[CHG] More protection to TTF functions

[NEW] Added FPS in the TTF example

GRRLIB/GRRLIB/GRRLIB_ttf.c

@@ -87,14 +87,19 @@ void  GRRLIB_FreeTTF (GRRLIB_ttfFont *myFont) {
  * @param color Text color in RGB format.
  */
 void GRRLIB_PrintfTTF(int x, int y, GRRLIB_ttfFont *myFont, const char *string, unsigned int fontSize, const u32 color) {
+    if(myFont == NULL || string == NULL)
+        return;
+
     size_t length = strlen(string) + 1;
     wchar_t *utf32 = (wchar_t*)malloc(length * sizeof(wchar_t));
-    utf32[length] = '\0';
+    if(utf32) {
-    mbstowcs(utf32, string, length);
+        length = mbstowcs(utf32, string, length);
-
+        if(length > 0) {
+            utf32[length] = L'\0';
             GRRLIB_PrintfTTFW(x, y, myFont, utf32, fontSize, color);
-
+        }
         free(utf32);
+    }
 }
 
 /**
@@ -108,6 +113,9 @@ void GRRLIB_PrintfTTF(int x, int y, GRRLIB_ttfFont *myFont, const char *string,
  * @param color Text color in RGB format.
  */
 void GRRLIB_PrintfTTFW(int x, int y, GRRLIB_ttfFont *myFont, const wchar_t *utf32, unsigned int fontSize, const u32 color) {
+    if(myFont == NULL || utf32 == NULL)
+        return;
+
     unsigned int loop;
     int penX = 0;
     int penY = fontSize;
@@ -177,14 +185,14 @@ static void DrawBitmap(FT_Bitmap *bitmap, int offset, int top, const u32 color)
  * @return The width of a text in pixel.
  */
 unsigned int GRRLIB_WidthTTF(GRRLIB_ttfFont *myFont, const char *string, unsigned int fontSize) {
-    if(string == NULL) {
+    if(myFont == NULL || string == NULL) {
         return 0;
     }
     unsigned int penX;
     size_t length = strlen(string) + 1;
     wchar_t *utf32 = (wchar_t*)malloc(length * sizeof(wchar_t));
-    utf32[length] = '\0';
     length = mbstowcs(utf32, string, length);
+    utf32[length] = L'\0';
 
     penX = GRRLIB_WidthTTFW(myFont, utf32, fontSize);
 
@@ -201,16 +209,16 @@ unsigned int GRRLIB_WidthTTF(GRRLIB_ttfFont *myFont, const char *string, unsigne
  * @return The width of a text in pixel.
  */
 unsigned int GRRLIB_WidthTTFW(GRRLIB_ttfFont *myFont, const wchar_t *utf32, unsigned int fontSize) {
+    if(myFont == NULL || utf32 == NULL) {
+        return 0;
+    }
+
     unsigned int loop;
     unsigned int penX = 0;
     FT_UInt glyphIndex;
     FT_UInt previousGlyph = 0;
     size_t length;
 
-    if(utf32 == NULL) {
-        return 0;
-    }
-
     if(FT_Set_Pixel_Sizes(myFont->face, 0, fontSize)) {
          FT_Set_Pixel_Sizes(myFont->face, 0, 12);
     }

examples/ttf/source/main.c

@@ -5,11 +5,18 @@
 
 #include <stdlib.h>
 #include <wiiuse/wpad.h>
+#include <ogc/lwp_watchdog.h>   // Needed for gettime and ticks_to_millisecs
 
 // Font
 #include "FreeMonoBold_ttf.h"
 
+// Prototype
+static u8 CalculateFrameRate();
+
 int main(int argc, char **argv) {
+    char FPS[255] = "";
+    bool ShowFPS = false;
+
     // Initialise the Graphics & Video subsystem
     GRRLIB_Init();
 
@@ -55,6 +62,11 @@ int main(int argc, char **argv) {
                          rand() % 0xFFFFFF);
         GRRLIB_Screen2Texture(0, 0, CopiedImg, false);
 
+        if(ShowFPS) {
+            sprintf(FPS, "Current FPS: %d", CalculateFrameRate());
+            GRRLIB_PrintfTTF(500+1, 25+1, myFont, FPS, 12, 0x000000);
+            GRRLIB_PrintfTTF(500, 25, myFont, FPS, 12, 0xFFFFFF);
+        }
         GRRLIB_Render();  // Render the frame buffer to the TV
 
         WPAD_ScanPads();  // Scan the Wii Remotes
@@ -65,6 +77,9 @@ int main(int argc, char **argv) {
         if (WPAD_ButtonsDown(0) & WPAD_BUTTON_A) {
             GRRLIB_Screen2Texture(0, 0, CopiedImg, false);
         }
+        if (WPAD_ButtonsDown(0) & WPAD_BUTTON_1) {
+            ShowFPS = !ShowFPS;
+        }
         if(WPAD_ButtonsHeld(0) & WPAD_BUTTON_1 && WPAD_ButtonsHeld(0) & WPAD_BUTTON_2) {
             WPAD_Rumble(0, true);  // Rumble on
             GRRLIB_ScrShot("sd:/grrlib_ttf.png"); // Needs to be after GRRLIB_Render()
@@ -78,3 +93,22 @@ int main(int argc, char **argv) {
 
     exit(0);  // Use exit() to exit a program, do not use 'return' from main()
 }
+
+/**
+ * This function calculates the number of frames we render each second.
+ * @return The number of frames per second.
+ */
+static u8 CalculateFrameRate() {
+    static u8 frameCount = 0;
+    static u32 lastTime;
+    static u8 FPS = 0;
+    u32 currentTime = ticks_to_millisecs(gettime());
+
+    frameCount++;
+    if(currentTime - lastTime > 1000) {
+        lastTime = currentTime;
+        FPS = frameCount;
+        frameCount = 0;
+    }
+    return FPS;
+}