e181686f7e
The compositor IPC path needs variable-font axes to survive transport with the font data that owns them. Add LibGfx-local specializations for FontVariationSettings, compile the new implementation into LibGfx, and expose the stored settings from Font so later font serializers can read them without reaching into the class internals. This is preparatory work required to add IPC between the main and compositor threads.
85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
/*
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* Copyright (c) 2025, Norbiros <me@norbiros.dev>
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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/HashMap.h>
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#include <AK/QuickSort.h>
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#include <AK/Vector.h>
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#include <LibGfx/FourCC.h>
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#include <LibIPC/Forward.h>
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namespace Gfx {
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struct FontVariationAxis {
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FourCC tag;
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float value;
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FontVariationAxis(FourCC t, float v)
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: tag(t)
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, value(v)
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{
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}
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bool operator==(FontVariationAxis const& other) const
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{
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return tag == other.tag && value == other.value;
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}
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};
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// FIXME: Support other named axes like 'slnt', 'ital', 'opsz', 'GRAD', etc.
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struct FontVariationSettings {
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HashMap<FourCC, float> axes;
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FontVariationSettings() = default;
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// https://learn.microsoft.com/en-us/typography/opentype/spec/dvaraxistag_wght
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void set_weight(float value)
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{
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axes.set(FourCC("wght"), value);
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}
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// https://learn.microsoft.com/en-us/typography/opentype/spec/dvaraxistag_wdth
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void set_width(float value)
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{
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axes.set(FourCC("wdth"), value);
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}
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// https://learn.microsoft.com/en-us/typography/opentype/spec/dvaraxistag_opsz
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void set_optical_sizing(float value)
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{
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axes.set(FourCC("opsz"), value);
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}
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bool is_empty() const { return axes.is_empty(); }
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Vector<FontVariationAxis> to_sorted_list() const
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{
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Vector<FontVariationAxis> list;
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list.ensure_capacity(axes.size());
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for (auto const& entry : axes)
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list.unchecked_append(FontVariationAxis(entry.key, entry.value));
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quick_sort(list, [](auto const& a, auto const& b) {
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return a.tag < b.tag;
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});
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return list;
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}
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};
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}
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namespace IPC {
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template<>
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ErrorOr<void> encode(Encoder&, Gfx::FontVariationSettings const&);
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template<>
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ErrorOr<Gfx::FontVariationSettings> decode(Decoder&);
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}
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