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LibGfx: Add Bitmap::strip_alpha_channel()

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Sets all alpha values to 0xff and sets the bitmap's format to BGRx8888.

Currently only implemented for BGRA8888 and BGRx8888.
This commit is contained in:
Nico Weber 2023-06-13 19:23:38 -04:00 • committed by Andreas Kling
parent 6e0fc5e221
commit d70ddc8961
2 changed files with 11 additions and 0 deletions
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8
Userland/Libraries/LibGfx/Bitmap.cpp
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@ -546,6 +546,14 @@ Bitmap::~Bitmap()
delete[] m_palette; delete[] m_palette;
} }
void Bitmap::strip_alpha_channel()
{
VERIFY(m_format == BitmapFormat::BGRA8888 || m_format == BitmapFormat::BGRx8888);
for (ARGB32& pixel : *this)
pixel = 0xff000000 | (pixel & 0xffffff);
m_format = BitmapFormat::BGRx8888;
}
void Bitmap::set_mmap_name([[maybe_unused]] DeprecatedString const& name) void Bitmap::set_mmap_name([[maybe_unused]] DeprecatedString const& name)
{ {
VERIFY(m_needs_munmap); VERIFY(m_needs_munmap);

3
Userland/Libraries/LibGfx/Bitmap.h
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@ -212,6 +212,9 @@ public:
[[nodiscard]] bool has_alpha_channel() const { return m_format == BitmapFormat::BGRA8888 || m_format == BitmapFormat::RGBA8888; } [[nodiscard]] bool has_alpha_channel() const { return m_format == BitmapFormat::BGRA8888 || m_format == BitmapFormat::RGBA8888; }
[[nodiscard]] BitmapFormat format() const { return m_format; } [[nodiscard]] BitmapFormat format() const { return m_format; }
// Call only for BGRx8888 and BGRA8888 bitmaps.
void strip_alpha_channel();
void set_mmap_name(DeprecatedString const&); void set_mmap_name(DeprecatedString const&);
[[nodiscard]] static constexpr size_t size_in_bytes(size_t pitch, int physical_height) { return pitch * physical_height; } [[nodiscard]] static constexpr size_t size_in_bytes(size_t pitch, int physical_height) { return pitch * physical_height; }