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LibGfx: Add simple VectorGraphic abstract base class

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This is currently very bare-bones with just the size and a few methods
to rasterize/draw the graphic.
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MacDue 2023-07-05 19:02:00 +01:00 • committed by Andreas Kling
parent aaf1b762ea
commit 16b487c270
3 changed files with 66 additions and 0 deletions
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35
Userland/Libraries/LibGfx/VectorGraphic.cpp Normal file
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/*
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Painter.h>
#include <LibGfx/VectorGraphic.h>
namespace Gfx {
void VectorGraphic::draw_into(Painter& painter, IntRect const& dest, AffineTransform transform) const
{
// Apply the transform then center within destination rectangle (this ignores any translation from the transform):
// This allows you to easily rotate or flip the image before painting.
auto transformed_rect = transform.map(FloatRect { {}, size() });
auto scale = min(float(dest.width()) / transformed_rect.width(), float(dest.height()) / transformed_rect.height());
auto centered = FloatRect { {}, transformed_rect.size().scaled_by(scale) }.centered_within(dest.to_type<float>());
auto view_transform = AffineTransform {}
.translate(centered.location())
.multiply(AffineTransform {}.scale(scale, scale))
.multiply(AffineTransform {}.translate(-transformed_rect.location()))
.multiply(transform);
return draw_transformed(painter, view_transform);
}
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> VectorGraphic::bitmap(IntSize size, AffineTransform transform) const
{
auto bitmap = TRY(Bitmap::create(Gfx::BitmapFormat::BGRA8888, size));
Painter painter { *bitmap };
draw_into(painter, IntRect { {}, size }, transform);
return bitmap;
}
}