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Use indexed array for text glyphs, instead of hashmap.

This commit is contained in:
Steve 2021-05-01 13:35:33 +01:00
parent 69c2fdf680
commit 732a86aefd
3 changed files with 106 additions and 142 deletions
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8
src/structs.h
View File

@ -545,16 +545,10 @@ struct Credit {
Credit *next;
};
struct Glyph {
char character[MAX_NAME_LENGTH];
SDL_Rect rect;
Glyph *next;
};
struct Font {
char name[MAX_NAME_LENGTH];
SDL_Texture *texture;
Glyph glyphHead[NUM_GLYPH_BUCKETS];
SDL_Rect glyphs[MAX_GLYPHS];
Font *next;
};

238
src/system/text.c
View File

@ -20,44 +20,47 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include "text.h"
static void initFont(char *name, char *filename);
static void initFont(char *name, char *filename, char *characters);
static void drawWord(char *word, int *x, int *y, int startX);
static void drawTextLines(int x, int y, int size, int align);
static void drawTextLine(int x, int y, int size, int align, const char *line);
void calcTextDimensions(const char *text, int size, int *w, int *h);
void useFont(char *name);
static void initChars(Font *f);
static char *nextCharacter(const char *str, int *i);
static Glyph *findGlyph(char *c);
static int nextGlyph(const char *str, int *i, char *glyphBuffer);
static char drawTextBuffer[1024];
static Font fontHead;
static Font *fontTail;
static Font *activeFont = NULL;
static float scale;
static char character[MAX_NAME_LENGTH];
void initFonts(void)
{
char *characters;
memset(&fontHead, 0, sizeof(Font));
fontTail = &fontHead;
initFont("roboto", getFileLocation("data/fonts/Roboto-Medium.ttf"));
characters = readFile("data/locale/characters.dat");
initFont("khosrau", getFileLocation("data/fonts/Khosrau.ttf"));
initFont("roboto", getFileLocation("data/fonts/Roboto-Medium.ttf"), characters);
initFont("khosrau", getFileLocation("data/fonts/Khosrau.ttf"), characters);
useFont("roboto");
free(characters);
}
static void initFont(char *name, char *filename)
static void initFont(char *name, char *filename, char *characters)
{
SDL_Texture *texture;
TTF_Font *font;
Font *f;
SDL_Surface *surface, *text;
SDL_Rect dest;
Glyph *g;
int i;
int i, n, largest;
char glyphBuffer[MAX_GLYPH_SIZE];
SDL_Color white = {255, 255, 255, 255};
f = malloc(sizeof(Font));
@ -65,43 +68,48 @@ static void initFont(char *name, char *filename)
font = TTF_OpenFont(filename, FONT_SIZE);
initChars(f);
surface = SDL_CreateRGBSurface(0, FONT_TEXTURE_SIZE, FONT_TEXTURE_SIZE, 32, 0, 0, 0, 0xff);
SDL_SetColorKey(surface, SDL_TRUE, SDL_MapRGBA(surface->format, 0, 0, 0, 0));
dest.x = dest.y = 0;
for (i = 0 ; i < NUM_GLYPH_BUCKETS ; i++)
largest = 0;
i = 0;
n = nextGlyph(characters, &i, glyphBuffer);
while (n)
{
for (g = f->glyphHead[i].next ; g != NULL ; g = g->next)
largest = MAX(largest, n);
text = TTF_RenderUTF8_Blended(font, glyphBuffer, white);
TTF_SizeText(font, glyphBuffer, &dest.w, &dest.h);
if (dest.x + dest.w >= FONT_TEXTURE_SIZE)
{
text = TTF_RenderUTF8_Blended(font, g->character, white);
dest.x = 0;
TTF_SizeText(font, g->character, &dest.w, &dest.h);
dest.y += dest.h + 1;
if (dest.x + dest.w >= FONT_TEXTURE_SIZE)
if (dest.y + dest.h >= FONT_TEXTURE_SIZE)
{
dest.x = 0;
dest.y += dest.h + 1;
if (dest.y + dest.h >= FONT_TEXTURE_SIZE)
{
SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_CRITICAL, "Out of glyph space in %dx%d font atlas texture map.", FONT_TEXTURE_SIZE, FONT_TEXTURE_SIZE);
exit(1);
}
SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_CRITICAL, "Out of glyph space in %dx%d font atlas texture map.", FONT_TEXTURE_SIZE, FONT_TEXTURE_SIZE);
exit(1);
}
SDL_BlitSurface(text, NULL, surface, &dest);
g->rect = dest;
SDL_FreeSurface(text);
dest.x += dest.w;
}
SDL_BlitSurface(text, NULL, surface, &dest);
f->glyphs[n] = dest;
SDL_FreeSurface(text);
dest.x += dest.w;
n = nextGlyph(characters, &i, glyphBuffer);
}
TTF_CloseFont(font);
@ -116,43 +124,6 @@ static void initFont(char *name, char *filename)
fontTail = f;
}
static void initChars(Font *f)
{
char *characters, *character;
Glyph *g, *glyphTail;
int i, bucket;
characters = readFile("data/locale/characters.dat");
i = 0;
character = nextCharacter(characters, &i);
while (character)
{
bucket = hashcode(character) % NUM_GLYPH_BUCKETS;
glyphTail = &f->glyphHead[bucket];
/* horrible bit to look for the tail */
while (glyphTail->next)
{
glyphTail = glyphTail->next;
}
g = malloc(sizeof(Glyph));
memset(g, 0, sizeof(Glyph));
glyphTail->next = g;
glyphTail = g;
STRNCPY(g->character, character, MAX_NAME_LENGTH);
character = nextCharacter(characters, &i);
}
free(characters);
}
void drawText(int x, int y, int size, int align, SDL_Color color, const char *format, ...)
{
va_list args;
@ -266,53 +237,28 @@ static void drawTextLine(int x, int y, int size, int align, const char *line)
static void drawWord(char *word, int *x, int *y, int startX)
{
int i;
char *character;
int i, n;
SDL_Rect dest;
Glyph *g;
i = 0;
character = nextCharacter(word, &i);
n = nextGlyph(word, &i, NULL);
while (character)
while (n)
{
g = findGlyph(character);
dest.x = *x;
dest.y = *y;
dest.w = g->rect.w * scale;
dest.h = g->rect.h * scale;
dest.w = activeFont->glyphs[n].w * scale;
dest.h = activeFont->glyphs[n].h * scale;
SDL_RenderCopy(app.renderer, activeFont->texture, &g->rect, &dest);
SDL_RenderCopy(app.renderer, activeFont->texture, &activeFont->glyphs[n], &dest);
*x += g->rect.w * scale;
*x += activeFont->glyphs[n].w * scale;
character = nextCharacter(word, &i);
n = nextGlyph(word, &i, NULL);
}
}
static Glyph *findGlyph(char *c)
{
Glyph *g;
int bucket;
bucket = hashcode(c) % NUM_GLYPH_BUCKETS;
for (g = activeFont->glyphHead[bucket].next ; g != NULL ; g = g->next)
{
if (strcmp(g->character, c) == 0)
{
return g;
}
}
SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_CRITICAL, "Couldn't find glyph for '%s'", c);
exit(1);
return NULL;
}
void useFont(char *name)
{
Font *f;
@ -330,9 +276,7 @@ void useFont(char *name)
void calcTextDimensions(const char *text, int size, int *w, int *h)
{
float scale;
int i;
char *character;
Glyph *g;
int i, n;
scale = size / (FONT_SIZE * 1.0f);
@ -341,16 +285,14 @@ void calcTextDimensions(const char *text, int size, int *w, int *h)
i = 0;
character = nextCharacter(text, &i);
n = nextGlyph(text, &i, NULL);
while (character)
while (n)
{
g = findGlyph(character);
*w += activeFont->glyphs[n].w * scale;
*h = MAX(activeFont->glyphs[n].h * scale, *h);
*w += g->rect.w * scale;
*h = MAX(g->rect.h * scale, *h);
character = nextCharacter(text, &i);
n = nextGlyph(text, &i, NULL);
}
}
@ -393,29 +335,57 @@ int getWrappedTextHeight(char *text, int size)
return y + h;
}
static char *nextCharacter(const char *str, int *i)
static int nextGlyph(const char *str, int *i, char *glyphBuffer)
{
unsigned char bit;
int n;
int n, len;
unsigned bit;
memset(character, '\0', MAX_NAME_LENGTH);
bit = (unsigned char)str[*i];
n = 0;
while (1)
if (bit < ' ')
{
bit = (unsigned char)str[*i];
if ((bit >= ' ' && bit <= '~') || bit >= 0xC0 || bit == '\0')
{
if (n > 0)
{
return character[0] != '\0' ? character : NULL;
}
}
character[n++] = str[*i];
*i = *i + 1;
return 0;
}
len = 1;
if (bit >= 0xF0)
{
bit = (int)(str[*i] & 0x07) << 18;
bit |= (int)(str[*i + 1] & 0x3F) << 12;
bit |= (int)(str[*i + 2] & 0x3F) << 6;
bit |= (int)(str[*i + 3] & 0x3F);
len = 4;
}
else if (bit >= 0xE0)
{
bit = (int)(str[*i] & 0x0F) << 12;
bit |= (int)(str[*i + 1] & 0x3F) << 6;
bit |= (int)(str[*i + 2] & 0x3F);
len = 3;
}
else if (bit >= 0xC0)
{
bit = (int)(str[*i] & 0x1F) << 6;
bit |= (int)(str[*i + 1] & 0x3F);
len = 2;
}
/* only fill the buffer if it's been supplied */
if (glyphBuffer != NULL)
{
memset(glyphBuffer, 0, MAX_GLYPH_SIZE);
for (n = 0 ; n < len ; n++)
{
glyphBuffer[n] = str[*i + n];
}
}
*i = *i + len;
return bit;
}

2
src/system/text.h
View File

@ -29,9 +29,9 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#define FONT_SIZE 32
#define FONT_TEXTURE_SIZE 512
#define MAX_WORD_LENGTH 128
#define MAX_GLYPH_SIZE 8
extern char *getFileLocation(char *filename);
extern unsigned long hashcode(const char *str);
extern char *readFile(char *filename);
extern SDL_Texture *toTexture(SDL_Surface *surface, int destroySurface);