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AK: Remove Statistics.h
This also removes MedianCut and GIFWriter
This commit is contained in:
Pavel Shliak
Alexander Kalenik
parent
ae6edfb845
commit
ede0dbafc6
Notes:
github-actions[bot]
2024-12-05 15:54:23 +00:00
Author: https://github.com/shlyakpavel
Commit: ede0dbafc6
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2772
13 changed files with 0 additions and 845 deletions
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/*
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* Copyright (c) 2024, Lucas Chollet <lucas.chollet@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/BitStream.h>
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#include <LibCompress/Lzw.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/ImageFormats/GIFWriter.h>
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#include <LibGfx/MedianCut.h>
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namespace Gfx {
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namespace {
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ErrorOr<void> write_header(Stream& stream)
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{
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// 17. Header
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TRY(stream.write_until_depleted("GIF89a"sv));
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return {};
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}
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ErrorOr<void> write_logical_descriptor(BigEndianOutputBitStream& stream, IntSize size)
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{
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// 18. Logical Screen Descriptor
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if (size.width() > NumericLimits<u16>::max() || size.height() > NumericLimits<u16>::max())
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return Error::from_string_literal("Bitmap size is too big for a GIF");
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TRY(stream.write_value<u16>(size.width()));
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TRY(stream.write_value<u16>(size.height()));
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// Global Color Table Flag
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TRY(stream.write_bits(false, 1));
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// Color Resolution
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TRY(stream.write_bits(6u, 3));
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// Sort Flag
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TRY(stream.write_bits(false, 1));
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// Size of Global Color Table
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TRY(stream.write_bits(0u, 3));
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// Background Color Index
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TRY(stream.write_value<u8>(0));
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// Pixel Aspect Ratio
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// NOTE: We can write a zero as most decoders discard the value.
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TRY(stream.write_value<u8>(0));
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return {};
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}
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ErrorOr<void> write_color_table(Stream& stream, ColorPalette const& palette)
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{
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// 19. Global Color Table or 21. Local Color Table.
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for (u16 i = 0; i < 256; ++i) {
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auto const color = i < palette.palette().size() ? palette.palette()[i] : Color::NamedColor::White;
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TRY(stream.write_value<u8>(color.red()));
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TRY(stream.write_value<u8>(color.green()));
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TRY(stream.write_value<u8>(color.blue()));
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}
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return {};
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}
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ErrorOr<void> write_image_data(Stream& stream, Bitmap const& bitmap, ColorPalette const& palette)
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{
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// 22. Table Based Image Data
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auto const pixel_number = static_cast<u32>(bitmap.width() * bitmap.height());
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auto indexes = TRY(ByteBuffer::create_uninitialized(pixel_number));
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for (u32 i = 0; i < pixel_number; ++i) {
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auto const color = Color::from_argb(*(bitmap.begin() + i));
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indexes[i] = palette.index_of_closest_color(color);
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}
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constexpr u8 lzw_minimum_code_size = 8;
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auto const encoded = TRY(Compress::LzwCompressor::compress_all(move(indexes), lzw_minimum_code_size));
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auto const number_of_subblocks = ceil_div(encoded.size(), 255ul);
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TRY(stream.write_value<u8>(lzw_minimum_code_size));
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for (u32 i = 0; i < number_of_subblocks; ++i) {
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auto const offset = i * 255;
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auto const to_write = min(255, encoded.size() - offset);
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TRY(stream.write_value<u8>(to_write));
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TRY(stream.write_until_depleted(encoded.bytes().slice(offset, to_write)));
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}
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// Block terminator
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TRY(stream.write_value<u8>(0));
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return {};
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}
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ErrorOr<void> write_image_descriptor(BigEndianOutputBitStream& stream, Bitmap const& bitmap, IntPoint at = {})
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{
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// 20. Image Descriptor
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// Image Separator
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TRY(stream.write_value<u8>(0x2c));
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// Image Left Position
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TRY(stream.write_value<u16>(at.x()));
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// Image Top Position
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TRY(stream.write_value<u16>(at.y()));
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// Image Width
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TRY(stream.write_value<u16>(bitmap.width()));
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// Image Height
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TRY(stream.write_value<u16>(bitmap.height()));
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// Local Color Table Flag
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TRY(stream.write_bits(true, 1));
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// Interlace Flag
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TRY(stream.write_bits(false, 1));
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// Sort Flag
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TRY(stream.write_bits(false, 1));
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// Reserved
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TRY(stream.write_bits(0u, 2));
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// Size of Local Color Table
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TRY(stream.write_bits(7u, 3));
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return {};
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}
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ErrorOr<void> write_graphic_control_extension(BigEndianOutputBitStream& stream, int duration_ms)
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{
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// 23. Graphic Control Extension
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// Extension Introducer
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TRY(stream.write_value<u8>(0x21));
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// Graphic Control Label
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TRY(stream.write_value<u8>(0xF9));
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// Block Size
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TRY(stream.write_value<u8>(4));
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// Packed Field
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// Reserved
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TRY(stream.write_bits(0u, 3));
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// Disposal Method
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TRY(stream.write_bits(0u, 3));
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// User Input Flag
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TRY(stream.write_bits(false, 1));
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// Transparency Flag
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TRY(stream.write_bits(false, 1));
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// Delay Time
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TRY(stream.write_value<u16>(duration_ms / 10));
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// Transparent Color Index
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TRY(stream.write_value<u8>(0));
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// Block Terminator
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TRY(stream.write_value<u8>(0));
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return {};
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}
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ErrorOr<void> write_trailer(Stream& stream)
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{
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TRY(stream.write_value<u8>(0x3B));
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return {};
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}
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class GIFAnimationWriter : public AnimationWriter {
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public:
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GIFAnimationWriter(SeekableStream& stream)
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: m_stream(stream)
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{
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}
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virtual ErrorOr<void> add_frame(Bitmap&, int, IntPoint) override;
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private:
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SeekableStream& m_stream;
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bool m_is_first_frame { true };
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};
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ErrorOr<void> GIFAnimationWriter::add_frame(Bitmap& bitmap, int duration_ms, IntPoint at = {})
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{
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// Let's get rid of the previously written trailer
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if (!m_is_first_frame)
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TRY(m_stream.seek(-1, SeekMode::FromCurrentPosition));
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m_is_first_frame = false;
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// Write a Table-Based Image
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BigEndianOutputBitStream bit_stream { MaybeOwned { m_stream } };
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TRY(write_graphic_control_extension(bit_stream, duration_ms));
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TRY(write_image_descriptor(bit_stream, bitmap, at));
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auto const palette = TRY(median_cut(bitmap, 256));
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TRY(write_color_table(m_stream, palette));
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TRY(write_image_data(m_stream, bitmap, palette));
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// We always write a trailer to ensure that the file is valid.
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TRY(write_trailer(m_stream));
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return {};
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}
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ErrorOr<void> write_netscape_extension(BigEndianOutputBitStream& stream, u16 loop_count)
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{
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// This is a vendor extension, its sole usage is to provide the loop count.
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// I used this link as a source: https://web.archive.org/web/19990418091037/http://www6.uniovi.es/gifanim/gifabout.htm
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// Extension Introducer
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TRY(stream.write_value<u8>(0x21));
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// Application Extension Label
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TRY(stream.write_value<u8>(0xFF));
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// Block Size
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constexpr auto netscape_signature = "NETSCAPE2.0"sv;
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TRY(stream.write_value<u8>(netscape_signature.length()));
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TRY(stream.write_until_depleted(netscape_signature));
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// Length of Data Sub-Block
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TRY(stream.write_value<u8>(3));
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// Undocumented
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TRY(stream.write_value<u8>(1));
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// Number of loops, 0 means infinite
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TRY(stream.write_value<u16>(loop_count));
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// Block Terminator
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TRY(stream.write_value<u8>(0));
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return {};
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}
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}
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ErrorOr<void> GIFWriter::encode(Stream& stream, Bitmap const& bitmap)
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{
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auto const palette = TRY(median_cut(bitmap, 256));
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TRY(write_header(stream));
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BigEndianOutputBitStream bit_stream { MaybeOwned<Stream> { stream } };
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TRY(write_logical_descriptor(bit_stream, bitmap.size()));
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// Write a Table-Based Image
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TRY(write_image_descriptor(bit_stream, bitmap));
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TRY(write_color_table(bit_stream, palette));
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TRY(write_image_data(stream, bitmap, palette));
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TRY(write_trailer(bit_stream));
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return {};
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}
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ErrorOr<NonnullOwnPtr<AnimationWriter>> GIFWriter::start_encoding_animation(SeekableStream& stream, IntSize dimensions, u16 loop_count)
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{
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TRY(write_header(stream));
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BigEndianOutputBitStream bit_stream { MaybeOwned<Stream> { stream } };
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TRY(write_logical_descriptor(bit_stream, dimensions));
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// Vendor extension to support looping
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TRY(write_netscape_extension(bit_stream, loop_count));
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return make<GIFAnimationWriter>(stream);
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}
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}
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@ -1,23 +0,0 @@
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/*
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* Copyright (c) 2024, Lucas Chollet <lucas.chollet@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Error.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/ImageFormats/AnimationWriter.h>
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namespace Gfx {
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// Specified at: https://www.w3.org/Graphics/GIF/spec-gif89a.txt
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class GIFWriter {
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public:
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static ErrorOr<void> encode(Stream&, Bitmap const&);
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static ErrorOr<NonnullOwnPtr<AnimationWriter>> start_encoding_animation(SeekableStream&, IntSize dimensions, u16 loop_count);
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};
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}
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