int main(void)
{
GRAPHICS_RESOURCE_HANDLE img;
uint32_t width, height;
int LAYER=1;
bcm_host_init();
int s;
s = gx_graphics_init(".");
assert(s == 0);
s = graphics_get_display_size(0, &width, &height);
assert(s == 0);
s = gx_create_window(0, width, height, GRAPHICS_RESOURCE_RGBA32, &img);
assert(s == 0);
// transparent before display to avoid screen flash
graphics_resource_fill(img, 0, 0, width, height, GRAPHICS_RGBA32(0,0,0,0x00));
graphics_display_resource(img, 0, LAYER, 0, 0, GRAPHICS_RESOURCE_WIDTH, GRAPHICS_RESOURCE_HEIGHT, VC_DISPMAN_ROT0, 1);
uint32_t text_size = 10;
while (1) {
const char *text = "The quick brown fox jumps over the lazy dog";
uint32_t y_offset = height-60+text_size/2;
graphics_resource_fill(img, 0, 0, width, height, GRAPHICS_RGBA32(0,0,0,0x00));
// blue, at the top (y=40)
graphics_resource_fill(img, 0, 40, width, 1, GRAPHICS_RGBA32(0,0,0xff,0xff));
// green, at the bottom (y=height-40)
graphics_resource_fill(img, 0, height-40, width, 1, GRAPHICS_RGBA32(0,0xff,0,0xff));
// draw the subtitle text
render_subtitle(img, text, 0, text_size, y_offset);
graphics_update_displayed_resource(img, 0, 0, 0, 0);
text_size += 1;
if (text_size > 50)
text_size = 10;
}
graphics_display_resource(img, 0, LAYER, 0, 0, GRAPHICS_RESOURCE_WIDTH, GRAPHICS_RESOURCE_HEIGHT, VC_DISPMAN_ROT0, 0);
graphics_delete_resource(img);
return 0;
}
int32_t render_subtitle(GRAPHICS_RESOURCE_HANDLE img, const char *text, const int skip, const uint32_t text_size, const uint32_t y_offset)
{
uint32_t text_length = strlen(text)-skip;
uint32_t width=0, height=0;
const char *split = text;
int32_t s=0;
int len = 0; // length of pre-subtitle
uint32_t img_w, img_h;
graphics_get_resource_size(img, &img_w, &img_h);
if (text_length==0)
return 0;
while (split[0]) {
s = graphics_resource_text_dimensions_ext(img, split, text_length-(split-text), &width, &height, text_size);
if (s != 0) return s;
if (width > img_w) {
const char *space = strnchr(split, text_length-(split-text), ' ');
if (!space) {
len = split+1-text;
split = split+1;
} else {
len = space-text;
split = space+1;
}
} else {
break;
}
}
// split now points to last line of text. split-text = length of initial text. text_length-(split-text) is length of last line
if (width) {
s = graphics_resource_render_text_ext(img, (img_w - width)>>1, y_offset-height,
GRAPHICS_RESOURCE_WIDTH,
GRAPHICS_RESOURCE_HEIGHT,
GRAPHICS_RGBA32(0xff,0xff,0xff,0xff), /* fg */
GRAPHICS_RGBA32(0,0,0,0x80), /* bg */
split, text_length-(split-text), text_size);
if (s!=0) return s;
}
return render_subtitle(img, text, skip+text_length-len, text_size, y_offset - height);
}
