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Painter: Simplify the draw_scaled_bitmap() fast path for integer scale.
Iterate over the source image instead of the destination image, and blow it up pixel by pixel. This code will only run for upscaling so we don't need to worry about anything else.
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1652cb7db9
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1 changed files with 13 additions and 14 deletions
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@ -349,21 +349,20 @@ void Painter::blit(const Point& position, const GraphicsBitmap& source, const Re
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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_integer_scaled_bitmap(GraphicsBitmap& target, const Rect& dst_rect, const Rect& clipped_rect, const GraphicsBitmap& source, int hscale, int vscale, int hfactor, int vfactor, GetPixel get_pixel)
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ALWAYS_INLINE static void do_draw_integer_scaled_bitmap(GraphicsBitmap& target, const Rect& dst_rect, const GraphicsBitmap& source, int hfactor, int vfactor, GetPixel get_pixel)
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{
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for (int y = clipped_rect.top(); y <= clipped_rect.bottom(); y += vfactor) {
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for (int x = clipped_rect.left(); x <= clipped_rect.right(); x += hfactor) {
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auto scaled_x = ((x - dst_rect.x()) * hscale) >> 16;
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auto scaled_y = ((y - dst_rect.y()) * vscale) >> 16;
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auto src_pixel = get_pixel(source, scaled_x, scaled_y);
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for (int y = source.rect().top(); y <= source.rect().bottom(); ++y) {
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int dst_y = dst_rect.y() + y * vfactor;
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for (int x = source.rect().left(); x <= source.rect().right(); ++x) {
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auto src_pixel = get_pixel(source, x, y);
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for (int yo = 0; yo < vfactor; ++yo) {
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auto* scanline = (Color*)target.scanline(y + yo);
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auto* scanline = (Color*)target.scanline(dst_y + yo);
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int dst_x = dst_rect.x() + x * hfactor;
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for (int xo = 0; xo < hfactor; ++xo) {
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if constexpr (has_alpha_channel)
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scanline[x + xo] = scanline[x].blend(src_pixel);
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scanline[dst_x + xo] = scanline[dst_x + xo].blend(src_pixel);
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else
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scanline[x + xo] = src_pixel;
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scanline[dst_x + xo] = src_pixel;
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}
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}
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}
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@ -377,12 +376,12 @@ ALWAYS_INLINE static void do_draw_scaled_bitmap(GraphicsBitmap& target, const Re
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int hfactor = dst_rect.width() / src_rect.width();
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int vfactor = dst_rect.height() / src_rect.height();
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if (hfactor == 2 && vfactor == 2)
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, clipped_rect, source, hscale, vscale, 2, 2, get_pixel);
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, source, 2, 2, get_pixel);
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if (hfactor == 3 && vfactor == 3)
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, clipped_rect, source, hscale, vscale, 3, 3, get_pixel);
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, source, 3, 3, get_pixel);
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if (hfactor == 4 && vfactor == 4)
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, clipped_rect, source, hscale, vscale, 4, 4, get_pixel);
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, clipped_rect, source, hscale, vscale, hfactor, vfactor, get_pixel);
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, source, 4, 4, get_pixel);
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return do_draw_integer_scaled_bitmap<has_alpha_channel>(target, dst_rect, source, hfactor, vfactor, get_pixel);
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}
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for (int y = clipped_rect.top(); y <= clipped_rect.bottom(); ++y) {
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