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LibWeb: Convert images to common AbstractImageStyleValue base

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This commit moves both the ImageStyleValue and LinearGradientStyleValue
to a common base class of AbstractImageStyleValue. This abstracts
getting the natural_width/height, loading/resolving, and painting
the image.

Now for 'free' you get:

 - Linear gradients working with the various background sizing/repeat
   properties.
 - Linear gradients working as list-markers :^) -- best feature ever!

P.s. This commit is a little large as it's tricky to make this change
incrementally without breaking things.
This commit is contained in:
MacDue 2022-07-31 01:11:59 +01:00 • committed by Andreas Kling
parent 264543b90a
commit 6a6475673f
13 changed files with 140 additions and 70 deletions
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17
Userland/Libraries/LibWeb/Painting/GradientPainting.cpp
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@ -8,6 +8,7 @@
#include <AK/Math.h>
#include <LibGfx/Gamma.h>
#include <LibGfx/Line.h>
#include <LibWeb/CSS/StyleValue.h>
#include <LibWeb/Painting/GradientPainting.h>
namespace Web::Painting {
@ -19,20 +20,20 @@ static float normalized_gradient_angle_radians(float gradient_angle)
return real_angle * (AK::Pi<float> / 180);
}
static float calulate_gradient_length(Gfx::IntRect const& gradient_rect, float sin_angle, float cos_angle)
static float calulate_gradient_length(Gfx::IntSize const& gradient_size, float sin_angle, float cos_angle)
{
return AK::fabs(gradient_rect.height() * sin_angle) + AK::fabs(gradient_rect.width() * cos_angle);
return AK::fabs(gradient_size.height() * sin_angle) + AK::fabs(gradient_size.width() * cos_angle);
}
static float calulate_gradient_length(Gfx::IntRect const& gradient_rect, float gradient_angle)
static float calulate_gradient_length(Gfx::IntSize const& gradient_size, float gradient_angle)
{
float angle = normalized_gradient_angle_radians(gradient_angle);
float sin_angle, cos_angle;
AK::sincos(angle, sin_angle, cos_angle);
return calulate_gradient_length(gradient_rect, sin_angle, cos_angle);
return calulate_gradient_length(gradient_size, sin_angle, cos_angle);
}
LinearGradientData resolve_linear_gradient_data(Layout::Node const& node, Gfx::FloatRect const& gradient_rect, CSS::LinearGradientStyleValue const& linear_gradient)
LinearGradientData resolve_linear_gradient_data(Layout::Node const& node, Gfx::FloatSize const& gradient_size, CSS::LinearGradientStyleValue const& linear_gradient)
{
auto& color_stop_list = linear_gradient.color_stop_list();
@ -42,8 +43,8 @@ LinearGradientData resolve_linear_gradient_data(Layout::Node const& node, Gfx::F
for (auto& stop : color_stop_list)
resolved_color_stops.append(ColorStop { .color = stop.color_stop.color });
auto gradient_angle = linear_gradient.angle_degrees(gradient_rect);
auto gradient_length_px = calulate_gradient_length(gradient_rect.to_rounded<int>(), gradient_angle);
auto gradient_angle = linear_gradient.angle_degrees(gradient_size);
auto gradient_length_px = calulate_gradient_length(gradient_size.to_rounded<int>(), gradient_angle);
auto gradient_length = CSS::Length::make_px(gradient_length_px);
// 1. If the first color stop does not have a position, set its position to 0%.
@ -137,7 +138,7 @@ void paint_linear_gradient(PaintContext& context, Gfx::IntRect const& gradient_r
float sin_angle, cos_angle;
AK::sincos(angle, sin_angle, cos_angle);
auto length = calulate_gradient_length(gradient_rect, sin_angle, cos_angle);
auto length = calulate_gradient_length(gradient_rect.size(), sin_angle, cos_angle);
Gfx::FloatPoint offset { cos_angle * (length / 2), sin_angle * (length / 2) };