1 files changed, 99 insertions, 0 deletions
diff --git a/dom/canvas/WebGLContextUtils.h b/dom/canvas/WebGLContextUtils.h
new file mode 100644
index 000000000..5401fc878
--- /dev/null
+++ b/dom/canvas/WebGLContextUtils.h
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#ifndef WEBGL_CONTEXT_UTILS_H_
+#define WEBGL_CONTEXT_UTILS_H_
+
+#include "WebGLContext.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/dom/BindingUtils.h"
+
+#include "WebGLStrongTypes.h"
+
+namespace mozilla {
+
+// For use with the different texture calls, i.e.
+//   TexImage2D, CopyTex[Sub]Image2D, ...
+// that take a "target" parameter. This parameter is not always the same as
+// the texture binding location, like GL_TEXTURE_2D or GL_TEXTURE_CUBE_MAP.
+// For example, cube maps would pass GL_TEXTURE_CUBE_MAP_[POS|NEG]_[X|Y|Z]
+// instead of just GL_TEXTURE_CUBE_MAP.
+//
+// This function converts the texture image target to the texture target a.k.a.
+// binding location. The returned binding location can be used to check that
+// the currently bound texture is appropriate for this texImageTarget.
+//
+// Returns GL_NONE if passed an invalid texture image target
+TexTarget TexImageTargetToTexTarget(TexImageTarget texImageTarget);
+
+// Helper function to create a JS::Value from a C string
+JS::Value StringValue(JSContext* cx, const char* str, ErrorResult& rv);
+
+struct GLComponents
+{
+    unsigned char mComponents;
+
+    enum Components {
+        Red     = (1 << 0),
+        Green   = (1 << 1),
+        Blue    = (1 << 2),
+        Alpha   = (1 << 3),
+        Stencil = (1 << 4),
+        Depth   = (1 << 5),
+    };
+
+    GLComponents()
+        : mComponents(0)
+    {}
+
+    explicit GLComponents(TexInternalFormat format);
+
+    // Returns true iff other has all (or more) of
+    // the components present in this GLComponents
+    bool IsSubsetOf(const GLComponents& other) const;
+};
+
+template <typename WebGLObjectType>
+JS::Value
+WebGLContext::WebGLObjectAsJSValue(JSContext* cx, const WebGLObjectType* object,
+                                   ErrorResult& rv) const
+{
+    if (!object)
+        return JS::NullValue();
+
+    MOZ_ASSERT(this == object->mContext);
+    JS::Rooted<JS::Value> v(cx);
+    JS::Rooted<JSObject*> wrapper(cx, GetWrapper());
+    JSAutoCompartment ac(cx, wrapper);
+    if (!dom::GetOrCreateDOMReflector(cx, const_cast<WebGLObjectType*>(object), &v)) {
+        rv.Throw(NS_ERROR_FAILURE);
+        return JS::NullValue();
+    }
+    return v;
+}
+
+template <typename WebGLObjectType>
+JSObject*
+WebGLContext::WebGLObjectAsJSObject(JSContext* cx,
+                                    const WebGLObjectType* object,
+                                    ErrorResult& rv) const
+{
+    JS::Value v = WebGLObjectAsJSValue(cx, object, rv);
+    if (v.isNull())
+        return nullptr;
+
+    return &v.toObject();
+}
+
+/**
+ * Return the displayable name for the texture function that is the
+ * source for validation.
+ */
+const char* InfoFrom(WebGLTexImageFunc func, WebGLTexDimensions dims);
+
+} // namespace mozilla
+
+#endif // WEBGL_CONTEXT_UTILS_H_