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LibGfx: Implement scaling support for draw_tiled_bitmap()

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Closes #5017.
This commit is contained in:
Nico Weber 2021-01-22 13:33:57 -05:00 committed by Andreas Kling
parent bfce0fccde
commit d1ea418e43
Notes: sideshowbarker 2024-07-18 23:00:09 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/d1ea418e43b
Pull-request: https://github.com/SerenityOS/serenity/pull/5050
Issue: https://github.com/SerenityOS/serenity/issues/5017
1 changed files with 25 additions and 9 deletions
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34
Userland/Libraries/LibGfx/Painter.cpp
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@ -598,12 +598,17 @@ void Painter::blit_dimmed(const IntPoint& position, const Gfx::Bitmap& source, c
void Painter::draw_tiled_bitmap(const IntRect& a_dst_rect, const Gfx::Bitmap& source)
{
ASSERT(scale() == 1); // FIXME: Add scaling support.
ASSERT((source.scale() == 1 || source.scale() == scale()) && "draw_tiled_bitmap only supports integer upsampling");
auto dst_rect = a_dst_rect.translated(translation());
auto clipped_rect = dst_rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
int scale = this->scale();
clipped_rect *= scale;
dst_rect *= scale;
const int first_row = (clipped_rect.top() - dst_rect.top());
const int last_row = (clipped_rect.bottom() - dst_rect.top());
const int first_column = (clipped_rect.left() - dst_rect.left());
@ -611,14 +616,25 @@ void Painter::draw_tiled_bitmap(const IntRect& a_dst_rect, const Gfx::Bitmap& so
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
if (source.format() == BitmapFormat::RGB32 || source.format() == BitmapFormat::RGBA32) {
int x_start = first_column + a_dst_rect.left();
for (int row = first_row; row <= last_row; ++row) {
const RGBA32* sl = source.scanline((row + a_dst_rect.top())
% source.size().height());
for (int x = x_start; x < clipped_rect.width() + x_start; ++x) {
dst[x - x_start] = sl[x % source.size().width()];
int s = scale / source.scale();
if (s == 1) {
int x_start = first_column + a_dst_rect.left();
for (int row = first_row; row <= last_row; ++row) {
const RGBA32* sl = source.scanline((row + a_dst_rect.top()) % 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();
for (int row = first_row; row <= last_row; ++row) {
const RGBA32* sl = source.scanline(((row + a_dst_rect.top()) / s) % source.height());
for (int x = x_start; x < clipped_rect.width() + x_start; ++x) {
dst[x - x_start] = sl[(x / s) % source.width()];
}
dst += dst_skip;
}
dst += dst_skip;
}
return;
}
@ -686,7 +702,7 @@ void Painter::blit_with_alpha(const IntPoint& position, const Gfx::Bitmap& sourc
void Painter::blit(const IntPoint& position, const Gfx::Bitmap& source, const IntRect& a_src_rect, float opacity)
{
assert(scale() >= source.scale() && "painter doesn't support downsampling scale factors");
ASSERT(scale() >= source.scale() && "painter doesn't support downsampling scale factors");
if (opacity < 1.0f)
return blit_with_opacity(position, source, a_src_rect, opacity);