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LibWeb: Create canvas bitmap when not existing in toDataURL and toBlob

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Bastiaan van der Plaat 2023-09-16 22:00:37 +02:00 • committed by Andreas Kling
parent d24e07579f
commit 5e7a82a853
5 changed files with 34 additions and 3 deletions
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1
Tests/LibWeb/Text/expected/canvas/export.txt Normal file
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@ -0,0 +1 @@
1. "image/png"

22
Tests/LibWeb/Text/input/canvas/export.html Normal file
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@ -0,0 +1,22 @@
<script src="../include.js"></script>
<script>
test(() => {
let testCounter = 1;
function testPart(part) {
println(`${testCounter++}. ${JSON.stringify(part())}`);
}
// 1. Export a canvas to PNG data URL
testPart(() => {
const canvas = document.createElement('canvas');
return canvas.toDataURL('image/png').substring(5, 14);
});
// 2. Export a canvas to JPEG data URL
// FIXME: This fails on macOS: https://github.com/SerenityOS/serenity/issues/21108
// testPart(() => {
// const canvas = document.createElement('canvas');
// return canvas.toDataURL('image/jpeg').substring(5, 15);
// });
});
</script>

10
Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
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@ -246,8 +246,12 @@ static ErrorOr<SerializeBitmapResult> serialize_bitmap(Gfx::Bitmap const& bitmap
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-canvas-todataurl
String HTMLCanvasElement::to_data_url(StringView type, Optional<double> quality) const
String HTMLCanvasElement::to_data_url(StringView type, Optional<double> quality)
{
// It is possible the the canvas doesn't have a associated bitmap so create one
if (!bitmap())
create_bitmap();
// FIXME: 1. If this canvas element's bitmap's origin-clean flag is set to false, then throw a "SecurityError" DOMException.
// 2. If this canvas element's bitmap has no pixels (i.e. either its horizontal dimension or its vertical dimension is zero)
@ -275,6 +279,10 @@ String HTMLCanvasElement::to_data_url(StringView type, Optional<double> quality)
// https://html.spec.whatwg.org/multipage/canvas.html#dom-canvas-toblob
WebIDL::ExceptionOr<void> HTMLCanvasElement::to_blob(JS::NonnullGCPtr<WebIDL::CallbackType> callback, StringView type, Optional<double> quality)
{
// It is possible the the canvas doesn't have a associated bitmap so create one
if (!bitmap())
create_bitmap();
// FIXME: 1. If this canvas element's bitmap's origin-clean flag is set to false, then throw a "SecurityError" DOMException.
// 2. Let result be null.

2
Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
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@ -33,7 +33,7 @@ public:
WebIDL::ExceptionOr<void> set_width(unsigned);
WebIDL::ExceptionOr<void> set_height(unsigned);
String to_data_url(StringView type, Optional<double> quality) const;
String to_data_url(StringView type, Optional<double> quality);
WebIDL::ExceptionOr<void> to_blob(JS::NonnullGCPtr<WebIDL::CallbackType> callback, StringView type, Optional<double> quality);
void present();

2
Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp
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@ -24,7 +24,7 @@
namespace Web::WebDriver {
// https://w3c.github.io/webdriver/#dfn-encoding-a-canvas-as-base64
static Response encode_canvas_element(HTML::HTMLCanvasElement const& canvas)
static Response encode_canvas_element(HTML::HTMLCanvasElement& canvas)
{
// FIXME: 1. If the canvas element’s bitmap’s origin-clean flag is set to false, return error with error code unable to capture screen.