4bf587811f
This PR adds resize ability to PixelPaint as per issue 11862. The previous behaviour was to always rescale the canvas when resizing an image. This adds a checkbox to toggle between rescaling, and resizing which blits the existing canvas to the top left of the new, resized canvas. As part of this, a new ScalingMode is added to LibGfx - None.
352 lines
12 KiB
C++
352 lines
12 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
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* Copyright (c) 2022, Timothy Slater <tslater2006@gmail.com>
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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 <AK/RefPtr.h>
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#include <AK/Try.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Painter.h>
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namespace PixelPaint {
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ErrorOr<NonnullRefPtr<Layer>> Layer::try_create_with_size(Image& image, Gfx::IntSize const& size, String name)
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{
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VERIFY(!size.is_empty());
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if (size.width() > 16384 || size.height() > 16384)
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return Error::from_string_literal("Layer size too large");
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auto bitmap = TRY(Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, size));
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return adopt_nonnull_ref_or_enomem(new (nothrow) Layer(image, move(bitmap), move(name)));
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}
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ErrorOr<NonnullRefPtr<Layer>> Layer::try_create_with_bitmap(Image& image, NonnullRefPtr<Gfx::Bitmap> bitmap, String name)
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{
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VERIFY(!bitmap->size().is_empty());
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if (bitmap->size().width() > 16384 || bitmap->size().height() > 16384)
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return Error::from_string_literal("Layer size too large");
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return adopt_nonnull_ref_or_enomem(new (nothrow) Layer(image, bitmap, move(name)));
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}
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ErrorOr<NonnullRefPtr<Layer>> Layer::try_create_snapshot(Image& image, Layer const& layer)
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{
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auto bitmap = TRY(layer.content_bitmap().clone());
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auto snapshot = TRY(try_create_with_bitmap(image, move(bitmap), 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_content_bitmap(move(bitmap))
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, m_cached_display_bitmap(m_content_bitmap)
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{
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}
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void Layer::did_modify_bitmap(Gfx::IntRect const& rect)
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{
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if (!m_scratch_edited_bitmap.is_null()) {
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for (int y = 0; y < rect.height(); ++y) {
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for (int x = 0; x < rect.width(); ++x) {
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Gfx::IntPoint next_point = { rect.left() + x, rect.top() + y };
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if (!m_scratch_edited_bitmap->rect().contains(next_point))
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continue;
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if (this->image().selection().is_selected(next_point.translated(this->location())))
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currently_edited_bitmap().set_pixel(next_point, m_scratch_edited_bitmap->get_pixel(next_point));
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else
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m_scratch_edited_bitmap->set_pixel(next_point, currently_edited_bitmap().get_pixel(next_point));
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}
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}
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}
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m_image.layer_did_modify_bitmap({}, *this, rect);
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update_cached_bitmap();
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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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Gfx::Bitmap& Layer::get_scratch_edited_bitmap()
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{
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if (this->image().selection().is_empty()) {
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m_scratch_edited_bitmap = nullptr;
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return currently_edited_bitmap();
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}
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if (!m_scratch_edited_bitmap.is_null())
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return *m_scratch_edited_bitmap;
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m_scratch_edited_bitmap = MUST(currently_edited_bitmap().clone());
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return *m_scratch_edited_bitmap;
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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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if (selection.is_empty()) {
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return {};
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}
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auto selection_rect = selection.bounding_rect();
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auto bitmap_or_error = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, selection_rect.size());
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if (bitmap_or_error.is_error())
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return nullptr;
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auto result = bitmap_or_error.release_value_but_fixme_should_propagate_errors();
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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_content_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_content_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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void Layer::erase_selection(Selection const& selection)
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{
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auto const image_and_selection_intersection = m_image.rect().intersected(selection.bounding_rect());
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auto const translated_to_layer_space = image_and_selection_intersection.translated(-location());
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for (int y = translated_to_layer_space.top(); y < translated_to_layer_space.top() + translated_to_layer_space.height(); ++y) {
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for (int x = translated_to_layer_space.left(); x < translated_to_layer_space.left() + translated_to_layer_space.width(); ++x) {
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// Selection is still in pre-translated coordinates, account for this by adding the layer's relative location
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if (content_bitmap().rect().contains(x, y) && selection.is_selected(x + location().x(), y + location().y())) {
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content_bitmap().set_pixel(x, y, Color::Transparent);
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}
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}
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}
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did_modify_bitmap(translated_to_layer_space);
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}
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ErrorOr<void> Layer::try_set_bitmaps(NonnullRefPtr<Gfx::Bitmap> content, RefPtr<Gfx::Bitmap> mask)
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{
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if (mask && content->size() != mask->size())
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return Error::from_string_literal("Layer content and mask must be same size");
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m_content_bitmap = move(content);
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m_mask_bitmap = move(mask);
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m_scratch_edited_bitmap = nullptr;
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update_cached_bitmap();
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return {};
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}
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void Layer::flip(Gfx::Orientation orientation)
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{
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m_content_bitmap = *m_content_bitmap->flipped(orientation).release_value_but_fixme_should_propagate_errors();
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if (m_mask_bitmap)
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m_mask_bitmap = *m_mask_bitmap->flipped(orientation).release_value_but_fixme_should_propagate_errors();
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did_modify_bitmap();
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}
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void Layer::rotate(Gfx::RotationDirection direction)
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{
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m_content_bitmap = *m_content_bitmap->rotated(direction).release_value_but_fixme_should_propagate_errors();
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if (m_mask_bitmap)
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m_mask_bitmap = *m_mask_bitmap->rotated(direction).release_value_but_fixme_should_propagate_errors();
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did_modify_bitmap();
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}
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void Layer::crop(Gfx::IntRect const& rect)
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{
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m_content_bitmap = *m_content_bitmap->cropped(rect).release_value_but_fixme_should_propagate_errors();
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if (m_mask_bitmap)
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m_mask_bitmap = *m_mask_bitmap->cropped(rect).release_value_but_fixme_should_propagate_errors();
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did_modify_bitmap();
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}
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void Layer::resize(Gfx::IntSize const& new_size, Gfx::IntPoint const& new_location, Gfx::Painter::ScalingMode scaling_mode)
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{
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auto src_rect = Gfx::IntRect(Gfx::IntPoint(0, 0), size());
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auto dst_rect = Gfx::IntRect(Gfx::IntPoint(0, 0), new_size);
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{
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auto dst = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, new_size).release_value_but_fixme_should_propagate_errors();
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Gfx::Painter painter(dst);
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if (scaling_mode == Gfx::Painter::ScalingMode::None) {
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painter.blit(src_rect.top_left(), *m_content_bitmap, src_rect, 1.0f);
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} else {
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painter.draw_scaled_bitmap(dst_rect, *m_content_bitmap, src_rect, 1.0f, scaling_mode);
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}
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m_content_bitmap = move(dst);
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}
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if (m_mask_bitmap) {
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auto dst = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, new_size).release_value_but_fixme_should_propagate_errors();
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Gfx::Painter painter(dst);
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if (scaling_mode == Gfx::Painter::ScalingMode::None) {
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painter.blit(src_rect.top_left(), *m_content_bitmap, src_rect, 1.0f);
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} else {
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painter.draw_scaled_bitmap(dst_rect, *m_mask_bitmap, src_rect, 1.0f, scaling_mode);
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}
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m_mask_bitmap = move(dst);
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}
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set_location(new_location);
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did_modify_bitmap();
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}
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void Layer::resize(Gfx::IntRect const& new_rect, Gfx::Painter::ScalingMode scaling_mode)
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{
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resize(new_rect.size(), new_rect.location(), scaling_mode);
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}
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void Layer::resize(Gfx::IntSize const& new_size, Gfx::Painter::ScalingMode scaling_mode)
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{
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resize(new_size, location(), scaling_mode);
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}
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void Layer::update_cached_bitmap()
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{
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if (!is_masked()) {
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if (m_content_bitmap.ptr() == m_cached_display_bitmap.ptr())
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return;
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m_cached_display_bitmap = m_content_bitmap;
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return;
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}
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if (m_cached_display_bitmap.ptr() == m_content_bitmap.ptr() || m_cached_display_bitmap->size() != size()) {
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m_cached_display_bitmap = MUST(Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, size()));
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}
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// FIXME: This can probably be done nicer
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m_cached_display_bitmap->fill(Color::Transparent);
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for (int y = 0; y < size().height(); ++y) {
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for (int x = 0; x < size().width(); ++x) {
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auto opacity_multiplier = (float)m_mask_bitmap->get_pixel(x, y).to_grayscale().red() / 255;
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auto content_color = m_content_bitmap->get_pixel(x, y);
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content_color.set_alpha(content_color.alpha() * opacity_multiplier);
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m_cached_display_bitmap->set_pixel(x, y, content_color);
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}
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}
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}
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void Layer::create_mask()
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{
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m_mask_bitmap = MUST(Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRx8888, size()));
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m_mask_bitmap->fill(Gfx::Color::White);
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update_cached_bitmap();
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}
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Gfx::Bitmap& Layer::currently_edited_bitmap()
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{
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switch (edit_mode()) {
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case EditMode::Mask:
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if (is_masked())
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return *mask_bitmap();
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[[fallthrough]];
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case EditMode::Content:
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return content_bitmap();
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}
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VERIFY_NOT_REACHED();
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}
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void Layer::set_edit_mode(Layer::EditMode mode)
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{
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if (m_edit_mode == mode)
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return;
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m_scratch_edited_bitmap = nullptr;
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m_edit_mode = mode;
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}
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Optional<Gfx::IntRect> Layer::nonempty_content_bounding_rect() const
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{
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Optional<int> min_content_y;
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Optional<int> min_content_x;
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Optional<int> max_content_y;
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Optional<int> max_content_x;
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for (int y = 0; y < m_content_bitmap->height(); ++y) {
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for (int x = 0; x < m_content_bitmap->width(); ++x) {
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auto color = m_content_bitmap->get_pixel(x, y);
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if (color.alpha() == 0)
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continue;
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min_content_x = min(min_content_x.value_or(x), x);
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min_content_y = min(min_content_y.value_or(y), y);
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max_content_x = max(max_content_x.value_or(x), x);
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max_content_y = max(max_content_y.value_or(y), y);
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}
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}
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if (!min_content_x.has_value())
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return {};
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return Gfx::IntRect {
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*min_content_x,
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*min_content_y,
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*max_content_x - *min_content_x + 1,
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*max_content_y - *min_content_y + 1
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};
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}
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}
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