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serenity/Libraries/LibWeb/Bindings/CanvasRenderingContext2DWrapper.cpp
Matthew Olsson dd08c992e8 LibJS: Simplify and normalize publicly-exposed Object functions 
Previously, the Object class had many different types of functions for
each action. For example: get_by_index, get(PropertyName),
get(FlyString). This is a bit verbose, so these methods have been
shortened to simply use the PropertyName structure. The methods then
internally call _by_index if necessary. Note that the _by_index
have been made private to enforce this change.

Secondly, a clear distinction has been made between "putting" and
"defining" an object property. "Putting" should mean modifying a
(potentially) already existing property. This is akin to doing "a.b =
'foo'".

This implies two things about put operations:
    - They will search the prototype chain for setters and call them, if
      necessary.
    - If no property exists with a particular key, the put operation
      should create a new property with the default attributes
      (configurable, writable, and enumerable).

In contrast, "defining" a property should completely overwrite any
existing value without calling setters (if that property is
configurable, of course).

Thus, all of the many JS objects have had any "put" calls changed to
"define_property" calls. Additionally, "put_native_function" and
"put_native_property" have had their "put" replaced with "define".

Finally, "put_own_property" has been made private, as all necessary
functionality should be exposed with the put and define_property
methods.
2020-05-27 13:17:35 +02:00

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/*
* 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/FlyString.h>
#include <AK/Function.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/PrimitiveString.h>
#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/HTMLCanvasElement.h>
#include <LibWeb/DOM/HTMLImageElement.h>
#include <LibWeb/DOM/ImageData.h>
namespace Web {
namespace Bindings {
CanvasRenderingContext2DWrapper* wrap(JS::Heap& heap, CanvasRenderingContext2D& impl)
{
return static_cast<CanvasRenderingContext2DWrapper*>(wrap_impl(heap, impl));
}
CanvasRenderingContext2DWrapper::CanvasRenderingContext2DWrapper(CanvasRenderingContext2D& impl)
: Wrapper(*interpreter().global_object().object_prototype())
, m_impl(impl)
{
define_native_function("fillRect", fill_rect, 4);
define_native_function("scale", scale, 2);
define_native_function("translate", translate, 2);
define_native_function("strokeRect", stroke_rect, 4);
define_native_function("drawImage", draw_image, 3);
define_native_function("beginPath", begin_path, 0);
define_native_function("closePath", close_path, 0);
define_native_function("stroke", stroke, 0);
define_native_function("fill", fill, 0);
define_native_function("moveTo", move_to, 2);
define_native_function("lineTo", line_to, 2);
define_native_function("quadraticCurveTo", quadratic_curve_to, 4);
define_native_function("createImageData", create_image_data, 1);
define_native_function("putImageData", put_image_data, 3);
define_native_property("fillStyle", fill_style_getter, fill_style_setter);
define_native_property("strokeStyle", stroke_style_getter, stroke_style_setter);
define_native_property("lineWidth", line_width_getter, line_width_setter);
define_native_property("canvas", canvas_getter, nullptr);
}
CanvasRenderingContext2DWrapper::~CanvasRenderingContext2DWrapper()
{
}
static CanvasRenderingContext2D* impl_from(JS::Interpreter& interpreter)
{
auto* this_object = interpreter.this_value().to_object(interpreter);
if (!this_object)
return nullptr;
// FIXME: Verify that it's a CanvasRenderingContext2DWrapper somehow!
return &static_cast<CanvasRenderingContext2DWrapper*>(this_object)->impl();
}
JS::Value CanvasRenderingContext2DWrapper::fill_rect(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
if (interpreter.argument_count() >= 4) {
auto x = interpreter.argument(0).to_double(interpreter);
if (interpreter.exception())
return {};
auto y = interpreter.argument(1).to_double(interpreter);
if (interpreter.exception())
return {};
auto width = interpreter.argument(2).to_double(interpreter);
if (interpreter.exception())
return {};
auto height = interpreter.argument(3).to_double(interpreter);
if (interpreter.exception())
return {};
impl->fill_rect(x, y, width, height);
}
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::stroke_rect(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
if (interpreter.argument_count() >= 4) {
auto x = interpreter.argument(0).to_double(interpreter);
if (interpreter.exception())
return {};
auto y = interpreter.argument(1).to_double(interpreter);
if (interpreter.exception())
return {};
auto width = interpreter.argument(2).to_double(interpreter);
if (interpreter.exception())
return {};
auto height = interpreter.argument(3).to_double(interpreter);
if (interpreter.exception())
return {};
impl->stroke_rect(x, y, width, height);
}
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::draw_image(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
if (interpreter.argument_count() < 3)
return interpreter.throw_exception<JS::TypeError>("drawImage() needs three arguments");
auto* image_argument = interpreter.argument(0).to_object(interpreter);
if (!image_argument)
return {};
if (StringView(image_argument->class_name()) != "HTMLImageElementWrapper")
return interpreter.throw_exception<JS::TypeError>(String::format("Image is not an HTMLImageElement, it's an %s", image_argument->class_name()));
auto x = interpreter.argument(1).to_double(interpreter);
if (interpreter.exception())
return {};
auto y = interpreter.argument(2).to_double(interpreter);
if (interpreter.exception())
return {};
impl->draw_image(static_cast<const HTMLImageElementWrapper&>(*image_argument).node(), x, y);
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::scale(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
if (interpreter.argument_count() >= 2) {
auto sx = interpreter.argument(0).to_number(interpreter);
if (interpreter.exception())
return {};
auto sy = interpreter.argument(1).to_number(interpreter);
if (interpreter.exception())
return {};
if (sx.is_finite_number() && sy.is_finite_number())
impl->scale(sx.as_double(), sy.as_double());
}
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::translate(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
if (interpreter.argument_count() >= 2) {
auto tx = interpreter.argument(0).to_number(interpreter);
if (interpreter.exception())
return {};
auto ty = interpreter.argument(1).to_number(interpreter);
if (interpreter.exception())
return {};
if (tx.is_finite_number() && ty.is_finite_number())
impl->translate(tx.as_double(), ty.as_double());
}
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::fill_style_getter(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
return JS::js_string(interpreter, impl->fill_style());
}
void CanvasRenderingContext2DWrapper::fill_style_setter(JS::Interpreter& interpreter, JS::Value value)
{
auto* impl = impl_from(interpreter);
if (!impl)
return;
auto string = value.to_string(interpreter);
if (interpreter.exception())
return;
impl->set_fill_style(string);
}
JS::Value CanvasRenderingContext2DWrapper::stroke_style_getter(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
return JS::js_string(interpreter, impl->stroke_style());
}
void CanvasRenderingContext2DWrapper::stroke_style_setter(JS::Interpreter& interpreter, JS::Value value)
{
auto* impl = impl_from(interpreter);
if (!impl)
return;
auto string = value.to_string(interpreter);
if (interpreter.exception())
return;
impl->set_stroke_style(string);
}
JS::Value CanvasRenderingContext2DWrapper::line_width_getter(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
return JS::Value(impl->line_width());
}
void CanvasRenderingContext2DWrapper::line_width_setter(JS::Interpreter& interpreter, JS::Value value)
{
auto* impl = impl_from(interpreter);
if (!impl)
return;
auto line_width = value.to_double(interpreter);
if (interpreter.exception())
return;
impl->set_line_width(line_width);
}
JS::Value CanvasRenderingContext2DWrapper::begin_path(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
impl->begin_path();
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::close_path(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
impl->close_path();
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::stroke(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
impl->stroke();
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::fill(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto winding = Gfx::Painter::WindingRule::Nonzero;
if (interpreter.argument_count() == 1) {
auto arg0 = interpreter.argument(0);
if (arg0.is_string()) {
const auto& winding_name = arg0.as_string().string();
if (winding_name == "evenodd") {
winding = Gfx::Painter::WindingRule::EvenOdd;
} else if (winding_name != "nonzero") {
return interpreter.throw_exception<JS::TypeError>("fill winding rule must be either 'nonzero' or 'evenodd'");
}
} else {
return interpreter.throw_exception<JS::TypeError>("fill called with non-string");
}
} else {
// FIXME: Path2D object
return JS::js_undefined();
}
impl->fill(winding);
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::move_to(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto x = interpreter.argument(0).to_double(interpreter);
if (interpreter.exception())
return {};
auto y = interpreter.argument(1).to_double(interpreter);
if (interpreter.exception())
return {};
impl->move_to(x, y);
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::line_to(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto x = interpreter.argument(0).to_double(interpreter);
if (interpreter.exception())
return {};
auto y = interpreter.argument(1).to_double(interpreter);
if (interpreter.exception())
return {};
impl->line_to(x, y);
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::quadratic_curve_to(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto cx = interpreter.argument(0).to_double(interpreter);
if (interpreter.exception())
return {};
auto cy = interpreter.argument(1).to_double(interpreter);
if (interpreter.exception())
return {};
auto x = interpreter.argument(2).to_double(interpreter);
if (interpreter.exception())
return {};
auto y = interpreter.argument(3).to_double(interpreter);
if (interpreter.exception())
return {};
impl->quadratic_curve_to(cx, cy, x, y);
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::create_image_data(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto width = interpreter.argument(0).to_i32(interpreter);
if (interpreter.exception())
return {};
auto height = interpreter.argument(1).to_i32(interpreter);
if (interpreter.exception())
return {};
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);
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(interpreter);
if (interpreter.exception())
return {};
auto y = interpreter.argument(2).to_double(interpreter);
if (interpreter.exception())
return {};
impl->put_image_data(image_data, x, y);
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::canvas_getter(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto* element = impl->element();
if (!element)
return JS::js_null();
return wrap(interpreter.heap(), *element);
}
}
}
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