A bit more code cleanup

src/display/bitmapfont.c

@@ -0,0 +1,120 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "bitmapfont.h"
+
+tilesetdiv_t * bitmapFontGetCharacterDivision(tileset_t *tileset,
+  char character
+) {
+  int32_t i = ((int32_t)character) - BITMAP_FONT_CHAR_START;
+  return tileset->divisions + i;
+}
+
+bitmapfontmeasure_t bitmapFontMeasure(char *string,
+  float charWidth, float charHeight
+) {
+  int32_t i;
+  float x, y;
+  char c;
+  bitmapfontmeasure_t measure = {
+    .height = 0, .lines = 1, .width = 0
+  };
+
+  i = 0;
+  y = 0;
+  x = 0;
+
+  while(true) {
+    c = string[i];
+    if(c == '\0') break;
+    i++;
+    
+    if(c == '\n') {
+      measure.width = mathMax(x, measure.width);
+      x = 0;
+      y += charHeight;
+      measure.lines++;
+      continue;
+    } else if(c == ' ') {
+      x += charWidth;
+      continue;
+    }
+
+    x += charWidth;
+  }
+
+  measure.width = mathMax(x, measure.width);
+  measure.height = y + charHeight;
+
+  return measure;
+}
+
+bitmapfontmeasure_t bitmapFontSpriteBatchBuffer(
+  spritebatch_t *batch, tileset_t *tileset,
+  char *string, float x, float y, float z, float charWidth, float charHeight
+) {
+  int32_t i;
+  char c;
+  tilesetdiv_t *div;
+  float cx, cy;
+  bitmapfontmeasure_t measure;
+
+  // Detect char dimensions
+  if(charWidth == -1) charWidth = tileset->divX * (charHeight / tileset->divY);
+  if(charHeight == -1) charHeight = tileset->divY * (charWidth / tileset->divX);
+
+  // Position the text.
+  if(x == BITMAP_FONT_CENTER_X ||
+     y == BITMAP_FONT_CENTER_Y ||
+     x == BITMAP_FONT_RIGHT_X
+  ) {
+    measure = bitmapFontMeasure(string, charWidth, charHeight);
+    if(x == BITMAP_FONT_CENTER_X) {
+      x = -(measure.width/2);
+    } else if(x == BITMAP_FONT_RIGHT_X) {
+      x = -measure.width;
+    }
+    if(y == BITMAP_FONT_CENTER_Y) y = -(measure.height/2);
+  }
+
+  // Begin buffering the sprite batch
+  measure.width = 0;
+  measure.height = 0;
+  measure.lines = 1;
+  i = 0;
+  cx = x, cy = y;
+
+  while(true) {
+    c = string[i];
+    if(c == '\0') break;
+    i++;
+    
+    // Special chars
+    if(c == '\n') {
+      measure.width = mathMax(cx-x, measure.width);
+      cx = x;
+      cy += charHeight;
+      measure.lines++;
+      continue;
+    } else if(c == ' ') {
+      cx += charWidth;
+      continue;
+    }
+
+    div = bitmapFontGetCharacterDivision(tileset, c);
+    spriteBatchQuad(batch, -1,
+      cx, cy, z, charWidth, charHeight,
+      div->x0, div->y1, div->x1, div->y0
+    );
+    cx += charWidth;
+  }
+
+  measure.width = mathMax(cx-x, measure.width);
+  measure.height = cy-y + charHeight;
+
+  return measure;
+}