Add support for WebGL2 ReadPixels functions

Adds support for the new ReadPixels functions introduced with WebGL2
and the relevant PixelStorei parameters.

Reference: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.10

1 files changed, 6 insertions, 2 deletions

diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 74fd8068a72..85930cd3529 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -380,7 +380,7 @@ impl WebGLRenderingContext {
     //
     // The WebGL spec mentions a couple more operations that trigger
     // this: clear() and getParameter(IMPLEMENTATION_COLOR_READ_*).
-    fn validate_framebuffer(&self) -> WebGLResult<()> {
+    pub fn validate_framebuffer(&self) -> WebGLResult<()> {
         match self.bound_framebuffer.get() {
             Some(fb) => match fb.check_status_for_rendering() {
                 CompleteForRendering::Complete => Ok(()),
@@ -481,7 +481,7 @@ impl WebGLRenderingContext {
         self.send_command(WebGLCommand::VertexAttrib(indx, x, y, z, w));
     }
 
-    fn get_current_framebuffer_size(&self) -> Option<(i32, i32)> {
+    pub fn get_current_framebuffer_size(&self) -> Option<(i32, i32)> {
         match self.bound_framebuffer.get() {
             Some(fb) => return fb.size(),
 
@@ -490,6 +490,10 @@ impl WebGLRenderingContext {
         }
     }
 
+    pub fn get_texture_packing_alignment(&self) -> u8 {
+        self.texture_packing_alignment.get()
+    }
+
     // LINEAR filtering may be forbidden when using WebGL extensions.
     // https://www.khronos.org/registry/webgl/extensions/OES_texture_float_linear/
     fn validate_filterable_texture(