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LibDraw+LibGUI: Allow changing individual colors in a Palette

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Palette is now a value wrapper around a NonnullRefPtr<PaletteImpl>.
A new function, set_color(ColorRole, Color) implements a simple
copy-on-write mechanism so that we're sharing the PaletteImpl in the
common case, but allowing you to create custom palettes if you like,
by getting a GWidget's palette, modifying it, and then assigning the
modified palette to the widget via GWidget::set_palette().

Use this to make PaintBrush show its palette colors once again.

Fixes #943.
This commit is contained in:
Andreas Kling 2019-12-29 00:47:49 +01:00
parent 19d4f4c7b5
commit 7b2dd7e116
18 changed files with 98 additions and 40 deletions
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30
Libraries/LibDraw/Palette.cpp
View file

@ -1,26 +1,46 @@
#include <LibDraw/Palette.h>
NonnullRefPtr<Palette> Palette::create_with_shared_buffer(SharedBuffer& buffer)
NonnullRefPtr<PaletteImpl> PaletteImpl::create_with_shared_buffer(SharedBuffer& buffer)
{
return adopt(*new Palette(buffer));
return adopt(*new PaletteImpl(buffer));
}
Palette::Palette(SharedBuffer& buffer)
PaletteImpl::PaletteImpl(SharedBuffer& buffer)
: m_theme_buffer(buffer)
{
}
Palette::Palette(const PaletteImpl& impl)
: m_impl(impl)
{
}
Palette::~Palette()
{
}
const SystemTheme& Palette::theme() const
const SystemTheme& PaletteImpl::theme() const
{
return *(const SystemTheme*)m_theme_buffer->data();
}
Color Palette::color(ColorRole role) const
Color PaletteImpl::color(ColorRole role) const
{
ASSERT((int)role < (int)ColorRole::__Count);
return theme().color[(int)role];
}
NonnullRefPtr<PaletteImpl> PaletteImpl::clone() const
{
auto new_theme_buffer = SharedBuffer::create_with_size(m_theme_buffer->size());
memcpy(new_theme_buffer->data(), m_theme_buffer->data(), m_theme_buffer->size());
return adopt(*new PaletteImpl(*new_theme_buffer));
}
void Palette::set_color(ColorRole role, Color color)
{
if (m_impl->ref_count() != 1)
m_impl = m_impl->clone();
auto& theme = const_cast<SystemTheme&>(impl().theme());
theme.color[(int)role] = color;
}