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Improve text width calculation precision (#1408) 

In some extreme cases (~30000 chars) text width precision takes a hit.
Using double instead of float fixes that.
This commit is contained in:
Guldoman 2023-03-09 16:48:46 +01:00 committed by George Sokianos
parent 193871869d
commit 7907fa785c
5 changed files with 12 additions and 12 deletions
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2
src/api/renderer.c
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@ -345,7 +345,7 @@ static int f_draw_text(lua_State *L) {
size_t len;
const char *text = luaL_checklstring(L, 2, &len);
float x = luaL_checknumber(L, 3);
double x = luaL_checknumber(L, 3);
int y = luaL_checknumber(L, 4);
RenColor color = checkcolor(L, 5, 255);
x = rencache_draw_text(&window_renderer, fonts, text, len, x, y, color);

4
src/rencache.c
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@ -191,9 +191,9 @@ void rencache_draw_rect(RenRect rect, RenColor color) {
}
}
float rencache_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, float x, int y, RenColor color)
double rencache_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, double x, int y, RenColor color)
{
float width = ren_font_group_get_width(window_renderer, fonts, text, len);
double width = ren_font_group_get_width(window_renderer, fonts, text, len);
RenRect rect = { x, y, (int)width, ren_font_group_get_height(fonts) };
if (rects_overlap(last_clip_rect, rect)) {
int sz = len + 1;

2
src/rencache.h
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@ -8,7 +8,7 @@
void rencache_show_debug(bool enable);
void rencache_set_clip_rect(RenRect rect);
void rencache_draw_rect(RenRect rect, RenColor color);
float rencache_draw_text(RenWindow *window_renderer, RenFont **font, const char *text, size_t len, float x, int y, RenColor color);
double rencache_draw_text(RenWindow *window_renderer, RenFont **font, const char *text, size_t len, double x, int y, RenColor color);
void rencache_invalidate(void);
void rencache_begin_frame(RenWindow *window_renderer);
void rencache_end_frame(RenWindow *window_renderer);

12
src/renderer.c
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@ -360,8 +360,8 @@ int ren_font_group_get_height(RenFont **fonts) {
return fonts[0]->height;
}
float ren_font_group_get_width(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len) {
float width = 0;
double ren_font_group_get_width(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len) {
double width = 0;
const char* end = text + len;
GlyphMetric* metric = NULL; GlyphSet* set = NULL;
while (text < end) {
@ -376,12 +376,12 @@ float ren_font_group_get_width(RenWindow *window_renderer, RenFont **fonts, cons
return width / surface_scale;
}
float ren_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, float x, int y, RenColor color) {
double ren_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, float x, int y, RenColor color) {
SDL_Surface *surface = renwin_get_surface(window_renderer);
const RenRect clip = window_renderer->clip;
const int surface_scale = renwin_surface_scale(window_renderer);
float pen_x = x * surface_scale;
double pen_x = x * surface_scale;
y *= surface_scale;
int bytes_per_pixel = surface->format->BytesPerPixel;
const char* end = text + len;
@ -389,7 +389,7 @@ float ren_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *tex
int clip_end_x = clip.x + clip.width, clip_end_y = clip.y + clip.height;
RenFont* last = NULL;
float last_pen_x = x;
double last_pen_x = x;
bool underline = fonts[0]->style & FONT_STYLE_UNDERLINE;
bool strikethrough = fonts[0]->style & FONT_STYLE_STRIKETHROUGH;
@ -453,7 +453,7 @@ float ren_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *tex
if(!last) last = font;
else if(font != last || text == end) {
float local_pen_x = text == end ? pen_x + adv : pen_x;
double local_pen_x = text == end ? pen_x + adv : pen_x;
if (underline)
ren_draw_rect(window_renderer, (RenRect){last_pen_x, y / surface_scale + last->height - 1, (local_pen_x - last_pen_x) / surface_scale, last->underline_thickness * surface_scale}, color);
if (strikethrough)

4
src/renderer.h
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@ -33,8 +33,8 @@ 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);
float ren_font_group_get_width(RenWindow *window_renderer, RenFont **font, const char *text, size_t len);
float ren_draw_text(RenWindow *window_renderer, RenFont **font, const char *text, size_t len, float x, int y, RenColor color);
double ren_font_group_get_width(RenWindow *window_renderer, RenFont **font, const char *text, size_t len);
double ren_draw_text(RenWindow *window_renderer, RenFont **font, const char *text, size_t len, float x, int y, RenColor color);
void ren_draw_rect(RenWindow *window_renderer, RenRect rect, RenColor color);