From f75620d8d873af217fffd3c574463a1931ae54c1 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Tue, 03 Aug 2021 00:07:46 -0400
Subject: splash: Align text by the baseline

And factor out text rendering into a shared interface.
---
(limited to 'src/ttf.c')

diff --git a/src/ttf.c b/src/ttf.c
new file mode 100644
index 0000000..9cfaab0
--- /dev/null
+++ b/src/ttf.c
@@ -0,0 +1,74 @@
+/*
+ * 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 <stdlib.h>
+#include "ttf.h"
+
+SDL_Texture *
+mf_ttf_render(TTF_Font *font, const char *text, SDL_Color *color,
+		SDL_Renderer *renderer, SDL_Rect *rect)
+{
+	SDL_Surface *surface;
+	SDL_Texture *texture;
+	int          ascent;
+	int          max_y;
+	const char  *c;
+	int          glyph_max_y;
+
+	surface = TTF_RenderUTF8_Blended(font, text, *color);
+	if (surface == NULL) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't create surface: %s",
+				TTF_GetError());
+		return NULL;
+	}
+
+	texture = SDL_CreateTextureFromSurface(renderer, surface);
+	if (texture == NULL) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't create texture: %s",
+				SDL_GetError());
+		return NULL;
+	}
+
+	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;
+		}
+	}
+	rect->x = 0;
+	rect->y = ascent - max_y;
+	rect->w = surface->w;
+	rect->h = surface->h;
+
+	SDL_FreeSurface(surface);
+
+	return texture;
+}
--
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