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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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27
SharedGraphics/GraphicsBitmap.h
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@ -11,7 +11,7 @@
class GraphicsBitmap : public Retainable<GraphicsBitmap> {
public:
enum class Format { Invalid, RGB32, RGBA32 };
enum class Format { Invalid, RGB32, RGBA32, Indexed8 };
static Retained<GraphicsBitmap> create(Format, const Size&);
static Retained<GraphicsBitmap> create_wrapper(Format, const Size&, RGBA32*);
@ -23,6 +23,8 @@ public:
RGBA32* scanline(int y);
const RGBA32* scanline(int y) const;
const byte* bits(int y) const;
Rect rect() const { return { {}, m_size }; }
Size size() const { return m_size; }
int width() const { return m_size.width(); }
@ -37,6 +39,23 @@ public:
size_t size_in_bytes() const { return m_pitch * m_size.height() * sizeof(RGBA32); }
Color palette_color(byte index) const { return Color::from_rgba(m_palette[index]); }
void set_palette_color(byte index, Color color) { m_palette[index] = color.value(); }
Color get_pixel(int x, int y) const
{
switch (m_format) {
case Format::RGB32:
return Color::from_rgb(scanline(y)[x]);
case Format::RGBA32:
return Color::from_rgba(scanline(y)[x]);
case Format::Indexed8:
return Color::from_rgba(m_palette[bits(y)[x]]);
default:
ASSERT_NOT_REACHED();
}
}
private:
GraphicsBitmap(Format, const Size&);
GraphicsBitmap(Format, const Size&, RGBA32*);
@ -45,6 +64,7 @@ private:
Size m_size;
RGBA32* m_data { nullptr };
RGBA32* m_palette { nullptr };
size_t m_pitch { 0 };
Format m_format { Format::Invalid };
bool m_needs_munmap { false };
@ -61,3 +81,8 @@ inline const RGBA32* GraphicsBitmap::scanline(int y) const
{
return reinterpret_cast<const RGBA32*>((((const byte*)m_data) + (y * m_pitch)));
}
inline const byte* GraphicsBitmap::bits(int y) const
{
return reinterpret_cast<const byte*>(scanline(y));
}