Connect the window and font code to the editor's main function

1 files changed, 137 insertions, 0 deletions

diff --git a/font.c b/font.c
new file mode 100644
index 0000000..00b7f4d
--- /dev/null
+++ b/font.c
@@ -0,0 +1,137 @@
+#include "font.h"
+
+/* Create a texture containing all of the glyphs in a specified BDF file. */
+SDL_Texture *font_create_texture(SDL_Renderer *renderer, BDFFontInfo *font)
+{
+	SDL_Texture *result;
+	SDL_Surface *surface = SDL_CreateRGBSurface(0, 8 * font->num_chars, font->bounds.h, 32, 0, 0, 0, 0);
+
+	printf("Made surface of size %dx%d\n", surface->w, surface->h);
+	SDL_LockSurface(surface);
+	for (int i = 0; i < font->num_chars; i++) {
+		BDFFontChar chair = font->chars[i];
+		for (int y = 0; y < font->bounds.h; y++) {
+			int bits_for_row = chair.bitmap[y];
+			for (int x = 0; x < 8; x++) {
+				int bit_index = 7 - x;
+				int current_bit = bits_for_row & (1 << bit_index);
+				int xp = x + i * 8;
+				int yp = y;
+				((Uint32*)(surface->pixels))[xp + yp * surface->w] = current_bit ? 0xffffffff : 0;
+			}
+		}
+	}
+	SDL_UnlockSurface(surface);
+
+	result = SDL_CreateTextureFromSurface(renderer, surface);
+	if (result == NULL) {
+		fprintf(stderr, "Failed to create texture: %s\n", SDL_GetError());
+	}
+	SDL_FreeSurface(surface);
+	return result;
+}
+
+/* 
+ * Loads a BDF font file into a data structure.
+ * TODO: This is extremely atrocious!
+ */
+BDFFontInfo font_load(const char *filename)
+{
+	FILE *fp;
+	char *line = NULL;
+	size_t len = 0;
+	ssize_t bytes_read;
+
+	BDFFontInfo result;
+	result.bounds.x = 0;
+	result.bounds.y = 0;
+	result.bounds.w = 0;
+	result.bounds.h = 0;
+	result.chars = NULL;
+	result.num_chars = 0;
+
+	fp = fopen(filename, "r");
+	if (fp == NULL) {
+		fprintf(stderr, "Failed to open file from %s\n", filename);
+		return;
+	}
+
+	int is_reading_bitmap = 0;
+	int char_counter = -1;
+	while ((bytes_read = getline(&line, &len, fp)) != -1) {
+		if (strncmp(line, "FONTBOUNDINGBOX", 15) == 0) {
+			sscanf(line, "FONTBOUNDINGBOX %d %d %d %d\n", &result.bounds.w,
+					                                      &result.bounds.h,
+					                                      &result.bounds.x,
+					                                      &result.bounds.y);
+
+		}
+
+		if (strncmp(line, "CHARS", 5) == 0) {
+			sscanf(line, "CHARS %d\n", &result.num_chars);
+			result.chars = malloc(result.num_chars * sizeof(BDFFontChar));
+		}
+
+		if (strncmp(line, "STARTCHAR", 9) == 0) {
+			char_counter++;
+			result.chars[char_counter].code_point = 0;
+			result.chars[char_counter].next_glyph_offset.x = 0;
+			result.chars[char_counter].next_glyph_offset.y = 0;
+			result.chars[char_counter].bounds.x = 0;
+			result.chars[char_counter].bounds.y = 0;
+			result.chars[char_counter].bounds.w = 0;
+			result.chars[char_counter].bounds.h = 0;
+			result.chars[char_counter].bitmap = NULL;
+			result.chars[char_counter].bitmap_size = 0;
+		}
+
+		if (strncmp(line, "ENCODING", 8) == 0) {
+			int code_point = 0;
+			sscanf(line, "ENCODING %d\n", &code_point);
+			if (code_point < 256)
+				result.char_index_for_code_point[code_point] = char_counter;
+			result.chars[char_counter].code_point = code_point;
+		}
+
+		if (strncmp(line, "DWIDTH", 6) == 0) {
+			sscanf(line, "DWIDTH %d %d\n", &result.chars[char_counter].next_glyph_offset.x,
+				                          &result.chars[char_counter].next_glyph_offset.y);
+		}
+
+		if (strncmp(line, "BBX", 3) == 0) {
+			sscanf(line, "BBX %d %d %d %d\n", &result.chars[char_counter].bounds.w,
+					                          &result.chars[char_counter].bounds.h,
+					                          &result.chars[char_counter].bounds.x,
+					                          &result.chars[char_counter].bounds.y);
+			result.chars[char_counter].bounds.x += char_counter * 8;
+			result.chars[char_counter].bounds.y = -result.chars[char_counter].bounds.y;
+		}
+
+		if (strncmp(line, "BITMAP", 6) == 0) {
+			is_reading_bitmap = 1;
+		}
+
+		if (is_reading_bitmap) {
+			if (strncmp(line, "ENDCHAR", 7) == 0) {
+				is_reading_bitmap = 0;
+				continue;
+			}
+
+			BDFFontChar *chair = &result.chars[char_counter];
+			chair->bitmap = realloc(chair->bitmap, chair->bitmap_size++);
+			chair->bitmap[chair->bitmap_size - 1] = strtol(line, NULL, 16);
+		}
+	}
+
+	fclose(fp);
+	if (line) { free(line); }
+
+	return result;
+}
+
+void font_destroy(BDFFontInfo *font)
+{
+	for (int i = 0; i < font->num_chars; i++)
+		free(font->chars[i].bitmap);
+	free(font->chars);
+}