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GraphicsBitmap: Add a new "Indexed8" format that uses a 256-entry palette.

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These bitmaps should only be used as a source bitmap, we won't support
painting into them using Painter. You can however manipulate the raw
pixel data. :^)
This commit is contained in:
Andreas Kling 2019-05-06 19:32:56 +02:00
parent cec16105cc
commit 61e3ecec79
3 changed files with 56 additions and 8 deletions
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6
SharedGraphics/GraphicsBitmap.cpp
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@ -17,6 +17,8 @@ GraphicsBitmap::GraphicsBitmap(Format format, const Size& size)
, m_pitch(round_up_to_power_of_two(size.width() * sizeof(RGBA32), 16))
, m_format(format)
{
if (format == Format::Indexed8)
m_palette = new RGBA32[256];
m_data = (RGBA32*)mmap(nullptr, size_in_bytes(), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
ASSERT(m_data && m_data != (void*)-1);
m_needs_munmap = true;
@ -47,6 +49,7 @@ GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, RGBA32* data)
, m_pitch(round_up_to_power_of_two(size.width() * sizeof(RGBA32), 16))
, m_format(format)
{
ASSERT(format != Format::Indexed8);
}
GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, MappedFile&& mapped_file)
@ -56,6 +59,7 @@ GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, MappedFile&& map
, m_format(format)
, m_mapped_file(move(mapped_file))
{
ASSERT(format != Format::Indexed8);
}
Retained<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(Format format, Retained<SharedBuffer>&& shared_buffer, const Size& size)
@ -70,6 +74,7 @@ GraphicsBitmap::GraphicsBitmap(Format format, Retained<SharedBuffer>&& shared_bu
, m_format(format)
, m_shared_buffer(move(shared_buffer))
{
ASSERT(format != Format::Indexed8);
}
GraphicsBitmap::~GraphicsBitmap()
@ -79,6 +84,7 @@ GraphicsBitmap::~GraphicsBitmap()
ASSERT(rc == 0);
}
m_data = nullptr;
delete [] m_palette;
}
void GraphicsBitmap::set_mmap_name(const String& name)