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Implement text antialias

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kichikuou
2017-04-30 11:37:27 +09:00
parent 3dd0fc60ad
commit 37b030b596
3 changed files with 89 additions and 4 deletions
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src/sys/ags_text.cpp
+75 -2
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@@ -7,6 +7,8 @@
#include "ags.h"
#include "s2utbl.h"
static bool antialias = false;
inline uint16 sjis_to_unicode(uint16 code)
{
if (code >= 0xa0 && code <= 0xdf)
@@ -22,6 +24,10 @@ void AGS::draw_text(char string[])
int screen, *dest_x, dest_y, font_size;
uint8 font_color;
uint8 antialias_cache[256*7];
if (antialias)
memset(antialias_cache, 0, 256);
if (draw_menu) {
screen = 2;
dest_x = &menu_dest_x;
@@ -54,7 +60,10 @@ void AGS::draw_text(char string[])
if((0xeb9f <= code && code <= 0xebfc) || (0xec40 <= code && code <= 0xec9e)) {
draw_gaiji(screen, *dest_x, dest_y, code, font_size, font_color);
} else {
draw_char(screen, *dest_x, dest_y, code, font_size, font_color);
if (antialias)
draw_char_antialias(screen, *dest_x, dest_y, code, font_size, font_color, antialias_cache);
else
draw_char(screen, *dest_x, dest_y, code, font_size, font_color);
}
// 画面更新
if(screen == 0) {
@@ -81,7 +90,6 @@ void AGS::draw_char(int dest, int dest_x, int dest_y, uint16 code, int size, uin
SDL_Surface* fs = TTF_RenderGlyph_Solid(font, sjis_to_unicode(code), white);
// パターン出力
// TODO: Blit?
for(int y = 0; y < size && y < fs->w && dest_y + y < 480; y++) {
uint8 *pattern = (uint8*)surface_line(fs, y); // FIXME: do not assume 8bpp
for(int x = 0; x < size && x < fs->h && dest_x + x < 640; x++) {
@@ -94,6 +102,64 @@ void AGS::draw_char(int dest, int dest_x, int dest_y, uint16 code, int size, uin
SDL_FreeSurface(fs);
}
int AGS::nearest_color(int r, int g, int b) {
int i, col, mind = INT_MAX;
for (i = 0; i < 256; i++) {
int dr = r - palR(i);
int dg = g - palG(i);
int db = b - palB(i);
int d = dr*dr*30 + dg*dg*59 + db*db*11;
if (d < mind) {
mind = d;
col = i;
}
}
return col;
}
void AGS::draw_char_antialias(int dest, int dest_x, int dest_y, uint16 code, int size, uint8 color, uint8 cache[])
{
// パターン取得
TTF_Font* font = NULL;
switch (size) {
case 16: font = hFont16; break;
case 24: font = hFont24; break;
case 32: font = hFont32; break;
case 48: font = hFont48; break;
case 64: font = hFont64; break;
}
SDL_Color black = {0, 0, 0};
SDL_Color white = {0xff, 0xff, 0xff};
SDL_Surface* fs = TTF_RenderGlyph_Shaded(font, sjis_to_unicode(code), white, black);
// パターン出力
for(int y = 0; y < size && y < fs->w && dest_y + y < 480; y++) {
uint8 *pattern = (uint8*)surface_line(fs, y);
uint32 *dp = &vram[dest][dest_y + y][dest_x];
for(int x = 0; x < size && x < fs->h && dest_x + x < 640; x++, dp++) {
uint8 bg = *dp;
int alpha = pattern[x] >> 5;
if (alpha == 0) {
// Transparent, do nothing
} else if (alpha == 7) {
*dp = color;
} else if (cache[bg] & 1 << alpha) {
*dp = cache[alpha << 8 | bg];
} else {
cache[bg] |= 1 << alpha;
int c = nearest_color((palR(color) * alpha + palR(bg) * (7 - alpha)) / 7,
(palG(color) * alpha + palG(bg) * (7 - alpha)) / 7,
(palB(color) * alpha + palB(bg) * (7 - alpha)) / 7);
cache[alpha << 8 | bg] = c;
*dp = c;
}
}
}
SDL_FreeSurface(fs);
}
void AGS::draw_gaiji(int dest, int dest_x, int dest_y, uint16 code, int size, uint8 color)
{
int index = (0xeb9f <= code && code <= 0xebfc) ? code - 0xeb9f : (0xec40 <= code && code <= 0xec9e) ? code - 0xec40 + 94 : 0;
@@ -462,3 +528,10 @@ uint16 AGS::convert_hankaku(uint16 code)
return code;
}
extern "C" {
void ags_setAntialiasedStringMode(int on) {
antialias = on != 0;
}
}