diff options
| -rw-r--r-- | src/tk.h | 5 | ||||
| -rw-r--r-- | src/tk/label.c | 137 | ||||
| -rw-r--r-- | src/tk/local.mk | 1 |
3 files changed, 143 insertions, 0 deletions
@@ -21,6 +21,7 @@ #define MFTK_H_ #include <SDL.h> +#include <SDL_ttf.h> struct mftk_widget; @@ -43,4 +44,8 @@ mftk_widget_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y); void mftk_widget_destroy(struct mftk_widget **w); +struct mftk_widget * +mftk_label_new(TTF_Font *font, const char *text, SDL_Color *color, + SDL_Renderer *renderer); + #endif /* MFTK_H_ */ diff --git a/src/tk/label.c b/src/tk/label.c new file mode 100644 index 0000000..e9ae38c --- /dev/null +++ b/src/tk/label.c @@ -0,0 +1,137 @@ +/* + * Copyright (C) 2021 P. J. McDermott + * + * This file is part of Maze Fight + * + * Maze Fight is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * Maze Fight is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with Maze Fight. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <SDL.h> +#include <SDL_ttf.h> +#include "../tk.h" +#include "widget.h" + +struct mftk_label { + struct mftk_widget parent; + SDL_Texture *texture; + int y; + int h; +}; + +static void +_mftk_label_layout(struct mftk_widget *w __attribute__((__unused__))) +{ + /* Size set in constructor */ +} + +static int +_mftk_label_event(struct mftk_widget *w __attribute__((__unused__)), + SDL_Event *e __attribute__((__unused__))) +{ + /* No events */ + return 0; +} + +static int +_mftk_label_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y) +{ + struct mftk_label *l = (struct mftk_label *) w; + SDL_Rect rect; + + rect.x = x; + rect.y = l->y + y; + rect.w = w->w; + rect.h = l->h; + + if (SDL_RenderCopy(renderer, l->texture, NULL, &rect) < 0) { + SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, + "Couldn't render widget: %s", + SDL_GetError()); + return -1; + } + + return 0; +} + +static void +_mftk_label_destroy(struct mftk_widget *w) +{ + struct mftk_label *l = (struct mftk_label *) w; + + SDL_DestroyTexture(l->texture); +} + +struct mftk_widget * +mftk_label_new(TTF_Font *font, const char *text, SDL_Color *color, + SDL_Renderer *renderer) +{ + struct mftk_widget *w; + struct mftk_label *l; + SDL_Surface *surface; + int line_skip; + int ascent; + int max_y; + const char *c; + int glyph_max_y; + + if ((w = mftk_widget_new(sizeof(*l))) == NULL) return NULL; + l = (struct mftk_label *) w; + w->layout = &_mftk_label_layout; + w->event = &_mftk_label_event; + w->render = &_mftk_label_render; + w->destroy = &_mftk_label_destroy; + + surface = TTF_RenderUTF8_Blended(font, text, *color); + if (surface == NULL) { + SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, + "Couldn't create surface: %s", + TTF_GetError()); + free(l); + return NULL; + } + + l->texture = SDL_CreateTextureFromSurface(renderer, surface); + if (l->texture == NULL) { + SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, + "Couldn't create texture: %s", + SDL_GetError()); + SDL_FreeSurface(surface); + free(l); + return NULL; + } + + line_skip = TTF_FontLineSkip(font); + ascent = TTF_FontAscent (font); + max_y = 0; + for (c = text; *c != '\0'; ++c) { + if (TTF_GlyphMetrics(font, *c, NULL, NULL, NULL, &glyph_max_y, + NULL) < 0) { + SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, + "Couldn't get glyph metrics: %s", + SDL_GetError()); + continue; + } + if (glyph_max_y > max_y) { + max_y = glyph_max_y; + } + } + w->w = surface->w; + w->h = line_skip; + l->y = (line_skip - ascent) / 2 + (ascent - max_y); + l->h = surface->h; + + SDL_FreeSurface(surface); + + return w; +} diff --git a/src/tk/local.mk b/src/tk/local.mk index 39b1226..0c37299 100644 --- a/src/tk/local.mk +++ b/src/tk/local.mk @@ -1,3 +1,4 @@ mazefight_SOURCES += \ + %reldir%/label.c \ %reldir%/widget.c \ %reldir%/widget.h |