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ex_ttf.c
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ex_ttf.c
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#define ALLEGRO_UNSTABLE
#include <stdio.h>
#include <allegro5/allegro.h>
#include <allegro5/allegro_ttf.h>
#include <allegro5/allegro_primitives.h>
#include <allegro5/allegro_image.h>
#include "common.c"
#define MAX_RANGES 256
const char *font_file = "data/DejaVuSans.ttf";
struct Example
{
double fps;
ALLEGRO_FONT *f1, *f2, *f3, *f4, *f5, *f6;
ALLEGRO_FONT *f_alex;
ALLEGRO_CONFIG *config;
int ranges_count;
} ex;
static void print_ranges(ALLEGRO_FONT *f)
{
int ranges[MAX_RANGES * 2];
int count;
int i;
count = al_get_font_ranges(f, MAX_RANGES, ranges);
for (i = 0; i < count; i++) {
int begin = ranges[i * 2];
int end = ranges[i * 2 + 1];
log_printf("range %3d: %08x-%08x (%d glyph%s)\n", i, begin, end,
1 + end - begin, begin == end ? "" : "s");
}
}
static const char *get_string(const char *key)
{
const char *v = al_get_config_value(ex.config, "", key);
return (v) ? v : key;
}
static int ustr_at(ALLEGRO_USTR *string, int index)
{
return al_ustr_get(string, al_ustr_offset(string, index));
}
static void render(void)
{
ALLEGRO_COLOR white = al_map_rgba_f(1, 1, 1, 1);
ALLEGRO_COLOR black = al_map_rgba_f(0, 0, 0, 1);
ALLEGRO_COLOR red = al_map_rgba_f(1, 0, 0, 1);
ALLEGRO_COLOR green = al_map_rgba_f(0, 0.5, 0, 1);
ALLEGRO_COLOR blue = al_map_rgba_f(0.1, 0.2, 1, 1);
ALLEGRO_COLOR purple = al_map_rgba_f(0.3, 0.1, 0.2, 1);
int x, y, w, h, as, de, xpos, ypos;
unsigned int index;
int target_w, target_h;
ALLEGRO_USTR_INFO info, sub_info;
const ALLEGRO_USTR *u;
ALLEGRO_USTR *tulip = al_ustr_new("Tulip");
ALLEGRO_USTR *dimension_text = al_ustr_new("Tulip");
ALLEGRO_USTR *vertical_text = al_ustr_new("Rose.");
ALLEGRO_USTR *dimension_label = al_ustr_new("(dimensions)");
int prev_cp = -1;
al_clear_to_color(white);
al_hold_bitmap_drawing(true);
al_draw_textf(ex.f1, black, 50, 20, 0, "Tulip (kerning)");
al_draw_textf(ex.f2, black, 50, 80, 0, "Tulip (no kerning)");
x = 50;
y = 140;
for (index = 0; index < al_ustr_length(dimension_text); index ++) {
int cp = ustr_at(dimension_text, index);
int bbx, bby, bbw, bbh;
al_get_glyph_dimensions(ex.f2, cp, &bbx, &bby, &bbw, &bbh);
al_draw_rectangle(x + bbx + 0.5, y + bby + 0.5, x + bbx + bbw - 0.5, y + bby + bbh - 0.5, blue, 1);
al_draw_rectangle(x + 0.5, y + 0.5, x + bbx + bbw - 0.5, y + bby + bbh - 0.5, green, 1);
al_draw_glyph(ex.f2, purple, x, y, cp);
x += al_get_glyph_advance(ex.f2, cp, ALLEGRO_NO_KERNING);
}
al_draw_line(50.5, y+0.5, x+0.5, y+0.5, red, 1);
for (index = 0; index < al_ustr_length(dimension_label); index++) {
int cp = ustr_at(dimension_label, index);
ALLEGRO_GLYPH g;
if (al_get_glyph(ex.f2, prev_cp, cp, &g)) {
al_draw_tinted_bitmap_region(g.bitmap, black, g.x, g.y, g.w, g.h, x + 10 + g.kerning + g.offset_x, y + g.offset_y, 0);
x += g.advance;
}
prev_cp = cp;
}
al_draw_textf(ex.f3, black, 50, 200, 0, "This font has a size of 12 pixels, "
"the one above has 48 pixels.");
al_hold_bitmap_drawing(false);
al_hold_bitmap_drawing(true);
al_draw_textf(ex.f3, red, 50, 220, 0, "The color can simply be changed.🐊← fallback glyph");
al_hold_bitmap_drawing(false);
al_hold_bitmap_drawing(true);
al_draw_textf(ex.f3, green, 50, 240, 0, "Some unicode symbols:");
al_draw_textf(ex.f3, green, 50, 260, 0, "%s", get_string("symbols1"));
al_draw_textf(ex.f3, green, 50, 280, 0, "%s", get_string("symbols2"));
al_draw_textf(ex.f3, green, 50, 300, 0, "%s", get_string("symbols3"));
#define OFF(x) al_ustr_offset(u, x)
#define SUB(x, y) al_ref_ustr(&sub_info, u, OFF(x), OFF(y))
u = al_ref_cstr(&info, get_string("substr1"));
al_draw_ustr(ex.f3, green, 50, 320, 0, SUB(0, 6));
u = al_ref_cstr(&info, get_string("substr2"));
al_draw_ustr(ex.f3, green, 50, 340, 0, SUB(7, 11));
u = al_ref_cstr(&info, get_string("substr3"));
al_draw_ustr(ex.f3, green, 50, 360, 0, SUB(4, 11));
u = al_ref_cstr(&info, get_string("substr4"));
al_draw_ustr(ex.f3, green, 50, 380, 0, SUB(0, 11));
al_draw_textf(ex.f5, black, 50, 395, 0, "forced monochrome");
ALLEGRO_TRANSFORM t;
al_identity_transform(&t);
al_rotate_transform(&t, al_get_time());
al_translate_transform(&t, 550, 300);
al_use_transform(&t);
al_draw_textf(ex.f6, black, 0, -al_get_font_line_height(ex.f6) / 2,
ALLEGRO_ALIGN_CENTRE, "T");
al_identity_transform(&t);
al_use_transform(&t);
/* Glyph rendering tests. */
al_draw_textf(ex.f3, red, 50, 410, 0, "Glyph adv Tu: %d, draw: ",
al_get_glyph_advance(ex.f3, 'T', 'u'));
x = 50;
y = 425;
for (index = 0; index < al_ustr_length(tulip); index ++) {
int cp = ustr_at(tulip, index);
/* Use al_get_glyph_advance for the stride, with no kerning. */
al_draw_glyph(ex.f3, red, x, y, cp);
x += al_get_glyph_advance(ex.f3, cp, ALLEGRO_NO_KERNING);
}
x = 50;
y = 440;
/* First draw a red string using al_draw_text, that should be hidden
* completely by the same text drawing in green per glyph
* using al_draw_glyph and al_get_glyph_advance below. */
al_draw_ustr(ex.f3, red, x, y, 0, tulip);
for (index = 0; index < al_ustr_length(tulip); index ++) {
int cp = ustr_at(tulip, index);
int ncp = (index < (al_ustr_length(tulip) - 1)) ?
ustr_at(tulip, index + 1) : ALLEGRO_NO_KERNING;
/* Use al_get_glyph_advance for the stride and apply kerning. */
al_draw_glyph(ex.f3, green, x, y, cp);
x += al_get_glyph_advance(ex.f3, cp, ncp);
}
x = 50;
y = 466;
al_draw_ustr(ex.f3, red, x, y, 0, tulip);
for (index = 0; index < al_ustr_length(tulip); index ++) {
int cp = ustr_at(tulip, index);
int bbx, bby, bbw, bbh;
al_get_glyph_dimensions(ex.f3, cp, &bbx, &bby, &bbw, &bbh);
al_draw_glyph(ex.f3, blue, x, y, cp);
x += bbx + bbw;
}
x = 10;
y = 30;
for (index = 0; index < al_ustr_length(vertical_text); index ++) {
int bbx, bby, bbw, bbh;
int cp = ustr_at(vertical_text, index);
/* Use al_get_glyph_dimensions for the height to apply. */
al_get_glyph_dimensions(ex.f3, cp, &bbx, &bby, &bbw, &bbh);
al_draw_glyph(ex.f3, green, x, y, cp);
y += bby;
y += bbh;
}
x = 30;
y = 30;
for (index = 0; index < al_ustr_length(vertical_text); index ++) {
int bbx, bby, bbw, bbh;
int cp = ustr_at(vertical_text, index);
/* Use al_get_glyph_dimensions for the height to apply, here bby is
* omited for the wrong result. */
al_get_glyph_dimensions(ex.f3, cp, &bbx, &bby, &bbw, &bbh);
al_draw_glyph(ex.f3, red, x, y, cp);
y += bbh;
}
al_hold_bitmap_drawing(false);
target_w = al_get_bitmap_width(al_get_target_bitmap());
target_h = al_get_bitmap_height(al_get_target_bitmap());
xpos = target_w - 10;
ypos = target_h - 10;
al_get_text_dimensions(ex.f4, "Allegro", &x, &y, &w, &h);
as = al_get_font_ascent(ex.f4);
de = al_get_font_descent(ex.f4);
xpos -= w;
ypos -= h;
x += xpos;
y += ypos;
al_draw_rectangle(x, y, x + w - 0.5, y + h - 0.5, black, 0);
al_draw_line(x+0.5, y + as + 0.5, x + w - 0.5, y + as + 0.5, black, 0);
al_draw_line(x + 0.5, y + as + de + 0.5, x + w - 0.5, y + as + de + 0.5, black, 0);
al_hold_bitmap_drawing(true);
al_draw_textf(ex.f4, blue, xpos, ypos, 0, "Allegro");
al_hold_bitmap_drawing(false);
al_hold_bitmap_drawing(true);
al_draw_textf(ex.f3, black, target_w, 0, ALLEGRO_ALIGN_RIGHT,
"%.1f FPS", ex.fps);
al_draw_textf(ex.f3, black, 0, 0, 0, "%s: %d unicode ranges", font_file,
ex.ranges_count);
al_hold_bitmap_drawing(false);
}
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display;
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT_QUEUE *queue;
int redraw = 0;
double t = 0;
if (!al_init()) {
abort_example("Could not init Allegro.\n");
}
open_log_monospace();
al_init_primitives_addon();
al_install_mouse();
al_init_font_addon();
al_init_ttf_addon();
al_init_image_addon();
init_platform_specific();
#ifdef ALLEGRO_IPHONE
al_set_new_display_flags(ALLEGRO_FULLSCREEN_WINDOW);
#endif
display = al_create_display(640, 480);
if (!display) {
abort_example("Could not create display.\n");
}
al_install_keyboard();
if (argc >= 2) {
font_file = argv[1];
}
ex.f1 = al_load_font(font_file, 48, 0);
ex.f2 = al_load_font(font_file, 48, ALLEGRO_TTF_NO_KERNING);
ex.f3 = al_load_font(font_file, 12, 0);
/* Specifying negative values means we specify the glyph height
* in pixels, not the usual font size.
*/
ex.f4 = al_load_font(font_file, -140, 0);
ex.f5 = al_load_font(font_file, 12, ALLEGRO_TTF_MONOCHROME);
al_set_new_bitmap_flags(ALLEGRO_MIN_LINEAR | ALLEGRO_MAG_LINEAR);
ex.f6 = al_load_font(font_file, -140, 0);
al_set_new_bitmap_flags(0);
{
int ranges[] = {0x1F40A, 0x1F40A};
ALLEGRO_BITMAP *icon = al_load_bitmap("data/icon.png");
if (!icon) {
abort_example("Couldn't load data/icon.png.\n");
}
ALLEGRO_BITMAP *glyph = al_create_bitmap(50, 50);
al_set_target_bitmap(glyph);
al_clear_to_color(al_map_rgba_f(0, 0, 0, 0));
al_draw_rectangle(0.5, 0.5, 49.5, 49.5, al_map_rgb_f(1, 1, 0),
1);
al_draw_bitmap(icon, 1, 1, 0);
al_set_target_backbuffer(display);
ex.f_alex = al_grab_font_from_bitmap(glyph, 1, ranges);
}
if (!ex.f1 || !ex.f2 || !ex.f3 || !ex.f4 || !ex.f_alex) {
abort_example("Could not load font: %s\n", font_file);
}
al_set_fallback_font(ex.f3, ex.f_alex);
ex.ranges_count = al_get_font_ranges(ex.f1, 0, NULL);
print_ranges(ex.f1);
ex.config = al_load_config_file("data/ex_ttf.ini");
if (!ex.config) {
abort_example("Could not data/ex_ttf.ini\n");
}
timer = al_create_timer(1.0 / 60);
queue = al_create_event_queue();
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_display_event_source(display));
al_register_event_source(queue, al_get_timer_event_source(timer));
al_start_timer(timer);
while (true) {
ALLEGRO_EVENT event;
al_wait_for_event(queue, &event);
if (event.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
break;
if (event.type == ALLEGRO_EVENT_KEY_DOWN &&
event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
break;
}
if (event.type == ALLEGRO_EVENT_TIMER)
redraw++;
while (redraw > 0 && al_is_event_queue_empty(queue)) {
double dt;
redraw--;
dt = al_get_time();
render();
dt = al_get_time() - dt;
t = 0.99 * t + 0.01 * dt;
ex.fps = 1.0 / t;
al_flip_display();
}
}
al_destroy_font(ex.f1);
al_destroy_font(ex.f2);
al_destroy_font(ex.f3);
al_destroy_font(ex.f4);
al_destroy_font(ex.f5);
al_destroy_config(ex.config);
close_log(false);
return 0;
}
/* vim: set sts=4 sw=4 et: */