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PixelPaint: Add grayscale filter

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Add a new Color category to the Filter menu. Add the Grayscale
filter under Filter->Color to turn the selected layer to grey colors.
Created GrayscaleFilter.h. Modify Filter.h to allow filters
without parameters.
This commit is contained in:
savary1 2021-08-26 23:37:44 +02:00 • committed by Andreas Kling
parent fdc9ff2ee7
commit dd912bd351
4 changed files with 60 additions and 1 deletions
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3
Userland/Libraries/LibGfx/Filters/Filter.h
View file

@ -23,7 +23,8 @@ public:
virtual const char* class_name() const = 0;
virtual void apply(Bitmap&, const IntRect&, const Bitmap&, const IntRect&, const Parameters&) = 0;
virtual void apply(Bitmap&, IntRect const&, Bitmap const&, IntRect const&, Parameters const&) {};
virtual void apply(Bitmap&, IntRect const&, Bitmap const&, IntRect const&) {};
protected:
Filter() { }

45
Userland/Libraries/LibGfx/Filters/GrayscaleFilter.h Normal file
View file

@ -0,0 +1,45 @@
/*
* Copyright (c) 2021, David Savary <david.savarymartinez@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibGfx/Filters/Filter.h>
namespace Gfx {
class GrayscaleFilter : public Filter {
public:
GrayscaleFilter() { }
virtual ~GrayscaleFilter() { }
virtual char const* class_name() const override { return "GrayscaleFilter"; }
virtual void apply(Bitmap& target_bitmap, IntRect const& target_rect, Bitmap const& source_bitmap, IntRect const& source_rect) override
{
// source_rect should be describing the pixels that can be accessed
// to apply this filter, while target_rect should describe the area
// where to apply the filter on.
VERIFY(source_rect.size() == target_rect.size());
VERIFY(target_bitmap.rect().contains(target_rect));
VERIFY(source_bitmap.rect().contains(source_rect));
for (auto y = 0; y < source_rect.height(); ++y) {
ssize_t source_y = y + source_rect.y();
ssize_t target_y = y + target_rect.y();
for (auto x = 0; x < source_rect.width(); ++x) {
ssize_t source_x = x + source_rect.x();
ssize_t target_x = x + target_rect.x();
auto source_pixel = source_bitmap.get_pixel(source_x, source_y);
auto target_color = source_pixel.to_grayscale();
target_bitmap.set_pixel(target_x, target_y, target_color);
}
}
}
};
}