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@@ -1180,6 +1180,59 @@ ALWAYS_INLINE static void do_draw_integer_scaled_bitmap(Gfx::Bitmap& target, Int
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}
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}
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+template<bool has_alpha_channel, typename GetPixel>
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+ALWAYS_INLINE static void do_draw_box_sampled_scaled_bitmap(Gfx::Bitmap& target, IntRect const& dst_rect, IntRect const& clipped_rect, Gfx::Bitmap const& source, FloatRect const& src_rect, GetPixel get_pixel, float opacity)
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+{
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+ float source_pixel_width = src_rect.width() / dst_rect.width();
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+ float source_pixel_height = src_rect.height() / dst_rect.height();
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+ float source_pixel_area = source_pixel_width * source_pixel_height;
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+
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+ for (int y = clipped_rect.top(); y <= clipped_rect.bottom(); ++y) {
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+ auto* scanline = reinterpret_cast<Color*>(target.scanline(y));
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+ for (int x = clipped_rect.left(); x <= clipped_rect.right(); ++x) {
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+ // Project the destination pixel in the source image
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+ FloatRect source_box = {
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+ src_rect.left() + (x - dst_rect.x()) * source_pixel_width,
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+ src_rect.top() + (y - dst_rect.y()) * source_pixel_height,
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+ source_pixel_width,
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+ source_pixel_height,
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+ };
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+ IntRect enclosing_source_box = enclosing_int_rect(source_box).intersected(source.rect());
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+
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+ // Sum the contribution of all source pixels inside the projected pixel
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+ float red_accumulator = 0.f;
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+ float green_accumulator = 0.f;
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+ float blue_accumulator = 0.f;
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+ float total_area = 0.f;
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+ for (int sy = enclosing_source_box.y(); sy <= enclosing_source_box.bottom(); ++sy) {
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+ for (int sx = enclosing_source_box.x(); sx <= enclosing_source_box.right(); ++sx) {
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+ float area = source_box.intersected({ static_cast<float>(sx), static_cast<float>(sy), 1.f, 1.f }).size().area();
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+
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+ auto pixel = get_pixel(source, sx, sy);
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+ area *= pixel.alpha() / 255.f;
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+
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+ red_accumulator += pixel.red() * area;
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+ green_accumulator += pixel.green() * area;
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+ blue_accumulator += pixel.blue() * area;
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+ total_area += area;
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+ }
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+ }
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+
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+ Color src_pixel = {
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+ round_to<u8>(min(red_accumulator / total_area, 255.f)),
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+ round_to<u8>(min(green_accumulator / total_area, 255.f)),
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+ round_to<u8>(min(blue_accumulator / total_area, 255.f)),
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+ round_to<u8>(min(total_area * 255.f / source_pixel_area * opacity, 255.f)),
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+ };
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+
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+ if constexpr (has_alpha_channel)
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+ scanline[x] = scanline[x].blend(src_pixel);
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+ else
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+ scanline[x] = src_pixel;
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+ }
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+ }
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+}
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+
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template<bool has_alpha_channel, Painter::ScalingMode scaling_mode, typename GetPixel>
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ALWAYS_INLINE static void do_draw_scaled_bitmap(Gfx::Bitmap& target, IntRect const& dst_rect, IntRect const& clipped_rect, Gfx::Bitmap const& source, FloatRect const& src_rect, GetPixel get_pixel, float opacity)
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{
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@@ -1208,6 +1261,9 @@ ALWAYS_INLINE static void do_draw_scaled_bitmap(Gfx::Bitmap& target, IntRect con
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}
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}
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+ if constexpr (scaling_mode == Painter::ScalingMode::BoxSampling)
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+ return do_draw_box_sampled_scaled_bitmap<has_alpha_channel>(target, dst_rect, clipped_rect, source, src_rect, get_pixel, opacity);
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+
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bool has_opacity = opacity != 1.f;
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i64 shift = (i64)1 << 32;
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i64 fractional_mask = shift - (u64)1;
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@@ -1307,6 +1363,9 @@ ALWAYS_INLINE static void do_draw_scaled_bitmap(Gfx::Bitmap& target, IntRect con
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case Painter::ScalingMode::BilinearBlend:
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do_draw_scaled_bitmap<has_alpha_channel, Painter::ScalingMode::BilinearBlend>(target, dst_rect, clipped_rect, source, src_rect, get_pixel, opacity);
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break;
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+ case Painter::ScalingMode::BoxSampling:
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+ do_draw_scaled_bitmap<has_alpha_channel, Painter::ScalingMode::BoxSampling>(target, dst_rect, clipped_rect, source, src_rect, get_pixel, opacity);
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+ break;
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case Painter::ScalingMode::None:
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do_draw_scaled_bitmap<has_alpha_channel, Painter::ScalingMode::None>(target, dst_rect, clipped_rect, source, src_rect, get_pixel, opacity);
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break;
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