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LibWeb: Add CanvasRenderingContext2D.drawImage(image, x, y)

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This function allows you to draw a loaded <img> element into a canvas.
This commit is contained in:
Andreas Kling 2020-04-14 20:38:44 +02:00
parent 370befbf52
commit 067ea5a2e0
4 changed files with 47 additions and 0 deletions
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26
Libraries/LibWeb/Bindings/CanvasRenderingContext2DWrapper.cpp
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@ -27,10 +27,13 @@
#include <AK/FlyString.h>
#include <AK/Function.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Value.h>
#include <LibWeb/Bindings/CanvasRenderingContext2DWrapper.h>
#include <LibWeb/Bindings/HTMLImageElementWrapper.h>
#include <LibWeb/DOM/CanvasRenderingContext2D.h>
#include <LibWeb/DOM/HTMLImageElement.h>
namespace Web {
namespace Bindings {
@ -49,6 +52,7 @@ CanvasRenderingContext2DWrapper::CanvasRenderingContext2DWrapper(CanvasRendering
put_native_function("translate", translate, 2);
put_native_property("strokeStyle", stroke_style_getter, stroke_style_setter);
put_native_function("strokeRect", stroke_rect, 4);
put_native_function("drawImage", draw_image, 3);
}
CanvasRenderingContext2DWrapper::~CanvasRenderingContext2DWrapper()
@ -86,6 +90,28 @@ JS::Value CanvasRenderingContext2DWrapper::stroke_rect(JS::Interpreter& interpre
return JS::js_undefined();
}
JS::Value CanvasRenderingContext2DWrapper::draw_image(JS::Interpreter& interpreter)
{
auto* impl = impl_from(interpreter);
if (!impl)
return {};
auto& arguments = interpreter.call_frame().arguments;
if (arguments.size() < 3)
return interpreter.throw_exception<JS::TypeError>("drawImage() needs more arguments");
auto* image_argument = arguments[0].to_object(interpreter.heap());
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 = arguments[1].to_double();
auto y = arguments[2].to_double();
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);