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LibWeb: Make PaintContext aware of CSS and DevicePixels

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Store the ratio between device and CSS pixels on the PaintContext, so
that it can convert between the two.

Co-authored-by: MacDue <macdue@dueutil.tech>
This commit is contained in:
Sam Atkins 2022-10-26 20:53:41 +01:00 • committed by Linus Groh
parent a3298017d6
commit 0be479dcfb
4 changed files with 93 additions and 5 deletions
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76
Userland/Libraries/LibWeb/Painting/PaintContext.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -8,9 +9,10 @@
namespace Web {
PaintContext::PaintContext(Gfx::Painter& painter, Palette const& palette)
PaintContext::PaintContext(Gfx::Painter& painter, Palette const& palette, float device_pixels_per_css_pixel)
: m_painter(painter)
, m_palette(palette)
, m_device_pixels_per_css_pixel(device_pixels_per_css_pixel)
{
}
@ -32,4 +34,76 @@ void PaintContext::clear_svg_context()
m_svg_context.clear();
}
DevicePixels PaintContext::rounded_device_pixels(CSSPixels css_pixels) const
{
return roundf(css_pixels.value() * m_device_pixels_per_css_pixel);
}
DevicePixels PaintContext::enclosing_device_pixels(CSSPixels css_pixels) const
{
return ceilf(css_pixels.value() * m_device_pixels_per_css_pixel);
}
DevicePixels PaintContext::floored_device_pixels(CSSPixels css_pixels) const
{
return floorf(css_pixels.value() * m_device_pixels_per_css_pixel);
}
DevicePixelPoint PaintContext::rounded_device_point(CSSPixelPoint point) const
{
return {
roundf(point.x().value() * m_device_pixels_per_css_pixel),
roundf(point.y().value() * m_device_pixels_per_css_pixel)
};
}
DevicePixelRect PaintContext::enclosing_device_rect(CSSPixelRect rect) const
{
return {
floorf(rect.x().value() * m_device_pixels_per_css_pixel),
floorf(rect.y().value() * m_device_pixels_per_css_pixel),
ceilf(rect.width().value() * m_device_pixels_per_css_pixel),
ceilf(rect.height().value() * m_device_pixels_per_css_pixel)
};
}
DevicePixelRect PaintContext::rounded_device_rect(CSSPixelRect rect) const
{
return {
roundf(rect.x().value() * m_device_pixels_per_css_pixel),
roundf(rect.y().value() * m_device_pixels_per_css_pixel),
roundf(rect.width().value() * m_device_pixels_per_css_pixel),
roundf(rect.height().value() * m_device_pixels_per_css_pixel)
};
}
DevicePixelSize PaintContext::enclosing_device_size(CSSPixelSize size) const
{
return {
ceilf(size.width().value() * m_device_pixels_per_css_pixel),
ceilf(size.height().value() * m_device_pixels_per_css_pixel)
};
}
DevicePixelSize PaintContext::rounded_device_size(CSSPixelSize size) const
{
return {
roundf(size.width().value() * m_device_pixels_per_css_pixel),
roundf(size.height().value() * m_device_pixels_per_css_pixel)
};
}
CSSPixels PaintContext::scale_to_css_pixels(DevicePixels device_pixels) const
{
return device_pixels.value() / m_device_pixels_per_css_pixel;
}
CSSPixelPoint PaintContext::scale_to_css_point(DevicePixelPoint point) const
{
return {
scale_to_css_pixels(point.x()),
scale_to_css_pixels(point.y())
};
}
}