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"ASCII": Use a snapshot, not current canvas (last)

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This commit is contained in:
Bill Kendrick 2024-09-27 20:08:43 -07:00
parent 2484cbe3d8
commit bd0cb61dc0
1 changed files with 18 additions and 2 deletions
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20
magic/src/ascii.c
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@ -68,6 +68,7 @@ int ascii_char_x[NUM_TOOLS][MAX_CHARS];
int ascii_num_chars[NUM_TOOLS];
int ascii_char_maxwidth[NUM_TOOLS];
int ascii_char_brightness[NUM_TOOLS][MAX_CHARS];
SDL_Surface * ascii_snapshot = NULL;
Uint32 ascii_api_version(void);
int ascii_init(magic_api * api, Uint8 disabled_features, Uint8 complexity_level);
@ -368,6 +369,12 @@ void ascii_shutdown(magic_api * api ATTRIBUTE_UNUSED)
if (ascii_bitmap[i] != NULL)
SDL_FreeSurface(ascii_bitmap[i]);
}
if (ascii_snapshot != NULL)
{
SDL_FreeSurface(ascii_snapshot);
ascii_snapshot = NULL;
}
}
void ascii_set_color(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED,
@ -384,6 +391,15 @@ int ascii_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_
void ascii_switchin(magic_api * api ATTRIBUTE_UNUSED,
int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
if (ascii_snapshot == NULL)
ascii_snapshot = SDL_CreateRGBSurface(SDL_SWSURFACE, canvas->w, canvas->h,
canvas->format->BitsPerPixel, canvas->format->Rmask,
canvas->format->Gmask, canvas->format->Bmask, canvas->format->Amask);
if (ascii_snapshot != NULL)
{
SDL_BlitSurface(canvas, NULL, ascii_snapshot, NULL);
}
}
void ascii_switchout(magic_api * api ATTRIBUTE_UNUSED,
@ -413,7 +429,7 @@ void ascii_set_size(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED
{
}
void do_ascii_effect(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y)
void do_ascii_effect(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last ATTRIBUTE_UNUSED, int x, int y)
{
magic_api *api = (magic_api *) ptr;
int w, h, n, xx, yy, brightness;
@ -446,7 +462,7 @@ void do_ascii_effect(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * l
{
for (xx = x; xx < x + w; xx++)
{
SDL_GetRGB(api->getpixel(last, xx, yy), last->format, &r, &g, &b);
SDL_GetRGB(api->getpixel(ascii_snapshot, xx, yy), ascii_snapshot->format, &r, &g, &b);
brightness += get_bright(api, r, g, b);
}
}