mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 15:32:46 +00:00
523 lines
23 KiB
C++
523 lines
23 KiB
C++
/*
|
||
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
|
||
*
|
||
* SPDX-License-Identifier: BSD-2-Clause
|
||
*/
|
||
|
||
#include <AK/Math.h>
|
||
#include <LibGfx/Gradients.h>
|
||
#include <LibGfx/PaintStyle.h>
|
||
#include <LibGfx/Painter.h>
|
||
|
||
#if defined(AK_COMPILER_GCC)
|
||
# pragma GCC optimize("O3")
|
||
#endif
|
||
|
||
namespace Gfx {
|
||
|
||
// Note: This file implements the CSS/Canvas gradients for LibWeb according to the spec.
|
||
// Please do not make ad-hoc changes that may break spec compliance!
|
||
|
||
static float color_stop_step(ColorStop const& previous_stop, ColorStop const& next_stop, float position)
|
||
{
|
||
if (position < previous_stop.position)
|
||
return 0;
|
||
if (position > next_stop.position)
|
||
return 1;
|
||
// For any given point between the two color stops,
|
||
// determine the point’s location as a percentage of the distance between the two color stops.
|
||
// Let this percentage be P.
|
||
auto stop_length = next_stop.position - previous_stop.position;
|
||
// FIXME: Avoids NaNs... Still not quite correct?
|
||
if (stop_length <= 0)
|
||
return 1;
|
||
auto p = (position - previous_stop.position) / stop_length;
|
||
if (!next_stop.transition_hint.has_value())
|
||
return p;
|
||
if (*next_stop.transition_hint >= 1)
|
||
return 0;
|
||
if (*next_stop.transition_hint <= 0)
|
||
return 1;
|
||
// Let C, the color weighting at that point, be equal to P^(logH(.5)).
|
||
auto c = AK::pow(p, AK::log<float>(0.5) / AK::log(*next_stop.transition_hint));
|
||
// The color at that point is then a linear blend between the colors of the two color stops,
|
||
// blending (1 - C) of the first stop and C of the second stop.
|
||
return c;
|
||
}
|
||
|
||
enum class UsePremultipliedAlpha {
|
||
Yes,
|
||
No
|
||
};
|
||
|
||
class GradientLine {
|
||
public:
|
||
GradientLine(int gradient_length, ReadonlySpan<ColorStop> color_stops, Optional<float> repeat_length, UsePremultipliedAlpha use_premultiplied_alpha = UsePremultipliedAlpha::Yes)
|
||
: m_repeating(repeat_length.has_value())
|
||
, m_start_offset(round_to<int>((m_repeating ? color_stops.first().position : 0.0f) * gradient_length))
|
||
, m_color_stops(color_stops)
|
||
, m_use_premultiplied_alpha(use_premultiplied_alpha)
|
||
{
|
||
// Avoid generating excessive amounts of colors when the not enough shades to fill that length.
|
||
auto necessary_length = min<int>((color_stops.size() - 1) * 255, gradient_length);
|
||
m_sample_scale = float(necessary_length) / gradient_length;
|
||
// Note: color_count will be < gradient_length for repeating gradients.
|
||
auto color_count = round_to<int>(repeat_length.value_or(1.0f) * necessary_length);
|
||
m_gradient_line_colors.resize(color_count);
|
||
|
||
for (int loc = 0; loc < color_count; loc++) {
|
||
auto relative_loc = float(loc + m_start_offset) / necessary_length;
|
||
Color gradient_color = color_blend(color_stops[0].color, color_stops[1].color,
|
||
color_stop_step(color_stops[0], color_stops[1], relative_loc));
|
||
for (size_t i = 1; i < color_stops.size() - 1; i++) {
|
||
gradient_color = color_blend(gradient_color, color_stops[i + 1].color,
|
||
color_stop_step(color_stops[i], color_stops[i + 1], relative_loc));
|
||
}
|
||
m_gradient_line_colors[loc] = gradient_color;
|
||
if (gradient_color.alpha() < 255)
|
||
m_requires_blending = true;
|
||
}
|
||
}
|
||
|
||
Color color_blend(Color a, Color b, float amount) const
|
||
{
|
||
// Note: color.mixed_with() performs premultiplied alpha mixing when necessary as defined in:
|
||
// https://drafts.csswg.org/css-images/#coloring-gradient-line
|
||
if (m_use_premultiplied_alpha == UsePremultipliedAlpha::Yes)
|
||
return a.mixed_with(b, amount);
|
||
return a.interpolate(b, amount);
|
||
};
|
||
|
||
Color get_color(i64 index) const
|
||
{
|
||
if (index < 0)
|
||
return m_color_stops.first().color;
|
||
if (index >= static_cast<i64>(m_gradient_line_colors.size()))
|
||
return m_color_stops.last().color;
|
||
return m_gradient_line_colors[index];
|
||
}
|
||
|
||
Color sample_color(float loc) const
|
||
{
|
||
if (!isfinite(loc))
|
||
return Color();
|
||
if (m_sample_scale != 1.0f)
|
||
loc *= m_sample_scale;
|
||
auto repeat_wrap_if_required = [&](i64 loc) {
|
||
if (m_repeating)
|
||
return (loc + m_start_offset) % static_cast<i64>(m_gradient_line_colors.size());
|
||
return loc;
|
||
};
|
||
auto int_loc = static_cast<i64>(floor(loc));
|
||
auto blend = loc - int_loc;
|
||
auto color = get_color(repeat_wrap_if_required(int_loc));
|
||
// Blend between the two neighboring colors (this fixes some nasty aliasing issues at small angles)
|
||
if (blend >= 0.004f)
|
||
color = color_blend(color, get_color(repeat_wrap_if_required(int_loc + 1)), blend);
|
||
return color;
|
||
}
|
||
|
||
void paint_into_physical_rect(Painter& painter, IntRect rect, auto location_transform)
|
||
{
|
||
auto clipped_rect = rect.intersected(painter.clip_rect() * painter.scale());
|
||
auto start_offset = clipped_rect.location() - rect.location();
|
||
for (int y = 0; y < clipped_rect.height(); y++) {
|
||
for (int x = 0; x < clipped_rect.width(); x++) {
|
||
auto pixel = sample_color(location_transform(x + start_offset.x(), y + start_offset.y()));
|
||
painter.set_physical_pixel(clipped_rect.location().translated(x, y), pixel, m_requires_blending);
|
||
}
|
||
}
|
||
}
|
||
|
||
private:
|
||
bool m_repeating { false };
|
||
int m_start_offset { 0 };
|
||
float m_sample_scale { 1 };
|
||
ReadonlySpan<ColorStop> m_color_stops {};
|
||
UsePremultipliedAlpha m_use_premultiplied_alpha { UsePremultipliedAlpha::Yes };
|
||
|
||
Vector<Color, 1024> m_gradient_line_colors;
|
||
bool m_requires_blending = false;
|
||
};
|
||
|
||
template<typename TransformFunction>
|
||
struct Gradient {
|
||
Gradient(GradientLine gradient_line, TransformFunction transform_function)
|
||
: m_gradient_line(move(gradient_line))
|
||
, m_transform_function(move(transform_function))
|
||
{
|
||
}
|
||
|
||
void paint(Painter& painter, IntRect rect)
|
||
{
|
||
m_gradient_line.paint_into_physical_rect(painter, rect, m_transform_function);
|
||
}
|
||
|
||
template<typename CoordinateType = int>
|
||
auto sample_function()
|
||
{
|
||
return [this](Point<CoordinateType> point) {
|
||
return m_gradient_line.sample_color(m_transform_function(point.x(), point.y()));
|
||
};
|
||
}
|
||
|
||
private:
|
||
GradientLine m_gradient_line;
|
||
TransformFunction m_transform_function;
|
||
};
|
||
|
||
static auto create_linear_gradient(IntRect const& physical_rect, ReadonlySpan<ColorStop> color_stops, float angle, Optional<float> repeat_length)
|
||
{
|
||
float normalized_angle = normalized_gradient_angle_radians(angle);
|
||
float sin_angle, cos_angle;
|
||
AK::sincos(normalized_angle, sin_angle, cos_angle);
|
||
|
||
// Full length of the gradient
|
||
auto gradient_length = calculate_gradient_length(physical_rect.size(), sin_angle, cos_angle);
|
||
IntPoint offset { cos_angle * (gradient_length / 2), sin_angle * (gradient_length / 2) };
|
||
auto center = physical_rect.translated(-physical_rect.location()).center();
|
||
auto start_point = center - offset;
|
||
// Rotate gradient line to be horizontal
|
||
auto rotated_start_point_x = start_point.x() * cos_angle - start_point.y() * -sin_angle;
|
||
|
||
GradientLine gradient_line(gradient_length, color_stops, repeat_length);
|
||
return Gradient {
|
||
move(gradient_line),
|
||
[=](int x, int y) {
|
||
return (x * cos_angle - (physical_rect.height() - y) * -sin_angle) - rotated_start_point_x;
|
||
}
|
||
};
|
||
}
|
||
|
||
static auto create_conic_gradient(ReadonlySpan<ColorStop> color_stops, FloatPoint center_point, float start_angle, Optional<float> repeat_length, UsePremultipliedAlpha use_premultiplied_alpha = UsePremultipliedAlpha::Yes)
|
||
{
|
||
// FIXME: Do we need/want sub-degree accuracy for the gradient line?
|
||
GradientLine gradient_line(360, color_stops, repeat_length, use_premultiplied_alpha);
|
||
float normalized_start_angle = (360.0f - start_angle) + 90.0f;
|
||
// The flooring can make gradients that want soft edges look worse, so only floor if we have hard edges.
|
||
// Which makes sure the hard edge stay hard edges :^)
|
||
bool should_floor_angles = false;
|
||
for (size_t i = 0; i < color_stops.size() - 1; i++) {
|
||
if (color_stops[i + 1].position - color_stops[i].position <= 0.01f) {
|
||
should_floor_angles = true;
|
||
break;
|
||
}
|
||
}
|
||
return Gradient {
|
||
move(gradient_line),
|
||
[=](int x, int y) {
|
||
auto point = FloatPoint { x, y } - center_point;
|
||
// FIXME: We could probably get away with some approximation here:
|
||
auto loc = fmod((AK::atan2(point.y(), point.x()) * 180.0f / AK::Pi<float> + 360.0f + normalized_start_angle), 360.0f);
|
||
return should_floor_angles ? floor(loc) : loc;
|
||
}
|
||
};
|
||
}
|
||
|
||
static auto create_radial_gradient(IntRect const& physical_rect, ReadonlySpan<ColorStop> color_stops, IntPoint center, IntSize size, Optional<float> repeat_length, Optional<float> rotation_angle = {})
|
||
{
|
||
// A conservative guesstimate on how many colors we need to generate:
|
||
auto max_dimension = max(physical_rect.width(), physical_rect.height());
|
||
auto max_visible_gradient = max(max_dimension / 2, min(size.width(), max_dimension));
|
||
GradientLine gradient_line(max_visible_gradient, color_stops, repeat_length);
|
||
auto center_point = FloatPoint { center }.translated(0.5, 0.5);
|
||
AffineTransform rotation_transform;
|
||
if (rotation_angle.has_value()) {
|
||
auto angle_as_radians = rotation_angle.value() * (AK::Pi<float> / 180);
|
||
rotation_transform.rotate_radians(angle_as_radians);
|
||
}
|
||
|
||
return Gradient {
|
||
move(gradient_line),
|
||
[=](int x, int y) {
|
||
// FIXME: See if there's a more efficient calculation we do there :^)
|
||
auto point = FloatPoint(x, y) - center_point;
|
||
|
||
if (rotation_angle.has_value())
|
||
point.transform_by(rotation_transform);
|
||
|
||
auto gradient_x = point.x() / size.width();
|
||
auto gradient_y = point.y() / size.height();
|
||
return AK::sqrt(gradient_x * gradient_x + gradient_y * gradient_y) * max_visible_gradient;
|
||
}
|
||
};
|
||
}
|
||
|
||
void Painter::fill_rect_with_linear_gradient(IntRect const& rect, ReadonlySpan<ColorStop> color_stops, float angle, Optional<float> repeat_length)
|
||
{
|
||
auto a_rect = to_physical(rect);
|
||
if (a_rect.intersected(clip_rect() * scale()).is_empty())
|
||
return;
|
||
auto linear_gradient = create_linear_gradient(a_rect, color_stops, angle, repeat_length);
|
||
linear_gradient.paint(*this, a_rect);
|
||
}
|
||
|
||
static FloatPoint pixel_center(IntPoint point)
|
||
{
|
||
return point.to_type<float>().translated(0.5f, 0.5f);
|
||
}
|
||
|
||
void Painter::fill_rect_with_conic_gradient(IntRect const& rect, ReadonlySpan<ColorStop> color_stops, IntPoint center, float start_angle, Optional<float> repeat_length)
|
||
{
|
||
auto a_rect = to_physical(rect);
|
||
if (a_rect.intersected(clip_rect() * scale()).is_empty())
|
||
return;
|
||
// Translate position/center to the center of the pixel (avoids some funky painting)
|
||
auto center_point = pixel_center(center * scale());
|
||
auto conic_gradient = create_conic_gradient(color_stops, center_point, start_angle, repeat_length);
|
||
conic_gradient.paint(*this, a_rect);
|
||
}
|
||
|
||
void Painter::fill_rect_with_radial_gradient(IntRect const& rect, ReadonlySpan<ColorStop> color_stops, IntPoint center, IntSize size, Optional<float> repeat_length, Optional<float> rotation_angle)
|
||
{
|
||
auto a_rect = to_physical(rect);
|
||
if (a_rect.intersected(clip_rect() * scale()).is_empty())
|
||
return;
|
||
|
||
auto radial_gradient = create_radial_gradient(a_rect, color_stops, center * scale(), size * scale(), repeat_length, rotation_angle);
|
||
radial_gradient.paint(*this, a_rect);
|
||
}
|
||
|
||
// TODO: Figure out how to handle scale() here... Not important while not supported by fill_path()
|
||
|
||
void LinearGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
VERIFY(color_stops().size() > 2);
|
||
auto linear_gradient = create_linear_gradient(physical_bounding_box, color_stops(), m_angle, repeat_length());
|
||
paint(linear_gradient.sample_function());
|
||
}
|
||
|
||
void ConicGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
VERIFY(color_stops().size() > 2);
|
||
(void)physical_bounding_box;
|
||
auto conic_gradient = create_conic_gradient(color_stops(), pixel_center(m_center), m_start_angle, repeat_length());
|
||
paint(conic_gradient.sample_function());
|
||
}
|
||
|
||
void RadialGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
VERIFY(color_stops().size() > 2);
|
||
auto radial_gradient = create_radial_gradient(physical_bounding_box, color_stops(), m_center, m_size, repeat_length());
|
||
paint(radial_gradient.sample_function());
|
||
}
|
||
|
||
// The following implements the gradient fill/stoke styles for the HTML canvas: https://html.spec.whatwg.org/multipage/canvas.html#fill-and-stroke-styles
|
||
|
||
static auto make_sample_non_relative(IntPoint draw_location, auto sample)
|
||
{
|
||
return [=, sample = move(sample)](IntPoint point) { return sample(point.translated(draw_location)); };
|
||
}
|
||
|
||
static auto make_linear_gradient_between_two_points(FloatPoint p0, FloatPoint p1, ReadonlySpan<ColorStop> color_stops, Optional<float> repeat_length)
|
||
{
|
||
auto delta = p1 - p0;
|
||
auto angle = AK::atan2(delta.y(), delta.x());
|
||
float sin_angle, cos_angle;
|
||
AK::sincos(angle, sin_angle, cos_angle);
|
||
int gradient_length = ceilf(p1.distance_from(p0));
|
||
auto rotated_start_point_x = p0.x() * cos_angle - p0.y() * -sin_angle;
|
||
|
||
return Gradient {
|
||
GradientLine(gradient_length, color_stops, repeat_length, UsePremultipliedAlpha::No),
|
||
[=](int x, int y) {
|
||
return (x * cos_angle - y * -sin_angle) - rotated_start_point_x;
|
||
}
|
||
};
|
||
}
|
||
|
||
void CanvasLinearGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
// If x0 = x1 and y0 = y1, then the linear gradient must paint nothing.
|
||
if (m_p0 == m_p1)
|
||
return;
|
||
if (color_stops().is_empty())
|
||
return;
|
||
if (color_stops().size() < 2)
|
||
return paint([this](IntPoint) { return color_stops().first().color; });
|
||
|
||
auto linear_gradient = make_linear_gradient_between_two_points(m_p0, m_p1, color_stops(), repeat_length());
|
||
paint(make_sample_non_relative(physical_bounding_box.location(), linear_gradient.sample_function()));
|
||
}
|
||
|
||
void SVGGradientPaintStyle::set_gradient_transform(AffineTransform transform)
|
||
{
|
||
// Note: The scaling is removed so enough points on the gradient line are generated.
|
||
// Otherwise, if you scale a tiny path the gradient looks pixelated.
|
||
m_scale = 1.0f;
|
||
if (auto inverse = transform.inverse(); inverse.has_value()) {
|
||
auto transform_scale = transform.scale();
|
||
m_scale = max(transform_scale.x(), transform_scale.y());
|
||
m_inverse_transform = AffineTransform {}.scale(m_scale, m_scale).multiply(*inverse);
|
||
} else {
|
||
m_inverse_transform = OptionalNone {};
|
||
}
|
||
}
|
||
|
||
void SVGLinearGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
if (color_stops().is_empty())
|
||
return;
|
||
// If ‘x1’ = ‘x2’ and ‘y1’ = ‘y2’, then the area to be painted will be painted as
|
||
// a single color using the color and opacity of the last gradient stop.
|
||
if (m_p0 == m_p1)
|
||
return paint([this](IntPoint) { return color_stops().last().color; });
|
||
if (color_stops().size() < 2)
|
||
return paint([this](IntPoint) { return color_stops().first().color; });
|
||
|
||
float scale = gradient_transform_scale();
|
||
auto linear_gradient = make_linear_gradient_between_two_points(
|
||
m_p0.scaled(scale, scale), m_p1.scaled(scale, scale),
|
||
color_stops(), repeat_length());
|
||
|
||
paint([&, sampler = linear_gradient.sample_function<float>()](IntPoint target_point) {
|
||
auto point = target_point.translated(physical_bounding_box.location()).to_type<float>();
|
||
if (auto inverse_transform = scale_adjusted_inverse_gradient_transform(); inverse_transform.has_value())
|
||
point = inverse_transform->map(point);
|
||
|
||
return sampler(point);
|
||
});
|
||
}
|
||
|
||
void CanvasConicGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
if (color_stops().is_empty())
|
||
return;
|
||
if (color_stops().size() < 2)
|
||
return paint([this](IntPoint) { return color_stops().first().color; });
|
||
|
||
// Follows the same rendering rule as CSS 'conic-gradient' and it is equivalent to CSS
|
||
// 'conic-gradient(from adjustedStartAnglerad at xpx ypx, angularColorStopList)'.
|
||
// Here:
|
||
// adjustedStartAngle is given by startAngle + π/2;
|
||
auto conic_gradient = create_conic_gradient(color_stops(), m_center, m_start_angle + 90.0f, repeat_length(), UsePremultipliedAlpha::No);
|
||
paint(make_sample_non_relative(physical_bounding_box.location(), conic_gradient.sample_function()));
|
||
}
|
||
|
||
static auto create_radial_gradient_between_two_circles(Gfx::FloatPoint start_center, float start_radius, Gfx::FloatPoint end_center, float end_radius, ReadonlySpan<ColorStop> color_stops, Optional<float> repeat_length)
|
||
{
|
||
if (fabs(start_radius - end_radius) < 1)
|
||
start_radius += 1;
|
||
|
||
// Needed for the start circle > end circle case, but FIXME, this seems kind of hacky.
|
||
bool reverse_gradient = end_radius < start_radius;
|
||
if (reverse_gradient) {
|
||
swap(end_radius, start_radius);
|
||
swap(end_center, start_center);
|
||
}
|
||
|
||
// Spec steps: Useless for writing an actual implementation (give it a go :P):
|
||
//
|
||
// 2. Let x(ω) = (x1-x0)ω + x0
|
||
// Let y(ω) = (y1-y0)ω + y0
|
||
// Let r(ω) = (r1-r0)ω + r0
|
||
// Let the color at ω be the color at that position on the gradient
|
||
// (with the colors coming from the interpolation and extrapolation described above).
|
||
//
|
||
// 3. For all values of ω where r(ω) > 0, starting with the value of ω nearest to positive infinity and
|
||
// ending with the value of ω nearest to negative infinity, draw the circumference of the circle with
|
||
// radius r(ω) at position (x(ω), y(ω)), with the color at ω, but only painting on the parts of the
|
||
// bitmap that have not yet been painted on by earlier circles in this step for this rendering of the gradient.
|
||
|
||
auto center_delta = end_center - start_center;
|
||
auto center_dist = end_center.distance_from(start_center);
|
||
bool inner_contained = ((center_dist + start_radius) < end_radius);
|
||
|
||
auto start_point = start_center;
|
||
if (!inner_contained) {
|
||
// The intersection point of the direct common tangents of the start/end circles.
|
||
start_point = FloatPoint {
|
||
(start_radius * end_center.x() - end_radius * start_center.x()) / (start_radius - end_radius),
|
||
(start_radius * end_center.y() - end_radius * start_center.y()) / (start_radius - end_radius)
|
||
};
|
||
}
|
||
|
||
// This is just an approximate upperbound (the gradient line class will shorten this if necessary).
|
||
int gradient_length = AK::ceil(center_dist + end_radius + start_radius);
|
||
GradientLine gradient_line(gradient_length, color_stops, repeat_length, UsePremultipliedAlpha::No);
|
||
|
||
auto radius2 = end_radius * end_radius;
|
||
center_delta = end_center - start_point;
|
||
auto dx2_factor = (radius2 - center_delta.y() * center_delta.y());
|
||
auto dy2_factor = (radius2 - center_delta.x() * center_delta.x());
|
||
|
||
// If you can simplify this please do, this is "best guess" implementation due to lack of specification.
|
||
// It was implemented to visually match chrome/firefox in all cases:
|
||
// - Start circle inside end circle
|
||
// - Start circle outside end circle
|
||
// - Start circle radius == end circle radius
|
||
// - Start circle larger than end circle (inside end circle)
|
||
// - Start circle larger than end circle (outside end circle)
|
||
// - Start circle or end circle radius == 0
|
||
|
||
return Gradient {
|
||
move(gradient_line),
|
||
[=](float x, float y) {
|
||
auto get_gradient_location = [&] {
|
||
FloatPoint point { x, y };
|
||
auto dist = point.distance_from(start_point);
|
||
if (dist == 0)
|
||
return 0.0f;
|
||
auto vec = (point - start_point) / dist;
|
||
auto dx2 = vec.x() * vec.x();
|
||
auto dy2 = vec.y() * vec.y();
|
||
// This works out the distance to the nearest point on the end circle in the direction of the "vec" vector.
|
||
// The "vec" vector points from the center of the start circle to the current point.
|
||
auto root = sqrtf(dx2 * dx2_factor + dy2 * dy2_factor
|
||
+ 2 * vec.x() * vec.y() * center_delta.x() * center_delta.y());
|
||
auto dot = vec.x() * center_delta.x() + vec.y() * center_delta.y();
|
||
// Note: When reversed we always want the farthest point
|
||
auto edge_dist = (((inner_contained || reverse_gradient ? root : -root) + dot) / (dx2 + dy2));
|
||
auto start_offset = inner_contained ? start_radius : (edge_dist / end_radius) * start_radius;
|
||
// FIXME: Returning nan is a hack for "Don't paint me!"
|
||
if (edge_dist < 0)
|
||
return AK::NaN<float>;
|
||
if (edge_dist - start_offset < 0)
|
||
return float(gradient_length);
|
||
return ((dist - start_offset) / (edge_dist - start_offset));
|
||
};
|
||
auto loc = get_gradient_location();
|
||
if (reverse_gradient)
|
||
loc = 1.0f - loc;
|
||
return loc * gradient_length;
|
||
}
|
||
};
|
||
}
|
||
|
||
void CanvasRadialGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
// 1. If x0 = x1 and y0 = y1 and r0 = r1, then the radial gradient must paint nothing. Return.
|
||
if (m_start_center == m_end_center && m_start_radius == m_end_radius)
|
||
return;
|
||
if (color_stops().is_empty())
|
||
return;
|
||
if (color_stops().size() < 2)
|
||
return paint([this](IntPoint) { return color_stops().first().color; });
|
||
if (m_end_radius == 0 && m_start_radius == 0)
|
||
return;
|
||
auto radial_gradient = create_radial_gradient_between_two_circles(m_start_center, m_start_radius, m_end_center, m_end_radius, color_stops(), repeat_length());
|
||
paint(make_sample_non_relative(physical_bounding_box.location(), radial_gradient.sample_function()));
|
||
}
|
||
|
||
void SVGRadialGradientPaintStyle::paint(IntRect physical_bounding_box, PaintFunction paint) const
|
||
{
|
||
// FIXME: Ensure this handles all the edge cases of SVG gradients.
|
||
if (color_stops().is_empty())
|
||
return;
|
||
if (color_stops().size() < 2 || (m_end_radius == 0 && m_start_radius == 0))
|
||
return paint([this](IntPoint) { return color_stops().last().color; });
|
||
|
||
float scale = gradient_transform_scale();
|
||
auto radial_gradient = create_radial_gradient_between_two_circles(
|
||
m_start_center.scaled(scale, scale), m_start_radius * scale, m_end_center.scaled(scale, scale), m_end_radius * scale,
|
||
color_stops(), repeat_length());
|
||
|
||
paint([&, sampler = radial_gradient.sample_function<float>()](IntPoint target_point) {
|
||
auto point = target_point.translated(physical_bounding_box.location()).to_type<float>();
|
||
if (auto inverse_transform = scale_adjusted_inverse_gradient_transform(); inverse_transform.has_value())
|
||
point = inverse_transform->map(point);
|
||
return sampler(point);
|
||
});
|
||
}
|
||
|
||
}
|