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LibGfx: Make draw_tiled_bitmap() in scaled contexts actually work

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This commit is contained in:
Nico Weber 2021-01-22 18:53:09 -05:00 • committed by Andreas Kling
parent d37efbe647
commit dcc967d1ad
2 changed files with 7 additions and 5 deletions
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2
Userland/Demos/LibGfxScaleDemo/main.cpp
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@ -102,6 +102,8 @@ void Canvas::draw(Gfx::Painter& painter)
painter.blit({ 25, 39 }, *buggie, { 2, 30, 62, 20 });
painter.draw_scaled_bitmap({ 88, 39, 62 * 2, 20 * 2 }, *buggie, Gfx::IntRect { 2, 30, 62, 20 });
painter.draw_scaled_bitmap({ 202, 39, 80, 40 }, *buggie, Gfx::IntRect { 2, 30, 62, 20 });
painter.draw_tiled_bitmap({ 25, 60, WIDTH - 50, 40 }, *buggie);
}
int main(int argc, char** argv)

10
Userland/Libraries/LibGfx/Painter.cpp
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@ -619,20 +619,20 @@ void Painter::draw_tiled_bitmap(const IntRect& a_dst_rect, const Gfx::Bitmap& so
if (source.format() == BitmapFormat::RGB32 || source.format() == BitmapFormat::RGBA32) {
int s = scale / source.scale();
if (s == 1) {
int x_start = first_column + a_dst_rect.left();
int x_start = first_column + a_dst_rect.left() * scale;
for (int row = first_row; row <= last_row; ++row) {
const RGBA32* sl = source.scanline((row + a_dst_rect.top()) % source.physical_height());
const RGBA32* sl = source.scanline((row + a_dst_rect.top() * scale) % source.physical_height());
for (int x = x_start; x < clipped_rect.width() + x_start; ++x) {
dst[x - x_start] = sl[x % source.physical_width()];
}
dst += dst_skip;
}
} else {
int x_start = first_column + a_dst_rect.left();
int x_start = first_column + a_dst_rect.left() * scale;
for (int row = first_row; row <= last_row; ++row) {
const RGBA32* sl = source.scanline(((row + a_dst_rect.top()) / s) % source.height());
const RGBA32* sl = source.scanline(((row + a_dst_rect.top() * scale) / s) % source.physical_height());
for (int x = x_start; x < clipped_rect.width() + x_start; ++x) {
dst[x - x_start] = sl[(x / s) % source.width()];
dst[x - x_start] = sl[(x / s) % source.physical_width()];
}
dst += dst_skip;
}