1 files changed, 98 insertions, 0 deletions
diff --git a/dom/canvas/WebGLActiveInfo.h b/dom/canvas/WebGLActiveInfo.h
new file mode 100644
index 000000000..4a3c81758
--- /dev/null
+++ b/dom/canvas/WebGLActiveInfo.h
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 4; 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_ACTIVE_INFO_H_
+#define WEBGL_ACTIVE_INFO_H_
+
+#include "GLDefs.h"
+#include "mozilla/Attributes.h"
+#include "nsCycleCollectionParticipant.h" // NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS
+#include "nsISupportsImpl.h" // NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING
+#include "nsString.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+
+class WebGLContext;
+
+class WebGLActiveInfo final
+    : public nsWrapperCache
+{
+public:
+    NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(WebGLActiveInfo)
+    NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(WebGLActiveInfo)
+
+    virtual JSObject* WrapObject(JSContext* js, JS::Handle<JSObject*> givenProto) override;
+
+    WebGLContext* GetParentObject() const {
+        return mWebGL;
+    }
+
+    WebGLContext* const mWebGL;
+
+    // ActiveInfo state:
+    const uint32_t mElemCount; // `size`
+    const GLenum mElemType; // `type`
+    const nsCString mBaseUserName; // `name`, but ASCII, and without any final "[0]".
+
+    // Not actually part of ActiveInfo:
+    const bool mIsArray;
+    const uint8_t mElemSize;
+    const nsCString mBaseMappedName; // Without any final "[0]".
+
+    bool IsSampler() const;
+
+    WebGLActiveInfo(WebGLContext* webgl, GLint elemCount, GLenum elemType, bool isArray,
+                    const nsACString& baseUserName, const nsACString& baseMappedName);
+
+    /* GLES 2.0.25, p33:
+     *   This command will return as much information about active
+     *   attributes as possible. If no information is available, length will
+     *   be set to zero and name will be an empty string. This situation
+     *   could arise if GetActiveAttrib is issued after a failed link.
+     *
+     * It's the same for GetActiveUniform.
+     */
+    static WebGLActiveInfo* CreateInvalid(WebGLContext* webgl) {
+        return new WebGLActiveInfo(webgl);
+    }
+
+    // WebIDL attributes
+    GLint Size() const {
+        return mElemCount;
+    }
+
+    GLenum Type() const {
+        return mElemType;
+    }
+
+    void GetName(nsString& retval) const {
+        CopyASCIItoUTF16(mBaseUserName, retval);
+        if (mIsArray)
+            retval.AppendLiteral("[0]");
+    }
+
+private:
+    explicit WebGLActiveInfo(WebGLContext* webgl)
+        : mWebGL(webgl)
+        , mElemCount(0)
+        , mElemType(0)
+        , mBaseUserName("")
+        , mIsArray(false)
+        , mElemSize(0)
+        , mBaseMappedName("")
+    { }
+
+    // Private destructor, to discourage deletion outside of Release():
+    ~WebGLActiveInfo() { }
+};
+
+//////////
+
+bool IsElemTypeSampler(GLenum elemType);
+
+} // namespace mozilla
+
+#endif // WEBGL_ACTIVE_INFO_H_