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49500ac386
Factor out canvas serialization algorihtm from HTMLCanvasElement to seperate file. This makes it usable by other things too.
36 lines
1.7 KiB
C++
36 lines
1.7 KiB
C++
/*
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* Copyright (c) 2025, Ladybird contributors
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/MemoryStream.h>
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#include <LibGfx/ImageFormats/JPEGWriter.h>
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#include <LibGfx/ImageFormats/PNGWriter.h>
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#include <LibWeb/HTML/Canvas/SerializeBitmap.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/canvas.html#a-serialisation-of-the-bitmap-as-a-file
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ErrorOr<SerializeBitmapResult> serialize_bitmap(Gfx::Bitmap const& bitmap, StringView type, Optional<double> quality)
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{
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// If type is an image format that supports variable quality (such as "image/jpeg"), quality is given, and type is not "image/png", then,
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// if quality is a Number in the range 0.0 to 1.0 inclusive, the user agent must treat quality as the desired quality level.
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// Otherwise, the user agent must use its default quality value, as if the quality argument had not been given.
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bool valid_quality = quality.has_value() and quality.value() >= 0.0 && quality.value() <= 1.0;
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if (type.equals_ignoring_ascii_case("image/jpeg"sv)) {
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AllocatingMemoryStream file;
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Gfx::JPEGWriter::Options jpeg_options;
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if (valid_quality)
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jpeg_options.quality = static_cast<int>(quality.value() * 100);
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TRY(Gfx::JPEGWriter::encode(file, bitmap, jpeg_options));
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return SerializeBitmapResult { TRY(file.read_until_eof()), "image/jpeg"sv };
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}
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// User agents must support PNG ("image/png"). User agents may support other types.
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// If the user agent does not support the requested type, then it must create the file using the PNG format. [PNG]
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return SerializeBitmapResult { TRY(Gfx::PNGWriter::encode(bitmap)), "image/png"sv };
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}
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}
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