diff options
Diffstat (limited to 'text.c')
| -rw-r--r-- | text.c | 40 |
1 files changed, 32 insertions, 8 deletions
@@ -178,16 +178,40 @@ void text_render_char(Font *font, char32_t c, TextRenderState *state) { stbtt_bakedchar *char_data = font->char_pages[page]; if (char_data) { // if page was successfully loaded stbtt_aligned_quad q = {0}; - // because stb_truetype uses down is positive, we need to negate the y - // coordinate, pass it into the function, then negate it back. - state->y = -state->y; stbtt_GetBakedQuad(char_data, font->tex_widths[page], font->tex_heights[page], (int)index, &state->x, &state->y, &q, 1); - state->y = -state->y; - glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,-q.y1); - glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,-q.y1); - glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,-q.y0); - glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,-q.y0); + float s0 = q.s0, t0 = q.t0; + float s1 = q.s1, t1 = q.t1; + float x0 = q.x0, y0 = q.y0; + float x1 = q.x1, y1 = q.y1; + float const min_x = state->min_x, max_x = state->max_x; + float const min_y = state->min_y, max_y = state->max_y; + if (x0 > max_x || y0 > max_y || x1 < min_x || y1 < min_y) + return; + if (x0 < min_x) { + // left side of character is clipped + s0 = (min_x-x0) / (x1-x0) * (s1-s0) + s0; + x0 = min_x; + } + if (x1 >= max_x) { + // right side of character is clipped + s1 = (max_x-x0) / (x1-x0) * (s1-s0) + s0; + x1 = max_x; + } + if (y0 < min_y) { + // top side of character is clipped + t0 = (min_y-y0) / (y1-y0) * (t1-t0) + t0; + y0 = min_y; + } + if (y1 >= max_y) { + // bottom side of character is clipped + t1 = (max_y-y0) / (y1-y0) * (t1-t0) + t0; + y1 = max_y; + } + glTexCoord2f(s0,t0); glVertex2f(x0,y0); + glTexCoord2f(s0,t1); glVertex2f(x0,y1); + glTexCoord2f(s1,t1); glVertex2f(x1,y1); + glTexCoord2f(s1,t0); glVertex2f(x1,y0); } } |