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GraphicsBitmap: Provide templated versions of get_pixel() and set_pixel().

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If we already know the bitmap format used, we can use these functions to
bypass the format checks and go straight to pixel manipulation.
This commit is contained in:
Andreas Kling 2019-06-15 11:06:02 +02:00
parent 150b3cf378
commit dcbddb4f8c
2 changed files with 73 additions and 25 deletions
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92
SharedGraphics/GraphicsBitmap.h
View file

@ -51,41 +51,27 @@ public:
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(); }
template<Format>
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();
}
ASSERT_NOT_REACHED();
}
Color get_pixel(int x, int y) const;
Color get_pixel(const Point& position) const
{
return get_pixel(position.x(), position.y());
}
void set_pixel(int x, int y, Color color)
template<Format>
void set_pixel(int x, int y, Color)
{
switch (m_format) {
case Format::RGB32:
scanline(y)[x] = color.value();
break;
case Format::RGBA32:
scanline(y)[x] = color.value();
break;
case Format::Indexed8:
ASSERT_NOT_REACHED();
default:
ASSERT_NOT_REACHED();
}
ASSERT_NOT_REACHED();
}
void set_pixel(int x, int y, Color);
void set_pixel(const Point& position, Color color)
{
set_pixel(position.x(), position.y(), color);
@ -126,3 +112,63 @@ inline byte* GraphicsBitmap::bits(int y)
{
return reinterpret_cast<byte*>(scanline(y));
}
template<>
inline Color GraphicsBitmap::get_pixel<GraphicsBitmap::Format::RGB32>(int x, int y) const
{
return Color::from_rgb(scanline(y)[x]);
}
template<>
inline Color GraphicsBitmap::get_pixel<GraphicsBitmap::Format::RGBA32>(int x, int y) const
{
return Color::from_rgba(scanline(y)[x]);
}
template<>
inline Color GraphicsBitmap::get_pixel<GraphicsBitmap::Format::Indexed8>(int x, int y) const
{
return Color::from_rgba(m_palette[bits(y)[x]]);
}
inline Color GraphicsBitmap::get_pixel(int x, int y) const
{
switch (m_format) {
case Format::RGB32:
return get_pixel<Format::RGB32>(x, y);
case Format::RGBA32:
return get_pixel<Format::RGBA32>(x, y);
case Format::Indexed8:
return get_pixel<Format::Indexed8>(x, y);
default:
ASSERT_NOT_REACHED();
}
}
template<>
inline void GraphicsBitmap::set_pixel<GraphicsBitmap::Format::RGB32>(int x, int y, Color color)
{
scanline(y)[x] = color.value();
}
template<>
inline void GraphicsBitmap::set_pixel<GraphicsBitmap::Format::RGBA32>(int x, int y, Color color)
{
scanline(y)[x] = color.value();
}
inline void GraphicsBitmap::set_pixel(int x, int y, Color color)
{
switch (m_format) {
case Format::RGB32:
set_pixel<Format::RGB32>(x, y, color);
break;
case Format::RGBA32:
set_pixel<Format::RGBA32>(x, y, color);
break;
case Format::Indexed8:
ASSERT_NOT_REACHED();
default:
ASSERT_NOT_REACHED();
}
}