github.com/Interlisp.maiko
1
0
Fork 0
mirror of https://github.com/Interlisp/maiko.git synced 2026-01-20 17:47:48 +00:00
Code Issues Projects Releases Wiki Activity

When updating the window surface directly, at scale 1, avoid the intermediate buffer

Browse Source 
Adds an sdl_blt_to_window_surface() that goes directly from the Lisp bitmap
to the window surface avoiding the intermediate copy.  This is only coded for a
scale factor of 1.  Uses the intermediate buffer if the scale is not 1.

Corrects an error where the damage rectangle was not properly reset.
This commit is contained in:
Nick Briggs 2021-11-09 20:15:00 -08:00
parent 4104219ee5
commit 16e4062b8f
1 changed files with 40 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
src/sdl.c
View File

@ -385,6 +385,39 @@ void sdl_bitblt_to_screen(int _x, int _y, int _w, int _h) {
int after = SDL_GetTicks();
// printf("bitblting took %dms\n", after - before);
}
void sdl_bitblt_to_window_surface(int _x, int _y, int _w, int _h) {
// printf("bitblt(%d, %d, %d, %d)\n", _x, _y, _w, _h);
Uint32 *dr = (Uint32*)DisplayRegion68k;
int before = SDL_GetTicks();
int width = sdl_displaywidth;
int height = sdl_displayheight;
int bpw = 8 * sizeof(Uint32);
int pitch = sdl_displaywidth / bpw;
int xlimit = (_x + _w + bpw - 1) / bpw;
int ylimit = _y + _h;
for(int y = _y; y < ylimit; y++) {
for(int x = _x / bpw; x < xlimit; x++) {
int w = dr[y * pitch + x];
int thex = x * bpw;
for(int b = 0; b < bpw; b++) {
//printf("%d/%d %d\n", x, y, b);
uint32_t px = 0;
if(w & (1 << (bpw - 1 - b))) {
px = do_invert ? sdl_white : sdl_black;
} else {
px = do_invert ? sdl_black : sdl_white;
}
//printf("px is %x\n", px);
int pxindex = (y * sdl_displaywidth) + thex + b;
assert(pxindex >= 0 && pxindex < buffer_size);
((Uint32 *)sdl_windowsurface->pixels)[pxindex] = px;
}
}
}
int after = SDL_GetTicks();
// printf("bitblting took %dms\n", after - before);
}
#endif
static int map_key(SDL_Keycode k) {
for(int i = 0; keymap[i] != -1; i+= 2) {
@ -528,16 +561,13 @@ void sdl_update_display_surfaces() {
if (!should_update_texture || this_draw - last_draw <= 16) {
return;
}
before = SDL_GetTicks();
sdl_bitblt_to_screen(min_x, min_y, max_x - min_x, max_y - min_y);
after = SDL_GetTicks();
SDL_Rect r;
r.x = min_x;
r.y = min_y;
r.w = max_x - min_x;
r.h = max_y - min_y;
if (sdl_pixelscale == 1) {
SDL_BlitSurface(sdl_buffersurface, &r, sdl_windowsurface, &r);
sdl_bitblt_to_window_surface(r.x, r.y, r.w, r.h);
SDL_UpdateWindowSurfaceRects(sdl_window, &r, 1);
} else {
SDL_Rect s;
@ -545,13 +575,15 @@ void sdl_update_display_surfaces() {
s.y = r.y * sdl_pixelscale;
s.w = r.w * sdl_pixelscale;
s.h = r.h * sdl_pixelscale;
sdl_bitblt_to_screen(r.x, r.y, r.w, r.h);
SDL_BlitScaled(sdl_buffersurface, &r, sdl_windowsurface, &s);
SDL_UpdateWindowSurfaceRects(sdl_window, &s, 1);
}
min_x = 0;
max_x = sdl_displaywidth;
min_y = 0;
max_y = sdl_displayheight;
min_x = sdl_displaywidth;
max_x = 0;
min_y = sdl_displayheight;
max_y = 0;
should_update_texture = 0;
after = SDL_GetTicks();
last_draw = this_draw;
// printf("surface update took %dms\n", after - before);