Update the truncate number function to use decimal point (#333)

* Fixed to truncate as "1.234M" instead of "1234K"

* Optimized by switching to strings to avoid divisions

* Changed FP constants to strings

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

include/font.h

@@ -6,24 +6,16 @@
 #ifndef FONT_H
 #define FONT_H
 
-#include <tonc.h>
-
-extern const TFont gbalatro_sys8Font;
-extern const unsigned int gbalatro_sys8Glyphs[192];
-
 /** @name Decimal Point Fonts
  *  @brief A set of macros to map the fonts decimal-point values (e.g. ".1")
  *  to their replaced characters.
  *
  *  "FP#" -> Font "Point" "number"
  *
- *  This is used at compile time directly with the help of libtonc's XSTR() macro
- *  **Note**: This should **ONLY** be used with the XSTR() macro, otherwise it
- *  is undefined behavior.
  *
  *  For example:
  *  ```c
- *  tte_printf("Testing " XSTR(FP0_CHAR) " Something!");
+ *  tte_printf("Testing " FP0_STR " Something!");
  *  ```
  *  prints "Testing .0 Something!"
  *
@@ -44,16 +36,16 @@ extern const unsigned int gbalatro_sys8Glyphs[192];
  *
  * @{
  */
-#define FP0_CHAR & // .0
-#define FP1_CHAR ^ // .1
-#define FP2_CHAR } // .2
-#define FP3_CHAR { // .3
-#define FP4_CHAR | // .4
-#define FP5_CHAR ` // .5
-#define FP6_CHAR < // .6
-#define FP7_CHAR > // .7
-#define FP8_CHAR _ // .8
-#define FP9_CHAR ; // .9
+#define FP0_STR "&" // .0
+#define FP1_STR "^" // .1
+#define FP2_STR "}" // .2
+#define FP3_STR "{" // .3
+#define FP4_STR "|" // .4
+#define FP5_STR "`" // .5
+#define FP6_STR "<" // .6
+#define FP7_STR ">" // .7
+#define FP8_STR "_" // .8
+#define FP9_STR ";" // .9
 /** @} */
 
 /**
@@ -67,4 +59,15 @@ extern const unsigned int gbalatro_sys8Glyphs[192];
  */
 const char* get_font_point_str(int val);
 
+/**
+ * @brief Get the decimal point char equivalent of 0-9 from char param.
+ *
+ * @param digit_char A char of a digit between '0'-'9' to get '.0' to '.9' equivalents. Note that
+ *                   if a char outside of range is passed it the return value will be within limits
+ *                   but is not defined with any relationship to the input.
+ *
+ * @return A char representing a value in the font within the range of '.0' to '.9'
+ */
+char digit_char_to_font_point(char digit_char);
+
 #endif // FONT_H

include/gbalatro_sys8.h

@@ -0,0 +1,9 @@
+#ifndef GBALATRO_SYS8_FONT_H
+#define GBALATRO_SYS8_FONT_H
+
+#include <tonc.h>
+
+extern const TFont gbalatro_sys8Font;
+extern const unsigned int gbalatro_sys8Glyphs[192];
+
+#endif

source/font.c

@@ -1,22 +1,29 @@
 #include "font.h"
 
-#include "tonc.h"
+#include "util.h"
+
+#include <stdlib.h>
 
 static const char* s_font_point_lookup[] = {
-    XSTR(FP0_CHAR),
-    XSTR(FP1_CHAR),
-    XSTR(FP2_CHAR),
-    XSTR(FP3_CHAR),
-    XSTR(FP4_CHAR),
-    XSTR(FP5_CHAR),
-    XSTR(FP6_CHAR),
-    XSTR(FP7_CHAR),
-    XSTR(FP8_CHAR),
-    XSTR(FP9_CHAR),
+    FP0_STR,
+    FP1_STR,
+    FP2_STR,
+    FP3_STR,
+    FP4_STR,
+    FP5_STR,
+    FP6_STR,
+    FP7_STR,
+    FP8_STR,
+    FP9_STR,
 };
 
 const char* get_font_point_str(int val)
 {
-    val = ABS(val) % 10;
+    val = abs(val) % 10;
     return s_font_point_lookup[val];
 }
+
+char digit_char_to_font_point(char digit_char)
+{
+    return get_font_point_str(digit_char - '0')[0];
+}

source/game.c

@@ -118,6 +118,9 @@
 #define SHOP_BOTTOM_PANEL_BORDER_PID         26
 // Naming the stage where cards return from the discard pile to the deck "undiscard"
 
+/* This needs to stay a power of 2 and small enough
+ * for the lerping to be done before the next hand is drawn.
+ */
 #define NUM_SCORE_LERP_STEPS 32
 
 // Shop
@@ -2948,11 +2951,6 @@ static inline int hand_get_max_size(void)
     return hand_size;
 }
 
-// TODO: Help this comment find its way back to its variable
-/* This needs to stay a power of 2 and small enough
- * for the lerping to be done before the next hand is drawn.
- */
-
 static inline void game_playing_process_input_and_state(void)
 {
     if (hand_state == HAND_SELECT)
@@ -2998,10 +2996,11 @@ static inline void game_playing_process_input_and_state(void)
 
         if (lerped_temp_score > 0)
         {
-            display_temp_score(fx2uint(lerped_temp_score));
+            // Set the score display first because it's more important
+            // in case there isn't enough time within the frame to display both
+            display_score(fx2uint(lerped_score));
 
-            // We actually don't need to erase this because the score only increases
-            display_score(fx2uint(lerped_score)); // Set the score display
+            display_temp_score(fx2uint(lerped_temp_score));
         }
         else
         {

source/main.c

@@ -3,6 +3,7 @@
 #include "card.h"
 #include "font.h"
 #include "game.h"
+#include "gbalatro_sys8.h"
 #include "graphic_utils.h"
 #include "joker.h"
 #include "sprite.h"
@@ -33,7 +34,10 @@ void init()
         CLR_WHITE,
         TTE_BIT_UNPACK_OFFSET,
         &gbalatro_sys8Font,
-        NULL
+
+        // Explicitly use 8x8 tile text drawing function to improve performance
+        // See https://gbadev.net/tonc/tte.html#ssec-map-reg
+        se_drawg_w8h8
     );
     tte_erase_screen();
     tte_init_con();

source/util.c

@@ -1,8 +1,11 @@
 #include "util.h"
 
+#include "font.h"
+
 #include <limits.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <string.h>
 
 int int_arr_max(int int_arr[], int size)
 {
@@ -18,45 +21,153 @@ int int_arr_max(int int_arr[], int size)
     return max;
 }
 
+/**
+ * @brief Remove trailing zeros from a string.
+ *        Currently static single use, may be unstaticed if needed but use with caution.
+ *
+ * @param num_str The string to remove trailing zeros from, modified in-place.
+ * @param size The size of the string - strlen is not used and no checks are performed,
+ *             the function relies on the caller to provide the correct size,
+ *             if it's larger than the actual string length or negative it will result in
+ *             an invalid write.
+ */
+static inline void num_str_truncate_trailing_zeros(char* num_str, int size)
+{
+    while (size > 0 && num_str[size - 1] == '0')
+    {
+        size--;
+    }
+    num_str[size] = '\0';
+}
+
+/**
+ * @brief Build a truncated decimal remainder string.
+ *        Helper function for truncate_uint_to_suffixed_str()
+ *
+ * @param decimal_remainder Integer remainder (the `num % divisor`) used to
+ *        produce the fractional digits after the decimal point; formatted and
+ *        padded before truncation.
+ * @param truncated_num Integer part reduced by the divisor (`num / divisor`);
+ *        Used to compute how many fractional characters may be kept.
+ * @param num_req_chars Total character budget for the final string (truncated
+ *        number, fractional digits, and suffix).
+ *        Used to compute how many fractional characters may be kept.
+ * @param suffix_char One of 'K', 'M', or 'B' used for selecting the suffix scale and
+ *        padding width. If not one of the expected, the string may be incorrectly formatted.
+ * @param remainder_str Output buffer (size >= UINT_MAX_DIGITS + 1) where the
+ *        formatted fractional digits (including leading '.<digit>' special character) are written
+ *        as a NULL-terminated string; may be empty if nothing remains.
+ */
+static inline void truncate_num_get_remainder_string(
+    uint32_t decimal_remainder,
+    uint32_t truncated_num,
+    int num_req_chars,
+    char suffix_char,
+    char remainder_str[UINT_MAX_DIGITS + 1]
+)
+{
+    // Truncating the remainder in string form rather than number to avoid divisions
+    char* remainder_str_format;
+
+    switch (suffix_char)
+    {
+        // Pad with 0s to not lose leading zeros after decimal point
+        case 'B':
+            remainder_str_format = "%09lu";
+            break;
+        case 'M':
+            remainder_str_format = "%06lu";
+            break;
+        case 'K':
+            remainder_str_format = "%03lu";
+            break;
+        default:
+            // Should not reach here
+            remainder_str_format = "%lu";
+    }
+
+    snprintf(remainder_str, UINT_MAX_DIGITS + 1, remainder_str_format, decimal_remainder);
+
+    // Truncate overflow
+    int remaining_chars = num_req_chars - u32_get_digits(truncated_num) - 1; // - 1 for suffix
+
+    // If there is no room for any fractional characters, leave the remainder string empty.
+    if (remaining_chars <= 0)
+    {
+        remainder_str[0] = '\0';
+        return;
+    }
+
+    // Ensure we never write past the end of the buffer.
+    if (remaining_chars > UINT_MAX_DIGITS)
+    {
+        remaining_chars = UINT_MAX_DIGITS;
+    }
+    remainder_str[remaining_chars] = '\0';
+
+    num_str_truncate_trailing_zeros(remainder_str, remaining_chars);
+
+    if (remainder_str[0] != '\0')
+    {
+        remainder_str[0] = digit_char_to_font_point(remainder_str[0]);
+    }
+}
+
 void truncate_uint_to_suffixed_str(
     uint32_t num,
     int num_req_chars,
     char out_str_buff[UINT_MAX_DIGITS + 1]
 )
 {
-    bool inevitable_overflow = num_req_chars < SUFFIXED_NUM_MIN_REQ_CHARS;
-    if (inevitable_overflow)
-    {
-        num_req_chars = SUFFIXED_NUM_MIN_REQ_CHARS;
-    }
-
+    uint32_t truncated_num = num;
     int num_digits = u32_get_digits(num);
-    int overflow_size = num_digits - num_req_chars;
+    uint32_t decimal_remainder = 0;
+    bool overflow = num_digits > num_req_chars;
     char* suffix = "";
+    char remainder_str[UINT_MAX_DIGITS + 1];
+    remainder_str[0] = '\0';
 
-    /* If there is overflow, divide by the next suffixed power of 10
-     * to truncate the number back within num_req_chars.
-     * UINT32_MAX is in the billions so no need to check larger numbers
-     * or perform complex mathematical operations.
-     */
-    if (overflow_size >= ONE_M_ZEROS)
+    if (overflow)
     {
-        num /= ONE_B;
-        suffix = "B";
-    }
-    else if (overflow_size >= ONE_K_ZEROS)
-    {
-        num /= ONE_M;
-        suffix = "M";
-    }
-    else if (overflow_size > 0 || (inevitable_overflow && num_digits == SUFFIXED_NUM_MIN_REQ_CHARS))
-    // Special case - alleviate inevitable overflow for 1000s and truncate them to "1K"s
-    {
-        num /= ONE_K;
-        suffix = "K";
+        /* If there is overflow, divide by the next suffixed power of 10
+         * to truncate the number back within num_req_chars.
+         * UINT32_MAX is in the billions so no need to check larger numbers
+         * or perform complex mathematical operations.
+         */
+        uint32_t divisor = 1;
+        if (num >= ONE_B)
+        {
+            divisor = ONE_B;
+            suffix = "B";
+        }
+        else if (num >= ONE_M)
+        {
+            divisor = ONE_M;
+            suffix = "M";
+        }
+        else if (num >= ONE_K)
+        {
+            divisor = ONE_K;
+            suffix = "K";
+        }
+
+        // The compiler optimizes these into a single operation
+        truncated_num = num / divisor;
+        decimal_remainder = num % divisor;
     }
 
-    snprintf(out_str_buff, UINT_MAX_DIGITS + 1, "%lu%s", num, suffix);
+    if (suffix[0] != '\0' && decimal_remainder != 0)
+    {
+        truncate_num_get_remainder_string(
+            decimal_remainder,
+            truncated_num,
+            num_req_chars,
+            suffix[0],
+            remainder_str
+        );
+    }
+
+    snprintf(out_str_buff, UINT_MAX_DIGITS + 1, "%lu%s%s", truncated_num, remainder_str, suffix);
 }
 
 // Avoid uint overflow when add/multiplying score

tests/util/Makefile

@@ -3,7 +3,7 @@ CC := gcc
 CFLAGS := -I../../include -I. \
           -g -O3 -std=gnu23 -Wall -Werror -Wno-format
 
-SRC            := util_test.c ../../source/util.c
+SRC            := util_test.c ../../source/util.c ../../source/font.c
 OUT            := build/util_test 
 
 $(OUT): $(SRC) | build

tests/util/util_test.c

@@ -1,3 +1,4 @@
+#include <font.h>
 #include <util.h>
 #include <assert.h>
 #include <string.h>
@@ -25,6 +26,39 @@ void test_truncate_uint_to_suffixed_str()
     truncate_uint_to_suffixed_str(1000, 2, suffixed_str_buff);
     assert(strcmp(suffixed_str_buff, "1K") == 0);
 
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1000, 1, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1K") == 0);
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1000, 0, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1K") == 0);
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(0, 0, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "0") == 0);
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(100, 2, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "100") == 0);
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(100, 1, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "100") == 0);
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(123, 1, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "123") == 0);
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1234, 3, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP2_STR "K") == 0); // "1.2K"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1600, 3, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP6_STR "K") == 0); // "1.6K"
+
+
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(1000, 4, suffixed_str_buff);
     assert(strcmp(suffixed_str_buff, "1000") == 0);
@@ -35,7 +69,7 @@ void test_truncate_uint_to_suffixed_str()
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(12123, 4, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "12K") == 0);
+    assert(strcmp(suffixed_str_buff, "12" FP1_STR "K") == 0);   // "12.1K"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(123123, 4, suffixed_str_buff);
@@ -43,7 +77,7 @@ void test_truncate_uint_to_suffixed_str()
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(123123, 5, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "123K") == 0);
+    assert(strcmp(suffixed_str_buff, "123" FP1_STR "K") == 0);  // "123.1K"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(123123, 6, suffixed_str_buff);
@@ -55,19 +89,36 @@ void test_truncate_uint_to_suffixed_str()
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(12345123, 6, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "12345K") == 0);
+    assert(strcmp(suffixed_str_buff, "12" FP3_STR "45M") == 0); // "12.345M"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(12123123, 5, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "12M") == 0);
+    assert(strcmp(suffixed_str_buff, "12" FP1_STR "2M") == 0); // "12.12M"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1008000, 5, suffixed_str_buff);
+
+    assert(strcmp(suffixed_str_buff, "1" FP0_STR "08M") == 0); // "1.008M"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(3029000, 5, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "3" FP0_STR "29M") == 0); // "3.029M"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(10007000, 5, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "10M") == 0); // Decimal point fully truncated
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(10005123, 6, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "10" FP0_STR "05M") == 0); // "10.005M"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(12123123, 4, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "12M") == 0);
+    assert(strcmp(suffixed_str_buff, "12" FP1_STR "M") == 0); // "12.1M"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(54123123, 4, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "54M") == 0);
+    assert(strcmp(suffixed_str_buff, "54" FP1_STR "M") == 0); // "54.1M"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(123123123, 4, suffixed_str_buff);
@@ -75,27 +126,63 @@ void test_truncate_uint_to_suffixed_str()
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(123123123, 6, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "123M") == 0);
+    assert(strcmp(suffixed_str_buff, "123" FP1_STR "2M") == 0);  // "123.12M"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(987123123, 6, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "987M") == 0);
+    assert(strcmp(suffixed_str_buff, "987" FP1_STR "2M") == 0);  // "987.12M"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(123123123, 7, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "123123K") == 0);
+    assert(strcmp(suffixed_str_buff, "123" FP1_STR "23M") == 0); // "123.123M"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(123123123, 8, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "123" FP1_STR "231M") == 0); // "123.1231M"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(123123123, 9, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "123123123") == 0);
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(1123123123, 4, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "1B") == 0);
+    assert(strcmp(suffixed_str_buff, "1" FP1_STR "2B") == 0); // "1.12B"
 
     suffixed_str_buff[0] = '\0';
-    truncate_uint_to_suffixed_str((uint32_t)3123123123, 4, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "3B") == 0);
+    truncate_uint_to_suffixed_str((uint32_t)3012012012, 4, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "3" FP0_STR "1B") == 0); // "3.01B"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(1234123123, 5, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "1234M") == 0);
+    assert(strcmp(suffixed_str_buff, "1" FP2_STR "34B") == 0); // "1.234B"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1000512345, 6, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP0_STR "005B") == 0); // "1.0005B"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1234561234, 7, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP2_STR "3456B") == 0); // "1.23456B"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1000061234, 7, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP0_STR "0006B") == 0); // "1.00006B"
+    
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1234567123, 8, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP2_STR "34567B") == 0); // "1.234567B"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1000007123, 8, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP0_STR "00007B") == 0); // "1.000007B"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1234567812, 9, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP2_STR "345678B") == 0); // "1.2345678B"
+
+    suffixed_str_buff[0] = '\0';
+    truncate_uint_to_suffixed_str(1000000812, 9, suffixed_str_buff);
+    assert(strcmp(suffixed_str_buff, "1" FP0_STR "000008B") == 0); // "1.0000008B"
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(1123123123, 10, suffixed_str_buff);
@@ -111,12 +198,12 @@ void test_truncate_uint_to_suffixed_str()
 
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(UINT32_MAX, 4, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "4B") == 0);
+    assert(strcmp(suffixed_str_buff, "4" FP2_STR "9B") == 0); // "4.29B"
 
-    // This is the only test that checks rounding down, don't add any more
+    // This is one of the few tests that checks rounding down, try not to add many more
     suffixed_str_buff[0] = '\0';
     truncate_uint_to_suffixed_str(UINT32_MAX, 5, suffixed_str_buff);
-    assert(strcmp(suffixed_str_buff, "4294M") == 0);
+    assert(strcmp(suffixed_str_buff, "4" FP2_STR "94B") == 0); // "4.294B"
 
     char max_uint_str_buff[UINT_MAX_DIGITS + 1] = {'\0'};
     snprintf(max_uint_str_buff, sizeof(max_uint_str_buff), "%lu", UINT32_MAX);