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

Browse source 
An ImageData is a wrapper around a Bitmap wrapper around a
JS::Uint8ClampedArray.
This commit is contained in:
Andreas Kling 2020-04-21 23:49:51 +02:00
parent 54133c683d
commit 2d4c91df8e
10 changed files with 359 additions and 0 deletions
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37
Libraries/LibWeb/Bindings/CanvasRenderingContext2DWrapper.cpp
View file

@ -33,8 +33,10 @@
#include <LibJS/Runtime/Value.h>
#include <LibWeb/Bindings/CanvasRenderingContext2DWrapper.h>
#include <LibWeb/Bindings/HTMLImageElementWrapper.h>
#include <LibWeb/Bindings/ImageDataWrapper.h>
#include <LibWeb/DOM/CanvasRenderingContext2D.h>
#include <LibWeb/DOM/HTMLImageElement.h>
#include <LibWeb/DOM/ImageData.h>
namespace Web {
namespace Bindings {
@ -62,6 +64,9 @@ CanvasRenderingContext2DWrapper::CanvasRenderingContext2DWrapper(CanvasRendering
put_native_function("moveTo", move_to, 0);
put_native_function("lineTo", line_to, 0);
put_native_function("createImageData", create_image_data, 2);
put_native_function("putImageData", put_image_data, 3);
put_native_property("lineWidth", line_width_getter, line_width_setter);
}
@ -235,5 +240,37 @@ JS::Value CanvasRenderingContext2DWrapper::line_to(JS::Interpreter& interpreter)
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::create_image_data(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
i32 width = interpreter.argument(0).to_i32();
i32 height = interpreter.argument(1).to_i32();
auto image_data = impl->create_image_data(interpreter.global_object(), width, height);
return wrap(interpreter.heap(), *image_data);
}
JS::Value CanvasRenderingContext2DWrapper::put_image_data(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto* image_data_object = interpreter.argument(0).to_object(interpreter.heap());
if (!image_data_object)
return {};
if (StringView(image_data_object->class_name()) != "ImageDataWrapper") {
return interpreter.throw_exception<JS::TypeError>("putImageData called with non-ImageData");
}
auto& image_data = static_cast<ImageDataWrapper*>(image_data_object)->impl();
auto x = interpreter.argument(1).to_double();
auto y = interpreter.argument(2).to_double();
impl->put_image_data(image_data, x, y);
return JS::js_undefined();
}
}
}

3
Libraries/LibWeb/Bindings/CanvasRenderingContext2DWrapper.h
View file

@ -59,6 +59,9 @@ private:
static JS::Value move_to(JS::Interpreter&);
static JS::Value line_to(JS::Interpreter&);
static JS::Value create_image_data(JS::Interpreter&);
static JS::Value put_image_data(JS::Interpreter&);
NonnullRefPtr<CanvasRenderingContext2D> m_impl;
};

95
Libraries/LibWeb/Bindings/ImageDataWrapper.cpp Normal file
View file

@ -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();
}
}
}

55
Libraries/LibWeb/Bindings/ImageDataWrapper.h Normal file
View file

@ -0,0 +1,55 @@
/*
* 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.
*/
#pragma once
#include <LibWeb/Bindings/Wrapper.h>
namespace Web {
namespace Bindings {
class ImageDataWrapper : public Wrapper {
public:
explicit ImageDataWrapper(ImageData&);
virtual ~ImageDataWrapper() override;
ImageData& impl() { return m_impl; }
const ImageData& impl() const { return m_impl; }
private:
virtual const char* class_name() const override { return "ImageDataWrapper"; }
static JS::Value width_getter(JS::Interpreter&);
static JS::Value height_getter(JS::Interpreter&);
static JS::Value data_getter(JS::Interpreter&);
NonnullRefPtr<ImageData> m_impl;
};
ImageDataWrapper* wrap(JS::Heap&, ImageData&);
}
}