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fb_sdl: align texture at 8x8 boundary

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This facilitates the use of SIMD-optimized back2front blitting. Thanks
to the capture viewport, the optimization can be used for arbitrary
window sizes.

Issue #5518
This commit is contained in:
Norman Feske 2025-04-14 21:07:44 +02:00
parent d0e97c1e59
commit 5961c16113
1 changed files with 15 additions and 5 deletions
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20
repos/os/src/driver/framebuffer/sdl/main.cc
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@ -158,10 +158,17 @@ struct Fb_sdl::Sdl : Noncopyable
}
};
static unsigned aligned_at_8px(unsigned w) { return (w + 7U) & ~7U; }
static Area aligned_at_8x8(Area a) { return { aligned_at_8px(a.w),
aligned_at_8px(a.h) }; }
struct Screen
{
Area const size;
Area const aligned_size = aligned_at_8x8(size);
SDL_Renderer &renderer;
SDL_Surface &_surface = _init_surface();
@ -177,7 +184,7 @@ struct Fb_sdl::Sdl : Noncopyable
unsigned const alpha_mask = 0xFF000000;
SDL_Surface * const surface_ptr =
SDL_CreateRGBSurface(flags, size.w, size.h, bpp,
SDL_CreateRGBSurface(flags, aligned_size.w, aligned_size.h, bpp,
red_mask, green_mask, blue_mask, alpha_mask);
if (!surface_ptr) {
error("SDL_CreateRGBSurface failed (", Cstring(SDL_GetError()), ")");
@ -192,7 +199,7 @@ struct Fb_sdl::Sdl : Noncopyable
SDL_Texture * const texture_ptr =
SDL_CreateTexture(&renderer, SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_STREAMING,
size.w, size.h);
aligned_size.w, aligned_size.h);
if (!texture_ptr) {
error("SDL_CreateTexture failed (", Cstring(SDL_GetError()), ")");
throw Createtexture_failed();
@ -211,7 +218,7 @@ struct Fb_sdl::Sdl : Noncopyable
void with_surface(auto const &fn)
{
Surface<Pixel> surface { (Pixel *)_surface.pixels, size };
Surface<Pixel> surface { (Pixel *)_surface.pixels, aligned_at_8x8(size) };
fn(surface);
}
@ -280,11 +287,14 @@ struct Fb_sdl::Sdl : Noncopyable
{
_screen.construct(size, _window->renderer);
Area const padded_px = aligned_at_8x8(size);
using Attr = Capture::Connection::Screen::Attr;
_captured_screen.construct(_capture, _rm, Attr {
.px = Blit::transformed(size, _attr.rotate),
.px = Blit::transformed(padded_px, _attr.rotate),
.mm = { },
.viewport = { { }, Blit::transformed(size, _attr.rotate) },
.viewport = Blit::transformed(Rect { { }, size }, padded_px,
_attr.rotate, _attr.flip),
.rotate = _attr.rotate,
.flip = _attr.flip });