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

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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
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@ -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();
}
}
}