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Implement unicode character replacements

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Useful to draw whitespaces with alternate characters and colors
without slowing down the text rendering.

A new API is implemented. A renderer.replacements object can be created
to list the replacements.

In turns the function renderer.draw_text and draw_text_subpixel now accept
two optional arguments for replacements.
This commit is contained in:
Francesco Abbate
2021-04-01 18:05:59 +02:00
parent ed6ba64542
commit 3b040aabc7
14 changed files with 212 additions and 33 deletions
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src/rencache.c
+19 -7
View File
@@ -1,3 +1,4 @@
#include <stdint.h>
#include <stdio.h>
#include "rencache.h"
@@ -14,13 +15,16 @@
enum { FREE_FONT, SET_CLIP, DRAW_TEXT, DRAW_RECT, DRAW_TEXT_SUBPIXEL };
typedef struct {
int type, size;
int8_t type;
int8_t tab_size;
int8_t subpixel_scale;
int8_t x_subpixel_offset;
int32_t size;
RenRect rect;
RenColor color;
RenFont *font;
short int subpixel_scale;
short int x_subpixel_offset;
int tab_size;
CPReplaceTable *replacements;
RenColor replace_color;
char text[0];
} Command;
@@ -130,7 +134,10 @@ void rencache_draw_rect(RenRect rect, RenColor color) {
}
}
int rencache_draw_text(RenFont *font, const char *text, int x, int y, RenColor color, bool draw_subpixel) {
int rencache_draw_text(RenFont *font,
const char *text, int x, int y, RenColor color, bool draw_subpixel,
CPReplaceTable *replacements, RenColor replace_color)
{
int subpixel_scale;
int w_subpixel = ren_get_font_width(font, text, &subpixel_scale);
RenRect rect;
@@ -150,6 +157,8 @@ int rencache_draw_text(RenFont *font, const char *text, int x, int y, RenColor c
cmd->subpixel_scale = (draw_subpixel ? subpixel_scale : 1);
cmd->x_subpixel_offset = x - subpixel_scale * rect.x;
cmd->tab_size = ren_get_font_tab_size(font);
cmd->replacements = replacements;
cmd->replace_color = replace_color;
}
}
@@ -262,11 +271,14 @@ void rencache_end_frame(void) {
break;
case DRAW_TEXT:
ren_set_font_tab_size(cmd->font, cmd->tab_size);
ren_draw_text(cmd->font, cmd->text, cmd->rect.x, cmd->rect.y, cmd->color);
ren_draw_text(cmd->font, cmd->text, cmd->rect.x, cmd->rect.y, cmd->color,
cmd->replacements, cmd->replace_color);
break;
case DRAW_TEXT_SUBPIXEL:
ren_set_font_tab_size(cmd->font, cmd->tab_size);
ren_draw_text_subpixel(cmd->font, cmd->text, cmd->subpixel_scale * cmd->rect.x + cmd->x_subpixel_offset, cmd->rect.y, cmd->color);
ren_draw_text_subpixel(cmd->font, cmd->text,
cmd->subpixel_scale * cmd->rect.x + cmd->x_subpixel_offset, cmd->rect.y, cmd->color,
cmd->replacements, cmd->replace_color);
break;
}
}