20b2c46019
This replaces the naive copy algorithm that only supported rectangular and 100% opaque selections with a more general approach that supports any shape and alpha value. Note that we now make a brand new bitmap with a hardcoded format instead of just cropping the layer's existing bitmap. This is done to ensure that the final clipboard image will have an alpha channel.
127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@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 "Layer.h"
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#include "Image.h"
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#include "Selection.h"
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#include <LibGfx/Bitmap.h>
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namespace PixelPaint {
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RefPtr<Layer> Layer::try_create_with_size(Image& image, Gfx::IntSize const& size, String name)
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{
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if (size.is_empty())
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return nullptr;
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if (size.width() > 16384 || size.height() > 16384)
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return nullptr;
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auto bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, size);
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if (!bitmap)
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return nullptr;
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return adopt_ref(*new Layer(image, *bitmap, move(name)));
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}
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RefPtr<Layer> Layer::try_create_with_bitmap(Image& image, NonnullRefPtr<Gfx::Bitmap> bitmap, String name)
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{
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if (bitmap->size().is_empty())
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return nullptr;
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if (bitmap->size().width() > 16384 || bitmap->size().height() > 16384)
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return nullptr;
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return adopt_ref(*new Layer(image, bitmap, move(name)));
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}
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RefPtr<Layer> Layer::try_create_snapshot(Image& image, Layer const& layer)
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{
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auto snapshot = try_create_with_bitmap(image, *layer.bitmap().clone(), layer.name());
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/*
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We set these properties directly because calling the setters might
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notify the image of an update on the newly created layer, but this
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layer has not yet been added to the image.
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*/
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snapshot->m_opacity_percent = layer.opacity_percent();
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snapshot->m_visible = layer.is_visible();
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snapshot->set_selected(layer.is_selected());
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snapshot->set_location(layer.location());
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return snapshot;
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}
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Layer::Layer(Image& image, NonnullRefPtr<Gfx::Bitmap> bitmap, String name)
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: m_image(image)
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, m_name(move(name))
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, m_bitmap(move(bitmap))
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{
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}
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void Layer::did_modify_bitmap()
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{
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m_image.layer_did_modify_bitmap({}, *this);
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}
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void Layer::set_visible(bool visible)
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{
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if (m_visible == visible)
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return;
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m_visible = visible;
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m_image.layer_did_modify_properties({}, *this);
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}
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void Layer::set_opacity_percent(int opacity_percent)
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{
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if (m_opacity_percent == opacity_percent)
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return;
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m_opacity_percent = opacity_percent;
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m_image.layer_did_modify_properties({}, *this);
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}
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void Layer::set_name(String name)
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{
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if (m_name == name)
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return;
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m_name = move(name);
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m_image.layer_did_modify_properties({}, *this);
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}
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RefPtr<Gfx::Bitmap> Layer::try_copy_bitmap(Selection const& selection) const
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{
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auto selection_rect = selection.bounding_rect();
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auto result = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, selection_rect.size());
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VERIFY(result->has_alpha_channel());
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for (int y = selection_rect.top(); y <= selection_rect.bottom(); y++) {
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for (int x = selection_rect.left(); x <= selection_rect.right(); x++) {
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Gfx::IntPoint image_point { x, y };
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auto layer_point = image_point - m_location;
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auto result_point = image_point - selection_rect.top_left();
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if (!m_bitmap->physical_rect().contains(layer_point)) {
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result->set_pixel(result_point, Gfx::Color::Transparent);
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continue;
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}
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auto pixel = m_bitmap->get_pixel(layer_point);
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// Widen to int before multiplying to avoid overflow issues
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auto pixel_alpha = static_cast<int>(pixel.alpha());
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auto selection_alpha = static_cast<int>(selection.get_selection_alpha(image_point));
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auto new_alpha = (pixel_alpha * selection_alpha) / 0xFF;
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pixel.set_alpha(static_cast<u8>(clamp(new_alpha, 0, 0xFF)));
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result->set_pixel(result_point, pixel);
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}
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}
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return result;
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}
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}
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