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LibWeb: Parse fill and stroke values

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Use the CSS color data type using the CSS parser.
This commit is contained in:
doctortheemh 2024-07-22 18:59:29 -07:00 committed by Sam Atkins
parent 793248aec9
commit 9cbb3fac12
Notes: github-actions[bot] 2024-07-26 08:15:04 +00:00 
Author: https://github.com/doctortheemh
Commit: https://github.com/LadybirdBrowser/ladybird/commit/9cbb3fac123
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/779
Reviewed-by: https://github.com/AtkinsSJ ✅
5 changed files with 91 additions and 32 deletions
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8
Tests/LibWeb/Screenshot/canvas-fillstyle-rgb.html
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@ -18,11 +18,11 @@
ctx.fillRect(0, 0, 500, 100);
// Decimal numbers
ctx.fillStyle = "rgb(0.28813966673057,254.56022744510793,0.2973971574794)";
ctx.fillStyle = "rgb(254.56022744510793,0.28813966673057,0.2973971574794)";
ctx.fillRect(0, 100, 500, 100);
// Numbers below 0 and above 255 should be clamped
ctx.fillStyle = "rgba(-50,500,-50,1)";
ctx.fillStyle = "rgba(-50,-50,500,1)";
ctx.fillRect(0, 200, 500, 100);
// Percentages
@ -30,6 +30,8 @@
ctx.fillRect(0, 300, 500, 100);
// Calc
ctx.fillStyle = "rgb(0, calc(infinity), 0)";
// FIXME: The CSS parser currently chokes on calc expressions, which will
// leave the fillStyle as it was (green).
ctx.fillStyle = "rgb(calc(infinity), 0, 0)";
ctx.fillRect(0, 400, 500, 100);
</script>

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Tests/LibWeb/Screenshot/images/canvas-fillstyle-rgb.png
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8
Tests/LibWeb/Text/expected/canvas/fillstyle.txt
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@ -1,5 +1,5 @@
1. "#00ff00ff"
2. "#00ff00ff"
3. "#00ff00ff"
4. "#000000ff"
5. "#000000ff"
2. "#ff0000ff"
3. "#0000ffff"
4. "#00ff00ff"
5. "#00ff00ff"

10
Tests/LibWeb/Text/input/canvas/fillstyle.html
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@ -17,25 +17,27 @@
// 2. Decimals
testPart(() => {
context.fillStyle = "rgb(0.28813966673057,254.56022744510793,0.2973971574794)";
context.fillStyle = "rgb(254.56022744510793,0.28813966673057,0.2973971574794)";
return context.fillStyle;
});
// 3. Clamp numbers between 0-255
testPart(() => {
context.fillStyle = "rgba(-50,500,-50,1)";
context.fillStyle = "rgba(-50,-50,500,1)";
return context.fillStyle;
});
// 4. Percentages
testPart(() => {
context.fillStyle = "rgb(0%,100%,0%)";
context.fillStyle = "rgb(0%, 100%, 0%)";
return context.fillStyle;
});
// 5. Percentages
testPart(() => {
context.fillStyle = "rgb(0,calc(infinity),0)";
// FIXME: The CSS parser currently chokes on calc expressions, which will
// leave the fillStyle as it was (green).
context.fillStyle = "rgb(calc(infinity), 0, 0)";
return context.fillStyle;
});
});

97
Userland/Libraries/LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h
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@ -10,6 +10,7 @@
#pragma once
#include <AK/String.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/HTML/Canvas/CanvasState.h>
#include <LibWeb/HTML/CanvasGradient.h>
#include <LibWeb/HTML/CanvasPattern.h>
@ -23,27 +24,45 @@ public:
~CanvasFillStrokeStyles() = default;
using FillOrStrokeStyleVariant = Variant<String, JS::Handle<CanvasGradient>, JS::Handle<CanvasPattern>>;
static CanvasState::FillOrStrokeStyle to_canvas_state_fill_or_stroke_style(auto const& style)
{
return style.visit(
[&](String const& string) -> CanvasState::FillOrStrokeStyle {
// FIXME: This should parse color strings the same as CSS
auto color = Gfx::Color::from_string(string);
if (!color.has_value())
dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasFillStrokeStyles: Unsupported canvas fill or stroke style \"{}\". Defaulting to Color::Black.", string);
return color.value_or(Color::Black);
},
[&](auto fill_or_stroke_style) -> CanvasState::FillOrStrokeStyle {
return fill_or_stroke_style;
});
}
void set_fill_style(FillOrStrokeStyleVariant style)
{
// FIXME: 2. If the given value is a CanvasPattern object that is marked as not origin-clean, then set this's origin-clean flag to false.
my_drawing_state().fill_style = to_canvas_state_fill_or_stroke_style(style);
auto& realm = static_cast<IncludingClass&>(*this).realm();
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-fillstyle
style.visit(
// 1. If the given value is a string, then:
[&](String const& string) {
// 1. Let context be this's canvas attribute's value, if that is an element; otherwise null.
auto maybe_parser = CSS::Parser::Parser::create(CSS::Parser::ParsingContext(realm), string);
if (maybe_parser.is_error()) {
dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasFillStrokeStyles: Failed to create CSS parser.");
return;
}
auto parser = maybe_parser.release_value();
// 2. Let parsedValue be the result of parsing the given value with context if non-null.
// FIXME: Parse a color value
// https://drafts.csswg.org/css-color/#parse-a-css-color-value
auto style_value = parser.parse_as_css_value(CSS::PropertyID::Color);
if (style_value && style_value->has_color()) {
auto parsedValue = style_value->to_color(OptionalNone());
// 4. Set this's fill style to parsedValue.
my_drawing_state().fill_style = parsedValue;
} else {
// 3. If parsedValue is failure, then return.
return;
}
// 5. Return.
return;
},
[&](auto fill_or_stroke_style) {
// FIXME: 2. If the given value is a CanvasPattern object that is marked as not origin-clean, then set this's origin-clean flag to false.
// 3. Set this's fill style to the given value.
my_drawing_state().fill_style = fill_or_stroke_style;
});
}
FillOrStrokeStyleVariant fill_style() const
@ -53,8 +72,44 @@ public:
void set_stroke_style(FillOrStrokeStyleVariant style)
{
// FIXME: 2. If the given value is a CanvasPattern object that is marked as not origin-clean, then set this's origin-clean flag to false.
my_drawing_state().stroke_style = to_canvas_state_fill_or_stroke_style(style);
auto& realm = static_cast<IncludingClass&>(*this).realm();
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-strokestyle
style.visit(
// 1. If the given value is a string, then:
[&](String const& string) {
// 1. Let context be this's canvas attribute's value, if that is an element; otherwise null.
auto maybe_parser = CSS::Parser::Parser::create(CSS::Parser::ParsingContext(realm), string);
if (maybe_parser.is_error()) {
dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasFillStrokeStyles: Failed to create CSS parser.");
return;
}
auto parser = maybe_parser.release_value();
// 2. Let parsedValue be the result of parsing the given value with context if non-null.
// FIXME: Parse a color value
// https://drafts.csswg.org/css-color/#parse-a-css-color-value
auto style_value = parser.parse_as_css_value(CSS::PropertyID::Color);
if (style_value && style_value->has_color()) {
auto parsedValue = style_value->to_color(OptionalNone());
// 4. Set this's stroke style to parsedValue.
my_drawing_state().stroke_style = parsedValue;
} else {
// 3. If parsedValue is failure, then return.
return;
}
// 5. Return.
return;
},
[&](auto fill_or_stroke_style) {
// FIXME: 2. If the given value is a CanvasPattern object that is marked as not origin-clean, then set this's origin-clean flag to false.
// 3. Set this's stroke style to the given value.
my_drawing_state().fill_style = fill_or_stroke_style;
});
}
FillOrStrokeStyleVariant stroke_style() const