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LibWeb: Add basic support for HTMLCanvasElement.toDataURL() :^)

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This allows you to serialize a <canvas> element's bitmap into a
data: URI. Pretty neat! :^)
This commit is contained in:
Andreas Kling 2021-04-19 23:47:29 +02:00
parent 6793574003
commit 955eef83b0
Notes: sideshowbarker 2024-07-18 19:22:07 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/955eef83b01
3 changed files with 16 additions and 0 deletions
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12
Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
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@ -24,8 +24,10 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Base64.h>
#include <AK/Checked.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/PNGWriter.h>
#include <LibWeb/CSS/StyleResolver.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/CanvasRenderingContext2D.h>
@ -102,4 +104,14 @@ bool HTMLCanvasElement::create_bitmap()
return m_bitmap;
}
String HTMLCanvasElement::to_data_url(const String& type, [[maybe_unused]] Optional<double> quality) const
{
if (!m_bitmap)
return {};
if (type != "image/png")
return {};
auto encoded_bitmap = Gfx::PNGWriter::encode(*m_bitmap);
return URL::create_with_data(type, encode_base64(encoded_bitmap), true).to_string();
}
}

2
Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
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@ -48,6 +48,8 @@ public:
unsigned width() const;
unsigned height() const;
String to_data_url(const String& type, Optional<double> quality) const;
private:
virtual RefPtr<Layout::Node> create_layout_node() override;

2
Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.idl
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@ -4,4 +4,6 @@ interface HTMLCanvasElement : HTMLElement {
readonly attribute unsigned long width;
readonly attribute unsigned long height;
USVString toDataURL(optional DOMString type = "image/png", optional double quality);
};