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"ASCII" - prep for adding color support

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This commit is contained in:
Bill Kendrick 2024-09-27 21:12:49 -07:00
parent 8ae1ff5050
commit c1dc09c486
1 changed files with 101 additions and 17 deletions
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118
magic/src/ascii.c
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@ -45,9 +45,12 @@ enum {
NUM_TOOLS
};
char * ascii_tool_names[NUM_TOOLS] = {
#define TOOL_COMPUTER_COLOR NUM_TOOLS
char * ascii_tool_names[NUM_TOOLS + 1] = {
gettext_noop("Typewriter"),
gettext_noop("Computer"),
gettext_noop("Color Computer"), // special version of "computer"
};
char * ascii_tool_filenames[NUM_TOOLS] = {
@ -57,6 +60,29 @@ char * ascii_tool_filenames[NUM_TOOLS] = {
static Mix_Chunk *ascii_snd[NUM_TOOLS];
float ascii_computer_colors_hsv[16][3] = {
/* Based on CGA color palette
* <https://en.wikipedia.org/wiki/Color_Graphics_Adapter#Color_palette> */
{ -1, 0.00, 0.00 }, // #000000 - Black
{ -1, 0.00, 0.33 }, // #555555 - Dark gray
{ 240, 1.00, 0.67 }, // #0000AA - Blue
{ 240, 0.67, 1.00 }, // #5555FF - Light blue
{ 120, 1.00, 0.67 }, // #00AA00 - Green
{ 120, 0.67, 1.00 }, // #55FF55 - Light green
{ 180, 1.00, 0.67 }, // #00AAAA - Cyan
{ 180, 0.67, 1.00 }, // #55FFFF - Light cyan
{ 0, 1.00, 0.67 }, // #AA0000 - Red
{ 0, 0.67, 1.00 }, // #FF5555 - Light red
{ 300, 1.00, 0.67 }, // #AA00AA - Magenta
{ 300, 0.67, 1.00 }, // #FF55FF - Light magenta
{ 30, 1.00, 0.67 }, // #AA5500 - Brown
{ 60, 0.67, 1.00 }, // #FFFF55 - Yellow
{ - 1, 0.00, 0.67 }, // #AAAAAA - Light gray
{ -1, 0.00, 1.00 }, // #FFFFFF - White
};
float ascii_computer_colors_hsv[16][3];
/* For each variation, we'll have a bitmap with an arbitrary number
* of potentially-proportionally-spaced characters (which we'll treat
* as fixed-width), so we need to keep track of each character's X
@ -70,6 +96,7 @@ int ascii_char_maxwidth[NUM_TOOLS];
int ascii_char_brightness[NUM_TOOLS][MAX_CHARS];
SDL_Surface * ascii_snapshot = NULL;
int ascii_size;
Uint8 ascii_r,ascii_g, ascii_b;
Uint32 ascii_api_version(void);
@ -274,7 +301,7 @@ int ascii_init(magic_api * api, Uint8 disabled_features ATTRIBUTE_UNUSED, Uint8
int ascii_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
return (NUM_TOOLS);
return (NUM_TOOLS + 1);
}
SDL_Surface *ascii_get_icon(magic_api * api, int which)
@ -380,13 +407,18 @@ void ascii_shutdown(magic_api * api ATTRIBUTE_UNUSED)
}
void ascii_set_color(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED,
SDL_Surface * last ATTRIBUTE_UNUSED, Uint8 r ATTRIBUTE_UNUSED, Uint8 g ATTRIBUTE_UNUSED,
Uint8 b ATTRIBUTE_UNUSED, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
SDL_Surface * last ATTRIBUTE_UNUSED, Uint8 r, Uint8 g, Uint8 b, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
{
ascii_r = r;
ascii_g = g;
ascii_b = b;
}
int ascii_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
if (which == TOOL_TYPEWRITER || which == TOOL_COMPUTER)
return 1;
return 0;
}
@ -429,7 +461,7 @@ Uint8 ascii_default_size(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_U
if (mode == MODE_PAINT)
return 3;
return 0;
return 1;
}
void ascii_set_size(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
@ -442,11 +474,18 @@ 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 ATTRIBUTE_UNUSED, int x, int y)
{
magic_api *api = (magic_api *) ptr;
int w, h, n, sx, sy, xx, yy, brightness;
int w, h, n, sx, sy, xx, yy, ww, brightness, rr, gg, bb;
Uint8 r, g, b;
Uint32 clear_pixel;
Uint8 clear_brightness;
SDL_Rect src, dest;
int computer_color = 0;
if (which == TOOL_COMPUTER_COLOR)
{
which = TOOL_COMPUTER;
computer_color = 1;
}
w = ascii_char_maxwidth[which];
h = ascii_bitmap[which]->h;
@ -464,6 +503,29 @@ void do_ascii_effect(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * l
SDL_GetRGB(clear_pixel, ascii_bitmap[which]->format, &r, &g, &b);
clear_brightness = ((r + g + b) / 3.0);
brightness = 0;
rr = 0;
gg = 0;
bb = 0;
for (yy = sy; yy < sy + h; yy++)
{
for (xx = sx; xx < sx + w; xx++)
{
SDL_GetRGB(api->getpixel(ascii_snapshot, xx, yy), ascii_snapshot->format, &r, &g, &b);
brightness += get_bright(api, r, g, b);
if (computer_color)
{
rr += r;
gg += g;
bb += b;
}
}
}
brightness = brightness / (w * h);
/* Background (and also, all we draw, if "Space") */
dest.x = sx;
dest.y = sy;
dest.w = w;
@ -471,23 +533,45 @@ void do_ascii_effect(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * l
SDL_FillRect(canvas, &dest, clear_pixel);
brightness = 0;
for (yy = sy; yy < sy + h; yy++)
{
for (xx = sx; xx < sx + w; xx++)
{
SDL_GetRGB(api->getpixel(ascii_snapshot, xx, yy), ascii_snapshot->format, &r, &g, &b);
brightness += get_bright(api, r, g, b);
}
}
brightness = brightness / (w * h);
if (brightness != clear_brightness)
{
/* A visible character */
if (computer_color)
{
/* Find the best color, based on the avg. of the
pixels we're replacing */
rr /= (w * h);
gg /= (w * h);
bb /= (w * h);
/* FIXME: Map to computer color */
}
else
{
/* Use the user-chosen color */
rr = ascii_r;
gg = ascii_b;
bb = ascii_g;
}
/* Blit the glyph */
n = get_best_char(which, brightness);
ww = ascii_char_x[which][n + 1] - ascii_char_x[which][n];
dest.x = sx + (w - ww) / 2;
dest.y = sy;
dest.w = ww;
dest.h = h;
SDL_FillRect(canvas, &dest, SDL_MapRGB(canvas->format, rr, gg, bb));
src.x = ascii_char_x[which][n];
src.y = 0;
src.w = ascii_char_x[which][n + 1] - ascii_char_x[which][n];
src.w = ww;
src.h = h;
dest.x = sx + (w - src.w) / 2;