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LibGfx: Add Bitmap::scaled_to_size()

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Nico Weber 2023-10-18 13:29:52 -04:00 committed by Sam Atkins
parent 3907374621
commit a4dec92ed0
Notes: sideshowbarker 2024-07-17 10:31:19 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/a4dec92ed0
Pull-request: https://github.com/SerenityOS/serenity/pull/21488
Reviewed-by: https://github.com/trflynn89 ✅
2 changed files with 7 additions and 2 deletions
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8
Userland/Libraries/LibGfx/Bitmap.cpp
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@ -362,7 +362,6 @@ ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::scaled(int sx, int sy) const
return new_bitmap;
}
// http://fourier.eng.hmc.edu/e161/lectures/resize/node3.html
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::scaled(float sx, float sy) const
{
VERIFY(sx >= 0.0f && sy >= 0.0f);
@ -371,8 +370,13 @@ ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::scaled(float sx, float sy) const
int scaled_width = (int)ceilf(sx * (float)width());
int scaled_height = (int)ceilf(sy * (float)height());
return scaled_to_size({ scaled_width, scaled_height });
}
auto new_bitmap = TRY(Gfx::Bitmap::create(format(), { scaled_width, scaled_height }, scale()));
// http://fourier.eng.hmc.edu/e161/lectures/resize/node3.html
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::scaled_to_size(Gfx::IntSize size) const
{
auto new_bitmap = TRY(Gfx::Bitmap::create(format(), size, scale()));
auto old_width = physical_width();
auto old_height = physical_height();

1
Userland/Libraries/LibGfx/Bitmap.h
View file

@ -114,6 +114,7 @@ public:
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> flipped(Gfx::Orientation) const;
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> scaled(int sx, int sy) const;
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> scaled(float sx, float sy) const;
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> scaled_to_size(Gfx::IntSize) const;
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> cropped(Gfx::IntRect, Optional<BitmapFormat> new_bitmap_format = {}) const;
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> to_bitmap_backed_by_anonymous_buffer() const;
[[nodiscard]] ErrorOr<ByteBuffer> serialize_to_byte_buffer() const;