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LibGfx: Allow specifying a separate source bitmap for Filter::apply

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By allowing to specify a separate source bitmap when calling Filter::apply
the same filter can be applied to multiple areas, and also doesn't need
to use a temporary bitmap. This also enables us to apply the filter to
multiple regions properly, even if they are (almost) adjacent.

If no separate source bitmap is supplied then a temporary bitmap is still
necessary.
This commit is contained in:
Tom 2020-10-04 11:37:17 -06:00 committed by Andreas Kling
parent 6ad6c4ffad
commit 95434d70ed
Notes: sideshowbarker 2024-07-19 01:55:09 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/95434d70ed7
Pull-request: https://github.com/SerenityOS/serenity/pull/3751
3 changed files with 53 additions and 28 deletions
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16
Applications/PixelPaint/main.cpp
View File

@ -220,14 +220,14 @@ int main(int argc, char** argv)
if (auto* layer = image_editor.active_layer()) {
Gfx::LaplacianFilter filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::LaplacianFilter>::get(false))
filter.apply(layer->bitmap(), layer->rect(), *parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));
edge_detect_submenu.add_action(GUI::Action::create("Laplacian (diagonal)", [&](auto&) {
if (auto* layer = image_editor.active_layer()) {
Gfx::LaplacianFilter filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::LaplacianFilter>::get(true))
filter.apply(layer->bitmap(), layer->rect(), *parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));
auto& blur_submenu = spatial_filters_menu.add_submenu("Blur and Sharpen");
@ -235,35 +235,35 @@ int main(int argc, char** argv)
if (auto* layer = image_editor.active_layer()) {
Gfx::SpatialGaussianBlurFilter<3> filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::SpatialGaussianBlurFilter<3>>::get())
filter.apply(layer->bitmap(), layer->rect(), *parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));
blur_submenu.add_action(GUI::Action::create("Gaussian Blur (5x5)", [&](auto&) {
if (auto* layer = image_editor.active_layer()) {
Gfx::SpatialGaussianBlurFilter<5> filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::SpatialGaussianBlurFilter<5>>::get())
filter.apply(layer->bitmap(), layer->rect(), *parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));
blur_submenu.add_action(GUI::Action::create("Box Blur (3x3)", [&](auto&) {
if (auto* layer = image_editor.active_layer()) {
Gfx::BoxBlurFilter<3> filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::BoxBlurFilter<3>>::get())
filter.apply(layer->bitmap(), layer->rect(), *parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));
blur_submenu.add_action(GUI::Action::create("Box Blur (5x5)", [&](auto&) {
if (auto* layer = image_editor.active_layer()) {
Gfx::BoxBlurFilter<5> filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::BoxBlurFilter<5>>::get())
filter.apply(layer->bitmap(), layer->rect(), *parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));
blur_submenu.add_action(GUI::Action::create("Sharpen", [&](auto&) {
if (auto* layer = image_editor.active_layer()) {
Gfx::SharpenFilter filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::SharpenFilter>::get())
filter.apply(layer->bitmap(), layer->rect(),*parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));
@ -272,7 +272,7 @@ int main(int argc, char** argv)
if (auto* layer = image_editor.active_layer()) {
Gfx::GenericConvolutionFilter<5> filter;
if (auto parameters = PixelPaint::FilterParameters<Gfx::GenericConvolutionFilter<5>>::get(window))
filter.apply(layer->bitmap(), layer->rect(),*parameters);
filter.apply(layer->bitmap(), layer->rect(), layer->bitmap(), layer->rect(), *parameters);
}
}));

2
Libraries/LibGfx/Filters/Filter.h
View File

@ -43,7 +43,7 @@ public:
virtual const char* class_name() const = 0;
virtual void apply(Bitmap&, const IntRect&, const Parameters&) = 0;
virtual void apply(Bitmap&, const IntRect&, const Bitmap&, const IntRect&, const Parameters&) = 0;
protected:
Filter() { }

63
Libraries/LibGfx/Filters/GenericConvolutionFilter.h
View File

@ -82,40 +82,63 @@ public:
virtual const char* class_name() const override { return "GenericConvolutionFilter"; }
virtual void apply(Bitmap& bitmap, const IntRect& rect, const Filter::Parameters& parameters) override
virtual void apply(Bitmap& target_bitmap, const IntRect& target_rect, const Bitmap& source_bitmap, const IntRect& source_rect, const Filter::Parameters& parameters) override
{
ASSERT(parameters.is_generic_convolution_filter());
auto& gcf_params = static_cast<const GenericConvolutionFilter::Parameters&>(parameters);
ApplyCache apply_cache;
apply(bitmap, rect, gcf_params, apply_cache);
apply(target_bitmap, target_rect, source_bitmap, source_rect, gcf_params, apply_cache);
}
void apply(Bitmap& source, const IntRect& source_rect, const GenericConvolutionFilter::Parameters& parameters, ApplyCache& apply_cache)
void apply(Bitmap& target, IntRect target_rect, const Bitmap& source, const IntRect& source_rect, const GenericConvolutionFilter::Parameters& parameters, ApplyCache& apply_cache)
{
if (!apply_cache.m_target || !apply_cache.m_target->size().contains(source_rect.size()))
// The target area (where the filter is applied) must be entirely
// contained by the source area. 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.
ASSERT(source_rect.contains(target_rect));
ASSERT(source.size().contains(target.size()));
ASSERT(target.rect().contains(target_rect));
ASSERT(source.rect().contains(source_rect));
// If source is different from target, it should still be describing
// essentially the same bitmap. But it allows us to modify target
// without a temporary bitmap. This is important if this filter
// is applied on multiple areas of the same bitmap, at which point
// we would need to be able to access unmodified pixels if the
// areas are (almost) adjacent.
int source_delta_x = target_rect.x() - source_rect.x();
int source_delta_y = target_rect.y() - source_rect.y();
if (&target == &source && (!apply_cache.m_target || !apply_cache.m_target->size().contains(source_rect.size()))) {
// TODO: We probably don't need the entire source_rect, we could inflate
// the target_rect appropriately
apply_cache.m_target = Gfx::Bitmap::create(source.format(), source_rect.size());
target_rect.move_by(-target_rect.location());
}
Bitmap* render_target_bitmap = (&target != &source) ? &target : apply_cache.m_target.ptr();
// FIXME: Help! I am naive!
for (auto i_ = 0; i_ < source_rect.width(); ++i_) {
auto i = i_ + source_rect.x();
for (auto j_ = 0; j_ < source_rect.height(); ++j_) {
auto j = j_ + source_rect.y();
for (auto i_ = 0; i_ < target_rect.width(); ++i_) {
auto i = i_ + target_rect.x();
for (auto j_ = 0; j_ < target_rect.height(); ++j_) {
auto j = j_ + target_rect.y();
FloatVector3 value(0, 0, 0);
for (auto k = 0; k < 4; ++k) {
auto ki = i + k - 2;
if (ki < 0 || ki >= source.size().width()) {
if (i < source_rect.x() || i > source_rect.right()) {
if (parameters.should_wrap())
ki = (ki + source.size().width()) % source.size().width();
ki = (ki + source.size().width()) % source.size().width(); // TODO: fix up using source_rect
else
continue;
}
for (auto l = 0; l < 4; ++l) {
auto lj = j + l - 2;
if (lj < 0 || lj >= source.size().height()) {
if (j < source_rect.y() || j > source_rect.bottom()) {
if (parameters.should_wrap())
lj = (lj + source.size().height()) % source.size().height();
lj = (lj + source.size().height()) % source.size().height(); // TODO: fix up using source_rect
else
continue;
}
@ -128,16 +151,18 @@ public:
}
// The float->u8 overflow is intentional.
apply_cache.m_target->set_pixel(i_, j_, Color(value.x(), value.y(), value.z(), source.get_pixel(i, j).alpha()));
render_target_bitmap->set_pixel(i, j, Color(value.x(), value.y(), value.z(), source.get_pixel(i + source_delta_x, j + source_delta_y).alpha()));
}
}
// FIXME: Substitute for some sort of faster "blit" method.
for (auto i_ = 0; i_ < source_rect.width(); ++i_) {
auto i = i_ + source_rect.x();
for (auto j_ = 0; j_ < source_rect.height(); ++j_) {
auto j = j_ + source_rect.y();
source.set_pixel(i, j, apply_cache.m_target->get_pixel(i_, j_));
if (render_target_bitmap != &target) {
// FIXME: Substitute for some sort of faster "blit" method.
for (auto i_ = 0; i_ < target_rect.width(); ++i_) {
auto i = i_ + target_rect.x();
for (auto j_ = 0; j_ < target_rect.height(); ++j_) {
auto j = j_ + target_rect.y();
target.set_pixel(i, j, render_target_bitmap->get_pixel(i_, j_));
}
}
}
}