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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/renderer.h
+20 -2
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@@ -21,6 +21,19 @@ enum {
typedef struct { uint8_t b, g, r, a; } RenColor;
typedef struct { int x, y, width, height; } RenRect;
struct CPReplace {
unsigned codepoint_src;
unsigned codepoint_dst;
};
typedef struct CPReplace CPReplace;
struct CPReplaceTable {
int size;
CPReplace *replacements;
};
typedef struct CPReplaceTable CPReplaceTable;
void ren_init(SDL_Window *win);
void ren_update_rects(RenRect *rects, int count);
@@ -41,7 +54,12 @@ int ren_font_subpixel_round(int width, int subpixel_scale, int orientation);
void ren_draw_rect(RenRect rect, RenColor color);
void ren_draw_image(RenImage *image, RenRect *sub, int x, int y, RenColor color);
void ren_draw_text(RenFont *font, const char *text, int x, int y, RenColor color);
void ren_draw_text_subpixel(RenFont *font, const char *text, int x_subpixel, int y, RenColor color);
void ren_draw_text(RenFont *font, const char *text, int x, int y, RenColor color, CPReplaceTable *replacements, RenColor replace_color);
void ren_draw_text_subpixel(RenFont *font, const char *text, int x_subpixel, int y, RenColor color, CPReplaceTable *replacements, RenColor replace_color);
void ren_cp_replace_init(CPReplaceTable *rep_table);
void ren_cp_replace_free(CPReplaceTable *rep_table);
void ren_cp_replace_add(CPReplaceTable *rep_table, const char *src, const char *dst);
void ren_cp_replace_clear(CPReplaceTable *rep_table);
#endif