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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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4
Applications/PaintBrush/PaintableWidget.cpp
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@ -1,6 +1,7 @@
#include "PaintableWidget.h"
#include "Tool.h"
#include <LibDraw/GraphicsBitmap.h>
#include <LibDraw/Palette.h>
#include <LibGUI/GPainter.h>
static PaintableWidget* s_the;
@ -16,6 +17,9 @@ PaintableWidget::PaintableWidget(GWidget* parent)
ASSERT(!s_the);
s_the = this;
set_fill_with_background_color(true);
auto pal = palette();
pal.set_color(ColorRole::Window, Color::MidGray);
set_palette(pal);
set_background_color(Color::MidGray);
m_bitmap = GraphicsBitmap::create(GraphicsBitmap::Format::RGB32, { 600, 400 });
m_bitmap->fill(Color::White);