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

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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@ -29,6 +29,7 @@
#include <LibWeb/DOM/CanvasRenderingContext2D.h>
#include <LibWeb/DOM/HTMLCanvasElement.h>
#include <LibWeb/DOM/HTMLImageElement.h>
#include <LibWeb/DOM/ImageData.h>
namespace Web {
@ -175,4 +176,18 @@ void CanvasRenderingContext2D::stroke()
painter->stroke_path(m_path, m_stroke_style, m_line_width);
}
RefPtr<ImageData> CanvasRenderingContext2D::create_image_data(JS::GlobalObject& global_object, int width, int height) const
{
return ImageData::create_with_size(global_object, width, height);
}
void CanvasRenderingContext2D::put_image_data(const ImageData& image_data, float x, float y)
{
auto painter = this->painter();
if (!painter)
return;
painter->blit(Gfx::Point(x, y), image_data.bitmap(), image_data.bitmap().rect());
}
}

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@ -71,6 +71,9 @@ public:
void line_to(float x, float y);
void stroke();
RefPtr<ImageData> create_image_data(JS::GlobalObject&, int width, int height) const;
void put_image_data(const ImageData&, float x, float y);
private:
explicit CanvasRenderingContext2D(HTMLCanvasElement&);

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@ -0,0 +1,86 @@
/*
* 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 <LibGfx/Bitmap.h>
#include <LibJS/Runtime/Uint8ClampedArray.h>
#include <LibWeb/DOM/ImageData.h>
namespace Web {
RefPtr<ImageData> ImageData::create_with_size(JS::GlobalObject& global_object, int width, int height)
{
if (width <= 0 || height <= 0)
return nullptr;
if (width > 16384 || height > 16384)
return nullptr;
dbg() << "Creating ImageData with " << width << "x" << height;
auto* data = JS::Uint8ClampedArray::create(global_object, width * height * 4);
if (!data)
return nullptr;
auto data_handle = JS::make_handle(data);
auto bitmap = Gfx::Bitmap::create_wrapper(Gfx::BitmapFormat::RGBA32, Gfx::Size(width, height), width * sizeof(u32), (u32*)data->data());
if (!bitmap)
return nullptr;
return adopt(*new ImageData(bitmap.release_nonnull(), move(data_handle)));
}
ImageData::ImageData(NonnullRefPtr<Gfx::Bitmap> bitmap, JS::Handle<JS::Uint8ClampedArray> data)
: m_bitmap(move(bitmap))
, m_data(move(data))
{
}
ImageData::~ImageData()
{
}
int ImageData::width() const
{
return m_bitmap->width();
}
int ImageData::height() const
{
return m_bitmap->height();
}
JS::Uint8ClampedArray* ImageData::data()
{
return m_data.cell();
}
const JS::Uint8ClampedArray* ImageData::data() const
{
return m_data.cell();
}
}

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@ -0,0 +1,61 @@
/*
* 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 <LibGfx/Forward.h>
#include <LibJS/Heap/Handle.h>
#include <LibWeb/Bindings/Wrappable.h>
namespace Web {
class ImageData
: public RefCounted<ImageData>
, public Bindings::Wrappable {
public:
using WrapperType = Bindings::ImageDataWrapper;
static RefPtr<ImageData> create_with_size(JS::GlobalObject&, int width, int height);
~ImageData();
int width() const;
int height() const;
Gfx::Bitmap& bitmap() { return m_bitmap; }
const Gfx::Bitmap& bitmap() const { return m_bitmap; }
JS::Uint8ClampedArray* data();
const JS::Uint8ClampedArray* data() const;
private:
explicit ImageData(NonnullRefPtr<Gfx::Bitmap>, JS::Handle<JS::Uint8ClampedArray>);
NonnullRefPtr<Gfx::Bitmap> m_bitmap;
JS::Handle<JS::Uint8ClampedArray> m_data;
};
}