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LibWeb+WebContent: Forbid access to underlying type of CSSPixels

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Although DistinctNumeric, which is supposed to abstract the underlying
type, was used to represent CSSPixels, we have a whole bunch of places
in the layout code that assume CSSPixels::value() returns a
floating-point type. This assumption makes it difficult to replace the
underlying type in CSSPixels with a non-floating type.

To make it easier to transition CSSPixels to fixed-point math, one step
we can take is to prevent access to the underlying type using value()
and instead use explicit conversions with the to_float(), to_double(),
and to_int() methods.
This commit is contained in:
Aliaksandr Kalenik 2023-06-12 21:37:35 +03:00 • committed by Andreas Kling
parent 5a54c686a7
commit 147c3b3d97
43 changed files with 340 additions and 220 deletions
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22
Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp
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@ -29,7 +29,7 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
inline void shrink(CSSPixels top, CSSPixels right, CSSPixels bottom, CSSPixels left)
{
rect.shrink(top, right, bottom, left);
radii.shrink(top.value(), right.value(), bottom.value(), left.value());
radii.shrink(top, right, bottom, left);
}
};
@ -137,8 +137,8 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
}
// FIXME: Implement proper default sizing algorithm: https://drafts.csswg.org/css-images/#default-sizing
CSSPixels natural_image_width = image.natural_width().value_or(background_positioning_area.width().value());
CSSPixels natural_image_height = image.natural_height().value_or(background_positioning_area.height().value());
CSSPixels natural_image_width = image.natural_width().value_or(background_positioning_area.width());
CSSPixels natural_image_height = image.natural_height().value_or(background_positioning_area.height());
// If any of these are zero, the NaNs will pop up in the painting code.
if (background_positioning_area.is_empty() || natural_image_height <= 0 || natural_image_width <= 0)
@ -148,15 +148,15 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
CSSPixelRect image_rect;
switch (layer.size_type) {
case CSS::BackgroundSize::Contain: {
double max_width_ratio = (background_positioning_area.width() / natural_image_width).value();
double max_height_ratio = (background_positioning_area.height() / natural_image_height).value();
double max_width_ratio = (background_positioning_area.width() / natural_image_width).to_double();
double max_height_ratio = (background_positioning_area.height() / natural_image_height).to_double();
double ratio = min(max_width_ratio, max_height_ratio);
image_rect.set_size(natural_image_width * ratio, natural_image_height * ratio);
break;
}
case CSS::BackgroundSize::Cover: {
double max_width_ratio = (background_positioning_area.width() / natural_image_width).value();
double max_height_ratio = (background_positioning_area.height() / natural_image_height).value();
double max_width_ratio = (background_positioning_area.width() / natural_image_width).to_double();
double max_height_ratio = (background_positioning_area.height() / natural_image_height).to_double();
double ratio = max(max_width_ratio, max_height_ratio);
image_rect.set_size(natural_image_width * ratio, natural_image_height * ratio);
break;
@ -247,12 +247,12 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
repeat_x = true;
break;
case CSS::Repeat::Space: {
int whole_images = (background_positioning_area.width() / image_rect.width()).value();
int whole_images = (background_positioning_area.width() / image_rect.width()).to_int();
if (whole_images <= 1) {
x_step = image_rect.width();
repeat_x = false;
} else {
auto space = fmod(background_positioning_area.width(), image_rect.width());
auto space = fmod(background_positioning_area.width().to_float(), image_rect.width().to_float());
x_step = image_rect.width() + (space / static_cast<double>(whole_images - 1));
repeat_x = true;
}
@ -278,12 +278,12 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
repeat_y = true;
break;
case CSS::Repeat::Space: {
int whole_images = (background_positioning_area.height() / image_rect.height()).value();
int whole_images = (background_positioning_area.height() / image_rect.height()).to_int();
if (whole_images <= 1) {
y_step = image_rect.height();
repeat_y = false;
} else {
auto space = fmod(background_positioning_area.height(), image_rect.height());
auto space = fmod(background_positioning_area.height().to_float(), image_rect.height().to_float());
y_step = image_rect.height() + (static_cast<double>(space) / static_cast<double>(whole_images - 1));
repeat_y = true;
}