageSource::NativeTexture(self.texture_id),
+        }
+    }
+    fn unlock(&mut self, _key: ExternalImageId, _channel_index: u8) {}
+}
+
+impl App {
+    fn init_output_document(
+        &mut self,
+        api: &mut RenderApi,
+        device_size: DeviceIntSize,
+        device_pixel_ratio: f32,
+    ) {
+        // Generate the external image key that will be used to render the output document to the root document.
+        self.external_image_key = Some(api.generate_image_key());
+
+        let pipeline_id = PipelineId(1, 0);
+        let layer = 1;
+        let color = ColorF::new(1., 1., 0., 1.);
+        let document_id = api.add_document(device_size, layer);
+        api.enable_frame_output(document_id, pipeline_id, true);
+        api.set_document_view(
+            document_id,
+            device_size.into(),
+            device_pixel_ratio,
+        );
+
+        let document = Document {
+            id: document_id,
+            pipeline_id,
+            content_rect: LayoutRect::new(
+                LayoutPoint::zero(),
+                device_size.to_f32() / Scale::new(device_pixel_ratio),
+            ),
+            color,
+        };
+
+        let mut txn = Transaction::new();
+
+        txn.add_image(
+            self.external_image_key.unwrap(),
+            ImageDescriptor::new(100, 100, ImageFormat::BGRA8, ImageDescriptorFlags::IS_OPAQUE),
+            ImageData::External(ExternalImageData {
+                id: ExternalImageId(0),
+                channel_index: 0,
+                image_type: ExternalImageType::TextureHandle(TextureTarget::Default),
+            }),
+            None,
+        );
+
+        let space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
+        let mut builder = DisplayListBuilder::new(
+            document.pipeline_id,
+            document.content_rect.size,
+        );
+
+        builder.push_simple_stacking_context(
+            document.content_rect.origin,
+            space_and_clip.spatial_id,
+            PrimitiveFlags::IS_BACKFACE_VISIBLE,
+        );
+
+        builder.push_rect(
+            &CommonItemProperties::new(document.content_rect, space_and_clip),
+            document.content_rect,
+            ColorF::new(1.0, 1.0, 0.0, 1.0)
+        );
+        builder.pop_stacking_context();
+
+        txn.set_root_pipeline(pipeline_id);
+        txn.set_display_list(
+            Epoch(0),
+            Some(document.color),
+            document.content_rect.size,
+            builder.finalize(),
+            true,
+        );
+        txn.generate_frame();
+        api.send_transaction(document.id, txn);
+        self.output_document = Some(document);
+    }
+}
+
+impl Example for App {
+    fn render(
+        &mut self,
+        api: &mut RenderApi,
+        builder: &mut DisplayListBuilder,
+        _txn: &mut Transaction,
+        device_size: DeviceIntSize,
+        pipeline_id: PipelineId,
+        _document_id: DocumentId,
+    ) {
+        if self.output_document.is_none() {
+            let device_pixel_ratio = device_size.width as f32 /
+                builder.content_size().width;
+            self.init_output_document(api, DeviceIntSize::new(200, 200), device_pixel_ratio);
+        }
+
+        let bounds = (100, 100).to(200, 200);
+        let space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
+
+        builder.push_simple_stacking_context(
+            bounds.origin,
+            space_and_clip.spatial_id,
+            PrimitiveFlags::IS_BACKFACE_VISIBLE,
+        );
+
+        builder.push_image(
+            &CommonItemProperties::new(bounds, space_and_clip),
+            bounds,
+            ImageRendering::Auto,
+            AlphaType::PremultipliedAlpha,
+            self.external_image_key.unwrap(),
+            ColorF::WHITE,
+        );
+
+        builder.pop_stacking_context();
+    }
+
+    fn get_image_handlers(
+        &mut self,
+        gl: &dyn gl::Gl,
+    ) -> (Option<Box<dyn ExternalImageHandler>>,
+          Option<Box<dyn OutputImageHandler>>) {
+        let texture_id = gl.gen_textures(1)[0];
+
+        gl.bind_texture(gl::TEXTURE_2D, texture_id);
+        gl.tex_parameter_i(
+            gl::TEXTURE_2D,
+            gl::TEXTURE_MAG_FILTER,
+            gl::LINEAR as gl::GLint,
+        );
+        gl.tex_parameter_i(
+            gl::TEXTURE_2D,
+            gl::TEXTURE_MIN_FILTER,
+            gl::LINEAR as gl::GLint,
+        );
+        gl.tex_parameter_i(
+            gl::TEXTURE_2D,
+            gl::TEXTURE_WRAP_S,
+            gl::CLAMP_TO_EDGE as gl::GLint,
+        );
+        gl.tex_parameter_i(
+            gl::TEXTURE_2D,
+            gl::TEXTURE_WRAP_T,
+            gl::CLAMP_TO_EDGE as gl::GLint,
+        );
+        gl.tex_image_2d(
+            gl::TEXTURE_2D,
+            0,
+            gl::RGBA as gl::GLint,
+            100,
+            100,
+            0,
+            gl::BGRA,
+            gl::UNSIGNED_BYTE,
+            None,
+        );
+        gl.bind_texture(gl::TEXTURE_2D, 0);
+
+        (
+            Some(Box::new(ExternalHandler { texture_id })),
+            Some(Box::new(OutputHandler { texture_id }))
+        )
+    }
+}
+
+fn main() {
+    let mut app = App {
+        external_image_key: None,
+        output_document: None
+    };
+
+    boilerplate::main_wrapper(&mut app, None);
+}