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Use x offset to define render command rect in `rencache_draw_text` (#1618) 

* Return x offset for the first character in `ren_font_group_get_width`

* Use x offset to define render command rect in `rencache_draw_text`
This commit is contained in:
Guldoman 2023-11-29 21:44:48 +01:00 committed by George Sokianos
parent e14af4604a
commit 5719f4de6f
4 changed files with 14 additions and 5 deletions
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2
src/api/renderer.c
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@ -198,7 +198,7 @@ static int f_font_get_width(lua_State *L) {
size_t len;
const char *text = luaL_checklstring(L, 2, &len);
lua_pushnumber(L, ren_font_group_get_width(&window_renderer, fonts, text, len));
lua_pushnumber(L, ren_font_group_get_width(&window_renderer, fonts, text, len, NULL));
return 1;
}

5
src/rencache.c
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@ -191,8 +191,9 @@ void rencache_draw_rect(RenWindow *window_renderer, RenRect rect, RenColor color
double rencache_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, double x, int y, RenColor color)
{
double width = ren_font_group_get_width(window_renderer, fonts, text, len);
RenRect rect = { x, y, (int)width, ren_font_group_get_height(fonts) };
int x_offset;
double width = ren_font_group_get_width(window_renderer, fonts, text, len, &x_offset);
RenRect rect = { x + x_offset, y, (int)(width - x_offset), ren_font_group_get_height(fonts) };
if (rects_overlap(last_clip_rect, rect)) {
int sz = len + 1;
DrawTextCommand *cmd = push_command(window_renderer, DRAW_TEXT, sizeof(DrawTextCommand) + sz);

10
src/renderer.c
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@ -348,10 +348,11 @@ int ren_font_group_get_height(RenFont **fonts) {
return fonts[0]->height;
}
double ren_font_group_get_width(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len) {
double ren_font_group_get_width(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, int *x_offset) {
double width = 0;
const char* end = text + len;
GlyphMetric* metric = NULL; GlyphSet* set = NULL;
bool set_x_offset = x_offset == NULL;
while (text < end) {
unsigned int codepoint;
text = utf8_to_codepoint(text, &codepoint);
@ -359,8 +360,15 @@ double ren_font_group_get_width(RenWindow *window_renderer, RenFont **fonts, con
if (!metric)
break;
width += (!font || metric->xadvance) ? metric->xadvance : fonts[0]->space_advance;
if (!set_x_offset) {
set_x_offset = true;
*x_offset = metric->bitmap_left; // TODO: should this be scaled by the surface scale?
}
}
const int surface_scale = renwin_get_surface(window_renderer).scale;
if (!set_x_offset) {
*x_offset = 0;
}
return width / surface_scale;
}

2
src/renderer.h
View File

@ -34,7 +34,7 @@ int ren_font_group_get_height(RenFont **font);
float ren_font_group_get_size(RenFont **font);
void ren_font_group_set_size(RenWindow *window_renderer, RenFont **font, float size);
void ren_font_group_set_tab_size(RenFont **font, int n);
double ren_font_group_get_width(RenWindow *window_renderer, RenFont **font, const char *text, size_t len);
double ren_font_group_get_width(RenWindow *window_renderer, RenFont **font, const char *text, size_t len, int *x_offset);
double ren_draw_text(RenSurface *rs, RenFont **font, const char *text, size_t len, float x, int y, RenColor color);
void ren_draw_rect(RenSurface *rs, RenRect rect, RenColor color);