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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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31
SharedGraphics/Painter.cpp
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@ -308,15 +308,32 @@ void Painter::blit(const Point& position, const GraphicsBitmap& source, const Re
const int last_row = clipped_rect.bottom() - dst_rect.top();
const int first_column = clipped_rect.left() - dst_rect.left();
RGBA32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x();
const RGBA32* src = source.scanline(src_rect.top() + first_row) + src_rect.left() + first_column;
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
const size_t src_skip = source.pitch() / sizeof(RGBA32);
for (int row = first_row; row <= last_row; ++row) {
fast_dword_copy(dst, src, clipped_rect.width());
dst += dst_skip;
src += src_skip;
if (source.format() == GraphicsBitmap::Format::RGB32 || source.format() == GraphicsBitmap::Format::RGBA32) {
const RGBA32* src = source.scanline(src_rect.top() + first_row) + src_rect.left() + first_column;
const size_t src_skip = source.pitch() / sizeof(RGBA32);
for (int row = first_row; row <= last_row; ++row) {
fast_dword_copy(dst, src, clipped_rect.width());
dst += dst_skip;
src += src_skip;
}
return;
}
if (source.format() == GraphicsBitmap::Format::Indexed8) {
const byte* src = source.bits(src_rect.top() + first_row) + src_rect.left() + first_column;
const size_t src_skip = source.pitch();
for (int row = first_row; row <= last_row; ++row) {
for (int i = 0; i < clipped_rect.width(); ++i)
dst[i] = source.palette_color(src[i]).value();
dst += dst_skip;
src += src_skip;
}
return;
}
ASSERT_NOT_REACHED();
}
void Painter::draw_scaled_bitmap(const Rect& a_dst_rect, const GraphicsBitmap& source, const Rect& src_rect)
@ -345,7 +362,7 @@ void Painter::draw_scaled_bitmap(const Rect& a_dst_rect, const GraphicsBitmap& s
auto scaled_x = (float)(x - dst_rect.x()) * hscale;
auto scaled_y = (float)(y - dst_rect.y()) * vscale;
auto src_pixel = Color::from_rgba(source.scanline((int)scaled_y)[(int)scaled_x]);
auto src_pixel = source.get_pixel(scaled_x, scaled_y);
if (!src_pixel.alpha())
continue;