Improved user font initialization in allegro5 backend
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74db09cdab
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@ -33,7 +33,8 @@ NK_API void nk_allegro5_del_image(struct nk_image* image);
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/* Fonts. We wrap normal allegro fonts in some nuklear book keeping */
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NK_API NkAllegro5Font* nk_allegro5_font_create_from_file(const char *file_name, int font_size, int flags);
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NK_API void nk_allegro5_font_del(NkAllegro5Font *font);
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NK_API struct nk_user_font* nk_allegro5_font(NkAllegro5Font *allegro5font);
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/* NOTE : just use NkAllegro5Font instead of nk_user_font,
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since the former just extends the latter*/
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NK_API void nk_allegro5_font_set_font(NkAllegro5Font *font);
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#endif
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@ -53,7 +54,6 @@ NK_API void nk_allegro5_font_set_font(NkAllegro5Font *font);
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struct NkAllegro5Font {
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struct nk_user_font nk;
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int height;
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ALLEGRO_FONT *font;
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};
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@ -95,6 +95,23 @@ NK_API void nk_allegro5_del_image(struct nk_image* image)
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free(image);
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}
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static float
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nk_allegro5_font_get_text_width(nk_handle handle, float height, const char *text, int len)
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{
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NkAllegro5Font *font = (NkAllegro5Font*)handle.ptr;
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if (!font || !text) {
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return 0;
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}
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/* We must copy into a new buffer with exact length null-terminated
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as nuklear uses variable size buffers and al_get_text_width doesn't
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accept a length, it infers length from null-termination
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(which is unsafe API design by allegro devs!) */
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char strcpy[len+1];
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strncpy((char*)&strcpy, text, len);
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strcpy[len] = '\0';
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return al_get_text_width(font->font, strcpy);
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}
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/* Flags are identical to al_load_font() flags argument */
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NK_API NkAllegro5Font*
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nk_allegro5_font_create_from_file(const char *file_name, int font_size, int flags)
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@ -118,34 +135,9 @@ nk_allegro5_font_create_from_file(const char *file_name, int font_size, int flag
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fprintf(stdout, "Unable to load font file: %s\n", file_name);
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return NULL;
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}
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font->height = al_get_font_line_height(font->font);
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return font;
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}
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static float
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nk_allegro5_font_get_text_width(nk_handle handle, float height, const char *text, int len)
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{
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NkAllegro5Font *font = (NkAllegro5Font*)handle.ptr;
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if (!font || !text) {
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return 0;
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}
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/* We must copy into a new buffer with exact length null-terminated
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as nuklear uses variable size buffers and al_get_text_width doesn't
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accept a length, it infers length from null-termination
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(which is unsafe API design by allegro devs!) */
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char strcpy[len+1];
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strncpy((char*)&strcpy, text, len);
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strcpy[len] = '\0';
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return al_get_text_width(font->font, strcpy);
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}
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NK_API struct nk_user_font*
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nk_allegro5_font(NkAllegro5Font *allegro5font)
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{
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struct nk_user_font *font = &allegro5font->nk;
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font->userdata = nk_handle_ptr(allegro5font);
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font->height = (float)allegro5font->height;
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font->width = nk_allegro5_font_get_text_width;
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font->nk.userdata = nk_handle_ptr(font);
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font->nk.height = (float)al_get_font_line_height(font->font);
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font->nk.width = nk_allegro5_font_get_text_width;
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return font;
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}
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@ -153,9 +145,6 @@ NK_API void
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nk_allegro5_font_set_font(NkAllegro5Font *allegro5font)
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{
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struct nk_user_font *font = &allegro5font->nk;
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font->userdata = nk_handle_ptr(allegro5font);
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font->height = (float)allegro5font->height;
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font->width = nk_allegro5_font_get_text_width;
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nk_style_set_font(&allegro5.ctx, font);
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}
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@ -475,9 +464,6 @@ nk_allegro5_init(NkAllegro5Font *allegro5font, ALLEGRO_DISPLAY *dsp,
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}
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struct nk_user_font *font = &allegro5font->nk;
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font->userdata = nk_handle_ptr(allegro5font);
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font->height = (float)allegro5font->height;
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font->width = nk_allegro5_font_get_text_width;
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allegro5.dsp = dsp;
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allegro5.width = width;
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