LibWeb: Add ImageData objects and implement 2D context putImageData()

An ImageData is a wrapper around a Bitmap wrapper around a
JS::Uint8ClampedArray.

Libraries/LibWeb/Bindings/ImageDataWrapper.cpp

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Function.h>
+#include <LibJS/Interpreter.h>
+#include <LibJS/Runtime/Error.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Uint8ClampedArray.h>
+#include <LibWeb/Bindings/ImageDataWrapper.h>
+#include <LibWeb/DOM/ImageData.h>
+
+namespace Web {
+namespace Bindings {
+
+ImageDataWrapper* wrap(JS::Heap& heap, ImageData& event)
+{
+    return static_cast<ImageDataWrapper*>(wrap_impl(heap, event));
+}
+
+ImageDataWrapper::ImageDataWrapper(ImageData& impl)
+    : Wrapper(*interpreter().global_object().object_prototype())
+    , m_impl(impl)
+{
+    put_native_property("width", width_getter, nullptr);
+    put_native_property("height", height_getter, nullptr);
+    put_native_property("data", data_getter, nullptr);
+}
+
+ImageDataWrapper::~ImageDataWrapper()
+{
+}
+
+static ImageData* impl_from(JS::Interpreter& interpreter)
+{
+    auto* this_object = interpreter.this_value().to_object(interpreter.heap());
+    if (!this_object) {
+        ASSERT_NOT_REACHED();
+        return nullptr;
+    }
+    if (StringView("ImageDataWrapper") != this_object->class_name()) {
+        interpreter.throw_exception<JS::TypeError>("That's not an ImageDataWrapper, bro.");
+        return nullptr;
+    }
+    return &static_cast<ImageDataWrapper*>(this_object)->impl();
+}
+
+JS::Value ImageDataWrapper::width_getter(JS::Interpreter& interpreter)
+{
+    auto* impl = impl_from(interpreter);
+    if (!impl)
+        return {};
+    return JS::Value(impl->width());
+}
+
+JS::Value ImageDataWrapper::height_getter(JS::Interpreter& interpreter)
+{
+    auto* impl = impl_from(interpreter);
+    if (!impl)
+        return {};
+    return JS::Value(impl->height());
+}
+
+JS::Value ImageDataWrapper::data_getter(JS::Interpreter& interpreter)
+{
+    auto* impl = impl_from(interpreter);
+    if (!impl)
+        return {};
+    return impl->data();
+}
+
+}
+}